JP2013050684A - Lens drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device capable of improving convenience of a constant speed control function of a zoom position while having an advantages of a constant speed control functions such as a conventional constant speed auto zoom function or conventional speed preset zoom function.SOLUTION: In a lens drive device, two kinds of constant speed control is performed in accordance with a state of a seesaw switch 20 by which an operator electrically operates a zoom position when the zoom position is moved at a constant speed by pushing a constant speed auto zoom switch 44 served as a constant speed control function. The zoom position is moved in a moving direction at a constant speed when the constant speed auto zoom switch 44 is pushed in a state (does not include 0) that the seesaw switch 20 is operated in an operation amount less than a predetermined one, and the zoom position is moved in the moving direction and at the constant speed of the previous constant speed moving when the constant speed auto zoom switch 44 is pushed without operating the seesaw switch 20.

Description

  The present invention relates to a lens driving device, and more particularly to a lens driving device having a constant speed control function for moving a zoom of a photographing lens used for broadcasting or commercial television cameras at a constant speed (constant speed control).

  In a lens apparatus used in a television camera for broadcasting or business use, a movable lens group incorporated in a photographing lens (photographing optical system), a diaphragm device, or the like is driven by a motor to focus (focus position) of the photographing lens. A device having a lens driving device for electrically performing optical adjustment such as zoom (focal length) is used. When the operator performs optical adjustment of the photographing lens by manual operation using such a lens driving device, when the operator operates the electric manual operation member, the operation of the manual operation member is performed by the lens driving device. According to the operation, the position and speed of focus, zoom, etc. are controlled by the lens driving device.

  For example, a lens device called an ENG lens for a handy camera (ENG camera) that is mainly carried in a news gathering or the like is known as a type of photographing lens used in a television camera. The ENG lens has a lens barrel provided with operation rings such as focus and zoom. The lens barrel has a lens driving device called a drive unit equipped with a motor for electrically rotating each operation ring. It is installed as standard. An electric manual operation member called a seesaw switch (zoom seesaw control switch) is provided in the housing of the drive unit, and the operator operates the seesaw switch to rotate the zoom operation ring with a motor. Thus, the zoom of the taking lens can be moved electrically.

  There is also known a lens apparatus in which a photographing lens is housed in a box-shaped cover called an EFP lens that is mainly used by being fixed to a frame in a studio. The EFP lens incorporates a power transmission mechanism for driving a movable lens group with the power of the motor without using an operation ring such as an ENG lens, and a control circuit for controlling the motor, and via a cable. A controller is connected, and the lens driving device as described above is configured by the power transmission mechanism, the control circuit, and the controller. The controller connected to the ENG lens includes a focus controller, a zoom controller, and the like. When an operator operates an electric manual operation member provided on these controllers, focus, zoom, and the like are performed. It can be moved electrically.

  Among such lens driving devices, those equipped with a zoom control mechanism such as a position preset function and a constant speed control function are conventionally known.

  The position preset function is a function capable of moving the zoom from an arbitrary position to a preset position by a predetermined switch operation by storing a desired zoom position as a preset position. It is disclosed as a position preset function. According to this, after setting the zoom to a position to be stored as a preset position using the manual operation member for zooming, when both the preset zoom switch and the memory switch are pressed (turned on), the zoom position at that time is set to the preset position. Can be stored as When only the preset zoom switch is pressed when desired, the zoom moves from an arbitrary position to a preset position.

  In this specification, a switch (playback switch) corresponding to a preset zoom switch is called a preset on switch (or simply an on switch), and a switch (memory switch) corresponding to a memory switch is a preset memo switch. (Or simply a memo switch).

  On the other hand, the constant speed control function is a function that performs constant speed control to move the zoom at a constant speed (constant speed), specifically, what is called a constant speed auto zoom function (or auto cruising zoom function), What is called a speed preset zoom function is known.

  The constant speed auto zoom function is a function disclosed in, for example, Patent Document 2, and when the zoom is moved at a desired movement direction and movement speed by a manual operation member for zooming (zoom operation member), When a predetermined switch operation is performed, the zoom can be moved at a constant speed with the moving direction and moving speed at that time.

