JP2002049070A - Vibration-proof zoom lens device and camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately correct image blur on a close distance side. SOLUTION: As for the vibration-proof zoom lens device provided with an image blur correcting optical system positioned closer to an image side than a variable power moving lens group and a focusing moving lens group, provided that the displacement of the image blur correcting optical system is expressed by ΔS, a half viewing field is expressed by y00, an image height corresponding to the half viewing field y00 is expressed by y0, the image moving sensitivity of the image blur correction optical system is expressed by dy, a vibration angle is expressed by θ, and a distance from an object to the rotational center of the vibration is expressed by L, the device is controlled so as to satisfy 0.9<=-L.y0.tanθ/(y00.dy.ΔS)<=1.1 (step S6).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration zoom lens apparatus and a camera system having a function of correcting image blur caused by vibration, and more particularly, to a zoom lens apparatus and a focusing lens group which are arranged closer to the image than the focusing lens group. Image blur correction optical system, such as a variable vertex angle prism (variable angle prism, V
This is suitable for a film camera, a television camera, a video camera, or the like that controls a shift lens or the like that moves in a direction orthogonal to the shooting optical axis.

[0002]

2. Description of the Related Art When a photographing optical system vibrates due to camera shake, wind, or the like, image blur occurs on an image forming surface. Conventionally, a zoom lens apparatus having a function of correcting this image blur, particularly an image stabilizing zoom lens apparatus in which an image blur correction optical system such as a variable apex prism or a shift lens is arranged closer to the image side than the variable power moving lens group, Various proposals have been made to reduce the size and weight of the shake correction optical system, which is advantageous for reducing the size and power saving of the drive system.

[0003]

Generally, the amount of image blur (the amount of image movement) Δy with respect to an object at infinity is represented by Δy = f when the displacement angle of the photographing optical system due to vibration is θ and the focal length is f. Tan θ (1) Next, the displacement amount ΔS _inf of the image blur correction optical system for _canceling the image blur amount _Δy is ΔS _inf = −f · tan θ / dy ·, where dy is the image movement sensitivity of the image blur correction optical system. ··· (2)

However, for a finite distance object,
The image blur amount deviates from the equation (1) due to the change in the angle of view due to the focus and the influence of the rotation center of the vibration, and the effect becomes particularly remarkable at a short distance. Therefore, there is a problem that the image blur remains on the short distance side even if the image blur correction is performed based on the equation (2).

(Object of the Invention) It is an object of the present invention to provide an image stabilizing zoom lens device and a camera system capable of appropriately performing image blur correction on a short distance side.

[0006]

In order to achieve the above object, the present invention relates to a vibration-proof zoom lens apparatus having an image blur correcting optical system on the image side of the variable power moving lens group and the focusing moving lens group. The displacement ΔS of the image blur correction optical system.
, The image height corresponding to the half field of view y00, the image movement sensitivity of the image blur correction optical system is dy, the vibration angle is θ, and the distance from the object to the rotation center of the vibration is L, 0.9 ≦ −L · y0 · tan θ / (y00 · dy · △
S) ≦ 1.1 is controlled.

Further, the present invention has an image blur correcting optical system on the image side of the variable power moving lens group and the focusing moving lens group,
The displacement ΔS of the image blur correction optical system is defined as
0, the image height corresponding to the half field of view y00 is y0, the image movement sensitivity of the image blur correction optical system is dy, the vibration angle is θ, and the distance from the object to the rotation center of the vibration is L. .9 ≦ −L · y0 · tan θ / (y00 · dy · △
S) A camera system including an anti-shake zoom lens device that controls so as to satisfy ≦ 1.1 and a camera that communicates signals with the anti-shake zoom lens device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an image blur correction optical system, there are a variable apex prism and a shift lens, but a shift lens system is adopted as an example, and a partial system in a photographing optical system is decentered in a direction orthogonal to a photographing optical axis. The generation of eccentric aberration in the case of the above will be described below based on the method presented by Matsui at the 23rd Lecture on Applied Physics (1962) from the viewpoint of aberration theory.

