JP6519232B2 - Imaging apparatus, imaging method, program and optical apparatus - Google Patents

Description

  The present invention is an imaging apparatus and an imaging method for obtaining an optical low-pass filter effect by driving a moving member so as to draw a predetermined locus in a plane (for example, in an optical axis orthogonal plane) intersecting the optical axis of the imaging optical system. And the program. Further, according to the present invention, an optical apparatus (for example, a DMD element used in a plane orthogonal to an optical axis) is driven while driving the moving optical element so as to draw a predetermined locus on a predetermined plane (a plane intersecting the incident light beam and the outgoing light beam). The present invention relates to a projector device) that projects while driving so as to draw a locus.

  In Patent Document 1, an image sensor (moving member) is driven so as to draw a predetermined locus (for example, a circular locus or a square locus) in an optical axis orthogonal plane, thereby allowing subject light flux to be incident on a plurality of pixels of the image sensor. There is disclosed an imaging device for obtaining an optical low-pass filter effect (removal effect of moiré and false color).

  The low pass filter effect is maximized when it can be driven as the target drive path the moving member should draw. On the other hand, when the moving member deviates from the target drive trajectory to be drawn (smaller, greater, distortion, etc. than the target drive trajectory), the low pass filter effect is weakened. Here, the target drive locus to be drawn by the moving member can be set by, for example, a low pass filter operation switch provided in the imaging device.

  In the prior art, the target drive locus (the target drive signal corresponding to that) that the moving member should draw and the actual drive locus that the moving member actually drawn (for the purpose of approaching the target drive locus even a little) General feedback control has been performed to make a comparison with the actual driving signal) to compensate for the difference.

JP, 2008-35241, A

  However, according to the intensive researches of the present inventor, in the above-mentioned prior art, the actual drive locus (the actual drive signal corresponding to it) is the target drive locus (the target drive locus corresponding to (the actual drive signal) It has been found that the signal does not follow with high accuracy and the desired low pass filter effect can not be obtained.

  In particular, when the moving member performs both the low pass filter drive and the image blur correction drive, the drive signal for the low pass filter drive (relatively high frequency band) and the drive signal for the image blur correction drive (relatively low) The above technical problems become even more pronounced because the frequency band is generally supplied from a single (common) controller.

  That is, according to the new knowledge of the inventor of the present invention, in the above-mentioned prior art, regardless of the appearance (viewpoint from the low-pass filter operation switch side setting the target drive locus) The reliability of the drive locus (the corresponding target drive signal) may be low, and even in such a case, the actual drive locus (the target drive signal corresponding to the low reliability target drive locus) (The actual drive signal) corresponding to

  The above technical problems include optical devices (for example, DMD elements) which are used while driving a moving optical element so as to draw a predetermined locus on a predetermined plane (on a plane intersecting the incident light beam and the outgoing light beam) other than the imaging device The same applies to a projector device) that projects while driving so as to draw a predetermined trajectory in an orthogonal plane.

  The present invention has been made based on the above-mentioned problem awareness, and causes the actual drive trajectory of the moving member (the actual drive signal corresponding thereto) to follow the target drive trajectory (the target drive signal corresponding thereto) with high accuracy. An object of the present invention is to obtain an imaging device, an imaging method and a program that can obtain a desired low pass filter effect. The present invention also provides an optical apparatus that can be used with high accuracy in accordance with the target drive locus (target drive signal corresponding to (actual drive signal corresponding to) the actual drive locus of the moving optical element. To aim.

An imaging apparatus according to the present invention moves at least one of an image sensor that converts an object image formed by an imaging optical system into an electrical pixel signal, an optical element forming at least a part of the imaging optical system, and the image sensor. As a member, by driving this moving member so as to draw a predetermined locus in a plane intersecting with the optical axis of the photographing optical system, an object light beam is made incident on a plurality of pixels of the image sensor, and an optical low pass is realized. And a drive signal generation unit configured to generate a drive signal for driving the movable member via the drive mechanism, the drive signal generation unit including a target to be drawn by the movable member. When the moving member is driven by a target drive signal input unit for inputting a target drive signal corresponding to a drive locus, and a target drive signal input to the target drive signal input unit An actual drive signal detection unit for detecting an actual drive signal corresponding to an actual drive locus actually drawn by the moving member; a target drive signal input to the target drive signal input unit; and the actual drive signal detection unit a comparing unit for comparing calculating an actual driving signal, based on the result of the comparison operation by the comparison operation unit, and the target drive signal parameter adjuster for adjusting a parameter of the target drive signal, wherein the moving member The predetermined locus drawn is a periodic locus defined by the movement of only the X direction, the Y direction only, or the combination of the X direction and the Y direction with respect to the X and Y directions orthogonal to each other in the plane. The comparison operation unit executes comparison operation of the target drive signal and the actual drive signal by averaging the actual drive signal when the moving member draws a predetermined locus in two or more cycles. To It is a symptom.

  Once the target drive signal parameter adjustment unit adjusts the parameters of the target drive signal, the moving member is driven when the actual drive signal detection unit drives the moving member by the target drive signal after parameter adjustment. A first step of detecting an actual drive signal corresponding to an actual drive locus actually drawn, and an initial target drive signal input to the target drive signal input unit by the comparison operation unit and the actual drive signal detection unit A second step of comparing and calculating the actual drive signal, and a third step of re-adjusting the parameter of the target drive signal based on the result of the comparison operation by the comparison operation unit. You can repeat the processing loop you have.

  The comparison operation unit calculates the difference between the target drive signal input to the target drive signal input unit and the actual drive signal detected by the actual drive signal detection unit, and the target drive signal parameter adjustment unit is the comparison operation unit When the difference between the target drive signal and the actual drive signal exceeds the predetermined value as a result of the comparison operation by the parameter, the parameter of the target drive signal is adjusted, and the difference between the target drive signal and the actual drive signal exceeds the predetermined value. If not, this can be maintained without adjusting the parameters of the target drive signal.

  The imaging apparatus of the present invention may further include a target drive signal holding unit that holds the adjusted target drive signal each time the target drive signal parameter adjustment unit adjusts a parameter of the target drive signal.

  The target drive signal held by the target drive signal holding unit can be used when the movement of the moving member is ended and restarted.

  When the comparison operation unit compares the target drive signal with the actual drive signal, the difference between the amplitudes of X component sine waves corresponding to the movement of the moving member in the X direction in the plane, the difference in the plane The difference in phase of an X component sine wave corresponding to the movement of the moving member in the X direction, the difference in amplitude of a Y component sine wave corresponding to the movement of the moving member in the Y direction in the plane, and the difference in the plane The difference in phase of the Y component sine wave corresponding to the movement of the moving member in the Y direction can be calculated.

  The target drive signal parameter adjustment unit adjusts an amplitude of an X component sine wave corresponding to movement of the moving member in the X direction in the plane when adjusting the parameter of the target drive signal; An X phase adjustment unit that adjusts the phase of an X component sine wave corresponding to the movement of the moving member in the X direction in the plane, and a Y component sine wave corresponding to the movement of the moving member in the Y direction in the plane It is possible to have a Y amplitude adjustment unit that adjusts the amplitude, and a Y phase adjustment unit that adjusts the phase of a Y component sine wave that corresponds to the movement of the moving member in the Y direction in the plane.

  The predetermined trajectory drawn by the moving member is circular motion in the plane, and the target drive signal input to the target drive signal input unit is the X component sine wave having the same amplitude and 90 ° out of phase with each other. The Y component sine wave can be added.

  The comparison operation unit holds or refers to a plurality of comparison operation expressions for the target drive signal parameter adjustment unit to adjust the parameters of the target drive signal, and any one of the plurality of comparison operation expressions It can be used selectively.

