JP2020071400A - Lens device and image capturing device - Google Patents

Abstract

To provide a lens device which is advantageous in terms of operating range of an optical member.SOLUTION: A lens device (100) is provided, comprising a movable optical member (101) having a movable range, a drive unit (102, 103) for moving the optical member, and a processing unit (104, 106, 108, 109, 120) configured to generate a command for the drive unit. The processing unit modifies a limit value for the command according to a state of the lens device such that the optical member is moved within an operating range inside the movable range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens device and an image pickup device.

  When an optical member (operation target) such as a zoom lens group, a focus lens group, or an iris (aperture stop) in a lens device is operated by an actuator, a movable range (operation) for operation is provided inside an actual movable range of the optical member. Range) is set. Patent Document 1 discloses that when the focus adjustment is performed manually, the operation range of the focus lens group is expanded by an amount necessary for chromatic aberration correction. Further, Patent Document 2 discloses a photographing lens that stores the position of the optical system detected when the operation member is operated as the movement limit position.

JP, 2006-201396, A JP, 2007-256967, A

  The prior art disclosed in the above-mentioned patent documents does not describe restrictions on the operation range (movement limit position) with respect to the movable range of the optical member. For example, when the focus lens group is the operation target, if the operation range end (movement limit position) is excessively distant from the movable range end, there may be a case where focusing cannot be performed due to temperature change. Further, if the end of the operation range is excessively close to the end of the movable range, a member (for example, a cam follower) that moves together with the focus lens group collides with a member (for example, a stopper member provided on the cam) related to the end of the movable range, and a sound is generated. Can be emitted. An object of the present invention is to provide a lens device that is advantageous in terms of the operating range of an optical member, for example.

One aspect of the present invention is a lens device including a movable optical member having a movable range, a drive unit for moving the optical member, and a processing unit that generates a command for the drive unit. ,
The processing unit changes the limit value for the command based on the state of the lens device so that the optical member is moved in the operation range inside the movable range.
It is a lens device characterized by the above.

  According to the present invention, for example, it is possible to provide a lens device which is advantageous in terms of the operation range of the optical member.

FIG. 3 is a diagram showing a configuration example of the lens device according to the first embodiment. Diagram illustrating the relationship between command coordinates, detected coordinates, and infinity coordinates The figure which illustrates the flow of the process which concerns on this embodiment. FIG. 6 is a diagram showing a configuration example of a lens device according to a second embodiment. Diagram illustrating the relationship between command coordinates, detected coordinates, infinity coordinates, and reproducibility (low) Diagram illustrating the relationship between command coordinates, detected coordinates, infinity coordinates, and reproducibility (high) The figure which illustrates the flow of the process which concerns on this embodiment. The figure which shows the structural example of an imaging device

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Throughout all the drawings for explaining the embodiments, as a general rule (unless otherwise noted), the same members and the like are designated by the same reference numerals, and the repeated description thereof will be omitted.

[Embodiment 1]
FIG. 1 is a diagram illustrating a configuration example of the lens device according to the first embodiment. In the figure, reference numeral 100 denotes a lens device, 101 denotes an optical member, and here, a focus lens group for focusing (adjusting an object distance or focusing) of the lens device 100. Further, 102 is a motor for moving the optical member, 103 is a drive circuit for driving the motor 102, and 104 is an operation amount generation for creating an operation amount (drive signal) for the drive circuit. It is a department. The motor 102 and the drive circuit 103 form a drive unit. Reference numeral 105 is an encoder for detecting the position or coordinates of the optical member 101, and 106 is a counter for counting the pulses generated by the encoder. The encoder 105 and the counter 106 form a coordinate detection unit that detects the coordinates of the optical member. Here, the position or coordinates may be the position or coordinates of a specific point of the optical member 101 that changes the optical characteristics of the lens device 100.

