Optical apparatus

Abstract

To set the operational range of a focus ring according to the moving range of the focus lens.SOLUTION: An optical apparatus includes: a lens which moves in the direction of an optical axis; a lens barrel for holding the lens; an operational member movable to the lens barrel, the operational member receiving an instruction to move the lens by being moved; and a setting unit for setting the moving amount of the operational member necessary to move the lens in the movable range of the lens by moving the operational member.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to optical instruments. [Background technology]

[0002] A lens mirror with a focus ring for manual focus adjustment There are photographing devices equipped with a focus ring. Various methods for operating the focus ring have been proposed. do. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. WO2016 / 052418 Summary of the Invention

[0004] The optical device according to one aspect of the disclosed technique includes a lens that moves in an optical axis direction and a lens holder that holds the lens. a lens barrel that holds the lens, and a lens barrel that is movable relative to the lens barrel and that moves the lens. and a control member for controlling the lens to move within a movable range of the lens. a setting unit that sets the amount of movement of the operation member required to move the operation member by moving the operation member; , has. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a block diagram illustrating an example of a hardware configuration of an optical device according to the first embodiment. [Diagram 2] FIG. 2 is an explanatory diagram showing the set rotation stroke. [Diagram 3] FIG. 3 is an explanatory diagram of the focus ring of the lens barrel viewed from the image side in a plane perpendicular to the optical axis. [Figure 4]FIG. 4 is an explanatory diagram showing an example of setting a rotation stroke using the display screen of the rear monitor. [Diagram 5] FIG. 5 is an explanatory diagram showing the contents of a first conversion table indicating the relationship between the movement amount of the focus lens and the reciprocal of the shooting distance (1 / shooting distance). [Figure 6] FIG. 6 is a flowchart illustrating an example of a process procedure for driving the focus lens when the shooting distance range is limited in the optical device according to the first embodiment. [Figure 7] FIG. 7 is a flowchart illustrating a detailed example of a processing procedure of the pre-operation position detection process (step S602) according to the first embodiment. [Figure 8] FIG. 8 is a flowchart illustrating an example of a detailed processing procedure of the operation sensitivity calculation process (step S603) according to the first embodiment. [Figure 9] FIG. 9 is a diagram showing parameters used in the operation sensitivity calculation process (step S603). [Figure 10] FIG. 10 is a flowchart illustrating a detailed example of a processing procedure of the 1 / RA restriction process (step S604) according to the first embodiment. [Figure 11] FIG. 11 is a flowchart illustrating a detailed example of the operation amount calculation process (step S605) according to the first embodiment. [Figure 12] FIG. 12 is a flowchart illustrating a detailed example of the target position determination process (step S606) according to the first embodiment. [Figure 13] FIG. 13 is a diagram illustrating a drive process of the focus lens according to the first embodiment. [Figure 14] FIG. 14 is a block diagram illustrating an example of a hardware configuration of the optical device according to the second embodiment. As illustrated in FIG. [Figure 15] FIG. 15 is an explanatory diagram of an example of the contents stored in the second conversion table. [Figure 16] FIG. 16 is a flowchart illustrating an example of a driving process procedure for the focus lens 103 performed by the optical device according to the second embodiment. [Figure 17]FIG. 17 is a flowchart illustrating an example of detailed processing steps of the operation sensitivity calculation process (step S1603) according to the second embodiment. [Figure 18] FIG. 18 is a diagram showing parameters used in the operation sensitivity calculation process (step S1704). [Figure 19] FIG. 19 is a flowchart of a detailed process procedure example of the 1 / RA restriction process (step S1603) according to the third embodiment. [Figure 20] FIG. 20 is a diagram relating to the drive process of the focus lens according to the second embodiment. [Figure 21] FIG. 21 is an explanatory diagram showing an example of user setting of the movement range of the focus lens. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] Hereinafter, the optical device will be described in two embodiments, embodiment 1 and embodiment 2, with reference to the accompanying drawings. In the following embodiments, an image pickup device and a lens mirror that can be attached to and detached from the image pickup device are used as an example of an optical device. The lens barrel may be integrated with the imaging device. The present embodiment describes an optical device that allows a user to set a limit on the shooting distance. Now, an optical device in which the optical system is a zoom lens will be described.

[0007] [Embodiment 1] In this embodiment, the optical device is provided with a rotatable focus ring around the lens barrel. An image pickup apparatus according to the present embodiment will be described. In the optical device of this embodiment, a focus ring is rotated. The focus ring will rotate by the set angle (rotation angle). The lens moves from the closest position to the infinity position.

[0008] <Configuration of imaging device> FIG. 1 is a block diagram showing a hardware configuration of an optical device 100 according to a first embodiment. The lens barrel 101 includes an optical system that includes a focus lens 103 and forms an image of a subject. In addition to the focus ring 104, the lens side control unit 300, the aperture 303, and the photo An interrupter (PI) 304, a focus lens holder 305, a first motor 306, A second motor 307, a motor drive control unit 308, an encoder (EC) 309, and a touch It has a sensor 310 and a lens side operation device 311.

[0009] The lens side control unit 300 controls the lens barrel 101. The lens side processor 301 and the lens side memory 302 are included. 1 executes a program that controls the lens barrel 101. The lens-side memory 302 The lens side memory 302 is a work area for the lens side processor 301. The memory 302 stores the programs executed by the lens side processor 301 and the like.

[0010] Specifically, for example, the lens side memory 302 stores the rotation angle of the focus ring 104. A rotation range setting program that sets the rotation stroke, which is the rotation range, and a focus ring A movement range setting program for setting the movement range of 104 is stored. The program for setting the gram and the movement range is executed by the lens side processor 301.

[0011] The aperture 303 adjusts the amount of light passing through the optical system that forms the image of the subject. The sensor 304 detects the position of the focus lens 103 in the direction of the optical axis O and outputs a detection signal to the lens. The lens position sensor 304 outputs the signal to the lens side control unit 300. The focus lens holder 305 holds the focus lens 103 and aligns the optical axis O It can move parallel to the

[0012] The first motor 306 moves the focus lens holder 305 in parallel with the optical axis O. The first motor 307 opens and closes the aperture 303. The motor drive control unit 308 controls the first motor 3 The rotation angle sensor 309 drives and controls the focus ring 306 and the second motor 307. The rotation angle sensor 3 detects the rotation angle of the lens 104 and outputs a detection signal to the lens side control unit 300. 09 is, for example, an encoder.

[0013] The touch sensor 310 is an annular touch sensor provided on the circumferential surface of the lens barrel 101 with the optical axis O at its center. The focus ring 104 has a touch surface. The touch position of the user's finger on the touch surface is detected by the focus ring 104. The touch sensor 310 corresponds to the start and end points of the rotation stroke. The contact position of the touch sensor is detected and a detection signal is output to the lens side control unit 300.

[0014] The lens side operation device 311 may be, for example, a slide switch, a button, a function An operation device such as a keypad or a touch panel for performing necessary operations on the lens barrel 101. The imaging device 102 includes an imaging element 320, a body side control unit 323, and a body side operation device. vice 327, an electronic viewfinder (EVF) 328, an eyepiece sensor 329, and an eyeball An authentication image sensor 330, a rear monitor 331, a card IF 332, and a memory card 33 3 and a communication IF 334. These are connected to a bus 335.

[0015] The image sensor 320 of the image pickup device 102 passes through an optical system having a focus lens 103. The image sensor 320 receives light from the subject, converts it into an electrical signal, and outputs image data. The imaging unit 321 includes an imaging section 321 and a signal processing section 322. The imaging unit 321 includes, for example, an XY Address type solid-state image sensor (e.g., CMOS (Complementary Metal Oxide Semiconductor) The sensor may be a galvanic-oxide semiconductor (TGA) sensor. A solid-state image sensor using the 2D scanning method (such as CCD (Charge Coupled Device) ice).

[0016] A plurality of light receiving elements (pixels) are arranged in a matrix on the light receiving surface of the imaging unit 321. The pixels of the image sensor 320 are each provided with a plurality of types of light that transmit different color components. The color filters are arranged according to a predetermined color array (for example, a Bayer array). Therefore, each pixel of the imaging unit 321 corresponds to each color component by color separation by the color filter. It outputs an analog electrical signal.

[0017] The signal processing unit 322 performs signal processing on the analog electrical signal from the imaging unit 321. The signal processing unit 322 is an analog front-end circuit. Log signal processing (correlated double sampling, black level correction, etc.), A / D conversion processing, digital Signal processing (defective pixel correction, etc.) is performed sequentially to generate image data, which is then output to the LSI326 do.