In the photographing method of the present invention, an image sensor for converting an object image formed by a photographing optical system into an electrical pixel signal, an optical element forming at least a part of the photographing optical system, and at least one of the image sensor are moved. As a member, by driving this moving member so as to draw a predetermined locus in a plane intersecting with the optical axis of the photographing optical system, an object light beam is made incident on a plurality of pixels of the image sensor, and an optical low pass is realized. An imaging method by an imaging apparatus, comprising: a drive mechanism for obtaining a filter effect; and a drive signal generation unit generating a drive signal for driving the moving member via the drive mechanism, the drive signal generation unit A target drive signal input step for inputting a target drive signal corresponding to a target drive locus to be drawn by the moving member; and an input at the target drive signal input step An actual drive signal detection step of detecting an actual drive signal corresponding to an actual drive locus drawn by the movable member when the movable member is driven by the target drive signal; and a target input in the target drive signal input step A target drive signal parameter for adjusting a parameter of the target drive signal based on a comparison operation step of comparing and calculating a drive signal and an actual drive signal detected in the actual drive signal detection step, and a comparison operation result in the comparison operation step The predetermined trajectory drawn by the movable member is an X direction, an X direction only, an Y direction only, or a combination of an X direction and a Y direction with respect to X and Y directions orthogonal to each other in the plane. It is a periodic locus specified by movement, and in the comparison operation step, actual driving when the moving member draws a predetermined locus in two or more cycles The drives out those averaged, executes a comparison operation of said target drive signal and the actual driving signal, and wherein the issue.

A program according to the present invention comprises an image sensor for converting an object image formed by a photographing optical system into an electrical pixel signal, an optical element forming at least a part of the photographing optical system, and at least one of the image sensor The subject light beam is made to be incident on a plurality of pixels of the image sensor by driving the moving member so as to draw a predetermined locus in a plane intersecting the optical axis of the photographing optical system, and an optical low pass filter It is a program for controlling an imaging device provided with a drive mechanism which produces an effect, and a drive signal generation part which generates a drive signal for driving the above-mentioned movement member via the drive mechanism, wherein the drive signal is generated. A target drive signal input step of inputting a target drive signal corresponding to a target drive locus to be drawn by the movable member to a computer constituting the unit; An actual drive signal detection step of detecting an actual drive signal corresponding to an actual drive locus actually drawn by the movable member when the movable member is driven by the target drive signal input in the target drive signal input step; The target drive signal based on the comparison operation step of comparing the target drive signal input in the target drive signal input step and the actual drive signal detected in the actual drive signal detection step, and the comparison operation in the comparison operation step A target drive signal parameter adjustment step of adjusting the parameters of (1), and the predetermined trajectory drawn by the moving member is X direction only, X direction only, Y direction only with respect to X, Y directions orthogonal to each other in the plane, or , And a periodic locus defined by the combined movement of the X direction and the Y direction, and in the comparison operation step, the moving member It drives out an average of the actual drive signal when depicting the constant trajectory 2 or more cycles to execute comparison operation of said target drive signal and the actual drive signals is characterized by.

The optical apparatus according to the present invention comprises a moving optical element, a drive mechanism for driving the moving optical element to draw a predetermined locus on a predetermined plane (on a plane intersecting the incident light beam and the outgoing light beam), and the drive mechanism. A drive signal generation unit for generating a drive signal for driving the movable optical element, the drive signal generation unit inputting a target drive signal corresponding to a target drive locus to be drawn by the movable optical element When the movable optical element is driven by a target drive signal input unit and a target drive signal input to the target drive signal input unit, an actual drive signal corresponding to an actual drive locus actually drawn by the movable optical element is detected , A comparison operation unit that compares the target drive signal input to the target drive signal input unit with the actual drive signal detected by the actual drive signal detection unit, and a ratio by the comparison operation unit Based on the result of the operation, the has a target drive signal parameter adjuster for adjusting a parameter of the target drive signal, the predetermined trajectory said mobile optical element draws is, X perpendicular to each other in the plane, the Y-direction In contrast, the periodic locus is defined by the movement of only the X direction, the Y direction only, or the combination of the X direction and the Y direction, and the comparison operation unit A comparison operation of the target drive signal and the actual drive signal is performed by averaging the actual drive signal at the time of drawing .

  According to the present invention, it is possible to obtain a desired low-pass filter effect by making the (actual driving signal corresponding to) the actual driving locus of the moving member follow the target driving locus (corresponding to the target driving signal) with high accuracy. An apparatus, a photographing method and a program are obtained. Furthermore, the present invention can provide an optical apparatus that can be used with high accuracy in accordance with the target drive locus (the target drive signal corresponding to the actual drive locus of the moving optical element).

FIG. 1 is a block diagram showing the main configuration of a digital camera according to a first embodiment of the present invention. FIG. 2 is a block diagram showing the main configuration of an image shake correction apparatus. FIG. 2 is a side view showing the configuration of the image shake correction apparatus. FIGS. 4A and 4B are diagrams showing an operation for giving an optical low-pass filter effect by driving the image sensor so as to draw a predetermined locus, and FIG. When the image sensor is driven so as to draw a rotationally symmetric square locus centered on the optical axis, FIG. 4B shows the image sensor so as to draw a rotationally symmetric circular locus centered on the optical axis of the photographing optical system. The driving cases are shown respectively. It is a functional block diagram showing composition of an image sensor drive circuit. FIGS. 6A and 6B are diagrams showing an example of an initial target drive trajectory and an initial target drive signal which are in a corresponding relationship with each other, respectively. FIGS. 7A and 7B are diagrams showing an example of an actual drive locus and an actual drive signal which are in a corresponding relationship to each other when the present invention is not applied. FIGS. 8A and 8B are diagrams showing another example of an actual drive locus and an actual drive signal which are in a corresponding relationship to each other when the present invention is not applied. FIGS. 9A and 9B are diagrams showing an X component sine wave and a Y component sine wave of a target drive signal after the present invention is applied and the parameter of the initial target drive signal is adjusted, respectively. FIGS. 10 (A) and 10 (B) are diagrams showing an actual driving locus when the image sensor is driven by the target driving signal after parameter adjustment in FIGS. 9 (A) and 9 (B) and an actual driving signal corresponding thereto. It is. FIGS. 11A and 11B are diagrams showing drive trajectories and drive signals corresponding to the drive trajectories according to the second embodiment of the present invention, wherein predetermined trajectories drawn by the image sensor are in the Y direction in the optical axis orthogonal plane. It corresponds to the case of linear reciprocating drive trajectory. It is a functional block diagram corresponding to FIG. 5 which shows a structure of the image sensor drive circuit of the digital camera by 3rd Embodiment of this invention. It is a block diagram corresponding to FIG. 2 which shows the structure of the drive mechanism of the optical apparatus (projector apparatus) by 4th Embodiment of this invention. It is a functional block diagram corresponding to FIG. 5, FIG. 12 which shows a structure of the drive signal production | generation part of the optical apparatus (projector apparatus) by 4th Embodiment of this invention. FIGS. 15A and 15B are diagrams showing an initial target drive trajectory of the DMD element and an initial target drive signal. FIGS. 16A and 16B are diagrams showing an actual drive locus and an actual drive signal of the DMD element when the present invention is not applied. FIGS. 17A and 17B are diagrams showing modified examples of the initial target drive trajectory of the DMD element and the initial target drive signal.

First Embodiment
A first embodiment of a digital camera (shooting device) 10 according to the present invention will be described with reference to FIGS. 1-10. The photographing method and program according to the present invention can be obtained by causing a computer constituting the image sensor drive circuit (drive signal generation unit) 60 to execute various processing steps.

