JPH08338935A - Lens barrel - Google Patents

Abstract

PURPOSE: To provide a lens barrel improved in a rotation restriction mechanism for restricting the rotating range of an operation ring and capable of easily incorporating a cushioning member. CONSTITUTION: The lens barrel is provided with the rotatable operation ring 100, an interlocking member 110 integrated with the ring 100 in a rotating direction, a restriction part 122 restricting the rotation of the interlocking member 110 and the cushioning member 130 installed on the interlocking member 110 and set for absorbing impact received by the interlocking member 110 from the restriction part 122. The interlocking member 110 is provided with an opening part 118 piercing through a part where the cushioning member 130 is installed. The cushioning member 130 is provided with a groove part 131 where the interlocking member 110 is installed and which is parallel with an optical axis, and a projection part 132 provided in the groove part 131 and inserted into the opening part or the hole part of the interlocking member 110. Then, at least one part thereof is arranged between the interlocking member 110 and the ring 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel, and more particularly to a rotation limiting mechanism for an operating ring which makes a rotational movement about an optical axis.

[0002]

2. Description of the Related Art Conventionally, this type of lens barrel has a rotation limiting mechanism for limiting a rotation range of a focus ring (operating ring) for performing a focusing operation. As an example of this rotation limiting mechanism, a cutout portion (restriction portion) provided on the inner peripheral surface of the fixed barrel corresponding to the rotation range of the focus ring, and an inner peripheral surface of the focus ring, which is integrated with the focus ring. And a key member (interlocking member) that moves in the rotational direction, and a part of the key member is inserted into the cutout portion. In this mechanism, when the focus ring is rotated, the key member comes into contact with the circumferential end surface of the cutout portion, and the rotation of the focus ring is restricted.

Here, since the key member and the fixed cylinder are made of metal or synthetic resin, when the key ring collides with the end face of the cutout when the focus ring is rotated all the way, an impact noise and Vibration was occurring. Especially, in the automatic focusing mode in which the rotation of the focus ring is high speed, the impact sound at that time is loud and the user is uncomfortable. Further, the vibration generated at that time is also considerably large, and is transmitted to various mechanical parts of the lens barrel. Therefore, in the conventional lens barrel, in order to reduce impact noise and vibration generated at the time of collision, the interlocking member is made of an elastic material such as rubber and is attached to the focus ring with a small screw or the like. Alternatively, the interlocking member formed of metal or the like is covered with an elastic material.

[0004]

However, in the above-described conventional lens barrel, when the interlocking member is formed of the elastic material as described above, the interlocking member is installed on the focus ring with a machine screw or the like. When doing, there was a problem that it was difficult to fix it firmly. Moreover, if the method of adhering the interlocking member to the focus ring without using a small screw, or using a metal or the like as the interlocking member and adhering an elastic body thereto, the efficiency of the assembly work of the lens barrel becomes poor. Along with the problem, there is a problem in that the elastic body may peel off due to the change with time of the adhesive material, resulting in poor reliability.

Therefore, an object of the present invention is to solve the above-mentioned problems, improve the rotation limiting mechanism for limiting the rotation range of the operating ring, and provide a lens barrel in which a buffer member can be easily incorporated. .

[0006]

In order to solve the above-mentioned problems, the present invention provides an operating ring (1) rotatable about an optical axis.
00), an interlocking member (110) installed integrally with the operation ring in the rotation direction, a restricting part (122) for restricting rotation of the interlocking member, and an interlocking member installed on the interlocking member and restricting the interlocking member. A lens barrel including a shock absorbing member (130) that absorbs an impact received when its rotational movement is limited by the interlocking member, and the interlocking member has a hole (118) penetrating a portion where the shock absorbing member is installed. Or a hole that does not penetrate (11
9), and the buffer member includes a groove portion (131) installed in the interlocking member and parallel to the optical axis, and a projection portion (132, 133) provided in the groove portion and inserted into the hole portion or the hole portion of the interlocking member. And at least a part thereof is arranged between the interlocking member and the operation ring.

[0007]

According to the present invention, the operating ring rotates about the optical axis, and the interlocking member rotates integrally with the operating ring in the rotational direction. Further, the limiting unit limits the rotation of the interlocking member within a certain range. On the other hand, the cushioning member absorbs a shock received when the interlocking member is restricted in its rotation by the restricting portion. When the cushioning portion is installed on the interlocking member, the groove portion of the cushioning member prevents the cushioning member from moving relative to the interlocking member in the circumferential direction about the optical axis. Further, the protrusion of the cushioning member and the hole or hole of the interlocking member prevent the cushioning member from moving relative to the interlocking member in the optical axis direction. Furthermore, the interlocking member and the operation ring prevent the buffer member from moving in the radial direction around the optical axis.