[0018] The body side control unit 323 controls the imaging device 102. The body side processor 324, the body side memory 325, and the LSI 326. The body side processor 324 executes a program for controlling the image capture device 102. The body side memory 325 is a working area for the body side processor 324. The component 5 stores various data and programs executed by the body side processor 324 .

[0019] Specifically, for example, the body side memory 325 stores the rotation angle of the focus ring 104. A rotation range setting program for setting the rotation stroke and a movement range of the focus lens 103 A program for setting a rotation range may be stored. The movement range setting program is executed by the body side processor 324. The setting program and the movement range setting program are executed by the body side processor 324 and the lens It does not matter which processor 301 executes it.

[0020] The LSI 326 performs color interpolation, white balance, and other operations on the image data from the signal processing unit 322. Image processing such as contrast adjustment, edge emphasis, gamma correction, and tone conversion, as well as encoding, decoding, and compression LSI326 is an integrated circuit that performs specific processing, such as compression and expansion. For example, ASIC (Application Specific Integrated Circuit d Circuit) and FPGA (Field-Programmable Gate PLDs (Programmable Logic Devices) such as Therefore, this may be realized.

[0021] The body side operation device 327 inputs commands and data to the body side control unit 323. The body side operation device 327 is, for example, a release button, a video shooting button, The camera includes a switch for switching between still and video modes. The interface 327 is realized by, for example, various buttons, switches, dials, and a touch panel. The EVF 328 is a viewfinder that electronically displays an image. If it is for a SLR camera, the image capture device 102 may have an optical viewfinder (not shown). stomach.

[0022] The eye sensor 329 detects when the user places his / her eye on the EVF 328. When the eyepiece is detected, the body side control unit 323 displays an image of the subject on the EVF 328 and When the eyeball authentication image sensor 3 is no longer detected, the image of the subject is not displayed on the EVF 328. Reference numeral 30 denotes an image sensor that captures an image of an eyeball when the eyeball is placed close to the EVF 328. The camera 330 outputs captured eye image data to the body side control unit 323.

[0023] The rear monitor 331 displays the image of the subject and the setting screen. The card IF 332 is an interface into which a memory card 333 can be inserted and removed. 333 and outputs it to the body side control unit 323, 3 to the memory card 333. Memorize.

[0024] The communication IF 334 is communicably connected to a communication device 340. The communication device 340 may be, for example, For example, the image capturing apparatus 102 may be remotely controlled by a remote controller, a smartphone, or another image capturing apparatus. In addition, in the case of an imaging device with an integrated lens barrel 101, the lens side control unit 300 The body side control unit 323 executes the processing by the lens side control unit 300. This will be the case.

[0025] <Lens barrel rotation stroke setting> Next, the rotation stroke, which is the angle (rotation angle) of the focus ring, is determined by the lens barrel. This section explains how to set it up.

[0026] FIG. 2 is an explanatory diagram showing the set rotation stroke. The optical device 100 has a lens mirror. The lens barrel 101 and the imaging device 102, which is the camera body, are shown in FIG. 101 is a cross-sectional view of an optical system for forming an image of a subject, the cross-sectional view being perpendicular to the optical axis O, as viewed from the image side. 2B is a cross-sectional view taken along a plane including the optical axis O of lens barrel 101.

[0027] The lens barrel 101 includes a focus lens 103 and a ring-shaped focus ring 104. The focus lens 103 moves in the direction of the optical axis O to focus the image by the optical system. The focus ring 104 is a focus ring that changes the position of the object image formed by the focus lens. It is an annular operating member provided on the circumferential surface of lens barrel 101 so as to be rotatable about optical axis O. By rotating the focus ring 104 around the optical axis O, the focus lens 103 moves in a direction parallel to the optical axis O.

[0028] In FIG. 2A, r1 indicates the direction of rotation of the focus ring 104 in the clockwise direction. r1 is the rotation direction in which the focus ring 104 rotates counterclockwise, and r2 is the rotation direction in which the focus ring 104 rotates counterclockwise. 0, P1, and P2 are positions on the circumference of the lens barrel 101.

[0029] The rotation angle of the focus ring 104 around the optical axis O is defined as θ. When the focus ring 10 rotates in the rotation direction r1 by the rotation angle θ1, the focus ring 10 4 moves to position P1. Similarly, the focus ring 104 rotates in the direction r2. When the focus ring 104 rotates by a rotation angle θ2, the portion Q of the focus ring 104 that was at the circumferential position P0 becomes Move to position P2. In this case, the rotation angle θ1+θ2 corresponding to the distance from position P1 to position P2 is the rotation stroke. become.

[0030] In FIG. 2B, X1 is the time when the focus ring 104 rotates in the rotation direction r1. X1 is a direction parallel to the optical axis O and is the direction of movement of the focus lens 103 when the X1 corresponds to the rotation direction r1. X2 corresponds to the rotation direction of the focus ring 1. X2 is the movement direction of the focus lens 103 when the focus lens 103 rotates in the rotation direction r2. , which is parallel to the optical axis O and faces the image side. X2 corresponds to the rotation direction r2.

[0031] E0, E1, and E2 indicate the positions of the focus lens 103 on the optical axis O, The positions P0, P1, and P2 correspond to the positions Q of the focus ring 104. In particular, E0 is the position of the focus lens 103 immediately before the operation by the focus ring 104. E1 is the end of the moving range of the focus lens 103 on the subject side. E2 is d1 is the image side end of the moving range of the focus lens 103. d2 indicates the distance traveled between positions E0 and E2 and corresponds to the rotation angle θ1. d indicates the movement distance between positions E1 and E2, and corresponds to the rotation angle θ.

[0032] That is, when the focus lens 103 is positioned at E0, the focus When the portion Q of the cast ring 104 rotates from the position P0 in the rotation direction r1 by the rotation angle θ1, The focus lens 103 moves in the X1 direction by a distance d1 corresponding to the rotation angle θ1 to E1. Located.

[0033] When the focus lens 103 is positioned at E0, the focus When the portion Q of the ring 104 rotates from the position P0 in the rotation direction r2 by the rotation angle θ2, the focus The lens 103 moves in the X2 direction by a distance d2 corresponding to the rotation angle θ2 to reach E2. Next, we will explain how to set the rotation stroke for an interchangeable lens.

[0034] FIG. 3 is an image of the focus ring 104 of the lens barrel 101 in a plane perpendicular to the optical axis O. First, when the rotation stroke is set as shown in the upper part of the chart in FIG. )~(c) will be used to explain.

[0035] The rotation strokes in (a), (b), and (c) of FIG. 3 refer to the movement of the focus lens 103. The rotation angles θa, θb, and θc of the focus ring 104 correspond to the ranges. Point A in 3 is the starting point of the rotation stroke, and point B is the end point of the rotation stroke. In this setting, the rotation angle θ for moving the focus lens 103 is set. The relationship between the rotation strokes of (a) to (c) is expressed by the following formula (1).

[0036] θa<θb<θc (1)

[0037] Points A and B are, for example, when the user's finger is placed on or near the focus ring 104. The setting can be done by touching the touch sensor 310 (see FIG. 1). When setting a stroke angle of 360 degrees or more, touch the end point multiple times to set it. For example, in the case of (c) in Figure 3, the rotation stroke is between 360 and 720 degrees, so Touch position B twice to set it. If the angle is between 720 degrees and 1080 degrees, the B position will be Touch the device three times.

[0038] <Example of setting the rotation stroke using the display screen of the rear monitor 331> Also, points A and B are, for example, displayed on the rear monitor 331 (see FIG. 3) of the imaging device 102. Referring to the image of the focus ring 104 displayed on the display screen, the operation button on the display screen This can be set by pressing the

[0039] Alternatively, points A and B may be, for example, points on a rear monitor on which an image of the focus ring 104 is displayed. The settings can be made by touching the touch panel on the rear monitor 331. The rotation angle can also be set by directly specifying it on the setting screen shown in 331.

[0040] FIG. 4 is an explanatory diagram showing a method for setting a rotation stroke using the display screen of the rear monitor 331. The rear monitor 331 has a touch panel. The display screen 400 displays the following: The focus ring 104 of the lens barrel 101 in a plane perpendicular to the optical axis O as viewed from the image side. An image corresponding to the focus ring 401 and a confirmation button are displayed. Option 402 is displayed.

[0041] FIG. 4A shows focus ring 401 in an initial state before the rotation stroke is set. Point A is the starting point of the rotation stroke on the focus ring 104. The optical axis O is The line segment 403 connects the optical axis O and point A, and in FIG. This becomes one of the line segments that defines the range of the rotation angle θ that is set as the rotation stroke.

