JP2021173850A - Lens device and imaging apparatus - Google Patents

Abstract

To suppress decrease in detection accuracy of a potentiometer for detecting a rotation angle of an operation ring.SOLUTION: A lens device comprises: a resistor 251 provided in a circular arc shape on an outer peripheral surface of a cam ring; and a wiper 252 provided on a first ring and sliding on the resistor 251 while in contact with the resistor. The lens device may comprise a potentiometer 250 for detecting a rotation angle of the first ring with respect to the cam ring in accordance with the potential of the wiper 252. The lens device may comprise a circuit 230 configured to control a drive mechanism to move at least one lens of a plurality of lenses in an optical axis direction on the basis of a rotational position of a changeover ring to a first cylinder and the rotation angle of the first ring detected by the potentiometer 250.SELECTED DRAWING: Figure 18

Description

The present invention relates to a lens device and an imaging device.

Patent Document 1 describes, "Providing a lens barrel and a camera system capable of switching a mode state for focusing with a single operation of an operating member and adjusting focusing in the switched mode state." ing.
[Prior art literature]
[Patent Document]
[Patent Document 1] Japanese Unexamined Patent Publication No. 2013-7906

It is desired to suppress a decrease in detection accuracy of a potentiometer that detects the rotation angle of a ring such as an operation ring provided in a lens barrel or the like.

According to the lens device according to one aspect of the present invention, a first cylinder accommodating a plurality of lenses may be provided. The lens device may include a first ring that is rotatably arranged around the first cylinder about the optical axis. The lens device may include a second cylinder that holds the plurality of lenses and is arranged in the first cylinder so as to be movable together with the plurality of lenses between the first position and the second position in the optical axis direction. The lens device is rotatably arranged around the first cylinder around the optical axis, and has a cam groove that engages with a cam pin of the second cylinder through a groove along the optical axis direction of the first cylinder. It may be equipped with a cam ring. The lens device is rotatably arranged around the cam ring together with the cam ring around the optical axis, and rotates around the optical axis between the first rotation position and the second rotation position to move the second cylinder through the cam ring. A switching ring that accepts an operation of switching between the first position and the second position may be provided. The lens device includes a resistor provided on the outer peripheral surface of the cam ring in an arc shape and a wiper provided on the first ring and slides on the resistor while in contact with the resistor. A potentiometer for detecting the rotation angle of the first ring may be provided. The lens device is driven to move at least one of the plurality of lenses in the optical axis direction based on the rotation position of the switching ring with respect to the first cylinder and the rotation angle of the first ring detected by the potentiometer. A circuit configured to control the mechanism may be provided.

The lens device may include a circuit board that is electrically connected to the circuit. The potentiometer may include a flexible printed circuit board, one end of which is electrically connected to one end of the resistor and the other end of which is electrically connected to a circuit board.

The first ring may be a display ring that displays an index according to the rotation angle with respect to the first cylinder.

The arc length of the resistor may be shorter than the arc length of the area where the index of the display ring is displayed.

The lens device may be rotatably arranged around the first cylinder around the optical axis and may include an operation ring that accepts an operation of moving at least one of the plurality of lenses in the optical axis direction. The display ring is movably arranged between the third position and the fourth position in the optical axis direction together with the operation ring, and when it is in the third position, it rotates around the optical axis together with the operation ring as the operation ring rotates. , When it is in the fourth position, it does not have to rotate around the optical axis together with the operation ring as the operation ring rotates. The circuit is out of a plurality of lenses based on the rotation position of the switching ring with respect to the first cylinder and the rotation angle of the display ring with respect to the cam ring detected by the potentiometer when the operation ring and the display ring are in the third position. When at least one lens is moved in the optical axis direction and the operation ring and the display ring are in the fourth position, at least one of the plurality of lenses is moved to the optical axis based on the amount and direction of rotation of the operation ring. It may be configured to control the drive mechanism to move in a direction.

The lens device is arranged between the respective surfaces of the operation ring and the display ring facing each other, and when the operation ring and the display ring are in the third position, the display ring is rotated together with the operation ring as the operation ring is rotated. A friction member that generates a frictional force to be generated in the display ring may be provided. When the operation ring and the display ring are in the fourth position, the lens device may include a resistance member that generates a resistance force on the display ring that prevents the display ring from rotating together with the operation ring as the operation ring rotates. ..

