JP5840901B2 - Lens device - Google Patents

Description

  The present invention relates to a lens apparatus, and more particularly to a lens apparatus having a variable operation torque.

  A lens device mounted on a TV camera or the like generally includes a focus ring, a zoom ring, and an iris ring, and a user (cameraman) rotates these rings to adjust the focus position, zoom magnification, iris value, and the like. However, there is a known lens device that allows the user to adjust the operating torque of these rings. For example, in the technique described in Patent Document 1, the operating torque is adjusted by inserting an elastic member and a sliding member into the gap between the lens barrel body and the outer operating ring, and adjusting the biasing force to the sliding member. It is described to do.

  Moreover, in the technique described in Patent Document 2, it is described that the magnitude of the force generated by the induced electromotive force is changed and the load of the operation torque is changed by adjusting the interval between the opposing permanent magnets.

Japanese Patent Laid-Open No. 6-123829 Japanese Patent Laid-Open No. 7-191254

  However, in the lens barrel described in Patent Document 1, the sliding member is pressed against the barrel body to generate a frictional force. However, the operation torque is adjusted by adjusting the screwing amount of the operation lever. When the user operates the lens device, it is difficult to immediately set the operation torque to an arbitrary value. In the photographing apparatus described in Patent Document 2, the knob is rotated to change the distance between the permanent magnet and the fin to control the magnitude of the magnetic field acting on the fin. When operating the lens device, it is difficult to immediately set the operating torque to a desired magnitude.

  In general, when manually operating a zoom lens, etc., when moving the zoom lens quickly between the wide end and the tele end, or when moving the focus lens quickly between the close end and the infinity end, A smaller operating torque is easier to operate, while a slower operating torque is easier to operate when the operating torque is larger. Further, the magnitude of the operating torque varies depending on the photographer's preference.

  The present invention has been made based on such circumstances, and it is an object of the present invention to provide a lens device that can be operated with an operation torque according to a user's preference or according to a shooting situation.

To achieve the above object, a lens device according to the first aspect of the present invention includes a lens barrel, and the outer can disposed the pivoted concentrically operation ring lenses barrel lenses a lens apparatus having a cam barrel to be arranged concentrically rotates a operation ring integrally on the inside of the barrel, the rotational speed and the rotational speed of the operation ring or cams cylinder storage means the relationship is stored in advance in the operating torque target value corresponding, detection means that by the user operation ring or for detecting the operating speed of the cams cylinder, on the basis of the operating speed it detects memorize It reads the operating torque target value from the means, and the control target setting means for setting the operation torque target value, as operating torque of operation rings or cams cylinder is set by the operation torque target value, operation large auxiliary torque ring or added to the cams tube And torque control means for varying the of, Ru comprising a. According to the lens device according to the first aspect, the target value of the operation torque is set according to the operation speed of the operation ring or the cam cylinder by the user, and the magnitude of the auxiliary torque applied to the operation ring or the cam cylinder is Since the control is performed so that the target value is realized, the user can operate the lens apparatus with an operation torque according to his / her preference or according to the shooting situation.

  In the lens apparatus according to the first aspect, the relationship between the operation speed and the target value may be stored in advance in the storage means according to the user's preference or according to the shooting situation. The “operation ring” may be a focus ring, a zoom ring, an iris ring, or the like.

As shown in the second aspect of the present invention, in the lens device according to the first aspect, the memorize means, the relationship between the operating speed and operating direction of the operation ring or cams cylinder and the operating torque target value There have been stored in advance, detection means the operation ring or that by the user detects the operating speed and operating direction of the cams cylinder, the control target setting means, based on the operation speed and operation direction has detected Te Symbol set operating torque target value by reading the operating torque target value from憶means, torque control means, as operating torque of operation rings or cams cylinder is set by the operation torque target value , it may be to vary the magnitude and direction of the operation ring or assist torque exerted on cams tube. In the lens device according to the second aspect, the control is performed in consideration of the operation direction in addition to the operation speed of the operation ring or the cam cylinder by the user. The lens device can be operated with an operation torque according to the situation.

As shown in the third aspect of the present invention, in the lens device according to the second aspect, the memorize means the relationship between the operating speed and operating direction of the operation ring or cams cylinder and the operating torque target value A plurality of storage units may be stored, and a selection unit that selects a relationship used for setting the operation torque target value from the plurality of stored relationships may be further included. Thereby, the user can obtain a more appropriate operation torque by arbitrarily changing the relationship used for setting the operation torque target value, and can also correspond to a plurality of users.