[0042] FIG. 4B shows a state where point A is specified by the user's finger 410. FIG. 4C shows a state where point A is specified by the user's finger 410. After pointing point A with finger 410 in (B) of 4, the focus ring 4 is rotated in the direction r1. The state of dragging the line segment 40 upwards is shown. Point A after the dragging is moved to point B. 4 connects the optical axis O and point B, and is the rotation stroke set in FIG. This is the other line segment that defines the range of the rotation angle θ. To set θc, drag your finger 410 from point A to rotate once in the direction r1, then Then drag it in the rotation direction r1 to the position of point B.

[0043] In FIG. 4D, the rotation angle θ formed by the optical axis O and the line segments 403 and 404 is the rotation stroke. When the user presses the confirmation button 402 with his / her finger 410, the The rotation angle θ is determined as the rotation stroke. The optical device 100 is stored in the memory 302. In addition, the rotation stroke of the optical device 100 once determined cannot be changed. The determined rotation stroke is read from the lens side memory 302 and the focus is adjusted until the determined rotation stroke is reached. Used to move the lens 103.

[0044] In addition to the above-mentioned method, the rotation stroke can be performed by using the lens side operation device 311 or the button. Alternatively, the setting may be performed by operating the camera-side operation device 327. The setting may be made by remotely inputting the operation using a communication device 340 capable of communicating with 02. For example, if a switch allows the user to select one of several rotation strokes, The user operates the switch to change the rotation stroke to the one desired by the user, The device 100 can set a rotation stroke selected by the user.

[0045] In addition, the rotation stroke may be stored in the lens side memory 302 for each user. For example, the rotation stroke of the corresponding user is specified on a setting screen (not shown) of the rear monitor 331. Also, the eyeball authentication image sensor 330 may capture an image of the eyeball of each user, and generate an eyeball image data. The data may be stored in the lens side memory 302 in association with the rotation stroke.

[0046] In this case, when the eye sensor 329 detects that the eye is brought close to the EVF 328, Then, the eye authentication image capturing element 330 captures an image of the eye. Eyeball image data whose characteristics match those of the image data are identified from the lens side memory 302. The rotation stroke associated with the eye image data may be retrieved.

[0047] In addition, a fingerprint authentication sensor (not shown) may be incorporated into the touch sensor 310. In this case, the fingerprint sensor acquires fingerprint feature data for each user and rotates the fingerprint feature data. The image may be stored in the lens side memory 302 in association with the stroke. When a user touches the touch sensor 310, the fingerprint authentication sensor acquires fingerprint feature data. The optical device 100 detects fingerprint feature data that matches the acquired fingerprint feature data. The rotation strip associated with the identified fingerprint feature data is then stored in the camera-side memory 302. The lock may be read.

[0048] The optical device 100 is also suitable for capturing images of landscapes, portraits, night scenes, sports, movies, and the like. A corresponding rotation stroke may be set for each shooting mode set in the device 102. In this case, the value of the rotation stroke corresponding to the shooting mode is stored in the body side memory 325. The optical device 100 sets the value of the rotation stroke corresponding to the set shooting mode to the body. The rotation stroke corresponding to the shooting mode is read from the lens side memory 325. It may be stored in memory 302.

[0049] The shooting mode can be set by the user using the body side operation device 327 of the imaging device 102. The shooting mode may be switched by the user communicating with the imaging device 102. Alternatively, the image capture device 102 may be indirectly operated by operating a communication device 340 capable of receiving data. In addition, the user can switch the shooting mode by operating the lens side operation device 31 of the lens barrel 101. This may be done by manipulating 1.

[0050] Next, the lens movement shown in the lower part of the chart in FIG. 3 will be explained using (a) to (c). In the lower part of the diagram of FIG. 3, (a) to (c), the focus ring 104 is rotated in the direction r When the focus lens 10 rotates by θa1, θb1, and θc1, as shown in FIG. 3 moves in the X1 direction by a distance d1 corresponding to the rotation angles θa1, θb1, and θc1, 1. In this case, θa1 / θa, θb1 / θb, and θc1 / θc are the same value.

[0051] In addition, when the focus ring 104 rotates in the rotation direction r2 by θa2, θb2, and θc2, As shown in FIG. 2, the focus lens 103 rotates at angles θa2, θb2, and θc2. The object moves in the X2 direction by a distance d2 corresponding to the distance θa2 / θa, and is located at E2. θb2 / θb and θc2 / θc have the same value.

[0052] <Relationship between rotation stroke and sensitivity of focus ring 104> In this way, the smaller the rotation stroke, the more sensitive the operation of the focus ring 104 becomes. The larger the value, the more insensitive the signal becomes (the more sensitive the signal becomes), and the larger the value, the more insensitive the signal becomes (the more sensitive the signal becomes). The smaller the rotation stroke, the smaller the focus per unit rotation angle of the focus ring 104. The amount of movement of the lens 103 becomes larger (sensitivity becomes higher), and the larger the rotation stroke, the The amount of movement of the focus lens 103 per unit rotation angle of the focus ring 104 is The sensitivity becomes smaller (the sensitivity becomes lower). Details of the operation sensitivity will be described later.

[0053] <Minimum and maximum rotation stroke> Next, the minimum and maximum values ​​of the rotation stroke are explained. The minimum rotation stroke (bottom) is determined by the detection resolution of the rotation angle sensor 309. The function is the rotation angle at which the rotation angle sensor 309 outputs one pulse as a detection signal. The number of pulses that can be output is determined by the torque and detection resolution.

[0054] That is, when the focus ring 104 is rotated by a rotation stroke, The rotation angle sensor 309 outputs a number of pulses obtained by dividing the clock by the detection resolution. If the number of pulses is small, the movement of the focus lens 103 becomes rough (the amount of movement per pulse is When the number of output pulses increases, the movement of the focus lens 103 becomes finer. (The amount of movement per pulse becomes smaller.)

[0055] For example, the movement range of the focus lens 103 is divided into 10 (10 pulses) at maximum. If the number of divisions is set to low, the rotation angle at which a detection signal of at least 10 pulses is output is the minimum rotation stroke. In other words, the minimum rotation stroke is 10 times the detection resolution.

[0056] The minimum number of divisions is not limited to 10, and may be set by the user. When dividing the movement range of the lens 103, it is not enough to divide it equally, but to divide it into the movement of the image plane. You can divide it so that the amount is equal, or so that the ratio is 1 / shooting distance. I don't.

[0057] If the rotation stroke set by the user is smaller than the minimum rotation stroke, it can be output. The number of pulses is reduced, and the amount of movement of the focus lens 103 according to the output of one pulse is increased. As a result, it becomes difficult for the user to focus on the subject with the focus lens 103. The higher the resolution of the rotation angle sensor 309, the smaller the minimum rotation stroke becomes. It becomes.

[0058] In order to focus on the subject, a focus lens that responds to the output of one pulse is required. It is preferable that the amount of movement of the image of the subject caused by the movement of 103 is within the focal depth. This value changes depending on the F-number of the optical system that forms the subject image. The minimum rotation stroke is The smaller the value, the larger the value may be.

[0059] The amount of movement of the image of the subject caused by the movement of the focus lens 103 according to the output of one pulse is the focus. The movement amount of the focus lens 103 within the point depth, the movement range of the focus lens 103 In this case, the number obtained by dividing the rotation angle sensor 309 by α may be set as the minimum division number (α). The rotation angle at which a pulse is output is the minimum rotation stroke.

[0060] The optical device 100 is configured such that the rotation stroke set by the user is smaller than the minimum rotation stroke. In this case, the rotation stroke is set to the minimum rotation stroke. In order to prompt the user to reset the rotation stroke, the rotation stroke set by the user is set to the minimum rotation stroke. The optical device 100 may output a sound as a warning. Also, information to that effect may be displayed on the rear monitor 331.

[0061] The maximum value of the rotation stroke (hereinafter, the maximum rotation stroke) is The driving resolution is determined by the driving resolution of the first motor 306. This is the minimum drive amount (movement amount) of the focus lens 103 that can be driven by the first If the motor 306 is a stepper motor, the stepper motor moves one step. The movement range of the focus lens 103 and the first The step of the focus lens corresponding to the movement range is determined by the driving resolution of the motor 306. The number is determined.

[0062] The number of pulses of the detection signal output from the rotation angle sensor 309 is calculated based on the stepping motor. The maximum rotation stroke is the rotation stroke that makes the number of steps of the motor equal to the rotation angle. The number of pulses of the detection signal output from the sensor 309 corresponds to the number of steps of the stepping motor. It is preferable to set the number of rotations to be larger than the number of steps, so that there is some margin for rotation operation. The rock may be considered as the maximum rotational stroke.

