JP5553574B2 - Zoom lens and lens device - Google Patents

Description

  The present invention relates to a zoom lens having an image blur correction function.

In recent years, with the progress of larger screens and higher resolutions of televisions and monitors, the demand for higher image quality for projected images is increasing. In order to meet this demand for higher image quality, the broadcast zoom lens is equipped with an optical encoder that can detect the position with high accuracy, thereby realizing high performance lens control. (See Patent Document 1)
In addition, zoom lenses have increased in magnification and focus, and movement of the subject on the telephoto side due to vibrations of the scaffolding on which the camera and the lens are installed, and vibrations of the lens due to wind, etc. has become a problem. In view of this, a zoom lens equipped with an image blur correction function has been developed in which a part of a lens group constituting the zoom lens is driven in a direction perpendicular to the optical axis to correct the movement of the subject due to vibration. However, when the image blur correction amount is large, there is a problem in that the influence of a decrease in the peripheral light amount is increased by bending the optical axis. Accordingly, a zoom lens with an image blur correction function that varies the amount of image blur correction in accordance with the aperture position has been proposed in order to reduce the influence of a decrease in peripheral light amount caused by image blur correction. (See Patent Document 2)

JP-A-2005-284042 JP 10-048696 A

  Conventional zoom lenses with image blur correction function use a relative position detector such as an optical encoder to detect the position of the zoom unit, and the reference position of the relative position detector is not initialized immediately after the power is turned on. The position of the zoom unit cannot be accurately grasped. For this reason, an appropriate image blur correction amount cannot be set for the current focal length, and it is very difficult to reduce the influence of a decrease in the amount of peripheral light. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a zoom lens with an image blur correction function that can perform image blur correction immediately after power-on without being affected by a decrease in peripheral light amount caused by image blur correction.

The zoom lens of the present invention is arranged on the image plane side of the lens barrel, the zoom lens group held in the lens barrel so as to be movable in the optical axis direction, and moves in the direction perpendicular to the optical axis. An image blur correction lens group that is held in the lens barrel, a zoom position detecting unit that detects a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel, and a vibration of the zoom lens device Control means for controlling the driving of the image blur correcting lens group, initialization determining means for determining whether or not the position of the zoom lens group detected by the zoom position detecting means has been initialized, and the zoom lens Origin position detecting means for outputting different signals depending on whether the group is on the wide-angle side or the telephoto side with respect to a predetermined origin position, and the control means is initialized by the zoom position detecting means. In the case where Within a predetermined maximum drive amount of the more large set the correcting lens group when the point distance is long, and controls the driving of the image blur correction lens group, in a case where the zoom position detecting means has not been initialized When the output from the origin position detection means indicates the telephoto side from the origin position, the maximum drive amount of the correction lens group is set larger than when the wide angle side is indicated from the origin position, and the image blur correction lens group The drive is controlled.
A zoom lens according to another aspect of the present invention includes a lens barrel, a zoom lens group that is held in the lens barrel so as to be movable in the optical axis direction, and is disposed closer to the image plane than the zoom lens group, and is perpendicular to the optical axis. An image blur correction lens group held in the lens barrel so as to be movable in any direction, a zoom position detecting means for detecting a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel, and a zoom lens device Control means for controlling the driving of the image blur correction lens group in accordance with the vibration of the zoom lens, and initialization discrimination means for discriminating whether or not the position of the zoom lens group detected by the zoom position detection means has been initialized. Origin position detection means for outputting different signals depending on whether the zoom lens group is on the wide-angle side or the telephoto side with respect to a predetermined origin position, and the control means detects the zoom position detection Means The zoom position detecting means controls the driving of the image blur correcting lens group within a range of a predetermined maximum driving amount of the correcting lens group that is set larger as the focal length is longer. Is not initialized, the maximum amount of movement of the image blur correction lens group is determined as follows.If the position of the zoom lens group is on the wide-angle side with respect to the origin position, the position of the zoom lens group is at the wide-angle end. The maximum movement amount for a certain case is set, and when the position of the zoom lens group is on the telephoto side with respect to the origin position, the maximum movement amount for the case where the position of the zoom lens group is the origin position is set. It is characterized by that.
A zoom lens according to another aspect of the present invention includes a lens barrel, a zoom lens group that is held in the lens barrel so as to be movable in the optical axis direction, and is disposed closer to the image plane than the zoom lens group, and is perpendicular to the optical axis. An image blur correction lens group held in the lens barrel so as to be movable in any direction, a zoom position detecting means for detecting a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel, and a zoom lens device Control means for controlling the driving of the image blur correction lens group in accordance with the vibration of the zoom lens, and initialization discrimination means for discriminating whether or not the position of the zoom lens group detected by the zoom position detection means has been initialized. Origin position detection means for outputting different signals depending on whether the zoom lens group is on the wide-angle side or the telephoto side with respect to a predetermined origin position, and the control means detects the zoom position detection Means The zoom position detecting means controls the driving of the image blur correcting lens group within a range of a predetermined maximum driving amount of the correcting lens group that is set larger as the focal length is longer. If the zoom lens group is moved to the telephoto side, moved to the wide-angle side, or not moved, the image blur correction lens group is different from each other. The maximum movement amount is set and the drive is controlled.
The lens apparatus of the present invention detects a lens barrel, a zoom lens group held in the lens barrel so as to be movable in the optical axis direction, and a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel. A zoom lens having a zoom position detecting means, and an initialization determining means for determining whether or not the position of the zoom lens group detected by the zoom position detecting means has been initialized, and a direction perpendicular to the optical axis An image blur correction lens group that corrects image blur by moving to the image blur, an image blur control unit that controls driving of the image blur correction lens group according to vibration of the lens device, and the zoom lens group has a predetermined origin position. In contrast, an adapter device with an image blur correction function having origin position detecting means for outputting different signals depending on whether it is on the wide-angle side or on the telephoto side, and is disposed closer to the image plane than the zoom lens. Statue The image blur control unit is configured to have a predetermined maximum of the correction lens group that is set larger as the focal length is longer when the zoom position detection unit is initialized. within the scope of the drive amount, and controls the driving of the image blur correction lens group, in a case where the position detecting means is not initialized, if the output from the home position detecting means indicates a telephoto side than the home position A maximum driving amount of the correction lens unit that is larger than that in the case of indicating the wide angle side from the origin position is set to control the driving of the image blur correction lens unit.
A lens apparatus according to another aspect of the present invention includes a lens barrel, a zoom lens group that is held in the lens barrel so as to be movable in the optical axis direction, and a relative relationship in the optical axis direction of the zoom lens group with respect to the lens barrel. A zoom lens comprising: a zoom position detecting means for detecting an accurate position; and an initialization determining means for determining whether or not the position of the zoom lens group detected by the zoom position detecting means has been initialized; and an optical axis An image blur correction lens group that corrects image blur by moving in a direction perpendicular to the image, an image blur control unit that controls driving of the image blur correction lens group according to vibrations of the lens device, and the zoom lens group. An adapter device with an image blur correction function having origin position detecting means for outputting different signals depending on whether the zoom lens is on the wide-angle side or the telephoto side with respect to a predetermined origin position, On the side An image blur correction function adapter device, and the image blur control means is configured such that, when the zoom position detection means is initialized, the correction lens group is set larger as the focal length is longer. Within the range of the predetermined maximum drive amount, the drive of the image blur correction lens group is controlled, and when the zoom position detection unit is not initialized, the maximum movement amount of the image blur correction lens group is When the position of the zoom lens group is on the wide-angle side with respect to the origin position, the maximum movement amount when the position of the zoom lens group is at the wide-angle end is set, and the position of the zoom lens group is relative to the origin position. When the zoom lens group is on the telephoto side, the zoom lens group is set to the maximum movement amount when the position of the zoom lens group is the origin position.
A lens apparatus according to another aspect of the present invention includes a lens barrel, a zoom lens group that is held in the lens barrel so as to be movable in the optical axis direction, and a relative relationship in the optical axis direction of the zoom lens group with respect to the lens barrel. A zoom lens comprising: a zoom position detecting means for detecting an accurate position; and an initialization determining means for determining whether or not the position of the zoom lens group detected by the zoom position detecting means has been initialized; and an optical axis An image blur correction lens group that corrects image blur by moving in a direction perpendicular to the image, an image blur control unit that controls driving of the image blur correction lens group according to vibrations of the lens device, and the zoom lens group. An adapter device with an image blur correction function having origin position detecting means for outputting different signals depending on whether the zoom lens is on the wide-angle side or the telephoto side with respect to a predetermined origin position, On the side An image blur correction function adapter device, and the image blur control means is configured such that, when the zoom position detection means is initialized, the correction lens group is set larger as the focal length is longer. If the zoom lens group is moved to the telephoto side when the drive of the image blur correction lens group is controlled within the range of the predetermined maximum driving amount, and the position detecting means is not initialized, When moving to the wide-angle side, when not moving, the maximum movement amount of the image blur correcting lens group different from each other is set, and the drive is controlled.

