JP2008139754A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an imaging apparatus capable of maintaining high-quality images, having less unevenness in the optical performance of the screen as a whole, even if the imaging surface of an imaging device is tilted, when the imaging device is moved. <P>SOLUTION: In the imaging apparatus having the imaging device and an optical system for forming an image on the imaging device, the imaging apparatus has a lens member, having refractive power and moving in an optical axis direction integrally with the imaging device within a distance of LD in the air-converted length from the imaging device, if the diagonal length of the effective screen of the imaging device is defined as LD. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a photographing apparatus such as a digital camera or a video camera lens using an image sensor.

  In recent years, in an imaging apparatus such as a digital camera or a video camera using an imaging element for image formation, it is required that the entire camera is compact and that a high-quality image can be obtained.

  For example, an imaging apparatus such as a digital camera is desired to be a thin (thin front-rear direction) compact camera that places importance on the portability of the photographer.

  Zoom lens barrels that use a retractable structure that is efficient in storing to reduce the thickness of the camera are known.

  On the other hand, there is known a variable magnification photographing apparatus in which an image pickup element is moved so as to follow an imaging position that fluctuates during zooming in order to simplify and compact the mechanism of a zoom lens (Patent Document 1).

  In addition, a camera is known in which a reflective member is provided in the optical system and a bending type optical system that deflects the optical axis by approximately 90 ° is used to reduce the optical thickness in the object side direction (front-rear direction) ( Patent Documents 2 and 3).

In addition, zoom lenses are known in which the image pickup device is moved along the image plane position during zooming in a bent zoom optical system to reduce the size of the entire optical system (Patent Documents 4 and 5).
Japanese Patent Laid-Open No. 06-284322 JP 2004-37967 A JP 2004-69808 A JP 2005-84151 A JP 2006-106071 A

  When the image pickup device is moved in the optical axis direction, the image pickup surface of the image pickup device must be moved at right angles to the optical axis in order to maintain good optical performance.

  When the image pickup device is moved, if the image pickup surface is inclined with respect to the optical axis, non-focusing uniformity (one-sided state) of the peripheral images facing each other when viewed from the center of the screen occurs, resulting in image quality deterioration.

  Conventionally, since the image pickup element is moved independently of the other lens groups, there is a tendency that when the image pickup surface falls down, the optical performance screen becomes non-uniform.

  It is an object of the present invention to provide an imaging apparatus that can maintain a high-quality image with little non-uniformity in the optical performance of the entire screen even when the imaging surface of the imaging element is tilted when the imaging element is moved. .

The imaging apparatus of the present invention is an imaging apparatus having an imaging element and an optical system that forms an image on the imaging element. When the diagonal length of the effective screen of the imaging element is LD,
Within a distance LD in air-converted length from the image sensor,
A lens member having a refractive power that moves in the optical axis direction integrally with the imaging element is provided.

In addition, the imaging device of the present invention is
In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes 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, which are disposed in order from the object side to the image side.
The third lens group includes a lens member having a positive refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The first lens group has a reflecting member for deflecting the optical axis,
The first lens group is stationary during zooming,
The second lens group moves to the object side,
The third lens group is characterized by moving integrally with the image sensor.

In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes 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 negative refractive power, which are arranged in order from the object side to the image side.
The third lens group includes a lens member having a negative refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The first lens group has a reflecting member for deflecting the optical axis,
The first lens group is stationary during zooming,
The second lens group moves to the object side,
The third lens group is characterized by moving integrally with the image sensor.

In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a positive lens having a positive refractive power arranged in order from the object side to the image side. Having a fourth lens group;
The fourth lens group includes a lens member having a positive refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The second lens group has a reflecting member for deflecting the optical axis,
The second lens group does not move during zooming,
The first lens group and the third lens group move to the object side,
The fourth lens group is characterized by moving integrally with the image sensor.

In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a third lens group having a negative refractive power, which are arranged in order from the object side to the image side. A fourth lens group, a fifth lens group having a positive refractive power,
The fifth lens group includes a lens member having a positive refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The second lens group has a reflecting member for deflecting the optical axis,
The second lens group does not move during zooming,
The first, third, and fourth lens groups move to the object side,
The fifth lens group is characterized by moving integrally with the image sensor.

  According to the present invention, it is possible to obtain an imaging apparatus that can maintain a high-quality image with little non-uniformity in the optical performance of the entire screen even when the imaging surface of the imaging element is tilted when the imaging element is moved.

  Embodiments of the image pickup apparatus of the present invention will be described below.

  1 and 2 are a lens cross-sectional view when the optical path of the zoom lens used in the image pickup apparatus of Embodiment 1 of the present invention is developed, and an optical path diagram when the optical path is bent.

  3, 4, and 5 are aberration diagrams of the zoom lens used in the image pickup apparatus of Embodiment 1 at the wide-angle end (痰 focal length end), the intermediate zoom position, and the telephoto end (long focal length end), respectively.

  6 and 7 are a sectional view of a zoom lens used in the image pickup apparatus according to Embodiment 2 of the present invention and an optical path diagram when the optical path is bent. FIGS. 8, 9, and 10 are aberration diagrams of the zoom lens used in the image pickup apparatus of Embodiment 2 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively.

  11 and 12 are a sectional view of a zoom lens used in the image pickup apparatus according to Embodiment 3 of the present invention and an optical path diagram when the optical path is bent. FIGS. 13, 14, and 15 are aberration diagrams of the zoom lens used in the image pickup apparatus of Embodiment 3 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively.

  16 and 17 are a sectional view of a zoom lens used in the image pickup apparatus according to the fourth embodiment of the present invention and an optical path diagram when the optical path is bent. 18, 19 and 20 are aberration diagrams of the zoom lens used in the image pickup apparatus of Embodiment 4 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively.

  21 and 22 are a sectional view of a zoom lens used in the image pickup apparatus according to Embodiment 5 of the present invention and an optical path diagram when the optical path is bent. 23, 24, and 25 are aberration diagrams of the zoom lens used in the image pickup apparatus of Embodiment 5 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively.

  26 and 27 are a sectional view of a zoom lens used in the image pickup apparatus according to Embodiment 6 of the present invention and an optical path diagram when the optical path is bent. 28, 29, and 30 are aberration diagrams at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively, of the zoom lens used in the image pickup apparatus of Embodiment 6.

  31 and 32 are a lens cross-sectional view of a zoom lens used in the image pickup apparatus according to Embodiment 7 of the present invention and an optical path diagram when the optical path is bent. 33, FIG. 34, and FIG. 35 are aberration diagrams of the zoom lens used in the image pickup apparatus of Example 7 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively.

  36 and 37 are a lens cross-sectional view of a zoom lens used in the image pickup apparatus according to Embodiment 8 of the present invention and an optical path diagram when the optical path is bent. FIGS. 38, 39, and 40 are aberration diagrams of the zoom lens used in the image pickup apparatus of Example 8 at the wide-angle end, the intermediate zoom position, and the telephoto end, respectively.

  In the optical path diagram, (A) represents the wide-angle end, (B) represents the intermediate zoom position, and (C) represents the telephoto end.

  FIG. 41 is an explanatory diagram when the imaging device according to the present invention falls from a plane orthogonal to the optical axis.

  FIG. 42 is a schematic view of the main part of a digital still camera (imaging device) according to the present invention.

  FIG. 43 is an explanatory diagram of the basic configuration of the optical system of the present invention.

  In the lens cross-sectional view and optical path diagram in which the optical path of the zoom lens of each embodiment is developed, the left side is the subject side (front), and the right side or the lower side is the image side (rear).

  When the zoom lens of each embodiment is used as an imaging device such as a projector, the left side is the screen and the right side or the left side is the projected image in the lens cross-sectional view and the optical path diagram in which the optical path is developed.

  In each embodiment, a zoom lens is used in the optical system used in the image pickup apparatus, but a photographic lens having a single focal length may be used.

  In FIG. 43, OB is an optical system and is housed in a lens barrel.

  The FF is a negative refracting power FF lens group disposed on the object side, and is fixed to the lens barrel. The FF lens group FF includes a lens unit FFN1 having a negative refractive power, a reflecting member PRZ that deflects the optical axis, for example, within a range of 80 ° to 100 °, and a lens unit FFN2 having a negative refractive power. ing.

  The FF lens group FF may not have the lens portion FFN2.