The resistance member is a first engaging member fixed to the display ring and a second engaging member fixed to the cam ring and engaged with the first engaging member when the operation ring and the display ring are in the fourth position. And may have.

The first engaging member may have a plurality of first convex portions. The second engaging member may have a plurality of second convex portions that engage with the plurality of first convex portions.

The display ring may cover a part of the outer peripheral surface of the operation ring. The friction member may be arranged between a part of the outer peripheral surface of the operation ring and a part of the inner peripheral surface of the display ring facing a part of the outer peripheral surface of the operation ring.

The lens device may be arranged around the first cylinder and may include a cover ring that covers the outer peripheral surface for displaying the index of the display ring when the operation ring and the display ring are in the second position.

According to one aspect of the present invention, the lens device and an image sensor that captures an image formed through a plurality of lenses may be provided.

According to one aspect of the present invention, it is possible to prevent a decrease in detection accuracy of the potentiometer.

The outline of the above invention does not list all the necessary features of the present invention. Sub-combinations of these feature groups can also be inventions.

It is external perspective view of the image pickup apparatus which concerns on this embodiment. It is a figure which shows an example of the functional block diagram of the image pickup apparatus which concerns on this embodiment. It is a figure which shows the side view of the lens part set in a full-time MF mode. It is a figure which shows the side view of the lens part set in the distance scale MF mode. FIG. 5 is a cross-sectional perspective view of a lens portion in a state where the operation ring and the display ring are moved to the image plane side position in the optical axis direction. FIG. 5 is a cross-sectional perspective view of a lens portion in a state where the operation ring and the display ring are moved to a position on the subject side in the optical axis direction. FIG. 5 is an enlarged cross-sectional perspective view of a portion including a friction member and a resistance member when the operation ring and the display ring are located at the image plane side position. FIG. 5 is an enlarged cross-sectional perspective view of a portion including a friction member and a resistance member when the operation ring and the display ring are located at the position on the subject side. It is a figure which shows the positional relationship of the rotation regulation part in a normal shooting mode. It is a figure which shows the positional relationship of the rotation regulation part in a normal shooting mode. It is a figure which shows the positional relationship of the rotation regulation part in a normal shooting mode. It is a figure which shows the positional relationship of the rotation regulation part in the macro photography mode. It is a figure which shows the positional relationship of the rotation regulation part in the macro photography mode. It is a figure which shows the positional relationship of the rotation regulation part in the macro photography mode. It is a figure which shows the positional relationship of the potentiometer in the normal shooting mode. It is a figure which shows the positional relationship of the potentiometer in the normal shooting mode. It is a figure which shows the positional relationship of the potentiometer in the normal shooting mode. It is a figure which shows the positional relationship of the potentiometer in the normal shooting mode. It is a figure which shows the positional relationship of the potentiometer in the macro photography mode. It is a figure which shows the positional relationship of the potentiometer in the macro photography mode. It is a figure which shows the positional relationship of the potentiometer in the macro photography mode. It is a figure which shows the positional relationship of the potentiometer in the macro photography mode. It is a figure for demonstrating the relationship between the arc length of a resistor and the arc length of the area of the distance scale of a display ring. It is a figure for demonstrating the relationship between the arc length of a resistor and the arc length of the area of the distance scale of a display ring.

Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. Also, not all combinations of features described in the embodiments are essential to the means of solving the invention. It will be apparent to those skilled in the art that various changes or improvements can be made to the following embodiments. It is clear from the description of the claims that such modified or improved forms may also be included in the technical scope of the present invention.

The claims, description, drawings, and abstracts include matters that are subject to copyright protection. The copyright holder will not object to any person's reproduction of these documents as long as they appear in the Patent Office files or records. However, in other cases, all copyrights are reserved.

FIG. 1 is a diagram showing an example of an external perspective view of the image pickup apparatus 100 according to the present embodiment. FIG. 2 shows an example of a functional block diagram of the image pickup apparatus 100 according to the present embodiment. The image pickup apparatus 100 includes an image pickup section 102 and a lens section 200. The image pickup unit 102 includes an image sensor 120, an image pickup control unit 110, and a memory 130. The image sensor 120 may be composed of a CCD or CMOS. The image sensor 120 captures an image formed through the lens. The image sensor 120 outputs the image data of the optical image formed through the lens to the image pickup control unit 110. The image pickup control unit 110 may be composed of a CPU, a microprocessor such as an MPU, a microcontroller such as an MCU, or the like. The memory 130 may be a computer-readable recording medium and may include at least one of flash memories such as SRAM, DRAM, EPROM, EEPROM, and USB memory. The memory 130 stores a program or the like necessary for the image pickup control unit 110 to control the image sensor 120 or the like. The memory 130 may be provided inside the housing of the image pickup apparatus 100. The memory 130 may be provided so as to be removable from the housing of the image pickup apparatus 100.