  According to the present invention, it is possible to perform an image blur correction that is not affected by the decrease in the amount of peripheral light caused by the image blur correction immediately after the power is turned on.

It is a block diagram of a 1st Example. It is a flowchart for demonstrating operation | movement of a 1st Example. (A) is a figure which shows the relationship between a focal distance and image blur correction lens group movement amount, (b) is a figure which shows the relationship between the position in the optical axis direction of a zoom lens group, and an origin position detection signal. It is a block diagram of the 2nd Example. It is a flowchart for demonstrating operation | movement of a 2nd Example. It is a detailed block diagram of a zoom position detection unit. It is a flowchart for demonstrating operation | movement of a 3rd Example. It is a flowchart for demonstrating operation | movement of a 4th Example. It is a flowchart for demonstrating the operation | movement of a 5th Example. It is a block diagram of a 6th Example. It is a flowchart for demonstrating operation | movement of a 6th Example.

In order to achieve the above object, a lens device of the present invention is a lens device supported by a support, and the lens device includes a correction lens , a vibration detection unit that detects vibration of the lens device , and the lens device. a drive signal calculating means for calculating a driving signal for driving the correcting lens based on the output of the vibration detection unit, a detecting vibration computing unit for calculating a vibration signal, the pan and tilt input from said support A pan / tilt component calculation unit that calculates a pan / tilt operation signal from the operation information; a subtraction unit that subtracts the pan / tilt operation signal from the drive signal and outputs the signal as the drive signal ; and the support is output. A pan / tilt speed calculator that calculates a pan speed and a tilt speed from pan / tilt operation information, and a driving signal calculator that outputs the pan / tilt speed based on the driving signal output from the subtractor. Has a correction lens driving unit for driving the positive lens, the pan speed was calculated by the pan and tilt speed calculating unit, the pan speed threshold or defined based on the angle of view, or the pan-tilt speed calculation tilt speed calculated in section is, when the above tilt speed threshold value that is determined based on the angle of view, wherein the correcting lens driving unit does not drive the correction lens, it is characterized.

  The zoom lens 100 with an image blur correction function includes a focus unit (focus lens group) 108 that is held in a lens barrel so as to be movable in the optical axis direction, and a zoom unit (zoom lens) that is held in the lens barrel so as to be movable in the optical axis direction. Group) 111. Further, the zoom lens 100 includes an image blur correction lens group 105 on the image plane side of the zoom unit 111. The image blur correction lens group 105 is driven by the actuator 106 so as to decenter the optical axis of the zoom lens 100 and suppress blurring of the subject image on the image plane caused by vibration of the zoom lens, and is perpendicular to the optical axis. Can be moved to. The position of the image blur correction lens group 105 is detected by the position detection unit 107.

  The vibration applied to the zoom lens 100 with an image blur correction function is detected by the vibration sensor 101. The DC component included in the output signal of the vibration sensor 101 is removed by the high pass filter 102, and the output of the high pass filter 102 is amplified to an appropriate level by the amplifier 103. An analog output signal from the amplifier 103 is converted into digital data by the A / D converter 104.