  As shown in FIG. 1, the digital camera 10 includes a body main body 20 and a photographing lens 30 which is detachable (lens exchangeable) on the body main body 20. The photographing lens 30 includes, in order from the subject side (left side in FIG. 1) to the image plane side (right side in FIG. 1), a photographing lens group (photographing optical system, moving member, shake correction member) 31 and The photographing optical system) 32 is provided. The body body 20 includes a shutter (shooting optical system) 21 and an image sensor (moving member, shake correction member) 22 in order from the subject side (left side in FIG. 1) to the image plane side (right side in FIG. 1). And have. Further, the body main body 20 is provided with an aperture / shutter drive circuit 23 for driving and controlling the aperture 32 and the shutter 21 in a state of being attached to the photographing lens 30. A subject image formed by subject light flux incident from the taking lens group 31 and passing through the diaphragm 32 and the shutter 21 is formed on the light receiving surface of the image sensor 22. An object image formed on the light receiving surface of the image sensor 22 is converted into an electrical pixel signal by a large number of pixels arranged in a matrix, and is output to the DSP 40 as image data. The DSP 40 performs predetermined image processing on the image data input from the image sensor 22, displays the image data on the LCD 24, and stores the image data in the image memory 25. In FIG. 1, although the imaging lens group 31 is drawn to be a single lens, the actual imaging lens group 31 may be, for example, a fixed lens, a variable magnification lens which moves at the time of zooming, and a focusing lens which moves at the time of focusing. Etc. It consists of a plurality of lenses.

  The photographing lens 30 has a communication memory 33 storing various information such as resolution (MTF) information of the photographing lens group 31 and aperture diameter (aperture value) information of the diaphragm 32. In a state where the taking lens 30 is attached to the main body 20, various information stored in the communication memory 33 is read into the DSP 40.

  The body main body 20 is connected to the DSP 40 and provided with a photographing operation switch 26. The photographing operation switch 26 includes various switches such as a power switch and a release switch.

  The body main body 20 is connected to the DSP 40 and includes a low pass filter operation switch 27. The low-pass filter operation switch 27 operates a low-pass filter to drive the image sensor 22 so as to draw a predetermined locus in a plane orthogonal to the optical axis Z of the photographing optical system (hereinafter sometimes referred to as an optical axis orthogonal plane). These switches are used to switch on / off the switch, to perform various settings related to the low-pass filter operation, and the like.

  The low-pass filter operation switch 27 outputs a target drive locus to be drawn by the image sensor 22 and a target drive signal corresponding thereto to an image sensor drive circuit (drive signal generation unit) 60 described later via the DSP 40. The target drive trajectory and the target drive signal output from the low-pass filter operation switch 27 are an initial target drive trajectory and an initial target drive signal that serve as a reference (absolute reference) of a control target by the image sensor drive circuit 60.

  The low pass filter operation of the image sensor 22 and what kind of control the image sensor drive circuit 60 performs based on the initial target drive locus and the initial target drive signal input from the low pass filter operation switch 27 will be described in detail later. Do.

  The body main body 20 is connected to the DSP 40 and includes a gyro sensor (shake detection unit) 28. The gyro sensor 28 detects a movement angular velocity (around the X-axis and the Y-axis) applied to the body body 20 to detect a shake detection signal indicating a shake of the body body 20 in a plane orthogonal to the optical axis.

  As shown in FIGS. 1 to 3, the image sensor 22 can move within a plane including the X-axis direction and the Y-axis direction (two orthogonal directions) orthogonal to the optical axis Z of the photographing optical system. Drive mechanism) 50 is mounted. The image shake correction apparatus 50 includes a fixed support substrate 51 fixed to a structure such as a chassis of the body 20, a movable stage 52 fixed to the image sensor 22, fixed with respect to the fixed support substrate 51, and a fixed support. The magnets M1, M2 and M3 fixed to the surface of the substrate 51 facing the movable stage 52, and the magnets M1 and M2 fixed to the fixed support substrate 51 so as to face the magnets M1, M2 and M3 with the movable stage 52 interposed therebetween. A drive for generating a driving force by receiving an electric current in the magnetic field of the magnetic circuit fixed to the movable stage 52 and the yokes Y1, Y2 and Y3 consisting of magnetic bodies constituting a magnetic circuit between M2 and M3 The coils C1, C2 and C3 are provided, and an alternating current drive signal (AC voltage) is flowed (applied) to the drive coils C1, C2 and C3 with respect to the fixed support substrate 51. Movable stage 52 (image sensor 22) is adapted to drive the optical axis orthogonal plane. An AC drive signal to be supplied to the drive coils C1, C2, C3 is generated by an image sensor drive circuit (drive signal generation unit) 60 described later under the control of the DSP 40. The configuration of the image sensor drive circuit 60 and the AC drive signal generated by the image sensor drive circuit 60 will be described in detail later.

  In the present embodiment, the magnetic drive means comprising the magnet M1, the yoke Y1 and the drive coil C1, and the magnetic drive means (two sets of magnetic drive means) comprising the magnet M2, the yoke Y2 and the drive coil C2 Are arranged at predetermined intervals in the longitudinal direction (horizontal direction, X-axis direction), and function as “X drive mechanism XDM (FIG. 5)”. In the short direction (vertical (vertical) direction, Y-axis direction) in which the magnetic drive means (one set of magnetic drive means) including the magnet M3, the yoke Y3 and the drive coil C3 is orthogonal to the longitudinal direction of the image sensor 22 It is arranged and functions as "Y drive mechanism YDM (Fig. 5)".

  Further, the magnetic force of the magnets M1, M2 and M3 is detected in the vicinity of the drive coils C1, C2 and C3 (central space portion) on the fixed support substrate 51 to make the optical axis orthogonal to the movable stage 52 (image sensor 22). Hall sensors H1, H2, and H3 that output (detect) a Hall output signal (position detection signal) indicating a position in a plane are disposed. The position and inclination (rotation) of the movable stage 52 (image sensor 22) in the Y-axis direction are detected by the Hall sensors H1 and H2, and the position of the movable stage 52 (image sensor 22) in the X-axis direction is detected by the Hall sensor H3. That is, the hall sensor H3 functions as an "X hall sensor", and the hall sensors H1 and H2 function as a "Y hall sensor".

  Hall sensors (X Hall sensor, Y Hall sensor) H1, H2, H3 are actually drawn by the image sensor 22 when the image sensor 22 is driven by the image blur correction device 50 (X drive mechanism XDM, Y drive mechanism YDM) It functions as an "actual drive signal detection unit" which detects an actual drive locus and an actual drive signal corresponding thereto.

  The DSP 40 receives a shake detection signal indicating a shake in the optical axis orthogonal plane of the body main body 20 detected by the gyro sensor 28 through an image sensor drive circuit (drive signal generation unit) 60 described later, and Hall sensors H1, H2, The image blur correction device 50 drives the image sensor 22 in the optical axis orthogonal plane on the basis of the hole output signal indicating the position in the optical axis orthogonal plane of the image sensor 22 output by H3. As a result, the imaging position of the subject image on the image sensor 22 can be displaced to correct the image blur caused by the camera shake. In this embodiment, this operation is referred to as "image blur correction operation (image blur correction drive) of the image sensor 22".

  The image blur correction apparatus 50 according to the present embodiment drives the image sensor 22 so as to draw a predetermined locus in a plane orthogonal to the optical axis Z of the photographing optical system, and a plurality of subject light fluxes are detected by the image sensor 22. An optical low-pass filter effect (hereinafter sometimes referred to as an LPF effect) is provided by making the light incident on the pixel of. In this embodiment, this operation is called "low-pass filter operation (LPF operation, LPF drive) of the image sensor 22".

  The image shake correction apparatus 50 according to the present embodiment performs “center holding operation of the image sensor 22 (center holding drive)” for holding the image sensor 22 at the center position of the image shake correction operation range (image shake correction drive range). Do. For example, when both the “image blur correction operation of the image sensor 22 (image blur correction drive)” and the “LPF operation (LPF drive) of the image sensor 22” are both off, “center holding operation of the image sensor 22 (center Shooting is performed with “drive only” turned on (center holding is performed even if image blur correction is not performed).

  "Image blur correction operation of the image sensor 22 (image blur correction drive)", "LPF operation of the image sensor 22 (LPF drive)" and "central holding operation of the image sensor 22 (central holding drive)" A mode realized by the image shake correction apparatus 50 as (synthetic drive) or a mode where only one of these operations (drive) is realized by the image shake correction apparatus 50 is possible.