As shown in the fourth aspect of the present invention, in the lens device according to the second or third aspect, the torque control means includes operation ring or suppressing member is pressed against the cams tube, suppression it may be to vary the direction and magnitude of the auxiliary torque by increasing or decreasing the frictional force by pressing of use members. A 4th aspect shows an example of the specific content of torque control.

As shown in a fifth aspect of the present invention, in the lens device according to a fourth aspect, the abrasive suppression member, operation ring or depressive portions braking member is pressed against the cams barrel wear It may be higher than sex. In the fifth aspect, the wearability of the restraining member is made higher than the wearability of the portion against which the restraining member is pressed, from the viewpoint of labor and cost of maintenance and replacement of the member.

As shown in a sixth aspect of the present invention, disposed in the lens device according to the second embodiment, the torque control means, in the circumferential direction in one of the operation ring or cams cylinder and lenses barrel and magnets has a coil current flows in the axial direction of the arranged of Lele lens device on the other, by adjusting the direction and magnitude of the current flowing through the coils, the magnet and the coils controls induced electromotive force direction and magnitude of occurring during, may be to vary the direction and magnitude of the I Riho auxiliary torque thereto. The sixth aspect shows another example of specific contents of torque control, and the object of the present invention can be achieved also by such an aspect.

As shown in a seventh aspect of the present invention, in the lens device according to the second aspect, the torque control means operation and the motor, the torque mounting et Re motors occurs in the rotation shaft of the motors ring or comprises a cylindrical or disk-shaped rotary member is transmitted to the cams tube, and in surface contact with the rotating member and the operation ring or cams cylinder torque control means of motors direction and magnitude of the auxiliary torque by changing the rotational speed and direction may be changed to. The seventh aspect shows still another example of specific contents of torque control, and the object of the present invention can be achieved also by such an aspect.

As shown in the eighth aspect of the present invention, in the lens device according to the sixth or seventh aspect, the torque control means, when the rotation speed is detected is the first threshold value or more, operation ring or alter the direction and magnitude of the auxiliary torque to assist the rotation of the cams cylinder, rotational speed was detected following the first threshold value is smaller than the second threshold when it may be changed the direction and magnitude of the auxiliary torque for suppressing the rotation of the operation ring or cams tube. As a result, when you want to move and operate the focus lens, zoom lens, and iris quickly, rotate the operating ring quickly to reduce the operating torque, while when you want to move and operate slowly, operate the operating ring slowly. The torque can be increased, and the lens apparatus can be operated with an operation torque according to the user's preference and shooting conditions.

  As described above, according to the lens device of the present invention, the user can operate with an operation torque according to his / her preference or according to the shooting situation.

1 is an external view of a lens apparatus according to an embodiment of the present invention. It is a figure which shows the mode of the operation torque control by the member for suppression concerning the 1st Embodiment of this invention. It is a figure which shows the mode of the operation torque control based on the 2nd Embodiment of this invention using an electromagnetic force. It is sectional drawing which concerns on the 2nd Embodiment of this invention and shows the structure of a lens apparatus, and arrangement | positioning of the member for torque control. It is a figure which shows the mode of electromagnetic force generation concerning the 2nd Embodiment of this invention. 7 is a flowchart illustrating control of operation torque according to the second embodiment of the present invention. It is a figure which concerns on the 3rd Embodiment of this invention and shows the mode of the operation torque control by a motor. It is a flowchart which shows control of the operation torque concerning the 3rd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out a lens device according to the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is an external view of a lens apparatus 2 according to the first embodiment of the present invention. The lens barrel 4 of the lens device 2 is provided with a focus ring 10, a zoom ring 12 and an iris ring 14. Although the internal structure of the lens device 2 is not illustrated, as is generally known, a fixed focus lens, a moving focus lens, a variable power lens, an iris, a relay lens, and the like are sequentially provided in the lens barrel from the front. Is provided. When the focus ring 10 is rotated, the moving focus lens is moved back and forth along the optical axis to perform focus adjustment, and when the zoom ring 12 is rotated, the magnification is moved back and forth along the optical axis. Zoom adjustment is performed. Further, the iris diaphragm system is adjusted by rotating the iris ring 14.