The relative position of the focus unit 108 with respect to the lens barrel in the optical axis direction is detected by a focus unit position detection unit (focus position detection means) 109. The relative position of the zoom unit 111 with respect to the lens barrel in the optical axis direction is detected by a zoom unit position detection unit (zoom position detection means) 112. Here, the focus unit position detection unit 109 and the zoom unit position detection unit 112 are relative position detection means such as an incremental encoder that detects a relative position with respect to a predetermined reference position. Accordingly, in the state immediately after the power is turned on, the origin position as a reference for position detection is not initialized, so that the focus unit position detection unit 109 and the zoom unit position detection unit 112 are connected to the focus unit 108 and the zoom unit 111. A position (relative position in the optical axis direction with respect to the lens barrel) with respect to the origin position (reference position) cannot be detected. Therefore, in order to initialize the focus part position detection unit 109, a focus part origin position detection part 110 is provided. The focus part origin position detection unit 110 can detect that the origin part set within the movable range in the optical axis direction of the focus part 108 is detected while the focus part 108 is moving, and can detect the origin position. . In addition, the zoom unit origin position detection unit 113 is included to initialize the zoom unit position detection unit 112. The zoom unit origin position detection unit 113 can detect that the zoom unit 111 has passed the origin position set within the movable range in the optical axis direction of the zoom unit 111 while moving, and can detect the origin position. .
In other words, in the present embodiment, position detection is performed as follows.
The focus unit position detection unit 109 and the zoom unit position detection unit 112 are incremental type detection units (sensors) that detect how the current position changes from the previous position at each sampling time. To do. The position detected by these detection units is the relative position of the focus unit or the zoom unit with respect to the past position of itself (a value indicating how the current position has changed with respect to the past position). ). This detection result (relative position) does not represent the relative position of the focus unit or the zoom unit with respect to the zoom lens (lens device) 100.
Therefore, the focus origin detection unit 110 detects the moment when the focus unit passes the predetermined position when the focus unit passes a predetermined position in the zoom lens (the origin position and the relative position with respect to the zoom lens are known). It is configured to be able to. When passing through the predetermined position, the detection result of the incremental type detection unit is matched with the coordinates of the predetermined position (relative position with respect to the zoom lens) to thereby adjust the position of the focus unit with respect to the zoom lens (relative position). ) Can be measured (calculated and detected).
According to this configuration, the position of the focus unit with respect to the zoom lens can be accurately grasped based on the detection results of the focus origin detection unit and the focus unit position detection unit, and an image blur correction function described later can be accurately performed. Can function.

  Information necessary for calculating the image blur correction control data is stored in the nonvolatile memory 114.

  In the image blur correction control unit 115, image blur correction control data is output using output data from the A / D converter 104, output data from the zoom unit position detection unit 112, coefficients stored in the nonvolatile memory 114, and the like. Calculated. The D / A converter 116 converts the output data from the image blur correction control unit 115 into an analog signal, and the drive circuit 117 drives the actuator 106 based on the output signal from the D / A converter 116.

  The image blur correction function is realized by driving an image blur correction lens group 105 that can be driven in two directions perpendicular to the optical axis. In order to drive the image blur correction lens group 105 in each direction, the same processing is performed using two of the same components including a vibration sensor. Therefore, in this embodiment, only the horizontal direction will be described, and the description in the vertical direction will be omitted.

  FIG. 3A shows the relationship (maximum movement amount diagram) between the focal length and the maximum movement amount (drive amount) of the image blur correction lens group 105 from the optical axis. The maximum amount of movement allowed for the image blur correction lens group 105 for obtaining an appropriate image blur correction effect within a range where the influence of the decrease in the peripheral light amount is small is set to be proportional to the focal length. As shown in FIG. 3A, in general, the maximum movement amount allowed for the image blur correction lens group 105 is larger on the telephoto side than on the wide angle side.

  FIG. 3B shows the relationship between the position of the zoom unit 111 and the signal output from the zoom unit origin position detection unit 113. In this embodiment, the output signal of the zoom unit origin position detection unit 113 is set to output a low level when the zoom unit 111 is on the wide angle side with respect to a predetermined origin position and a high level when the zoom unit 111 is on the telephoto side. ing.

  FIG. 2 is a flowchart showing a series of operations of the image blur correction control unit 115 in this embodiment. The operation of the image blur correction control unit 115 will be described below with reference to the flowchart of FIG.

  When power is supplied to the zoom lens 100 with an image blur correction function from a camera (not shown), the process proceeds to S101 and indicates whether or not the focus unit origin position detection unit 109 and the zoom unit origin position detection unit 113 are initialized. Set the initialization completion flags FFlag and ZFlag to 0. In step S102, the counter value Count of the position detection unit 107 corresponding to the position of the image blur correction lens group 105 is set to an initial value 0. The counter value Count is a counter that outputs a value proportional to the position of the image blur correction lens group 105, and corresponds to a counter that counts the output pulses of the incremental encoder.

  The image blur correction control unit 115 determines whether or not the focus unit origin position detection unit 110 and the zoom unit origin position detection unit 113 have detected the origin in S103. If the origin is not detected, the process proceeds to S106. . In S103, when the zoom unit origin position detection unit 113 detects the origin, the process proceeds to S104, the initialization completion flag ZFlag is set to 1, and the process proceeds to S106. If the focus part origin position detection unit 110 detects the origin in S103, the process proceeds to S105, the initialization completion flag FFlag is set to 1, and the process proceeds to S106.

  In S106, the states of the initialization completion flags ZFlag and FFlag are determined, and if both are 0 or one of them is 0, that is, if the initialization is not completed, the process proceeds to S108, and the zoom unit origin position detection unit 113 Determine the output of. As described above, in this embodiment, the image blur correction control unit 115 implements an initialization determination unit that determines whether or not the zoom unit position detection unit 112, which is a feature of the present invention, has been initialized.

