JP2015184565A - Control method and optical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent power shortage by using a plurality of image blur correction lenses.SOLUTION: When it is possible to simultaneously drive both driver circuits 224 and 228 by power to be supplied, a lens MPU 240 corrects image blur by driving both. However, when it is not possible to simultaneously drive both driver circuits 224 and 228 but it is possible to drive the driver circuit 224 by the power to be supplied, the lens MPU drives the driver circuit 224 to correct the image blur without driving the driver circuit 228.

Description

  The present invention relates to a control method and an optical apparatus.

  A correction lens that corrects image blur by moving in a direction orthogonal to the optical axis (this correction is called “optical blur correction”) is known. Patent Document 1 proposes using two types of correction lenses having different optical correction sensitivities, first correcting roughly with a lens having a high correction sensitivity, and then correcting image blur with a lens having a low correction sensitivity. Patent Document 2 proposes a camera that is equipped with optical shake correction means and electronic shake correction means, stops the optical shake correction means when the battery level is low, and operates only the electronic shake correction means. Yes.

JP2012-208210A JP 2001-311976 A

  As described in Patent Document 1, when two correction lenses are mounted, power consumption increases. For example, in an interchangeable lens type camera system, when two correction lenses are mounted on an interchangeable lens, depending on the power supplied by the camera body, if two are driven at the same time, the power may be insufficient and a malfunction may occur.

  An object of the present invention is to provide a control method and an optical apparatus that use a plurality of image blur correction lenses and can prevent power shortage.

In the control method of the present invention, the first image blur correction lens is driven in the direction orthogonal to the optical axis to correct the image blur, and the second image blur correction lens is orthogonal to the optical axis. A control method for controlling driving of a second driving unit that corrects image blur by driving in a direction, and based on information indicating supplied power, the first driving unit and the second driving unit A first step for determining whether or not both can be driven at the same time, and if it is determined in the first step that it is possible, the first driving means and the second driving In the second step of performing image blur correction by driving both of the means, and in the first step, when it is determined that it is not possible, the first step is performed based on the information indicating the supplied power. Drive means and the second drive means If it is determined in the third step for determining whether or not it is possible to drive either one of the first driving means and the second driving means in the third step, A fourth step of performing image blur correction by driving one of the first driving means and the second driving means without driving the other;
It is characterized by having.

  According to the present invention, it is possible to provide a control method and an optical apparatus that use a plurality of image blur correction lenses and can prevent power shortage.

It is a block diagram of the camera system in this embodiment. (Examples 1, 2, and 3) 6 is a flowchart showing the operation of the image blur correction control method of the present invention. (Example 1) 6 is a flowchart showing the operation of the image blur correction control method of the present invention. (Example 2) 6 is a flowchart showing the operation of the image blur correction control method of the present invention. (Example 3)

  FIG. 1 is a block diagram of a camera system (optical apparatus) according to this embodiment including a camera body 100 and an interchangeable lens 200. The camera body 100 is an imaging device (optical device) such as a single-lens reflex camera or a mirrorless camera, and the interchangeable lens 200 is a lens device (optical device) configured to be detachable from the camera body 100. The imaging device includes a digital still camera, a digital video camera, a TV camera, and the like.

  The interchangeable lens 200 and the camera body 100 are mechanically connected via a mount (not shown) and electrically connected via a connector provided on the mount. The connector is provided with a communication unit so that the camera body 100 and the interchangeable lens 200 can communicate with each other, and the interchangeable lens 200 is supplied with power from the camera body 100. As described above, the camera body 100 is a power supply source that supplies power to the interchangeable lens 200.

  The camera body 100 includes an image sensor 110, a video signal processing unit 120, a camera MPU 130, and a power source 140.

  The imaging element 110 is a photoelectric conversion element that photoelectrically converts an optical image formed by the photographing optical system. The analog electrical signal output from the image sensor 110 is converted into a digital signal by an A / D converter (not shown).

  The video signal processing unit 120 performs various image processing such as signal amplification and filter processing on the digital signal output from the A / D converter.