  A drive unit 20 is screwed to the lens barrel 4. This drive unit incorporates a focus drive motor, a zoom drive motor, an iris drive motor, and the like (not shown), and the focus ring 10, zoom ring 12, and iris ring 14 via a gear transmission mechanism (not shown). Are engaged with each other, and these rings are driven to rotate. The drive unit 20 contains a CPU 40 for controlling the motor, an EEPROM 42 for recording programs and data necessary for the control, a sensor 30 and the like.

  Further, the drive unit 20 is provided with various switches such as a zoom seesaw control switch and a preset switch so that shooting start / end and zoom operation can be performed. These switches include a table data setting dial 21. By rotating the table data setting dial 21, the relationship between the rotational speed and direction of the focus ring 10 and the operation torque target value is determined. The desired relationship can be set (described later).

  Next, the part which concerns on this Embodiment among the structures of the lens apparatus 2 is demonstrated. FIG. 2 is a conceptual diagram showing the cam barrel 6 and the related members disposed inside the lens barrel 4. As shown in FIG. In the lens device 2, when the user rotates the focus ring 10, the cam cylinder 6 rotates integrally therewith, and this rotation causes the lens barrel 4 via a mechanism such as a cam groove, a cam pin, or a straight groove. The inner lens moves back and forth along the optical axis. A gear 28 is provided on the base end side (right side in FIG. 2) of the cam cylinder 6, and a sensor 30 such as a rotary encoder coupled to the gear 28 detects the rotational speed and direction of the cam cylinder 6.

  The detected rotation speed and direction are input to the CPU 40. The EEPROM 42 stores table data indicating the relationship between the rotational speed and direction and the target torque, and the CPU reads this table data and sets the target value of the operation torque. The CPU 40 also calculates the direction and magnitude of the auxiliary torque applied to the cam cylinder from the input rotational speed and direction and the set target value of the operating torque, and changes the direction and magnitude of the auxiliary torque. Thus, control is performed so that the target value of the operation torque is achieved.

  Specifically, the CPU 40 adjusts the force F1 that the actuator 22 presses the suppression member 24 against the ring 26 provided at the base end portion of the cam cylinder 6 to change the frictional force generated by the pressing, thereby changing the auxiliary torque. The direction and size of the are changed. At this time, a certain bias is applied to the pressing force F1 of the suppressing member 24, and the pressing force F1 can be further increased or decreased depending on the direction and magnitude of the auxiliary torque. Since it is considered that the desired operation torque varies depending on the user, the lens apparatus 2 has a plurality of table data indicating the relationship between the rotation speed and direction of the cam cylinder 6 detected by the sensor 30 and the operation torque target value in the EEPROM 42. The user can select desired table data by rotating the table data setting dial 21.

  In this way, by controlling the actuator 22 and the suppression member 24 to change the direction and magnitude of the auxiliary torque so that the target value of the operation torque is achieved, the user can adjust his / her preference. Alternatively, the lens device 2 can be operated with an operation torque according to the shooting situation.

  In the first embodiment, when the cam cylinder 6 is rotated with the suppression member 24 pressed against the ring 26 of the cam cylinder 6, the suppression member 24 and the ring 26 are gradually worn over time. go. At this time, considering the time and cost required for the maintenance and replacement of the member, it is preferable to select the material so that the restraining member 24 is more easily worn than the ring 26. As a combination of such materials, for example, it is conceivable that the restraining member 24 is made of nylon and the ring 26 (or its outer peripheral portion) is made of Delrin (registered trademark). Delrin (registered trademark) is generally known as polyoxymethylene and is a polyacetal resin (POM) made from formaldehyde.

  In the present embodiment, the direction and the magnitude of the auxiliary torque are changed by changing the pressing force of the restraining member 24 against the cam cylinder 6, but the focus ring 10, the zoom ring 12, and the iris are changed instead of the cam cylinder 6. A restraining member for the ring 14 may be provided to change the pressing force.