  FR is a first FR lens group having a positive or negative refractive power disposed on the most image side. The first FR lens group FR is a lens group that moves in the optical axis direction when the optical system is a zoom lens. The first FR lens group FR includes a lens portion FRF and a lens member LU having a positive or negative refractive power.

  The first FR lens group FR may not have the lens portion FRF.

  CP is an image sensor. M is a moving mechanism that moves the lens member LU and the image sensor CP in the direction of the optical axis integrally. Since the lens member, the image sensor, the filter, and the like move as described above, the expression “lens group (lens unit)” in this embodiment may include an image sensor.

  2, 7, 12, 17, 22, 27, 32, and 37, the image sensor CP is omitted in the lens cross-sectional views at the middle and the telephoto end.

  When the optical system OB is an imaging system with a single focal length and has a lens unit FRF, the first FF lens group FF and the FR lens group FR are separated by the widest air interval in the optical axis direction.

  In the lens cross-sectional view when the optical path of the zoom lens of each embodiment is developed, OB is a zoom lens (optical system).

  When i is the order of the lens groups from the object side, Li is the i-th lens group having positive or negative refractive power (optical power = reciprocal of focal length).

  PRZ is a prism (reflecting member) including a reflecting surface for bending an optical path.

  SP is an aperture stop (iris stop). LU is a lens member having a refractive power closest to the image sensor CP.

  F1 is an optical block corresponding to an optical filter, a face plate, a crystal low-pass filter, an infrared cut filter, or the like. IP is an image plane and corresponds to the imaging plane of a solid-state imaging element (photoelectric conversion element) CP such as a CCD sensor or a CMOS sensor.

  Reference numeral M denotes a moving mechanism that moves the lens member LU and the image sensor CP integrally.

  In the aberration diagrams, d and g are d-line and g-line, respectively. ΔM and ΔS are meridional image surfaces, sagittal image surfaces, and lateral chromatic aberration is represented by g-line. f is a focal length. Fno is an F number. Y is the image height.

  In each of the following embodiments, the wide-angle end and the telephoto end of the zoom lens are zoom positions when the zoom lens group is positioned at both ends of the movable range on the optical axis.

  The basic configuration of the optical system OB of the present invention shown in FIG. 43 will be described. In FIG. 43, the diagonal length of the effective screen of the image sensor CP is assumed to be LD. The lens member LU having the refractive power closest to the image side is disposed within a distance of 1.5 × LD in terms of air length from the image sensor CP.

In Examples 1 to 8, the length LD of the diagonal length of the effective region of the image sensor is 7.1 mm. In each embodiment, the air conversion length (back conversion air conversion length) of the distance between the refraction lens (lens having power) closest to the image pickup element and the image pickup element is as follows.
Example 1 2.4 mm
Example 2 3.1 mm
Example 3 3.2 mm
Example 4 2.6 mm
Example 5 3.5 mm
Example 6 3.4 mm
Example 7 3.0 mm
Example 8 4.5mm
Here, the distance between the image sensor and the refractive lens (refractive surface) closest to the image sensor is 1.5 times or less, preferably LD or less, more preferably 0.5 times the diagonal length LD of the effective area of the image sensor. It is desirable that it is 7 × LD or less.

Here, the air equivalent length OD is the length in air. For example, when a glass block is arranged in the optical path, the air equivalent length OD of the glass block is as follows. When the refractive index of the material is n and the thickness in the optical axis direction is D,
OD = D / n
It is.

  The lens member LU having the refractive power closest to the image side is moved integrally with the image sensor CP by the moving mechanism M.

  As a result, even if the image sensor CP is tilted with respect to the optical axis, the occurrence of one-sided blurring of the image obtained by the image sensor CP is reduced.

  Next, in the optical system OB shown in FIG. 43, the optical action when the lens member LU and the image pickup element CP are integrally moved and tilted with respect to the optical axis will be described with reference to FIG.

  In FIG. 41, it is assumed that the optical system OB is composed of a positive lens A and a positive lens B in order from the object side to the image side for convenience, and is composed of a single focal length.

  In FIG. 41A, the positive lenses A and B are not decentered with respect to the optical axis La. It is the schematic of the optical system in a non-decentered state.

  FIG. 41A shows optical paths of light rays that are formed at two image heights in the vertical direction of the imaging surface using the ideal optical system in which the positive lenses A and B are assembled as designed.

  In the figure, a positive lens (A) is obtained by combining the positive lens (B) disposed closest to the image sensor CP in the image plane side and the combined refractive power excluding the positive lens (A) from the entire optical system. ).

  FIG. 41B shows a case where only the image sensor CP is tilted with respect to the optical axis La. In FIG. 41B, the upper image height is the front focus state and the lower image height is the rear focus state. Furthermore, since the light beam is obliquely reflected with respect to the image plane, the beam spot diameter increases, and at the same time, the lateral aberration of the image height in the vertical direction becomes asymmetric.

  FIG. 41C shows the case where the image sensor CP and the positive lens B closest to the image are integrally tilted with respect to the optical axis La.

  Here, when light rays incident on two image heights in the vertical direction are incident on the positive lens (B), the incident angle on the positive lens (B) is higher than that in the non-eccentric state of FIG. The light ray incident on the image height (upper ray) changes so that the light ray incident on the lower image height (lower ray) becomes loose.

  Therefore, the light beam passing through the positive lens (B) is strongly refracted in the optical axis direction because the upper light beam has a positive refracting action, while the lower light beam has the opposite effect.

  Therefore, a change in the refraction action of the upper and lower light rays occurs according to the tilt direction of the imaging surface. For this reason, in FIG.41 (C), the effect | action which suppresses the image change shown to FIG.41 (B) when only an imaging surface falls is produced. As a result, the amount of lateral aberration generated is smaller than that in FIG. 41B as shown in FIG.

  Note that the refractive power arrangement of the optical system OB is not limited to the order of the positive lens A and the positive lens B. The order may be negative lens and positive lens. Moreover, a positive lens and a negative lens may be sufficient.

  Features common to the embodiments will be described with reference to FIG.

  In FIG. 43, when the lens member LU is composed of a lens having a positive refractive power, the focal length of the lens member LU having a positive refractive power is PFL. The focal length of the optical system OB is FW.

  Here, when the optical system OB is a single focal length, the focal length FW is focused on an object at infinity, and when the optical system OB is a zoom lens, it is focused on an object at infinity at the wide angle end. Is the focal length.

At this time, 0.15 <Fw / PFL <0.55 (1)
Is satisfied.

  When the upper limit of conditional expression (1) is exceeded, the refractive power of the lens member LU having a positive refractive power becomes too strong, and the exit pupil diameter tends to increase. For this reason, in order to obtain a constant peripheral light amount, the lens outer diameter of the lens member LU having a positive refractive power must be increased, and at the same time, off-axis aberrations are greatly generated, which is not preferable.

  On the other hand, if the lower limit is exceeded, the refractive power of the lens member LU having a positive refractive power becomes too weak, and the effect of correcting the image degradation due to one blur is weakened.

  In FIG. 43, when the lens member LU is made of a lens having a negative refractive power, at least one surface of the lens having a negative refractive power has an aspherical shape.

  As a result, the same effect as that obtained by the conditional expression (1) is obtained.

  The focal length of the FF lens group FF is assumed to be FFW. When the optical system is a zoom lens and the lens unit FFa that moves during zooming is arranged closer to the object side than the FF lens unit FF, the lens unit FFa and the FF lens unit FF at the wide angle end are arranged. The combined focal length of the front group is assumed to be FFW.

The focal length of the first FR lens group FR is FRW. When the optical system is a zoom lens, the combined focal length at the wide-angle end of all lens groups (rear group) arranged on the image side of the FF lens group FF is FRW. At this time, 0.25 <| Fw / FFw | <0.6 (provided that FFw <0) (2)
0.25 <Fw / FRw <0.9 (3)
Is satisfied.

  Conditional expression (2) relates to the ratio between the focal length at the wide-angle end and the combined focal length of the front group to the first FF lens group FF having the reflecting member at the wide-angle end or the lens group on the object side including the same. This is a condition for obtaining a good image quality while reducing the diameter.

  When the upper limit value of conditional expression (2) is exceeded, the negative refractive power of the front group becomes strong, so that a large amount of positive spherical aberration occurs and it is difficult to correct it.