[0063] The optical device 100 is configured such that the rotation stroke set by the user is greater than the maximum rotation stroke. If so, the rotation stroke is set to the maximum rotation stroke. In order to prompt the user to reset the stroke, the rotation stroke set by the user is set to the maximum rotation stroke. The optical device 100 may output a sound as a warning. Also, information to that effect may be output to the rear monitor 331.

[0064] The minimum and maximum rotation strokes are set for each lens barrel 101. The minimum rotation stroke and the minimum rotation stroke are stored in the lens side memory 302. The maximum stroke is sent from the lens barrel 101 to the image capture device 102 as needed. Strokes may be stored in the lens-side memory 302 on a per-user basis.

[0065] <Relationship between focus lens movement amount and subject distance> In this embodiment, the subject image is imaged by the imaging unit 321 with respect to the amount of movement of the focus lens 103. The reciprocal of the distance to the subject (shooting distance) focused on the light receiving surface is in a linear relationship.

[0066] Figure 5 shows the relationship between the amount of focus lens movement and the inverse of the shooting distance (1 / shooting distance). FIG. 1 is an explanatory diagram showing the contents of the first conversion table 500. The first conversion table 500 is Lens position 501 is set to 1 / shooting distance 502, or 1 / shooting distance 502 is set to focus. 5 is a table for converting the lens position 501 into the lens position 501. The range of possible shooting distances (hereafter referred to as shooting distances) is shown as R1 to Rn. Here, the position of the focus lens 103 corresponding to the shooting distances R1 and Rn is FL1. and FLn.

[0067] The focus lens position 501 is a position on the optical axis O of the focus lens 103. The shooting distance is detected by the lens position sensor 304. The position of the focus lens 103 corresponding to the shooting distance is the distance from the object to the image plane. This means that the image of a subject at a predetermined shooting distance is focused on the light receiving surface (imaging surface) of the image sensor 320. This is the position of the focus lens 103. The first conversion table 500 in FIG. The range of possible shooting distances is stored in the lens side memory 302 shown in FIG. This is a value that is predetermined by the cylinder.

[0068] As described above, in this embodiment, 1 / shooting distance 502 is the distance between the focus ring 104 and the object. The amount of movement of the image plane of the subject image is linear with respect to the amount of rotation of the focus ring 104. Alternatively, the shooting distance may be linearly proportional to the amount of rotation of the focus ring 104. The amount of movement of the focus lens 103 may be the same as that of the focus ring 104. It may be linear with respect to the amount of rotation.

[0069] <User-defined settings to limit shooting distance> Next, the user can further limit the range of shooting distances of the lens barrel 101. Specifically, the case where the user operates the lens side operation device 311 or the body The camera-side operation device 327 is used to input or select the shooting distance values ​​D1 and D2. , the shooting distance range is limited to D1 to D2, which is narrower than the original shooting distance range. In addition, the lens barrel 101 has a number of shooting distance ranges preset. The user may then select the desired limit range.

[0070] <Driving the focus lens 103> Next, an operation when the range of the photographing distance is limited will be described. In the optical device 100, the focus lens 10 when the range of the shooting distance is limited 3 is a flowchart showing an example of a driving process procedure of the third embodiment; The shooting distance range limit has already been set by the user, and the set value is stored in the lens memory. The information is stored in the library 302.

[0071] The rotation stroke is Δθset, and the maximum value within the limited range of the shooting distance set by the user is Set the near side shooting distance to Rset 至近側 , the telephoto shooting distance is Rset 無限遠側 (shooting distance The reciprocal of the closest shooting distance within the limit range of distance is 1 / Rset 至近側 , the shooting distance on the infinity side The reciprocal of the distance is 1 / Rset 無限遠側 In this embodiment, the lens side control unit 300 The driving process of the focus lens 103 is performed in the optical device 100. In the case of an optical device 100 in which the camera body 1 and the image pickup device 102 are integrated, the body side control unit 323 A process for driving the focus lens 103 may be executed.

[0072] The optical device 100 determines whether or not the MF (Manual Focus) mode is ON. For example, the lens side operation device 311 of the lens barrel 101 is a slide switch that can be used to switch between MF mode and AF (autofocus) mode. If the slide switch is set to AF mode (MF mode: OFF), Step S601: No. If the MF mode is set (MF mode: ON), Step S601:Yes.

[0073] If step S601: Yes, the optical device 100 performs pre-operation position detection processing (step S602), operation sensitivity calculation process (step S603), 1 / RA limit process (step S 604), and a manipulated variable calculation process (step S605).

[0074] The pre-operation position detection process (step S602) is performed before the focus ring 104 is operated. This is a process to detect the position on a circumference centered on the optical axis of the optical system, and will be described later in Figure 7. In the sensitivity calculation process (step S603), the sensitivity of the operation of the focus ring 104 is calculated. This is a calculation process, which will be described later with reference to FIG.

[0075] In the 1 / RA limiting process (step S604), the shooting distance is set within the shooting distance set by the user. This is a process for limiting the amount of operation to the maximum value, which will be described later with reference to FIG. This is a process for calculating the rotation angle (operation amount Δθ) of the focus ring 104. The target position determination process (step S606) is performed by determining the target position of the focus lens 10. This is a process for determining the position of 3, which will be described later with reference to FIG.

[0076] After the target position determination process (step S606), it is determined whether the operation is completed (step In step S607, the determination as to whether the operation has been completed can be made, for example, It is judged whether the state where the amount of work Δθ does not change with the elapsed time continues for a predetermined time or more. Alternatively, the state in which the amount of change in the manipulated variable Δθ per unit time is equal to or less than a predetermined value may be determined as a predetermined value. It may be determined whether the state continues for a certain period of time or more.

[0077] If the operation is completed in step S607 (step S607: Yes), the optical device 10 0 returns to the pre-operation position detection process (step S602), and if the operation has not ended ( In step S607: No, the optical device 100 checks whether the MF mode has been switched to OFF. It is determined whether or not the

[0078] If the MF mode is not switched to OFF (step S608: No), the optical device The process goes to step S609 to determine whether the user setting conditions have been changed. The change in the above-mentioned aspect is, for example, the insertion of a built-in converter in the lens barrel 101 described later. 1 / The shooting distance range can be changed by changing the range or by loading the rotation stroke registered in advance. be.

[0079] If the user setting conditions have been changed (step S609: Yes), the operation sensitivity calculation process (Return to step S603). Then, the optical device 100 performs the following under the changed user setting conditions: The operation sensitivity calculation process (step S603) and subsequent processes are executed again.

[0080] If the user setting conditions have not been changed (step S609: No), the operation amount calculation process Then, the optical device 100 performs the operation amount calculation process (step S In step S608, the MF mode is turned OFF. If the focus lens 1 has been replaced (step S608: Yes), the optical device 100 The drive process of 03 is completed.

[0081] <Pre-operation position detection process (step S602)> FIG. 7 is a detailed process of the pre-operation position detection process (step S602) according to the first embodiment. 1 is a flowchart showing an example of a procedure. The optical device 100 detects whether a first elapsed time t1 is equal to or shorter than a first predetermined time. The process continues to wait until the first predetermined time Tth1 or more (step S701: No). is the update time interval for updating the current position θB of the focus ring 104. One elapsed time t1 is the time when the current position θB is updated (the update time interval of the first predetermined time Tth1). The time elapsed since the expiration of the

[0082] If the first elapsed time t1 is equal to or longer than the first predetermined time Tth1 (step S701: Yes ), the optical device 100 detects the current position of the focus ring 104 from the output of the rotation angle sensor 309. Then, the optical device 100 updates the position θB of the first elapsed time (step S702). t1 is initialized (t1=0) (step S703). Next, the optical device 100 executes the following The rotational operation amount |Δθ| is calculated by equation (2) (step S704).

[0083] |Δθ|=|θB−θA| (2)

[0084] θA is the position (initial rotation angle) of the focus ring 104 before θB is updated. Then, the optical device 100 judges whether the rotation operation amount |Δθ| is larger than the judgment threshold value θth. The determination threshold value θth is set to a value that is indicative of whether the user has intentionally changed the focus (step S705). This is a threshold value for determining whether the sling 104 has been operated.