  An operation device 200 (operation unit) that generates a signal for operating the optical member 101 is connected to the lens device 100. The processing unit described later communicates with the operation device 200. Here, the operating device 200 is for operating the focus lens group, and is also called a focus demand. A command generation unit 109 generates a command for the optical member 101 based on a signal from the operation device 200. Reference numeral 108 denotes a command limiting unit that limits the command generated by the command generating unit 109, and sets the operation range of the optical member inside the movable range of the optical member by the restriction. Reference numeral 110 is a temperature detection unit that detects the temperature of the lens device as a state detection unit that detects the state of the lens device, and 111 is the attitude (for example, horizontal (plane)) of the lens device that is the state detection unit. Is a posture detection unit that detects the posture of the lens device (the optical axis of the lens device). Reference numeral 120 denotes a ROM, which non-volatilely stores data 120a relating to the reproducibility of the coordinates of the optical member, which corresponds to at least one of the temperature and the posture. In addition, the ROM 120 stores, in a nonvolatile manner, data 120b of coordinates (also referred to as an optical end) relating to an infinite object distance, which corresponds to at least one of the temperature and the attitude. The command limiting unit 108 limits the command based on at least one of the temperature and the attitude and the data 120a and 120b. Accordingly, the command limiting unit 108 sets the operating range of the optical member 101 or the end of the operating range (also referred to as the operating end or the control end) inside the movable range of the optical member 101. The operation amount generation unit 104, the counter 106, the command limiting unit 108, the command generation unit 109, and the ROM 120 form a processing unit, and the processing unit can be formed of a processor such as a CPU.

  Here, FIG. 2 is a diagram illustrating the relationship among the command coordinates, the detected coordinates, and the infinity coordinates. In the figure, the movable range of the optical member (focus lens group) is represented by a line segment from the end on the minimum object distance side (also referred to as the MOD machine end) to the end on the infinity side (also referred to as the ∞ machine end). , Command coordinates, detected coordinates, and infinity coordinates are described. In addition, the figure shows a case where the reproducibility of the detected coordinates is lowered by the influence of at least one of the temperature and the posture. (1) in the figure shows the detected coordinates as the stop coordinates of the optical member and the infinity coordinates (the optical end on the infinity side) when the command (command coordinates) is limited to the limit value by the command limiting unit 108. Shows the relationship. In order for the optical member to move to the infinity coordinate, the detection coordinate must be on the right side of the infinity coordinate. In (1) of the figure, however, the detection coordinate is on the left side of the infinity coordinate. It indicates that the optical member cannot be positioned. In such a case, as shown in (2) of the figure, the limit value in the command limiter 108 is changed to the direction of ∞ machine end. This allows the detection coordinates to be on the right side of the infinity coordinates without changing the characteristics of the control system (also called the servo system) that is composed of the drive unit, coordinate detection unit, and processing unit. The optical member can be positioned at the coordinates. In the present embodiment, by limiting the command based on the reproducibility of the stop coordinates of the optical member, which is stored in the ROM 120 and changes depending on at least one of the temperature and the posture, the end of the operation range ( The operating end or control end) can be set appropriately. That is, in order to move the optical member in the operation range inside the movable range of the optical member (for example, the member moved together with the optical member does not collide with the member related to the end of the movable range) The limit value can be changed. When the limit value is changed, as a result, the operation amount generated by the operation amount generation unit 104 is limited.

  FIG. 3 is a diagram illustrating a flow of processing according to the present embodiment. The processing is executed by the processing unit. When the processing is started by turning on (Power On) the power of the lens apparatus, first, in step S101, the attitude detection unit 111 detects the attitude of the lens apparatus. Subsequently, in step S102, the temperature detection unit 110 detects the temperature of the lens device. In step S104, it is determined whether the command restriction has not been set. If the command limit is not set, the process proceeds to step S107, and if the command limit is not set, the process proceeds to step S105. In step S107, a limit value of command coordinates (also referred to as a command limit value) is acquired based on the detected posture / temperature and the data 120a and 120b stored in the ROM 120. In the subsequent step S108, the command limit value is set. After that, the process is returned to step S101. In step S105, it is determined whether or not at least one of the detected temperature and posture (the state of the lens device) has changed. If there is such a change, the process proceeds to step S106, and if there is no such change, the process proceeds to step S107. In step S106, it is determined whether the change in at least one of the temperature and the posture is equal to or more than a threshold value. If at least one of them is greater than or equal to the threshold, the process proceeds to step S107, and if at least one of them is less than the threshold, the process returns to step S101. Thereafter, by continuing the process according to the process flow of FIG. 3, the limit value (and thus the operating range of the optical member) for the command for the drive unit can be appropriately changed based on the state of the lens device. become. The state is not limited to at least one of the temperature and the posture as described above. The state may be a state related to reproducibility of the stop coordinates of the optical member, for example. The state may be, for example, the load torque of the drive unit, the elapsed time from the maintenance performed on the lens device, or the reproducibility itself. ..