When the lens unit p of the photographing lens is decentered in parallel by E, the aberration amount △ ′ Y of the whole system is equal to the aberration amount △ Y before decentering as shown in the equation (a) in Equation 1. It is the sum of the eccentric aberration amount ΔY (E) generated by the eccentricity. Here, the eccentric aberration ΔY (E) is expressed by the first-order eccentric coma (IIE) and the first-order eccentric astigmatism (III) as shown in the equation (b).
E) Primary eccentric field curvature (PE), Primary eccentric distortion (VE1), Primary eccentric distortion additional aberration (VE2), 1
It is represented by the next origin movement (△ E). In addition, when the focal length of the entire system is normalized to 1, the aberrations from (II) to (△ E) in equations (c) to (h) are represented by axial marginal rays of paraxial rays to the decentered lens group. Angle of incidence and exit angle of α
_p and α _p ′, and when the incident angle and the exit angle of the principal ray passing through the pupil center are ￣ (α _p ) and ￣ (α _p ) ′, respectively, the aberration coefficients I _p , II _p , III _p , P _p , V
_p , and the aberration coefficient I of the lens system on the image side of the decentering lens group.
_q, II _q, III _q, represented with P _q, V _q.

[0010]

(Equation 1)

In the case of tilting eccentricity such as a variable apex prism
Is also represented by a similar expression. Of these, image movement due to eccentricity
Represents the primary origin movement (△ E), and the image movement amount
From the equations (b) and (h), Y (E) is R = 0, tanω =
0, α_k ′ = 1 (R is the entrance pupil diameter, ω is the angle of view, α_k ’Is the axis
Y (E) = (１ ／) E ・ (△ E) = E ・ (α)_p ’-Α_p ) (3) Therefore, the image movement sensitivity of the image blur correction optical system
The sensitivity dy is obtained by calculating the primary origin movement of the image blur correction optical system by (△
E)_is, The converted tilt angle before and after the image blur correction optical system is α _is, Α
_is, Dy = − (（) · (△ E) = − (α_is’-Α_is) (4)

As shown in FIG. 1, when an image blur correcting optical system IS is provided on the image side of the variable power moving lens group including the variator V and the compensator C, the focus lens group F, the variator V, and the compensator C are used for zooming. Since the image point I ′ to be formed does not change, considering the image forming relationship of only the relay lens group R (the image blur correction optical system IS and the rear group Rr of the relay lens), the arrangement and the paraxial tracking value are not related to the magnification. Therefore, the image movement sensitivity dy of the image blur correction optical system IS is a constant. In FIG. 1, SP denotes an aperture, and I denotes an image point.

FIG. 2 is a conceptual diagram of image blur caused by vibration of the photographing optical system. In FIG. 2, y00 is a half field, y0 is an image height corresponding to the half field y00, OBJ is an object distance from the front lens surface, c1 is an entrance pupil position, and t1 is an entrance pupil position c1 from the front lens surface. , Ω is the half angle of view, c2 is the rotation center of vibration of the entire photographing optical system, v1 is the distance from the front lens surface to the rotation center c2 of vibration, θ is the tilt angle due to vibration, and L is focused. The distance from the object to the rotation center c2 of the vibration, Δy00, is the amount of movement of the imaging optical axis on the object.

The photographing optical system has a rotation angle θ about the rotation center c2.
The image displacement amount △ y0 when falling down is represented by Δy0 = L · y0 · tan θ / y00 (5) Therefore, the displacement amount ΔS of the image blur correction optical system IS for canceling the image displacement amount Δy0 is given by ΔS = −L · y0 · tan θ / (y00 · dy), where the image movement sensitivity of the IS is dy. . . . (6) given by If the control of the image blur correction optical system IS deviates from the expression (6), the image blur remains on the screen in proportion to the amount of the deviation. As a result of our verification, it has been found that if the residual amplitude after image blur correction is 10% or less before the image blur correction, the image quality improvement effect is large, and if it is 20% or more, the image quality improvement effect is small.