[0085] When the rotation operation amount |Δθ| is equal to or smaller than the determination threshold value θth (step S705: No) In this case, it is determined that the user has not intentionally operated the focus ring 104. The optical device judges whether the second elapsed time t2 is equal to or longer than the second predetermined time Tth2 (step The second elapsed time t2 is the time during which the state where the threshold value θth is equal to or less than the threshold value θth continues. The second predetermined time Tth2 is a time for updating the initial rotation angle θA of the focus ring 104. This is the update time interval for

[0086] If the second elapsed time t2 is equal to or longer than the second predetermined time Tth2 (step S706: Yes ), the optical device 100 initializes the second elapsed time t2 (t2=0) and sets the initial rotation angle θA The rotation angle is updated to the current rotation angle θB (step S707), and the process returns to step S701. If the time t2 is not equal to or longer than the second predetermined time Tth2 (step S706: No), The process returns to step S701 without executing step S707.

[0087] This allows the operation rotation amount |Δθ| to be equal to or smaller than the judgment threshold value θth (step If the focus ring 104 is not operated for a second predetermined time Tth2 or more, If the process continues (step S706: Yes), the initial rotation angle θA is updated. The calculation accuracy of the rotational operation amount |Δθ| can be improved.

[0088] In step S705, the rotation operation amount |Δθ| is greater than the determination threshold value θth. If the detection result is large (step S705: Yes), the optical device 100 performs pre-operation rotation angle detection processing ( Then, the process proceeds to the sensitivity calculation process (step S603).

[0089] <Operation Sensitivity Calculation Process (Step S603)> Next, the process of calculating the sensitivity described above will be described. 0 calculates the operation sensitivity Kset as the sensitivity. The operation sensitivity Kset is the focus This is the reciprocal of the change in the shooting distance when the ring 104 is rotated by a predetermined angle. Based on the sensitivity Kset, the focus ring 104 is rotated by a distance corresponding to the angle. The cas lens 103 is driven.

[0090] FIG. 8 is a detailed process of the operation sensitivity calculation process (step S603) according to the first embodiment. FIG. 9 is a flowchart showing an example of the operation sensitivity calculation process (step S603). The optical device 100 is a diagram showing parameters used in the optical system. Information about the shadowable range (1 / Rlimit 至近側 , 1 / Rlimit 無限遠側 ) to The Rlimit is read from the lens-side memory 302 (step S801). 無限遠側 , Rli mit 至近側 are the upper and lower limits of the photographable distance.

[0091] In addition, the optical device 100 is configured to detect the user-set value (1 / Rset 至近側 , 1 / Rset 無限遠側 , Δθset) is read from the lens side memory 302 (step S802). 至近側 and Rset 無限遠側 is the shortest shooting distance range set by the user. Δθset is the rotation stroke of the focus ring 104. It is a work.

[0092] Rset 無限遠側、 Rset 至近側 The default values ​​of Rlimit 無限遠 側 , Rlimit 至近側 The user has set a limit on the shooting distance. If not, 1 / Rset至近側 , 1 / Rset 無限遠側 You can omit obtaining stomach.

[0093] Note that the range of the lens information acquired in step S801 may vary depending on the settings of the imaging device 102. The range of lens information acquired in step S801 may be changed depending on the step If the range is narrower than the range of the user setting value acquired in S802, The range of the restriction set is restricted to the range of the lens information acquired in step S801.

[0094] Specifically, the user can insert a converter into an optical system that has a built-in converter. If the minimum shooting distance of the optical system becomes shorter than the minimum shooting distance limited by the camera settings, In this case, the user-specified shooting distance value is replaced with the minimum shooting distance after the converter is inserted. This process is performed based on the timing of converter insertion / removal, that is, the drive process of the focus lens 103. This may be done before the start of

[0095] First, the optical device 100 calculates the shooting distance stroke ratio K Δ(1 / R) Calculate (Step S803). Δ(1 / R) The lens barrel 101 Regarding the range of shooting distances set by the user (setting range) with respect to the range of shooting distances that can be shot The ratio of each range is expressed using the reciprocal of the shooting distance, and is 0.0 <K Δ(1 / R ) ≦1.0. If the user does not set a limit for the shooting distance, K Δ(1 / R ) =1.0.

[0096] K Δ(1 / R)=Δ(1 / Rset) / Δ(1 / Rlimit)···(3) however, Δ(1 / Rset)=1 / Rset 至近側 -1 / Rset 無限遠側 Δ(1 / Rlimit)=1 / Rlimit 至近側 -1 / Rlimit 無限遠側 Incidentally, Δ(1 / Rset) is called the shooting distance stroke.

[0097] After that, the optical device 100 calculates the operation sensitivity Kset by the following formula (4): Step S804), and then the process proceeds to the manipulated variable calculation process (step S604).

[0098] Kset=Δ(1 / Rset) / (Δθset)···(4)

[0099] The operation sensitivity Kset is represented by the slope of the straight line 901 in the graph 900 of FIG. This is the reciprocal of the change in the shooting distance when the focus ring 104 is rotated by a certain angle. Therefore, the larger the operation sensitivity Kset is, the more sensitive the focus ring 104 will be (the more sensitive the focus distance will be). The smaller the operation sensitivity Kset, the larger the inverse of the distance between the focus ring and the focus ring. reacts insensitively (changes in the inverse of the shooting distance are small).

[0100] <1 / RA Restriction Processing (Step S604)> FIG. 10 is a detailed processing procedure of the 1 / RA restriction process (step S604) according to the first embodiment. RA is the current shooting distance, and 1 / RA limiting processing is performed. This is a process for limiting the shooting distance to a set shooting distance range. 0 indicates the current focus lens position 501 according to the output from the lens position sensor 304. Obtain (step S1001).

[0101] The current focus lens position 501 is defined as a focus lens position FLA. 100 is a 1 / flash conversion table corresponding to the focus lens position FLA from the first conversion table 500. The value of the shadow distance 502 is obtained (step S1002). The obtained 1 / shooting distance 502 is expressed as follows: Let it be 1 / RA.

[0102] Next, the optical device 100 has a ratio of 1 / RA to 1 / Rset 至近側 Determine if greater than (Step S1003). 1 / RA is 1 / Rset 至近側 If it is greater than (step P1003: Yes), the current shooting distance RA is Rset 至近側 means shorter than Therefore, the optical device 100 adjusts the focal length by 1 / RA to fall within the set shooting distance. Rset 至近側 (step S1004), and the operation amount calculation process (step S605 ) to

[0103] On the other hand, 1 / RA is 1 / Rset 至近側 If the following is true (step S1003: No): The optical device 100 has a ratio of 1 / RA to 1 / Rset 無限遠側 Determine whether it is smaller than Step S1005).

[0104] 1 / RA is 1 / Rset 無限遠側 If it is smaller than (step S1005: Yes), The current shooting distance RA is Rset 無限遠側 This means that the optical The camera 100 is set to 1 / Rset so that 1 / RA falls within the set shooting distance. 無限遠側 Updated to Then (step S1006), the process proceeds to the operation amount calculation process (step S605).

[0105] On the other hand, 1 / RA is 1 / Rset 無限遠側 If the number is equal to or greater than the number (step S1005: No), , the current shooting distance RA is Rset 至近側 Above and Rset 無限遠側 Because Therefore, step S1006 is not executed and the process proceeds to the operation amount calculation process (step S605). By the 1 / RA limiting process (step S603), the current shooting distance RA is Rset 至近 側 Above and Rset 無限遠側 It is limited to the following:

[0106] <Operation amount calculation process (step S605)> FIG. 11 is a detailed process of the operation amount calculation process (step S605) according to the first embodiment. 1 is a flowchart showing an example of the operation amount calculation process (step S605). This is a process for calculating the rotation angle (operation amount Δθ) of the ring 104. Then, it is determined whether the first elapsed time t1 is equal to or greater than the first predetermined time Tth1 (step S1 101: No). If the first elapsed time t1 is equal to or longer than the first predetermined time Tth1 (step S 1101: Yes), the optical device 100 determines the focus position from the output of the rotation angle sensor 309. Then, the current position θ B of the ring 104 is updated (step S1102).

[0107] Next, the optical device 100 calculates the rotational speed of the focus ring 10 according to the following equations (5) and (6). 4 Operation position limit range [θlimit 至近側 ,θlimit 無限遠側 Calculate (step The operation position limit range is determined by the operation of the focus ring 104. This is the range of positions of the focus ring 104 within which the focus lens 103 is driven.

[0108] θ limit 至近側 =θA+(1 / Rset 至近側 -1 / RA) / Kset···(5 ) θ limit 無限遠側 =θA+(1 / Rset 無限遠側 -1 / RA) / Kset... (6)

[0109] Operation position limit range [θlimit 至近側 ,θlimit 無限遠側 ] specifies the shooting distance range. The range of movement of the focus ring 104 corresponding to the limited movement range of the focus lens 103 If you limit the shooting distance range, the set rotation stroke is the same as the limited shooting distance range. Corresponds to a distance range.

