JPWO2019064945A1 - Lens barrel and imaging device - Google Patents

Abstract

Provided is a lightweight lens barrel equipped with two focus lenses. The lens barrel 2 has a first lens holding frame 50 for holding the first lens L5, a first driving unit STM5 for moving the first lens holding frame 50 in the optical axis direction, and a first lens holding frame 50 for the optical axis. A first guide bar 151 that guides in the direction, a second guide bar 152 that regulates the rotation of the first lens holding frame 50, a second lens holding frame 60 that holds the second lens L6, and a second lens holding frame 60. The second drive unit STM6 that moves the lens in the optical axis direction, the third guide bar 161 that guides the second lens holding frame 60 in the optical axis direction, and the fourth guide bar 162 that regulates the rotation of the second lens holding frame 60. The first drive unit STM5 is arranged closer to the first guide bar 151 than the second guide bar 152 in the circumferential direction centered on the optical axis, and the second drive unit STM6 is centered on the optical axis. It is arranged closer to the second guide bar 152 than the fourth guide bar 162 in the circumferential direction.

Description

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

Conventionally, various methods have been proposed in which a focus lens is provided and a stepping motor is used as a drive mechanism of the focus lens (see, for example, Patent Document 1).
However, the stepping motor of Patent Document 1 cannot move a heavy focus lens in the optical axis direction because the driving force is small.

JP-A-2015-49334

The lens barrel of the present invention has a first lens holding frame for holding the first lens, a first driving unit for moving the first lens holding frame in the optical axis direction, and the first lens holding frame in the optical axis direction. The first guide bar that guides the lens, the second guide bar that regulates the rotation of the first lens holding frame, the second lens holding frame that holds the second lens, and the second lens holding frame in the optical axis direction. A second drive unit to be moved, a third guide bar for guiding the second lens holding frame in the optical axis direction, and a fourth guide bar for restricting the rotation of the second lens holding frame are provided. The drive unit is arranged closer to the first guide bar than the second guide bar in the circumferential direction centered on the optical axis, and the second drive unit is the fourth guide in the circumferential direction centered on the optical axis. It is configured to be arranged closer to the second guide bar than the bar.
Further, the image pickup apparatus of the present invention is configured to include the lens barrel.

It is a conceptual diagram of the camera 1 configured by mounting the lens barrel which is the embodiment of this invention on a camera body. It is a partial cross-sectional view of a lens barrel. It is the figure which saw a part of the focus ring from the inner diameter side. It is the figure which looked at a part of the outer fixed cylinder from the outer diameter side. It is a side view of the motor sliding cylinder and the part on the inner diameter side from the motor sliding cylinder. It is a perspective view which shows the 5th group lens drive unit. It is a perspective view which shows the part of the moving rack shown in FIG. It is a radial sectional view of the internal fixation cylinder, the motor sliding cylinder, the 5th group cylinder, the 6th group cylinder, and STM5, STM6 seen from the rear side. It is a figure explaining the position of the main guide bar in the optical axis OA direction. It is a figure explaining the engagement length between the main guide bar engaging portion and the main guide bar of the 5 group cylinder, and the engagement length between the main guide bar engaging portion and the main guide bar of the 6 group cylinder. It is a figure which shows the positional relationship between the 5th group frame and the 6th group frame when the focal length is on the telephoto side and the subject distance is on the infinite side. It is a figure which shows the positional relationship between the 5th group frame 50 and the 6th group frame when the focal length is a wide angle side and the subject distance is a close side. Similar to FIG. 12, it is a diagram showing the positional relationship between the 5th group frame and the 6th group frame in the close vicinity of the wide, and the 5th group holding part of the 5th group frame and the 6th group hood part of the 6th group frame are close to each other. Indicates the state of It is a cross-sectional view of a part of the lens barrel, and is in a state where the 4-group lens and the 5-group lens are close to each other. It is a partially enlarged view of the 4th group lens and the 5th group hood part, and shows the state which the 5th group hood part does not cover the 4th group frame holding part. It is a flowchart explaining the initial operation of the control part of a lens barrel. It is a figure explaining the position on the optical axis of the photo interrupter for 5 groups, and the position of the photo interrupter for 6 groups.

FIG. 1 is a conceptual diagram of a camera 1 configured by mounting a lens barrel 2 according to an embodiment of the present invention on a camera body 3. In the following description, the subject side of the lens barrel 2 in the optical axis OA direction is the front side, and the camera body 3 side is the rear side. The movement of the lens barrel 2 in the optical axis OA direction is called "straight movement", and the rotation around the optical axis OA is called "rotation". Further, in the radial direction orthogonal to the optical axis OA of the lens barrel 2, the side away from the optical axis OA is referred to as the outer diameter side, and the side closer to the optical axis OA is referred to as the inner diameter side.

The camera 1 includes a camera body 3 and a lens barrel 2. The lens barrel 2 is provided with a lens mount LM at the rear portion (base end portion), and is detachably attached to the camera body 3 by engaging with the body mount BM of the camera body 3.

The camera body 3 is a so-called digital single-lens reflex camera that includes an image pickup element 4 that converts an optical image into an electric signal, processes the image pickup data by the image pickup element 4, and records it in a recording unit (not shown). It is not limited to digital single-lens reflex cameras. It may be a mirrorless camera or a compact digital camera. It may also be a twin-lens camera. It may be a camera built into a smartphone or tablet.
The camera body 3 is provided with a power switch (not shown). The ON / OFF signal of the power switch and the signal indicating the focusing and the aperture value are sent to the control unit 90 of the lens barrel 2 described later.

(1. Outline of lens barrel 2)
The lens barrel 2 includes a 1-group lens L1, a 2-group lens L2, a 3-group lens L3, a 4-group lens L4, a 5-group lens L5, a 6-group lens L6, and a 7-group lens L7 from the front side, and the focal length is changed. It is a possible so-called zoom lens. The lens is not limited to a zoom lens, and may be a single focus lens whose focal length cannot be changed.

(1-1. Lenses L1 to L7 in each group)
The 1st group lens L1, the 2nd group lens L2, the 3rd group lens L3, the 4th group lens L4, the 5th group lens L5, the 6th group lens L6 and the 7th group lens L7 move during zooming. The 5th group lens L5 and the 6th group lens L6 are focus lens groups that move during focusing. The lens barrel 2 of the present embodiment includes two focus lens groups. Therefore, the weight of each focus lens group can be reduced, and even an actuator having a small driving force such as a stepping motor can be driven. In addition, the focus performance can be improved.
The 1st group lens L1 is held by the 1st group frame 11, and the 1st group sliding cylinder 12 extends rearward from the 1st group frame 11.
The second group lens L2 is held in the second group frame 21.
The 3-group lens L3 is held in the 3-group frame 31.
The 4-group lens L4 is held in the 4-group frame 41. The 4-group frame 41 is formed from a 4-group holding portion 43 that holds the outer circumference of the 4-group lens L4, a front wall portion 44 that extends from the 4-group holding portion 43 to the outer diameter side, and an outer diameter side end portion of the front wall portion 44. A tubular portion 45 extending to the rear side is provided.
A diaphragm unit 42 is attached to the front side of the 4 group frame 41.

The 5-group lens L5 is held in the 5-group frame 50. The 5-group frame 50 includes a 5-group holding portion 51 that covers the outer periphery of the 5-group lens L5, and a 5-group hood portion 52 that extends forward from the 5-group holding portion 51. The group 5 hood portion 52 may extend to the rear side. The group 5 hood portion 52 is provided to prevent ghosting due to incident of unnecessary light or the like. Instead of the group 5 hood portion 52, a tubular portion 52 may be used.
The 6-group lens L6 is held in the 6-group frame 60. The 6-group frame 60 includes a 6-group holding portion 61 that covers the outer periphery of the 6-group lens L6, and a 6-group hood portion 62 that extends forward from the 6-group holding portion 61. The 6-group hood portion 62 may extend to the rear side. The group 6 hood portion 62 is provided to prevent ghosting due to the incident of unnecessary light or the like. The tubular portion 62 may be used instead of the 6-group hood portion 62.
The 5 group frame 50 and the 6 group frame 60 are arranged on the inner diameter side of the motor sliding cylinder 100. The motor sliding cylinder 100 is arranged in the cylinder portion 45 of the 4 group frame 41. The motor sliding cylinder 100 is driven in the optical axis OA direction during zooming. Further, during zooming and focusing, the 5th group frame 50 is driven in the optical axis OA direction by a 5th group motor (for example, a stepping motor, hereinafter referred to as STM5) fixed to the motor sliding cylinder 100. The 6-group frame 60 is driven in the optical axis OA direction by a 6-group motor (hereinafter referred to as STM6). The motor is not limited to the stepping motor, and may be a DC motor, a voice coil motor, an ultrasonic motor, or the like.

