Lens device, imaging apparatus, method for controlling lens device, and program

Abstract

To provide a lens device capable of properly adjusting a focus difference between a pair of images formed by two optical systems, with low power consumption.SOLUTION: A lens device (200) includes a first optical system (210L), a second optical system (210R) which is arranged in parallel with the first optical system, a first driving part (300) which drives at least one lens of the first optical system and at least one lens of the second optical system, to simultaneously move a first image formation position of a first optical image formed by the first optical system and a second image formation position of a second optical image formed by the second optical system, a second driving part (400) which drives at least one lens of the second optical system, to move the second image formation position of the second optical image formed by the second optical system, a storage part (500) which stores information relating to a relative change between the first image formation position and the second image formation position, and a control part (230) which controls the second driving part by using the information, to correct a relative position between the first image formation position and the second image formation position.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lens apparatus, an imaging apparatus, a control method for a lens apparatus, and a program. [Background technology]

[0002] In recent years, lens devices for capturing stereoscopic images to record stereoscopic images to be viewed on stereoscopic image display devices such as VR (Virtual Reality) goggles and 3D (three-dimensional) displays have become known. Patent Document 1 discloses a lens device in which two sets of optical systems are arranged in parallel, and two image circles are formed in parallel on one imaging element. The two sets of optical systems are arranged in the horizontal direction with a predetermined distance between them. This distance is called the base line length. This base line length allows a pair of images with parallax for the right and left eyes to be captured simultaneously.

[0003] In order for a viewer to obtain a natural three-dimensional effect from a stereoscopic image display device, a pair of images, one for the right eye and one for the left eye, must be in focus on the same subject. Patent Document 2 discloses a method in which two actuators are used to drive the left and right optical systems independently and perform focusing for each. Patent Document 3 discloses a method in which a single actuator is used to drive the left and right optical systems together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-3022 A [Patent Document 2] International Publication No. 2011 / 118078 [Patent Document 2] Patent Publication No. 2021-51282 Summary of the Invention [Problem to be solved by the invention]

[0005] The method disclosed in Patent Document 2 consumes a lot of power because the left and right actuators are driven separately during focusing. The method disclosed in Patent Document 3 can reduce power consumption, but if there is a focus difference between the left and right optical systems, the image formed by one of the optical systems will be out of focus. Therefore, Patent Document 3 discloses a method of adjusting the left and right focus difference by using a spacer during assembly to relatively displace the left and right optical systems with respect to the optical axis. However, in reality, the camera sensor is tilted, so the left and right focus difference occurs not only during assembly but also when attached to the camera.

[0006] For this reason, it is necessary to provide a mechanism on either the left or right lens to adjust the focus difference between the left and right lenses after mounting them on the camera. The focus difference adjustment mechanism can be, for example, a focus drive means used in general interchangeable lenses, but there is a possibility that unintended focus difference will occur between the left and right lenses due to inertia and backlash of the focus difference adjustment mechanism, or deformation of parts due to temperature changes.

[0007] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a lens device that is capable of appropriately adjusting the focus difference between a pair of images formed by two optical systems with low power consumption. [Means for solving the problem]

[0008] A lens device according to one aspect of the present invention has a first optical system, a second optical system arranged in parallel to the first optical system, a first drive unit that drives at least one lens of the first optical system and at least one lens of the second optical system to simultaneously move a first imaging position of a first optical image formed by the first optical system and a second imaging position of a second optical image formed by the second optical system, a second drive unit that drives at least one lens of the second optical system to move the second imaging position of the second optical image formed by the second optical system, a memory unit that stores information regarding a relative change between the first imaging position and the second imaging position, and a control unit that controls the second drive unit using the information to correct the relative position between the first imaging position and the second imaging position.

[0009] Other objects and features of the present invention are illustrated in the following examples. Effect of the Invention

[0010] According to the present invention, it is possible to provide a lens device that is capable of appropriately adjusting the focus difference between a pair of images formed by two optical systems with low power consumption. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram of an imaging device according to first and second embodiments. [Diagram 2] FIG. 2 is a configuration diagram of a first driving means and a second driving means in each embodiment. [Diagram 3] 5A to 5C are diagrams illustrating left and right focus differences in each embodiment. [Figure 4] 10 is a flowchart showing a process for adjusting a left-right focus difference in each embodiment. [Diagram 5] FIG. 4 is an explanatory diagram of a correction table in the first and second embodiments. [Figure 6] 4 is a flowchart showing a correction method in the first embodiment. [Figure 7] 10 is a flowchart showing a correction method in the second embodiment. [Figure 8] FIG. 11 is a block diagram of an imaging device according to the third and fourth embodiments. [Figure 9] FIG. 11 is an explanatory diagram of a correction table in the third and fourth embodiments. [Figure 10] 13 is a flowchart showing a correction method in the third embodiment. [Figure 11] 13 is a flowchart showing a correction method in the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. EXAMPLES

[0013] First, a basic configuration of an image capturing device 100 in a first embodiment of the present invention will be described with reference to Fig. 1. Fig. 1 is a block diagram of the image capturing device 100. The image capturing device 100 is an interchangeable lens system having a camera body (image capturing device body) 110 and a lens device (interchangeable lens) 200 that is detachable from the camera body 110.