If the output of the zoom unit origin position detection unit 113 is low level in S108, the process proceeds to S109. In S109, the movement amount limit value Lwide of the image blur correction group 105 corresponding to the wide-angle end is read from the nonvolatile memory 114, set to the limit data Llimit as shown by the equation (1), and the process proceeds to S111.
Llimit = Lwide (1)

On the other hand, if the output of the zoom unit origin position detection unit 113 is high in S108, the process proceeds to S110. In S110, the movement amount limit value Lmiddle of the image blur correction group 105 at the zoom unit origin position is read from the nonvolatile memory 114, set to the limit data Llimit as shown by the equation (2), and the process proceeds to S111.
Llimit = Lmiddle (2)

  As described above, when the initialization of the zoom unit position detection unit 112 and the focus unit position detection unit 109 has not been completed, the image blur correction lens group 105 is set according to the signal output of the zoom unit origin position detection unit 113. Set the travel distance limit value. As described above, when the zoom unit position detection unit 112 and the focus unit position detection unit 109 are not initialized, the driving of the image blur correction lens group 105 is controlled with an image blur correction characteristic different from that when the zoom unit position detection unit 112 and the focus unit position detection unit 109 are initialized. .

In S106, if both of the initialization completion flags ZFlag and FFlag are 1, that is, if the initialization is completed, the process proceeds to S107. In S107, the movement amount limit value Lz of the image blur correction lens group 105 corresponding to the positions of the zoom unit 111 and the focus unit 108 is read from the nonvolatile memory 114, and is set in the limit data Llimit as shown in equation (3). Proceed to
Llimit = Lz (3)

Furthermore, in S111, the output of the vibration sensor 101 is input via the A / D converter 104, and is set as vibration angular velocity data ω. In S112, the vibration angle data θc corresponding to the vibration angle is calculated from the vibration angular velocity data ω using the equation (4), and the process proceeds to S113.
θc = ∫ωdt (4)

  In S113, the position of the zoom unit 111 is read from the zoom unit position detection unit 112, and the position of the focus unit 108 is read from the focus unit position detection unit 109, and set to variables Zpos and Fpos, respectively. Here, when either of the initialization completion flags ZFlag and FFlag is 0, that is, when initialization of the position of the zoom unit 111 or the position of the focus unit 108 is not completed, the corresponding Zpos or Fpos is provisional. The value is not a value that accurately reflects the positions of the zoom unit 111 and the focus unit 108.

  In S114, the movement amount calculation coefficient of the image blur correction lens group 105 corresponding to Zpos and Fpos is read from the nonvolatile memory 114 and set to the variable β. Similarly to Zpos and Fpos, this variable β also becomes a provisional value when the values of the initialization completion flags ZFlag and FFlag are 0.

Further, in S115, the image blur correction control data Lc is calculated using equation (5), and the process proceeds to S116.
Lc = β × θc (5)

  In S116, data Lf corresponding to the position of the image blur correction lens group 105 is input from the position detection unit 107. In S117, the image blur correction control data Lc and the image blur correction group movement amount limit Llimit are compared.

If the image blur correction control data Lc is larger than the image blur correction group movement amount limit Llimit in S117, the process proceeds to S118, the image blur correction control data Lc is changed by the equation (6), and the process proceeds to S120.
Lc = Llimit (6)

On the other hand, if the image blur correction control data Lc is smaller than the image blur correction group movement amount limit −Llimit in S117, the process proceeds to S119, the image blur correction control data Lc is changed by the equation (7), and the process proceeds to S120.
Lc = −Llimit (7)

In S117, when the image blur correction control data Lc satisfies the condition of the expression (8), the process proceeds to S120.
-Llimit ≤ Lc ≤ Llimit (8)

In S120, the difference value ΔL between the image blur correction control data Lc and the position data Lf of the image blur correction lens group 105 is calculated using the equation (9), and the process proceeds to S121.
ΔL = k × (Lc−Lf) (9)
k: Arbitrary constant

  In S121, the calculated difference value ΔL is output to the D / A converter 116, and the actuator 106 is driven.

  Further, the control calculation of the zoom unit 111 is performed in S122, the control calculation of the focus unit 108 is performed in S123, and the control calculation of an iris unit (not shown) is performed in S124.

  Thereafter, the image blur correction control unit 115 repeatedly executes S103 to S124 until the power of the zoom lens 100 with the image blur correction function is turned off.

  With the configuration of the present embodiment, it is possible to reduce the influence of a decrease in the amount of peripheral light caused by the image blur correction while maintaining the image blur correction effect, and to realize a high video quality that can be used for high-definition broadcasting or the like.

  In this embodiment, the case where the movement amount limit value of the image blur correction lens group 105 is set according to the output of the zoom unit origin position detection unit 113 is described as an example. However, the same effect can be obtained even if the movement amount limit value of the image blur correction lens group 105 is set according to the outputs of both the zoom unit origin position detection unit 113 and the focus unit origin position detection unit 109.

[Example 2]
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 4 is a configuration diagram of a zoom lens 200 with an image blur correction function in a second embodiment to which the present invention can be applied. Since 101 to 117 are the same elements as in FIG. The zoom unit movement direction detection unit 201 detects the movement direction of the zoom unit 111.

  FIG. 5 is a flowchart showing a series of operations of the image blur correction control unit 115 in the present embodiment. The operation of the image blur correction control unit 115 will be described below with reference to the flowchart of FIG.

  When power is turned on to the zoom lens 200 with an image blur correction function from a camera (not shown), the process proceeds to S101. Since S101 to S107 are the same as those in the first embodiment, description thereof will be omitted.

In S106, the states of the initialization completion flags ZFlag and FFlag are determined. If both are 0 or one of them is 0, the process proceeds to S201, and the moving direction of the zoom unit 111 is determined. In S201, when the moving direction of the zoom unit 111 is the telephoto side, the process proceeds to S202, the telephoto side drive limit value Lwt is read from the nonvolatile memory 114, and the limit value Llimit is set as shown in the equation (21). Transition.
Llimit = Lwt (21)

In S201, when the moving direction of the zoom unit 111 is the wide angle side, the process proceeds to S203, the wide angle side drive limit value Ltw is read from the nonvolatile memory 114, and is set to the limit value Llimit as shown in Equation (22). Move to S111.
Llimit = Ltw (22)

Further, in S201, when the zoom unit 111 is stopped, the process proceeds to S204, the stop drive limit value Lmin is read from the nonvolatile memory 114, set to the limit value Llimit as shown in the equation (23), and the process proceeds to S111. .
Llimit = Lmin (23)

  As described above, when the initialization of the zoom unit 111 and the focus unit 108 is not completed, the movement amount limit value of the image blur correction lens group 105 is set according to the movement direction of the zoom unit 111. In this embodiment, the image blur correction control unit 115 realizes the zoom unit movement direction detection unit, which is a feature of the present invention. With this configuration, it is possible to reduce the influence of a decrease in the amount of peripheral light while maintaining the image blur correction effect, and to realize high video quality that can be used for high-definition broadcasting or the like.