The 7-group lens L7 is held in the 7-group frame 70. The 7-group frame 70 includes a 7-group holding portion 71 that covers the outer periphery of the 7-group lens L7, and a 7-group hood portion 72 that extends forward from the 7-group holding portion 71. The 7-group hood portion 72 may extend to the rear side. A 7-group sliding cylinder 73 is attached to the front end of the 7-group frame 70. The 7-group hood portion 72 is provided to prevent ghosting due to incident of unnecessary light or the like. The tubular portion 72 may be used instead of the 7-group hood portion 72.
The 1st group lens L1, the 2nd group lens L2, the 3rd group lens L3, the 4th group lens L4, the 5th group lens L5, the 6th group lens L6 and the 7th group lens L7 are outer cam cylinders 82 that rotate by the rotation of the zoom ring 81 described later. And it is driven in the optical axis OA direction by the rotation of the inner cam cylinder 83.

(1-2. Mechanical configuration)
The lens barrel 2 includes an outer fixing cylinder 84 and an inner fixing cylinder 85. A zoom ring 81 and a focus ring 86 are rotatably provided on the outer periphery of the outer fixing cylinder 84. A ring for drawing may be provided.

A group 1 sliding cylinder 12 and an outer cam cylinder 82 are arranged between the outer fixing cylinder 84 and the inner fixing cylinder 85 from the outer diameter side.
On the inner diameter side of the inner fixing cylinder 85, a 2nd group frame 21, a 3rd group frame 31, a 4th group frame 41, a motor sliding cylinder 100, and a 7th group frame 70 are arranged. A 5-group frame 50 and a 6-group frame 60 are arranged on the inner diameter side of the motor sliding cylinder 100. Further, the motor sliding cylinder 100 is arranged on the inner diameter side of the 4 group frame 41.
The rear side of the cylinder portion 45 of the 4 group frame 41 has a smaller diameter than the front side, and the inner cam cylinder 83 is arranged between the small diameter portion and the inner fixing cylinder 85.

(1-2-1. Outer cam cylinder 82, inner cam cylinder 83, outer fixing cylinder 84, inner fixing cylinder 85)
A first connecting pin 91 extends from the zoom ring 81 to the inner diameter side.
The first connecting pin 91 penetrates the peripheral groove provided in the outer fixing cylinder 84 and is connected to the outer cam cylinder 82. When the zoom ring 81 is rotated in the circumferential direction, the first connecting pin 91 also rotates and moves in the circumferential direction, and the outer cam cylinder 82 rotates together with the zoom ring 81.
The second connecting pin 92 extends from the inner cam cylinder 83 to the outer diameter side. The second connecting pin 92 penetrates the cam groove for driving the cam provided in the inner fixing cylinder 85, and is inserted into the straight groove provided in the outer cam cylinder 82. When the outer cam cylinder 82 rotates in the circumferential direction, the second connecting pin 92 also rotates in the circumferential direction, and the inner cam cylinder 83 rotates and goes straight.
The outer cam cylinder 82 is provided with four types of cam grooves for driving the first group sliding cylinder 12, the second group frame 21, the third group frame 31, and the fourth group frame 41, respectively.
The inner cam cylinder 83 is provided with a cam groove for driving the 7-group sliding cylinder 73 and a peripheral groove for driving the motor sliding cylinder 100. That is, the moving amount of the inner cam cylinder 83 and the moving amount of the motor sliding cylinder 100 are the same. A cam groove for driving the motor sliding cylinder 100 may be provided so that the moving amount of the inner cam cylinder 83 and the moving amount of the motor sliding cylinder 100 are different.
The outer fixing cylinder 84 is provided with a straight groove for guiding the first group sliding cylinder 12 in a straight direction.
The inner fixing cylinder 85 is provided with three types of straight grooves that guide the second group frame 21, the third group frame 31, and the fourth group frame 41 in a straight direction. Further, a cam groove for driving the 7-group sliding cylinder 73 is provided. Further, as described above, the cam groove of the inner cam cylinder 83 is provided.
The 4 group frame 41 is provided with a straight groove for guiding the motor sliding cylinder 100 in a straight line.

(1-2-2. Mechanical drive of each lens group)
The group 1 sliding cylinder 12 moves linearly in the optical axis OA direction without rotating due to the cam groove of the outer cam cylinder 82 and the straight groove of the outer fixing cylinder 84.
The 2nd group frame 21, the 3rd group frame 31 and the 4th group frame 41 move straight in the optical axis OA direction without rotating due to the cam groove of the outer cam cylinder 82 and the straight groove of the inner fixing cylinder 85. That is, while being driven in the direction of the optical axis OA by the cam groove of the rotating outer cam cylinder 82, it is guided straight by the straight groove of the inner fixing cylinder 85.
The motor sliding cylinder 100 moves linearly in the optical axis OA direction without rotating due to the peripheral groove of the inner cam cylinder 83 and the straight groove of the 4 group frame 41.

The 7-group sliding cylinder 73 moves straight in the optical axis OA direction without rotating due to the cam groove of the inner cam cylinder 83 that rotates and goes straight and the cam groove of the inner fixed cylinder 85.

(1-3. Configuration of focus mechanism part)
(1-3-1. Mechanical drive of motor sliding cylinder 100)
FIG. 2 is a partial cross-sectional view of the lens barrel 2. Note that FIG. 2 is different from the state of FIG. 1 in the position and angle of each lens group. As shown in the figure, the motor sliding cylinder 100 is arranged on the inner diameter side of the 4 group frame 41 (cylinder portion 45).
As described above, when the zoom ring 81 rotates, the outer cam cylinder 82 also rotates by the first connecting pin 91. Since the outer cam cylinder 82 and the inner cam cylinder 83 are engaged with each other by the second connecting pin 92 penetrating the cam groove of the inner fixing cylinder 85, when the outer cam cylinder 82 rotates, the inner cam cylinder 83 rotates. Go straight.
A cam pin 101 extends from the motor sliding cylinder 100 to the outer diameter side. The cam pin 101 penetrates the straight groove 45a provided in the tubular portion 45 of the 4 group frame 41 and engages with the peripheral groove 83a provided in the inner cam cylinder 83.
Therefore, when the inner cam cylinder 83 moves straight while rotating, the motor sliding cylinder 100 is guided straight by the straight groove 45a provided in the cylinder portion 45 by the cam pin 101, and the straight component of the movement of the inner cam cylinder 83. Moves straight along with. Therefore, when the zoom ring 81 rotates, the motor sliding cylinder 100 moves straight ahead without rotating, so that the 5th group lens L5 and the 6th group lens L6 move straight ahead.
Further, STM5 and STM6 are fixed to the motor sliding cylinder 100. Based on the rotation of the zoom ring 81 or the focus ring 86, the STM5 drives the 5-group lens L5 in the optical axis direction, and the STM6 drives the 6-group lens L6 in the optical axis direction. That is, the 5-group lens L5 (5-group frame 50) and the 6-group lens L6 (6-group frame 60) move in the optical axis direction with respect to the motor sliding cylinder 100, respectively. The lens drive by STM5 and STM6 will be described later.

FIG. 5 is a side view including the motor sliding cylinder 100 and a portion on the inner diameter side of the motor sliding cylinder 100. A 5-group lens drive unit 500 for driving the 5-group lens L5 and a 6-group lens drive unit 600 for driving the 6-group lens L6 are fixed to the motor sliding cylinder 100 with screws (screws in the figure are shown in the figure). Not shown). FIG. 6 is a perspective view showing the 5-group lens drive unit 500.

The motor sliding cylinder 100 includes a 5-group lens drive unit 500 including an STM5 for driving the 5-group lens L5, which is a focus lens, and a 6-group lens drive unit including an STM6 for driving the 6-group lens L6, which is a focus lens. 600 and are attached.

(1-3-2. Drive control of L5 and L6 by the lens drive unit)
FIG. 3 is a view of a part of the focus ring 86 viewed from the inner diameter side. FIG. 4 is a view of a part of the outer fixing cylinder 84 as viewed from the outer diameter side.
As shown in FIG. 3, a reflective tape 86a is attached to the inner diameter side of the focus ring 86 in the circumferential direction. A light-shielding line 86b extending in the optical axis OA direction is formed on the reflective tape 86a.
As shown in FIG. 4, a photointerruptor 84a for detecting the rotation of the focus ring 86 is attached to the outer diameter side of the outer fixing cylinder 84 on the inner peripheral side of the focus ring 86.
When the focus ring 86 is rotated, the reflective tape 86a is also rotated. The photo interrupter 84a detects a light-shielding pulse generated by the light-shielding line 86b of the reflective tape 86a. The number of light-shielding pulses corresponds to the amount of rotation of the focus ring 86.