[0014] First, a description will be given of the configuration of the lens device 200. The lens device 200 has a right-eye optical system 210R, a left-eye optical system 210L, a first driving means 300, a second driving means 400, a mode switching SW 220, a lens microcomputer (controller) 230, an operation unit 240, and a storage unit 500. The left-eye optical system (first optical system) 210L and the right-eye optical system (second optical system) 210R are two optical systems arranged in parallel with each other.

[0015] The first driving means (first driving section) 300 drives the left-eye optical system 210L and the right-eye optical system 210R in the optical axis direction. As a result, the first driving means 300 simultaneously moves the imaging position (first imaging position) of the optical image (first optical image) formed by the left-eye optical system 210L and the imaging position (second imaging position) of the optical image (second optical image) formed by the right-eye optical system 210R. The second driving means (second driving section) 400 drives the right-eye optical system 210R to move the imaging position (second imaging position) of the optical image (second optical image) formed by the right-eye optical system 210R. In this way, the first driving means 300 has a function of integrally adjusting the imaging position (focus position) of the right-eye optical system 210R and the imaging position (focus position) of the left-eye optical system 210L. The second driving means 400 has a function of adjusting the focus position of the right-eye optical system 210R.

[0016] The operation unit 240 is provided so that the user can adjust the focus position. When the user operates the operation unit 240, the lens microcomputer 230 determines the drive amount and drive direction of the first driving means 300 and the second driving means 400 based on the detection results of the operation amount and operation direction. The mode switching SW 220 is a switching unit that switches between a first mode (shooting mode) and a second mode (left-right focus difference adjustment mode, correction mode) by the user's operation. In the shooting mode, the lens microcomputer 230 sends a command only to the first driving means 300 and performs focus adjustment by extending the entire right eye optical system 210R and the left eye optical system 210L.

[0017] In the left-right focus difference adjustment mode, the lens microcomputer 230 sends a command only to the second driving means 400 to drive only the right-eye optical system 210R to adjust the left-right focus difference. For example, the lens microcomputer 230 controls the second driving means 400 using a correction table described later, and adjusts (corrects) the relative position between the imaging position of the optical image formed by the left-eye optical system 210L and the imaging position of the optical image formed by the right-eye optical system 210R.

[0018] The storage unit 500 stores various correction tables (data) described later. The correction tables include information on relative changes between the imaging position of an optical image formed by the right-eye optical system 210R and the imaging position of an optical image formed by the left-eye optical system 210L (information on at least one of the inertia and backlash of the right-eye optical system 210R). The correction data stored in the storage unit 500 is used to correct the imaging position of the right-eye optical system 210R as necessary.

[0019] Next, the configuration of the camera body 110 will be described. The camera body 110 has an image sensor 120 including phase difference focus detection pixels and the like, a signal processing circuit 130, and a camera microcomputer (control unit) 140. An image of a subject is formed on the image sensor 120 in the form of a right eye image (second optical image) formed via the right eye optical system 210R and a left eye image (first optical image) formed via the left eye optical system 210L, arranged side by side. The image sensor 120 photoelectrically converts (images) the subject image (optical image) formed by the right eye optical system 210R and the left eye optical system 210L, and outputs an analog image signal as an electrical signal. The analog image signal is converted into a digital image signal by an A / D conversion circuit (not shown).

[0020] The signal processing circuit 130 performs various image processing on the digital imaging signal to generate an image signal (captured image), and outputs the image signal to the camera microcomputer 140. The signal processing circuit 130 also outputs pixel signals output from phase difference focus detection pixels implemented in the imaging element 120 to the camera microcomputer 140.

[0021] The camera microcomputer 140 performs overall control of the imaging device 100. This control includes a function related to adjusting the focus position. The camera microcomputer 140 detects (acquires) the amount of focus deviation (defocus amount) by a phase difference detection method based on the image signal of the focus detection image data obtained from the signal processing circuit 130. The camera microcomputer 140 calculates the drive amount of the first driving means 300 according to the acquired defocus amount.

[0022] Next, the configuration of the first driving means 300 and the second driving means 400 will be described with reference to FIG. 2. FIG. 2 is a configuration diagram of the first driving means 300 and the second driving means 400. The lens device 200 has a right-eye optical system 210R and a left-eye optical system 210L. The right-eye optical system 210R and the left-eye optical system 210L are attached to a lens base 310. In this embodiment, the left-eye optical system 210L is fixed to the lens base 310, and the right-eye optical system 210R is supported so as to be movable in the optical axis direction relative to the lens base 310. The first driving means 300 is configured to include the lens base 310 and a lens driving unit 320 for driving the lens base 310. The second driving means 400 is configured to include a lens mounting unit 410 for driving the right-eye optical system 210R relatively to the lens base 310, and a lens driving unit 420R for driving the lens mounting unit 410. In this embodiment, the driving source is a general DC motor or a stepping motor.