<Second Embodiment>
In the first embodiment described above, the direction and magnitude of the auxiliary torque are changed by changing the pressing force of the restraining member 24 against the cam cylinder 6, but in the present invention, the operation torque control is limited to this. It is not something that can be done. In the second embodiment, a mode in which torque control is performed by using an induced electromotive force generated between a magnet and a coil will be described. In the following description, elements similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 3 is a conceptual diagram showing the main part of the lens apparatus according to the second embodiment. FIG. 3 shows a state in which the lens barrel 4 is arranged concentrically inside the focus ring 10. A gear 29 is formed on the base end side of the focus ring 10 (in the direction of arrow A2 in FIG. 3A), and the rotation speed and direction of the focus ring 10 are detected by a sensor 32 in contact with the gear 29. The detection result is input to the CPU 40 ', and the CPU 40' reads the table data stored in the EEPROM 42 'and sets the target value of the operation torque. As in the first embodiment, the EEPROM 42 ′ stores a plurality of table data indicating the relationship between the rotational speed and direction of the focus ring 10 and the operation torque target value, and the user turns the table data setting dial 21 ′. The desired table data can be selected by moving.

  A magnet (magnet) M is disposed on the inner peripheral surface of the focus ring 10 so that the N pole and S pole of the two magnets M face each other across the center axis of the ring. Thereby, the magnetic force lines ML are generated in the radial direction. On the other hand, a coil C is disposed on the outer peripheral surface of the lens barrel 4 along the axial direction of the lens barrel, and from the proximal end side of the lens barrel to the distal end side (in the direction of arrow A1) or the distal end side. A current flows from the base end to the base end (in the direction of arrow A2 in the figure). The direction and magnitude of the current are calculated by the CPU 40 ′ and controlled by the current control circuit 44.

  FIG. 4 is a cross-sectional view showing the relationship among the focus ring 10, the lens barrel 4, and the cam barrel 6. As described above, the focus ring 10 is provided with the magnet (magnet) M and the lens barrel is provided with the coil C, and has the same configuration as a so-called hollow motor. The magnet M is arranged so that the N pole and the S pole of the magnet are opposed to each other with the central axis of the focus ring interposed therebetween, and the coil C has one wiring that opposes the central axis of the lens barrel 4. A set of coils is formed.

  Next, the relationship between the direction of the current flowing through the coil C and the direction of the force generated thereby will be described. FIG. 5 is a diagram showing the relationship between the direction of the current flowing through the same line constituting the coil C, the direction of the magnetic field lines ML, and the force F2 generated thereby (when the lens barrel 4 is viewed from the upper side of FIG. 3A). ). In FIG. 5A, the current I flows in the direction of the arrow A1 (from the proximal end side to the distal end side of the lens barrel 4) in the wiring of the coil C, and the magnetic lines of force ML from the front side to the back side of the page. Therefore, the induced electromotive force F2 is generated in the direction from the top to the bottom of the figure. On the other hand, in FIG. 5B, a current I flows in the wiring of the coil C in the direction of the arrow A2 (from the front end side to the base end side of the lens barrel 4), and the magnetic field lines ML move from the front side to the back side of the drawing. Therefore, the induced electromotive force F2 ′ is generated in the direction from the bottom to the top of the figure. In this way, the direction of the induced electromotive force can be changed by changing the direction of the current flowing through the coil C arranged in the lens barrel 4, and thereby the direction of the auxiliary torque can be changed. In order to change the magnitude of the auxiliary torque, the magnitude of the current I may be changed.

  In FIG. 5, the description has been made by paying attention to the upper portion of the lens barrel 4. However, in the portion facing the central axis of the lens barrel 4, the same current can be obtained by passing a current in the opposite direction to the coil C. Can be controlled.

  FIG. 6 is a flowchart showing a process of operating torque control in the second embodiment. In the second embodiment, the direction and magnitude of the induced electromotive force are changed in consideration of the rotational speed and direction of the focus ring 10.

  First, in S100, it is determined whether the rotation direction of the focus ring 10 detected by the sensor 32 is clockwise as viewed from the front end side of the lens device 2. If YES, the process proceeds to S102, and it is determined whether the rotation speed of the focus ring 10 is a or more. If YES, the current corresponding to the rotation speed is supplied from the back of the coil C to the front (arrow A1 in FIG. 3). Direction). As a result, an induced electromotive force is generated in the direction of arrow F2 in FIG. 5A, and the rotation of the focus ring 10 is assisted. Such control is continued while the rotational speed is greater than or equal to a (NO in S106), and when the rotational speed becomes less than a (YES in S106), energization of the coil C is stopped in S108 and the process returns to S100.