  On the other hand, when the lower limit is exceeded, the retrofocus action of the entire optical system becomes weak. For this reason, the back focus becomes too short, and it becomes impossible to arrange a low-pass filter or a filter such as infrared absorption inserted in the space between the imaging element surface and the first FR lens group FR closest to the image plane.

  Also, since the off-axis ray aberration is greatly generated as the lens diameter of the first FR lens group FR is increased, it is not good.

  Conditional expression (3) relates to the ratio between the focal length at the wide-angle end and the combined focal length of the rear group of all the lens units on the image plane side of the first FF lens unit FF having the reflecting member at the wide-angle end.

  If the upper limit value of conditional expression (3) is exceeded, the positive refractive action of the rear group becomes too large, and high-order spherical aberration and coma aberration occur greatly, making it difficult to correct them.

  On the other hand, if the lower limit is exceeded, the amount of movement of the first FR lens group FR becomes large in order to ensure a certain zoom range, and the total length of the optical system increases, which is not good.

  In each embodiment, in order to further improve image quality, the following configuration is preferable.

  In order to achieve a compact and high-performance optical system while reducing the number of lenses, it is effective to introduce at least one aspherical surface into the lens group on the image plane side of the FF lens group FF having the reflecting member PRZ. It is. Accordingly, it becomes easy to satisfactorily correct the spherical aberration generated in the FF lens group FF.

  Further, the aspherical lens at this time may use a composite aspherical surface (replica aspherical surface) in order to expand the types of glass that can be used in consideration of productivity.

  Furthermore, the aspheric lens may be a plastic material.

  In addition, a diffractive optical element or a refractive distribution optical material may be introduced. This facilitates improvement of optical performance.

  When the iris diaphragm SP is moved along the optical axis independently of each lens group during zooming, the change in the entrance pupil position can be reduced. In order to simplify the mechanism, the optical axis may be fixed during zooming.

  In order to correct image blur due to camera shake that causes image quality degradation during shooting, a lens group or a part of the lens group may be decentered. By changing the deflection angle or the deflection direction by rotating or moving the reflecting member PRZ, an image position displacement action that cancels the image blur at the time of photographing may be provided.

  Further, it is desirable to perform the focusing action on an object at a finite distance by moving the image sensor or a lens group including the image sensor on the optical axis. You may carry out by moving lens groups other than the FF lens group which has reflection member PRZ on an optical axis.

  When the optical system of this embodiment is used as a zoom lens, the following settings are made.

  The first FF lens group FF in which the reflecting member PRZ is disposed during zooming is fixed on the optical axis, and the lens member LU and the image sensor CP are integrated with each other, or the FR lens group FR and the image sensor CP are integrated with the optical axis. The movement of the image plane position is corrected by moving it.

  The effect of correcting the fluctuation of the image plane position that occurs during zooming is achieved by moving the image sensor along the optical axis.

  The reflecting member PRZ is provided in the first FF lens group having a negative refractive power and disposed closer to the object side than the shutter or iris diaphragm position. Further, a negative lens is disposed on the object side of the reflecting member PRZ.

  The lens group disposed at the pupil or iris stop position has an optical path such that off-axis light intersects the optical axis at the pupil position. For this reason, the off-axis light beam that has passed through the negative lens disposed on the object side of the reflecting member PRZ gives a refracting action that is nearly parallel to the optical axis.

  By providing a space for inserting the reflecting member on the image plane side, it is possible to reduce the space necessary for inserting the reflecting member while preventing the pupil position from fluctuating and changing the optical characteristics. it can.

  The negative refracting power FF lens group FF having a reflecting member is a lens group having the strongest negative refracting power in the optical system.

  The reason is that if the lens unit with the negative refractive power, which has the strongest refractive power, is moved, the correction of the image plane position can be achieved with a small amount of movement of the correction lens group, so that the optical system can be downsized. It is effective against.

  In each embodiment, the FF lens group FF is fixed to the optical axis. Accordingly, since the change in the image plane position is a relative change amount between the lens group for image plane position correction and the image sensor, the amount of movement for the image sensor to correct the image plane can be reduced.

  As described above, in each embodiment, the reflecting member is arranged as a lens group that satisfies the above-described condition in the first FF lens group FF having the negative refractive power arranged on the most object side.

  In order to give the optical system a further high zooming effect, a positive refractive power that moves toward the object side during zooming from the wide-angle end to the telephoto end on the object side of the FF lens group FF having the reflecting member. Lens group FFa is arranged. At this time, when zooming from the wide-angle end to the telephoto side, the combined refractive power of the FFa lens group and the FF lens group is changed to the long focal point side by increasing the air gap between the FFa lens group and the FF lens group. ing. This is particularly advantageous when expanding the zooming range to the telephoto side.

  Next, Examples 1 to 8 will be described.

  In Examples 1, 3, 5, and 6 of FIGS. 1, 11, 21, and 26, the optical system OB includes a first lens unit L1 having a negative refractive power disposed in order from the object side to the image side, and a positive lens unit L1. The second lens unit L2 has a refractive power and the third lens unit L3 has a positive refractive power.

  The third lens unit L3 includes a lens member LU having a positive refractive power within a distance LD as an air-converted length from the image sensor CP, where LD is the diagonal length of the effective screen of the image sensor CP.

  The first lens unit L1 includes a reflecting member PRZ that deflects the optical axis within a range of 80 ° to 100 °.

  During zooming, the first lens unit L1 does not move.

  The second lens unit L2 moves to the object side.

  The third lens unit L3 moves integrally with the image sensor CP.

  Here, the relationship between the lens groups L1 to L3 and the first FF lens group FF and the FR lens member LU shown in FIG. 43 is as shown in Table-1.

  The conditional expressions (1) to (3) described above are as follows for Examples 1, 3, 5, and 6.

  The focal length of the lens member LU is PFL.

Let FW be the focal length of the entire system at the wide-angle end. At this time, 0.15 <Fw / PFL <0.55
Is satisfied.

The focal length of the first lens unit L1 is FFW. The combined focal length of the second and third lens units L2 and L3 at the wide angle end is defined as FRW. At this time, 0.25 <| Fw / FFw | <0.6 (provided that FFw <0) (2)
0.25 <Fw / FRw <0.9 (3)
Is satisfied.

  In Example 7 of FIG. 31, the optical system OB includes a first lens unit L1 having a negative refractive power, a second lens unit L2 having a positive refractive power, and a first lens unit having a negative refractive power, which are arranged in order from the object side to the image side. It consists of three lens units L3.

  The third lens unit L3 includes a lens member LU having a negative refractive power within a distance LD from the image sensor CP as an air equivalent length when the diagonal length of the effective screen of the image sensor CP is LD.

  The first lens unit L1 includes a reflecting member PRZ that deflects the optical axis within a range of 80 ° to 100 °.

  During zooming, the first lens unit L1 does not move.

  The second lens unit L2 moves to the object side.

  The third lens unit L3 moves integrally with the image sensor CP.

  Here, the relationship between the lens groups L1 to L3 and the first FF lens group FF and the FR lens member LU shown in FIG. 43 is as shown in Table-1.

  The conditional expressions (2) and (3) described above are as follows for the seventh embodiment.

The focal length of the first lens unit L1 is FFW. The combined focal length of the second and third lens units L2 and L3 at the wide angle end is defined as FRW. At this time, 0.25 <| Fw / FFw | <0.6 (provided that FFw <0) (2)
0.25 <Fw / FRw <0.9 (3)
Is satisfied.

  In Example 2 of FIG. 6, the optical system OB includes a first lens unit L1 having a positive refractive power, a second lens unit L2 having a negative refractive power, and a first lens unit having a positive refractive power, which are arranged in order from the object side to the image side. The third lens unit L3 includes a third lens unit L3 and a fourth lens unit L4 having a positive refractive power.

  The fourth lens unit L4 includes a lens member LU having a positive refractive power within a distance LD as an air-converted length from the image sensor CP, where LD is the diagonal length of the effective screen of the image sensor CP.

  The second lens unit L2 includes a reflecting member PRZ that deflects the optical axis within a range of 80 ° to 100 °.

  During zooming, the second lens unit L2 does not move.

  The first lens unit L1 and the third lens unit L3 move to the object side.

  The fourth lens unit L4 moves integrally with the image sensor CP.

  Here, the relationship between the lens groups L1 to L4 and the FF lens group FF and the FR lens member LU shown in FIG. 43 is as shown in Table-1.

  The conditional expressions (1) to (3) described above are as follows in the second embodiment.