[0110] Specifically, for example, θlimit 至近側 is the shooting distance Rset 至近側 When The position of the focus ring 104 corresponds to the position of the focus lens 103 in the range of movement. θlimit 無限遠側 is the shooting distance Rset 無限遠側 When The position of the focus ring 104 corresponding to the position of the focus lens 103 is within the range of movement. corresponds to the end.

[0111] Operation position limit range [θlimit 至近側 ,θlimit 無限遠側 ] is a focus ring Since the focus ring 104 is within the range of its operable positions, the focus ring 104 is Range [θ limit 至近側 ,θlimit 無限遠側 Even if you rotate it beyond ], the focus lens The lens 103 is a limit range for the operation position [θlimit 至近側 ,θlimit 無限遠側 ] The focus lens 103 does not move beyond its movement range.

[0112] Then, the optical instrument 100 detects that the updated current position θB is θlimit 至近側 Bigger It is determined whether the updated current position θB is equal to or smaller than θlimit (step S1104). 至近側 If it is greater than the updated value (step S1104: Yes), the optical device 100 The current position θB is θlimit 至近側 (step S1105), and then step S1 That is, the lens barrel 101 or the imaging device 102 moves to 108. The current position of ring 104 is θlimit 至近側 We recognize that this is the case.

[0113] On the other hand, the current position θB is θlimit 至近側 If the following condition is met (step S1104: N o), the current position θB is θlimit 無限遠側 Determine whether it is smaller than (step S 1106). The current position θB is θlimit 無限遠側 If it is smaller (step S110 6: Yes), the optical device 100 sets the current position θB to θlimit 無限遠側 Update to ( Step S1107) and then step S1108. Alternatively, the imaging device 102 determines that the current position of the focus ring 104 is θlimit 無限遠側 Yes It is recognized that.

[0114] On the other hand, the current position θB is θlimit 無限遠側 If the above is true (step S1106: If no, step S1107 is not executed and the process proceeds to step S1108. , the current position θB is within the operation amount limit range [θlimit 無限遠側,θlimit 至近側 ] inside is set to.

[0115] In step S1108, the optical device 100 initializes a first elapsed time t1 (t1=0). Then, the optical device 100 calculates the focal length by the following formula (7): The operation amount Δθ of the cast ring 104 is calculated (step S1109), and the target position determination process ( Proceed to step S606).

[0116] Δθ = θB - θA (7)

[0117] <Target position determination process (step S609)> FIG. 12 is a detailed process of the target position determination process (step S606) according to the first embodiment. 6 is a flowchart showing an example of the target position determination process (step S606). The position of the focus lens 103 corresponding to the operation amount Δθ by which the sling 104 is operated is determined. The optical device 100 calculates 1 / RB by the following formula (8) (step (Step S1201). RB is the target shooting distance.

[0118] 1 / RB=1 / RA+Kset×Δθ (8)

[0119] The optical device 100 refers to the first conversion table 500 and converts 1 / shooting distance 502 into 1 / R A target focus lens position FLB is determined as the focus lens position 501 at B. (Step S1202). Then, the optical device 100 moves to the target focus lens position FLB to the motor drive control unit 308 (step S1203), and step S607 in FIG. The target focus lens position FLB is output to the motor drive control unit 308. As a result, the optical device 100 moves the focus lens 103 to the target focus lens position FLB Move it to.

[0120] FIG. 13 is a diagram illustrating a driving process of the focus lens 103 according to the first embodiment. 13, the above-mentioned pre-operation position detection process (step S602), the operation amount calculation process (step S603), 1 / RA limiting process (step S604), operation amount calculation process (step S60 5) and the parameters in the target position determination process (step S606).

[0121] To repeat, in FIG. 13, the operation sensitivity calculation process (step S603) The calculated Kset indicates the slope of a straight line 1301 in a graph 1300 in FIG. The operation amount Δθ calculated in the process (step S605) corresponds to the focus lens position before the operation. Using the reciprocal 1 / RA of the shooting distance RA, the position corresponding to the operation is calculated by using the above formula (8). The reciprocal of the shooting distance RB when the focus lens 103 is moved, 1 / RB, is calculated. The reciprocal of the shadow distance, 1 / RB, is converted into the focus lens position FLB using the first conversion table 500. Convert to.

[0122] In this way, the optical device 100 according to the first embodiment can capture images within the shooting distance range set by the user. The movement of the focus lens 103 corresponding to the focus can be controlled with a rotation stroke set by the user. Therefore, it is possible to focus the image of a second object from a state in which the image of a first object is focused. The user can decide the amount of focus ring movement when You can set it so that you can rotate the ring in one operation. You can also move the focus. This makes it easy to adjust the speed of the shutter. These are particularly useful functions when shooting video. .

[0123] [Embodiment 2] In this embodiment, when the optical system of the lens barrel 101 is an optical system whose focal length is changeable, In the second embodiment, the optical system of the lens barrel 101 includes a plurality of lenses. When the focal length is changed by moving one of the lenses (zoom lens), The position of the zoom lens corresponds to the focal length.

[0124] The range of shooting distance may vary depending on the zoom lens position. The minimum shooting distance at the wide-angle end is shorter than the minimum shooting distance at the telephoto end. In some cases, the wide-angle end can capture a closer subject. In this case, the shooting distance at the wide-angle end is The range is wider than that at the telephoto end.

[0125] The optical device 100 and the lens barrel 101 of this embodiment are used in such a zoom lens. However, once the user sets the rotation stroke, the It allows focus adjustment from the closest shooting distance to infinity with the same rotation stroke. In the first embodiment, the user can set the limit of the shooting range. In this embodiment, the case where the user does not set any restrictions on the shooting range will be described. The shooting range may be restricted. The second embodiment differs from the first embodiment in the following points: The same content as in the first embodiment will be explained below, and the explanation will be omitted.

[0126] <Hardware configuration example of the optical device 100> FIG. 14 is a block diagram showing an example of a hardware configuration of the optical device 100 according to the second embodiment. In addition to the components described in FIG. 1, the lens barrel 101 includes a zoom lens 1401 and , a zoom lens holding portion 1402, a cam barrel 1403, and a second lens position sensor 1404. The zoom ring 1405 and the second touch sensor 1406 are generally Zoom lenses change the focal length by changing the spacing between the multiple lens groups that make up the lens. In the second embodiment, the focal length is changed by changing the direction of the optical axis of the zoom lens 1401. The above may be changed.

[0127] The zoom lens 1401 is a lens that can change the focal length of the optical system of the lens barrel 101. The zoom lens 1401 has the same optical axis O as the focus lens 103. The zoom lens holder 1402 is movable in the direction of the optical axis O. The cam barrel 1403 is a zoom lens holder 1402 that holds the zoom lens and can move in the direction of the optical axis O. The zoom lens 1401 moves in the direction of the optical axis O. The zoom lens holding portion 1402 is guided along the cam groove.

[0128] A second lens position sensor 1404 (hereinafter, the lens position sensor 304 is referred to as the first lens position sensor The position sensor 304 detects the position of the zoom lens 1401 in the optical axis O direction and outputs a detection signal. The second lens position sensor 1404 outputs the signal to the lens side control unit 300. The zoom ring 1405 is attached to the circumferential surface of the lens barrel 101 with the optical axis O at the center. The operating member is an annular member that is rotatable about its axis.

[0129] By rotating the zoom ring 1405 around the optical axis O, the zoom ring 1405 The second touch sensor 1406 (hereinafter, the touch sensor 310) moves in the direction of the optical axis O. The sensor 310 is an annular sensor on the circumferential surface of the lens barrel 101, the sensor 310 being centered on the optical axis O. The touch position of the user's finger on the touch surface corresponds to the position of the zoom ring 1405. The second touch sensor 1406 corresponds to the start and end points of the rotation stroke. The contact position of the second touch sensor 1406 is detected and a detection signal is output to the lens side control unit 300. To exert effort.

[0130] <Second conversion table> FIG. 15 is an explanatory diagram showing an example of the contents of the second conversion table. 00 is the value of the zoom lens position 1501, ZLα (1≦α≦m: m is a constant. For each lens position ZLα, 1 / Rβ (1≦β≦ 1 is a table showing focus lens positions FLA corresponding to n:n is a constant. In 2, the shooting distance varies depending on the zoom lens position ZLα (1≦α≦m). .

[0131] At the zoom lens position ZL1, 1 / shooting distance 502 is in the range from 1 / R1 to 1 / Rn. indicates that shooting is possible, and the focus lens position FLA corresponding to that range is set. At the zoom lens position ZLm, 1 / shooting distance 502 changes from 1 / R to 1 / Rn- 2, and the focus lens position is in the range of 1 / R to 1 / Rn-2. The location FLA is set.