[0023] Next, the reason why adjustment of the left-right focus difference is necessary will be described with reference to Fig. 3. Fig. 3 is an explanatory diagram of the left-right focus difference. The imaging device 100 has a camera mount section of the camera body 110 and a lens mount section of the lens device 200 (neither shown), and the lens device 200 is attached to the camera body 110 via each mount section. For this reason, the imaging element 120 in the imaging device 100 is placed parallel to the lens mount section.

[0024] On the other hand, due to manufacturing errors, it is difficult to make the parallelism between the image sensor 120 and the lens mount completely zero, and the image sensor 120 is fixed with a small inclination θ as shown in FIG. 3. In the manufacturing process of the lens device 200, the distances between the imaging positions of the optical images of the right-eye optical system 210R and the left-eye optical system 210L from the respective mounts, that is, the flange back distances, are adjusted to eliminate the difference. However, due to the inclination of the image sensor 120 in the imaging device 100 described above, a deviation occurs between the imaging positions of the right-eye optical system 210R and the left-eye optical system 210L, and a focus difference occurs between the right-eye optical system 210R and the left-eye optical system 210L. If this focus difference falls outside the allowable range, the user feels discomfort in the left and right images, making it difficult for the user to obtain a stereoscopic effect from the left and right images.

[0025] Therefore, in this embodiment, as described above, the right eye optical system 210R is configured to be movable in the optical axis direction by the second driving means 400, thereby making it possible to adjust the focal positions of the left and right eyes. Also, in this embodiment, the allowable range of the left and right focal difference is set to a predetermined range (allowable range D). Here, the allowable range D changes depending on the focal length or F-number (aperture value) of each optical system. In other words, if the deviation in the relative focal positions of the optical images of the left and right optical systems is within the allowable range D (within the predetermined range), the user will not feel any discomfort in the left and right images.

[0026] Next, the left-right focus difference adjustment process will be described in detail with reference to Fig. 4. Fig. 4 is a flowchart showing the left-right focus difference adjustment process (lens driving process). When a focus difference occurs between the left and right images and the user feels uncomfortable with the left and right images, in step S101, the user switches the mode switching SW 220, and the lens microcomputer 230 starts the left-right focus difference adjustment mode.

[0027] Next, in step S102, when the user operates the operation unit 240, the lens microcomputer 230 detects the amount of operation. Next, in step S103, the lens microcomputer 230 drives the lens driving unit 420R so that the driving direction and driving amount correspond to the detected amount of operation. Next, in step S104, the user determines whether or not there is any discomfort between the left and right images. If it is determined that there is discomfort between the left and right images, the process returns to step S102. On the other hand, if it is determined that there is no discomfort between the left and right images, the process proceeds to step S105. In step S105, the user switches the mode switching SW 220 to the shooting mode, and the lens microcomputer 230 ends the left and right focus difference adjustment process and transitions to the shooting mode.

[0028] Next, a method for correcting the left-right focus difference caused by inertia or backlash will be described. If an external force acts after the user adjusts the left-right focus difference by the above-mentioned adjustment process, the position of the right-eye optical system 210R may change from the time of adjustment due to the inertia and backlash of the lens driving unit 420R and the lens mounting unit 410, and readjustment may be required.

[0029] Therefore, in this embodiment, the storage unit 500 stores the correction tables (table 1 and table 2) as shown in FIG. 5. FIG. 5 is an explanatory diagram of the correction tables. Table 1 shows the amount of change in the imaging position of the right eye optical system 210R due to the inertia and backlash of the lens driving unit 420R and the lens mounting unit 410 measured in the manufacturing process for each position (focus position) of the right eye optical system 210R. The amount of change in the imaging position of the right eye optical system 210R due to the inertia and backlash appears with the sign reversed. Therefore, in this embodiment, the case where the imaging position moves to the lens device 200 side is considered to be positive, but this is not limited to this. Table 2 shows the direction in which the right eye optical system 210R is driven in the left-right focus difference adjustment mode. In this embodiment, information on both the inertia and the backlash is stored as the correction table, but this is not limited to this, and only one of the information may be stored and used as the correction table.

[0030] First, an outline of the correction method in this embodiment will be described. In the left-right focus difference adjustment mode, the user operates the operation unit 240 to drive the lens driving unit 420R until the sense of incongruity between the left and right images disappears. At this time, due to the influence of inertia of the lens driving unit 420R and the lens mounting unit 410, the right eye optical system 210R may overshoot in the driving direction, and due to the influence of backlash, it may undershoot in the driving direction. That is, when an external force acts on the lens device 200 after the left-right focus difference adjustment mode ends, the adjustment position of the right eye optical system 210R moves due to inertia and backlash, and the imaging position changes. As a result, a focus difference occurs between the left and right optical systems, so the user feels uncomfortable about the left and right images and needs to be readjusted. Therefore, in order to reduce the unintended left-right focus difference, it is necessary to move the right eye optical system 210R so that the imaging position moves in the opposite direction to the change in the imaging position due to inertia and backlash. In this embodiment, the amount of change in the imaging position due to inertia and backlash is measured for each position of the right-eye optical system 210R in the manufacturing process, and is stored as a table.