The imaging unit 102 may further include an indicator unit 162 and a display unit 160. The instruction unit 162 is a user interface that receives an instruction to the image pickup apparatus 100 from the user. The display unit 160 displays an image captured by the image sensor 120, various setting information of the image pickup device 100, and the like. The display unit 160 may be composed of a touch panel.

The lens unit 200 has a first lens group 211, a second lens group 212, a third lens group 213, and a fourth lens group 214. The lens unit 200 includes a light amount control mechanism 215, a drive mechanism 270, and a lens control unit 280. The first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214 may function as a single focus lens. The first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214 are arranged so as to be movable along the optical axis. The lens unit 200 may be an interchangeable lens that is detachably provided with respect to the image pickup unit 102. The drive mechanism 270 moves at least one of the second lens group 212 and the third lens group 213 along the optical axis. The drive mechanism 270 may move the first lens group 211 or the fourth lens group 214 along the optical axis. The lens control unit 280 drives the drive mechanism 270 according to the lens control command from the image pickup unit 102 to move the second lens group 212 and the third lens group 213 along the optical axis direction. The lens control command is, for example, a focus control command. The drive mechanism 270 may have a motor, a cam ring driven by the motor, and a moving frame that moves in the optical axis direction together with the lens as the cam ring rotates. The electric motor may be a stepping motor, a DC motor, a coreless motor, or an ultrasonic motor.

The lens unit 200 further has a memory 290. The memory 290 stores the control value of the drive mechanism 270 and the lens moving via the drive mechanism 270. The memory 290 may include at least one of flash memories such as SRAM, DRAM, EPROM, EEPROM, and USB memory.

The light amount control mechanism 215 controls the amount of light incident on the image sensor 120. The light amount control mechanism 215 has at least one of a diaphragm mechanism and a shutter mechanism. The light amount control mechanism 215 may include a plurality of diaphragm blades. The light amount control mechanism 215 may include an actuator. The actuator may be an electromagnetic actuator. The electromagnetic actuator may be an electromagnet, a solenoid, or a stepping motor. The light amount control mechanism 215 may receive a command from the lens control unit 280 to drive an actuator to adjust the degree of overlap of the plurality of diaphragm blades and adjust the size of the aperture diameter.

In the image pickup apparatus 100 configured as described above, the lens unit 200 may be a single focus lens capable of switching to a plurality of shooting modes. There are multiple shooting modes: full-time MF mode, which executes focusing control with autofocus (AF) and then focus control with manual focus (MF), and manual focus control using the distance scale. Includes a distance scale MF mode to execute. The distance scale MF mode includes a mode in which the distance to the subject to be focused is in the first distance range and a mode in which the distance to the subject to be focused is shorter than the distance in the first distance range in the second distance range. .. More specifically, in the distance scale MF mode, the normal shooting mode in the first distance range including the distance to the subject from infinity to the first distance (for example, 0.5 m) and the distance to the subject are the first distance. It includes a macro shooting mode in a second distance range including from (for example, 0.5 m) to a second distance (for example, 0.3 m) shorter than the first distance.

FIG. 3 shows a side view of the lens unit 200 set to the full-time MF mode. FIG. 4 shows a side view of the lens unit 200 set to the distance scale MF mode.

The lens unit 200 includes an operation ring 201, a display ring 202, a switching ring 203, and a function ring 206 that can rotate around the optical axis. The lens unit 200 further includes a covering 204 that does not rotate about the optical axis. The operation ring 201 accepts an operation of moving at least one of the second lens group 212 and the third lens group 213 in the optical axis direction to execute focusing control. The display ring 202 displays a distance scale indicating the distance to the subject to be focused as an index according to the rotation angle around the optical axis. The operation ring 201 and the display ring 202 are movable in the optical axis direction.