  Up to this point, in the control in which the coordinates (position) of the optical member 101 is set as the target value, an example of changing the command limit value for the driving unit has been described. You may perform control which makes a rate of change (speed) into a target value. Further, although the present embodiment is applied to the end on the infinity side (∞ mechanical end), it can be applied to the end on the minimum object distance side (MOD mechanical end). Further, the present embodiment is not limited to the end when changing the object distance, but also the end when changing the focal length (zooming) (tele end / wide end) and the end when changing the effective aperture (iris adjustment) (close side). Either the edge or the edge on the open side). According to the present embodiment, for example, it is possible to provide a lens device that is advantageous in terms of the operation range of the optical member.

[Embodiment 2]
FIG. 4 is a diagram illustrating a configuration example of the lens device according to the second embodiment. The configuration of the second embodiment differs from that of the first embodiment in the following two points. The first point is the point having the reproducibility and the acquisition unit 107 that acquires the amount related to the overshoot amount (overshoot amount) of the detected coordinate with respect to the command coordinate. The second point is that it has a change instruction section 130 for instructing a change of the end (operation end or control end) of the operation range. It should be noted that the change instructing unit 130 can be in one of an ON state instructing the change and an OFF state not instructing the change by a manual operation or the like. Therefore, the processing unit may include a user interface unit for the manual operation. Due to these differences, the command limiting unit 108 is also connected to the acquisition unit 107 and the change instruction unit 130, and restricts the command based on the information from the acquisition unit 107 and the change instruction unit 130, thereby changing the operation range. Set the edge. The reproducibility described above can also be referred to as the reproducibility of the detected coordinates when the detected coordinates do not exceed the command, and the amount related to the overshoot amount is the detection when the detected coordinates exceed the command. It can also be called the reproducibility of coordinates.

  Here, FIG. 5 is a diagram illustrating the relationship among the command coordinates, the detection coordinates, the infinity coordinates, and the reproducibility (low). In the figure, the movable range of the optical member (focus lens group) is represented by a line segment from the end on the side of the minimum object distance (MOD machine end) to the end on the side of infinity (∞ machine end), where the command coordinates and The detection coordinates and the infinity coordinates are described. In addition, the figure shows a case where the reproducibility of the detected coordinates is lowered by the influence of at least one of the temperature and the posture. (A) of the figure shows the relationship between the detected coordinates as the stop coordinates of the optical member and the infinity coordinates (∞ optical end) when the command coordinates are limited to the limit values by the command limiting unit 108. There is. In order for the optical member to move to the infinity coordinate, the detection coordinate must be on the right side of the infinity coordinate. However, in (a) of the figure, the detection coordinate is on the left side of the infinity coordinate. It indicates that the optical member cannot be positioned. In such a case, the acquisition unit 107 acquires the reproducibility X of the detected coordinates.

Next, (b) of the figure shows a state in which the command coordinates have moved to the MOD machine end side, and as a result, the detected coordinates have moved to the MOD machine end side. (C) of the same figure shows the state when the limit value for the command coordinates is changed from (b) of the same figure. The change is
Limit value = infinity coordinate + reproducibility X + α
It is done by calculating or setting the limit value by the following formula. α is a constant (margin) for giving a margin. (D) of the same figure shows the detected coordinates when the command coordinates are restricted by the new set limit value. Here, the detected coordinate can be located on the right side of the infinite coordinate without changing the characteristics of the control system (servo system) configured by the drive unit, the coordinate detection unit, and the processing unit. That is, the optical member can be positioned at infinity coordinates.

FIG. 6 is a diagram illustrating a relationship among command coordinates, detected coordinates, infinity coordinates, and reproducibility (high). In the figure, the movable range of the optical member (focus lens group) is represented by a line segment from the end on the side of the minimum object distance (MOD machine end) to the end on the side of infinity (∞ machine end), where the command coordinates and The detection coordinates and the infinity coordinates are described. In addition, the figure shows a case where the reproducibility of the detected coordinates is improved by the influence of at least one of the temperature and the posture. FIG. 6E shows the relationship between the detected coordinates as the stop coordinates of the optical member and the infinity coordinates (∞ optical end) when the command coordinates are limited to the limit value. Here, whether the detected coordinate has not reached the ∞ machine end due to overshoot (too much) or causes the acquisition unit 107 to acquire the amount Y related to overshoot. (F) of the figure shows a state in which the command coordinates have moved to the MOD machine end side, and as a result, the detected coordinates have moved to the MOD machine end side. (G) of the same figure has shown the state at the time of changing the limit value with respect to command coordinates from (f) of the same figure. The change is
Limit value = ∞ Machine end coordinate− (Amount Y related to overshoot) * β
It is done by calculating or setting the limit value by the following formula. β is a constant (safety factor or safety factor) for giving a margin. (H) of the figure shows that the detected coordinates can be set to the right of the infinite coordinates without changing the characteristics of the control system (servo system) configured by the drive unit, the coordinate detection unit, and the processing unit. ing. That is, it is shown that the optical member can be positioned at infinity coordinates, and the detected coordinates can be prevented from reaching the ∞ machine end due to overshoot.