[Example 3]
Since the configuration of the apparatus in this embodiment is the same as that of the first embodiment, description thereof is omitted.
FIG. 6 shows a detailed configuration of the zoom unit position detection unit 112. The zoom unit position detection unit 112 includes an encoder 112A, an A / D converter 112B, and a counter 112C. The encoder 112A outputs a rectangular wave and a sine wave according to the position of the zoom unit 111, and each of the two signals (digital A phase, digital B phase, analog A phase, Analog B phase) is output. The A / D converter 112B converts the two sine wave analog signals (analog A phase and analog B phase) output from the encoder 112A into digital data (Va, Vb). The counter 112C multiplies and discriminates two rectangular waves (digital A phase and digital B phase) output from the encoder 112A, and uses the output from the A / D converter 112B according to the position of the zoom unit 111. Count the values. The counter 112 </ b> C outputs a counter value corresponding to the position of the zoom unit 111 to the image blur correction control unit 115. The A / D converter 112B performs A / D conversion on the sine wave and outputs the obtained digital data (Va, Vb) to the image blur correction control unit 115.

  Hereinafter, the operation of the image blur correction control unit 115 in this embodiment will be described with reference to the flowchart of FIG.

  When power is supplied to the zoom lens 100 with an image blur correction function from a camera (not shown), the processing of the image blur correction control unit 115 proceeds to S300. After the initial value 0 is set in the lens initialization completion flag Flag and the focus unit position detection unit 109 is initialized by the user, the process proceeds to S102. Since S102 is the same as that of the first embodiment, description thereof is omitted. In S301, the output of the zoom unit position detection unit 112 stored when the power of the zoom lens 100 with image blur correction function was last turned off (zoom encoder A-phase data: Vma, zoom encoder B-phase data: Vmb, The zoom position (Zpow-off) is read from the nonvolatile memory (position storage means) 114. The zoom encoder A-phase data (Vma) and zoom encoder B-phase data (Vmb) are converted into digital data (Va, Vb) obtained by digitizing analog A-phase and B-phase signals output from the A / D converter 112B. Equivalent to. The read zoom position Zpow-off is temporarily set as an initial value in the counter ZoomPosition of the zoom unit position detection unit 112.

In S302, the output data Va and Vb of the zoom unit position detection unit 112 are read. In S303, it is determined whether or not the origin is detected. In S303, when the origin of the zoom unit 111 is not detected, the process proceeds to S305, and the lens initialization completion flag Flag is determined. In S305, when the lens initialization completion flag Flag is 0 or 1, the process proceeds to S306, and the lens initialization completion flag Flag is determined again. If the lens initialization completion flag is 0 in S306, the process proceeds to S307, the zoom encoder A phase data Vma read in S301 and S302 is compared with the digital A phase data Va, and the zoom encoder B phase data Vmb is converted to digital B. Compare with phase data Vb. In S307, if Vma is equal to Va and Vmb is equal to Vb, it is determined that the zoom position when the power of the zoom lens 100 with the image blur correction function was last turned off is equal to the current zoom position. To S308. In S308, the movement amount limit value Lzpow-off of the image blur correction lens group corresponding to the zoom position Zpow-off read in S301 is read from the nonvolatile memory, and is set to the limit value Llimit as shown in equation (31). Proceed to
Llimit = Lzpow-off (31)

  In S307, if either Vma and Va or Vmb and Vb are not equal, the zoom position when the power of the zoom lens 100 with the image blur correction function was previously turned off is not equal to the current zoom position. Judge and proceed to S309. In S309, the minimum value Lmin (maximum movement amount at the wide angle end) of the maximum movement amount diagram of the image blur correction lens group 105 is read from the nonvolatile memory 114 and set to the limit value Llimit. That is, since S309 is a case where the position of the zoom unit 111 cannot be accurately specified, the maximum movement amount of the image blur correction lens group 105 is determined by the minimum value Lmin of the maximum movement amount diagram of the image blur correction lens group 105. By limiting, it is possible to reliably avoid the influence of the decrease in the amount of peripheral light. After the process of S309, the process proceeds to S310.

  In S310, the lens initialization completion flag Flag is set to 1, and the process proceeds to S111.

When the lens initialization completion flag Flag is 1 in S306, the process proceeds to S111. If the origin is detected in S303, the process proceeds to S304, and the lens initialization completion flag Flag is set to 2. Then, the process proceeds from S305 to S107, the moving amount limit value Lz of the image blur correction group corresponding to the current zoom position / focus position is read from the nonvolatile memory 114, and is set to the limit value Llimit as shown in equation (32). Migrate to
Llimit = Lz (32)

Since S111 to S124 are the same as those in the first embodiment, description thereof is omitted. The image blur correction controller 115 that has completed the process of S124 proceeds to S311 and stores the zoom position data and the output data of the position detector 107 in the nonvolatile memory 114.
Thereafter, the image blur correction control unit 115 repeatedly executes S107, S111 to S124, and S302 to S311 until the power of the zoom lens 100 with an image blur correction function is turned off.

Judgment conditions of S307
Vma−α1 <Va <Vma + α1 α1 is a constant), and
Vmb−α2 <Vb <Vmb + α2 (α2 is a constant),
As described above, the same effect can be obtained even when the condition has a wide range of values.

  In the present embodiment, the case where the output of the zoom unit position detection unit 112 is stored is described as an example. However, the same effect can be obtained even if the outputs of both the zoom portion position detector 112 and the focus portion position detector 108 are stored.

  In this way, by monitoring the output of the zoom unit position detection unit 112 and setting the image blur correction group movement amount limit value according to the state, it is possible to reduce the influence of the decrease in peripheral light amount immediately after the power is turned on. Blur correction is possible.