FIG. 3 shows a state in which the operation ring 201 and the display ring 202 are moved to the image plane side position in the optical axis direction. FIG. 4 shows a state in which the operation ring 201 and the display ring 202 are moved to the subject side position in the optical axis direction. When the operation ring 201 and the display ring 202 are located on the image plane side in the optical axis direction, the cover ring 204 covers the area indicating the distance scale of the display ring 202. When the operation ring 201 and the display ring 202 are located on the subject side in the optical axis direction, the region showing the distance scale of the display ring 202 is exposed without being covered by the cover ring 204.

When the operation ring 201 and the display ring 202 are located on the image plane side in the optical axis direction, the lens unit 200 is set to the full-time MF mode. When the operation ring 201 and the display ring 202 are located on the subject side in the optical axis direction, the lens unit 200 is set to the distance scale MF mode.

The function ring 206 accepts an operation of switching the setting of various shooting conditions of the image pickup apparatus 100. For example, the function ring 206 accepts an operation of switching the F value or the shutter speed. The shooting conditions to be switched may be selected in advance by the user.

FIG. 5 is a cross-sectional perspective view of the lens unit 200 in a state where the operation ring 201 and the display ring 202 are moved to the image plane side position in the optical axis direction. FIG. 6 is a cross-sectional perspective view of the lens unit 200 in a state where the operation ring 201 and the display ring 202 are moved to the subject side position in the optical axis direction.

The lens unit 200 includes a fixed cylinder 220 that accommodates the first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214. The fixed cylinder 220 is an example of the first cylinder. The operation ring 201 is rotatably arranged around the fixed cylinder 220 around the optical axis. The operation ring 201 receives the focus adjustment operation from the user. The operation ring 201 accepts an operation of moving at least one of the second lens group 212 and the third lens group 213 in the optical axis direction. The display ring 202 is rotatably arranged around the fixed cylinder 220 around the optical axis, and is movably arranged together with the operation ring 201 between the subject side position and the image plane side position in the optical axis direction. The lens unit 200 further includes a circuit board 230 so as to surround the outer periphery of the fourth lens group 214.

The lens unit 200 further includes a friction member 207. The friction member 207 is arranged between the surfaces of the operation ring 201 and the display ring 202 facing each other, and when the operation ring 201 and the display ring 202 are located on the subject side, the friction member 207 is operated as the operation ring 201 rotates. A frictional force that rotates the display ring 202 together with the ring 201 is generated in the display ring 202.

The lens unit 200 further includes a resistance member 210. When the operation ring 201 and the display ring 202 are located on the image plane side, the resistance member 210 gives the display ring 202 a resistance force that prevents the display ring 202 from rotating together with the operation ring 201 as the operation ring 201 rotates. generate. When the operation ring 201 and the display ring 202 are located on the image plane side, the resistance member 210 is a display ring so that the display ring 202 does not rotate due to the frictional force of the friction member 207 in response to the rotation of the operation ring 201. Holds 202.

The lens unit 200 further includes a straight cylinder 222 and a cam ring 224. The straight cylinder 222 holds the first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214. The straight-ahead cylinder 222 has a normal shooting position in which the shootable distance range is set to the first distance range (for example, a range of 0.5 m from infinity) and a second distance range (for example, 0.5 m) in which the shootable distance range is set. Can be moved together with the first lens group 211, the second lens group 212, the third lens group 213, and the fourth lens group 214 in the optical axis direction from the macro shooting position set to (from 0.3 m). , Arranged in the fixed cylinder 220.

The cam ring 224 is rotatably arranged around the fixed cylinder 220 around the optical axis, and is a cam that engages with the cam pin 225 of the straight cylinder 222 through a straight groove 2201 along the optical axis direction of the fixed cylinder 220. It has a groove 2241 (shown in FIG. 6).

The switching ring 203 is rotatably arranged around the cam ring 224 together with the cam ring 224 around the optical axis. The switching ring 203 accepts an operation of switching the straight cylinder 222 between the normal shooting position and the macro shooting position via the cam ring 224.

As the switching ring 203 rotates about the optical axis, the cam ring 224 rotates about the optical axis. By rotating the cam ring 224, the cam pin 225 is guided by the straight groove 2201 and the cam groove 2241, and the straight cylinder 222 moves between the normal shooting position and the macro shooting position in the optical axis direction.