  The camera MPU 130 is a camera control unit that controls the entire camera body 100, and includes a microcomputer. The camera MPU 130 incorporates storage means (memory) such as RAM, ROM, and EEPROM. The camera MPU 130 communicates with the lens MPU 240 of the interchangeable lens 200 to transmit a drive command for the focus lens 210 and power information that can be supplied from the power supply 140, and the operation state and optical information in the camera body 100 and the interchangeable lens 200. Send and receive data.

  The camera MPU 130 generates a drive command for the focus lens 210 by focus detection using a contrast detection method or focus detection using a phase difference detection method. In contrast detection, focus detection is performed by detecting the peak position of the contrast of the subject image formed by the image sensor 110 while performing a scan that changes the relative position of the focus position formed by the imaging optical system and the image sensor 110. This is a detection method. The contrast value information can be acquired from the output of the video signal processing unit 120. The focus detection of the phase difference detection method is a method of detecting a focus by detecting a phase difference between image signals of a pair of subject images. The phase difference information can be obtained from a dedicated focus detection unit (not shown) or a focus detection pixel provided in the image sensor 110.

  The interchangeable lens 200 includes a photographing optical system, various drive circuits, various detection means, and a lens MPU 240.

  The photographing optical system forms an optical image of a subject, and includes a focus lens 210, an image blur correction lens (hereinafter referred to as “IS lens”) 212 and 214, and other optical elements (aperture, zoom lens, fixed lens, and the like). Have.

  The focus lens 210 is moved in the optical axis direction of the photographing optical system to perform focus adjustment. The drive circuit 220 drives the focus lens 210 along the optical axis in accordance with a drive command from the lens MPU 240.

  The IS lenses 212 and 214 are moved in a direction perpendicular to the optical axis to correct image blur (optical blur correction). The “perpendicular direction” only needs to have a component orthogonal to the optical axis, and may be moved obliquely with respect to the optical axis. The IS lens 212 is a first IS lens, and the IS lens 214 is a second IS lens, but this embodiment does not limit the number of IS lenses.

  The diaphragm adjusts the amount of light incident on the image sensor 110, and the diaphragm blades (not shown) are driven by a drive circuit (not shown) to change the F value. The zoom lens (magnification lens) is moved in the optical axis direction by a drive circuit (not shown) to change the focal length.

  The various drive circuits include a drive circuit 220 that drives the focus lens 210 in the optical axis direction, a drive circuit (first drive means) 224 that drives the IS lens 212 in the optical axis orthogonal direction, and an IS lens 214 in the optical axis orthogonal direction. A driving circuit 228 (second driving means) for driving is included. Each drive circuit can use various motors such as a stepping motor, an ultrasonic motor, and a voice coil motor.

  The various detection means include a position detection unit 222 that detects the position of the IS lens 212, a position detection unit 226 that detects the position of the IS lens 214, and an angular velocity sensor 114 that detects rotational shake applied to the interchangeable lens 200. The angular velocity sensor 114 may be composed of a gyro sensor, an acceleration sensor, or the like, detects the amount of camera shake and the direction of camera shake at the time of shooting, and transmits the detection result to the lens MPU 240.

  The lens MPU 240 is a lens control unit that controls all of the interchangeable lens 200, and includes a microcomputer. The lens MPU 240 incorporates storage means (memory) such as RAM, ROM, and EEPROM. This memory stores an image blur correction control method program, which will be described later, data necessary for the program, identification information of the camera main body 100 that can drive the two IS lenses 212 and 214 simultaneously, and the like.

  In response to a focus drive command from the camera MPU 130, the lens MPU 240 outputs a drive signal to the drive circuit 115 to drive the focus lens 210.

  Further, when receiving the shake signal from the angular velocity sensor 114, the lens MPU 240 calculates the target positions of the IS lenses 212 and 214. Next, the lens MPU 240 outputs a drive signal corresponding to the difference between the target position of the IS lens 212 and the position detected by the position detection unit 222 to the drive circuit 111. Similarly, the lens MPU 240 outputs a drive signal corresponding to the difference between the target position of the IS lens 214 and the position detected by the position detection unit 112 to the drive circuit 113. Then, the drive circuit 111 drives the IS lens 212, and the drive circuit 113 drives the IS lens 214, and image blur correction is performed. In the image blur correction, the lens MPU 240 controls whether to drive the two IS lenses at the same time or to drive one of the IS lenses according to the suppliable power information transmitted from the camera body 100.