[Example 4]
FIG. 8 is a flowchart showing a series of operations of the image blur correction control unit 115 in the present embodiment. Since the configuration in this embodiment is the same as that of the first embodiment, description thereof is omitted. The operation of the image blur correction control unit 115 will be described below with reference to the flowchart of FIG.
When power is supplied to the zoom lens 100 with an image blur correction function from a camera (not shown), the process proceeds to S400, and an initialization completion flag of the zoom unit position detection unit 112 is initialized to zero. Since S102 is the same as that of the first embodiment, description thereof is omitted. In S401, it is determined whether initialization of the zoom unit position detection unit 112 has been completed. If initialization has been completed, the process proceeds to S107, and if not, the process proceeds to S402. In S402, it is determined whether or not the origin position of the zoom unit 111 is detected. If the origin position is detected, the process proceeds to S403, and if not detected, the process proceeds to S405. In S403, the initialization completion flag ZFlag of the zoom unit position detection unit 112 is set to 1, and the process proceeds to S404. In S404, the zoom unit origin position data Zmiddle is temporarily set in the counter Zpos, and the process proceeds to S107.

  In S405, the output (origin signal) of the zoom unit origin position detection unit 113 is determined. If the output is low, the process proceeds to S406, and the zoom unit position data Zwide corresponding to the wide angle end is stored in the counter Zpos of the zoom unit position detection unit 112. Is temporarily set, and the process proceeds to S107. On the other hand, if the output of the zoom unit origin position detection unit 113 is high in S405, the process proceeds to S407, where the position data Zmiddle of the zoom unit origin position is temporarily set in the counter Zpos, and the process proceeds to S107.

  Since S107 to S124 are the same as those of the first embodiment, the description thereof is omitted.

  Thereafter, the image blur correction control unit 115 repeatedly executes S107, S111 to S124, and S401 to S405 until the power of the zoom lens 100 with the image blur correction function is turned off.

  In this way, by monitoring the output of the zoom unit origin position detection unit 113 and setting the maximum movement amount of the image blur correction lens group in accordance with the state, it is possible to reduce the influence of the decrease in peripheral light amount immediately after the power is turned on. Possible image blur correction.

[Example 5]
FIG. 9 is a flowchart showing a series of operations of the image blur correction control unit 115 in the present embodiment. Since the configuration in this embodiment is the same as that of the first embodiment, description thereof is omitted. The operation of the image blur correction control unit 115 will be described below with reference to the flowchart of FIG.

  When power is supplied to the zoom lens 100 with an image blur correction function from a camera (not shown), the process proceeds to S501. In S501, the counter Zpos of the zoom position detector 112 is temporarily set to the initial value Zinit, and the counter Fpos of the focus position detector 109 is temporarily set to the initial value Finit. In S502, the counter Count of the position detection unit 107 corresponding to the position of the image blur correction lens group 105 is set to zero.

  Next, the image blur correction control unit 115 determines the output of the zoom unit origin position detection unit 113 in S503, and drives the zoom unit 111 to the telephoto side when the level is low and to the wide angle side when the level is high.

In S504, it is determined whether or not the zoom unit origin position detection unit 113 has detected the origin. If the origin has not been detected, the process returns to S503 and continues to drive the zoom unit 111 in the origin direction until the origin position is detected. . In S504, if the zoom unit origin position detection unit 113 detects the origin, the process proceeds to S505, and the drive of the zoom unit 111 is immediately stopped, and the process proceeds to S506. In S506, the absolute position Zo at the zoom unit origin is read from the nonvolatile memory 111, and the zoom position correction value Zc is calculated using equation (51).
Zc = ZPos−Zo (51)

  Further, in S507, the absolute position Zo at the zoom unit origin is set in the counter ZPos of the zoom unit position detection unit 112. In S508, the zoom unit control data is corrected using the zoom position correction value Zc, and the zoom unit 111 is turned on. Drive to position.

  Next, in S509, the output of the focus part origin position detecting means 110 is judged, and the focus part 108 is driven to the infinite side when the level is low and to the near side when the level is high. Here, the output signal of the focus part origin position detection means 110 outputs a low level when the position of the focus part 108 is close to a predetermined origin position, and outputs a high level when it is on the infinity side. It is assumed that it is set as follows.

In S510, it is determined whether or not the focus unit origin position detection unit 110 has detected the origin. If the origin has not been detected, the process returns to S509 and continues to drive the focus unit 108 in the direction of the origin until the origin position is detected. . In S510, when the focus unit origin position detection unit 110 detects the origin, the process proceeds to S511, and immediately the drive of the focus unit 108 is stopped, and the process proceeds to S512. In S512, the absolute position Fo at the focus portion origin is read from the nonvolatile memory 114, and the focus position correction value Fc is calculated using the equation (52).
Fc = FPos−Fo (52)

  Further, in S513, the absolute position Fo at the origin of the focus unit is set in the counter FPos of the focus unit position detection unit 109. In S514, the focus unit control data is corrected using the zoom position correction value Fc, and the focus unit 108 is turned on. Drive until.

  In S515, the image blur correction limit value corresponding to the zoom position / focus position is read from the nonvolatile memory 114 and set to the limit value Llimit.

Since S111 to S124 are the same as those in the first embodiment, description thereof will be omitted.
Thereafter, the image blur correction control unit 115 repeatedly executes S111 to S124 and S515 until the power of the zoom lens 100 with the image blur correction function is turned off.

  Thus, immediately after turning on the power, the zoom unit 111 and the focus unit 108 are forcibly moved to detect the origin position, and the zoom unit position detection unit 112 and the focus unit position detection unit 109 are initialized, thereby turning on the power. Immediately after that, it is possible to perform image blur correction that can reduce the influence of the decrease in peripheral light amount.

[Example 6]
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 10 is a configuration diagram of a zoom lens with an image blur correction function in a sixth embodiment to which the present invention can be applied. The zoom lens with an image blur correction function according to the sixth embodiment includes a zoom lens 300 and an adapter 400 with an image blur correction function connected between the zoom lens 300 and a camera (not shown).