  Referring to FIGS. 4A and 4B, an LPF operation will be described in which the image shake correction device 50 drives the image sensor 22 so as to draw a predetermined locus, and the image sensor 22 applies an LPF effect. In the figure, the image sensor 22 includes a large number of pixels 22a arranged at a predetermined pixel pitch P in a matrix on the light receiving surface, and one of the color filters R, G, B in Bayer arrangement on the front of each pixel 22a. Is arranged. Each pixel 22a detects the color of a subject light beam that has been transmitted through any of the front color filters R, G, B, that is, photoelectrically converts light of a color component (color band), and its intensity (luminance) Accumulate charge according to).

  FIG. 4A shows a case where the image sensor 22 is driven so as to draw a rotationally symmetrical square locus centering on the optical axis Z of the photographing optical system. This square locus can be, for example, a square closed path whose one side is the pixel pitch P of the image sensor 22. In FIG. 4A, the image sensor 22 is arranged with one pixel pitch P in the Y-axis direction parallel to one (vertical direction) parallel to the mutually perpendicular alignment direction of the pixels 22a, and in the X-axis direction parallel to the other (horizontal direction). Are moved alternately and in a square path.

FIG. 4B shows a case where the image sensor 22 is driven so as to draw a circular locus that is rotationally symmetric about the optical axis Z of the photographing optical system. This circular locus can be a circular closed path having a radius r equal to ^21⁄2 / 2 times the pixel pitch P of the image sensor 22.

  As shown in FIGS. 4A and 4B, when the image sensor 22 is driven to draw a predetermined square or circular locus during exposure, light is incident on the centers of the color filters R, G, and B (pixels 22a). Since the subject light rays (light fluxes) uniformly enter the four color filters R, G, B, and G, the same effect as the optical low pass filter can be obtained. That is, since any light filter incident on any color filter R, G, B, G (pixel 22a) is always incident on the color filters R, G, B, G (pixel 22a) in its periphery, so an optical low-pass filter An effect (LPF effect) equivalent to that of passing a light beam is obtained.

Furthermore, the drive range of the image sensor 22 is switched in stages (the length of one side is made different in the case of a square locus, and the radius r is made different in the case of a circular locus). It can be switched in stages. That is, one side of the square locus or the radius r of the circular locus is increased (the range of the pixel 22a incident on the pixels 22a (color filters R, G, B, G) different in detection color of the image sensor 22 By enlarging, the LPF effect is intensified, while the radius r of one side of a square locus or a circular locus is shortened (the pixels 22a (color filters R, G, B different in detection color of the image sensor 22 on which subject light rays are incident) , G) reduces the range of the pixel 22a that is incident), thereby weakening the LPF effect. As shown in Table 1, in the present embodiment, the drive range of the image sensor 22 and the LPF effect can be switched in four stages of “OFF”, “small”, “medium”, and “large”. When the drive range of the image sensor 22 and the LPF effect are "OFF", it means that the image sensor 22 is not driven and therefore the LPF effect can not be obtained.

  The drive range of the image sensor 22 and the switching of the LPF effect can be performed, for example, by manually operating the low-pass filter operating switch 27 or automatically by the DSP 40 based on various imaging condition parameters. There is freedom.

  As shown in FIG. 1, FIG. 2 and FIG. 5, the digital camera 10 generates an alternating current drive signal and sends it to the drive coils C1, C2 and C3 so that the image sensor via the image blur correction device 50 An image sensor driving circuit 60 is provided which drives the LPF 22 so as to draw a predetermined locus in a plane orthogonal to the optical axis. The overall operation of the image sensor drive circuit 60 is controlled by the DSP 40.

  The image sensor drive circuit 60 has a movement target value input unit (target drive signal input unit) 100. The movement target value input unit 100 receives an initial target drive locus and an initial target drive signal as a reference (absolute reference) of a control target by the image sensor drive circuit 60 from the low pass filter operation switch 27 via the DSP 40.

  FIGS. 6A and 6B respectively show an example of an initial target drive trajectory and an initial target drive signal which are in a corresponding relationship with each other.

  As shown in FIG. 6A, the “initial target drive trajectory” in the present embodiment is a circular motion in a plane orthogonal to the optical axis of a diameter 6AD (corresponding to 6 μm).

  As shown in FIG. 6B, the “initial target drive signal” in the present embodiment has the same frequency at 50 Hz, the same amplitude at ± 3 AD (corresponding to 3 μm), and a 90 ° phase shift. It is the sum of the X component sine wave and the Y component sine wave. The amplitude and phase of the X component sine wave correspond to the movement of the image sensor 22 in the X direction in the optical axis orthogonal plane. The amplitude and phase of the Y component sine wave correspond to the movement of the image sensor 22 in the Y direction in the optical axis orthogonal plane.

  The image sensor drive circuit 60 includes an X amplitude adjustment unit 110 that adjusts the amplitude of the X component sine wave, a Y amplitude adjustment unit 120 that adjusts the amplitude of the Y component sine wave, and an X phase adjustment unit that adjusts the phase of the X component sine wave. 130 and Y phase adjustment section 140 which adjusts the phase of the Y component sine wave. The X amplitude adjustment unit 110, the Y amplitude adjustment unit 120, the X phase adjustment unit 130, and the Y phase adjustment unit 140 adjust parameters of the initial target drive signal input to the movement target value input unit 100. Function as

  The initial target drive signal input to the movement target value input unit 100 is separated into an X component sine wave (X movement target value [AD]) and a Y component sine wave (Y movement target value [AD]). The X component sine wave passes through the X phase adjustment unit 130 and the X amplitude adjustment unit 110 without being subjected to any processing, is converted into an X drive signal [V] by the X controller 150, and is converted to an X drive mechanism XDM. It is input. The Y component sine wave passes through the Y phase adjustment unit 140 and the Y amplitude adjustment unit 120 without being subjected to any processing, is converted into a Y drive signal [V] by the Y controller 160, and is converted to the Y drive mechanism YDM. It is input. As a result, the image sensor 22 is LPF driven in the plane orthogonal to the optical axis by the image shake correction device 50 (X drive mechanism XDM, Y drive mechanism YDM).

  At this time, when the image sensor 22 is driven by the initial target drive signal input to the movement target value input unit 100, the X-hole sensor H3 and the Y-hole sensors H1 and H2 (actual drive signal detection unit) The actual drive locus drawn in and the actual drive signal corresponding to this are detected. More specifically, the X Hall sensor H3 detects the X component sine wave of the actual drive signal, and this is A / D converted by the A / D converter 170, and the Y Hall sensors H1 and H2 are Y component sine of the real drive signal. A wave is detected and A / D converted by the A / D converter 180. As a result, the X position [AD] and the Y position [AD] of the image sensor 22 can be recognized.

  Now, when the present invention is not applied (that is, when the conventional general feedback control is executed), the actual drive locus detected by the X Hall sensor H3 and the Y Hall sensors H1 and H2 (actual drive signal detection unit) and this Note the actual drive signal corresponding to

  FIGS. 7A and 7B respectively show an example of an actual drive locus and an actual drive signal which are in a mutually corresponding relationship when the present invention is not applied. As apparent from the figure, the actual drive locus (actual drive signal) can not follow the initial target drive locus (initial target drive signal), and a desired low pass filter effect is not obtained. More specifically, although the actual drive trajectory maintains circular motion, its diameter has become smaller to a diameter of 4 AD (corresponding to 4 μm) (FIG. 7 (A)), and the actual drive signal is an initial target drive signal. Although the same frequency and phase difference are maintained, the amplitude is reduced to ± 2 AD (corresponding to 2 μm).

  FIGS. 8A and 8B respectively show another example of an actual drive locus and an actual drive signal which are in a corresponding relationship to each other when the present invention is not applied. As apparent from the figure, the actual drive locus (actual drive signal) can not follow the initial target drive locus (initial target drive signal), and a desired low pass filter effect is not obtained. More specifically, the actual drive locus has become an ellipse (FIG. 8A), and although the actual drive signal maintains the same frequency and amplitude as the initial target drive signal, its phase difference is up to 110 °. It's getting bigger. If the actual drive locus is elliptical, the moiré removal performance is likely to be degraded because it has anisotropy.