FIG. 7 is a diagram illustrating a flow of processing according to the present embodiment. The processing is executed by the processing unit. When the processing is started by turning on (Power On) the power of the lens device, first, in step S201, the posture detection unit 111 detects the posture of the lens device. Subsequently, in step S202, the temperature of the lens device is detected by the temperature detection unit 110. In step S203, the limit value (limit value 1) of the command coordinates is acquired based on the detected posture / temperature and the data 120a and 120b stored in the ROM 120. In the subsequent step S204, the limit value 1 is set. Subsequently, in step S205, a change Flag (change flag) indicating which of the ON and OFF states the change instruction unit 130 is in is set to 0. The change Flag is set to change Flag = 0 when the change instruction unit 130 is in the OFF state, and is set to change flag = 1 when the change instruction unit 130 is in the ON state. Next, in step S214, it is determined whether the command from the operating device 200 is the ∞ control end. If so, the process proceeds to step S215, and if not, the process proceeds to step S206. In step S215, the reproducibility X of the detected coordinates is acquired from the acquisition unit 107. In step S216, the amount Y related to overshoot is acquired from the acquisition unit 107. In step S217, it is determined whether the detected coordinates have not reached the ∞ machine end, that is, the inequality Y <∞ machine end coordinates-limit value is satisfied, based on the amount Y related to overshoot. If the inequality holds,
Limit value 2 = ∞ Optical end coordinate + X + α
Then, the process proceeds to step S220. Here, α is a real constant (> 0) for giving a margin. If the inequality does not hold,
Limit value 2 = ∞ Machine end coordinate-Y * β
Then, the process proceeds to step S220. Here, β is a real constant (> 1) as a safety factor (safety factor).

  In step S220, it is determined whether the change Flag is 1. If the change Flag is 1, the process proceeds to step S221, and if the change Flag is 0 (the change flag = 0 in step S205 for the first time of the determination), the process proceeds to step S222. In step S221, after a predetermined time (scheduled time) has elapsed, the command is changed in the MOD machine end direction. In step S222, it is determined whether or not the command has been changed in the MOD machine end direction after the scheduled time has elapsed. When the change is made, the process proceeds to step S223, and when the change is not made, the process proceeds to step S206. In step S223, the limit value is changed to the limit value 2. In step S224, a process of returning the operation source to the operation device 200 is performed. This process is not a process based on a command from the operation device 200, such as the process of S221 described above or the process of S213 described below, and is necessary when the change Flag = 1 based on the command generated inside the lens apparatus 100. This is a process after performing various processes. If it is determined in step S214 that the command is not the ∞ control end, the process proceeds to step S206 as in the case where the command is not changed in the MOD machine end direction after the scheduled time has elapsed in step S222. ..

  Here, in step S206, the change Flag is set to 0. In step S207, the posture of the lens apparatus 100 is detected by the posture detection unit 111. In step S208, the temperature detection unit 110 detects the temperature inside the lens device. In a succeeding step S209, it is determined whether or not at least one of the posture detected in step S207 and the temperature detected in step S208 has changed. If there is the change, the process proceeds to step S210, and if there is no change, the process proceeds to step S211. In step S210, it is determined whether the change is equal to or more than a threshold value. If the change is greater than or equal to the threshold, the process returns to step S214, and if the change is not greater than or equal to the threshold, the process proceeds to step S211. In step S211, it is determined whether the change instruction by the change instruction unit 130 is ON. If the change instruction is ON, the process proceeds to step S212, and if the change instruction is OFF, the process returns to step S206. In step S212, the change Flag is set to 1. Then, in a succeeding step S213, the instruction is discretely switched to the ∞ machine end. Then, the process is returned to step S214. If it is determined in step S220 that the change flag is 1, the command is changed in the MOD machine end direction after the scheduled time has elapsed in step S221. Therefore, in step S223, the limit value is changed to the limit value 2. Will be done.