The zoom lens 300 includes a focus unit 301, a focus unit position detection unit 302 for detecting the position of the focus unit 301, and a focus unit origin position detection unit 303 for detecting the origin position of the focus unit 301.
The zoom lens 300 further includes a zoom unit 304, a zoom unit position detection unit 305 for detecting the position of the zoom unit 304, a zoom unit origin position detection unit 306 for detecting the origin position of the zoom unit 304, and a focal length. It includes an IE (Internal Extender) unit 307 that can insert and remove one or more optical systems to be enlarged on the optical axis, and an IE unit position detection unit 308 for detecting a setting state of the IE unit 307. Further, a focus control unit 301, a zoom unit 304, an IE unit 307, and a lens control unit 309 for controlling an iris (not shown) and the like are provided.

  An adapter 400 with an image blur correction function includes a vibration sensor 401 for detecting vibration applied to the adapter 400 with an image blur correction function, a high-pass filter 402 for removing a DC component contained in an output signal of the vibration sensor 401, It has an amplifier 403 for amplifying the output of the high pass filter 402 to an appropriate level. The A / D converter 404 converts the analog output signal from the amplifier 403 into digital data.

  The image blur correction lens group 405 decenters the optical axis of the adapter 400 with an image blur correction function. The actuator 406 drives the image blur correction lens group 405, and the position detection unit 407 detects the position of the image blur correction lens group 405. The nonvolatile memory 408 stores coefficients necessary for calculating image blur correction control data.

  An image blur correction control unit 409 outputs image blur correction control data using output data from the A / D converter 404, output data from the zoom unit position detection unit 305, coefficients stored in the nonvolatile memory 408, and the like. Calculate.

  The D / A converter 410 converts the output data from the image blur correction control unit 409 into an analog signal, and the drive circuit 411 drives the actuator 406 based on the output signal from the D / A converter 410.

  FIG. 11 is a flowchart showing a series of operations of the image blur correction control unit 409 in the present embodiment. In FIG. 11, the same processes as those in the first embodiment are denoted by the same reference numerals as those in FIG. In this embodiment, the IE group is arranged on the object side of the image blur correction lens group 405. Therefore, the current position of the IE section is read in S601, and the process proceeds to S602. In S602, in order to obtain the image blur correction control data calculation coefficient, the coefficient is calculated using the position of the IE section as a parameter in addition to the zoom position and the focus position. Since other processes are the same as those in the first embodiment, description thereof will be omitted.

  Thereafter, the image blur correction control unit 409 repeatedly executes S103 to S121 and S601 to S602 until the power of the adapter 400 with the image blur correction function is turned off.

  With such a configuration, it is possible to perform image blur correction that can reduce the influence of a decrease in the amount of peripheral light immediately after the power is turned on.

  As described above, in Embodiments 1 to 6, the zoom unit origin position detection unit that detects the origin position of the zoom unit is illustrated separately from the zoom unit position detection unit that detects the relative position of the zoom unit. However, the present invention is not limited to this configuration, and the zoom unit position detection unit and the zoom unit origin position detection unit may be configured integrally. In addition, although illustrated as a configuration having a focus unit origin position detection unit that detects the origin position of the focus unit separately from the focus unit position detection unit that detects the relative position of the focus unit, the present invention has this configuration. There is no limitation, and the focus part position detection part and the focus part origin position detection part may be integrated, and this structure also reduces the influence of a decrease in the amount of peripheral light immediately after the power is turned on. You can enjoy the effect.

  In the illustrated embodiment, the zoom unit origin position detection unit 113 and the focus unit origin position detection unit 110 have two different levels depending on the positions of the zoom unit and the focus unit relative to the origin position (one reference position). In this way, the position determination with respect to the origin position (detection of the reference position), the detection of the origin position, and the like are performed. However, the present invention is not limited to this configuration, and each of the zoom unit and the focus unit includes a plurality of reference positions and a reference position detection unit that outputs a plurality of levels of signals different from each other. It should be noted that the same effects as those of the present invention can be obtained.

100 Zoom lens with image blur correction function 105 Image blur correction lens group 106 Actuator 107 Position detection unit 111 Zoom unit 112 Zoom unit position detection unit 113 Zoom unit origin position detection unit 115 Image blur correction control unit 117 Drive circuit

Claims (9)