As shown in FIG. 1, a main substrate 88 is attached to the rear end of the internal fixation cylinder 85 by screws. An FPC (not shown) extends from the photo interrupter 84a to the main substrate 88. The main board 88 has a control unit 90, and a light-shielding pulse signal corresponding to the amount of rotation of the focus ring 86 is input to the control unit 90 from the photointerruptor 84a via the FPC. With the above configuration, the amount of rotation of the focus ring 86 can be detected.

When the focus ring 86 rotates, the photointerruptor 84a detects the amount of rotation and sends a signal to the control unit 90 of the main board 88. In addition, a signal is sent from the camera body 3 to the control unit 90 of the main board 88 by a focusing operation such as by pressing the release halfway of the photographer.
Then, a pulse is transmitted from the control unit 90 to the STM5 to drive the STM5. When the STM5 is driven, the lead screw 502 rotates and the 5th group lens L5 can be moved. The same applies to the driving of the 6-group lens L6.

Further, on the inner diameter side of the zoom ring 81, a rotation detection unit (not shown) for detecting the amount of rotation of the zoom ring 81 is provided. For example, a potentiometer or the like can be mentioned. From the potentiometer, the FPC extends to the main board 88. The control unit 90 can determine the amount of rotation of the zoom ring 81 based on the value detected from the potentiometer.
When the rotation of the zoom ring 81 is detected by the potentiometer, the control unit 90 drives the STM 5 with a drive amount corresponding to the rotation amount of the zoom ring 81. When the STM5 is driven, the group 5 lens L5 moves in the optical axis OA direction. The same applies to the 6-group lens L6.
A potentiometer may be used to detect the rotation of the focus ring, or a reflective tape and a photo interrupter may be used to detect the rotation of the zoom ring. Other detection means such as magnetic detection may be used.

(1-3-3. Details of lens drive unit)
Next, the 5-group lens drive unit 500 will be described. Since the 6-group lens drive unit 600 has the same configuration as the 5-group lens drive unit 500, description thereof will be omitted.

As shown in FIG. 6, the group 5 lens drive unit 500 includes a unit frame 501 screwed to the motor sliding cylinder 100, an STM5 fixed to the front end of the unit frame 501, and a rear side in the optical axis OA direction from the STM5. It is provided with a lead screw 502 whose rear end side is rotatably held by the unit frame 501, and a moving rack 503 which meshes with the lead screw 502 and moves in the optical axis OA direction by rotation of the lead screw 502. The STM 5 may be fixed to the rear end of the unit frame 501. In that case, the lead screw 502 extends from the STM 5 to the front side in the optical axis OA direction. The lead screw 602 extending from the STM 6 may extend in the same direction as the lead screw 502, or may extend in the opposite direction. That is, when the lead screw 502 extends to the rear side in the optical axis OA direction, the lead screw 602 extends to the rear side in the optical axis OA direction. In this case, the relationship between the driving direction of the STM 5 and the moving direction of the 5th group lens L5 can be the same as the relationship between the driving direction of the STM 6 and the moving direction of the 6th group lens L6. Alternatively, when the lead screw 502 extends to the rear side in the optical axis OA direction, the lead screw 602 may extend to the front side in the optical axis OA direction. In this case, the lens barrel can be made thinner in the optical axis direction.

(Unit frame 501)
The unit frame 501 includes a plate-shaped unit fixing portion 501a extending in the optical axis OA direction, an STM fixing portion 501b extending from the unit fixing portion 501a at a front end of the unit fixing portion 501a by bending at a substantially right angle in the inner diameter direction, and the unit fixing. At the rear end of the portion 501a, a lead screw holding portion 501c extending from the unit fixing portion 501a by bending at a substantially right angle in the inner diameter direction is provided.

As shown in FIG. 5 described above, the unit fixing portion 501a is arranged on the outer periphery of the motor sliding cylinder 100 and is screwed to the motor sliding cylinder 100.
The STM5 is fixed to the STM fixing portion 501b, and the rear end side of the lead screw 502 is rotatably held by the lead screw holding portion 501c.

(STM5)
An FPC (not shown) extending from the main board 88 is connected to the STM5.

(Lead screw 502)
The lead screw 502 is rotationally driven by the rotational force of the STM5. The outer circumference of the lead screw 502 is threaded.

(Moving rack 503)
FIG. 7 is a perspective view showing only a portion of the moving rack 503 in FIG. The moving rack 503 includes a meshing portion 504 and an engaging shaft portion 505. The meshing portion 504 has a U-shaped radial cross section, and a meshing portion 504 that meshes with the threaded portion of the lead screw 502 is provided on the inner surface of the U-shaped portion through which the lead screw 502 is inserted.
An engaging shaft portion 505 is provided on the opposite side of the lens barrel 2 in the circumferential direction with respect to the portion of the moving rack 503 where the meshing portion 504 is provided.
The engaging shaft portion 505 is a columnar member extending in the optical axis OA direction, and in the present embodiment, the diameters are different in the order of the rear small diameter portion 505a, the medium diameter portion 505b, the large diameter portion 505c, and the front small diameter portion 505d from the rear side. Has a part.

(1-3-4. Details of lens group frame)
As shown in FIG. 6 and the like, the 5th group frame 50 is provided with a protruding portion 510 extending from the outer periphery of the portion covering the outer periphery of the 5th group lens L5 to the outer diameter side in the radial direction. The projecting portion 510 includes a main guide bar engaging portion 511, a light-shielding portion 512 (in the case of a 6-group frame, a light-shielding portion 612), and a rack engaging portion (straight-ahead drive portion) 513.
The protrusion 510 is for driving the 5-group lens L5 corresponding to the 5-group lens drive unit 500. A similar protrusion 610 (shown in FIG. 8 to be described later) is provided for driving the 6-group lens L6, but the description is omitted because it has the same configuration as the protrusion 510 for driving the 5-group lens L5. ..

(Main guide bar engaging part 511)
The main guide bar engaging portion 511 includes a front wall 511a, a rear wall 511b provided in a parallel separation relationship with respect to the front wall 511a, and two side walls 511c and 511d connecting the front wall 511a and the rear wall 511b. , Equipped with. The front wall 511a and the rear wall 511b are each provided with a guide bar insertion hole 511e through which the main guide bar 151, which will be described later, slides through.

FIG. 8 is a radial cross-sectional view of the internal fixation cylinder 85, the motor sliding cylinder 100, the 5th group holding portion 51, the 6th group holding portion 61, and the STM5 and STM6 as viewed from the front side.
As described above with reference to FIG. 6, a protruding portion 510 extending from the outer circumference of the group 5 holding portion 51 to the outer diameter side is provided. The protruding portion 510 includes a main guide bar engaging portion 511. Further, the group 5 holding portion 51 is also provided with a sub guide bar engaging portion 552 extending in the radial direction from the outer circumference. The sub-guide bar engaging portion 552 is provided at a position of approximately 180 degrees with respect to the main guide bar 151 of the protruding portion 510.

As described above, the main guide bar engaging portion 511 includes a front wall 511a and a rear wall 511b that are parallel to each other, and the main guide bar 151 is inserted into the guide bar insertion holes 511e provided in each. (In the description described later, the distance from the front end of the front wall 511a to the rear end of the rear wall 511b is referred to as the engagement length). The 5 group holding portion 51 is guided in the optical axis OA direction by the main guide bar 151.

The sub-guide bar engaging portion 552 is a member provided with a U-shaped groove whose outer diameter side is open. The sub guide bar 152 is inserted through this U-shaped groove. Since the U-shaped groove of the sub-guide bar engaging portion 552 is engaged with the sub-guide bar 152 in this way, rotation in the circumferential direction around the main guide bar 151 is prevented.
Similarly, for the 6-group frame 60, the sub-guide bar engaging portion 652 is located at a position approximately 180 degrees with respect to the protruding portion 610 provided with the main guide bar engaging portion 611 in the lens holding portion. It extends to the outer diameter side.

(Shading part 512)
The light-shielding portion 512 is provided so as to project from the side wall 511d toward the outer diameter side. The light-shielding portion 512 is a rectangular plate-shaped portion extending by a predetermined distance in the optical axis OA direction. The light-shielding portion 512 may be provided on the side wall 511c. The light-shielding portion 512 is a member for light-shielding PI5 provided on the motor sliding cylinder. The position of the 5th group lens L5 can be detected by the light-shielding portion 512 and PI5.