  The speed preset zoom function stores the desired zoom movement direction and movement speed as the preset direction and preset speed, so that the zoom can be moved at a constant speed under the conditions of the preset direction and preset speed by a predetermined switch operation. This function is disclosed in Patent Document 1, for example. According to this, when the memo switch is pressed with the zoom operation member moved in the moving direction and moving speed at which the zoom is stored as the preset direction and the preset speed, the zoom moving direction and moving speed at that time are set in the preset direction. And can be stored as a preset speed. When the preset zoom switch is pressed when desired, the zoom moves at a constant speed under the conditions of the preset direction and the preset speed.

JP 2003-287672 A JP 2000-290068 A

  The constant speed auto zoom function and the speed preset zoom function described above are functions that are effectively used when you want to perform constant speed zoom movement at low speeds, which is difficult mainly with the operation of zoom operation members. It is a similar constant speed control function.

  On the other hand, in the constant-speed auto-zoom function, the operator performs constant-speed control while maintaining the zoom movement direction and movement speed actually set by the zoom operation member. There is an advantage that the moving direction and moving speed of the zoom during the constant speed control can be appropriately adjusted according to the situation. On the other hand, in the speed preset zoom function, constant zoom control is performed according to preset conditions and preset speed conditions stored in advance, so that the operator operates the zoom operation member when starting the constant speed control. Thus, there is an advantage that it is not necessary to move the zoom in the moving direction and moving speed in the constant speed control, and the zoom can be moved at the constant speed under the same conditions as many times as necessary.

  Therefore, if a constant speed control function having both of these advantages can be provided, the convenience of the constant speed control function is improved, which is beneficial to the user. That is, it is beneficial if the conventional constant speed auto zoom function can move the zoom at a constant speed under the same conditions any number of times.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a lens driving device capable of improving the convenience of a constant speed control function of zoom.

  In order to achieve the above object, the lens driving device according to the present invention outputs an operation signal that instructs the zoom moving direction and moving speed or the zoom moving position of the photographing optical system in accordance with the operation of the operator. Operation means, zoom control means for controlling the zoom based on an operation signal output from the electric operation means, an instruction switch that is switched between an on state and an off state, and the zoom control means. Zoom state determining means for determining whether the zoom state is at least a first state that does not include a stopped state, or at least a second state that does not include the first state; and the zoom state When it is determined by the determination means that the state is the first state and the instruction switch is turned on, the current state at the time of detection is determined. The zoom is moved at a constant speed according to the movement direction and movement speed of the zoom, and the second constant speed is controlled by the first constant speed control means for storing the movement direction and the movement speed as a preset direction and a preset speed. A second moving the zoom at a constant speed in a preset direction and a preset speed stored by the first constant speed control means when it is determined that the instruction switch is in an ON state. And constant speed control means.

  According to the present invention, the first constant speed control means can perform the constant speed movement similar to the conventional constant speed auto zoom function. That is, when the operator turns on the instruction switch, the operator can move the zoom at a constant speed in the moving direction and the moving speed in which the operator actually moves the zoom using the electric operating means. On the other hand, the second constant speed control means can perform the constant speed movement similar to the conventional speed preset zoom function. That is, when the zoom is moved at a constant speed by the first constant speed control means, the zoom can be moved in the preset direction and preset speed which are automatically stored, and the first constant speed control means or the second constant speed control is possible. The zoom can be moved at a constant speed under the same conditions as the previous constant-speed movement. Therefore, the lens driving device according to the present invention is a constant speed control function that has the advantages of both the conventional constant speed auto zoom function and the speed preset zoom function. You can choose to run it. In addition, it has an advantage that the zoom can be easily moved at a constant speed under the same conditions as many times as compared with the conventional constant speed auto zoom function.

  In the present invention, the second state is a state in which the zoom is stopped, the first state is a state not including the state in which the zoom is stopped, and the moving speed of the zoom is less than a predetermined determination speed. It is desirable to be in a state where it is moving. This embodiment specifically shows a zoom state in which half of the constant speed control of the first constant speed control means or the second constant speed control means is executed when the instruction switch is turned on. It is.

  In the present invention, the zoom state determination unit determines whether the zoom state is the first state or the second state based on an operation signal output from the electric operation unit. It is desirable. This embodiment is an embodiment for determining the zoom state, and determines whether the zoom state is the first state or the second state based on the operation signal output from the electric operation means. Like to do.