  The focal length of the lens member LU is PFL.

Let FW be the focal length of the entire system at the wide-angle end. At this time, 0.15 <Fw / PFL <0.55 (1)
Is satisfied.

The combined focal length of the first and second lens units L1 and L2 at the wide angle end is defined as FFW. The combined focal length of the third and fourth lens units L3 and L4 at the wide angle end is defined as FRW. At this time, 0.25 <| Fw / FFw | <0.6 (however, FFw <0) (2)
0.25 <Fw / FRw <0.9 (3)
Is satisfied.

  In Examples 4 and 8 of FIGS. 16 and 36, the optical system OB includes a first lens unit L1 having a positive refractive power and a second lens unit L2 having a negative refractive power, which are arranged in order from the object side to the image side. The third lens unit L3 has a positive refractive power, the fourth lens unit L4 has a negative refractive power, and the fifth lens unit L5 has a positive refractive power.

  The fifth lens unit L5 includes a lens member LU having a positive refractive power within a distance LD as an air-converted length from the image sensor CP, where LD is the diagonal length of the effective screen of the image sensor CP.

  The second lens unit L2 includes a reflecting member PRZ that deflects the optical axis within a range of 80 ° to 100 °.

  During zooming, the second lens unit L2 does not move.

  The first, third, and fourth lens groups L1, L3, and L4 move to the object side.

  The fifth lens unit L5 moves integrally with the image sensor CP.

  Here, the relationship between each of the lens groups L1 to L5 and the FF lens group FF and the FR lens member LU shown in FIG. 43 is as shown in Table-1.

  The conditional expressions (1) to (3) described above are as follows in the fourth and eighth embodiments.

  The focal length of the lens member LU is PFL.

  Let FW be the focal length of the entire system at the wide-angle end.

0.15 <Fw / PFL <0.55 (1)
Is satisfied.

The combined focal length of the first and second lens units L1 and L2 at the wide angle end is defined as FFW. The combined focal length of the third, fourth, and fifth lens units L3, L4, and L5 at the wide angle end is defined as FRW. At this time, 0.25 <| Fw / FFw | <0.6 (however, FFw <0) (2)
0.25 <Fw / FRw <0.9 (3)
Is satisfied.

  Next, a specific configuration of the optical system in each embodiment will be described.

  The optical system OB of Embodiment 1 shown in FIGS. 1 and 2 is a zoom optical system (zoom lens) having a three-group configuration.

  In the first embodiment, the first lens unit L1 having a negative refractive power having the reflecting member PRZ in order from the object side to the image side, the second lens unit L2 having a positive refractive power, a lens and a filter having a positive refractive power The third lens unit L3 is formed by integrating the class F1 and the like.

  The first lens unit L1 does not move during zooming from the wide-angle end to the telephoto end. Then, the second lens unit L2 moves to the object side so that the air gap between the first and second lens units L1 and L2 is narrowed. The third lens unit L3 and the image sensor CP are integrally moved on the optical axis by the moving mechanism M so that the position of the image plane that fluctuates accordingly coincides with the image sensor surface of the image sensor CP.

  In the optical system of the present embodiment, the displacement action of the image plane position (anti-vibration action) by moving the positive lens in the second lens group L2 or the third lens group L3 so as to have a component perpendicular to the optical axis direction. Therefore, image blur due to camera shake may be corrected.

  Example 2 in FIGS. 6 and 7 is a zoom optical system having a wide field angle and a four-group configuration having a high zoom ratio and a high zoom ratio.

  In the second exemplary embodiment, the first lens unit L1 including a positive single lens in order from the object side to the image side, the second lens unit L2 having a negative refractive power having the reflecting member PRZ, and the positive refractive power. It has the 3rd lens group L3.

  Further, it is composed of a fourth lens unit L4 in which a lens having a positive refractive power and a filter F1 are integrated.

  During zooming from the wide-angle end to the telephoto end, the second lens unit L2 does not move. The first lens unit L1 moves to the object side. The third lens unit L3 moves to the object side so that the air gap between the second and third lens units L2 and L3 is narrowed. The fourth lens group L4 and the image sensor CP are integrally moved by the moving mechanism M so that the image plane position that fluctuates accordingly coincides with the image sensor surface of the image sensor CP.

  In the optical system of Example 2, the positive lens in the third lens unit L3 or the fourth lens unit L4 moves so as to have a component in a direction perpendicular to the optical axis direction, thereby causing an image plane position displacement action. Image blur due to camera shake may be corrected.

  The third embodiment shown in FIGS. 11 and 12 is a zoom optical system having a three-group configuration having a super wide field angle and a high zoom ratio. In the third embodiment, the reflecting member PRZ is disposed in the first lens unit L1 because the photographing apparatus is thin.

  In the third embodiment, in order from the object side to the image side, the first lens unit L1 having a negative refractive power having the reflecting member PRZ, the second lens unit L2 having a positive refractive power, and a lens having a positive refractive power as a whole. The lens unit includes a third lens unit L3 in which the group and the filter group F1 are integrated.

  The first lens unit L1 does not move during zooming from the wide-angle end to the telephoto end. The second lens unit L2 moves toward the object side so that the air gap between the first and second lens units L1 and L2 is narrowed. The third lens group L3 and the image sensor CP are moved together by the moving mechanism M so that the position of the image plane that fluctuates accordingly coincides with the image sensor surface of the image sensor CP.

  In the optical system of the third embodiment, the positive lens in the second lens unit L2 or the third lens unit L3 moves so as to have a component in the direction perpendicular to the optical axis direction. Image blur due to blur may be corrected.

  The fourth embodiment shown in FIGS. 16 and 17 is a zoom optical system having a wide field angle and a five-group configuration with an ultra-high zoom ratio.

  In Example 4, in order from the object side to the image side, a first lens unit L1 having a positive refractive power having a negative lens and a plurality of positive lenses, a second lens unit L2 having a negative refractive power having a reflecting member, and a positive lens unit. The third lens unit L3 having the refractive power of Further, the lens unit includes a fourth lens unit L4 having a negative refractive power, a fifth lens unit L5 in which a lens having a positive refractive power and a filter group F1 are integrated.

  During zooming from the wide-angle end to the telephoto end, the second lens unit L2 does not move. The first lens unit L1 moves to the object side. The third lens unit L3 moves to the object side so that the air gap between the second and third lens units L2 and L3 is narrowed. The fourth lens group moves along the optical axis so as to correct various aberrations, and the fifth lens group L5 and the image sensor CP are integrated so that the image plane position that fluctuates accordingly coincides with the image sensor surface. Thus, the optical axis is moved by the moving mechanism M.

  In the optical system of the fourth embodiment, the positive lens in the third lens unit L3 or the fifth lens unit L5 moves so as to have a component in the direction perpendicular to the optical axis direction. Image blur due to blur may be corrected.

  The fifth embodiment shown in FIGS. 21 and 22 is a zoom optical system having a three-group configuration having a wide field angle and a high zoom ratio. In the fifth embodiment, the reflecting member PRZ is disposed in the first lens unit L1 because the photographing apparatus is thin.

  In Example 5, in order from the object side to the image side, the first lens unit L1 having the negative refractive power having the reflecting member PRZ, the second lens unit L2 having the positive refractive power, and the lens having the positive refractive power as a whole. The third lens unit L3 is formed by integrating the lens unit and the filter group F1.

  The first lens unit L1 has a configuration in which a positive lens and a negative lens are arranged from the object side, and particularly corrects distortion and lateral chromatic aberration in a wide angle region.

  During zooming from the wide-angle end to the telephoto end, the first lens unit L1 does not move. The second lens unit L2 moves to the object side so that the air gap between the first and second lens units L1 and L2 is narrowed. The third lens group L3 and the image sensor CP are moved together by the moving mechanism M so that the position of the image plane that fluctuates accordingly coincides with the image sensor surface of the image sensor CP.

  In the optical system of the fifth embodiment, the second lens unit L2 or the negative or positive lens in the third lens unit L3 moves so as to have a component in the direction perpendicular to the optical axis direction. The image blur caused by the camera shake may be corrected.

  Example 6 of FIGS. 26 and 27 is a zoom optical system having a three-group configuration with a wide field angle and a high zoom ratio. In the sixth embodiment, the reflecting member PRZ is disposed in the first lens unit L1 because the photographing apparatus is thin.