[0008]

EXAMPLES Examples will be described below with reference to the drawings.
This will be described in more detail. FIG. 1 is a view showing an embodiment according to the present invention, and FIG. 1 (A) is a sectional view showing a zoom lens barrel according to the present embodiment when each lens group is pulled rearward. Further, FIG. 1B is a partial side view of the key member used in this embodiment. As shown in FIG.
The present invention includes a fixed barrel 10, a cam ring 20, four lens moving frames 30, 40, 50 and 60, a focus relay barrel 7.
0, a zoom ring 80, a focus ring 100 and the like.

The fixed barrel 10 is a frame for supporting the cam ring 20 and other components, and a rear portion 11 having a mount portion 12 for mounting the lens barrel on the camera body.
And a large-diameter portion 13 and a medium-diameter portion 15 which are located in front of the rear portion 11 and whose central axes coincide with the optical axis of the lens barrel.
And have.

The large-diameter portion 13 is a portion for supporting the zoom ring 80, the focus ring 100 and the like on the outer peripheral surface and the tip portion thereof. The large-diameter portion 13 has three notches 120 on the outer peripheral surface of the tip portion 126, and
A circumferential groove 121 that is adjacent to the cutout portion 120 and that surrounds the large-diameter portion 13 is provided behind the cutout portion 120. Notch 1
20 and the peripheral groove 121 are the focus ring 10 described later.
It is an attachment part for attaching 0 to the fixed cylinder 10 by the bayonet method. Further, as shown in FIG. 7 or FIG. 8, the large diameter portion 13 is provided with a notch 122 on the inner peripheral surface thereof and a clearance groove 125 adjacent to the notch 122 behind the notch 122. Here, FIG. 7 is a view showing the shape of the fixed barrel 10 and the like when the lens barrel is viewed from the direction of the arrow at the position J in FIG. 1, and FIG. 8 is a similar view at the position K. . The notch 122 and the escape groove 125 are
This is for controlling the rotation of the key member 110 described later.

The intermediate diameter portion 15 is a portion for supporting the cam ring 20, the third lens group moving frame 50, etc., and the inner peripheral surface of the cam groove 17 and the guide groove 1 parallel to the optical axis.
6 is provided. The guide groove 16 is for guiding the third lens group moving frame 50 so as to prohibit the rotational movement about the optical axis and to perform only the back-and-forth movement along the optical axis when adjusting the focal length. is there. On the other hand, the cam groove 17 is for defining the position of the cam ring 20 in the optical axis direction.

The cam ring 20 receives the driving force from the zoom ring 80, and the four lens moving frames 30, 40, 50,
It is for driving 60. The cam ring 20
Three annular bodies having the same central axis, that is, the large diameter portion 21,
It is composed of a medium diameter portion 24 and a small diameter portion 25. Large diameter part 21
The middle diameter portion 24 and the small diameter portion 2 at the rear end portion.
5 are connected to each other at the tip, and 1 as a whole
It is a member. Therefore, the cross section of the cam ring 20 seen in the figure has a shape in which the S-shape and the inverted S-shape face each other around the optical axis. The cam ring 20 has a small-diameter portion 25 so that the outer peripheral surface thereof fits with the inner peripheral surface of the medium-diameter portion 15 of the fixed barrel 10, and the large-diameter portion 21 and the medium-diameter portion 24 of the fixed barrel 1.
It is arranged in the lens barrel so as to be located between the large diameter portion 13 of 0 and the medium diameter portion 15.

The large diameter portion 21 of the cam ring 20 is provided with a guide groove 22 on its inner peripheral surface which is parallel to the optical axis for transmitting the rotational movement of the cam ring 20 to the first group lens moving frame 30. On the other hand, a pin 23 is installed at the rear end of the outer peripheral surface. Pin 2
The reference numeral 3 penetrates an escape groove 14 provided in the fixed barrel 10, and the tip end thereof is fitted into a guide groove 81 provided in the inner peripheral surface of the zoom ring 80 in parallel with the optical axis. As a result, the cam ring 20 receives the driving force in the rotational direction from the zoom ring 80 via the pin 23 and the guide groove 81.