  In the present invention, the electric operation means includes an operation member whose operation direction and operation amount are changed by an operation of an operator, and the movement direction and movement speed of the zoom corresponding to the operation direction and operation amount of the operation member are determined. It is possible to adopt a form that is an operation means for outputting an operation signal for instructing. In the present embodiment, an operation means for outputting an operation signal for instructing a moving direction and a moving speed of a zoom by an operation member such as a seesaw switch is assumed as an electric operation means.

  When such an electric operation means is employed, the following forms can be employed.

  The zoom state determination unit detects an operation amount of the operation member based on an operation signal output from the electric operation unit, and is in the first state based on the detected operation amount, or Whether the state is the second state can be determined.

  Further, when the zoom state determination unit detects that the ratio of the detected operation amount of the operation member to the maximum operation amount is greater than 0 and less than a predetermined determination ratio, the zoom state determination unit is in the first state. If it is determined that the ratio is 0, the second state can be determined. The determination ratio is preferably 50%.

  The first constant speed control means and the second constant speed control means operate the operation member based on an operation signal output from the electric operation means when the zoom is moved at a constant speed. It is desirable to stop the constant speed movement of the zoom when an amount is detected and an operation in which the ratio is equal to or greater than a predetermined determination ratio is detected. The determination ratio is preferably 50%. This form shows one form of operation for stopping constant speed movement.

  The first constant speed control means and the second constant speed control means operate the operation member based on an operation signal output from the electric operation means when the zoom is moved at a constant speed. If the detected operation direction indicates a movement in a movement direction opposite to the movement direction of the constant speed movement of the zoom, the movement direction of the constant speed movement of the zoom is reversed to It is desirable to move the zoom at a constant speed. This form shows one form of operation which reverses the direction of constant speed movement.

  According to the present invention, the convenience of the constant speed control function of zoom can be improved.

The top view which showed the external appearance of the ENG lens with which the drive unit to which this invention was applied was mounted | worn A rear view showing the appearance of an ENG lens equipped with a drive unit to which the present invention is applied The block diagram which showed the internal structure of the lens drive device to which this invention was applied A flowchart showing the processing procedure of the CPU regarding the constant speed auto zoom function

  Hereinafter, a preferred embodiment of a lens driving device according to the present invention will be described in detail with reference to the accompanying drawings.

  1 and 2 are a plan view and a rear view showing the external appearance of an ENG lens to which a drive unit to which the present invention is applied is mounted. An ENG lens 1 shown in these drawings is an inner focus type zoom lens used for a broadcast television camera such as an ENG camera. The lens barrel 2 is provided with a focus ring 4, a zoom ring 6, and an iris ring 8. An extender device 10 is provided at the rear of the iris ring 8. At the rear end portion of the lens barrel 2, a mount portion 12 is provided that is detachably attached to a lens mount of a camera body (camera head) on which an imaging element or the like is mounted.

  A drive unit 14 for driving the focus ring 4, zoom ring 6 and iris ring 8 with a motor is attached to the side of the lens barrel 2.

  Although a detailed description of the internal configuration of the lens barrel 2 is omitted, as is well known, as a photographing optical system supported in the lens barrel 2, a fixed focus lens group and a moving focus are sequentially arranged from the front (subject side). A lens (simply referred to as a focus lens group), a variable power lens group (zoom lens group), a diaphragm (aperture device), a relay lens group, and the like are arranged. Then, by rotating the focus ring 4, the focus lens group moves back and forth along the optical axis, the focus (focus position) of the photographing optical system moves to the near side or infinity side, and the zoom ring 6 rotates. As a result, the zoom lens group is moved back and forth along the optical axis, the zoom (focal length) of the photographing optical system is moved to the wide side or the tele side, and the iris diameter is changed by rotating the iris ring 8. However, the aperture value of the photographing optical system is increased or decreased.

  The drive unit 14 has a case 18 that is attached to the side of the lens barrel 2 with screws 19 and 19.

  In the case 18, a focus driving motor, a zoom driving motor, and an iris driving motor shown in FIG. The focus drive motor is connected to the focus ring 4 via a gear transmission mechanism (not shown), and the focus ring 4 is rotated by the power of the focus drive motor. Note that some drive units 14 are not equipped with a focus drive motor, and in this embodiment, the focus drive motor may not be installed.

  The zoom drive motor is connected to the zoom ring 6 via a gear transmission mechanism (not shown), and the zoom ring 6 is rotated by the power of the zoom drive motor. Similarly, the iris driving motor is connected to the iris ring 8 through a gear transmission mechanism (not shown), and the iris ring 8 is rotated by the power of the iris driving motor.