  The present invention does not limit the magnitude of the image blur correction amount per unit driving amount of the IS lens 212 and the image blur correction amount per unit driving amount of the IS lens 214. Image blur correction amounts (hereinafter simply referred to as “correction amounts”) per two unit drive amounts by the corresponding drive circuit may be equal, or one of them may be large.

  In the present embodiment, it is assumed that the correction amount per unit drive amount of the IS lens 212 is larger than the correction amount per unit drive amount of the IS lens 214. Accordingly, the image blur correction can be performed roughly by driving the IS lens 212, and the image blur correction can be performed finely by driving the IS lens 214.

  In the case where only one of the two IS lenses is driven, when the information indicating the supplied power is larger than one of the driving powers required for the two driving circuits 224 and 228 and smaller than the other, the lens MPU 240 Since there is no room for selecting the other, the one is selected.

  However, when only one of the two IS lenses is driven, it may be possible to select either of the two IS lenses. In this case, which drive circuit is used becomes a problem.

  In each of the embodiments described below, when driving only one of the two IS lenses, the lens MPU 240 always drives the IS lens 212. However, this is just an example. In this case, the lens MPU 240 only needs to select one of the two drive circuits 224 and 228 and not the other. However, it is possible to obtain a large correction effect by driving the IS lens 212 having a large correction amount, and to obtain a high-quality image.

  In another embodiment, the lens MPU 240 selects a drive circuit having a smaller drive power among the drive power required for the drive circuit 224 and the drive power required for the drive circuit 228. Thereby, a higher energy saving effect can be realized. The drive power required for the drive circuit depends on the type of motor, the structure (weight) of the IS lens, the distance between the current position and the target position, and the like.

  When driving of the driving circuit 224 is selected, a large image blur correction effect is obtained, and when driving of the driving circuit 228 is selected, a large energy saving effect is obtained, the lens MPU 240 is driven by the driving circuit according to the mode set in the camera body 130. May be selected. These modes include a high image quality mode and an energy saving mode. In this case, the lens MPU 240 selects one of the two drive circuits 224 and 228 based on a command from the camera MPU 130.

  Based on communication from the camera MPU 130, the lens MPU 240 performs communication interruption processing. In the communication interrupt, the lens MPU 240 analyzes a command (command) from the camera MPU 130 and branches to a process corresponding to each command. For example, when a focus drive command is received, the speed of the motor that drives the focus lens 210 is set, a drive signal is output to the drive circuit 220, and the focus lens 210 is driven. In status communication, the camera body 100 status (release switch status, shooting mode, shutter speed, etc.) is received, and the interchangeable lens 200 status (focal length, aperture status, focus lens 210 drive status) is transmitted. In addition, the lens MPU 240 receives information on power that can be supplied from the camera MPU 130 and stores the received information in the memory of the lens MPU 240.

  Hereinafter, an image blur correction control method performed by the lens MPU 240 in each embodiment will be described. In the flowchart of each embodiment, “S” represents a step (process), and the image blur correction control method shown in the flowchart can be embodied as a program for causing a computer to execute the function of each step. This program may be stored in a storage medium (such as a tangible storage medium that is not temporary) and executed by a computer.

  FIG. 2 is a flowchart for explaining the image blur correction control method according to the first embodiment. Image blur correction is performed by the lens MPU 240 by a timer interruption that occurs at regular intervals.

  The lens MPU 240 receives the A / D converted signal from the angular velocity sensor 114 (S201), applies a high-pass filter (HPF) to remove the offset component (S202), performs an integration operation, and converts the angular velocity signal into an angular displacement signal. Conversion is performed (S203).

  Next, the lens MPU 240 determines whether the suppliable power (Sply_W) received from the camera MPU 130 is greater than the sum of the driving power (W1) required for the driving circuit 224 and the driving power (W2) required for the driving circuit 228. Is determined (S204). S204 functions as a first step for determining whether or not both of the drive circuits 224 and 228 can be driven simultaneously based on the information of the supplied power.

  If it is determined in S204 that it is large, that is, if both of the IS lenses 212 and 214 can be driven within the suppliable power (Sply_W> W1 + W2) (Yes in S204), the process proceeds to S205. The process proceeds to S215.