The small diameter portion 25 of the cam ring 20 has three cam grooves 26, 27 and 28. The cam groove 26 is
A cam groove for defining the position of the fourth lens group moving frame 60 in the optical axis direction. The cam ring 20 and the fourth lens group moving frame 60 are engaged with each other via the cam groove 26 and the cam pin 63. On the other hand, the cam groove 27 is a cam groove for defining the position of the third lens group moving frame 50 in the optical axis direction. The cam groove 27 is fitted with the tip of a cam pin 54 that penetrates an escape groove 64 provided in the fourth lens group moving frame 60 in parallel with the optical axis. Here, the cam pin 54 is installed in the third lens group moving frame 50, and the rotational movement of the cam ring 20 is converted into a rectilinear movement in the optical axis direction by the cam groove 27 and the cam pin 54, so that the third lens group moving frame is moved. 50 is transmitted. The cam groove 28 is for defining the position of the second group lens moving frame 40 in the optical axis direction. In the cam groove 28, the cam pin 42 is provided on the outer peripheral surface of the second lens group moving frame 40 and penetrates the clearance groove 57 of the third lens group moving frame 50 and the clearance groove 65 of the fourth lens group moving frame 60. Are fitted to each other, which allows the driving force in the optical axis direction to be transmitted to the second lens group moving frame 40. Furthermore, the small diameter portion 2
5, the cam pin 29 is installed on the outer periphery of the rear end,
The cam pin 29 has a tip end portion thereof in the cam groove 17 of the fixed barrel 10.
Is fitted to. As a result, the cam ring 20 moves in the optical axis direction in the lens barrel in accordance with the shape of the cam groove 17.

The first group lens moving frame 30 is a frame body for positioning the first group lens L1 in the optical axis direction. The first group lens moving frame 30 supports the first group lens L1 on the inner peripheral surface of the front end portion thereof, and also the first group lens L1.
The cylindrical portion 31 is provided behind the portion supporting the. The length of the cylindrical portion 31 in the optical axis direction is equal to the length of the large diameter portion 21 of the cam ring 20, and is equal to the length of the first group lens moving frame 30 described later relative to the cam ring 20 in the optical axis direction. Further, the cylindrical portion 31 has the cam groove 3 on the inner peripheral surface.
2 and pins 33 on the outer periphery of the rear end portion. A cam pin 56 installed on the outer peripheral surface of the third lens group moving frame 50 is fitted into the cam groove 32 at its tip end.
As a result, when the first lens group moving frame 30 rotates, the first lens group moving frame 30 and the third lens group moving frame 50 are moved.
Makes relative movement in the optical axis direction. Further, the tip end of the pin 33 is fitted into the guide groove 22 of the cam ring 20. Therefore, the first group lens moving frame 30 is transmitted with the driving force in the rotational direction about the optical axis from the cam ring 20 to the first group lens moving frame 30 via the pin 33, and the optical signal is transmitted to the cam ring 20. It is possible to make relative movement smoothly in the axial direction.

The second group lens moving frame 40 is a frame body for positioning the second group lens L2 in the optical axis direction. The second group lens moving frame 40 has a second group lens L2 on its inner peripheral surface.
And a cam pin 42 is installed on the outer peripheral surface of the rear end portion. As described above, the cam pin 42 is fitted in the cam groove 28 of the cam ring 20. Therefore, when the cam ring 20 moves in the optical axis direction or rotates about the optical axis, the second lens group moving frame 40 moves the cam groove 28.
And is driven in the optical axis direction via the cam pin 42.

The third group lens moving frame 50 is a frame body for positioning the third group lens L3 in the optical axis direction, and is composed of three parts of a rear end portion 51, a cylindrical portion 52 and a front end portion 55. The rear end portion 51 has a third lens group L on its inner peripheral surface.
3, and a cam pin 54 is installed on the outer peripheral surface thereof. The cam pin 54 is used for the fourth lens group moving frame 6
The clearance groove 64 of 0 and the cam groove 27 of the cam ring 20 are penetrated, and the tip end thereof is inserted into the guide groove 16 of the fixed barrel 10. Therefore, the third group lens moving frame 50 is prohibited from rotating in the lens barrel by the guide groove 16, and only moves in the optical axis direction.

The cylindrical portion 52 is fitted on the outer peripheral surface of the second group lens moving frame 40 on the inner peripheral surface thereof, and is also a clearance for passing the cam pin 42 installed on the second group lens moving frame 40. The groove 57 is provided. Further, the cylindrical portion 52 is provided with a groove portion 53 parallel to the optical axis, and this groove portion 53 has
A protrusion 62 of a fourth lens group moving frame 60, which will be described later, is fitted. A cam pin 56 is provided on the outer peripheral surface of the tip portion 55. As described above, the cam pin 56 is fitted into the cam groove 32 of the first lens group moving frame 30 and has a function of converting the rotational movement of the first lens group moving frame 30 into a movement in the optical axis direction together with the cam groove 32. Is playing.