  The problems shown in FIGS. 7A, 7B, 8A, and 8B are, for example, in the low frequency band of 1 Hz to 20 Hz in addition to the effects of manufacturing errors, environmental changes, and aging. It is considered that the cause is that it is designed to be able to correct a human shake. That is, the X controller 150 and the Y controller 160 according to the present embodiment handle both the drive signal (relatively high frequency band) for driving the LPF and the drive signal (relatively low frequency band) for the image blur correction drive. Because it is (supplied), it becomes difficult for the actual drive locus (actual drive signal) to follow the initial target drive locus (initial target drive signal).

  The present invention has been completed by regarding the above problems as an important technical problem. That is, in the present invention, it is assumed in advance that the image sensor 22 may not move according to the initial target drive locus (initial target drive signal), and the initial target drive locus (initial target drive signal) is generated in the control system. By setting the target drive locus (target drive signal) obtained by adjusting the parameters of) and making the image drive 22 follow the target drive locus (target drive signal) after this parameter adjustment, as a result, the initial target drive locus ( Drive according to the initial target drive signal). The configuration for realizing this will be specifically described below.

  The image sensor drive circuit 60 includes an X amplitude comparison operation unit 115 and a Y amplitude comparison operation unit 125.

  The X amplitude comparison operation unit 115 calculates the difference between the amplitude of the X component sine wave of the initial target drive signal and the amplitude of the X component sine wave of the actual drive signal to obtain the ratio. In the example of FIG. 6B and FIG. 7B, the X amplitude comparison operation unit 115 is the amplitude of 6AD which is the amplitude of the X component sine wave of the initial target drive signal and the amplitude of the X component sine wave of the actual drive signal. The ratio to 4 AD, that is, 6/4 (= 1.5 times) is determined. The value “1.5 times” is output to the X amplitude adjustment unit 110 as an amplification value for calculating the X target adjustment value [AD]. The “1.5 times” amplification value obtained here may be multiplied by a gain as necessary. As a result, it is possible to shorten the time until the actual drive locus (actual drive signal) follows the initial target drive locus (initial target drive signal).

  The X amplitude adjustment unit 110 multiplies the value “1.5 times” from the X amplitude comparison operation unit 115 by 6 AD which is the amplitude of the X component sine wave of the initial target drive signal to obtain 6 × 1.5 = 9 [ AD] obtains an amplified target value. The amplified target value is input to the X controller 150 via the X error operation unit 118, whereby the drive signal of the second loop is amplified, and the drive amount of the image sensor 22 in the X direction can be increased. .

  The Y amplitude comparison operation unit 125 calculates the difference between the amplitudes of the Y component sine wave of the initial target drive signal and the Y component sine wave of the actual drive signal to obtain the ratio. In the example of FIG. 6B and FIG. 7B, the Y amplitude comparison operation unit 125 is the amplitude of 6AD which is the amplitude of the Y component sine wave of the initial target drive signal and the amplitude of the Y component sine wave of the actual drive signal. The ratio to 4 AD, that is, 6/4 (= 1.5 times) is determined. The “1.5 times” value is output to the Y amplitude adjustment unit 120 as an amplification value for calculating the Y target adjustment value [AD]. The “1.5 times” amplification value obtained here may be multiplied by a gain as necessary. As a result, it is possible to shorten the time until the actual drive locus (actual drive signal) follows the initial target drive locus (initial target drive signal).

  The Y amplitude adjustment unit 120 multiplies the value “1.5 times” from the Y amplitude comparison operation unit 125 by 6 AD, which is the amplitude of the Y component sine wave of the initial target drive signal, to obtain 6 × 1.5 = 9 [ AD] obtains an amplified target value. The amplified target value is input to the Y controller 160 via the Y error calculation unit 128, whereby the drive signal of the second loop is amplified, and the drive amount of the image sensor 22 in the Y direction can be increased. .

  The image sensor drive circuit 60 includes an X phase acquisition unit 135, a Y phase acquisition unit 145, and a phase adjustment amount calculation unit 190.

  The X phase acquisition unit 135 acquires the phase of the X component sine wave of the actual drive signal, and outputs this to the phase adjustment amount calculation unit 190. The Y phase acquisition unit 145 acquires the phase of the Y component sine wave of the actual drive signal, and outputs this to the phase adjustment amount calculation unit 190.

  The phase adjustment amount calculation unit 190 calculates the difference (deviation) between the phase of the X component sine wave of the initial target drive signal and the phase of the X component sine wave of the actual drive signal input from the X phase acquisition unit 135. In the example of FIG. 6B and FIG. 8B, the phase adjustment amount calculation unit 190 is 20 ° (110 °) which is the difference (deviation) between the phase of the initial target drive signal and the X component sine wave of the actual drive signal. −90 °). The value of “20 °” is output to the X phase adjustment unit 130 to perform phase adjustment.

  The phase adjustment amount calculation unit 190 calculates the difference (deviation) between the phase of the Y component sine wave of the initial target drive signal and the phase of the Y component sine wave of the actual drive signal input from the Y phase acquisition unit 145. In the example of FIG. 6B and FIG. 8B, the phase adjustment amount calculation unit 190 is 20 ° (110 °) which is the difference (deviation) between the phases of the initial target drive signal and the Y component sine wave of the actual drive signal. −90 °). The value of “20 °” is output to the Y phase adjustment unit 140 to perform phase adjustment.

  The X phase acquisition unit 135 and the Y phase acquisition unit 145 each count the timing at which the peak value is taken out of the output that changes from moment to moment, and the phase adjustment amount computation unit 190 calculates the difference (deviation) of the timing. By comparing this with the target 90 °, the adjustment amount of the phase of the X component sine wave and the Y component sine wave can be calculated.

  As described above, the X amplitude comparison operation unit 115, the Y amplitude comparison operation unit 125, and the phase adjustment amount operation unit 190 are the initial target drive signal input to the movement target value input unit (target drive signal input unit) 100 and the X hole. The sensor H3 functions as a "comparison operation unit" that compares and calculates an actual drive signal detected by the Y Hall sensors H1 and H2 (actual drive signal detection unit). In addition, the X amplitude adjustment unit 110, the Y amplitude adjustment unit 120, the X phase adjustment unit 130, and the Y phase adjustment unit 140 adjust the parameters of the initial target drive signal based on the result of the comparison operation by the “comparison operation unit”. Function as a target drive signal parameter adjustment unit.

Once the target drive signal parameter adjustment unit (X amplitude adjustment unit 110, Y amplitude adjustment unit 120, X phase adjustment unit 130 and Y phase adjustment unit 140) once adjusts the parameters of the initial target drive signal, the following Step 1-Repeat the processing loop (adjustment operation after the second loop) having the third step.
[First step]
When an actual drive signal detection unit (hall sensors H1, H2, H3) drives the image sensor 22 by the target drive signal after parameter adjustment, an actual drive signal corresponding to the actual drive locus actually drawn by the image sensor 22 To detect.
[The second step]
The initial target drive signal input to the movement target value input unit (target drive signal input unit) 100 by the comparison operation unit (X amplitude comparison operation unit 115, Y amplitude comparison operation unit 125 and phase adjustment amount operation unit 190) The actual drive signals detected by the signal detection units (hall sensors H1, H2, and H3) are compared and calculated.
[Third step]
The target drive signal parameter adjustment unit (X amplitude adjustment unit 110, Y amplitude adjustment unit 120, X phase adjustment unit 130, and Y phase adjustment unit 140) performs comparison operation unit (X amplitude comparison operation unit 115, Y amplitude comparison operation unit 125). And the parameter of the target drive signal is readjusted based on the result of the comparison operation by the phase adjustment amount calculation unit 190).