[0031] When the user ends the left-right focus difference adjustment mode, the lens microcomputer 230 refers to the amount of change in inertia and backlash at the position of the right-eye optical system 210R and calculates a correction value. Based on the driving direction information of the right-eye optical system 210R at the end of the left-right focus difference adjustment mode and the calculation result, the right-eye optical system 210R is driven so that the left-right focus difference does not increase even if the position of the right-eye optical system 210R is changed by an external force. In this embodiment, the correction amount is a value obtained by dividing the sum of the amount of change in the imaging position of the right-eye optical system 210R due to inertia and backlash by half, but is not limited to this.

[0032] Next, the correction method in this embodiment will be described with reference to Fig. 6. Fig. 6 is a flowchart showing the correction method in this embodiment. When the user feels something is wrong with the left and right images, in step S201, the user switches the mode switching SW 220, and the lens microcomputer 230 starts the left and right focus difference adjustment mode.

[0033] Next, in step S202, the user operates the operation unit 240, and the lens microcomputer 230 drives the lens driving unit 420R. Next, in step S203, the storage unit 500 stores the driving direction of the lens driving unit 420R. The latest driving direction is overwritten in the storage unit 500, and only the final driving direction needs to be stored. Next, in step S204, the user determines whether or not the left and right focus difference has disappeared and there is no sense of incongruity in the left and right images. If it is determined that there is incongruity in the left and right images, the process returns to step S202. On the other hand, if it is determined that there is no incongruity in the left and right images, the process proceeds to step S205. In step S205, the user operates the mode switching SW220 to switch to the shooting mode and ends the left and right focus difference adjustment mode.

[0034] Next, in step S206, the lens microcomputer 230 detects the position of the right eye optical system 210R using a sensor (not shown). Next, in step 207, the lens microcomputer 230 refers to the detected position of the right eye optical system 210R and Table 1 stored in the storage unit 500, and calculates a correction amount from the change amount of the imaging position due to inertia and backlash. Next, in step S208, the lens driving unit 420R drives the right eye optical system 210R based on the driving direction stored in Table 2 of the storage unit 500 and the correction amount determined by the lens microcomputer 230 so as to reduce an unintended focus difference between the left and right.

[0035] According to this embodiment, even if the position of the right eye optical system 210R changes due to inertia and backlash, the focus difference between the left and right can be reduced, and the number of adjustments required by the user can be reduced. Furthermore, the reduction in the number of adjustments leads to power saving. EXAMPLES

[0036] Next, a description will be given of a second embodiment of the present invention. This embodiment is a modification of the correction method of the first embodiment, and the basic configurations of the lens apparatus 200 and the camera body 110 are the same as those of the first embodiment.

[0037] A correction method in this embodiment (a method for correcting left and right focus difference caused by inertia or backlash) will be described with reference to Fig. 7. Fig. 7 is a flowchart showing the correction method in this embodiment. When a user feels something is wrong with the left and right images, in step S301, the user switches the mode switching SW 220, and the lens microcomputer 230 starts the left and right focus difference adjustment mode.

[0038] Next, in step S302, the user operates the operation unit 240, and the lens microcomputer 230 drives the lens driving unit 420R. Next, in step S303, the storage unit 500 stores the driving direction of the lens driving unit 420R. The latest driving direction is overwritten in the storage unit 500, and only the final driving direction needs to be stored. Next, in step S304, the user determines whether or not the left and right focus difference has disappeared and there is no sense of incongruity in the left and right images. If it is determined that there is incongruity in the left and right images, the process returns to step S302. On the other hand, if it is determined that there is no incongruity in the left and right images, the process proceeds to step S305. In step S305, the user operates the mode switching SW 220 to switch to the shooting mode and ends the left and right focus difference adjustment mode.

[0039] Next, in step S306, the lens microcomputer 230 detects the position of the right eye optical system 210R using a sensor (not shown). Next, in step S307, the lens microcomputer 230 refers to the detected position of the right eye optical system 210R and Table 1 stored in the storage unit 500, and calculates a correction amount from the change amount of the imaging position due to inertia and backlash.

[0040] Next, in step S308, the camera microcomputer 140 detects the amount of deviation between the left and right imaging positions (the difference between the first imaging position and the second imaging position) using the image sensor 120 and the signal processing circuit 130. The amount of deviation between the imaging positions is acquired based on the phase difference between the optical image formed by the left eye optical system 210L and the optical image formed by the right eye optical system 210R acquired by the image sensor 120. Then, the camera microcomputer 140 transmits the detected amount of deviation to the lens microcomputer 230.