FIG. 7 is an enlarged cross-sectional perspective view of a portion including the friction member 207 and the resistance member 210 when the operation ring 201 and the display ring 202 are located at the image plane side positions. FIG. 8 is an enlarged cross-sectional perspective view of a portion including the friction member 207 and the resistance member 210 when the operation ring 201 and the display ring 202 are located at the subject side positions.

The display ring 202 covers a part of the outer peripheral surface of the operation ring 201. The friction member 207 is arranged between a part of the outer peripheral surface of the operation ring 201 and a part of the inner peripheral surface of the display ring 202 facing a part of the outer peripheral surface of the operation ring 201. The display ring 202 may be pressed against the operation ring 201 side in the optical axis direction by the leaf spring 2021. The leaf spring 2021 may press a protruding portion protruding from the inner peripheral surface of the display ring 202 in the optical axis direction toward the operation ring 201.

The friction member 207 may be adhered to a part of the outer peripheral surface of the operation ring 201 with an adhesive. The friction member 207 may be suede-like artificial leather. The friction member 207 may be, for example, Ultrasuede® or Exaine®.

The resistance member 210 is held by the first engaging member 208 fixed to the display ring 202 and the fixing cylinder 220, and when the operation ring 201 and the display ring 202 are in the image plane side position, the first engaging member 208 It has a second engaging member 209 that engages with. The first engaging member 208 has a plurality of first convex portions. The plurality of first convex portions are arranged on the image plane side surface of the display ring 202 at equal intervals.

The second engaging member 209 is held by the fixed cylinder 220 by being fixed to the cam ring 224, and engages with the first engaging member 208 when the operation ring 201 and the display ring 202 are in the image plane side position. .. The second engaging member 209 has a plurality of second convex portions that engage with the plurality of first convex portions when the operation ring 201 and the display ring 202 are located at the image plane side positions. The plurality of second convex portions are arranged at equal intervals on the outer peripheral surface of the cam ring 224.

When the operation ring 201 and the display ring 202 are located on the subject side, the lens control unit 280 determines at least one of the second lens group 212 and the third lens group 213 based on the rotation angle of the display ring 202 with respect to the fixed cylinder 220. The drive mechanism 270 is controlled so as to move the lens in the optical axis direction, and focusing control is executed. When the operation ring 201 and the display ring 202 are located on the image plane side, the lens control unit 280 determines at least one of the second lens group 212 and the third lens group 213 based on the rotation amount and rotation direction of the operation ring 201. Is configured to control the drive mechanism 270 so as to move the lens in the optical axis direction.

According to the lens unit 200 configured in this way, in the case of the distance scale MF mode, that is, when the operation ring 201 and the display ring 202 are located on the subject side, the display ring 202 is caused by the frictional force of the friction member 207. It rotates with the rotation of the operation ring 201. On the other hand, in the case of the full-time MF mode, that is, when the operation ring 201 and the display ring 202 are located on the image plane side, the first engaging member 208 fixed to the display ring 202 and the second engaging member fixed to the cam ring 224 are fixed. Engage with the engaging member 209. As a result, the operation ring 201 is operated with an operation torque that exceeds the frictional force of the friction member 207, so that the operation ring 201 can rotate without rotating the display ring 202. Therefore, the display ring 202 can maintain the shooting distance set in the distance scale MF mode even when the distance scale MF mode is switched to the full-time MF mode.

Further, the rotation angle range in which the display ring 202 can be rotated in the distance scale MF mode is physically limited to the rotation angle range corresponding to the distance scale. That is, the display ring 202 cannot rotate beyond a predetermined rotation angle range. Here, in the distance scale MF mode, the user may try to rotate the operation ring 201 beyond a predetermined rotation angle range of the display ring 202. However, the display ring 202 is only rotated together with the operation ring 201 by the frictional force of the friction member 207. Therefore, if the operation ring 201 is to be rotated beyond a predetermined rotation angle range of the display ring 202 and an operation torque exceeding the frictional force of the friction member 207 is generated in the operation ring 201, the operation ring 201 is generated. Only rotates. As a result, when the operation ring 201 is to be rotated beyond the predetermined rotation angle range of the display ring 202, the first engaging member 208 of the display ring 202 and the second engaging member 209 of the cam ring 224 are used. The load generated in can be reduced. Therefore, the first engaging member 208 and the second engaging member 209 do not need to have a strong rigidity, and the first convex portion and the second convex portion can be arranged at a fine pitch. As a result, when switching from the distance scale MF mode to the full-time MF mode, the display ring 202 is prevented from rotating and shifting due to the engagement between the first engaging member 208 and the second engaging member 209. be able to.