(Rack engaging portion 513)
The rack engaging portion 513 extends from the side wall 511c toward the group 5 lens drive unit 500 side.
The rack engaging portion 513 includes a front arm 513a and a rear arm 513b provided in a parallel separation relationship with respect to the front arm 513a. The rear arm 513b extends continuously from the rear wall 511b toward the 5-group lens drive unit 500, and the front arm 513a is a 5-group lens drive unit 500 from the position of the other side wall 511c from the rear wall 511b rather than the front wall 511a. It extends to the side.
Through holes 513d and 513e are provided in the front arm 513a and the rear arm 513b, respectively. The through hole 513d of the front arm 513a is a circular through hole. The through hole 513e of the rear arm 513b is a circular through hole, but is provided with a notch in the radial direction of the through hole.

An engaging shaft portion 505 is arranged between the front arm 513a and the rear arm 513b.
The through holes 513d and 513e have a larger diameter than the two rear small diameter portions 505a and the front small diameter portion 505d of the engaging shaft portion 505. Further, the through holes 513d and 513e have a smaller diameter than the medium diameter portion 505b and the large diameter portion 505c of the engaging shaft portion 505.
The front small diameter portion 505d of the engaging shaft portion 505 is inserted into the through hole 513d of the front arm 513a. A rear small diameter portion 505a of the engaging shaft portion 505 is inserted into the through hole 513e of the rear arm 513b. At this time, since the through hole 513e is provided with a notch, after inserting the front small diameter portion 505d into the through hole 513d of the front arm 513a, the rear small diameter portion 505a is inserted into the through hole 513e laterally from the notch. Can be put in.

(Coil spring 506)
When the medium diameter portion 505b and the large diameter portion 505c of the engaging shaft portion 505 are arranged between the front arm 513a and the rear arm 513b due to a manufacturing error or bending of the front arm 513a and the rear arm 513b. In addition, a gap is formed between the side surface of the small diameter portion 505a of the medium diameter portion 505b and the side surface of the large diameter portion 505c on the medium diameter portion 505b side and the side surfaces of the front arm 513a and the rear arm 513b, and the rack engaging portion 513. It is conceivable that the engaging shaft portion 505 rattles.
Therefore, the coil spring 506 is arranged on the outer circumference of the medium diameter portion 505b. The diameter of the coil spring 506 is larger than the diameter of the small diameter portion 505a and the medium diameter portion 505b and smaller than the diameter of the large diameter portion 505c. The coil spring 506 is arranged between the rear arm 513b and the large diameter portion 505c, and urges the rear arm 513b (that is, the 5 group frame 50) to the rear side in the optical axis OA direction.

When the lead screw 502 is rotated by driving the STM5, the moving rack 503 moves in the optical axis OA (direction along the optical axis OA) by meshing with the meshing portion 504 of the moving rack 503 and the threaded portion of the lead screw 502.
Further, since the coil spring 506 also generates an urging force in the circumferential direction, the 5 group frame 50 can be urged in the circumferential direction as well.

FIG. 9 is a diagram illustrating positions of the main guide bars 151 and 161 and the sub guide bars 152 and 162 extending to the optical axis OA. As shown in the figure, a guide bar holding member 170 is screwed to the rear end of the 4 group frame 41. The guide bar pressing member 170 may be integrally formed with the 4-group frame 41 instead of being screwed. In that case, the guide bar holding member 170 can also be considered as a part of the 4 group frame 41.
The main guide bar 151 and the sub guide bar 152 for the 5th group, and the main guide bar 161 and the sub guide bar 162 for the 6th group extend between the front wall portion 44 of the 4th group frame 41 and the guide bar holding member 170. There is.
The sub guide bar may be shared between the 5th group and the 6th group. In this case, the number of guide bars can be reduced by one. Further, the main guide bar may be shared between the 5th group and the 6th group.

(2. Position of lens drive unit)
Returning to FIG. 8, when viewed from one side of the optical axis OA (front in FIG. 8), the main guide bar 151 is arranged closer to the STM 5 (or the lead screw 502 extending from the STM 5) as compared with the sub guide bar 152. ing. In other words, the STM5 (or the lead screw 502 extending from the STM5) is arranged closer to the main guide bar 151 than the sub guide bar 152 in the circumferential direction. The same applies to STM6. Further, as shown in FIG. 8, the main guide bar 151, the sub guide bar 152, the main guide bar 161 and the sub guide bar 162 are arranged concentrically when viewed from the optical axis direction.

When the STM 5 is driven and the reed screw 502 rotates, the protrusion 510 also moves in the optical axis direction as the moving rack 503 moves in the optical axis direction. At that time, the main guide bar engaging portion 511 is guided by the main guide bar 151 and moves to be positioned in the optical axis OA direction.
By arranging the main guide bar 151 and the lead screw 502 of the STM 5 close to each other, it is possible to suppress backlash and bending of the member between the main guide bar 151 and the lead screw 502.
As for the 6 groups, the main guide bar 161 is arranged closer to the STM 6 than the sub guide bar 162 when viewed in a plane orthogonal to the optical axis OA of the main guide bar 161 and the sub guide bar 162. There is.

Reference numeral 42a shown in FIG. 8 indicates the position of the diaphragm STM 42a that drives the diaphragm unit 42. The STM5, STM6, and STM42a for aperture are movable in the optical axis direction. As shown in the figure, when viewed from one of the optical axes OA (front in FIG. 8), the STM5 for the 5th group and the STM6 for the 6th group are arranged at positions that do not overlap with the aperture STM42a (positions that do not interfere with each other). Has been done. In other words, STM5, STM6, and diaphragm STM42a are arranged apart from each other in the circumferential direction. As a result, even if the STM5, STM6 or the diaphragm STM42a moves in the optical axis direction, they do not collide with each other. The STM5, STM6, and STM42a may be arranged at equal intervals. In this case, the weight distribution can be dispersed.

(Shape and arrangement of 3.5 group frame 50 and 6 group frame 60)
(3-1. Engagement with guide bar)
FIG. 10 shows the engagement length between the main guide bar engaging portion 511 and the main guide bar 151 of the 5 group holding portion 51, and the engagement between the main guide bar engaging portion 622 and the main guide bar 151 of the 6 group frame 60. It is a figure explaining the total length. The main guide bar engaging portion 511 includes a front wall 511a and a rear wall 511b that are separated from each other by a predetermined distance as described above, and the main guide bar 151 is inserted into the circular guide bar insertion holes 511e provided in each. There is. The front wall 511a and the rear wall 511b may be connected to each other. That is, the main guide bar engaging portion 511 may be provided with one guide bar insertion hole 511e.

In the specification, the engagement length means the length at which the guide bar and the engaging portion that engages with the guide bar engage. As described above, the engagement length between the main guide bar engaging portion 511 and the main guide bar 151 of the 5 group holding portion 51 is the length from the front end of the front wall 511a to the rear end of the rear wall 511b (EL5). ). The engagement length between the main guide bar engaging portion 611 and the main guide bar 161 of the 6-group frame 60 is the length from the front end of the front wall 611a to the rear end of the rear wall 611b (EL6).

The tilt of the 5th group lens L5 can be prevented by engaging the main guide bar engaging portion 511 with the main guide bar 151. In the engagement length EL5, when the 5th group lens L5 moves, the front wall 511a of the main guide bar engaging portion 511 does not hit the rear surface of the front wall portion 44 of the 4th group frame 41, and the main guide bar engaging portion The rear wall 511b of 511 is a range that does not hit the front surface of the guide bar holding member 170. That is, the engagement length EL5 is limited by the movement amount of the 5th group lens L5, the engagement length EL5 becomes shorter when the movement amount of the 5th group lens L5 is large, and the engagement length becomes shorter when the movement amount of the 5th group lens L5 is small. The EL5 can be lengthened. The engagement length EL5 may be a length that can prevent the 5th group lens L5 from tilting. The same applies to the engagement length EL6.

When the movement amount of the 6-group lens L6 moved by the STM6 is smaller than the movement amount of the 5-group lens L5 moved by the STM5 (in other words, the movement amount of the 5-group lens L5 moved by the STM5 is the 6-group movement by the STM6. The engagement length EL6 can be longer than the engagement length EL5 (when it is larger than the movement amount of the lens L6). That is, the engagement length EL6 between the 6-group frame 60 and the main guide bar, which has a small amount of movement in the optical axis direction, can be made longer than the engagement length EL5 between the 5-group frame 50 and the main guide bar. As a result, the inclination of the 5-group lens L5 and the 6-group lens L6, which are the focus lens groups, with respect to the optical axis OA can be reduced. The engagement length EL6 does not necessarily have to be longer than the engagement length EL5. The engagement length may be any length as long as the inclination of each lens group with respect to the optical axis OA is sufficiently small.