The fourth group lens moving frame 60 is a frame body which supports the fourth group lens L4 on the inner peripheral surface of the rear end portion.
The fourth group lens moving frame 60 has a cylindrical portion 61 that extends forward from the portion supporting the fourth group lens L4, and has an inner peripheral surface of the cylindrical portion 61 and an outer peripheral surface of the third group lens moving frame 50. It is arranged in the lens barrel so as to be in contact with it. In addition, the cylindrical portion 61 is provided on its inner peripheral surface with a protruding portion 62 which is parallel to the optical axis and has a vertically long shape. As described above, the protrusion 62 is provided in the groove portion 5 provided in the third lens group moving frame 50.
3 is fitted, which allows the fourth lens group moving frame 6
0 is integrated with the third lens group moving frame 50 in the rotation direction about the optical axis. Here, since the third lens group moving frame 50 does not rotate as described above, the fourth lens group moving frame 60 also does not move in the rotation direction. Further, the cam pin 63 is provided on the outer peripheral surface of the rear portion of the cylindrical portion 61.
Is installed, and the tip end of the cam pin 63 is fitted into the cam groove 26 of the cam ring 20. Therefore, the fourth lens group moving frame 60 receives a driving force in the optical axis direction from the cam ring 20 via the cam groove 26 and the cam pin 63.

The focus relay cylinder 70 includes the cam ring 20.
Is a cylindrical member installed on the inner peripheral surface of the medium diameter portion 24,
It is a member that moves relative to both the cam ring 20 and the fixed barrel 10 in the circumferential direction about the optical axis. The focus relay cylinder 70 has a brim portion 73 on the outer peripheral surface of the rear end portion thereof, and is engaged with the groove portion 24 a of the medium diameter portion 24.
Further, the focus relay cylinder 70 has a guide groove 7 parallel to the optical axis.
The cam pin 42 is fitted in the guide groove 71 at its tip. Therefore, the focus relay tube 7
When 0 does not rotate, the guide groove 71 functions as a linear guide groove, and limits the movement direction of the second lens group moving frame 40 to the optical axis direction via the cam pin 42. When the focus relay cylinder 70 rotates, its rotational movement is converted into movement in the optical axis direction by the cam pin 42 and the cam groove 28, and the second lens group moving frame 40 follows the optical axis according to the shape of the cam groove 28. Move in the direction.

The zoom ring 80 is an annular member that is manually rotated when adjusting the focal length, and is rotatably attached to the outer peripheral surface of the large diameter portion 13 of the fixed barrel 10. The zoom ring 80 is provided with a guide groove 81 parallel to the optical axis on its inner peripheral surface. The pin 23 is fitted in the guide groove 81, so that when the zoom ring 80 makes a rotational movement, the cam ring 20 also integrally rotates.

The segment gear ring 90 is a gear member for transmitting a driving force for performing automatic focusing from a camera body (not shown), and is rotatably installed on the inner peripheral surface of the large diameter portion 13 of the fixed barrel 10. There is. The segment gear ring 90 is
A segment gear 91 is provided on its inner peripheral surface, and the segment gear 91 meshes with a drive gear (not shown).
Further, the segment gear ring 90 is provided with a protrusion 92 for transmitting a driving force to a key member 110 described later on the outer peripheral surface thereof.

The focus ring 100 is an annular member made of plastic or the like that is manually rotated when performing a focusing operation. The focus ring 100 is shown in FIG.
Alternatively, as shown in FIG. 6, the protrusion 101 is formed on the inner peripheral surface of the rear end.
Also, a peripheral groove portion 102 adjacent to the protrusion 101 is provided in front of the protrusion 101. Here, FIG. 6 is a view showing the shape of the focus ring 100 when the lens barrel is viewed from the direction of the arrow at the position J in FIG.