  In Example 6, in order from the object side to the image side, the first lens unit L1 having the negative refractive power having the reflecting member PRZ, the second lens unit L2 having the positive refractive power, and the lens unit having the positive refractive power as a whole. And a filter F1 are integrated into a third lens unit L3.

  The first lens unit L1 does not move during zooming from the wide-angle end to the telephoto end.

  The second lens unit L2 moves to the object side so that the air gap between the first and second lens units L1 and L2 is narrowed. The third lens group L3 and the image sensor CP are moved together by the moving mechanism M so that the position of the image plane that fluctuates accordingly coincides with the image sensor surface of the image sensor CP.

  In the optical system according to the sixth exemplary embodiment, the negative or positive lens in the second lens unit L2 or the third lens unit L3 moves so as to have a component in the direction perpendicular to the optical axis direction, thereby causing a displacement effect on the image plane position. Image blur due to camera shake may be corrected.

  Example 7 in FIGS. 31 and 32 is a zoom optical system having a three-group configuration.

  The seventh embodiment includes, in order from the object side to the image side, a first lens unit L1 having a negative refracting power and a second lens unit L2 having a positive refracting power and having a reflecting member PRZ. Further, the third lens unit L3 includes an aspheric surface, and a negative lens made of a resin material and a filter F1 are integrated.

  During zooming from the wide-angle end to the telephoto end, the first lens unit L1 does not move. The second lens unit L2 moves toward the object side so that the air gap between the first and second lens units L1 and L2 is narrowed. The third lens group L3 and the image sensor CP are moved together by the moving mechanism M so that the position of the image plane that fluctuates accordingly coincides with the image sensor surface of the image sensor CP.

  In the optical system of Example 7, the negative lens in the second lens unit L2 or the third lens unit L3 moves so as to have a component in the direction perpendicular to the optical axis direction, thereby causing a displacement action of the image plane position. Image blur due to blur may be corrected.

  The eighth embodiment shown in FIGS. 36 and 37 is a zoom optical system having a wide field angle and a five-group configuration with a high zoom ratio.

  In Example 8, in order from the object side to the image side, a first lens unit L1 having a positive refractive power having a negative lens and a positive lens, a second lens unit L2 having a negative refractive power having a reflecting member PRZ, and a positive refraction. The third lens unit L3 having power is configured. Further, the lens unit includes a fourth lens unit L4 having a negative refractive power, a fifth lens unit L5 in which a lens having a positive refractive power and a filter group F1 are integrated.

  During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves to the object side. The second lens unit L2 is stationary. The third lens unit L3 moves to the object side so that the air gap between the second and third lens units L2 and L3 is narrowed. The fourth lens unit L4 moves so as to correct various aberrations. The fifth lens unit L5 and the image sensor CP are integrally moved by the moving mechanism M so that the image plane position that varies accordingly coincides with the image sensor surface of the image sensor CP.

  In the optical system of Example 8, the positive lens in the third lens unit L3 or the fifth lens unit L5 moves so as to have a component in the direction perpendicular to the optical axis direction, thereby causing a displacement effect of the image plane position. The image blur due to may be corrected.

  In each embodiment, focusing is performed by moving a lens group other than the lens group having the reflecting member PR.

  The focusing may be performed by a floating method in which a plurality of lens groups are combined and moved.

  In each embodiment, a prism is used as the reflecting member to deflect the optical axis, but a reflecting mirror may be used instead of the prism.

  A mechanism for moving the image sensor in the direction perpendicular to the optical axis direction may be used to correct image blur due to camera shake.

  The optical system is not limited to a zoom lens, and may be a photographing lens having a single focal length. The focal length at this time corresponds to the focal length at the wide angle end of the zoom lens.

  According to each embodiment, it is possible to suppress image degradation due to one-sided blur caused by the tilting of the image sensor accompanying the movement of the image sensor CP.

  Next, numerical examples of the present invention will be shown. In each numerical example, i indicates the order of the surfaces from the object side, Ri is the radius of curvature of each surface, Di is the distance between the i-th surface and the (i + 1) -th surface, and Ni and νi are based on the d-line, respectively. Represents the refractive index and Abbe number.

The two surfaces closest to the image are optical blocks LP. In addition, when the aspherical shape is x with the displacement in the optical axis direction at the position of the height h from the optical axis as the reference to the surface vertex,
x = (h ² / R) / [1+ {1− (1 + k) (h / R) ² } ^1/2 ]
+ Ah ² + Bh ⁴ + Ch ⁶ + Dh ⁸ + Eh ¹⁰
It is represented by Here, k is a conic constant, A, B, C, D, and E are aspheric surface numbers, and R is a paraxial radius of curvature.

“E-0X” means “× 10 ^−x ”. f represents a focal length, Fno represents an F number, and ω represents a half angle of view. Table 2 shows the relationship between the above-described conditional expressions and numerical examples.

Numerical example 1
f = 6.31 to 10.56 Fno = 3.55 to 4.53 2ω = 58.7 ° to 37.2 °

R 1 = 13.345 D 1 = 1.00 N 1 = 1.69680 ν 1 = 55.5
R 2 = 8.327 D 2 = 3.41
R 3 = ∞ D 3 = 12.00 N 2 = 1.77250 ν 2 = 49.6
R 4 = ∞ D 4 = 0.72
R 5 = -13.225 D 5 = 1.50 N 3 = 1.84666 ν 3 = 23.9
R 6 = -11.139 D 6 = 0.70 N 4 = 1.48749 ν 4 = 70.2
R 7 = 225.227 D 7 = Variable

R 8 = Aperture D 8 = 0.30
* R 9 = 4.545 D 9 = 2.20 N 5 = 1.74320 ν 5 = 49.3
* R10 = -12.519 D10 = 0.30
R11 = -10.045 D11 = 1.00 N 6 = 1.69895 ν 6 = 30.1
R12 = 4.176 D12 = 0.20
R13 = 7.146 D13 = 2.00 N 7 = 1.69680 ν 7 = 55.5
R14 = 131.113 D14 = variable

R15 = 11.679 D15 = 1.50 N 8 = 1.48749 ν 8 = 70.2
R16 = 27.893 D16 = 1.00
R17 = ∞ D17 = 1.25 N 9 = 1.51633 ν 9 = 64.1
R18 = ∞


\ Focal length 6.31 8.97 10.56
Variable interval \
D 7 8.34 2.94 1.00
D14 5.00 6.85 7.95


Aspheric coefficient

Surface 9: K = -6.664966e-002 A = 0.00000e + 000 B = 1.74069e-004
C = 4.67119e-004 D = -1.47826e-004 E = 2.16085e-005

10th page: K = 4.27738e + 000 A = 0.00000e + 000 B = 2.59427e-003
C = 1.36497e-004 D = -1.57732e-005 E = 1.27714e-005


Numerical example 2
f = 4.72 to 17.31 Fno = 2.51 to 4.50 2ω = 73.9 ° to 23.2 °

R 1 = 15.565 D 1 = 5.20 N 1 = 1.48749 ν 1 = 70.2
R 2 = 209.071 D 2 = Variable

* R 3 = -50.484 D 3 = 1.00 N 2 = 1.85961 ν 2 = 40.3
R 4 = 9.037 D 4 = 2.56
R5 = ∞ D5 = 8.00 N3 = 1.77250 ν3 = 49.6
R 6 = ∞ D 6 = 0.95
R 7 = -15.718 D 7 = 0.50 N 4 = 1.83481 ν 4 = 42.7
R 8 = 9.917 D 8 = 0.46
R 9 = 11.851 D 9 = 1.90 N 5 = 1.84666 ν 5 = 23.9
R10 = -24.411 D10 = variable

R11 = Aperture D11 = 0.50
* R12 = 5.968 D12 = 1.70 N 6 = 1.69350 ν 6 = 53.2
R13 = -26.051 D13 = 0.12
R14 = 6.415 D14 = 1.60 N 7 = 1.69680 ν 7 = 55.5
R15 = 182.351 D15 = 0.50 N8 = 1.84666 ν8 = 23.9
R16 = 3.502 D16 = variable

* R17 = 10.689 D17 = 2.00 N 9 = 1.73077 ν 9 = 40.5
R18 = -34.695 D18 = 1.50
R19 = ∞ D19 = 1.25 N10 = 1.51633 ν10 = 64.1
R20 = ∞


\ Focal length 4.72 13.54 17.31
Variable interval \
D 2 0.90 5.89 6.71
D10 11.50 2.07 0.63
D16 6.87 15.45 18.83