(3-2. Notch)
FIG. 11 is a diagram showing the positional relationship between the 5 group frames 50 and the 6 group frames 60 when the focal length is on the telephoto side and the subject distance is on the infinite side, and the 5 group holding portions 51 and the 6 group frames 60 of the 5 group frames 50 are shown. The 6-group hood portion 62 of the above is relatively separated. FIG. 12 is a diagram showing the positional relationship between the 5 group frames 50 and the 6 group frames 60 when the focal length is on the wide-angle side and the subject distance is on the close side, and the 5 group holding portions 51 and the 6 group frames 60 of the 5 group frames 50 are shown. 6 group hood part 62 is relatively close to each other. FIG. 13 is a diagram showing the positional relationship between the 5th group frame 50 and the 6th group frame 60 in the same state as in FIG. 12 from different angles, and shows the 5th group holding portion 51 and the 6th group frame 60 of the 5th group frame 50. It shows a state in which the hood portion 62 of the 6th group is approaching. As shown in the figure, the 5-group frame 50 is arranged on the inner peripheral side of the 6-group frame 60. That is, when the 5th group frame 50 or the 6th group frame 60 moves in the optical axis direction, at least a part of the 5th group frame 50 and the 6th group frame 60 are overlapped when viewed from the direction perpendicular to the optical axis (radial direction). There is a situation where it is placed in. Specifically, in the state shown in FIG. 13, at least one part of the 5th group frame 50 and the 6th group frame 60 overlaps when viewed from the direction perpendicular to the optical axis.

As shown in the figure, the 5 group holding portion 51 includes the above-mentioned protrusion 510 (FIGS. 11 and 12), the sub guide bar engagement portion 552 (FIG. 13), other protrusions 560, and the like on the outer diameter side. A plurality of protrusions extending to the surface are provided. The other protrusions 560 are protrusions required at the time of assembly used when, for example, the 5th group lens L5 is attached to the 5th group holding portion 51 and crimped, and as shown in FIG. 8, there are three protrusions in the circumferential direction. Have been placed. In other words, the protrusion or protrusion is a protrusion (protrusion) that protrudes or rises in the direction (diameter) perpendicular to the optical axis.

Here, in the embodiment, at the end of the 6-group hood portion 62 of the 6-group frame 60 in the optical axis OA direction, the protrusions of the 5 group holding portion 51 (protruding portion 510, protrusion 560, sub-guide bar engaging portion). A notch 65 is provided corresponding to 552 etc.).
Therefore, as shown in FIGS. 12 and 13, even when the 5th group frame 50 and the 6th group frame 60 are close to each other, the protrusions of the 5th group holding portion 51 (protrusions 510, protrusions 560, sub-guide bar) The movement of the 6-group frame 60 is not hindered by the joint portion 552, etc.). That is, the 5th group frame 50 and the 6th group frame 60 do not collide with each other.

That is, when the 5th group frame 50 and the 6th group frame 60 are close to each other, the protrusions (protruding portion 510, protrusion 560, sub guide bar engaging portion 552, etc.) of the 5th group holding portion 51 are the 6th group frame 60. Enter the notch 65. In other words, when the distance between the 5th group frame 50 and the 6th group frame 60 is small (for example, when the 5th group frame 50 and the 6th group frame 60 are closest to each other, the distance between the 5th group frame 50 and the 6th group frame 60 is the largest. (When small), in the circumferential direction centered on the optical axis, the protrusions of the 5th group holding portion 51 (protrusions 510, protrusions 560, sub-guide bar engaging portion 552, etc.) and the notch 65 of the 6th group frame 60. At least one copy overlaps. Thereby, the collision between the 5th group frame 50 and the 6th group frame 60 can be avoided. The distance between the 5th group lens L5 and the 6th group lens L6 can be made closer. The lens barrel 2 as a whole can be further made compact.
Further, since the 5th group frame 50 and the 6th group frame 60 do not interfere with each other, it is possible to increase the relative movement amount of the 5th group frame 50 and the 6th group frame 60 in the optical axis OA direction, and the lens group can be increased. The degree of freedom in design is improved.

(3-3.5 Arrangement of group frame 50)
As shown in FIG. 14 and the like, the STM5 or STM6 (see FIG. 5 for the position of the STM6) is arranged in the order from the optical axis direction, in the order of the 5-group lens L5 and the 6-group lens L6. That is, the 5-group lens L5 is arranged between the STM 6 and the 6-group lens L6. As a result, the lens barrel can be made thinner in the optical axis direction than when the 5-group lens L5, STM6, and 6-group lens L6 are arranged in this order from the optical axis direction.

(4. Hood)
FIG. 14 is a cross-sectional view of a part of the lens barrel 2, showing a state in which the 4-group lens L4 and the 5-group lens L5 are close to each other. When the 4-group lens L4 and the 5-group lens L5 are close to each other, the 4-group frame 41 (or the 4-group lens L4 or the 4-group holding portion 43) is covered with the 5-group frame 50 (or the 5-group hood portion 52). ing. In other words, in the situation where the 5-group lens L5 is closest to the 4-group lens L4, the 4-group frame 41 (or the 4-group lens L4 or the 4-group holding portion 43) and the 5-group frame 50 (or the 5-group hood portion 52) ) Means that at least a part of the lens overlaps when viewed in the radial direction centered on the optical axis. That is, at least a part of the 4th group frame 41 and the 5th group frame 50 overlap on the optical axis. The diameter of the group 5 hood portion 52 is larger than the diameter of the group 4 lens L4.
FIG. 15 is a partially enlarged view of the 4-group lens L4 and the 5-group hood portion 52, showing a state in which the 5-group hood portion 52 does not cover the 4-group frame 41. That is, it shows a state in which the 4th group frame 41 and the 5th group frame 50 do not overlap in the radial direction.

Similarly, the 6-group frame 60 and the 7-group frame 70 also include a 6-group hood portion 62 and a 7-group hood portion 72.
Specifically, when the 5-group lens L5 and the 6-group lens L6 are close to each other, the 5-group frame 50 (or the 5-group lens L5 or the 5-group holding portion 51) has the 6-group frame 60 (or the 6-group hood portion) 62) is overlaid. In other words, in the situation where the 5-group lens L5 and the 6-group lens L6 are closest to each other, at least a part of the 5-group frame 50 and the 6-group frame 60 overlap when viewed in the radial direction. That is, at least a part of the 5th group frame 50 and the 6th group frame 60 overlap on the optical axis. The diameter of the 6-group hood portion 62 is larger than the diameter of the 5-group lens L5.
Further, when the 6-group lens L6 and the 7-group lens L7 are close to each other, the 7-group frame 70 (or the 7-group hood portion 72) is attached to the 6-group frame 60 (or the 6-group lens L6 or the 6-group holding portion 61). It covers it. In other words, in the situation where the 6-group lens L6 and the 7-group lens L7 are closest to each other, at least a part of the 6-group frame 60 and the 7-group frame 70 overlap when viewed in the radial direction. That is, at least a part of the 6-group frame 60 and the 7-group frame 70 overlap on the optical axis. The diameter of the 7-group hood portion 72 is larger than the diameter of the 6-group lens L6.

As shown in the figure, the 5th group hood portion 52.6th group hood portion 62.7th group hood portion 72 extends forward from the 5th group lens L5 / 6th group lens L6 / 7th group lens L7, respectively, and thereby due to stray light or the like. Ghosts are prevented. In addition, each hood part may extend to the rear side.
As shown in FIG. 5, the motor sliding cylinder 100 covers the outer periphery of the 5-group lens L5 and the 6-group lens L6. However, the motor sliding cylinder 100 is provided with a plurality of holes and the like for attaching a photo interrupter, STM5, STM6, and the like. In addition, a plurality of holes for screwing to attach these are provided.
Since the motor sliding cylinder 100 is provided with a plurality of holes in this way, the subject light leaks and proceeds to the outside of the motor sliding cylinder 100, or the light enters through the holes and becomes stray light and is mixed with the subject light. Therefore, the captured image may be deteriorated.

For example, when there is one STM fixed to the motor sliding cylinder 100, there are more holes or the like for attaching the STM in the case of two, and the possibility of deterioration of the captured image such as a ghost increases.

However, by providing the group 5 hood section 52, the group 6 hood section 62, and the group 7 hood section 72, it is possible to prevent the photographed image from being deteriorated by stray light. In the embodiment, the 5th group hood part 52 is separate from the 5th group holding part 51, the 6th group hood part 62 is integrated with the 6th group holding part 61, and the 7th group hood part 72 is integrated with the 7th group holding part 71. Although shown, the hood and the lens frame may be integrated or separate.