[0041] Next, in step S309, the lens microcomputer 230 determines whether or not the value (additive value) obtained by adding and subtracting the correction amount calculated in step S307 and the deviation amount of the imaging position received from the lens microcomputer 230 exceeds the allowable range D of the left and right focus difference. If it is determined that the added value is within the allowable range D, the lens driving process is terminated. On the other hand, if it is determined that the added value is outside the allowable range D, the lens driving unit 420R drives the right eye optical system 210R by the driving amount determined by the lens microcomputer 230 in the driving direction stored in Table 2 of the storage unit 500.

[0042] In this way, the lens device 200 acquires the amount of deviation of the imaging positions of the left and right optical systems from the camera body 110, and acquires the amount of deviation of the imaging positions due to inertia and backlash from the storage unit 500. Then, the acquired amount of deviation of the imaging positions of the left and right optical systems and the amount of deviation of the imaging positions due to inertia and backlash are calculated. If the calculation result (amount of deviation of the imaging positions + correction amount) exceeds the allowable range D of the left and right focus difference, correction is performed. On the other hand, if the calculation result does not exceed the allowable range D, correction is not performed.

[0043] According to this embodiment, not only the number of adjustments by the user is reduced, but also unnecessary correction is not performed, so that the number of times the lens driving unit 420R is driven is reduced, leading to more power saving than in the first embodiment. EXAMPLES

[0044] Next, a third embodiment of the present invention will be described. In this embodiment, a method of correcting the left and right focus difference caused by temperature will be described.

[0045] First, an imaging device 100a in this embodiment will be described with reference to Fig. 8. Fig. 8 is a block diagram of the imaging device 100a. The imaging device 100a has a camera body 110 and a lens device (interchangeable lens) 200a that is detachable from the camera body 110. The lens device 200a differs from the lens device 200 of the first and second embodiments in that it has a temperature detection unit 250 that detects temperature (ambient temperature). Note that other configurations of the imaging device 100a are common to the imaging devices 100 of the first and second embodiments, and therefore descriptions thereof will be omitted.

[0046] When the shape of lenses and components changes due to temperature changes, the imaging position of the optical image also changes. Therefore, the imaging positions of the right eye optical system 210R and the left eye optical system 210L also change according to temperature. If the change in imaging position due to temperature were the same for the left and right optical systems, no focus difference would occur between the left and right. However, because the second driving means 400 is attached to the right eye optical system 210R, the imaging positions of the left and right optical systems do not change in the same way, and a focus difference occurs between the left and right.

[0047] In this embodiment, the storage unit 500 stores Table 3, Table 4, and Table 5 (correction tables) as shown in Fig. 9. Fig. 9 is an explanatory diagram of the correction tables in this embodiment. Tables 3 and 4 store the amount of change in the image formation position of the right eye optical system 210R and the image formation position of the left eye optical system 210L when the environmental temperature changes from a specific reference temperature (e.g., 25°C). Table 5 stores the environmental temperature when the left-right focus difference adjustment mode is set.

[0048] First, an outline of the correction method will be described. The lens microcomputer 230 detects the environmental temperature T0 (°C) when the left-right focus difference adjustment mode is set, using the temperature detection unit 250. Then, the lens microcomputer 230 stores the environmental temperature T0 (°C) in the storage unit 500. When the environmental temperature T1 (°C) changes from the temperature T0 stored in the storage unit 500, the lens microcomputer 230 corrects the amount of change in the imaging position of the right eye optical system 210R and the left eye optical system 210L due to the temperature change. For example, the lens microcomputer 230 uses Table 3 and Table 4 stored in the storage unit 500 to perform correction so that the amount of change in the imaging position of the right eye optical system 210R becomes the same as the amount of change in the left eye optical system 210L.

[0049] In this embodiment, Table 3 and Table 4 are created based on the results of many units in the manufacturing process, but they may be created by measuring each unit. As a more specific correction method, for example, the temperature (ambient temperature) when the left-right focus difference adjustment mode is set is 26°C, and correction when the ambient temperature changes to 27°C is considered. In this case, the lens microcomputer 230 refers to Table 3 and Table 4 and calculates the amount of change when the ambient temperature changes to 27°C with 26°C as the reference. At this time, the imaging position of the left eye optical system 210L changes by (TL2)-(TL1), and the imaging position of the right eye optical system 210R changes by (TR2)-(TR1).

[0050] Next, when the amount of change in the right-eye optical system 210R is calculated based on the amount of change in the left-eye optical system 210L so that the amount of change in the imaging position of the right-eye optical system 210R is the same as that of the left-eye optical system 210L, the result is ((TL2)-(TL1))-((TR2)-(TR1)). By driving the lens driving unit 420R so that the imaging position of the right-eye optical system 210R changes by this value, no focus difference between the left and right is generated even if the temperature changes.

[0051] Next, the correction method in this embodiment will be described with reference to Fig. 10. Fig. 10 is a flowchart showing the correction method in this embodiment. First, in step S401, the lens microcomputer 230 uses the temperature detection unit 250 to acquire the temperature (environmental temperature) T0 when the mode is switched to the shooting mode and the adjustment in the left-right focus difference adjustment mode is completed. Next, in step S402, the temperature detection unit 250 detects the temperature (environmental temperature) T1.