  A zoom seesaw control switch 20 (hereinafter referred to as seesaw switch 20), an aperture auto / manual mode switch 22, an iris momentary switch 24, a return switch 26, and the like are provided on the upper surface of the case 18. Also, a preset on switch 30 (or simply referred to as an on switch 30) and a preset memo switch 32 (or simply referred to as a memo switch 32) are provided near the mounting screws 19 and 19. The switches 22, 24, and 26 are switches used for well-known functions and will not be described.

  The seesaw switch 20 is a zoom and electric operation member, and is provided so as to automatically return to a predetermined neutral position when not operated and to swing (turn) to the positive side and the negative side depending on the position where the pushing operation is performed. It has been. The swing directions on the positive side and the negative side of the seesaw switch 20 are associated with an operation direction for moving the zoom to the tele side and an operation direction for moving the zoom to the wide side, and the operation direction of the seesaw switch 20 is, for example, When the push operation is performed so as to be on the tele side, the zoom ring 6 is rotated to the tele side by the zoom driving motor, and the zoom (zoom lens group) of the photographing lens is moved to the tele side. In addition, the moving speed (zoom speed) of the zoom (zoom lens group) can be adjusted by the amount of pressing (operation amount) of the seesaw switch 20 at that time. The larger the operation amount, the faster the moving speed of the zoom.

  The preset on switch 30 (on switch 30) and the preset memo switch 32 (memo switch 32) are switches used for the position preset function. The position preset function is a function that allows a zoom to be moved (reproduced) from an arbitrary position to a preset position by a predetermined switch operation by storing a desired zoom position as a preset position. When both the on switch 30 and the memo switch 32 are pressed (when turned on), the zoom position at that time is stored as a preset position. On the other hand, when only the ON switch 30 is pressed (the memo switch 32 is in the OFF state), the zoom moves to the preset position.

  A grip band 40 is provided on the side surface of the case 18. An operator (cameraman) can hold the lens barrel 2 by inserting the right hand (four fingers other than the thumb) into the grip band 40.

  A VTR switch 42 and a constant speed auto zoom switch 44 are provided on the rear surface of the case 18 (see FIG. 2). The VTR switch 42 is a switch for operating recording start / end when recording (recording) an image being shot on a video tape.

  The constant speed auto zoom switch 44 is a switch for executing a constant speed auto zoom function. Although the details will be described later, the constant-speed auto zoom function according to the present embodiment zooms when the constant-speed auto zoom switch 44 is pressed while the seesaw switch 20 is operated like the conventional constant-speed auto zoom function. Is started at a constant speed in the moving direction and moving speed at that time. When the constant speed control is started, the constant speed control is continued even when the operation of the seesaw switch 20 is canceled (state when not being operated) or changed, and the constant speed movement of the zoom is continued. On the other hand, when the constant speed control is being performed, for example, when the switch 32 is pressed again, the constant speed control is stopped and the zoom moves according to the operation of the seesaw switch 20.

  Further, when the constant speed auto zoom switch 44 is pressed while the seesaw switch 20 is not operated, the constant speed control is performed under the same conditions as the moving direction and the moving speed in the previously executed constant speed control. Yes.

  A zoom maximum speed adjustment knob 46 is provided on the rear surface of the case 18. By rotating this knob 46, the zoom moving speed with respect to the operation amount (pushing amount) of the seesaw switch 20 can be appropriately changed. It is like that. That is, the zoom moves to the tele side or the wide side at the maximum speed at the maximum operation amount when the seesaw switch 20 is pushed deepest into the tele side or the wide side. The maximum zoom speed is adjusted with the zoom maximum speed adjustment knob. 46 can be adjusted. Note that the zoom moving speed at the time of reproduction of the preset position by the position preset function is also variable according to the set position of the zoom maximum speed adjusting knob 46.

  Also, reference numeral 48 shown in FIG. 2 denotes an extender switching lever. By rotating the lever 48, a double extender lens can be inserted into and removed from the optical path.

  FIG. 3 is a block diagram showing an internal configuration of the drive unit 14 of the ENG lens 1, and is a block diagram mainly showing components related to the constant speed auto zoom function of the drive unit 14.