When the lens group moves in the optical axis OA direction, the 5th group hood portion 52, the 6th group hood portion 62, and the 7th group hood portion 72 surround the front lens group in the optical axis OA direction with the hood of the rear lens group. Surrounding.

As shown in FIG. 14, the diameters of the 5th group hood portion 52, the 6th group hood portion 62, and the 7th group hood portion 72 are larger in this order.
Then, when there is a protrusion protruding on the outer diameter side of the hood portion located on the inner diameter side, a recess (escape portion) for escaping the protrusion is provided in the hood portion on the outer diameter side. For example, a protrusion 43a as shown in FIG. 15 is provided on the outer periphery of the 4th group holding portion 43, and a recess (groove) 52b corresponding to the protrusion 53a is provided on the 5th group hood portion 52 on the outer diameter side. Provide. Since the protrusion 53a can be escaped by the recess 52b, it is possible to prevent the collision between the group 4 holding portion 43 and the group 5 hood portion 52. Further, the group 5 hood portion 52 can cover the group 4 holding portion 43, and it is possible to prevent the leakage of the subject light and the deterioration of the captured image due to the influence of stray light and the like. Similarly, if there is a protrusion on the outer diameter side of the group 5 holding frame 50, a recess may be provided in the group 6 hood portion 62. If there is a protrusion on the outer diameter side of the 6-group frame 60, a recess may be provided in the 7-group hood portion 72. In addition, it is not limited to a dent (groove), and may be a notch, for example. Moreover, it is not necessary for all the hood portions to have recesses (grooves).
Further, the recesses (grooves, relief portions) 52b may be all around the circumference in the circumferential direction, or may be a part of the circumference.

Further, the inner surfaces of the group 5 hood portion 52, the group 6 hood portion 62, and the group 7 hood portion 72 are provided with light-shielding properties (light-shielding lines 52a, 62a, 72a) extending in the circumferential direction. The shading line may be a groove or a step.
A light-shielding line may be provided in all of the group 5 hood portion 52, the group 6 hood portion 62, and the group 7 hood portion 72, or a hood without a light-shielding line may be provided.

Further, as can be seen from FIG. 14 and the like, the STM5 or STM6 (see FIG. 5 for the position of the STM6) is arranged in the order of the 5th group lens L5 and the 6th group lens L6 from the subject side in the optical axis direction. As shown in the figure, the 5-group lens L5 has a smaller diameter than the 6-group lens L6. That is, in the embodiment, the STM, the small-diameter lens (5-group lens L5), and the large-diameter lens (6-group lens L6) are arranged in this order from the subject side in the optical axis direction. Therefore, the diameter of the 6-group hood portion 62 is larger than the diameter of the 5-group lens L5.

As described above, the 5-group hood portion 52 extends forward from the 5-group lens L5, and the 6-group hood portion 62 extends forward from the 6-group lens L6. When the 5th group lens L5 and the 6th group lens L6 move in the optical axis OA direction, the 5th group hood portion 52 and the 6th group hood portion 62 also move.
As shown in FIG. 14, when the group 5 lens L5 is close to the STM5 (or STM6), the group 5 hood portion 52 may be arranged on the inner diameter side of the STM5 (or STM6).

At this time, since the diameter of the 5th group lens L5 is small, the outer diameter of the lens barrel 2 as a whole is increased even considering the situation where the 5th group hood portion 52 is arranged on the inner diameter side of the STM5 (or STM6). You don't have to.

Further, the STM5 (or STM6) is arranged on the outer circumference of the 4-group lens L4 which is arranged further before the 5-group lens L5. The 4-group lens L4 has a smaller diameter than the 5-group lens L5, and the outer diameter of the 4-group holding portion 43 is even smaller than the 5-group hood portion 52. That is, the diameter of the group 5 hood portion 52 is larger than the diameter of the group 4 lens L4.
That is, a plurality of lens groups having larger diameters are arranged in the direction of the optical axis OA, and the STM5 (or STM6) is arranged on the outer circumference of the 4-group lens L4, which is the smallest lens group among them.
According to this, the STM5 (or STM6) is arranged on the outer diameter side of the 4-group lens L4, which is the smallest lens group, and the 5-group hood portion 52 having a diameter larger than that of the 4-group lens L4 is located in the gap between the 4-group lens L4 and the STM5. Can be placed. Therefore, since the distance between the 4th group lens L4 and the 5th group lens L5 can be made close to each other, it is possible to make the optical axis OA direction or the radial direction compact.

Further, a 4-group lens L4 is arranged after the aperture unit 42. The lens group that comes after the aperture unit 42 is often smaller than the other lens groups. Therefore, the aperture unit 42, the minimum diameter lens (4 group lens L4), the small diameter lens (5 group lens L5), and the large diameter lens (6 group lens L6) are arranged in this order from the subject side in the optical axis direction, and the minimum diameter lens (4). By arranging the STM5 (or STM6) on the outer diameter side of the group lens L4), the lens barrel 2 can be made compact.
It is not necessary that all of the 5th group frame 50, the 6th group frame 60, and the 7th group frame 70 are provided with the hood portion. Any one or two of the 5 group frame 50, the 6 group frame 60, and the 7 group frame 70 may be provided.
In the situation where the front and rear lens groups are closest to each other, the hood of the rear lens group overlaps with the front lens group, but this is not limited to this. The length may be as long as it is necessary to prevent deterioration of the captured images, and it does not necessarily have to overlap.

(5. Photo interrupter)
As shown in FIG. 5, a photo interrupter PI5 for the 5th group and a photointerruptor PI6 for the 6th group are attached to the motor sliding cylinder 100 (FIG. 5 shows only the 5th group). Hereinafter, the photo interrupter PI5 for 5 groups will be described. Since the description of the photo interrupter PI6 for the 6th group is the same as that of the photointerruptor PI5 for the 5th group, the description thereof will be omitted.

As shown in FIG. 6 and the like, in the 5-group photo interrupter PI5, when the 5-group lens L5 is driven by the 5-group lens drive unit 500, the light-shielding unit 512 becomes a light emitting unit and a light-receiving unit of the 5-group photo interrupter PI5. It is arranged in a position where it can pass between.
The light-shielding portion 512 is arranged on the outer diameter side of the 5-group lens L5 on the optical axis OA in order to detect the position.

By the way, the position of the lens group when the power of the camera body 3 is turned on is not determined because it depends on the state when the power is turned off. Therefore, the position of each lens group when the power of the camera body 3 is turned on is not fixed, and it is unknown where the lens group is located.
Therefore, to explain the 5-group lens L5 as an example, first, the STM 5 is driven by a drive instruction from the control unit 90 of the main board 88 to move the 5-group frame 50. Then, the 5th group lens L5 is detected by passing the light shielding portion 512 provided on the 5th group holding portion 51 between the light emitting portion and the light receiving portion of the 5th group photo interrupter PI5. The 5-group lens L5 is moved with the position of the 5-group lens L5 when the light-shielding portion 512 passes (light-shields) the PI 5 as a reference position. That is, the photo interrupter PI5 for the 5th group is arranged at the reference position of the 5th group lens L5. Hereinafter, the reference position of the 5-group lens L5 is referred to as the 5-group origin position. The same applies to the 6th group.

The 5th group lens L5 moves to the initial position after moving to the reference position (origin position). The initial position is the position on the infinite side (for example, the infinite end) of the set focal length. When the initial position is set to the infinite side, a through image with less blur can be displayed. Further, when shooting with the focus position (shooting distance) set to the infinite side, the user does not have to change the shooting distance after the initial operation.

FIG. 16 is a flowchart illustrating the initial operation of the control unit 90 of the lens barrel 2. This flowchart starts when the user turns on the power of the camera body 3.
In S01, the control unit 90 detects that the power of the camera body 3 is turned on and proceeds to S02.
In S02, the control unit 90 drives the STM6 to move the 6-group frame 60 (6-group lens L6) in the optical axis direction and proceeds to S03.
In S03, the control unit 90 determines whether or not the 6-group lens L6 has moved to the 6-group origin position. As described above, the control unit 90 can determine by detecting whether or not the PI 6 is shielded by the light shielding unit 612. When the control unit 90 determines that the 6-group lens L6 has moved to the 6-group origin position, the process proceeds to S04. If not, the process returns to S02, and S02 and S03 are repeated until it is determined that the 6-group lens L6 has moved to the 6-group origin position.
In S04, the control unit 90 drives the STM 5 to move the 5 group frame 50 (5 group lens L5) in the optical axis direction. Proceed to S05.
In S05, the control unit 90 determines whether or not the 5th group lens L5 has moved to the 5th group origin position. As described above, the control unit 90 can determine by detecting whether or not the PI5 is shielded by the light-shielding unit 512. When the control unit 90 determines that the 5th group lens L5 has moved to the 5th group origin position, the process proceeds to S06. If not, the process returns to S04, and S04 and S05 are repeated until it is determined that the 5th group lens L5 has moved to the 5th group origin position.