[0052] Next, in step S403, lens microcomputer 230 determines whether or not temperature T1 detected in step S402 has changed from temperature T0 acquired in step S401 (whether or not the temperature detected by temperature detection unit 250 has changed). Whether or not the temperature has changed is determined, for example, by whether or not the amount of change in the temperature detected by temperature detection unit 250 has exceeded a predetermined amount.

[0053] If it is determined that the temperature T1 has not changed from the temperature T0, the process returns to step S402. On the other hand, if it is determined that the temperature T1 has changed from the temperature T0, the process proceeds to step S404. In step S404, the lens microcomputer 230 refers to Table 3 and Table 4 stored in the storage unit 500, and acquires the amount of change in the imaging position at the environmental temperatures T0 and T1 for each of the right eye optical system 210R and the left eye optical system 210L.

[0054] Next, in step S405, the lens microcomputer 230 calculates a correction amount that makes the change amount of the imaging position of the right eye optical system 210R equal to the change amount of the imaging position of the left eye optical system 210L, based on each change amount acquired in step S404. Next, in step S406, the lens driving unit 420R drives the right eye optical system 210R by the correction amount calculated by the lens microcomputer 230.

[0055] According to this embodiment, even if a temperature change occurs, the focus difference between the left and right is constant, and it is possible to save the user the trouble of readjusting the focus difference. Furthermore, the reduction in the number of adjustments leads to power saving. EXAMPLES

[0056] Next, a fourth embodiment of the present invention will be described. This embodiment is a modification of the correction method of the third embodiment, and the basic configurations of the lens device 200a and the camera body 110 are the same as those of the third embodiment.

[0057] The correction method in this embodiment will be described with reference to FIG. 11. FIG. 11 is a flowchart showing the correction method in this embodiment. First, in step S501, the lens microcomputer 230 acquires the temperature (environmental temperature) T0 when the adjustment in the left-right focus difference adjustment mode is completed by switching to the shooting mode using the temperature detection unit 250. Next, in step S502, the camera microcomputer 140 detects the amount of deviation (difference between the first image formation position and the second image formation position) between the left and right image formation positions using the image sensor 120 and the signal processing circuit 130. The amount of deviation of the image formation positions is acquired based on the phase difference between the optical image formed by the left eye optical system 210L and the optical image formed by the right eye optical system 210R acquired by the image sensor 120. Then, the camera microcomputer 140 transmits the detected amount of deviation to the lens microcomputer 230. Next, in step S503, the temperature detection unit 250 detects the temperature (environmental temperature) T1.

[0058] Next, in step S504, the lens microcomputer 230 determines whether the temperature T1 detected in step S503 has changed from the temperature T0 acquired in step S501. If it is determined that the temperature T1 has not changed from the temperature T0, the process returns to step S503. On the other hand, if it is determined that the temperature T1 has changed from the temperature T0, the process proceeds to step S505. In step S505, the lens microcomputer 230 refers to Table 3 and Table 4 stored in the storage unit 500, and acquires the amount of change in the imaging position at the environmental temperatures T0 and T1 for each of the right eye optical system 210R and the left eye optical system 210L.

[0059] Next, in step S506, the lens microcomputer 230 calculates a correction amount that makes the change amount of the imaging position of the right eye optical system 210R equal to the change amount of the imaging position of the left eye optical system 210L, based on each change amount acquired in step S505. Next, in step S406, the lens driving unit 420R drives the right eye optical system 210R by the correction amount calculated by the lens microcomputer 230.

[0060] Next, in step S507, the lens microcomputer 230 determines whether or not the value (additive value) obtained by adding and subtracting the correction amount calculated in step S506 and the deviation amount of the imaging position received from the lens microcomputer 230 exceeds the allowable range D of the left and right focus difference. If it is determined that the added value is within the allowable range D, the lens driving process is terminated. On the other hand, if it is determined that the added value is outside the allowable range D, the lens driving unit 420R drives the right eye optical system 210R by the driving amount determined by the lens microcomputer 230 in the driving direction stored in table 2 of the storage unit 500.

[0061] In this embodiment, the lens device 200a acquires the shift amount of the imaging positions of the left and right optical systems from the camera body 110, and acquires the shift amount due to the temperature of the left and right optical systems from the storage unit 500. Then, the lens device 200 calculates the acquired shift amount of the imaging positions of the left and right optical systems and the shift amount of the imaging positions of the left and right optical systems due to temperature. If the calculation result (shift amount of the imaging positions + correction amount) exceeds the allowable range D of the left and right focus difference, correction is performed. On the other hand, if the calculation result does not exceed the allowable range D, correction is not performed. Therefore, since unnecessary correction is not performed, there is no need to drive the lens driving unit 420R, which leads to further power saving. In other words, correction is performed when the temperature changes to an extent that the user feels discomfort in the left and right images, but correction is not performed otherwise, so there is no need to drive the lens driving unit 420R, which leads to more power saving than in the third embodiment.