  This figure shows a focus lens group FL, a zoom lens group ZL, and an aperture I that are operated by rotation of the focus ring 4, zoom ring 6 and iris ring 8 of the lens barrel 2 shown in FIG. A focus drive motor FM, zoom drive motor ZM, and iris drive motor IM in a drive unit 14 connected to each of the ring 4, zoom ring 6, and iris ring 8 are shown. The power transmission mechanisms such as the focus ring 4, the zoom ring 6, and the iris ring 8 that transmit the power of the motors FM, ZM, and IM to the focus lens group FL, the zoom lens group ZL, and the aperture stop I are omitted in FIG.

  In the drive unit 14, as shown in the figure, a control system such as a CPU 60, a D / A converter 62, an A / D converter 64, a focus amplifier FA, a zoom amplifier ZA, and an iris amplifier IA is configured. Various circuit components are mounted.

  The CPU 60 drives the focus lens group FL, the zoom lens group ZL, and the diaphragm I by the respective motors FM, ZM, and IM, moves the focus and zoom of the photographing optical system, and changes the aperture value. , ZM, and a drive signal having a value corresponding to the speed (direction and speed) at which IM is rotated. The drive signal is converted from a digital signal to an analog signal by the D / A converter 62 and then input to each of the amplifiers FA, ZA, and IA. Then, the drive voltage obtained by amplifying the drive signal by each amplifier FA, ZA, IA is applied to each motor FM, ZM, IM, so that each motor FM, ZM, IM rotates at a rotation speed corresponding to the value of the drive signal. It has become. As a result, the motors FM, ZM, and IM to which the focus lens group FL, the zoom lens group ZL, and the aperture stop I are respectively connected are operated at a speed based on the drive signal from the CPU 60. . Therefore, the CPU 60 can control the moving speed of the focus and zoom and the changing speed of the aperture value according to the value of the drive signal.

  The drive unit 14 is provided with a focus lens group FL, a zoom lens group ZL, and a potentiometer for detecting the current position of the stop I. These potentiometers are, for example, the motors FM, ZM, IM. It is connected to the rotating shaft. In the drawing, only a zoom potentiometer ZP for detecting the position of the zoom lens group ZL is illustrated. The position signal output from each potentiometer is given to the CPU 60 via the A / D converter 64. Therefore, the CPU 60 can control the positions of the focus lens group FL, the zoom lens group ZL, and the diaphragm I by controlling the rotational speeds of the motors FM, ZM, and IM with the drive signals while referring to the position signals. The focus position, zoom position, and aperture value can be controlled.

  A camera body (camera head) 70 shown in the figure is a camera body to which the ENG lens 1 is attached, and the drive unit 14 and the camera body 70 are electrically connected by a cable. Thus, the CPU 60 can exchange various information with the camera body 70 through serial communication via the serial communication interface (SCI) 66. Further, by reading an analog signal from the camera body 70 via the A / D converter 68, information can be exchanged with the camera body 70 using a parallel signal including an analog signal. For example, the position for setting the aperture I is given from the camera body 70 to the CPU 60, and the CPU 60 controls the position of the aperture I with the position given from the camera body 70 as a target position.

  Hereinafter, the zoom control in the CPU 60 will be described. In the figure, the seesaw switch 20 and the constant speed auto zoom switch 44 provided in the case 18 of the drive unit 14 shown in FIG. 1 are shown.

  The seesaw switch 20 is a switch that automatically returns to a predetermined neutral position when not operated as described above, and can change the swing direction (operation direction) between the tele side and the wide side according to the position where the push operation is performed. For example, it is connected to a rotary shaft of a potentiometer. The output signal of the potentiometer is given to the CPU 60 as an operation signal of the seesaw switch 20. In the CPU 60, the operation direction and the operation amount of the seesaw switch 20 (the pushing amount with the neutral position set to 0 by the operation signal). ) Is detected.

  During normal zoom control, the CPU 60 moves the zoom lens group ZL by the zoom drive motor ZM based on the operation signal from the seesaw switch 20 and moves the zoom at a speed corresponding to the operation of the seesaw switch 20. That is, when the operation direction of the seesaw switch 20 is the tele side, the zoom is moved to the tele side, and the zoom is moved at a moving speed corresponding to the operation amount. On the other hand, when the operation direction of the seesaw switch 20 is the wide side, the zoom is moved to the wide side and the zoom is moved at a movement speed corresponding to the operation amount.