  If NO in S102, the process proceeds to S110 to determine whether or not the rotational speed is equal to or less than b. If YES, the current corresponding to the rotational speed is changed from the front of the coil C to the back (in the direction of arrow A2 in FIG. 3) in S112. ). As a result, an induced electromotive force is generated in the direction of the arrow F2 'in FIG. 5B, and the rotation of the focus ring 10 is suppressed. Such control is continued while the rotation speed is equal to or lower than b (NO in S114), and when the rotation speed becomes faster than b (YES in S114), energization of the coil C is stopped in S108 and the process returns to S100. If NO in S110 (the rotational speed is faster than b), the energization of the coil C is stopped in S108 and the process returns to S100.

  On the other hand, if it is determined in S106 that the rotation direction of the focus ring 10 is counterclockwise when viewed from the front end side of the lens device 2, the process proceeds to S116. In S116, it is determined whether the rotation speed of the focus ring 10 is a or more. If YES, a current corresponding to the rotation speed is passed from the front of the coil C to the back (in the direction of arrow A2 in FIG. 3) in S118. As a result, an induced electromotive force is generated in the direction of the arrow F2 'in FIG. 5B, and the rotation of the focus ring 10 is assisted. Such control is continued while the rotational speed is greater than or equal to a (NO in S120). When the rotational speed is less than a (YES in S120), energization of the coil C is stopped in S122 and the process returns to S100. If NO is determined in S116, the process proceeds to S124 and it is determined whether or not the rotational speed is equal to or less than b. If YES, the current corresponding to the rotational speed is supplied from the back of the coil C to the front (in FIG. 3). Flow in the direction of arrow A1). Thereby, an induced electromotive force is generated in the direction of arrow F2 in FIG. 5A, and the rotation of the focus ring 10 is suppressed. Such control is continued while the rotation speed is equal to or lower than b (NO in S128). When the rotation speed becomes faster than b (YES in S128), energization of the coil C is stopped in S122 and the process returns to S100.

  According to such control, in the second embodiment, when it is desired to quickly move the focus lens between the close end and the infinity end, the operating torque is reduced by quickly rotating the focus ring 10, while slowly When it is desired to move the lens, the operating torque can be increased by slowly rotating the focus ring 10, and the lens device 2 can be operated with the operating torque corresponding to the shooting situation. The same control can be performed when the zoom ring 12 or the iris ring 14 is operated. Furthermore, by operating the table data setting dial 21 'to select desired table data, it is possible to operate with an operation torque according to the shooting situation and the photographer's preference.

  In the second embodiment, the case where the focus ring 10 is provided with a magnet and the lens barrel 4 is provided with a coil has been described. However, the zoom ring 12 and the iris ring 14 may be provided with a magnet. The arrangement of the magnet and the coil may be reversed between the ring and the lens barrel 4. Further, a magnet may be provided on the cam barrel 6 or the lens barrel 4, and a coil may be provided on the other. When these configurations are employed, the same control as described above can be performed depending on how the current flows according to each configuration.

<Third Embodiment>
In the third embodiment, a mode in which torque control is performed by a motor will be described. FIG. 7 is a conceptual diagram showing a main part of a lens apparatus according to the third embodiment. A gear 35 is formed on the base end side (the arrow A2 side in FIG. 7) of the focus ring 10, and the rotation speed and direction of the focus ring 10 are detected by a sensor 34 in contact with the gear 35. The detection result is input to the CPU 40 ″, and the CPU 40 ″ reads the table data stored in the EEPROM 42 ″ and sets the target value of the operation torque. The CPU 40 ″ sets the motor 36 so that the operation torque becomes the set target value. Control the rotation. The rotation of the motor 36 is transmitted to the focus ring 10 through a cylindrical transmission member 37. Similarly to the first and second embodiments, the EEPROM 42 ″ stores a plurality of table data indicating the relationship between the rotational speed and direction of the focus ring 10 and the operation torque target value. By rotating 21 ″, desired table data can be selected. In the following description, elements similar to those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 8 is a flowchart showing a process of operating torque control in the third embodiment. In the third embodiment, when the user rotates the focus ring 10 quickly, the rotation is assisted by the motor, and when the focus ring 10 is rotated slowly, the rotation is suppressed by the motor. Specifically, it is determined whether the rotational speed detected by the sensor 34 is a or more (S200). If YES, the motor 36 is rotated in a direction to assist the rotation of the focus ring 10 in S202. While the rotational speed is greater than or equal to a, the determination in S204 is NO, and the process returns to S202 to continue the rotation assistance of the cam cylinder 6, and when the rotational speed is less than a, the determination in S204 is YES and the process proceeds to S206. The energization to 36 is stopped, and the process returns to S200.