Further, an image displacement amount △ is calculated using a data table.
When the control of S is performed, it is difficult to control the image blur correction optical system IS so as to strictly satisfy the expression (6). Therefore, the image blur correction optical system IS is controlled within the range of the following equation (7).

0.9 ≦ −L · y0 · tan θ / (y00 · dy · ΔS) ≦ 1.1. . . (7) In equation (6), (y0 / y00) is determined by the zoom state and the in-focus state, and thus can be obtained by using the zoom state detecting means and the in-focus state detecting means. Since L is determined by the in-focus state and the position of the center of rotation of the vibration, it can be obtained by using the in-focus state detecting means and the vibration detecting means. Rotation center position v
1 and the vibration angle θ can be obtained by using a vibration detecting means. Since the image blur correction optical system IS is on the image side of the variable power moving lens units V and C and the focusing movable lens unit F, dy is constant regardless of the variable power state and the in-focus state.

Therefore, the information of the variable power state detecting means, the in-focus state detecting means, and the vibration detecting means is calculated based on the equation (6), and the displacement ΔS of the image blur correction optical system IS is controlled. Irrespective of the zoom state and the in-focus state, it is possible to completely correct image blur caused by vibration of the photographing optical system.

By using a plurality of acceleration sensors or the like in the direction of the photographing optical axis as the vibration detecting means, for example,
It is possible to simultaneously detect the rotation center position v1 of the vibration and the vibration angle θ.

Next, a specific configuration of the image stabilizing zoom lens device according to one embodiment of the present invention will be described.

<Numerical Example 1> FIG. 3 shows Numerical Example 1 in one embodiment of the present invention. FIG. 4 is a lens cross-sectional view of the numerical example 1 at the wide-angle end.

In FIG. 4, F denotes a focus lens group (front lens group) having a positive refractive power as a first group. V
Numeral denotes a variator having a negative refractive power for zooming as a second lens unit. The variator performs zooming from the wide-angle end to the telephoto end by monotonously moving on the imaging optical axis toward the image plane. C is a compensator having a positive refractive power, and moves non-linearly on the photographing optical axis to the object side in order to correct the image plane fluctuation due to zooming. The variator V and the compensator C constitute a zoom optical system (variable-moving lens group). SP is aperture, R is 4th
A fixed relay lens group having a positive refractive power as a group, and Rr is a rear lens group. IE is a focal length conversion optical system,
P is a color separation prism, an optical filter, or the like, and is shown as a glass block in FIG.

Next, the features of the fourth group relay lens unit R in Numerical Data Example 1 will be described. The fourth relay lens group R includes an image blur correction optical system IS having a negative refractive power, a focal length conversion optical system IE, and a rear lens group Rr having a positive refractive power.
And has a function of moving the image blur correction optical system IS in a direction perpendicular to the photographing optical axis for image blur correction.
The image blur correction optical system IS is composed of two negative lenses and one positive lens.

Further, each eccentric aberration coefficient corresponding to the equations (c) to (h) is represented by p, the lens group of the image blur correction optical system IS is denoted by p, and the lens group on the image side of the image blur correction optical system IS is denoted by q. The result is as shown in FIG.

From FIG. 5, it can be seen from the equation (4) that the image movement sensitivity dy of the image blur correction optical system IS is as follows: dy = − (1/2) · (ΔE) = − 0.848. . . (8) Since the image point I ′ (FIG. 1) formed by the lens units F, V, and C does not change over the entire zooming range, the arrangement and paraxial tracking value of the relay lens unit R change when the imaging relationship of only the relay lens unit R is considered. The image blur correction optical system I is constant regardless of the magnification.
The image movement sensitivity dy of S is a constant. Therefore, when focusing on infinity, the image movement amount ΔY due to the vibration of the displacement angle θ (vibration angle) and the image blur correction optical system I for correcting the image blur.
S displacement amount (correction amount) ΔS is represented by ΔY = f · tan θ. . . (9) ΔS (f) = − ΔY / dy = −f · tan θ / (− 0.848). . . (10) can be obtained.