  The constant-speed auto zoom switch 44 is a switch used for the constant-speed auto zoom function as described above, and automatically returns to the off state when not operated, and turns on when the operator presses the switch. / Off switch. The on / off state of the constant speed auto zoom switch 44 is read by the CPU 60.

  When the CPU 60 detects that the constant speed auto zoom switch 44 is turned on by pressing the constant speed auto zoom switch 44, the CPU 60 executes processing of the constant speed auto zoom function and the seesaw switch 20 at that time. The following processing is executed according to the operation amount.

The operation amount S from the neutral position of the seesaw switch 20 when the constant speed auto zoom switch 44 is turned on is expressed by the following equation (1):
0 (percent) <S <50 (percent) (1)
If the above condition is satisfied, constant speed control is started to move the zoom at a constant speed with the movement direction and movement speed based on the operation direction and operation amount of the seesaw switch 20 at that time. The operation amount S indicates a value when the ratio of the operation amount of the seesaw switch 20 to the maximum operation amount is expressed as a percentage.

  According to this, when the operator operates the seesaw switch 20 to move the zoom at a desired operation direction and moving speed as in the conventional constant speed auto zoom function, the constant speed auto zoom switch 44 is pressed. Then, the constant speed movement of the zoom is started with the operation direction and the moving speed at that time. Note that the constant-speed auto-zoom function is a function that is normally used when it is desired to move the zoom at a low speed at a low speed, so that the constant-speed control is started only when the operation amount S is less than 50%. Even if there is such a limitation, there is no special problem. However, it may be a numerical value other than 50%. In the above formula (1), the numerical value of 0 percent is a value for determining whether or not the seesaw switch 20 is not operated, and it may be a value other than 0 in consideration of an error or the like. good.

  Further, when the operation amount S of the seesaw switch when the constant speed auto zoom switch 44 is turned on satisfies the condition of the above equation (1) and the constant speed control is started, the CPU 60 displays the current zoom at that time. Are stored as a preset direction and preset speed in a memory (not shown). As information of the zoom movement direction and movement speed stored at this time, for example, the value of the current operation signal from the seesaw switch 20 or the CPU 60 outputs it for driving the zoom drive motor ZM based on this value. Store the current value of the drive signal. The zoom moving direction and moving speed calculated based on the amount of change per unit time of the position signal from the zoom potentiometer ZP may be stored as a preset direction and a preset speed, or the zoom driving motor ZM A speed sensor is connected to the rotating shaft to directly detect the moving direction and moving speed of the zoom, and the moving direction and moving speed of the zoom detected by the speed sensor are stored as a preset direction and a preset speed. Also good.

  On the other hand, when the operation amount S of the seesaw switch when the constant speed auto zoom switch 44 is turned on is 0 (percent), the zoom is moved at a constant speed in the preset direction and preset speed stored as described above. . According to this, when the operator presses the constant speed auto zoom switch 44 without operating the seesaw switch 20, the zoom is fixed under the same conditions as the zoom moving direction and moving speed in the constant speed control executed last time. It can be moved quickly. That is, when the operator operates the seesaw switch 20 within a range that satisfies the condition of the above equation (1) and presses the constant speed auto zoom switch 44 to execute the constant zoom control, the zoom operation at that time is automatically performed. The moving direction and moving speed are stored as a preset direction and a preset speed. After that, the operator can execute the constant speed control under the same conditions as the constant speed control executed last time only by pressing the constant speed auto zoom switch 44 without operating the seesaw switch 20. Therefore, constant speed control can be executed under the same conditions as many times as possible.

  When the operation of the seesaw switch 20 such that the operation amount S exceeds 50% (operation for instructing movement at a movement speed exceeding a predetermined determination speed) is performed during the constant speed control. Alternatively, when the constant speed auto zoom switch 44 is pressed again, the constant speed control is stopped.

  In addition, during the constant speed control, when the seesaw switch 20 is operated to instruct the moving direction opposite to the moving direction of the zoom moving at the constant speed, the moving direction of the zoom is reversed to perform the constant speed control. It may be continued. The operation of the seesaw switch 20 at this time may be limited to an operation in a range where the operation amount S is 50% or less in order to prevent confusion with an operation for stopping the constant speed control. The operation direction of the seesaw switch 20 when the constant speed control is stopped may be limited to only the moving direction in which the zoom is moving.

  The flowchart of FIG. 4 shows the processing procedure (processing related to zoom control) of the CPU 60 related to the above constant speed auto zoom function.