A lens barrel,
A zoom lens group held in the lens barrel so as to be movable in the optical axis direction;
Said arranged on the image plane side of the zoom lens unit, an image held in the barrel to be movable in a direction perpendicular to the optical axis blur compensating lens unit,
A zoom position detecting means for detecting the relative position in the optical axis direction with respect to the lens barrel of the zoom lens group,
And control means for controlling the driving of said image blur correction lens group in accordance with the vibration of the zoom lens system,
An initialization determination means the position of the zoom lens group said zoom position detecting means for detecting it is determined whether or not initialized,
Origin position detection means for outputting different signals depending on whether the zoom lens group is on the wide-angle side or the telephoto side with respect to a predetermined origin position;
A zoom lens having
In the case where the zoom position detecting unit is initialized , the control unit is configured to reduce the image blur correction lens within a predetermined maximum driving amount range of the correction lens group which is set to be larger as the focal length is longer. controls the driving of the group, it said in a case where the zoom position detecting means is not initialized, if the output from the home position detecting means indicates a wide-angle side from the home position to indicate telephoto side than the home position Setting a larger maximum driving amount of the correction lens group, and controlling driving of the image blur correction lens group;
A zoom lens characterized by that. The zoom lens further includes position storage means for storing the position of the zoom lens group when the power is turned off,
In the case where the zoom position detecting means has not been initialized, the control means, the image in an image blur correction characteristics according to the position of the zoom lens group when the power stored in the position storage means is cut Control the drive of the image stabilization lens group,
The zoom lens according to claim 1, characterized in that. The zoom lens further includes a movement direction detection unit that detects a direction in which the zoom lens group moves.
When the zoom position detection unit is not initialized, the control unit controls movement of the image blur correction lens group with an image blur correction characteristic based on a direction in which the zoom lens group moves.
The zoom lens according to claim 1.   4. The zoom lens according to claim 1, wherein the zoom position detection unit includes the origin position detection unit for detecting the origin position of the zoom lens group. 5.   A lens barrel,
  A zoom lens group held in the lens barrel so as to be movable in the optical axis direction;
  An image blur correction lens group disposed on the image plane side of the zoom lens group and held in the lens barrel so as to be movable in a direction perpendicular to the optical axis;
  Zoom position detecting means for detecting a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel;
  Control means for controlling the driving of the image blur correction lens group according to the vibration of the zoom lens device;
  Initialization determining means for determining whether or not the position of the zoom lens group detected by the zoom position detecting means has been initialized;
  Origin position detection means for outputting different signals depending on whether the zoom lens group is on the wide-angle side or the telephoto side with respect to a predetermined origin position;
A zoom lens having
  In the case where the zoom position detection unit is initialized, the control unit is configured to reduce the image blur correction lens group within a predetermined maximum drive amount range of the correction lens group that is set to be larger as the focal length is longer. In the case where the zoom position detection means is not initialized, the maximum movement amount of the image blur correction lens group is determined when the position of the zoom lens group is on the wide angle side with respect to the origin position. The zoom lens group is set to the maximum movement amount when the position of the zoom lens group is at the wide-angle end, and when the position of the zoom lens group is on the telephoto side with respect to the origin position, the position of the zoom lens group is the origin position. Set to the maximum amount of movement for
A zoom lens characterized by that.   A lens barrel,
  A zoom lens group held in the lens barrel so as to be movable in the optical axis direction;
  An image blur correction lens group disposed on the image plane side of the zoom lens group and held in the lens barrel so as to be movable in a direction perpendicular to the optical axis;
  Zoom position detecting means for detecting a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel;
  Control means for controlling the driving of the image blur correction lens group according to the vibration of the zoom lens device;
  Initialization determining means for determining whether or not the position of the zoom lens group detected by the zoom position detecting means has been initialized;
  Origin position detection means for outputting different signals depending on whether the zoom lens group is on the wide-angle side or the telephoto side with respect to a predetermined origin position;
A zoom lens having
  In the case where the zoom position detection unit is initialized, the control unit is configured to reduce the image blur correction lens group within a predetermined maximum drive amount range of the correction lens group that is set to be larger as the focal length is longer. When the zoom position detecting means is not initialized, the zoom lens group is moved to the telephoto side, moved to the wide angle side, not moved, On the other hand, the maximum movement amount of the image blur correction lens groups different from each other is set and the drive is controlled.
A zoom lens characterized by that. Lens device,
A lens barrel, a zoom lens group held in the lens barrel so as to be movable in the optical axis direction, and a zoom position detecting means for detecting a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel; a zoom lens having an initialization determination means the position of the zoom lens in which the zoom position detection means detects it is determined whether or not initialized,
And image blur correction lens group for correcting an image blur by moving in a direction perpendicular to the optical axis, and the image blur control means for controlling the driving of said image blur correction lens group in response to vibration of the lens system, the zoom lens group is in the case in the telephoto side when in the wide-angle side relative to a predetermined origin position, a image blur correcting function adapter device having a home position detecting means for outputting a different signal, from the zoom lens An adapter device with an image blur correction function disposed on the image plane side;
With
When the zoom position detecting unit is initialized , the image blur control unit corrects the image blur within a predetermined maximum driving amount range of the correction lens group that is set to be larger as the focal length is longer. It controls the driving of the lens group, in a case where the position detecting means is not initialized, than when the output from the home position detecting means indicates a wide-angle side from the home position to indicate telephoto side than the home position Setting a large maximum driving amount of the correction lens group, and controlling driving of the image blur correction lens group;
A lens device.   The lens device
  A lens barrel, a zoom lens group held in the lens barrel so as to be movable in the optical axis direction, and a zoom position detecting means for detecting a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel; An initialization discriminating unit for discriminating whether or not the position of the zoom lens group detected by the zoom position detecting unit is initialized;
  An image blur correction lens group that moves in a direction perpendicular to the optical axis to correct image blur, an image blur control unit that controls driving of the image blur correction lens group according to vibration of the lens device, and the zoom lens An adapter device with an image blur correction function having origin position detecting means for outputting different signals depending on whether the group is on the wide-angle side or the telephoto side with respect to a predetermined origin position, An adapter device with an image blur correction function disposed on the image plane side;
With
  When the zoom position detecting unit is initialized, the image blur control unit corrects the image blur within a predetermined maximum driving amount range of the correction lens group that is set to be larger as the focal length is longer. When the driving of the lens group is controlled and the zoom position detecting means is not initialized, the maximum movement amount of the image blur correcting lens group is set so that the position of the zoom lens group is on the wide angle side with respect to the origin position. The zoom lens group is set to the maximum movement amount when the position of the zoom lens group is at the wide-angle end, and when the position of the zoom lens group is on the telephoto side with respect to the origin position, the position of the zoom lens group is Set the maximum movement amount when it is at the origin position.
A lens device.   The lens device
  A lens barrel, a zoom lens group held in the lens barrel so as to be movable in the optical axis direction, and a zoom position detecting means for detecting a relative position of the zoom lens group in the optical axis direction with respect to the lens barrel; An initialization discriminating unit for discriminating whether or not the position of the zoom lens group detected by the zoom position detecting unit is initialized;
  An image blur correction lens group that moves in a direction perpendicular to the optical axis to correct image blur, an image blur control unit that controls driving of the image blur correction lens group according to vibration of the lens device, and the zoom lens An adapter device with an image blur correction function having origin position detecting means for outputting different signals depending on whether the group is on the wide-angle side or the telephoto side with respect to a predetermined origin position, An adapter device with an image blur correction function disposed on the image plane side;
With
  When the zoom position detecting unit is initialized, the image blur control unit corrects the image blur within a predetermined maximum driving amount range of the correction lens group that is set to be larger as the focal length is longer. In the case where the lens group drive is controlled and the position detection unit is not initialized, the zoom lens group is moved to the telephoto side, is moved to the wide angle side, is not moved, For each, a maximum movement amount of the image blur correction lens group different from each other is set and driving is controlled.
A lens device.

Images