  In S205, the lens MPU 240 calculates the target position of the IS lens 212 (SFTDRV_1A) and sets it as the target signal SFTDRV1, and in S206, calculates the target position of the IS lens 214 (SFTDRV_2A) and sets it as the target signal SFTDRV2.

  In S207, the lens MPU 240 acquires the signal of the position detection unit 222 that has been A / D converted, and sets it to SFTPST1. In S208, the lens MPU 204 performs a feedback calculation (SFTDRV1-SFTPST1), and sets the calculation result as SFT_DT1. In S209, the lens MPU 204 performs a filter process or the like on the calculation result (SFT_DT1) to obtain a lens driving signal, and outputs the signal to the driving circuit 111 in S210 to drive the IS lens 212.

  In S211, the lens MPU 204 acquires the signal of the position detection unit 112 subjected to A / D conversion, and sets it as SFTPST2. In S212, the lens MPU 204 performs a feedback calculation (SFTDRV2-SFTPST2), and sets the calculation result as SFT_DT2. In S213, the lens MPU 204 performs filter processing or the like on the calculation result (SFT_DT2) to generate a lens driving signal, and outputs the signal to the driving circuit 113 in S214 to drive the IS lens 214.

  In steps S205 to S214 (second step), as described above, the lens MPU 240 performs image blur correction by driving both the drive circuits 224 and 228. Thereby, it is possible to correct even a large shake.

  On the other hand, in S204, the lens MPU 204 determines that the suppliable power (Sply_W) is less than or equal to the sum of the power (W1) for driving the IS lens 212 and the power (W2) for driving the IS lens 214 (S204). No), the flow moves to S215.

  In S215, the lens MPU 204 determines whether or not the suppliable power (Sply_W) is larger than the power (W1) for driving the IS lens 212. S215 functions as a third step for determining whether or not the drive circuit 224 (one of the drive circuits 224 and 228) can be driven by the supplied power when it is determined not to be possible in S204. To do.

  If it is determined in S215 that the power that can be supplied is larger than the power for driving the IS lens 212, that is, if the IS lens 212 can be driven within the range of power that can be supplied, the process proceeds to S216.

  In S216, the lens MPU 204 calculates the target position of the IS lens 212 (SFTDRV_1B) and sets it to the target signal SFTDRV1. In S217, the lens MPU 204 acquires the A / D converted signal of the position detection unit 222 and sets it to SFTPST1. In S218, the lens MPU 204 performs a feedback calculation (SFTDRV1-SFTPST1), and sets the calculation result as SFT_DT1. In S219, the lens MPU 204 performs filter processing on the calculation result (SFT_DT1) and outputs a lens driving signal. In S220, the lens MPU 204 outputs the signal to the driving circuit 111 to drive the IS lens 212. Further, the lens MPU 204 stops driving the IS lens 214 (S221).

  In steps S216 to S221 (fourth step), as described above, the lens MPU 240 performs image blur correction by driving the drive circuit 224 without driving the drive circuit 228. Although it is not possible to drive both of the two IS lenses within the power supply range, when one of the IS lenses 212 can be driven, only the IS lens 212 is driven without driving the other IS lens 216.

  On the other hand, if the suppliable power (Sply_W) is equal to or lower than the power (W1) for driving the IS lens 212 in S215, the lens MPU 204 stops driving the IS lens 212 (S222) and stops driving the IS lens 214. (S223).

  As described above, when both of the two IS lenses can be driven within the range of the electric power supplied from the camera body 100, both are driven together to correct a large blur, and when only one of them can be driven, only that one is driven. Thus, image blur correction is performed without power shortage.

  FIG. 3 is a flowchart for explaining an image blur correction control method according to the second embodiment. 3, the same steps as those in FIG. 2 are denoted by the same reference numerals. In the flowchart shown in FIG. 3, S230 is provided instead of S204, and the other operations are the same as those in FIG. 2, and therefore only S230 will be described.

  When the interchangeable lens 200 is newly attached or when the main power supply of the camera body 100 is turned on, reset communication is performed between the camera MPU 130 and the lens MPU 240. In the reset communication, the lens MPU 240 transmits identification information representing its model and unique configuration to the camera MPU 130, and receives identification information (including suppliable power information) representing the model and unique configuration from the camera MPU 130.