Aspheric coefficient

Third side: K = -4.23949e + 001 A = 0.000000 + 000 B = 1.42820e-004
C = -1.19268e-006 D = 5.47717e-009 E = -2.94385e-012

Surface 12: K = -2.05313e + 000 A = 0.000000 + 000 B = 5.58921e-004
C = 7.98734e-006 D = -3.86674e-006 E = 2.43428e-007

17th page: K = 5.46772e-001 A = 0.00000e + 000 B = -2.72057e-004
C = 7.02856e-006 D = -6.64417e-007 E = 1.37919e-008


Numerical Example 3
f = 4.06 to 15.94 Fno = 3.17 to 6.30 2ω = 82.3 ° to 25.1 °

R 1 = 34.663 D 1 = 1.50 N 1 = 1.88300 ν 1 = 40.8
R 2 = 16.618 D 2 = 5.50
R 3 = ∞ D 3 = 19.00 N 2 = 1.77250 ν 2 = 49.6
R 4 = ∞ D 4 = 0.30
* R 5 = 85.947 D 5 = 1.15 N 3 = 1.85961 ν 3 = 40.3
R 6 = 8.236 D 6 = 1.66
R 7 = 10.880 D 7 = 2.50 N 4 = 1.84666 ν 4 = 23.9
R 8 = 30.932 D 8 = Variable

R 9 = Aperture D 9 = 0.50
* R10 = 6.364 D10 = 2.00 N 5 = 1.69350 ν 5 = 53.2
* R11 = -64.751 D11 = 0.97
R12 = 6.317 D12 = 1.60 N 6 = 1.69350 ν 6 = 53.2
R13 = 74.670 D13 = 0.50 N7 = 1.80518 ν7 = 25.4
R14 = 3.606 D14 = Variable

R15 = -10773.414 D15 = 0.80 N 8 = 1.59270 ν 8 = 35.3
R16 = 22.665 D16 = 2.01
* R17 = -239.836 D17 = 2.00 N 9 = 1.73077 ν 9 = 40.5
* R18 = -8.195 D18 = 1.50
R19 = ∞ D19 = 1.25 N10 = 1.51633 ν10 = 64.1
R20 = ∞


\ Focal length 4.06 11.19 15.94
Variable interval \
D 8 24.74 4.62 1.21
D14 3.02 10.16 14.91


Aspheric coefficient

Fifth side: K = 9.38032e + 001 A = 0.00000e + 000 B = 4.58085e-005
C = 2.19306e-007 D = 0.00000e + 000 E = 0.00000e + 000

10th page: K = -2.05423e + 000 A = 0.00000e + 000 B = 9.53260e-004
C = 2.05880e-005 D = 3.08708e-006 E = 1.12930e-009

11th surface: K = 3.09419e + 001 A = 0.00000e + 000 B = 5.23315e-004
C = 6.73795e-005 D = -1.37951e-007 E = 2.14543e-007

17th page: K = -5.24721e + 005 A = 0.000000 + 000 B = -1.34953e-003
C = 7.75565e-006 D = 2.40415e-006 E = 6.82850e-008

18th side: K = -3.86270e + 000 A = 0.000000 + 000 B = -1.15490e-003
C = -1.03846e-005 D = 2.39892e-006 E = 6.30842e-008


Numerical Example 4
f = 4.72 to 47.00 Fno = 2.83 to 5.70 2ω = 73.8 ° to 8.6 °

R 1 = 38.973 D 1 = 1.40 N 1 = 1.84666 ν 1 = 23.9
R 2 = 30.798 D 2 = 4.50 N 2 = 1.48749 ν 2 = 70.2
R 3 = 122.673 D 3 = 0.15
R 4 = 51.633 D 4 = 3.00 N 3 = 1.48749 ν 3 = 70.2
R 5 = -1754.434 D 5 = variable

R 6 = 90.693 D 6 = 1.00 N 4 = 1.88300 ν 4 = 40.8
R 7 = 10.669 D 7 = 4.00
R 8 = ∞ D 8 = 16.00 N 5 = 1.77250 ν 5 = 49.6
R 9 = ∞ D 9 = 1.72
R10 = -22.899 D10 = 0.80 N6 = 1.88300 ν6 = 40.8
R11 = 10.079 D11 = 2.51 N7 = 1.84666 ν7 = 23.9
R12 = -67.220 D12 = variable

R13 = Aperture D13 = 0.50
* R14 = 6.982 D14 = 2.20 N 8 = 1.69350 ν 8 = 53.2
* R15 = -93.887 D15 = 0.12
R16 = 6.533 D16 = 1.70 N 9 = 1.70000 ν 9 = 48.1
R17 = -345.297 D17 = 0.50 N10 = 1.80518 ν10 = 25.4
R18 = 4.388 D18 = variable

R19 = −4.814 D19 = 0.80 N11 = 1.59270 ν11 = 35.3
R20 = -8.501 D20 = variable

* R21 = -329.800 D21 = 2.50 N12 = 1.73077 ν12 = 40.5
* R22 = -7.419 D22 = 1.50
R23 = ∞ D23 = 1.20 N13 = 1.51633 ν13 = 64.1
R24 = ∞


\ Focal length 4.72 20.18 47.00
Variable interval \
D 5 0.50 20.41 30.19
D12 20.35 6.37 0.53
D18 8.31 11.74 19.73
D20 0.05 4.76 2.21


Aspheric coefficient

14th surface: K = -2.24473e + 000 A = 0.000000 + 000 B = 9.14803e-004
C = 1.12793e-005 D = 4.60802e-007 E = 1.23365e-007

15th surface: K = 7.96496e + 001 A = 0.00000e + 000 B = 5.84958e-004
C = 2.07949e-005 D = 3.35953e-007 E = 2.42783e-007

21st surface: K = -3.71416e + 006 A = 0.000000 + 000 B = 6.20063e-004
C = -3.65360e-005 D = 2.12651e-006 E = -7.06009e-008

Side 22: K = -5.42295e + 000 A = 0.00000e + 000 B = -2.667263e-004
C = 1.60929e-005 D = -2.79043e-007 E = -2.222830e-008


Numerical Example 5
f = 4.71 to 17.20 Fno = 3.00 to 5.70 2ω = 74.0 ° to 23.3 °

R 1 = 24.836 D 1 = 4.80 N 1 = 1.48749 ν 1 = 70.2
R 2 = 624.170 D 2 = 0.15
R 3 = 52.758 D 3 = 1.00 N 2 = 1.88300 ν 2 = 40.8
R 4 = 9.454 D 4 = 3.99
R 5 = ∞ D 5 = 10.00 N 3 = 1.77250 ν 3 = 49.6
R 6 = ∞ D 6 = 0.62
R 7 = -116.585 D 7 = 0.60 N 4 = 1.88300 ν 4 = 40.8
R 8 = 11.497 D 8 = 0.39
R 9 = 11.586 D 9 = 2.20 N 5 = 1.84666 ν 5 = 23.9
R10 = 96.006 D10 = variable

R11 = Aperture D11 = 0.80
* R12 = 6.260 D12 = 2.00 N 6 = 1.69350 ν 6 = 53.2
* R13 = -29.247 D13 = 0.40
R14 = 6.846 D14 = 1.60 N7 = 1.69350 ν7 = 53.2
R15 = 38.913 D15 = 0.50 N8 = 1.80518 ν8 = 25.4
R16 = 3.683 D16 = Variable

R17 = -19.887 D17 = 0.80 N9 = 1.59270 ν9 = 35.3
R18 = 253.579 D18 = 5.01
* R19 = -144.382 D19 = 2.00 N10 = 1.73077 ν10 = 40.5
* R20 = -8.877 D20 = 1.50
R21 = ∞ D21 = 1.25 N11 = 1.51633 ν11 = 64.1
R22 = ∞


\ Focal length 4.71 12.20 17.20
Variable interval \
D10 22.19 4.10 0.80
D16 1.34 7.37 11.39


Aspheric coefficient

12th surface: K = -2.04787e + 000 A = 0.000000 + 000 B = 8.99345e-004
C = 9.83531e-006 D = 1.09240e-006 E = 1.30132e-007

Side 13: K = -2.43093e + 001 A = 0.00000e + 000 B = 4.71249e-004
C = 2.02216e-005 D = 9.59498e-007 E = 2.13765e-007