  In step S10 after performing the required initial settings, the operation amount S of the seesaw switch 20 is detected based on the operation signal output from the seesaw switch 20, and it is determined whether or not the operation amount S of the seesaw switch 20 is 0 percent. judge. When it determines with NO, it transfers to step S12, and when it determines with YES, it transfers to step S26.

In step S12, the operation amount S of the seesaw switch 20 is set to the condition of the above equation (1), that is,
0 (percent) <S <50 (percent) (1)
It is determined whether or not the above condition is satisfied. When it determines with YES, it transfers to step S14, and when it determines with NO, it transfers to step S28.

  In step S14, it is determined whether or not the constant speed auto zoom switch 44 has been pressed (turned on). When it determines with YES, it transfers to step S16, and when it determines with NO, it transfers to step S28.

  In step S16, the current zoom movement direction and movement speed are stored as a preset direction and a preset speed. That is, when the constant speed auto zoom switch 44 is pressed in a state where the operation amount S of the seesaw switch 20 satisfies the condition of the above equation (1), the zoom moving direction and moving speed at that time are preset direction and preset. Store in memory as speed. After this processing, the process proceeds to step S18.

  In step S18, the preset direction and preset speed are read from the memory, and the zoom is moved at a constant speed under the conditions. After this process, the process proceeds to step S20.

  In step S20, it is determined whether or not the operation amount S of the seesaw switch 20 exceeds 50 (percent). When it determines with NO, it transfers to step S22, and when it determines with YES, it transfers to step S24.

  In step S22, it is determined whether the zoom has reached the tele end or the wide end. When it determines with NO, it returns to step S18, and when it determines with YES, it transfers to step S24. That is, when the zoom does not reach either the bottom end or the wide end, and the operation amount S of the seesaw switch 20 does not exceed 50%, the process of step S18 is repeated and the constant movement of the zoom is continued. The

  In step S24, the constant speed control process is stopped and the zoom is stopped. That is, during constant speed control, when the operation amount S of the seesaw switch 20 exceeds 50%, or when the zoom reaches either the tele end or the wide end, the constant speed control of the zoom is stopped. To stop zooming. Then, the process returns to step S10. In addition, after the seesaw switch 20 is operated so that the operation amount S exceeds 50% and the constant speed control process is stopped, until the operation amount S of the seesaw switch 20 becomes zero, normal zoom control (seesaw control) The zoom may be stopped without returning to (zoom control based on the operation of the switch 20), or may be returned to normal control immediately after the constant speed control process is stopped.

  In step S26 when it is determined as YES in step S10, it is determined whether or not the constant speed auto zoom switch 44 is pressed. When it determines with YES, it transfers to step S18, and when it determines with NO, it transfers to step S28. That is, when the constant speed auto zoom switch 44 is pressed while the seesaw switch 20 is not operated, the process proceeds to step S18, and the zoom moving direction and moving speed at that time are set to the preset direction and the preset speed as described above. Remember as speed.

  In step S28, normal zoom control processing is executed. That is, when it is determined in step S12 that the operation amount S of the seesaw switch 20 does not satisfy the above formula (1), or when it is determined in steps S14 and S26 that the constant speed auto zoom switch 44 is not pressed. Performs normal zoom control processing, and moves the seesaw switch 20 at a moving direction and a moving speed in accordance with the operating direction and the operation amount. After this process, the process returns to step S10.

  As described above, in the above embodiment, the zoom is moved at a constant speed with the current zoom moving direction and moving speed according to the operation amount S of the seesaw switch 20 when the constant speed auto zoom switch 44 is turned on. Whether or not the zoom is moved at a constant speed in the same movement direction and movement speed as in the constant speed control (that is, the preset direction and the preset speed) is discriminated. It can be considered as a form of discrimination based on the state. That is, the zoom moving speed when the constant speed auto zoom switch 44 is turned on may be detected, and the above determination may be made based on the moving speed. In the above embodiment, it can be considered that the zoom moving speed is indirectly detected by the operation amount S of the seesaw switch 20.