Further, as described above, the displacement .DELTA.S of the image blur correction optical system IS can be obtained by equation (6).
FIG. 6 shows the value of the half field of view y00 (y0 = 5.5 mm, tan ω only at infinity) at each zooming position and focusing position.
This parameter can be easily calculated by ray tracing or the like.

Therefore, the equation (6) is transformed into the following equation (11), and the parameter C1 (F) is calculated based on FIG.
And C2 (Z, F) are obtained and stored as a data table, and are read out according to the zoom state and the in-focus state, so that the displacement ΔS of the image blur correction optical system IS can be easily calculated. it can.

ΔS = − {C1 (F) −v1} · C2 (Z, F) · tan θ. . . (11) However, C1 (F) = OBJ C2 (Z, F) = y0 / (y00 · dy) Further, when it is assumed that the rotation center c2 such as the tripod pedestal position is almost constant, the distance v1 is set to a predetermined constant. By giving it as v10, equation (11) can be transformed into the following equation (12). Parameter C3 (Z, F) based on FIG.
Is obtained and stored as a data table, and is read out according to the zoomed state and the in-focus state, whereby the displacement ΔS of the image blur correction optical system IS can be more easily calculated.

ΔS = C3 (Z, F) · tan θ. . . (12) However, C3 (Z, F) = − L · y0 / (y00 · dy) L = OBJ−v10 As a result, only the vibration angle θ needs to be detected using an angular velocity sensor or the like as the vibration detecting means. In addition, the configuration and calculation of the vibration detecting means become easier.

Next, FIG. 7 shows an image stabilizing zoom lens device and a video camera according to an embodiment of the present invention.
It is a block diagram of a camera system suitable for broadcasting.

The camera system shown in FIG. 7 comprises an anti-shake zoom lens device 1 and a video camera 2. The anti-shake zoom lens device 1 has a CPU 28 and the video camera 2 has a CPU 28.
40 are provided respectively. C of video camera 2
The signal exchange between the camera and the lens is performed by the PU 40 and the CPU 28 of the image stabilizing zoom lens device 1 performing serial communication. An image formed by the image stabilizing zoom lens device 1 is formed on a CCD 41 serving as an image sensor of the video camera 2, charges are sequentially read from the CCD 41, and the charges pass through a video signal processing circuit 42. Are output as video signals by the video output circuit 43.

The anti-vibration zoom lens apparatus 1 includes a focus optical system 24 and a zoom optical system 26. The focus optical system 24 is connected to the first focus lens group F shown in FIG. Numeral 26 corresponds to a variable power moving lens group composed of a second group variator V and a third group compensator C in FIG.

A focus position sensor 25 is disposed in the focus lens group 24, and a zoom position sensor 27 is disposed in the zoom optical system 26.
The signal from 5 is converted into a digital signal by an AD converter 44 for reading a focus position, and the signal from the zoom position sensor 27 is converted into a digital signal by an AD converter 45 for reading a zoom position. With the focus position sensor 25 and the zoom position sensor 27, the positions of the focus optical system 24 and the zoom optical system 26 can be read. Behind the zoom optical system 26, there is the image blur correction optical system 3, and the image blur correction optical system IS of the fourth group relay lens group R in FIG.
Is equivalent to A voice coil motor 15 is provided for moving the image blur correction optical system 3 in the horizontal direction (yaw direction) perpendicular to the photographing optical axis, and a voice coil motor 5 is provided for moving in the vertical direction (pitch direction). The yaw control DA converter 20 and the servo amplifier 19 are configured to drive the voice coil motor 15 in the yaw direction, and the pitch control DA converter 10 and the servo amplifier 9 are configured to drive the voice coil motor 5 in the pitch direction. Have been.

The yaw position detecting sensor 16 is used for detecting the position in the yaw direction when the image blur correction optical system 3 is shifted.
However, a pitch position detection sensor 6 is provided for position detection in the pitch direction.

A yaw angular velocity sensor 18 is provided as a detector for yaw direction vibration applied to the lens, and a pitch angular velocity sensor 8 is provided as a detector for pitch direction vibration.
1, AD converter 23, pitch filter 11, AD
A converter 13 is configured. The displacement angle can be read by integrating the angular velocity taken into the CPU 28.