19th surface: K = -5.24460e + 005 A = 0.000000 + 000 B = -1.59761e-003
C = -5.35728e-006 D = 2.83552e-006 E = 8.20922e-008

20th page: K = -3.79995e + 000 A = 0.000000 + 000 B = -1.32477e-003
C = -1.50934e-005 D = 2.37139e-006 E = 7.29888e-008


Numerical Example 6
f = 4.70 to 17.48 Fno = 2.90 to 5.70 2ω = 74.1 ° to 23.0 °

R 1 = 26.182 D 1 = 1.20 N 1 = 1.88300 ν 1 = 40.8
R 2 = 12.548 D 2 = 4.06
R 3 = ∞ D 3 = 15.00 N 2 = 1.77250 ν 2 = 49.6
R 4 = ∞ D 4 = 0.46
R 5 = 481.879 D 5 = 0.60 N 3 = 1.88300 ν 3 = 40.8
R 6 = 10.074 D 6 = 0.85
R 7 = 10.760 D 7 = 2.20 N 4 = 1.84666 ν 4 = 23.9
R 8 = 32.602 D 8 = Variable

R 9 = Aperture D 9 = 0.80
* R10 = 6.238 D10 = 2.00 N 5 = 1.69350 ν 5 = 53.2
* R11 = -43.029 D11 = 0.48
R12 = 6.306 D12 = 1.60 N 6 = 1.69350 ν 6 = 53.2
R13 = 24.260 D13 = 0.50 N 7 = 1.80518 ν 7 = 25.4
R14 = 3.536 D14 = variable

R15 = −94.680 D15 = 0.80 N 8 = 1.59270 ν 8 = 35.3
R16 = 22.419 D16 = 4.60
* R17 = -219.255 D17 = 2.00 N 9 = 1.73077 ν 9 = 40.5
* R18 = -8.195 D18 = 1.50
R19 = ∞ D19 = 1.25 N10 = 1.51633 ν10 = 64.1
R20 = ∞


\ Focal length 4.70 12.37 17.48
Variable interval \
D 8 21.69 3.96 0.79
D14 1.69 8.37 12.82


Aspheric coefficient

10th page: K = -2.13082e + 000 A = 0.00000e + 000 B = 9.70421e-004
C = 1.88054e-005 D = 7.25651e-007 E = 1.47315e-007

11th surface: K = 6.87585e-001 A = 0.00000e + 000 B = 5.62449e-004
C = 2.90541e-005 D = 1.23619e-006 E = 2.14543e-007

17th surface: K = -5.24460e + 005 A = 0.000000 + 000 B = -1.34953e-003
C = 7.75565e-006 D = 2.40415e-006 E = 6.82850e-008

18th side: K = -3.86270e + 000 A = 0.000000 + 000 B = -1.15490e-003
C = -1.03846e-005 D = 2.39892e-006 E = 6.30842e-008


Numerical Example 7
f = 6.01 to 11.99 Fno = 3.55 to 4.77 2ω = 61.1 ° to 33.0 °

R 1 = 13.377 D 1 = 1.00 N 1 = 1.69680 ν 1 = 55.5
R 2 = 8.661 D 2 = 3.20
R 3 = ∞ D 3 = 12.00 N 2 = 1.77250 ν 2 = 49.6
R 4 = ∞ D 4 = 0.72
R 5 = -11.096 D 5 = 1.50 N 3 = 1.84666 ν 3 = 23.9
R 6 = -9.619 D 6 = 0.60 N 4 = 1.48749 ν 4 = 70.2
R 7 = 53.531 D 7 = Variable

R 8 = Aperture D 8 = 0.30
* R 9 = 4.117 D 9 = 2.10 N 5 = 1.69350 ν 5 = 53.2
* R10 = -136.716 D10 = 0.30
R11 = -1001.639 D11 = 1.00 N 6 = 1.80518 ν 6 = 25.4
R12 = 3.673 D12 = 0.20
R13 = 5.134 D13 = 1.60 N 7 = 1.64769 ν 7 = 33.8
R14 = -31.878 D14 = variable

* R15 = -8.349 D15 = 0.80 N 8 = 1.58306 ν 8 = 30.2
* R16 = -11.353 D16 = 1.20
R17 = ∞ D17 = 1.25 N 9 = 1.51633 ν 9 = 64.1
R18 = ∞


\ Focal length 6.01 9.75 11.99
Variable interval \
D 7 9.85 3.04 1.00
D14 5.00 7.35 8.76


Aspheric coefficient

Surface 9: K = 3.39452e-002 A = 0.00000e + 000 B = 2.47151e-005
C = 1.70872e-004 D = -4.04778e-005 E = 6.93891e-006

10th page: K = -3.52243e + 003 A = 0.000000 + 000 B = 2.21925e-003
C = 1.25471e-004 D = 3.61107e-005 E = 6.09430e-007

Fifteenth surface: K = -1.73320e + 001 A = 0.000000 + 000 B = 1.40872e-004
C = 3.09883e-004 D = 0.00000e + 000 E = 0.00000e + 000

16th surface: K = -1.43760e + 002 A = 0.000000 + 000 B = -1.34966e-003
C = 4.76635e-004 D = 0.00000e + 000 E = 0.00000e + 000


Numerical Example 8
f = 4.72 to 25.35 Fno = 2.88 to 5.70 2ω = 73.9 ° to 15.9 °

R 1 = 41.094 D 1 = 1.40 N 1 = 1.84666 ν 1 = 23.9
R 2 = 31.826 D 2 = 4.27 N 2 = 1.60311 ν 2 = 60.6
R 3 = -115.121 D 3 = Variable

R 4 = 42.048 D 4 = 1.00 N 3 = 1.88300 ν 3 = 40.8
R 5 = 9.626 D 5 = 4.60
R 6 = ∞ D 6 = 13.00 N 4 = 1.77250 ν 4 = 49.6
R 7 = ∞ D 7 = 1.50
R 8 = -29.360 D 8 = 0.80 N 5 = 1.88300 ν 5 = 40.8
R 9 = 9.947 D 9 = 2.52 N 6 = 1.84666 ν 6 = 23.9
R10 = -82.211 D10 = variable

R11 = Aperture D11 = 0.50
* R12 = 7.020 D12 = 2.00 N 7 = 1.69350 ν 7 = 53.2
* R13 = -51.680 D13 = 0.12
R14 = 5.928 D14 = 1.70 N 8 = 1.70000 ν 8 = 48.1
R15 = 245.373 D15 = 0.50 N 9 = 1.80518 ν 9 = 25.4
R16 = 3.935 D16 = variable

R17 = −5.344 D17 = 0.80 N10 = 1.59270 ν10 = 35.3
R18 = -8.824 D18 = variable

* R19 = -1068.095 D19 = 2.30 N11 = 1.73077 ν11 = 40.5
* R20 = -9.800 D20 = 1.50
R21 = ∞ D21 = 1.20 N12 = 1.51633 ν12 = 64.1
R22 = ∞


\ Focal length 4.72 15.08 25.35
Variable interval \
D 3 0.50 17.95 24.42
D10 17.89 5.06 1.66
D16 5.11 8.02 10.13
D18 0.45 4.57 7.14


Aspheric coefficient

12th surface: K = -2.30595e + 000 A = 0.000000 + 000 B = 8.27907e-004
C = 1.07097e-005 D = 7.26909e-007 E = 6.74461e-008

Side 13: K = 1.03854e + 002 A = 0.00000e + 000 B = 4.93684e-004
C = 3.12276e-005 D = -9.53203e-007 E = 2.05246e-007

19th surface: K = -3.771416e + 006 A = 0.00000e + 000 B = -3.00095e-005
C = -1.88815e-005 D = 9.79652e-007 E = -3.07789e-008

20th page: K = -5.57356e + 000 A = 0.000000 + 000 B = -7.28724e-004
C = 2.71176e-005 D = -8.10283e-007 E = -3.89311e-010

  Next, an embodiment of a lens shutter type digital compact camera as the image pickup apparatus of the present invention will be described with reference to FIG.

  In FIG. 42, 10 is a digital camera body, and 11 is an optical system according to the present invention. Reference numeral 12 denotes a flash built in the camera body, 13 an external viewfinder, and 14 a shutter button. Reference numeral 15 denotes a schematic optical system arrangement relationship in the camera body of the optical system according to the present invention.

  Thus, by applying the image pickup apparatus of the present invention to a digital camera or the like, a small-sized image pickup apparatus having high optical performance is realized, in particular, the camera body can be thinned.