A structure in which the rotation angle range in which the display ring 202 can rotate in the distance scale MF mode is physically limited to the rotation angle range with respect to the distance scale will be further described.

9, 10, and 11 show the positional relationship of the rotation regulating unit 240 in the normal shooting mode. 12, 13, and 14 show the positional relationship of the rotation regulating unit 240 in the macro shooting mode. The rotation control unit 240 limits the rotation of the display ring 202 to the first rotation angle range 244 when the straight cylinder 222 is in the normal shooting position. The rotation control unit 240 limits the rotation of the display ring 202 to the second rotation angle range 245 when the straight cylinder 222 is in the macro shooting position.

The rotation regulation unit 240 has a first regulation unit 241 provided on the cam ring 224 and second regulation units 2421 and 2422 provided on the display ring 202. By restricting the second regulation units 2421 and 2422 by the first regulation unit 241, the rotation of the display ring 202 is limited to the first rotation angle range 244 or the second rotation angle range 245.

The first regulation unit 241 is provided on the outer peripheral surface of the cam ring 224. The first regulating portion 241 may be a pin protruding from the outer peripheral surface of the cam ring 224. The second regulating portions 2421 and 2422 may be convex portions or concave portions provided on the image plane side surface of the display ring 202. The second regulation unit 2421 contacts the first regulation unit 241 at one boundary of the first rotation angle range 244 or one boundary of the second rotation angle range 245 to limit the rotation of the display ring 202. The second restricting unit 2422 contacts the first restricting unit 241 at the other boundary of the first rotation angle range 244 or the other boundary of the second rotation angle range 245 to limit the rotation of the display ring 202.

The first regulation unit 241 is fixed to the cam ring 224. The cam ring 224 rotates together with the switching ring 203 as the switching ring 203 rotates by switching between the normal shooting mode and the macro shooting mode. Therefore, the position of the first regulation unit 241 changes with respect to the fixed cylinder 220 in the normal shooting mode and the macro shooting mode. Therefore, the position of the rotation angle range that limits the rotation of the display ring 202 changes between the normal shooting mode and the macro shooting mode.

A rotation control unit 240 is provided on the cam ring 224 and the display ring 202. As a result, even in the full-time MF mode, when the switching ring 203 is rotated, the cam ring 224 is rotated to switch between the normal shooting mode and the macro shooting mode. That is, the straight-ahead cylinder 222 is switched between the normal shooting position and the macro shooting position. Moreover, the position of the first regulation unit 241 changes according to the rotation of the cam ring 224, and the rotation angle range of the display ring 202 is switched between the first rotation angle range 244 and the second rotation angle range 245.

The lens unit 200 includes a photo interrupter for detecting the amount of rotation and the direction of rotation of the operation ring 201. Further, the lens unit 200 further includes a potentiometer for detecting the rotation angle of the display ring 202. In the full-time MF mode, the lens control unit 280 makes at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotation amount and rotation direction of the operation ring 201 detected by the photo interrupter. The drive mechanism 270 is controlled so as to move the lens to, and the focusing control is executed. In the distance scale MF mode, the lens control unit 280 moves at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotation angle of the display ring 202 with respect to the fixed cylinder 220. The drive mechanism 270 is controlled to perform focusing control.

15, FIG. 16, FIG. 17, and FIG. 18 show the positional relationship of the potentiometer 250 in the normal shooting mode. 19, FIG. 20, FIG. 21, and FIG. 22 show the positional relationship of the potentiometer 250 in the macro photography mode.

The potentiometer 250 includes a resistor 251 and a wiper 252. The resistor 251 is provided on the outer peripheral surface of the cam ring 224 in an arc shape. The wiper 252 is provided on the display ring 202 and slides on the resistor 251 while being in contact with the resistor 251. The potentiometer 250 detects the rotation angle of the display ring 202 with respect to the cam ring 224 according to the potential of the wiper 252.

The potentiometer 250 further includes a flexible printed substrate 253. One end of the flexible printed circuit board 253 is electrically connected to one end of the resistor 251. The other end of the flexible printed circuit board 253 is electrically connected to the circuit board 230. Since the resistor 251 is electrically connected to the circuit board 230 by the flexible printed circuit board 253, the resistor 251 can rotate around the optical axis together with the cam ring 224 in a state of being electrically connected to the circuit board 230.