[0062] In each embodiment, it is described that the left eye optical system 210L and the right eye optical system 210R are entirely extended, but the imaging position may be moved by driving at least one lens. That is, the first driving means 300 may drive at least one lens of the left eye optical system 210L and at least one lens of the right eye optical system 210R to move the first imaging position and the second imaging position simultaneously. Similarly, the second driving means 400 may drive at least one lens of the right eye optical system 210R to move the second imaging position. In each embodiment, the first driving means 300 may move the first imaging position and the second imaging position simultaneously by entirely extending the left eye optical system 210L and the right eye optical system 210R, and the second driving means 400 may move a partial group of the right eye optical system 210R to move the second imaging position.

[0063] (Other Examples) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-mentioned embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions.

[0064] According to each embodiment, it is possible to provide a lens device, an imaging device, a control method for the lens device, and a program that can appropriately adjust the focus difference between a pair of images formed by two optical systems with low power consumption.

[0065] The disclosure of each embodiment includes the following configurations and methods. (Configuration 1) A first optical system; A second optical system arranged in parallel with the first optical system; a first drive unit that drives the first optical system and the second optical system to simultaneously move a first imaging position of a first optical image formed by the first optical system and a second imaging position of a second optical image formed by the second optical system; a second driving unit that drives the second optical system to move the second imaging position of the second optical image formed by the second optical system; a storage unit that stores information regarding a relative change between the first imaging position and the second imaging position; a control unit that uses the information to control the second driving unit and corrects the relative position between the first imaging position and the second imaging position. (Configuration 2) 2. The lens device according to configuration 1, wherein the information is information regarding at least one of the inertia and the backlash of the second optical system. (Configuration 3) 3. The lens apparatus according to claim 2, wherein the storage section stores the information for each focus position of the second optical system. (Configuration 4) A switching unit capable of switching between the first mode and the second mode by a user operation is further provided, The lens device described in configuration 2 or 3, wherein the control unit corrects the relative position between the first imaging position and the second imaging position when the switching unit switches from the first mode to the second mode. (Configuration 5) The control unit is In the first mode, the first drive unit is controlled; 5. The lens device according to configuration 4, wherein in the second mode, the second driving section is controlled. (Configuration 6) the storage unit stores a driving direction when the second optical system is driven by the second driving unit in the second mode, The lens device described in configuration 4 or 5, characterized in that when switching from the second mode to the first mode, the control unit corrects the relative position between the first imaging position and the second imaging position based on the driving direction at the end of driving of the second driving unit and the information regarding at least one of the inertia or the backlash. (Configuration 7) The lens device described in any one of configurations 2 to 6, wherein the control unit controls the second drive unit so that a sum of a difference between the first imaging position and the second imaging position and a correction amount of the second imaging position based on the information regarding at least one of the inertia or the backlash falls within a predetermined range. (Configuration 8) 2. The lens device according to claim 1, wherein the information is information regarding temperature. (Configuration 9) Further comprising a temperature detection unit for detecting a temperature, the storage unit stores information regarding a first change amount of the first imaging position and a second change amount of the second imaging position for each temperature; The lens device described in configuration 8, wherein the control unit corrects the relative position between the first imaging position and the second imaging position based on the temperature detected by the temperature detection unit and the information regarding the first change amount and the second change amount. (Configuration 10) The lens device described in configuration 9, characterized in that the control unit corrects the relative position between the first imaging position and the second imaging position when it determines that the temperature detected by the temperature detection unit has changed. (Configuration 11) The lens device described in any one of configurations 8 to 10, characterized in that the control unit controls the second drive unit so that a sum of a difference between the first imaging position and the second imaging position and a correction amount of the second imaging position based on the information regarding the temperature falls within a predetermined range. (Configuration 12) 12. The lens device according to any one of configurations 1 to 11, wherein the control unit controls the second drive unit so as to reduce a deviation between the first imaging position and the second imaging position. (Configuration 13) 13. An imaging device comprising the lens device according to any one of configurations 1 to 12 and an imaging element. (Configuration 14) 14. The imaging apparatus according to configuration 13, wherein the lens device is detachable from a camera body having the imaging element. (Configuration 15) 15. The imaging device according to configuration 13 or 14, wherein the imaging element is capable of acquiring a phase difference between the first optical image and the second optical image. (Configuration 16) The imaging device described in configuration 15, characterized in that the control unit corrects the relative position based on a difference between the relative positions of the first imaging position and the second imaging position acquired based on the phase difference. (Configuration 17) the first driving unit moves the first imaging position and the second imaging position simultaneously by extending the first optical system and the second optical system as a whole; 17. The imaging device according to any one of configurations 1 to 16, wherein the second drive section moves a partial group of the second optical system to move the second imaging position. (Method 1) 1. A method for controlling a lens apparatus having a first optical system and a second optical system arranged in parallel with the first optical system, comprising: a step of driving at least one lens of the first optical system and at least one lens of the second optical system using a first driving unit to simultaneously move a first imaging position of a first optical image formed by the first optical system and a second imaging position of a second optical image formed by the second optical system; driving at least one lens of the second optical system using a second driving unit to move the second imaging position of the second optical image formed by the second optical system; A method for controlling a lens device, comprising the steps of controlling the second drive unit using information regarding a relative change between the first imaging position and the second imaging position, and correcting the relative position between the first imaging position and the second imaging position. (Configuration 18) A program for causing a computer to execute the lens apparatus control method according to Method 1.