The voice coil motor 15, the yaw position detecting sensor 16 and the yaw angular velocity sensor 18
And a voice coil motor 5, a pitch position detection sensor 6 and a pitch angular velocity sensor 8
Is composed.

Next, a rotatable extender holding member 30 is provided behind the image blur correction optical system 3, and includes a first extender 31 (conversion magnification 1x), a second extender 32 (2x), and a third extender. 33 (1.5
x) and four of the fourth extenders 34 (0.8x) are held, and one of them is selectively switched and used. The extender selected here corresponds to the focal length conversion optical system IE in FIG. The light beam that has passed through the extender is then imaged by the CCD 41. Note that an extender having a conversion magnification of 2.7 times may be further added, or may be replaced with any of the extenders.

At present, the CCD 4 is adjusted according to the aspect ratio of the screen.
There is a camera system that changes the readout area of No. 1. In a 2/3 inch CCD, the image circle is φ11 mm when the aspect ratio is 16: 9 and φ9 mm when the aspect ratio is 4: 3.
The readout area is set as an image circle. With this setting, the 16: 9 CCD 41 can be realized by cutting off the horizontal to 4: 3 size. However, up to now, the aspect ratio of 4: 3 at the image size of φ11 has been the standard in the camera, and when the extender used as the reference is the same, the image size φ9 is smaller than the image size φ11 by φ
11 / φ9 ≒ This is an image enlarged by a factor of 1.2. To cope with this, an image size conversion optical system for converting the range of φ11 mm into φ9 mm is prepared on the lens side, so that the system can be used in the same manner as the φ11 image size of 4: 3. It becomes possible.
Therefore, in the present embodiment, the standard image circle of the image stabilizing zoom lens device 1 is φ11 mm, and the reference extender is the first extender 31 (1x). On the other hand, when the image circle is φ9 mm, the reference extender is φ9 / φ1 as an image size conversion optical system.
1 ≒ 0.8x, which is based on the fourth extender 34 (0.8x). However, the second extender 32 (2x) and the third extender 33
(1.5x) is an image circle of φ11mm,
For the first reference extender 31 (1x), 2
x, 1.5x, but in the image circle of φ9 mm, the reference fourth extender 34 (0.
8x), 2x / 0.8x = 2.5x, 1.5x /
It acts as an extender for 0.8x = 1.875x. In the image circle of φ9 mm, the first extender 31 (1x) is 1x / 0.8x = 1.25 with respect to the reference fourth extender 34 (0.8x).
Acts as an extender for x. Conversely, in the case of φ11, if the fourth extender 34 (0.8x) is used, vignetting will appear in the image, so that use is prohibited.

A motor 36 is provided to rotationally drive the extender holding member 30, so that the extender can be switched electrically. The video camera 2 is provided with an extender control switch 39 and an image circle changeover switch 38. Inputs from these switches 38, 39 are taken into the CPU 40. The CPU 40 transmits the extender switching signal and the image seek switching signal to the image stabilizing zoom lens device 1 through serial communication with the CPU 28 of the image stabilizing zoom lens device 1. In addition, the first extender 31, the second
The positions of the extender 32, the third extender 33, and the fourth extender 34 are detected by an extender position detection sensor 37, and the extender position signal is input to the CPU 28. The CPU 28 outputs an extender switching control signal to the drive amplifier 35 according to the extender switching signal, the image circle switching signal, and the extender position signal.
Is performed.

The CPU 28 has a nonvolatile memory ROM 2
9, a correction coefficient for calculating a correction amount (movement amount) of the image blur correction optical system 3 with respect to a displacement angle (vibration angle) obtained by angle detection is stored in a data table based on a zoom position and a focus position. Is stored as Further, a data table for limiting the movement of the image blur correction optical system 3 after calculating the amount of correction in the yaw direction and the pitch direction of the image blur correction optical system 3 is stored.