[0132] At each zoom lens position ZLα, a focus lens position FLαβ is set. Set the closest shooting distance to Rlimit 至近側_ZLA , the infinity side is Rlimit無限遠 側_ZLA By using the second conversion table 1500, the focus lens position Based on the position FLαβ and the value ZLα of the zoom lens position 1501, 1 / shooting distance Rβ is determined. In addition, the zoom lens position 15 is determined by using the second conversion table 1500. Based on the value ZLα of 1 / flash distance 501 and the value Rβ of 1 / flash distance 502, the focus lens position FL αβ is determined.

[0133] <Example of driving process procedure for focus lens 103> FIG. 16 is a diagram showing a driving process of the focus lens 103 in the optical device 100 according to the second embodiment. 1 is a flowchart showing an example of a processing procedure. 8 is the same as in FIG. 6, so the explanation will be omitted.

[0134] If the MF mode is not switched to OFF (step S608 : No), and check whether there are any changes to the user setting conditions and zoom lens position ZLα (step The change in the zoom lens position ZLα is achieved, for example, by a second lens position sensor The zoom lens position ZLα is detected by a predetermined If the position change is within the allowable range, it will not be considered a change in the zoom lens position ZLα. Good too.

[0135] When both the user setting condition and the zoom lens position ZLα are changed (step S1 609: Yes), and return to step S1603.

[0136] Then, the optical device 100 performs the operation sensitivity calculation process at the changed zoom lens position ZLα. (step S1603), 1 / RA limiting process (step S1604), operation amount calculation process ( Step S605) and the target position determination process (step S606) are executed again. Details of the sensitivity calculation process (step S1603) are shown in FIG. 17. Details of step S1604) will be described later with reference to FIG.

[0137] If neither the user setting condition nor the zoom lens position ZLα has been changed (step Then, the optical device 100 performs the operation amount calculation. The target position determination process (step S606) and the target position determination process (step S605) are then executed again. In step S608, if the MF mode is switched to OFF (step S6 08: Yes), optical device 100 ends the process of driving focus lens 103.

[0138] <Operation Sensitivity Calculation Process (Step S1603)> FIG. 17 is a detailed process of the operation sensitivity calculation process (step S1603) according to the second embodiment. FIG. 18 is a flowchart showing an example of a processing procedure. FIG. 1 is a diagram showing parameters used in

[0139] The optical device 100 determines the current zoom lens position based on the output from the second lens position sensor 1404. The lens position ZLA is obtained (step S1701). Then, the process proceeds to step S1702. Next, the optical device 100 calculates the available shooting distance corresponding to the current zoom lens position ZLA. Distance range (1 / Rlimit 至近側_ZLA、 1 / Rlimit 無限遠側_ZLA )of, The value is obtained from the second conversion table 1500 (step S1702).

[0140] In addition, the optical device 100 reads the rotation stroke Δθset from the lens side memory 302. Δθset is the driving process of the focus lens 103f. This is the rotation stroke of the focus ring 104 that is preset before starting.

[0141] Thereafter, the optical device 100 is determined to be at the zoom lens position ZLA according to the following equation (9). Sensitivity of operation Kset_ ZLA (step S1704), and 1 / RA limiting process ( Proceed to step S1604).

[0142] Kset_ ZLA =Δ(1 / Rlimit_ ZLA ) / (Δθset) (9)

[0143] The operation sensitivity Kset is represented by the slope of a straight line 1801 in a graph 1800 in FIG. If the range of the shooting distance changes depending on the zoom lens position ZLα, then, according to equation (9), Kset_ ZLA The value of also changes depending on the zoom lens position ZLα.

[0144] <1 / RA restriction process (step S1604)> FIG. 19 is a detailed process of the 1 / RA restriction process (step S1604) according to the third embodiment. 1 is a flowchart showing an example of the procedure. The optical device 100 receives the following from the first lens position sensor 304: The current focus lens position FLA is obtained from the output of the second lens position sensor 14. The current zoom lens position ZLA is obtained from the output from the zoom lens control unit 104 (step S1901 ).

[0145] The optical device 100 receives the focus lens position FLA and the focus lens position FLA from the second conversion table 1500. and obtain the value of 1 / shooting distance 502 corresponding to the zoom lens position ZLA (step S1 902). The acquired 1 / shooting distance 502 is set to 1 / RA. RA is the current shooting distance. be.

[0146] Next, the optical device 100 has a 1 / RA of 1 / Rlimit 至近側_ZLA Greater than It is determined whether 1 / RA is equal to or smaller than 1 / Rlimit (step S1903). 至近側_ZLA If the current shooting distance RA is greater than Rset (step S1903: Yes), 至近 側 Therefore, the optical instrument 100 converts 1 / RA into 1 / Rlim. it 至近側_ZLA (step S1904), and the operation amount calculation process (step S6 05).

[0147] On the other hand, 1 / RA is 1 / Rlimit 至近側_ZLA If the following condition is met (step S190 3: No), the optical device 100 has a 1 / RA of 1 / Rlimit 無限遠側_ZLA Less than It is determined whether the number of the pieces of information is small (step S1905).

[0148] 1 / RA is 1 / Rlimit 無限遠側_ZLA If it is smaller than (step S1905 : Yes), the current shooting distance RA is Rlimit 無限遠側_ZLA means longer than Therefore, the optical device 100 sets 1 / RA to 1 / Rlimit 無限遠側_ZLA To The update is performed (step S1906), and the process proceeds to the operation amount calculation process (step S605).

[0149] On the other hand, 1 / RA is 1 / Rlimit 無限遠側_ZLA If it is equal to or greater than this (step S80 5:No), the current shooting distance RA is Rlimit 至近側_ZLA That's it, and Rli mit 無限遠側_ZLA Since the value is less than or equal to the value in step S1906, the operation amount calculation is performed without executing step S1906. The process proceeds to step S605. The current shooting distance RA is Rlimit 至近側_ZLA Above and Rlimit 無限 遠側_ZL It is limited to the following:

[0150] FIG. 20 is a diagram relating to the driving process of the focus lens 103 according to the second embodiment. FIG. 20 shows the above-mentioned pre-operation position detection process (step S602), operation sensitivity calculation process (step S603), and the like. Step S1603), 1 / RA limiting process (Step S1604), operation amount calculation process (Step 6 shows parameters in the target position determination process (step S605) and the target position determination process (step S606).

[0151] To repeat, in FIG. 20, the operation sensitivity calculation process (step S1603) The calculated Kset is shown by the slope of the straight line 2001 in the graph 2000 in FIG. The operation amount Δθ calculated in the process (step S605) and the focus lens position before the operation Using the reciprocal 1 / RA of the corresponding shooting distance RA, the position corresponding to the operation is calculated by using the above formula (8). Then, the reciprocal 1 / RB of the shooting distance RB when the focus lens 103 is moved to the target position is calculated. The reciprocal of the shooting distance, 1 / RB, is converted to the focus lens position FLB using the first conversion table. Exchange.

[0152] In this way, the optical device 100 according to the second embodiment can adjust the rotation stroke set by the user. The sensitivity of the focus ring 104 is changed for each zoom lens position ZLα according to the range of In addition, when the zoom lens 1401 moves, the optical device 100 performs the sensitivity calculation process ( Step S1603) and re-execute the target position determination process (step S606). do.

[0153] As a result, the optical device 100 can adjust the range of photographable distances according to the zoom lens position ZLα. Even if the zoom lens position ZLα changes, the focus will be the same across the entire range of shooting distances. The movement of the lens 103 can be controlled by a set rotation stroke. When the user sets the rotation stroke to 90 degrees, the zoom lens position ZLα is The amount of focus required to move from an object at infinity to the closest object (minimum shooting distance) is The focus ring movement amount is standardized to 90 degrees.

[0154] The optical device 100 having the zoom lens 1401 of the second embodiment is similar to the first embodiment. In the second embodiment, the range of the photographable distance may be set by the user. When the range of the photographable distance is set by the zoom lens position ZLα, It is advisable to carry out processing in the above.

[0155] [Embodiment 3] In the third embodiment, the moving range of the focus lens 103 in the first and second embodiments is set by the user. The same components as those shown in the first and second embodiments are denoted by the same reference numerals. , the explanation of which will be omitted.

[0156] FIG. 21 is an explanatory diagram showing an example of user setting of the movement range of the focus lens 103. 21, the display screen 400 of the rear monitor 331 displays the lenses constituting the optical device 100. An image corresponding to a cross section of the lens barrel 101 (hereinafter simply referred to as the lens barrel 2001), and An image corresponding to the imaging device 102 (hereinafter, simply referred to as the imaging device 2102) and a confirmation button In the lens barrel 2101, a lens that can move in the direction of the optical axis O is displayed. The image object of the focus lens 103 (hereinafter, the focus lenses 2103a and 21 03b.) is displayed.