  According to the present embodiment, for example, it is possible to provide a lens device that is advantageous in terms of the operation range of the optical member.

[Embodiment of Imaging Device]
FIG. 8 is a diagram illustrating a configuration example of the image pickup apparatus. The imaging device is configured to include the lens device 100 exemplified above and an operation device 200 that generates a signal for operating the optical member (101) in the lens device and transmits the signal to the lens device. .. The image pickup apparatus is configured to include a camera apparatus (image pickup unit) 300 having an image pickup element 300a arranged on the image plane of the lens apparatus 100. According to the image pickup apparatus according to the present embodiment, for example, it is possible to provide an image pickup apparatus that is advantageous in terms of the operation range of the optical member. The operation device 200 may be a part (operation unit) that constitutes a part of the lens device 100. Here, the lens device 100 or the optical member 101 in the lens device 100 and the operating device 200 may configure an optical device. Therefore, the image plane of the lens device 100 or the image plane of the optical member 101 is also referred to as an image plane of the optical device.

  Although the preferred embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist thereof. For example, in the above, the focus lens group for changing the object distance of the lens device has been exemplified as the optical member in the lens device. However, the optical member is not limited thereto, and may be, for example, a zoom lens group for changing the focal length of the lens device, or an aperture stop for changing the F value (F number) or aperture ratio of the lens device. It is profitable. Here, the processing unit or the command generation unit 109 in the lens apparatus 100 changes one of the position of the lens (group) as the state (coordinates) of the optical member and the aperture of the aperture stop as a command. May be generated. In addition, the lens device 100 or the processing unit may include a user interface unit (UI unit) 100a including a display unit. It should be noted that the UI unit 100a may be provided not in the lens device 100 but in the operation device 200 or the camera device 300. When the UI unit is inside the camera device 300, it may be, for example, in a viewfinder of the camera device. Further, the lens device 100 and the operating device 200 are not limited to those having separate housings and forming an optical device. That is, the operating device 200 (operating unit) and the lens device 100 may form an optical device (lens device) with a common housing.

100 lens device 101 optical member 102 motor (constituting drive unit)
103 drive circuit (constitutes drive unit)
104 manipulated variable generation unit (constitutes processing unit)
106 counter (constructs processing unit)
108 Command limiter (constitutes processor)
109 Command generation unit (constitutes processing unit)
120 ROM (constitutes processing unit)

Claims (12)

A lens device having a movable optical member having a movable range, a drive unit for moving the optical member, and a processing unit for generating a command for the drive unit,
The processing unit changes the limit value for the command based on the state of the lens device so that the optical member is moved in the operation range inside the movable range.
A lens device characterized by the above.   The lens device according to claim 1, further comprising a state detection unit that detects the state.   The lens apparatus according to claim 1, wherein the state detection unit detects at least one of a temperature and a posture of the lens apparatus. A coordinate detection unit for detecting the coordinates of the optical member in the movable range,
The processing unit generates an operation amount for the drive unit based on the command and the coordinates.
The lens device according to any one of claims 1 to 3, wherein:   The processing unit obtains information on the reproducibility of the coordinates of the optical member by the drive unit and the processing unit based on the command corresponding to the end of the operation range and the coordinates obtained by the command. The lens device according to claim 4, wherein the limit value is changed based on the information.   The processing unit acquires information about the reproducibility when the coordinates do not exceed the command, and changes the limit value based on the information. Lens device.   7. The processing unit obtains information on the reproducibility when the coordinates exceed the command and changes the limit value based on the information. The described lens device.   8. The processing unit changes the limit value when the instruction is changed from the end to the inside of the operation range, and the limit value is changed. Lens device.   9. The lens apparatus according to claim 8, wherein the processing unit includes a user interface unit for instructing to change the limit value.   The lens according to any one of claims 1 to 9, wherein the optical member is for changing at least one of an object distance, a focal length, and an F value. apparatus.   The lens device, wherein the processing unit communicates with an operation unit that generates a signal for operating the optical member. A lens device according to any one of claims 1 to 11,
An image sensor arranged on the image plane of the lens device;
An imaging device comprising:

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