  Further, in this example, the optical system is arranged so that the optical axis deflected by the reflecting member at the time of horizontal position photographing is in the vertical (vertical) direction. However, the deflected optical axis is in the horizontal (horizontal) direction. You may arrange as follows.

Optical cross-sectional view of the zoom lens of Example 1 Optical path diagram when the optical path of the zoom lens of Example 1 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens of Example 1 Aberration diagram at the middle zoom position of the zoom lens of Example 1 Aberration diagram at the telephoto end of the zoom lens of Example 1 Optical sectional view of the zoom lens of Example 2 Optical path diagram when the optical path of the zoom lens of Example 2 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens of Example 2 Aberration diagram at the intermediate zoom position of the zoom lens of Example 2 Aberration diagram at the telephoto end of the zoom lens of Example 2 Optical sectional view of the zoom lens of Example 3 Optical path diagram when the optical path of the zoom lens of Example 3 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens of Example 3 Aberration diagram at the intermediate zoom position of the zoom lens of Example 3 Aberration diagram at the telephoto end of the zoom lens of Example 3 Optical sectional view of the zoom lens of Example 4 Optical path diagram when the optical path of the zoom lens of Example 4 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens of Example 4 Aberration diagram at the intermediate zoom position of the zoom lens of Example 4 Aberration diagram at the telephoto end of the zoom lens of Example 4 Optical sectional view of the zoom lens of Example 5 Optical path diagram when the optical path of the zoom lens of Example 5 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens in Example 5 Aberration diagram at the intermediate zoom position of the zoom lens of Example 5 Aberration diagram at the telephoto end of the zoom lens of Example 5 Optical sectional view of the zoom lens of Example 6 Optical path diagram when the optical path of the zoom lens of Example 6 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens in Example 6 Aberration diagram at the intermediate zoom position of the zoom lens of Example 6 Aberration diagram at the telephoto end of the zoom lens of Example 6 Optical sectional view of the zoom lens of Example 7 Optical path diagram when the optical path of the zoom lens of Example 7 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens in Example 7 Aberration diagram at the intermediate zoom position of the zoom lens of Example 7 Aberration diagram at the telephoto end of the zoom lens in Example 7 Optical cross section of the zoom lens of Example 8 Optical path diagram when the optical path of the zoom lens of Example 8 is bent 90 degrees Aberration diagram at the wide-angle end of the zoom lens in Example 8 Aberration diagram at the middle zoom position of the zoom lens of Example 8 Aberration diagram at the telephoto end of the zoom lens in Example 8 Explanatory diagram of optical characteristics when the image sensor falls down in the present invention Explanatory drawing of the imaging device of the present invention Explanatory drawing of the basic composition of the optical system concerning the present invention

Explanation of symbols

OB Optical system FF First FF lens group FR First FR lens group PRZ Reflective member CP Imaging element LU Optical member FFN1 Lens unit FFN2 Lens unit FRF Lens unit M Moving mechanism L1 First lens unit L2 Second lens unit L3 Third lens unit L4 Fourth lens unit L5 Fifth lens unit SP Aperture IP Image plane G Glass block d d line g g line ΔS Sagittal image plane ΔM Meridional image plane

Claims (18)

In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device, when the diagonal length of the effective screen of the imaging device is LD,
Within a distance LD in air-converted length from the image sensor,
An imaging apparatus comprising: a lens member having refractive power that moves integrally with the imaging element in the optical axis direction. The lens member has a lens having a positive refractive power, and when the focal length of the lens having the positive refractive power is PFL and the focal length of the optical system is Fw, 0.15 <Fw / PFL <0.55
The imaging apparatus according to claim 1, wherein the following condition is satisfied.   The imaging apparatus according to claim 1, wherein the lens member includes a lens having a negative refractive power including an aspherical surface.   The optical system is housed in a lens barrel, the optical system is disposed on the object side, and is disposed on the most image side with the first FF lens group having a negative refractive power fixed to the lens barrel, 4. The image pickup apparatus according to claim 1, further comprising a first FR lens group including a lens member, wherein the FF lens group includes a reflecting member that deflects an optical axis. 5.   The imaging apparatus according to claim 4, wherein the first FF lens group includes a lens unit having a negative refractive power and a reflecting member in order from the object side to the image side.   6. The image pickup apparatus according to claim 4, wherein the optical system is a zoom lens in which the first FR lens group moves during zooming. When the focal length of the FF lens group is FFW, or when the lens group FFa that moves during zooming is disposed closer to the object side than the FF lens group, the lens group FFa and the FF lens group at the wide-angle end When the combined focal length is FFW, the combined focal length at the wide angle end of all the lens units arranged on the image side of the FF lens group is FRW, and the focal length of the entire system at the wide angle end is FW, 0.25 <| Fw / FFw | <0.6 (however, FFw <0)
0.25 <Fw / FRw <0.9
The imaging apparatus according to claim 6, wherein the following condition is satisfied. In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes 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, which are disposed in order from the object side to the image side.
The third lens group includes a lens member having a positive refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The first lens group has a reflecting member for deflecting the optical axis,
The first lens group is stationary during zooming,
The second lens group moves to the object side,
The image pickup apparatus, wherein the third lens group moves integrally with the image pickup device. The focal length of the lens member is PFL,
When the focal length of the entire system at the wide angle end is FW, 0.15 <Fw / PFL <0.55
The imaging apparatus according to claim 8, wherein the following condition is satisfied. When the focal length of the first lens group is FFW and the combined focal length of the second and third lens groups at the wide angle end is FRW 0.25 <| Fw / FFw | <0.6 (provided that FFw <0 )
0.25 <Fw / FRw <0.9
The imaging apparatus according to claim 8, wherein the following condition is satisfied. In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes 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 negative refractive power, which are arranged in order from the object side to the image side.
The third lens group includes a lens member having a negative refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The first lens group has a reflecting member for deflecting the optical axis,
The first lens group is stationary during zooming,
The second lens group moves to the object side,
The image pickup apparatus, wherein the third lens group moves integrally with the image pickup device. When the focal length of the first lens group is FFW and the combined focal length of the second and third lens groups at the wide angle end is FRW 0.25 <| Fw / FFw | <0.6 (provided that FFw <0 )
0.25 <Fw / FRw <0.9
The imaging apparatus according to claim 11, wherein the following condition is satisfied. In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a positive lens having a positive refractive power arranged in order from the object side to the image side. Having a fourth lens group;
The fourth lens group includes a lens member having a positive refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The second lens group has a reflecting member for deflecting the optical axis,
The second lens group does not move during zooming,
The first lens group and the third lens group move to the object side,
The image pickup apparatus, wherein the fourth lens group moves integrally with the image pickup device. The focal length of the lens member is PFL,
When the focal length of the entire system at the wide angle end is FW, 0.15 <Fw / PFL <0.55
The imaging apparatus according to claim 13, wherein the following condition is satisfied. When the combined focal length of the first and second lens units at the wide-angle end is FFW, and the combined focal length of the third and fourth lens units at the wide-angle end is FRW 0.25 <| Fw / FFw | <0. 6 (however, FFw <0)
0.25 <Fw / FRw <0.9
The imaging device according to claim 13, wherein the following condition is satisfied. In an imaging apparatus having an imaging device and an optical system that forms an image on the imaging device,
The optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a third lens group having a negative refractive power, which are arranged in order from the object side to the image side. A fourth lens group, a fifth lens group having a positive refractive power,
The fifth lens group includes a lens member having a positive refractive power within a distance LD with an air-converted length from the image sensor when the diagonal length of the effective screen of the image sensor is LD.
The second lens group has a reflecting member for deflecting the optical axis,
The second lens group does not move during zooming,
The first, third, and fourth lens groups move to the object side,
The imaging device, wherein the fifth lens group moves integrally with the imaging device. The focal length of the lens member is PFL,
When the focal length of the entire system at the wide angle end is FW, 0.15 <Fw / PFL <0.55
The image pickup apparatus according to claim 16, wherein the following condition is satisfied. When the combined focal length of the first and second lens units at the wide angle end is FFW and the combined focal length of the third, fourth, and fifth lens units at the wide angle end is FRW 0.25 <| Fw / FFw | <0.6 (however, FFw <0)
0.25 <Fw / FRw <0.9
The imaging apparatus according to claim 16, wherein the following condition is satisfied.

Images