The circumferential width of the protrusion 101 is fixed cylinder 1
It is smaller than that of the notch 120 of 0 and the length in the optical axis direction is almost the same as that of the peripheral groove 121 of the fixed barrel 10.
Therefore, when the focus ring 100 is attached to the fixed barrel 10, the protrusion 101 passes through the notch 120 and advances to the circumferential groove 121. When the focus ring 100 is rotated there, the protrusion 101 moves to the circumferential groove 121. Fit in the optical axis direction. In this way, the focus ring 100
Has a structure that is attached to the tip of the fixed barrel 10 by a bayonet method. Further, since the circumferential groove 121 restrains only the movement of the protrusion 101 in the optical axis direction, the focus ring 100 can rotate.

On the other hand, on the inner peripheral surface of the focus ring 100, as shown in FIG.
A key member 11 which is a member for limiting the rotational movement of 0 and transmitting the rotational movement to the focus relay barrel 70.
0 is attached by machine screws 115. here,
FIG. 5 is a diagram showing the shapes of the focus ring 100 and the like when the lens barrel is viewed from the direction of the arrow at the position I in FIG.

The key member 110 is the focus ring 10.
It is composed of a substantially circular annular portion 111 fixed to the inner peripheral surface of 0, and an extending portion 112 extending from the annular portion 111 to the rear of the lens barrel in parallel to the optical axis (FIG. 1 (B)). ). In this embodiment, the key member 110 is formed by pressing a plate material having a predetermined shape so that its end faces 116 and 117 face each other to obtain an annular portion 111 (FIG. 5). As a result, the production cost of the key member 110 can be suppressed to be low as compared with the case where it is produced by cutting or the like.

The outer diameter of the annular portion 111 is substantially equal to the inner diameter of the focus ring 100. Therefore, when the annular portion 111 is inserted into the focus ring 100, the annular portion 111 is fitted to the inner peripheral surface 103 thereof, and the key member 110 is supported by the focus ring 100 without using other fasteners or the like. Further, the outer peripheral surface of the annular portion 111 and the inner peripheral surface 103 of the focus ring 100 have surfaces with little friction with each other, and in the above state, the annular portion 111 is rotated to adjust the position in the circumferential direction. It is possible. Further, after the annular portion 111 is fixed to the focus ring 100 with the machine screw 115, the annular portion 111
Functions as a reinforcing member of the focus ring 100,
The strength of the focus ring 100 made of plastic or the like is increased.

The extending portion 112 is a cutout portion 122 of the fixed barrel 10 when the key member 110 is attached to the lens barrel.
And the notch 12 located in the escape groove 125 (FIGS. 7 and 8).
This is a portion whose movement range in the circumferential direction is limited by 2. That is, when the key member 110 makes a rotational movement in conjunction with the focus ring 100, the extension portion 112 moves in the notch 122 in the circumferential direction, but the movement range is from the end 123 of the notch 122 to the end. It is limited to the part 124.

Further, the extension portion 112 is provided with a guide groove 113 parallel to the optical axis in the central portion thereof. As shown in FIG. 1A, the tip of a cam pin 72 installed on the outer peripheral portion of the focus relay barrel 70 is fitted into the guide groove 113. Therefore, the focus ring 100 can be manually operated.
When is rotated, the rotational movement is transmitted to the focus relay barrel 70 via the key member 110, and the focus relay barrel 70 also rotates. Further, the rotational movement of the focus relay cylinder 70 is converted into the movement in the optical axis direction of the second lens group moving frame 40 via the cam pin 42 and the cam groove 28, and the focusing operation is performed. The guide groove 113 is provided in the focus relay cylinder 7.
Since 0 moves integrally with the cam ring 20 in the optical axis direction, its length in the optical axis direction is equal to the movement amount M of the cam ring 20 in the optical axis direction, which will be described later.

The key member 110 has a groove 114 at its rear end (FIG. 1 (B)).
The projection 92 of the segment gear ring 90 is engaged. As a result, during automatic focusing, the segment gear ring 9
When 0 rotates, the rotation causes the protrusion 92 and the groove 11 to rotate.
4 is transmitted to the key member 110. As a result, the focus relay barrel 70 makes a rotary motion in conjunction with the segment gear ring 90, and the rotary motion is converted into a motion of the second lens group moving frame 40 in the optical axis direction, as described above.
Automatic focusing is performed. At this time, since the focus ring 100 is also interlocked with the key member 110, the operation state of the automatic focusing mechanism can be confirmed from the outside of the lens barrel.