  FIGS. 9A and 9B respectively show an X component sine wave and a Y component sine wave of a target drive signal after the present invention is applied and the parameter of the initial target drive signal is adjusted. As shown in the figure, the amplitude of the X component sine wave and the Y component sine wave of the target drive signal after parameter adjustment is amplified more than the X component sine wave and the Y component sine wave of the initial target drive signal.

  FIGS. 10A and 10B show an actual drive locus when the image sensor 22 is driven by the target drive signal after parameter adjustment in FIGS. 9A and 9B and an actual drive signal corresponding thereto. . As apparent from the figure, the actual drive locus (actual drive signal) follows the initial target drive locus (initial target drive signal) with high accuracy, and the desired low-pass filter effect is successfully obtained.

  In the X amplitude adjustment unit 110 and the Y amplitude adjustment unit 120, as a result of comparison operation by the X amplitude comparison operation unit 115 and the Y amplitude comparison operation unit 125, the difference between the amplitudes of the target drive signal and the actual drive signal is a predetermined value (for example, 1AD) The amplitude parameter of the target drive signal (X component sine wave and Y component sine wave) is adjusted, and the difference between the amplitude of the target drive signal and the amplitude of the actual drive signal does not exceed the predetermined value (for example, 1AD) When this is the case, this can be maintained without adjusting the amplitude parameter of the target drive signal (X component sine wave and Y component sine wave). According to this configuration, the amplitude parameter is adjusted only when the actual drive locus (actual drive signal) deviates significantly from the initial target drive locus (initial target drive signal), and the actual drive locus (actual drive signal) is initially Since the amplitude parameter is not adjusted when following the target drive locus (initial target drive signal) to some extent, unnecessary CPU calculation can be omitted, and it is possible to prevent the user from being disturbed.

  In the X phase adjustment unit 130 and the Y phase adjustment unit 140, as a result of the comparison operation by the phase adjustment amount calculation unit 190, the difference (deviation) between the phases of the target drive signal and the actual drive signal exceeds a predetermined value (for example, 10 °). When the target drive signal (X component sine wave and Y component sine wave) is adjusted, the difference (deviation) between the phase of the target drive signal and the actual drive signal exceeds a predetermined value (for example, 10 °). If not, this can be maintained without adjusting the phase parameter of the target drive signal (X component sine wave and Y component sine wave). According to this configuration, the phase parameter is adjusted only when the actual drive locus (actual drive signal) deviates largely from the initial target drive locus (initial target drive signal), and the actual drive locus (actual drive signal) is initially Since the phase parameter is not adjusted when following the target drive locus (initial target drive signal) to some extent, unnecessary CPU calculation can be omitted and it is possible to prevent the user from having trouble in use.

  Although not shown, in the image sensor drive circuit 60, the target drive signal parameter adjustment unit (X amplitude adjustment unit 110, Y amplitude adjustment unit 120, X phase adjustment unit 130 and Y phase adjustment unit 140) The target drive signal holding unit can hold the target drive signal (or the adjustment value itself) after the adjustment each time the parameter of the is adjusted. The target drive signal (or the adjustment value itself) held by the target drive signal holding unit restarts after the driving of the image sensor 22 is finished (including when the digital camera 10 is switched from the power off to the power on) Can be used). Of course, the target drive signal (or the adjustment value itself) held by the target drive signal holding unit may be reset (initialized) to zero when the driving of the image sensor 22 is ended or when the power of the digital camera 10 is turned off.

  The comparison operation unit (the X amplitude comparison operation unit 115, the Y amplitude comparison operation unit 125, and the phase adjustment amount operation unit 190) is an actual drive signal when the image sensor 22 draws a predetermined locus by one cycle, or The comparison calculation of the target drive signal and the actual drive signal can be executed by averaging the actual drive signal when the predetermined locus is drawn in two or more cycles. In the latter mode, the amplitude and phase are averaged to enable more stable parameter adjustment (without being adversely affected by waveform variations).

  The comparison operation unit (X amplitude comparison operation unit 115, Y amplitude comparison operation unit 125 and phase adjustment amount operation unit 190) is a target drive signal parameter adjustment unit (X amplitude adjustment unit 110, Y amplitude adjustment unit 120, X phase adjustment unit 130 and Y phase adjustment unit 140) can hold a plurality of comparison arithmetic expressions for adjusting the parameters of the target drive signal. Alternatively, a table (not shown) holding such a plurality of comparison arithmetic expressions is provided and used as the comparison arithmetic unit (X amplitude comparison arithmetic unit 115, Y amplitude comparison arithmetic unit 125, and phase adjustment amount arithmetic unit 190). You can refer to it. The comparison operation unit (X amplitude comparison operation unit 115, Y amplitude comparison operation unit 125, and phase adjustment amount operation unit 190) can selectively use any one of such a plurality of comparison operation expressions. . For example, in the above embodiment, the ratio of the amplitude of the target drive signal to that of the actual drive signal is determined, but not the ratio but the difference is directly input to the target value adjustment unit and added by the target value adjustment unit. An aspect is also possible.

Second Embodiment
FIGS. 11A and 11B show a second embodiment of a digital camera 10 according to the present invention. In the second embodiment, the predetermined locus drawn by the image sensor 22 is a linear reciprocating drive locus in the Y direction in the plane orthogonal to the optical axis (FIG. 11A). For this reason, the drive signal for driving the image sensor 22 includes only the Y component sine wave and does not include the X component sine wave (FIG. 11 (B)). According to the second embodiment, even if the parameter adjustment is performed, only the Y direction is performed, so that the calculation load on the CPU can be reduced.

Third Embodiment
FIG. 12 shows a third embodiment of a digital camera 10 according to the present invention. FIG. 12 of this third embodiment is a modification of FIG. 5 of the first embodiment in a form equivalent to this, and for the drive signal [V] input to the drive mechanism (XDM, YDM), A signal having “a voltage waveform assuming a predetermined movement” is directly input (added) between the controller (150, 160) and the drive signal adjustment unit (110, 120, 130, 140). Here, “voltage waveform assuming a predetermined movement” is a signal waveform for circular motion at 50 Hz, more specifically, the same at 50 Hz and the same amplitude at ± 3 AD (corresponding to 3 μm) It is assumed that the X component sine wave and the Y component sine wave which are 90 ° out of phase with each other are added. However, various design changes are possible for the "voltage waveform assuming a predetermined movement".

  In the first to third embodiments described above, the adjustment timings of the amplitude and the phase are not limited at the same time, and may be adjusted at different timings.

  In the first to third embodiments described above, the image sensor 22 is a moving member, and the aspect of driving the image sensor 22 in the plane orthogonal to the optical axis has been described as an example. It is not limited. For example, a voice coil motor (drive mechanism) provided with an optical element forming at least a part of the imaging lens group (imaging optical system) 31 as a “moving member” in the imaging lens 30 It is also possible to drive with the Alternatively, an aspect is also possible in which both of the image sensor 22 and the optical elements forming at least a part of the imaging lens group (imaging optical system) 31 are driven as “moving members” in an optical axis orthogonal plane. In any of the modes, the imaging position of the subject image on the image sensor 22 is displaced to correct the image blur, and the subject light flux is made incident on a plurality of pixels of different detected colors of the image sensor 22 Low-pass filter effect can be obtained.

  In the first to third embodiments described above, in order to execute the image blur correction operation and the LPF operation, the image sensor (moving member) 22 is placed on the plane orthogonal to the optical axis via the image blur correction device (drive mechanism) 50. The case of driving so as to draw a predetermined trajectory inside has been illustrated and described. However, the plane for driving the image sensor (moving member) 22 is not limited to this, and it may be a plane that intersects the optical axis of the imaging optical system.

  In the first to third embodiments described above, the image sensor 22 is driven by the image sensor 22 in the plane orthogonal to the optical axis via the single (common) image shake correction device (drive mechanism) 50. Although the case of performing the image blur correction operation and the LPF operation has been illustrated and described, it is also possible to independently provide a drive system for executing the LPF operation using a piezo drive device or the like.