FIG. 8 shows the image blur correcting optical system 3 with respect to the displacement angle.
5 is a correction coefficient data table used when calculating a correction amount (displacement amount) of the correction coefficient. This correction coefficient is a value obtained so that the equation (12) is satisfied, and is data calculated by ray tracing in each zoom position data and focus position data. The correction coefficient of the image blur correction optical system 3 with respect to the displacement angle in the yaw direction is Axx (x = 0, 1, 2,...,
n), image blur correction optical system 3 for displacement angle in the pitch direction
Are Bxx (x = 0, 1, 2,..., N). The data table of FIG. 8 includes correction coefficients Axx,
Bxx. Here, the zoom position data is obtained by normalizing the value from the zoom position sensor 27 to the wide-angle end (W
IDE) is 0, telephoto end (TELE) is 0xffff and 1
The value represented by the hexadecimal number and the focus position data normalize the value from the focus position sensor 25 to the nearest end (NEA).
R) is 0 and the infinite end (FAR) is 0xffff in hexadecimal notation.

FIGS. 9 to 11 show correction amount restriction data tables for restricting the movement of the image blur correction optical system 3 when each extender is inserted. Limit value data for limiting the correction amount of the image blur correction optical system 3 in the yaw direction when the image size is φ11 is Cxx (x = 0, 1, 2,...,
n), the limit value data for limiting the correction amount in the pitch direction of the image blur correction optical system 3 is Dxx (x = 0, 1, 2,.
.., n). The limit value data for limiting the correction amount in the yaw direction of the image blur correction optical system 3 when the image size is φ9 is Exx (x = 0, 1, 2,...,
n), the limit value data for limiting the correction amount in the pitch direction of the image blur correction optical system 3 is Fxx (x = 0, 1, 2,.
.., n).

The values of Cxx, Dxx, Exxx, and Fxx are numerical values calculated from the above-described method of the numerical example. FIG. 9 shows the first extender 31 (1x),
10 is a second extender 32 (2x), FIG. 11 is a third extender 33 (1.5x), and FIG.
In the correction value limit data table of the extender 34 (0.8x), limit values Cxx and Dx of the image blur correction optical system 3 corresponding to the zoom position data and the focus position data.
x, Exxx, and Fxx data. The zoom position data and the focus position data are the same normalized data as in FIG.

Next, FIG. 13 shows a schematic flowchart for calculating a correction amount for driving the image blur correction optical system 3.

It is checked whether the extender switching control signal is equal to the extender position (step S).
1) If not equal, extender rotation switching control is started (step S2). After the switching of the extenders is completed (step S3), the angular velocity signals input from the angular velocity sensors 8 and 18 are integrated (step S4).
A displacement angle is obtained (step S5). Based on the displacement angle, the zoom position data, and the focus position data, the correction amount of the image blur correction optical system 3 is calculated using the correction coefficients in the data table of FIG. 8 (step S6). When the correction amount obtained by the calculation exceeds the limit value in the data tables of FIGS. 9 to 12, the correction amount is limited by the limit value of the data table (step S7). Interpolated values are used as values between table data. Thereafter, the correction amount that has passed through the restriction processing is output to the DA converters 10 and 20 (step S8).

According to the above flow, the pitch direction correction amount and the yaw direction correction amount of the image blur correction optical system 3 are independently calculated.
The pitch direction correction amount is input to the servo amplifier 9 after being converted into an analog value by the DA converter 10. Also,
The output signal of the pitch position detection sensor 6 is also input to the servo amplifier 9, and the position control of the image blur correction optical system 3 in the pitch direction is performed based on the difference signal between the correction amount and the detection output of the pitch position detection sensor 6. The yaw direction correction amount is also converted to an analog value by the DA converter 20 and then input to the servo amplifier 19. The output signal of the yaw position detection sensor 16 is also input to the servo amplifier 19, and the position control of the image blur correction optical system 3 in the yaw direction is performed based on the difference signal between the correction amount and the detection output of the yaw position detection sensor 16.

[0046]

As described above, according to the present invention,
Image blur correction on the short distance side can be appropriately performed.