In the cushioning member 130, when the extension 112 moves in the circumferential direction and reaches the end 123 or 124 of the cutout 122 shown in FIG. 7, the extension 112 collides with the end 123 or 124. It is a member that absorbs impact and prevents the generation of impact noise and vibration. The cushioning member 130 is an elastic member such as rubber provided with a groove 131 for inserting the extension 112, and a part of the cushioning member 130 is sandwiched by the extension 112 and the focus ring 100 in the radial direction about the optical axis. It is installed in the extension part 112. In this state, the cushioning member 130 has the hole portion 1 in which the protruding portion 132 provided in the central portion of the groove portion 131 is provided in the extension portion 112.
It is inserted in 18. Therefore, the cushioning member 130 is prohibited from the relative movement in the circumferential direction with respect to the extension 112 by both ends of the groove 131, and is prohibited from the relative movement in the optical axis direction with respect to the extension 112 by the protrusion 132 and the hole 118. Further, since a part of the cushioning member 130 is located between the focus ring 100 and the extension 112, the cushioning member 130 is restricted from moving in the radial direction about the optical axis. In this way, the cushioning member 130 is mechanically fixed to the extension portion 112, and does not come off from the extension portion 112 without using any adhesive or other fixing means.

In this embodiment, the focus ring 100, the key member 110, the notch 122, and the cushioning member 1 are used.
30, the hole portion 118, the groove portion 131, and the protrusion portion 132 are the operation ring, the interlocking member, the limiting portion, the cushioning member, and
It corresponds to the hole of the interlocking member, the groove of the cushioning member, and the protrusion of the cushioning member.

Next, the operation of this embodiment will be described.
FIG. 2 is a view showing a cross-sectional view of the present embodiment, and the lower half of the drawing shows a case where the zoom lens barrel has an optical system arranged for wide-angle image capturing (hereinafter referred to as “wide state”). In addition, the upper half of the figure shows the state when the optical system is arranged for shooting a telephoto image (hereinafter, referred to as “tele state”). 3 and 4 are diagrams for explaining the movement of each lens group in the present embodiment.
Shows a development view of the escape groove 14, the cam groove 32, and the guide groove 81. FIG. 4 shows the guide groove 16, the cam groove 17, the cam groove 26,
The development view of the cam groove 27 and the cam groove 28 is shown. 3 and 4, the left side of the drawing corresponds to the front of the lens barrel, and the alternate long and short dash line F represents a straight line parallel to the optical axis of the lens barrel.

First, the case where focusing is performed in the automatic focusing mode in this embodiment will be described. In the automatic focusing mode, the driving force in the rotational direction is transmitted from the camera body to the segment gear ring 90 shown in FIG. 1 via a known power transmission mechanism (not shown). Next, the driving force is transmitted from the projection 92 to the key member 110, and further from the key member 110 to the focus relay barrel 70 via the cam pin 72 to rotate the focus relay barrel 70. Since the tip portion of the cam pin 42 is fitted in the guide groove 71 of the focus relay cylinder 70, the cam pin 42 is
It rotates in conjunction with the focus relay cylinder 70 and moves in the cam groove 28.

When the lens barrel is in the telescopic state, the cam pin 42 moves up and down on the upper side of the cam groove 28 shown in FIG. The maximum rotation angle of the cam pin 42 at this time is θt, and the amount of movement in the optical axis direction is A. Therefore, the second group lens moving frame 40 also moves within the range of the distance A in the optical axis direction,
Focusing is performed. When the lens barrel of the present embodiment is changed from the telephoto state to the wide state, the cam ring 20 rotates due to an operation described later, so that the cam pin 42 moves to the lower side of the cam groove 28 in the drawing. When the above-described automatic focusing is performed in this state, the cam pin 42 moves in the area of the cam groove 28 indicated by the rotation angle θw equal to the rotation angle θt. As a result, the second group lens moving frame 40 is moved back and forth in the optical axis direction by the length B in the optical axis direction of the area represented by θw, and focusing is performed.

On the other hand, when performing the focusing operation in the manual focusing mode, the focus ring 100 is manually rotated. The rotational movement of the focus ring 100 is transmitted to the key member 110 via the machine screw 115, and thereafter,
By the same mechanism and operation as in the automatic focusing mode,
Focusing is performed by converting the movement of the second lens group moving frame 40 into the optical axis direction.

Next, the operation of this embodiment when adjusting the focal length will be described. In order to simplify the description, the focus relay cylinder 70 will be referred to as the cam ring 2 in the following.
It is assumed that the cam pin 42 does not rotate with respect to 0, and the cam pin 42 performs only the operation related to the focal length adjustment.