  In S230, the lens MPU 240 determines whether the camera is capable of operating two IS lenses based on the ID information (ID_Data) of the camera body 100 acquired by reset communication with the camera MPU 130. S230 functions as a first step for determining whether both of the drive circuits 224 and 228 can be simultaneously driven based on the supplied power. If it is determined in S230 that it is possible (ID_Data = DoubleEn), the flow proceeds to S205, and if it is determined to be impossible, the flow proceeds to S215.

  In steps S205 to S214 (second step), as described above, the lens MPU 240 performs image blur correction by driving both the drive circuits 224 and 228. Large blurring can be corrected by driving both of the two IS lenses within the range of power that can be supplied from the camera body 100.

  S215 functions as a third step for determining whether or not the drive circuit 224 can be driven by the supplied power when it is determined that the process is not possible in S204. In steps S216 to S221 (fourth step), as described above, the lens MPU 240 performs image blur correction by driving the drive circuit 224 without driving the drive circuit 228.

  As described above, when both of the two IS lenses can be driven based on the ID information of the camera body 100, both of them are driven to correct a large shake. When only one of them can be driven, only that one is driven. The image blur correction is performed without power shortage.

  In combination with the first and second embodiments, first, it is determined whether or not the two IS lenses 212 and 214 can be driven at the same time based on the identification information acquired by the reset communication. The power supply information acquired by interrupt communication may be used.

  FIG. 4 is a flowchart for explaining an image blur correction control method according to the third embodiment. 4, the same steps as those in FIG. 2 are denoted by the same reference numerals. In the flowchart shown in FIG. 3, S240 is provided instead of S204, S242 is added, and other operations are the same as those in FIG. 2, so only S240 and S242 will be described.

  In S240, the lens MPU 240 determines that the difference between the suppliable power (Sply_W) received from the camera MPU 130 and the driving power (WF) of the focus lens 210 is greater than the total power (W1 + W2) for driving the IS lenses 212 and 214. Determine if it is large. If it is larger, that is, if the focus lens 114 and the two IS lenses can be driven within the power supply range, the flow proceeds to S205. If the power (Sply_W−WF) obtained by subtracting the driving power of the focus lens 210 from the suppliable power is equal to or less than the total power (W1 + W2) for driving the IS lenses 212 and 214, the flow proceeds to S242.

  In S242, the lens MPU 240 determines whether (Sply_W−WF) is larger than the power (W1) for driving the IS lens 212. If it is larger, that is, if the focus lens 114 and the IS lens 212 can be driven within the power supply range, the process proceeds to S215, and in the following cases, the process proceeds to S222.

  As described above, according to the present embodiment, when all of the focus lens 210 and the IS lenses 212 and 214 can be driven within the range of power that can be supplied, both IS lenses are driven to correct large shake. In addition, when only the focus lens 210 and the IS lens 212 can be driven, image blur correction can be performed without driving power shortage by driving only the focus lens 210 and the IS lens 212. That is, priority is given to driving the focus lens 210, and control is performed to drive two IS correction lenses or only one with the remaining usable power.

  The driven member and the driving means for driving the driven member are not limited to the focus lens 210 and the driving circuit 220. The driven member may include a diaphragm and a zoom lens (not shown).

  For example, priority may be given to driving of the focus lens 210 and a diaphragm (not shown). In this case, “the power obtained by subtracting the driving power of the focus lens 210 from the suppliable power” is “the power obtained by subtracting the driving power of the focus lens 210 and the driving power (WD) of the aperture from the suppliable power (Sply_W-WF-WD). Is replaced.

  Similarly, driving of the focus lens 210 and a zoom lens (not shown) may be prioritized. In this case, “the power obtained by subtracting the driving power of the focus lens 210 from the suppliable power” is “the power (Sply_W−WF−WZ) obtained by subtracting the driving power of the focus lens 210 and the driving power (WZ) of the zoom lens from the suppliable power. ) ”.