In S06, the control unit 90 drives the STM 6 to move the 6-group frame 60 (6-group lens L6) to the 6-group initial position. As described above, the initial position of the 6th group is the position at the infinite end at the set focal length. For example, when the positions of L1 to L4, the motor sliding cylinders 100, and L7 are set to the wide-angle end state by the zoom ring 81, the control unit 90 has the 6-group lens L6 up to the infinite end position (W∞) of the wide-angle end. Drive the STM6 to move. Proceed to S07.
In S07, the control unit 90 drives the STM5 to move the 5th group frame 50 (5th group lens L5) to the 5th group initial position. The initial position of the 5th group is also an infinite position at the set focal length.
When S07 is executed, the control unit 90 ends the initial operation.
The initial position is the position at the infinite end at the set focal length, but it is not necessarily limited to this. For example, it may be a position on the closest side (for example, the closest end) at the set focal length, or it may be a position between the infinite end and the closest end.

Here, by changing the position (origin position) of the PI, the time required for the initial operation shown in FIG. 16 can be shortened or averaged.

This will be described in detail. FIG. 17 is a diagram for explaining the position of the photo interrupter PI5 for the 5th group on the optical axis OA and the position of the photointerruptor PI6 for the 6th group. Hereinafter, the 5th group and the 6th group will be described together. In FIG. 17, the close-end (TN) position of the telephoto end of the 5-group lens L5 and the close-end (TN) position of the telephoto end of the 6-group lens L6 are shown at the same positions in the optical axis direction. Is different. The TN position of the 5th group lens L5 is on the front side (subject side, object side) in the optical axis direction from the TN position of the 6th group lens L6.
When the shooting distance is changed while the focal length is at the telephoto end, L5 and L6 move between the near end (TN) position at the telephoto end and the infinite end (T∞) position at the telephoto end. When the shooting distance is changed while the focal length is at the wide-angle end, L5 and L6 move between the close end (WN) position at the wide-angle end and the infinite end (W∞) position at the wide-angle end.
Therefore, L5 and L6 are arranged at any position between TN and W∞ when the power is turned on in S1 of FIG.
Therefore, if the photo interrupter PI5 (or PI6) is placed at an arbitrary position within the movement range of the 5th group frame 50 (or 6th group frame 60) from TN to W∞, the time required for the initial operation is shortened or averaged. can do. Although FIG. 17 shows an example in which the closest end is closer to the subject than the infinite end, the infinite end may be closer to the subject than the closest end. In this case, the photo interrupter PI5 (or PI6) may be arranged at an arbitrary position within the movement range of the 5 group frame 50 (or 6 group frame 60) from T∞ to WN.

Hereinafter, the positions of the photo interrupters PI5 or PI6 will be described in three different forms.

(1) The photo interrupter is arranged at the position shown in (1) in FIG.
That is, the photo interrupter PI5 or PI6 is arranged between the infinite end (T∞) position at the telephoto end and the infinite end (W∞) position at the wide-angle end. In other words, the PI5 (or PI6) is arranged at an arbitrary position within the movable range of the 5-group lens L5 (or 6-group lens L6) when the focal length is changed when the shooting distance is infinity. The 5th group frame 50 (or the 6th group frame 60) is detected. As a result, the time required for moving from the origin position to the initial position can be shortened. Further, the photo interrupter PI5 or PI6 may be arranged at the center of T∞ and W∞. In other words, the PI5 (or PI6) is arranged at the center within the movable range of the fifth lens L5 (or the sixth group lens L6) when the focal length is changed when the shooting distance is infinity. The 5 group frame 50 is detected. The central portion does not have to be strictly the central portion, and may be displaced back and forth to some extent. For example, it may be arranged within the middle range when T∞ to W∞ are divided into three equal parts. Alternatively, it may be arranged within a range including a predetermined length (for example, 3 mm in front and 3 mm in back) from the central portion to the front and back.
In this case, the time for moving L5 or L6 from the origin position to the initial position can be averaged regardless of the set focal length.
Although FIG. 17 shows an example in which the closest end is closer to the subject than the infinite end, the infinite end may be closer to the subject than the closest end.

(2) The photo interrupter is arranged at the position shown in (2) of FIG.
That is, the photo interrupter PI5 or PI6 is arranged near (near) the infinite end (T∞) position of the telephoto end. In other words, the PI5 (or PI6) is arranged near the position where the 5th group frame 50 (or the 6th group frame 60) is arranged when the shooting distance is the infinite end and the focal length is the telephoto end. The vicinity of T∞ does not have to be exactly the T∞ position, and may be shifted back and forth to some extent. For example, it may be arranged within a range including a predetermined length (for example, 3 mm in front and 3 mm in back) from the T∞ position.
For example, if the lens barrel has the shortest length when the focal length is at the telephoto end, the photographer shortens the lens barrel 2 when not shooting (for example, when the power is off). It is considered that there are many cases where the lens is in the telephoto end. In this case, since it is considered that the power is turned on at the telephoto end, the initial position is likely to be T∞. Therefore, if the PI5 or PI6 is placed at the position (T∞) shown in (2), the origin position and the initial position are the same, so that the time for moving the L5 or L6 from the origin position to the initial position can be shortened. Can be done. Further, even if the state of the lens barrel 2 when the power is turned on is not at the telephoto end, if it is on the telephoto side, the origin position and the initial position are close to each other, so that the time required to move L5 or L6 from the origin position to the initial position is increased. Can be shortened. As a result, the time for the initial operation of the camera 1 as a whole can be shortened.

Further, the position of L5 or L6 when the power of the camera body 3 is turned on (the position of L5 or L6 in S01 of FIG. 16) is the range in which L5 or L6 can move (TN in FIG. 17 as an example). To W∞). That is, when the power is turned on, the control unit 90 must move L5 or L6 from any position in the movable range of L5 or L6 to the position (origin position) of the photo interrupter PI5 or PI6. Therefore, if the PI5 or PI6 is arranged at the position shown in (2), the time required from the power ON to the origin position detection can be averaged or shortened. In the case of a lens having a movable range such as L6, the photo interrupter may be arranged at the center of the movable range instead of near T∞. Similar to the above, the central part does not have to be exactly the central part.
Although FIG. 17 shows an example in which the closest end is closer to the subject than the infinite end, the infinite end may be closer to the subject than the closest end. In this case, the photo interrupter PI5 or PI6 may be arranged at the nearest end (TN) position of the telephoto end.

(3) The photo interrupter is arranged at the position shown in (3) of FIG.
That is, the photo interrupter PI5 or PI6 is arranged near the infinite end (W∞) position of the wide-angle end. In other words, the PI5 (or PI6) is arranged at the position where the 5th group frame 50 (or the 6th group frame 60) is arranged when the shooting distance is the infinite end and the focal length is the wide-angle end. The vicinity of W∞ does not have to be exactly the W∞ position, and may be shifted back and forth to some extent. For example, it may be arranged within a range including a predetermined length (for example, 3 mm in front and 3 mm in back) from the W∞ position.
For example, if the lens barrel has the shortest length when the focal length is at the wide-angle end, the photographer shortens the lens barrel 2 when not shooting (for example, when the power is off). It is considered that the wide-angle end is often set. In this case, since it is considered that the power is turned on at the wide-angle end, the initial position is likely to be W∞. Therefore, if the PI5 or PI6 is placed at the position (W∞) shown in (3), the origin position and the initial position are the same, so that the time for moving the L5 or L6 from the origin position to the initial position can be shortened. Can be done. Further, even if the state of the lens barrel 2 when the power is turned on is not at the wide-angle end, if it is on the wide-angle side, the origin position and the initial position are close to each other, so that the time required to move L5 or L6 from the origin position to the initial position is increased. It can be shortened. As a result, the time for the initial operation of the camera 1 as a whole can be shortened.

Both PI5 and PI6 may be arranged in the above (1) to (3), or one of them may be arranged in the above (1) to (3).