  Specifically, when the constant speed auto zoom switch 44 is pressed when the zoom movement speed is greater than 0 and less than the determination speed, the zoom is determined with the current zoom movement direction and movement speed. When the constant speed auto zoom switch 44 is pressed when the zoom movement speed is 0, the zoom is moved at a constant speed with the same movement direction and movement speed as in the previous constant speed control. Also good. In the above embodiment, it can be considered that the moving speed of the zoom is indirectly detected by the operation amount S of the seesaw switch 20. Further, an operation signal output from the operation means is used even when an operation means for instructing a zoom movement position is used instead of an operation means for instructing a zoom movement direction or movement speed like the seesaw switch 20. The above determination can be made in the same manner by indirectly detecting the zoom state based on the above.

  Further, in the above embodiment, in the above embodiment, the present invention is applied to a lens driving device in which the operating unit (seesaw switch 20 and constant speed auto zoom switch 44) is provided in the driving unit 14 of the ENG lens 1. However, as long as the lens driving device has the same configuration as that of FIG. 3, the present invention can be applied to any lens driving device constructed by any system configuration. For example, the present invention is also applicable to a lens drive device constructed by connecting a controller equipped with an operation means such as an EFP lens to the lens device, or a controller connected to the drive unit 14. it can.

DESCRIPTION OF SYMBOLS 1 ... ENG lens, 2 ... Lens barrel, 4 ... Focus ring, 6 ... Zoom ring, 8 ... Iris ring, 12 ... Mount part, 14 ... Drive unit, 20 ... Seesaw switch (zoom seesaw control switch), 44 ... Fixed Fast auto zoom switch, 60 ... CPU

Claims (10)

Electric operation means for outputting an operation signal instructing the moving direction and moving speed of the zoom of the photographing optical system or the moving position of the zoom according to the operation of the operator;
Zoom control means for controlling the zoom based on an operation signal output from the electric operation means;
An instruction switch that can be switched between an on state and an off state;
Zoom for determining whether the zoom state controlled by the zoom control means is a first state that does not include at least a stopped state or a second state that does not include at least the first state State discrimination means;
When it is determined that the first state is detected by the zoom state determining unit and the instruction switch is turned on, the zoom is performed with the current zoom moving direction and moving speed at the time of the detection. And a first constant speed control means for storing the moving direction and moving speed as a preset direction and preset speed,
When it is determined by the zoom state determining means that the second state is set and the instruction switch is turned on, the preset direction and the preset speed stored by the first constant speed control means are used. Second constant speed control means for moving the zoom at a constant speed;
A lens driving device comprising:   The second state is a state in which the zoom is stopped, and the first state is a state that does not include the state in which the zoom is stopped, and the zoom moves at a moving speed less than a predetermined determination speed. 2. The lens driving device according to claim 1, wherein   The zoom state determination unit determines whether the zoom state is the first state or the second state based on an operation signal output from the electric operation unit. The lens driving device according to claim 1 or 2.   The electric operation means includes an operation member whose operation direction and operation amount are changed by an operation of an operator, and an operation signal for instructing the movement direction and movement speed of the zoom corresponding to the operation direction and operation amount of the operation member. The lens driving device according to claim 3, wherein the lens driving device is an operating means for outputting   The zoom state determination unit detects an operation amount of the operation member based on an operation signal output from the electric operation unit, and is in the first state based on the detected operation amount, or The lens driving device according to claim 4, wherein it is determined whether the state is the second state.   When the zoom state determination unit detects that the ratio of the detected operation amount of the operation member to the maximum operation amount is greater than 0 and less than a predetermined determination ratio, the zoom state determination unit is in the first state. 6. The lens driving device according to claim 5, wherein the lens driving device is determined to be in the second state when it is determined that the ratio is zero.   The lens driving apparatus according to claim 6, wherein the zoom state determination unit sets the determination ratio to 50%.   The first constant speed control means and the second constant speed control means adjust an operation amount of the operation member based on an operation signal output from the electric operation means when the zoom is moved at a constant speed. 8. The lens driving device according to claim 4, wherein the constant speed movement of the zoom is stopped when an operation in which the ratio is equal to or greater than a predetermined determination ratio is detected. .   The lens driving device according to claim 8, wherein the first constant speed control unit and the second constant speed control unit set the determination ratio to 50%.   The first constant speed control means and the second constant speed control means change an operation direction of the operation member based on an operation signal output from the electric operation means when the zoom is moved at a constant speed. If the detected operation direction indicates a movement in a movement direction opposite to the movement direction of the constant speed movement of the zoom, the movement direction of the constant speed movement of the zoom is reversed to perform the zoom. The lens driving device according to any one of claims 4 to 9, wherein the lens driving device is moved at a constant speed.

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