The resistor 251 moves with respect to the fixed cylinder 220 according to the rotation of the cam ring 224. In the normal shooting mode, the potentiometer 250 may detect the rotation angle of the display ring 202 with respect to the cam ring 224 in the first rotation angle range 244 in which the display ring 202 rotates. On the other hand, in the macro photography mode, the potentiometer 250 only needs to be able to detect the rotation angle of the display ring 202 with respect to the cam ring 224 in the second rotation angle range 245 in which the display ring 202 rotates. Therefore, the arc length of the resistor 251 may be shorter than the arc length of the region where the distance scale, which is an index of the display ring 202, is displayed.

As shown in FIG. 23, the arc length of the resistor 251 may be longer than the arc length of the distance scale area of the display ring 202, or may be the same as the arc length of the distance scale area of the display ring 202. Conceivable. However, if the arc length of the resistor 251 becomes long, the detection accuracy may decrease due to the relationship between the voltage that can be applied to the resistor 251 and noise. On the other hand, as shown in FIG. 24, according to the present embodiment, the resistor 251 moves with respect to the distance scale region of the display ring 202 in the normal shooting mode and the macro shooting mode. Therefore, the arc length of the resistor 251 may be shorter than the arc length of the region where the distance scale, which is an index of the display ring 202, is displayed. Since the arc length of the resistor 251 is shortened, it is possible to prevent a decrease in detection accuracy.

The size of the first rotation angle range 244 in which the display ring 202 can rotate in the normal shooting mode and the size of the second rotation angle range 245 in which the display ring 202 can rotate in the macro shooting mode are the same. Therefore, the arc length of the resistor 251 may be half the arc length of the region where the distance scale, which is an index of the display ring 202, is displayed.

Since the resistor 251 moves with respect to the fixed cylinder 220, the lens control unit 280 cannot specify the rotation angle of the display ring 202 with respect to the fixed cylinder 220 only from the detection result of the potentiometer 250. Therefore, the lens control unit 280 at least the second lens group 212 and the third lens group 213 based on the rotation position of the switching ring 203 with respect to the fixed cylinder 220 and the rotation angle of the display ring 202 detected by the potentiometer 250. Focusing control is executed by controlling the drive mechanism 270 so as to move one of them in the optical axis direction.

The lens unit 200 includes a photo interrupter that detects the rotation of the switching ring 203. Based on the detection result of the photo interrupter, the lens control unit 280 determines whether the switching ring 203 is in the rotation position corresponding to the normal shooting mode or the rotation position corresponding to the macro shooting mode. The lens control unit 280 determines whether the switching ring 203 is in the rotation position corresponding to the normal shooting mode or the rotation position corresponding to the macro shooting mode, and the rotation angle of the display ring 202 detected by the potentiometer 250. Based on the above, the rotation angle of the display ring 202 with respect to the fixed cylinder 220 may be specified. The lens control unit 280 sets the drive mechanism 270 so as to move at least one of the second lens group 212 and the third lens group 213 in the optical axis direction based on the rotation angle of the specified display ring 202 with respect to the fixed cylinder 220. You may control and perform focusing control.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various changes or improvements can be made to the above embodiments. It is clear from the description of the claims that such modified or improved forms may also be included in the technical scope of the present invention.

The order of execution of operations, procedures, steps, steps, etc. in the devices, systems, programs, and methods shown in the claims, specification, and drawings is particularly "before" and "prior to". It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Even if the scope of claims, the specification, and the operation flow in the drawings are explained using "first", "next", etc. for convenience, it means that it is essential to carry out in this order. It's not a thing.