[Brief description of the drawings]

FIG. 1 is an optical conceptual diagram of an image stabilizing zoom lens device in a case where an image blur correction optical system is arranged on the image side of a variable power moving lens group.

FIG. 2 is a conceptual diagram of image blur in a vibration reduction zoom lens device.

FIG. 3 is a numerical example 1 according to one embodiment of the present invention.
FIG.

FIG. 4 is a lens cross-sectional view at a wide-angle end in Numerical Example 1.

FIG. 5 is a diagram illustrating each eccentric aberration coefficient in the case of Numerical Example 1.

FIG. 6 is a diagram illustrating a value of a half field of view y00 (y0 = 5.5 mm, tanω only at infinity) at each zooming position and focusing position in Numerical Example 1.

FIG. 7 is a block diagram illustrating a configuration of a camera system according to one embodiment of the present invention.

FIG. 8 is a diagram showing a data table of a correction coefficient with respect to a vibration angle in one embodiment of the present invention.

FIG. 9 is a diagram illustrating a data table for an extender (1x) that determines the maximum amount of movement of an image blur correction optical system for image blur correction according to an embodiment of the present invention.

FIG. 10 is a diagram illustrating a data table for an extender (2x) that determines the maximum amount of movement of an image blur correction optical system for image blur correction according to an embodiment of the present invention.

FIG. 11 is a diagram illustrating a data table for an extender (1.5x) that determines a maximum amount of movement of an image blur correction optical system for image blur correction according to an embodiment of the present invention.

FIG. 12 is a diagram illustrating a data table for an extender (0.8x) that determines the maximum amount of movement of an image blur correction optical system for image blur correction in one embodiment of the present invention.

FIG. 13 is a flowchart showing an outline of operation control in one embodiment of the present invention.

[Explanation of symbols]

 F Focus lens group V Variator C Compensator R Relay lens group IS Image blur correction optical system IE Focal length conversion optical system (extender) Rr Relay lens rear group y00 Half field of view y0 Image height c1 Entrance pupil position C2 Rotation center of vibration OBJ Object Distance v1 Distance from entrance pupil position c1 to front lens surface L Distance from focused object to rotation center c2 θ Vibration angle Δy0 Image displacement 1 Vibration-proof zoom lens device 2 Video camera 3 Image blur correction optical system 5, 15 voice coil motor 6 pitch position detection sensor 16 yaw position detection sensor 8 pitch angular velocity sensor 18 yaw angular velocity sensor 24 focus optical system 25 focus position sensor 26 zoom optical system 27 zoom position sensor 28, 40 CPU 29 ROM 31 first Extender (1x) 32 2 Extender (2x) 33 third extender (1.5x) 34 fourth extender (0.8x) 35 drive amplifiers 36 motor 37 extender position detecting sensor 38 image circle changeover switch 39 extender control switch 41 CCD

Claims (5)

[Claims] 1. An image stabilizing zoom lens device having an image blur correction optical system closer to the image side than a zooming lens unit and a focusing lens unit, the displacement amount ΔS of the image blur correction optical system.
, The image height corresponding to the half field of view y00, the image movement sensitivity of the image blur correction optical system is dy, the vibration angle is θ, and the distance from the object to the rotation center of the vibration is L, 0.9 ≦ −L · y0 · tan θ / (y00 · dy · △
S) The image stabilizing zoom lens device is controlled so as to satisfy ≦ 1.1. 2. The anti-shake zoom lens apparatus according to claim 1, wherein a predetermined constant is given as a representative value of a distance from a front lens surface of the photographing optical system to a center of rotation of the vibration. 3. The prevention method according to claim 1, wherein a correction coefficient for calculating the displacement ΔS of the image blur correction optical system by multiplying the tan θ is stored as a data table. Vibration zoom lens device. 4. The anti-vibration zoom lens device according to claim 3, wherein the data table of the correction coefficient is determined for each position of the variable magnification moving lens group and the focusing moving lens group. . 5. A camera system comprising: the image stabilizing zoom lens device according to claim 1; and a camera that performs signal communication with the image stabilizing zoom lens device.