  In the first to third embodiments described above, the DSP 40 and the image sensor driving circuit 60 are depicted as separate components (blocks), but an embodiment is also possible in which these are implemented as a single component (block). It is.

  In the first to third embodiments described above, the magnets M1, M2 and M3 and the yokes Y1, Y2 and Y3 are fixed to the fixed support substrate 51 as the configuration of the image shake correction apparatus (drive mechanism) 50, and the movable stage Although the case where the drive coils C1, C2, and C3 are fixed is illustrated and illustrated to 52, this positional relationship is reversed, the magnet and the yoke are fixed to the movable stage, and the drive coil is fixed to the fixed support substrate. Aspects are also possible.

  Although the above-described first to third embodiments illustrate and illustrate some of the predetermined trajectories drawn by the image sensor 22, the predetermined trajectories drawn by the image sensor 22 have a degree of freedom. That is, the predetermined trajectory drawn by the image sensor 22 is only in the X direction, only in the Y direction, or in the X direction with respect to X and Y directions orthogonal to each other in the optical axis orthogonal plane (or in the plane intersecting with the optical axis). It can be a periodic trajectory defined by the combination of motion in the Y and Y directions.

  In the above-described first to third embodiments, the aspect in which the body body 20 and the photographing lens 30 are detachable (lens exchangeable) has been described as an example, but the body body 20 and the photographing lens 30 can not be detached ( An embodiment in which the lenses can not be replaced is also possible.

Fourth Embodiment
In the first to third embodiments described above, the present invention is driven by drawing the moving member so as to draw a predetermined locus in a plane (for example, in a plane orthogonal to the optical axis) intersecting the optical axis of the photographing optical system. The case where the present invention is applied to an imaging apparatus, an imaging method, and a program for obtaining an optical low pass filter effect has been illustrated and described. However, the present invention can be applied to all the optical devices used while driving the moving optical element so as to draw a predetermined locus on a predetermined plane (on a plane intersecting the incident light beam and the outgoing light beam).

  FIGS. 13-17 show a fourth embodiment of such an optical instrument. In the fourth embodiment, the present invention is applied to a projector apparatus which projects while driving the DMD element 200 so as to draw a predetermined locus in an optical axis orthogonal plane.

  As shown in FIG. 13, the DMD element 200 is driven in a plane orthogonal to the optical axis by a drive mechanism 210 having the same configuration as the image shake correction apparatus 50 of the first embodiment to the third embodiment.

  FIG. 14 shows the configuration of a drive signal generation unit 220 that generates a drive signal for driving the DMD 200 in a plane orthogonal to the optical axis via the drive mechanism 210. The drive signal generation unit 220 basically rewrites FIG. 5 of the first embodiment in a form equivalent to this.

  FIGS. 15A and 15B show an initial target drive trajectory of the DMD element 200 and an initial target drive signal. As shown in FIG. 15A, the initial target drive trajectory of the DMD element 200 is a linear reciprocating drive trajectory that rises in the right in the figure across the X and Y directions in the plane orthogonal to the optical axis. As shown in FIG. 15B, the initial target drive signal of the DMD 200 is the sum of an X component sine wave and a Y component sine wave whose frequency, amplitude and phase are exactly the same.

  Here, when the present invention is not applied (that is, when the conventional general feedback control is performed), as shown in FIGS. 16A and 16B, the influence of a manufacturing error, an environmental change, a temporal change, etc. The actual drive locus (actual drive signal) of the DMD element 200 can not follow the initial target drive locus (initial target drive signal), and the resolution of the projection image by the projector device is reduced. As shown in FIG. 16 (A), the actual drive locus of the DMD element 200 is not a linear reciprocating drive locus shown in FIG. 15 (A) but an elliptical locus. As shown in FIG. 16B, in the actual drive signal of the DMD element 200, the phases of the X component sine wave and the Y component sine wave of the initial target drive signal shown in FIG. 15B are shifted.

  However, by applying the present invention, the comparison operation unit (115, 125, 190) compares and calculates the initial target drive signal of the DMD element 200 and the actual drive signal, and the drive signal adjustment unit (110, 120, 130, 140) generates a target drive signal in which the parameter of the initial target drive signal is adjusted based on the result of the comparison operation by the comparison operation unit (115, 125, 190). Then, by driving the DMD element 200 via the drive mechanism 210 (XDM, YDM) using the target drive signal after the parameter adjustment, the actual drive locus (actual drive signal) of the DMD element 200 is set to the initial target. The resolution of the projected image by the projector device can be improved by making the drive locus (initial target drive signal) follow the drive with high accuracy.

  FIGS. 17A and 17B show modified examples of the initial target drive trajectory of the DMD element 200 and the initial target drive signal. In this modified example, the predetermined locus drawn by the DMD element 200 is a linear reciprocating drive locus in the X direction in the plane orthogonal to the optical axis (FIG. 17A). For this reason, the drive signal for driving the DMD element 200 includes only the X component sine wave, and does not include the Y component sine wave (FIG. 17B). According to this modification, even if parameter adjustment is performed, only the X direction is performed, so that the calculation load on the CPU can be reduced.

10 Digital camera (shooting device)
20 Body 21 shutter (photographing optical system)
22 Image sensor (moving member, shake correction member)
22a pixel R G B color filter 23 aperture / shutter drive circuit 24 LCD
25 image memory 26 photographing operation switch 27 low-pass filter operation switch 28 gyro sensor (shake detection unit)
30 Shooting lens 31 Shooting lens group (shooting optical system, moving member, shake correction member)
32 Aperture (shooting optical system)
33 Memory for communication 40 DSP
50 Image Stabilizer (Drive Mechanism)
51 fixed support substrate 52 movable stage M1 M2 M3 magnet Y1 Y2 Y3 yoke C1 C2 C3 drive coil XDM X drive mechanism YDM Y drive mechanism H1 Hall sensor (Y Hall sensor, actual drive signal detection unit)
H2 Hall sensor (Y Hall sensor, actual drive signal detector)
H3 Hall sensor (X Hall sensor, actual drive signal detector)
60 Image sensor drive circuit (drive signal generator)
100 Movement target value input unit (target drive signal input unit)
110 X amplitude adjustment unit (target drive signal parameter adjustment unit, drive signal adjustment unit)
115 X amplitude comparison operation unit (comparison operation unit)
118 X error operation unit 120 Y amplitude adjustment unit (target drive signal parameter adjustment unit, drive signal adjustment unit)
125 Y amplitude comparison operation unit (comparison operation unit)
128 Y error operation unit 130 X phase adjustment unit (target drive signal parameter adjustment unit, drive signal adjustment unit)
135 X phase acquisition unit 140 Y phase adjustment unit (target drive signal parameter adjustment unit, drive signal adjustment unit)
145 Y phase acquisition unit 150 X controller 160 Y controller 170 180 A / D conversion unit 190 phase adjustment amount calculation unit (comparison operation unit)
200 DMD element (moving optical element)
210 Drive Mechanism 220 Drive Signal Generator

Claims (12)