  On the other hand, when the rotation speed detected in S200 is less than a (determination is NO), the process proceeds to S208, and it is determined whether or not the rotation speed is equal to or less than b. In the case of YES, the process proceeds to S210 and the motor 36 is rotated in a direction to suppress the rotation of the focus ring 10. Such rotation suppression of the focus ring 10 is continued while the rotation speed is equal to or lower than b (NO in S212). When the rotation speed becomes faster than b (YES in S212), the energization to the motor 36 is stopped in S206, and S200. Return to. If NO in S208 (the rotational speed is faster than b), the process returns to S200.

  In the third embodiment, when the focus lens is to be quickly moved between the close end and the infinity end by such control, the operating torque is reduced by rotating the focus ring 10 quickly, while slowly. When it is desired to move the lens, the operating torque can be increased by slowly rotating the focus ring 10, and the lens device 2 can be operated with the operating torque corresponding to the shooting situation. The same control can be performed when the zoom ring 12 or the iris ring 14 is operated. Further, by operating the table data setting dial 21 ″ to select desired table data, it is possible to operate with an operation torque according to the shooting situation and the photographer's preference.

  In the third embodiment, the material of the transmission member 37 and the pressing force against the focus ring 10 are adjusted so that the transmission member 37 and the focus ring 10 are in surface contact. Therefore, when the user performs an abrupt operation (such as suddenly stopping the rotation), the contact surface between the transmission member 37 and the focus ring 10 slips, so that the force of the motor 36 is not excessively applied to the focus ring 10. It has become.

  In the third embodiment, the case where the rotation of the motor 36 is transmitted to the focus ring 10 has been described. However, the case where the rotation is transmitted to the zoom ring 12 or the iris ring 14 can be similarly performed. The rotation of the motor 36 may be transmitted to the cam cylinder 6 instead of these rings.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The execution order of each process such as operation, procedure, step, and stage in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that the output can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the specification, and the drawings, even if it is described using “first”, “next”, etc. for the sake of convenience, it means that it is essential to carry out in this order. It is not a thing.

  2 ... Lens device, 4 ... Lens barrel, 6 ... Cam barrel, 10 ... Focus ring, 12 ... Zoom ring, 14 ... Iris ring, 20 ... Drive unit, 21, 21 ', 21 "... Table data setting dial, 22 ... Actuator, 24 ... Suppression member, 26 ... Ring, 28, 29, 35 ... Gear, 30, 32, 34 ... Sensor, 36 ... Motor, 37 ... Transmission member, 40, 40 ', 40 "... CPU, 42, 42 ', 42 "... EEPROM

Claims (6)