100 Imaging device 102 Imaging unit 110 Imaging control unit 120 Image sensor 130 Memory 160 Display unit 162 Indicator unit 200 Lens unit 201 Operation ring 202 Display ring 203 Switching ring 204 Covering 206 Function ring 207 Friction member 208 First engaging member 209 2 Engagement member 210 Resistance member 211 1st lens group 212 2nd lens group 213 3rd lens group 214 4th lens group 215 Light amount control mechanism 220 Fixed cylinder 222 Straight cylinder 224 Cam ring 225 Cam pin 230 Circuit board 240 Rotation control unit 241 1 Regulator 244 1st rotation angle range 245 2nd rotation angle range 250 Potentiometer 251 Resistor 252 Wipe 253 Flexible printed circuit board 270 Drive mechanism 280 Lens control unit 290 Memory 2021 Leaf spring 2201 Straight groove 2241 Cam groove 2421, 2422 2nd regulation Department

Claims (11)

The first cylinder that accommodates multiple lenses and
A first ring that is rotatably arranged around the optical axis and is arranged around the first cylinder.
A second cylinder that holds the plurality of lenses and is arranged in the first cylinder so as to be movable together with the plurality of lenses between the first position and the second position in the optical axis direction.
A cam ring rotatably arranged around the first cylinder and having a cam groove that engages with a cam pin of the second cylinder through a groove along the optical axis direction of the first cylinder. When,
The second cylinder is rotatably arranged around the optical axis together with the cam ring, and rotates around the optical axis between the first rotation position and the second rotation position to cause the second cylinder to rotate through the cam ring. A switching ring that accepts an operation to switch between the first position and the second position,
A resistor provided on the outer peripheral surface of the cam ring in an arc shape and a wiper provided on the first ring and sliding on the resistor while in contact with the resistor are included, and the wiper is provided according to the potential of the wiper. A potentiometer that detects the rotation angle of the first ring with respect to the cam ring, and
At least one of the plurality of lenses is moved in the optical axis direction based on the rotation position of the switching ring with respect to the first cylinder and the rotation angle of the first ring detected by the potentiometer. A lens device including a circuit configured to control a drive mechanism. Further provided with a circuit board electrically connected to the circuit
The lens apparatus according to claim 1, wherein the potentiometer further includes a flexible printed circuit board in which one end is electrically connected to one end of the resistor and the other end is electrically connected to the circuit board. The lens device according to claim 1, wherein the first ring is a display ring that displays an index according to a rotation angle with respect to the first cylinder. The lens device according to claim 3, wherein the arc length of the resistor is shorter than the arc length of the region where the index of the display ring is displayed. Further provided with an operation ring rotatably arranged around the first cylinder around the optical axis and accepting an operation of moving at least one of the plurality of lenses in the optical axis direction.
The display ring is movably arranged between the third position and the fourth position in the optical axis direction together with the operation ring, and when the display ring is in the third position, the light is emitted together with the operation ring as the operation ring rotates. When it rotates around the axis and is in the fourth position, it does not rotate around the optical axis together with the operation ring due to the rotation of the operation ring.
In the circuit, when the operation ring and the display ring are in the third position, the rotation position of the switching ring with respect to the first cylinder and the rotation angle of the display ring with respect to the cam ring detected by the potentiometer. When at least one of the plurality of lenses is moved in the optical axis direction and the operation ring and the display ring are in the fourth position, the rotation amount and rotation direction of the operation ring are based on the above. The lens device according to claim 3, wherein the drive mechanism is controlled so as to move at least one of the plurality of lenses in the optical axis direction. When the operation ring and the display ring are arranged between the respective surfaces facing each other and the operation ring and the display ring are in the third position, the operation ring and the operation ring are rotated as the operation ring is rotated. A friction member that generates a frictional force that rotates the display ring on the display ring,
When the operation ring and the display ring are in the fourth position, a resistance member that generates a resistance force in the display ring that prevents the display ring from rotating together with the operation ring as the operation ring rotates. The lens device according to claim 5, further comprising. The resistance member engages with the first engaging member fixed to the display ring and the first engaging member fixed to the cam ring when the operation ring and the display ring are in the fourth position. The lens device according to claim 6, further comprising a matching second engaging member. 7. The first engaging member has a plurality of first convex portions, and the second engaging member has a plurality of second convex portions that engage with the plurality of first convex portions, according to claim 7. The lens device described. The display ring covers a part of the outer peripheral surface of the operation ring.
A claim that the friction member is arranged between the part of the outer peripheral surface of the operation ring and a part of the inner peripheral surface of the display ring facing the part of the outer peripheral surface of the operation ring. 6. The lens device according to 6. 5. A cover ring that is arranged around the first cylinder and covers an outer peripheral surface of the display ring that displays the index when the operation ring and the display ring are in the second position. The lens device described in. The lens device according to any one of claims 1 to 10.
An imaging device including an image sensor that captures an image formed through the plurality of lenses.

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