In the present embodiment, when the lens barrel is set to the wide state, the zoom ring 80 is rotated clockwise as viewed from the rear of the lens barrel, and its rotational movement is guided by the guide groove 81.
And the pin 23 to the cam ring 20 to rotate the cam ring 20 by the same angle. Zoom ring 80
4 is rotated clockwise, the cam pin 29 in FIG.
Is located at the upper end of the cam groove 17 in the figure. As a result, the cam ring 20 is located at the rearmost position with respect to the middle diameter portion 15 of the fixed barrel 10, and the entire cam ring 20 is housed in the outer barrel of the lens barrel as shown in the lower side of FIG. . Further, the cam pins 42, 54, 63 are respectively provided in the cam groove 2 shown in FIG.
Located at the bottom of 8, 27, 26. Therefore, the second lens group moving frame 40 is located at the frontmost position in the range in which the second lens group moving frame 40 can move relative to the cam ring 20, and conversely, the third lens group moving frame 50 and the fourth lens group moving frame 60 are the most movable. It is located rearward (Fig. 2, lower side).

On the other hand, the pin 23 installed at the rear end of the cam ring 20 is located at the upper end of the clearance groove 14 shown in FIG. 3, that is, at the rear end of the zoom ring 80. On the other hand, the cam groove 32 of the first lens group moving frame 30 shown in FIG. 3 is interlocked with the rotational movement of the cam ring 20, and therefore the cam pin 56.
Is located at its lower end. Therefore, the first lens group moving frame 30 is located at the rearmost position within the range in which the first lens group moving frame 30 can move relative to the cam ring 20, and as shown in the lower side of FIG. The whole 31 is housed in the large-diameter portion 21 of the cam ring 20.

When the zoom ring 80 is rotated counterclockwise from the above state, the lens barrel of this embodiment shifts to the tele state. When the zoom ring 80 is fully turned counterclockwise, the cam pin 29 moves to the lower end of the cam groove 17 shown in FIG. 4 in the figure. As a result, the cam ring 20 is extended forward by the distance M with respect to the medium diameter portion 15 of the fixed barrel 10, and as shown in the upper side of FIG. The part 21 is projected forward. Similarly, the pin 23 moves to the lower end of the escape groove 14 (FIG. 3),
Like the cam ring 20, it moves forward by a distance M and comes to be located at the front end of the zoom ring 80 (FIG. 2).
Since the distance M is set shorter than the length of the large diameter portion 21 in the optical axis direction, the rear end of the large diameter portion 21 is
It is always located behind the tip of the lens barrel.

The cam pins 42, 54 and 63 move to the upper ends of the cam grooves 28, 27 and 26 shown in FIG. 4, respectively. At this time, the second lens group moving frame 40 moves backward by a distance m2 with respect to the cam ring 20, and the third lens group moving frame 50 and the fourth lens group moving frame 60 move forward by m3 and m4, respectively. Moving. Therefore, the distance that each lens moving frame 40, 50, 60 moves with respect to the fixed barrel 10 is M-m2, M + m3, M + m4, respectively.

On the other hand, the cam pin 56 moves to the upper end of the cam groove 32, whereby the first lens group moving frame 30 is extended forward from the second lens group moving frame 40 by a distance m1. In other words, the first lens group moving frame 30 is moved forward by a distance (m1 + m3) from the cam ring 20 and by (M + m1 + m3) from the fixed barrel 10. As a result, as shown in the upper side of FIG. 2, the entire first lens group moving frame 30 is located in front of the outer barrel of the lens barrel. In addition, the engagement position between the first group lens moving frame 30 and the cam ring 20, that is, the position where the pin 33 and the guide groove 22 engage with each other, moves from the rear end of the guide groove 22 to the front end by a series of these operations.

(Other Embodiments) The present invention is not limited to the above embodiments. The above-described embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the claims of the present invention, and any device having the same function and effect can be realized by the present invention. It is included in the technical scope of the invention.

For example, the shapes of the projection 132 and the hole 118 are not limited to the shapes shown in FIG. 1 (B) or FIG. 7. The projections 132 and the holes 118 may have any shapes as long as they can prevent relative movement of the cushioning member 130 and the extension 112 in the optical axis direction. For example, as shown in FIG. May have a shape like the protrusion 133 and the hole 118 may have a shape like the hole 119. 9 is a diagram showing a modification of the key member 110 and the cushioning member 130 according to the present invention.