Further, in the above description, the example in which the infinite end position at the set focal length is set as the initial position has been described, but the present invention is not limited to this. For example, the position at the nearest end may be the initial position. In that case, (1A) PI is placed between TN and WN. More specifically, the PI is arranged in the central range between the TN and the WN. (2A) PI is placed in the vicinity of TN. (3A) PI is placed near WN. Etc. are conceivable.
Further, as described in (2) above, the PI may be arranged at a position where an arbitrary position within the movable range of the lens can be detected. In other words, in the PI5 (or PI6), the 5th group lens L5 (or the 6th group lens L6) is arranged at an arbitrary position (origin position) within the movable range of the 5th lens L5 (or the 6th group lens L6). Detect that it has been done. For example, an arbitrary position may be the central portion within the movable range of the 5-group lens L5 (or the 6-group lens L6). Similar to the above, it does not have to be exactly in the center.
Although FIG. 17 shows an example in which the closest end is closer to the subject than the infinite end, the infinite end may be closer to the subject than the closest end. In this case, the movable range of the 5-group lens L5 or the 6-group lens L6 is from the close to the wide-angle end to the infinity at the telephoto end.

(6. Remove backlash)
Returning to FIG. 2, the backlash removal of the motor sliding cylinder 100 will be described. As shown in the figure, a coil spring 171 is arranged as an elastic member between the rear end surface of the motor sliding cylinder 100 in the optical axis OA direction and the front end surface of the guide bar pressing member 170. The front end surface of the guide bar holding member 170 may be flat. A tension spring or other pressing member may be used instead of the coil spring 171. Further, in FIG. 2, the rear end of the motor sliding cylinder 100 is spring-loaded, but the present invention is not limited to this. A spring or a pressing member may be arranged between the front end (front surface) of the motor sliding cylinder 100 and the four group frames.
By urging the motor sliding cylinder 100 in the optical axis direction by the coil spring 171, the influence of backlash can be reduced. Since the cam pin 101 is pressed against the side surface of the peripheral groove 83a of the inner cam cylinder 83 to remove backlash, the motor sliding cylinder 100 can be positioned in the optical axis OA direction with high accuracy. That is, since the cam pin 101 is pressed against one side of the week groove (cam groove) 83a of the inner cam cylinder 83 by the coil spring 171, play can be removed.
Further, as shown in FIG. 2, the cam pin 101 and the coil spring 171 are arranged along the optical axis direction on a plane parallel to the optical axis. As a result, the positions of the cam pin 101 and the coil spring 171 in the circumferential direction coincide with each other, so that the urging can be performed efficiently. A plurality of cam pins 101 and coil springs 171 may be provided. For example, three sets may be arranged along the circumferential direction.

It has been described that the 5th group lens L5 and the 6th group lens L6 move in the optical axis direction by the STM, but the present invention is not limited to this. For example, another group of lenses may be moved in the optical axis direction by STM.

Although it has been described that the motor sliding cylinder 100 moves in the optical axis direction in mechanically interlocking with the zoom ring 81, the present invention is not limited to this. For example, a motor for rotating the outer cam cylinder 82 or the inner cam cylinder 83 is provided, and the outer cam cylinder 82 or the inner cam cylinder 83 is rotated by the motor during zooming or focusing, and the motor sliding cylinder 100 is moved in the optical axis direction. It may be configured to move.

STM5, STM6, PI5, and PI6 are fixed to the motor sliding cylinder 100. By fixing the components for driving the 5-group lens L5 and the 6-group lens L6, which are the focus lenses, to one cylinder in this way, an error such as backlash between the 5-group lens L5 and the 6-group lens L6 is generated. It is less likely to occur. Therefore, higher performance focus control can be performed.

Further, since the motor sliding cylinder 100 can be moved in the optical axis direction, the 5th group lens L5 and the 6th group lens L6 can be moved more in the optical axis direction without lengthening the STM lead screw. it can. Specifically, the 5th group lens L5 and the 6th group lens L6 move in the optical axis direction by the motor sliding cylinder 100 and the STM. As a result, the lead screw of the STM can be shortened as compared with the case where the 5th group lens L5 and the 6th group lens L6 are moved only by the STM. Therefore, play can be reduced due to the lead screw falling over.

L1: 1 group lens, L2: 2 group lens, L3: 3 group lens, L4: 4 group lens, L5: 5 group lens, L6: 6 group lens, L7: 7 group lens, OA: optical axis, PI5: 5 Group photo interrupter, PI6: 6 group photo interrupter, STM5: 5 group motor, STM6: 6 group motor,
1: Camera, 2: Lens barrel, 3: Camera body, 4: Image sensor,
11: 1 group frame, 12: 1 group sliding cylinder, 21: 2 group frame, 31: 3 group frame,
41: 4 group frame, 43: 4 group holding part, 44: front wall part, 45: cylinder part, 45a: straight groove, 42: diaphragm unit, 42a: STM for diaphragm,
50: 5 group frame, 51: 5 group holding part, 52: 5 group hood part, 52a: shading line,
60: 6 group frame, 61: 6 group holding part, 62: 6 group hood part, 62a: shading line, 65: notch,
70: 7 group frame, 71: 7 group holding part, 72: 7 group hood part, 72a: shading line, 73: 7 group sliding cylinder,
81: Zoom ring, 82: Outer cam cylinder, 83: Inner cam cylinder, 83a: Circumferential groove, 84: Outer fixed cylinder, 84a: Photo interrupter, 85: Inner fixed cylinder, 86: Focus ring, 86a: Reflective tape, 86b : Shading line, 88: Main board, 90: Control unit, 91: 1st connecting pin, 92: 2nd connecting pin,
100: Motor sliding cylinder, 101: Cam pin, 151: Main guide bar, 152: Sub guide bar, 161: Main guide bar, 162: Sub guide bar, 170: Guide bar holding member, 171: Coil spring,
500: 5 group lens drive unit, 501: unit frame, 501a: unit fixing part, 501b: fixing part, 501c: lead screw holding part, 502: lead screw, 503: moving rack, 504: meshing part, 505: engaging part Shaft part, 505a: Rear small diameter part, 505b: Medium diameter part, 505c: Large diameter part, 505d: Front small diameter part, 506: Coil spring 510: Protruding part, 511: Main guide bar engaging part, 511a: Front wall , 511b: Rear wall, 511c: Side wall, 511d: Side wall, 511e: Guide bar insertion hole, 512: Shading part, 513: Rack engaging part, 513a: Front arm, 513b: Rear arm, 513d: Through hole, 513e: Through hole, 552: Sub guide bar engaging part, 560: Projection,
600: 6-group lens drive unit, 610: protruding part, 611: main guide bar engaging part, 611a: front wall, 611b: rear wall, 612: light-shielding part, 622: main guide bar engaging part, 652: sub-guide Bar engagement part

Claims (11)

The first lens holding frame that holds the first lens and
A first drive unit that moves the first lens holding frame in the optical axis direction,
A first guide bar that guides the first lens holding frame in the optical axis direction,
A second guide bar that regulates the rotation of the first lens holding frame, and
A second lens holding frame that holds the second lens and
A second drive unit that moves the second lens holding frame in the optical axis direction,
A third guide bar that guides the second lens holding frame in the optical axis direction,
A fourth guide bar that regulates the rotation of the second lens holding frame is provided.
The first drive unit is arranged closer to the first guide bar than the second guide bar in the circumferential direction centered on the optical axis.
The second drive unit is a lens barrel that is arranged closer to the third guide bar than the fourth guide bar in the circumferential direction centered on the optical axis. The lens barrel according to claim 1, wherein the first guide bar, the second guide bar, the third guide bar, and the fourth guide bar are arranged on concentric circles about the optical axis. Aperture blade and
A third drive unit for driving the diaphragm blades is provided.
The lens barrel according to claim 1 or 2, wherein the first drive unit, the second drive unit, and the third drive unit are arranged in this order in the circumferential direction about the optical axis. The lens barrel according to claim 3, wherein the first drive unit, the second drive unit, and the third drive unit are arranged apart from each other in the circumferential direction about the optical axis. The lens barrel according to claim 4, wherein the first drive unit, the second drive unit, and the third drive unit are arranged at substantially equal intervals in the circumferential direction about the optical axis. The lens barrel according to any one of claims 3 to 5, wherein the first drive unit, the second drive unit, and the third drive unit move in the optical axis direction. The lens barrel according to any one of claims 1 to 6, further comprising a first cylinder provided with the first drive unit and the second drive unit. Equipped with a second cylinder that rotates around the optical axis
The lens barrel according to claim 7, wherein the first cylinder moves in the optical axis direction as the second cylinder rotates. The lens barrel according to any one of claims 1 to 8, wherein the first drive unit or the second drive unit is a stepping motor. The lens barrel according to any one of claims 1 to 9, wherein the first lens and the second lens are focus lenses. An imaging device including the lens barrel according to any one of claims 1 to 10.

Images