  Furthermore, priority may be given to driving of the focus lens 210, a diaphragm (not shown), and a zoom lens. In this case, “the power obtained by subtracting the driving power of the focus lens 210 from the suppliable power” is “the power obtained by subtracting the driving power of the focus lens 210, the driving power of the aperture, and the driving power of the zoom lens from the suppliable power (Sply_W−WF -WD-WZ) ".

  Alternatively, priority may be given to the driving of the zoom lens and / or the diaphragm instead of the driving of the focus lens.

  As mentioned above, although the Example of this invention was described, this invention is not limited to these Examples, A various deformation | transformation and change are possible within the range of the summary. For example, the control unit of the lens-integrated camera may perform the image blur correction control method of the present invention.

  The optical apparatus of the present invention can be applied to an interchangeable lens of a single-lens reflex camera or a mirrorless camera.

  DESCRIPTION OF SYMBOLS 200 ... Interchangeable lens (optical apparatus), 212 ... IS lens (1st image blur correction lens), 214 ... IS lens (2nd image blur correction lens), 224 ... Drive circuit (1st drive means), 228 ... Drive circuit (second drive means), 240 ... Lens MPU (lens control means)

Claims (10)

The first image blur correction lens is driven in a direction orthogonal to the optical axis to correct image blur, and the second image blur correction lens is driven in a direction orthogonal to the optical axis to cause image blur. A control method for controlling the driving of the second driving means for correcting
A first step of determining whether it is possible to simultaneously drive both the first drive means and the second drive means based on information indicating the supplied power;
A second step of performing image blur correction by driving both the first driving means and the second driving means when it is determined in the first step that it is possible;
If it is determined in the first step that it is not possible, either one of the first driving means and the second driving means is driven based on the information indicating the supplied power. A third step to determine whether or not
If it is determined in the third step that it is possible, the first driving means and the second driving means are driven without driving the other of the first driving means and the second driving means. A fourth step of performing image blur correction by driving one of
A control method characterized by comprising:   In the first step, whether the supplied power is greater than the sum of the driving power required to drive the first driving means and the driving power required to drive the second driving means. The control method according to claim 1, which is a step of determining whether or not.   Whether the first step is a supply source capable of simultaneously driving both the first drive unit and the second drive unit based on identification information of a supply source supplying the power The control method according to claim 1, wherein the control method is a step of determining A control method for further controlling the driving of the third driving means for driving the driven member,
In the first step, the power obtained by subtracting the driving power required to drive the third driving means from the supplied power is the driving power required to drive the first driving means and the power The control method according to any one of claims 1 to 3, wherein the control method is a step of determining whether or not the sum is larger than a total of driving power necessary for driving the second driving means.   The driven member includes at least one of a focus lens that moves in the optical axis direction to adjust the focus, a zoom lens that moves in the optical axis direction to change the focal length, and a diaphragm that adjusts the amount of light. The control method according to claim 4, characterized in that:   The supplied electric power is larger than the driving means necessary for driving one of the first driving means and the second driving means, and the other of the first driving means and the second driving means. The control method according to any one of claims 1 to 5, wherein the control method is smaller than a driving means necessary for driving the motor.   The image blur correction amount per unit driving amount by one of the first driving unit and the second driving unit is the image blur per unit driving amount by the other of the first driving unit and the second driving unit. The control method according to claim 1, wherein the control method is larger than the correction amount.   The drive power required to drive one of the first drive means and the second drive means is the drive power required to drive the other of the first drive means and the second drive means. The control method according to any one of claims 1 to 7, wherein the control method is smaller.   A program for causing a computer to execute the control method according to any one of claims 1 to 8. The first image blur correction lens is driven in a direction orthogonal to the optical axis to correct image blur, and the second image blur correction lens is driven in a direction orthogonal to the optical axis to cause image blur. Second driving means for correcting the control, and control means,
The control means includes
When it is possible to drive both the first drive unit and the second drive unit simultaneously based on information indicating the supplied power, the first drive unit and the second drive unit Image blur correction by driving both means,
Although it is not possible to drive both the first driving means and the second driving means simultaneously based on the information indicating the supplied power, the first driving means and the second driving are not possible. When it is possible to drive either one of the means, the first drive means and the second drive means without driving the other of the first drive means and the second drive means. An optical apparatus that performs image blur correction by driving one of the two.