[0045]

As described above in detail, according to the present invention, the buffer member is only attached to the interlocking member, and the buffer member is circumferentially and radially centered on the optical axis with respect to the interlocking member.
In addition, relative movement in the optical axis direction is mechanically prevented, and it is possible to easily and efficiently incorporate it into the lens barrel without using adhesive or other means for fixing the buffer member to the interlocking member. There is. Further, in the present invention, since the cushioning member is installed on the interlocking member that is the movable portion, the number of the cushioning members may be one even if the interlocking member collides with the limiting portion at two locations. It is possible to reduce the number of parts and the number of lens barrel assembling steps.

[Brief description of drawings]

FIG. 1 is a sectional view of a lens barrel according to the present invention and a partial side view of a key member used in the lens barrel.

FIG. 2 is a sectional view when the lens barrel according to the present invention is in a wide state and a sectional view when it is in a tele state.

FIG. 3 is a development view of a cam groove provided in the lens barrel according to the present invention.

FIG. 4 is a development view of a cam groove provided in the lens barrel according to the present invention, which is different from FIG.

5 is a diagram showing the shape of the focus ring 100 and the like when the lens barrel according to the present invention is viewed from the direction of the arrow at position I in FIG.

6 is a diagram showing the shape of a focus ring 100 when the lens barrel according to the present invention is viewed from the direction of the arrow at position J in FIG.

7 is a diagram showing the shape of the fixed barrel 10 and the like when the lens barrel according to the present invention is viewed from the direction of the arrow at position J in FIG.

8 is a view showing the shape of the fixed barrel 10 and the like when the lens barrel according to the present invention is viewed from the direction of the arrow at position K in FIG.

FIG. 9 is a key member 110 and a cushioning member 130 according to the present invention.
Figure showing a modified example of

[Explanation of symbols]

10 Fixed Cylinder 11 Rear Part 12 Mount Part 13 Large Diameter Part 14 Escape Groove 15 Medium Diameter Part 16 Guide Groove 17 Cam Groove 20 Cam Ring 21 Large Diameter Part 22 Guide Groove 23 Pin 24 Medium Diameter Part 24a Groove Part 25 Small Diameter Part 26 Cam Groove 27 Cam Groove 28 Cam groove 29 Cam pin 30 First group lens moving frame 31 Cylindrical part 32 Cam groove 33 pin 40 Second group lens moving frame 42 Cam pin 50 Third group lens moving frame 51 Rear end 52 Cylindrical part 53 Groove 54 Cam pin 55 Tip Part 56 Cam pin 57 Escape groove 60 Fourth group lens moving frame 61 Cylindrical part 62 Projection part 63 Cam pin 64 Escape groove 65 Escape groove 70 Focus relay cylinder 71 Guide groove 72 Cam pin 73 Flange 80 Zoom ring 81 Guide groove 90 Segment gear ring 91 Segment gear 92 Projection 100 Focus ring 01 Protrusion 102 Circumferential Groove 103 Inner Circumferential Surface 110 Key Member 111 Annular Part 112 Extension Part 113 Guide Groove 114 Groove 115 115 Machine Screw 116 End Face 117 End Face 118 Hole 119 Hole 120 120 Notch 121 Circumferential 122 Notch 123 End 124 End portion 125 Escape groove 126 Tip portion 130 Buffer member 131 Groove portion 132 Protrusion portion 133 Protrusion portion L1 First group lens L2 Second group lens L3 Third group lens L4 Fourth group lens A Second by focusing operation in tele state Optical axis moving distance of group lens moving frame B Optical axis moving distance of second group lens moving frame by focusing operation in wide state F Straight line M parallel to optical axis of lens barrel M Light of cam ring by focal length adjustment Axial movement distance m1 Optical axis movement distance of the first lens group moving frame by focal length adjustment m2 For focal length adjustment The optical axis direction movement distance of the secondary lens group moving frame m3 focal length third lens group moving frame in the optical axis direction movement distance of the fourth lens group moving frame by the optical axis direction moving distance m4 focal length adjustment by adjusting that

Claims (1)

[Claims] 1. An operating ring rotatable about an optical axis, an interlocking member installed on the operating ring so as to be integrated in the rotational direction, and a restricting section for restricting rotation of the interlocking member. A lens barrel that is installed on the interlocking member, and that absorbs a shock received when the interlocking member has its rotational movement limited by the limiting portion, wherein the interlocking member is the cushioning member. Has a hole part that penetrates the site where the is installed or a hole part that does not penetrate, and the buffer member is provided in the groove part parallel to the optical axis installed in the interlocking member, and the interlocking member. The lens barrel, wherein the lens barrel has a hole portion or a protrusion portion to be inserted into the hole portion, and at least a part thereof is arranged between the interlocking member and the operation ring.