A lens barrel, an operation ring arranged concentrically on the outer side of the lens barrel and capable of rotating operation, and arranged concentrically on the inner side of the lens barrel and rotated integrally with the operation ring. A lens device having a cam cylinder,
Storage means for storing in advance a relationship between a rotational speed of the operating ring or the cam cylinder and an operational torque target value corresponding to the rotational speed;
Detecting means for detecting an operation speed of the operation ring or the cam cylinder by a user;
Control target setting means for reading the operation torque target value from the storage means based on the detected operation speed and setting the operation torque target value;
Torque control means for changing the magnitude of auxiliary torque applied to the operation ring or the cam cylinder so that the operation torque of the operation ring or the cam cylinder becomes the set operation torque target value;
With
In the storage means, a relationship between an operation speed and an operation direction of the operation ring or the cam cylinder and an operation torque target value is stored in advance.
The detection means detects an operation speed and an operation direction of the operation ring or the cam cylinder by a user,
The control target setting means reads an operation torque target value from the storage means based on the detected operation speed and operation direction, sets an operation torque target value,
The torque control means changes the magnitude and direction of the auxiliary torque applied to the operation ring or the cam cylinder so that the operation torque of the operation ring or the cam cylinder becomes the set operation torque target value. ,
The torque control means includes a suppressing member that is pressed against the operation ring or the cam cylinder, and is a frictional force generated by pressing the suppressing member, and includes a bias force having a constant magnitude and a pressing force having a variable magnitude. A lens device that changes the direction and magnitude of the auxiliary torque by increasing or decreasing the frictional force due to the change by changing the magnitude of the variable pressing force . The storage means stores a plurality of relationships between the operation speed and operation direction of the operation ring or the cam cylinder and an operation torque target value,
A selection means for selecting a relationship used for setting the operation torque target value among the plurality of stored relationships;
The lens device according to claim 1.   3. The lens device according to claim 1, wherein the wear of the restraining member is higher than the wear of a portion of the operation ring or the cam cylinder against which the restraining member is pressed. A lens barrel, an operation ring arranged concentrically on the outer side of the lens barrel and capable of rotating operation, and arranged concentrically on the inner side of the lens barrel and rotated integrally with the operation ring. A lens device having a cam cylinder,
Storage means for storing in advance a relationship between a rotational speed of the operating ring or the cam cylinder and an operational torque target value corresponding to the rotational speed;
Detecting means for detecting an operation speed of the operation ring or the cam cylinder by a user;
Control target setting means for reading the operation torque target value from the storage means based on the detected operation speed and setting the operation torque target value;
Torque control means for changing the magnitude of auxiliary torque applied to the operation ring or the cam cylinder so that the operation torque of the operation ring or the cam cylinder becomes the set operation torque target value;
With
In the storage means, a relationship between an operation speed and an operation direction of the operation ring or the cam cylinder and an operation torque target value is stored in advance.
The detection means detects an operation speed and an operation direction of the operation ring or the cam cylinder by a user,
The control target setting means reads an operation torque target value from the storage means based on the detected operation speed and operation direction, sets an operation torque target value,
The torque control means changes the magnitude and direction of the auxiliary torque applied to the operation ring or the cam cylinder so that the operation torque of the operation ring or the cam cylinder becomes the set operation torque target value. ,
The torque control means includes a magnet disposed in the circumferential direction in one of the operation ring or the cam tube and the lens barrel, a coil disposed in the other and through which an electric current flows in the axial direction of the lens device, And the direction and magnitude of the induced electromotive force generated between the magnet and the coil are controlled by adjusting the direction and magnitude of the current flowing through the coil, and thereby the direction of the auxiliary torque and A lens device that changes its size. A lens barrel, an operation ring arranged concentrically on the outer side of the lens barrel and capable of rotating operation, and arranged concentrically on the inner side of the lens barrel and rotated integrally with the operation ring. A lens device having a cam cylinder,
Storage means for storing in advance a relationship between a rotational speed of the operating ring or the cam cylinder and an operational torque target value corresponding to the rotational speed;
Detecting means for detecting an operation speed of the operation ring or the cam cylinder by a user;
Control target setting means for reading the operation torque target value from the storage means based on the detected operation speed and setting the operation torque target value;
Torque control means for changing the magnitude of auxiliary torque applied to the operation ring or the cam cylinder so that the operation torque of the operation ring or the cam cylinder becomes the set operation torque target value;
With
In the storage means, a relationship between an operation speed and an operation direction of the operation ring or the cam cylinder and an operation torque target value is stored in advance.
The detection means detects an operation speed and an operation direction of the operation ring or the cam cylinder by a user,
The control target setting means reads an operation torque target value from the storage means based on the detected operation speed and operation direction, sets an operation torque target value,
The torque control means changes the magnitude and direction of the auxiliary torque applied to the operation ring or the cam cylinder so that the operation torque of the operation ring or the cam cylinder becomes the set operation torque target value. ,
The torque control means includes a motor and a cylindrical or disk-shaped rotating member that is attached to a rotating shaft of the motor and transmits torque generated by the motor to the operation ring or the cam cylinder.
The rotating member and the operation ring or the cam cylinder are in surface contact,
The lens device, wherein the torque control means changes a direction and a magnitude of the auxiliary torque by changing a rotation speed and a direction of the motor. The torque control means includes
When the detected rotational speed is equal to or greater than a first threshold value, the direction and magnitude of the auxiliary torque is changed to assist the rotation of the operation ring or the cam cylinder,
When the detected rotational speed is equal to or smaller than a second threshold value that is smaller than the first threshold value, the direction and magnitude of the auxiliary torque so as to suppress the rotation of the operation ring or the cam cylinder. Change
The lens device according to claim 4 or 5.

Images