An image sensor for converting an object image formed by the photographing optical system into an electrical pixel signal;
Using at least one of an optical element forming at least a part of the photographing optical system and the image sensor as a moving member, driving the moving member to draw a predetermined locus in a plane intersecting the optical axis of the photographing optical system. A driving mechanism for obtaining an optical low pass filter effect by causing a subject light flux to be incident on a plurality of pixels of the image sensor;
A drive signal generation unit that generates a drive signal for driving the moving member via the drive mechanism;
Equipped with
The drive signal generation unit
A target drive signal input unit for inputting a target drive signal corresponding to a target drive locus to be drawn by the moving member;
An actual drive signal detection unit that detects an actual drive signal corresponding to an actual drive locus actually drawn by the moving member when the moving member is driven by the target drive signal input to the target drive signal input unit;
A comparison operation unit that compares the target drive signal input to the target drive signal input unit with an actual drive signal detected by the actual drive signal detection unit;
A target drive signal parameter adjustment unit configured to adjust a parameter of the target drive signal based on the result of the comparison operation by the comparison operation unit;
Have
The predetermined trajectory drawn by the moving member is periodic defined by movement in only the X direction, only in the Y direction, or a combination of X and Y directions with respect to the X and Y directions orthogonal to each other in the plane. It is a locus,
The comparison operation unit executes comparison operation between the target drive signal and the actual drive signal by averaging the actual drive signal when the moving member draws a predetermined locus for two or more cycles.
An imaging device characterized by In the photographing apparatus according to claim 1,
Once the target drive signal parameter adjustment unit has adjusted the parameters of the target drive signal,
A first step of detecting an actual drive signal corresponding to an actual drive locus actually drawn by the moving member when the actual driving signal detection unit drives the moving member according to a target driving signal after parameter adjustment;
A second step of the comparison operation unit comparing and calculating an initial target drive signal input to the target drive signal input unit and an actual drive signal detected by the actual drive signal detection unit;
A third step of the target drive signal parameter adjustment unit re-adjusting the parameter of the target drive signal based on the result of the comparison operation by the comparison operation unit;
An imaging device that repeats a processing loop having: In the photographing apparatus according to claim 1 or 2,
The comparison operation unit calculates a difference between a target drive signal input to the target drive signal input unit and an actual drive signal detected by the actual drive signal detector.
The target drive signal parameter adjustment unit adjusts a parameter of the target drive signal when the difference between the target drive signal and the actual drive signal exceeds a predetermined value as a result of the comparison operation by the comparison operation unit, and adjusts the target drive signal. An imaging device for maintaining the parameter of the target drive signal without adjusting when the difference between the signal and the actual drive signal does not exceed a predetermined value. The imaging apparatus according to any one of claims 1 to 3.
The imaging apparatus further includes a target drive signal holding unit that holds the adjusted target drive signal each time the target drive signal parameter adjustment unit adjusts a parameter of the target drive signal. In the photographing apparatus according to claim 4,
The imaging device using a target drive signal held by the target drive signal holding unit when the movement of the moving member is resumed after the end of the driving of the moving member. The imaging apparatus according to any one of claims 1 to 5 .
When the comparison operation unit compares the target drive signal with the actual drive signal, the difference between the amplitudes of X component sine waves corresponding to the movement of the moving member in the X direction in the plane, the difference in the plane The difference in phase of an X component sine wave corresponding to the movement of the moving member in the X direction, the difference in amplitude of a Y component sine wave corresponding to the movement of the moving member in the Y direction in the plane, and the difference in the plane An imaging device for calculating a difference in phase of a Y component sine wave corresponding to the movement of a moving member in the Y direction. The imaging apparatus according to any one of claims 1 to 6 .
The target drive signal parameter adjustment unit adjusts an amplitude of an X component sine wave corresponding to movement of the moving member in the X direction in the plane when adjusting the parameter of the target drive signal; An X phase adjustment unit that adjusts the phase of an X component sine wave corresponding to the movement of the moving member in the X direction in the plane, and a Y component sine wave corresponding to the movement of the moving member in the Y direction in the plane An imaging apparatus comprising: a Y amplitude adjustment unit that adjusts amplitude; and a Y phase adjustment unit that adjusts the phase of a Y component sine wave corresponding to the movement of the moving member in the Y direction in the plane. In the photographing apparatus according to claim 6 or 7 ,
The predetermined trajectory drawn by the moving member is a circular motion in the plane,
An imaging apparatus, wherein a target drive signal input to the target drive signal input unit is the sum of the X component sine wave and the Y component sine wave that have the same amplitude and a 90 ° phase shift. The imaging apparatus according to any one of claims 1 to 8 .
The comparison operation unit holds or refers to a plurality of comparison operation expressions for the target drive signal parameter adjustment unit to adjust the parameters of the target drive signal, and any one of the plurality of comparison operation expressions An imaging device used selectively. An image sensor for converting an object image formed by the photographing optical system into an electrical pixel signal;
Using at least one of an optical element forming at least a part of the photographing optical system and the image sensor as a moving member, driving the moving member to draw a predetermined locus in a plane intersecting the optical axis of the photographing optical system. A driving mechanism for obtaining an optical low pass filter effect by causing a subject light flux to be incident on a plurality of pixels of the image sensor;
A drive signal generation unit that generates a drive signal for driving the moving member via the drive mechanism;
A photographing method using a photographing device provided with
The drive signal generation unit
A target drive signal input step for inputting a target drive signal corresponding to a target drive locus to be drawn by the moving member;
An actual drive signal detection step of detecting an actual drive signal corresponding to an actual drive locus actually drawn by the movable member when the movable member is driven by the target drive signal input in the target drive signal input step;
A comparison operation step of comparing the target drive signal input in the target drive signal input step with the actual drive signal detected in the actual drive signal detection step;
A target drive signal parameter adjustment step of adjusting a parameter of the target drive signal based on a result of the comparison operation in the comparison operation step;
Run
The predetermined trajectory drawn by the moving member is periodic defined by movement in only the X direction, only in the Y direction, or a combination of X and Y directions with respect to the X and Y directions orthogonal to each other in the plane. It is a locus,
In the comparison operation step, a comparison operation of the target drive signal and the actual drive signal is performed by averaging the actual drive signal when the moving member draws a predetermined locus of two or more cycles.
A photographing method characterized by An image sensor for converting an object image formed by the photographing optical system into an electrical pixel signal;
Using at least one of an optical element forming at least a part of the photographing optical system and the image sensor as a moving member, driving the moving member to draw a predetermined locus in a plane intersecting the optical axis of the photographing optical system. A driving mechanism for obtaining an optical low pass filter effect by causing a subject light flux to be incident on a plurality of pixels of the image sensor;
A drive signal generation unit that generates a drive signal for driving the moving member via the drive mechanism;
A program for controlling an imaging device comprising
The computer which comprises the said drive signal generation part,
A target drive signal input step for inputting a target drive signal corresponding to a target drive locus to be drawn by the moving member;
An actual drive signal detection step of detecting an actual drive signal corresponding to an actual drive locus actually drawn by the movable member when the movable member is driven by the target drive signal input in the target drive signal input step;
A comparison operation step of comparing the target drive signal input in the target drive signal input step with the actual drive signal detected in the actual drive signal detection step;
A target drive signal parameter adjustment step of adjusting a parameter of the target drive signal based on a result of the comparison operation in the comparison operation step;
To run
The predetermined trajectory drawn by the moving member is periodic defined by movement in only the X direction, only in the Y direction, or a combination of X and Y directions with respect to the X and Y directions orthogonal to each other in the plane. It is a locus,
In the comparison operation step, a comparison operation of the target drive signal and the actual drive signal is executed by averaging the actual drive signal when the moving member draws a predetermined locus of two or more cycles.
A program characterized by A moving optical element,
A drive mechanism for driving the movable optical element so as to draw a predetermined locus on a predetermined plane;
A drive signal generation unit that generates a drive signal for driving the moving optical element via the drive mechanism;
Equipped with
The drive signal generation unit
A target drive signal input unit for inputting a target drive signal corresponding to a target drive locus to be drawn by the moving optical element;
An actual drive signal detection unit for detecting an actual drive signal corresponding to an actual drive locus actually drawn by the movable optical element when the movable optical element is driven by the target drive signal input to the target drive signal input unit; ,
A comparison operation unit that compares the target drive signal input to the target drive signal input unit with an actual drive signal detected by the actual drive signal detection unit;
A target drive signal parameter adjustment unit configured to adjust a parameter of the target drive signal based on the result of the comparison operation by the comparison operation unit;
Have
The predetermined locus drawn by the movable optical element is periodically defined by movement in only the X direction, only in the Y direction, or a combination of X and Y directions with respect to the X and Y directions orthogonal to each other in the plane. Track,
The comparison operation unit executes comparison operation of the target drive signal and the actual drive signal by averaging the actual drive signal when the moving optical element draws a predetermined locus for two or more cycles.
Optical equipment characterized by

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