[0157] FIG. 21A shows a display screen 400 before the setting of the movement range of the focus lens 103 is changed. In FIG. 21A, the focus lens 2103a is the same as the focus lens 103. The focus lens 2103b is located at the infinite end position E1 of its moving range. The focus lens 2103a is located at the closest end position E2 of the moving range of the focus lens 2103a. , 2103b can be moved in the direction of the optical axis O by the user's finger 410. , E2 is the distance d.

[0158] FIG. 21B shows a state in which the user changes the state of FIG. 21A to a forked state by operating the finger 410 of the user. The lens 2103a is moved in the direction of the optical axis O (in the direction of the thick arrow) toward the image pickup device 2102. The position of the focus lens 2103a after the movement is designated as M1, and the movement distance is designated as Let's call it da.

[0159] When the confirm button 2104 is pressed with a finger 410, the position of the infinity end after the movement becomes E Since the number of lenses has been changed from M1 to M2, the optical device 100 is Rlimit 無限遠側 The value of is changed to a value that is shorter by the travel distance da. The interval [M1, E2] is determined as the movement range of the focus lens 103.

[0160] FIG. 21C shows a state in which the user changes the state of FIG. 21A to a forked state by the operation of the user's finger 410. The lens 2103b is moved in the direction of the optical axis O (thick arrow direction) away from the imaging device 2102. The position of the focus lens 2103b after the movement is M2, and the movement distance is Let be db.

[0161] Then, when the confirmation button 2104 is pressed with a finger 410, the position of the closest end after the movement becomes E2 Since the number of files has been changed from M1 to M2, the optical device 100 has Rlimit 至近側 The value of is changed to a value that is longer by the travel distance db. This causes the section [ E1, M2] is determined as the movement range of the focus lens 103.

[0162] FIG. 21D shows a state in which the user's finger 410 is operated to change the state shown in FIG. 21A to that shown in FIG. The focus lenses 2103a and 2103b are adjusted by the operations shown in (B) and (C) of FIG. 410 is moved in the direction of the optical axis O (thick arrow direction). When pressed, the position of the infinity end after movement is changed from E1 to M1, and the Since the position of the near end has been changed from E2 to M2, the optical device 100 stores the lens side memory 302 Rlimit stored in 無限遠側 The value of is changed to a value shorter than the travel distance da, The Rlimit stored in the lens side memory 302 至近側 The value of is calculated by dividing the travel distance by db. This lengthens the range [M1, M2] to the range where the focus lens 103 moves. Determine the range of motion.

[0163] In this way, the section [E1, E2] which is the movement range of the focus lens 103 is set to the desired range. This allows for an improvement in the degree of freedom in focusing operations.

[0164] In the above description, the focus lens is operated using the touch panel of the rear monitor 331. An example in which the section [E1, E2], which is the movement range of the lens 103, is changed to a desired range has been described. However, the focus lens 10 is moved by using the focus ring 104 or the first touch sensor 310. The range of movement of 3, that is, the interval [E1, E2], may be changed to a desired range.

[0165] <Variation 1> The rotation stroke Δθset is set by the focus ring provided on the lens barrel 101. The user may actually rotate the 104 to set the rotation stroke. In this case, the amount by which the user rotates the focus ring 104 is set as the rotation stroke. do.

[0166] Specifically, when the button on the lens side operation device 311 provided on the lens barrel is pressed, The amount by which the focus ring 104 is rotated is set as the rotation stroke Δθset. The amount of rotation of the focus ring when the focus ring is rotated can be set as the rotation stroke Δθset. By doing so, the user can set the amount of operation of the focus ring 104 without changing the grip of the focus ring 104. can be done.

[0167] <Variation 2> In the above embodiment, the operation sensitivity is calculated after the focus ring 104 is operated. However, when the user sets the rotation stroke and shooting range, the operation sensitivity is calculated in advance and the form After the operation of the cast ring 104 is performed, the calculated operation sensitivity may be called and used. In addition, when the optical system has a zoom lens 1401, the position of the zoom lens 1401 is The operation sensitivity is calculated for each position of the zoom lens 1401. You may take it out and use it.

[0168] <Variation 3> In the second embodiment, the shooting distance of the lens barrel 101 is In this case, the optical device 100 adjusts the focus for each position of the zoom lens 1401. The sensitivity of the ring 104 has been changed. However, when the user sets the rotation stroke, The value of the operation sensitivity of the focus ring 104 calculated from the information on the shooting distance range of the entire It may be used as a common value for all zoom lens positions.

[0169] The present invention is not limited to the above contents, and may be implemented by any combination of the above. In addition, other embodiments that are conceivable within the scope of the technical concept of the present invention are also included in the present invention. is included in the range. [Explanation of symbols]

[0170] 100 Optical device, 101 Lens barrel, 102 Imaging device, 103 Focus lens , 104 focus ring, 300 lens side control unit, 301 lens side processor, 302 lens side memory, 304 lens position sensor, 305 focus lens holding portion , 306 first motor, 307 second motor, 308 motor drive unit, 309 rotation angle sensor 310 a first touch sensor, 311 a lens side operation device, 320 an image sensor, 321 imaging chip, 322 signal processing unit, 323 body side control unit, 324 body side Processor, 325 body side memory, 327 body side operation device, 329 eyepiece sensor, 330 eyeball authentication imaging element, 331 rear monitor, 333 memory card, 33 5 bus, 340 communication device, 400 display screen, 402 confirmation button, 500 first variable conversion table, 501 focus lens position, 502 shooting distance, 1401 zoom lens 1402, a zoom lens holding portion, 1403, a cam barrel, 1404, a lens position sensor, 1405 zoom ring, 1406 second touch sensor, 1500 second conversion table

Claims

1. An operation unit that receives an instruction to move the lens by being moved, A setting unit that sets the amount of movement of the operation unit required to move the lens over a first range, A storage unit that stores a plurality of set values based on the amount of movement of the operation unit required to move the lens over the first range set by the setting unit, A set value changing unit that changes the set value based on the shooting mode, An optical device having the above.

2. The optical device according to claim 1, wherein the setting unit sets the amount of movement of the operation unit required to move the lens over a first range by moving the operation unit.

3. The optical device according to claim 1 or 2, wherein the setting unit restricts the amount of movement of the operation unit that can be set by the setting unit based on the F value of the optical system including the lens.

4. The optical device according to any one of claims 1 to 3, wherein the operation unit has an annular shape and receives an instruction to move the lens by being rotated, and the setting unit sets the amount of rotation of the operation unit as the amount of movement of the operation unit required to move the movable range of the lens.

5. The optical device according to any one of claims 1 to 4, having a storage unit that stores the characteristic information of the user and the amount of movement of the operation unit set by the user for each user using the optical device, and the setting unit reads out the amount of movement of the operation unit of the user from the storage unit based on the characteristic information of the user acquired by the optical device and the characteristic information of the user stored in the storage unit.

6. The optical device according to any one of claims 1 to 5, having a detection unit that detects the position of the operation unit, wherein the minimum amount of movement that can be set by the setting unit is a value based on the resolution that can be detected by the detection unit.

7. The optical device according to any one of claims 1 to 6, having a drive unit that moves the lens, wherein the maximum amount of movement that can be set by the setting unit is an amount based on the resolution that can be driven by the drive unit.

8. The optical device according to any one of claims 1 to 7, The setting unit is an optical device that, in addition to moving the operation unit to set the amount of movement, sets the amount of movement based on an input from an input unit provided in an imaging device connected to the optical device.

9. An optical device according to any one of Claims 1 to 8, The setting unit is an optical device that, in addition to moving the operation unit to set the amount of movement, sets the amount of movement based on information received from a communication device capable of communicating with the optical device or an imaging device connected to the optical device.

10. An optical device according to any one of Claims 1 to 9, The lens is a focus lens, the optical device.

11. An optical device according to any one of Claims 1 to 10, The lens is a zoom lens, the optical device.

12. An optical device according to any one of Claims 1 to 11, having a drive unit that moves the lens, An optical device that changes the ratio of the amount of movement of the lens to the amount of movement of the operation unit when instructing the movement of the lens, based on the amount of movement of the operation unit required to move the lens over the movable range of the lens set by the setting unit.

13. An optical device according to Claim 12, An optical device that changes the ratio of the amount of movement of the lens to the amount of movement of the operation unit when instructing the movement of the lens when the movable range of the lens changes.

Images