[0066] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0067] 200 Lens device 210L Left eye optical system (1st optical system) 210R Right eye optical system (second optical system) 230 Lens microcomputer (control unit) 300 First driving means (first driving unit) 400 Second driving means (second driving unit) 500 storage section

Claims

1. A first optical system; A second optical system arranged in parallel with the first optical system; a first drive unit that drives at least one lens of the first optical system and at least one lens of the second optical system to simultaneously move a first imaging position of a first optical image formed by the first optical system and a second imaging position of a second optical image formed by the second optical system; a second driving unit that drives at least one lens of the second optical system to move the second imaging position of the second optical image formed by the second optical system; a storage unit that stores information regarding a relative change between the first imaging position and the second imaging position; a control unit that uses the information to control the second driving unit and corrects a relative position between the first imaging position and the second imaging position.

2. 2. The lens apparatus according to claim 1, wherein the information is information regarding at least one of the inertia and the backlash of the second optical system.

3. 3. The lens apparatus according to claim 2, wherein the storage unit stores the information for each focus position of the second optical system.

4. A switching unit that can switch between the first mode and the second mode by a user operation is further provided, The lens device according to claim 2 , wherein the control unit corrects the relative position between the first image-forming position and the second image-forming position when the switching unit switches from the first mode to the second mode.

5. The control unit is In the first mode, the first drive unit is controlled; 5. The lens device according to claim 4, wherein in the second mode, the second driving unit is controlled.

6. the storage unit stores a driving direction when the second optical system is driven by the second driving unit in the second mode, The lens device according to claim 4, characterized in that, when switching from the second mode to the first mode, the control unit corrects the relative position between the first imaging position and the second imaging position based on the driving direction at the end of driving of the second driving unit and the information regarding at least one of the inertia or the backlash.

7. The lens device according to claim 2, characterized in that the control unit controls the second drive unit so that a sum of a difference between the first imaging position and the second imaging position and a correction amount of the second imaging position based on the information regarding at least one of the inertia or the backlash falls within a predetermined range.

8. The lens device according to claim 1 , wherein the information is information regarding temperature.

9. The temperature detector (250) detects a temperature. the storage unit stores information regarding a first change amount of the first imaging position and a second change amount of the second imaging position for each temperature, The lens device according to claim 8, characterized in that the control unit corrects the relative position between the first imaging position and the second imaging position based on the temperature detected by the temperature detection unit and the information regarding the first change amount and the second change amount.

10. The lens device according to claim 9 , wherein the control unit corrects the relative position between the first image-forming position and the second image-forming position when it determines that the temperature detected by the temperature detection unit has changed.

11. The lens device according to claim 8, characterized in that the control unit controls the second driving unit so that a sum of a difference between the first imaging position and the second imaging position and a correction amount of the second imaging position based on the information regarding the temperature falls within a predetermined range.

12. The lens device according to claim 1 , wherein the control unit controls the second drive unit so that a deviation between the first image-forming position and the second image-forming position becomes small.

13. An imaging device comprising: a lens device according to claim 1 ; and an imaging element.

14. The imaging apparatus according to claim 13 , wherein the lens device is detachable from a camera body having the imaging element.

15. 14. The imaging apparatus according to claim 13, wherein the imaging element is capable of obtaining a phase difference between the first optical image and the second optical image.

16. 16. The imaging apparatus according to claim 15, wherein the control unit corrects the relative position based on a difference between the relative position between the first imaging position and the second imaging position acquired based on the phase difference.

17. the first driving unit moves the first imaging position and the second imaging position simultaneously by extending the first optical system and the second optical system as a whole; The imaging apparatus according to claim 1 , wherein the second driving section moves a subgroup of the second optical system to move the second imaging position.

18. 1. A method for controlling a lens apparatus having a first optical system and a second optical system arranged in parallel with the first optical system, comprising: a step of driving at least one lens of the first optical system and at least one lens of the second optical system using a first driving unit to simultaneously move a first imaging position of a first optical image formed by the first optical system and a second imaging position of a second optical image formed by the second optical system; driving at least one lens of the second optical system using a second driving unit to move the second imaging position of the second optical image formed by the second optical system; A method for controlling a lens device, comprising the steps of controlling the second drive unit using information regarding a relative change between the first imaging position and the second imaging position, and correcting the relative position between the first imaging position and the second imaging position.

19. A program for causing a computer to execute the method for controlling a lens apparatus according to claim 18.

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