JPH09145976A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel capable of housing a flexible printed circuit board which connects a lense frame moving forward and backward and a camera main body, and which is elongated and contracted in a state where much occupied space is not required, and having a high degree of freedom in the design of the lense frame. SOLUTION: This lens barrel is equipped with a moving frame 2, a guide frame 3 straightly advancing with respect to the moving frame 2, a flex presser 40 held by the moving frame 2, and a K flex 38 for electric connection, which is folded back at the edge and constituted so that the outside of its folded part is fixed on the presser 40 and a loop part is formed inside, and the K flex 38 performs elongation/contraction action by moving the loop part through the notched part 2h of the moving frame 2 in the case the lense frame is moved to advance/retreat.

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 lens barrel having a movable lens frame, in which a connecting flexible printed circuit board is arranged. Regarding

[0002]

2. Description of the Related Art Conventionally, a zoom lens barrel disclosed in Japanese Unexamined Patent Publication No. 5-249360 as a zoom lens barrel of a multi-stage extension type has a large zoom magnification and the total length of the lens barrel when stored is short. It is a lens barrel characterized by that. In this lens barrel, a flexible printed circuit board (hereinafter, referred to as an FPC) that absorbs expansion and contraction of a lens frame that is driven back and forth in order to electrically connect a lens frame in which a shutter drive actuator is incorporated and a camera body is electrically connected. (Described) is connected between the lens frame and the camera body.

[0003]

However, in the structure of the zoom lens barrel disclosed in the above-mentioned Japanese Patent Laid-Open No. 5-249360, in order to incorporate the FPC for electrical connection, it is necessary to bend the FPC. The required large space is required, and the outer shape of the lens barrel section becomes large. It is also necessary to provide an opening in the lens frame to provide a space for passing the FPC,
The degree of freedom of the lens frame structure is limited.

In view of the above problems, according to the present invention, an expandable and flexible flexible printed circuit board for connecting between a lens frame moving forward and backward and a camera body is properly stored in a lens barrel with a small occupied space. It is an object of the present invention to provide a lens barrel having a high degree of freedom in designing a lens frame and having a high lens frame accuracy.

[0005]

According to a first aspect of the present invention, there is provided a lens barrel comprising: a first lens frame; and an inner circumference of the first lens frame. A second lens frame that advances straight in the optical axis direction with respect to the lens frame, an extension member that is held by the first lens frame and extends substantially parallel to the optical axis direction, and is folded back 180 degrees at the tip of this extension member. At least the outer side of the folded-back portion is fixed to the extension member, and the flexible printed circuit board has the loop portion formed inside. In the lens barrel, a part of the first lens frame is cut out, the extension member is arranged in the cutout portion, and the flexible printed circuit board held by the extension member is
As the lens frame moves forward and backward, the loop portion moves through the cutout portion to absorb the forward and backward movement of the lens frame.

According to a second aspect of the present invention, in the lens barrel, the lens barrel is fitted to the first lens frame and the inner circumference of the first lens frame so that the first lens frame is optically protected. Second straight ahead in the axial direction
A lens frame, a third lens frame that is fitted to the inner circumference of the second lens frame, is configured integrally with the second lens frame in the optical axis direction, and is rotated around the optical axis, and the third lens frame. An extension member held by the second lens frame at the inner circumference of the frame and extending substantially parallel to the optical axis direction, and one end fixed to the extension member, and a loop portion formed at the other end side in the optical axis direction. And a flexible printed circuit board. In the lens barrel, the loop forming position of the flexible printed circuit board moves as the lens frame advances and retracts to absorb the lens frame advance and retreat.

The lens barrel according to claim 3 of the present invention comprises, in the lens barrel, a lens frame which is moved forward and backward in the optical axis direction with respect to the camera body, and a rear portion of the lens frame to the vicinity of the film aperture of the camera body. A light-shielding member that covers the light-shielding member, one end of which is held by the rear portion of the lens frame and the other end of which is held by the camera body outside the lens frame, and which is an intermediate portion of these holding portions. And a flexible printed circuit board curved so as to draw a loop. In the lens barrel, the loop formed on the flexible printed circuit board absorbs the change in the distance between the camera body and the lens frame.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 17 perspective views,
The configuration of the lens barrel according to the embodiment of the present invention will be described with reference to sectional views and the like.

1 and 2 are exploded perspective views of the lens barrel of the present embodiment, and FIGS. 3, 12 and 13 are vertical sectional views of the lens barrel in a wide state, a tele state and a retracted state, respectively. In the figure, FIG. 14 is a cross-sectional view of a cross-section in another direction in the collapsed state. 4 to 8 are partially enlarged views. 9 and 10 are a front view seen from the subject side and a rear view seen from the film side, respectively, in the wide state of the lens barrel, and FIG. 11 is a view seen from an arrow A in FIG. 15 and 16
FIG. 3 is a development view of the moving frame of the lens barrel and the cam frame in a wide state and a tele state seen from the inner peripheral side. FIG. 17 is an exploded perspective view of a K-flex, which is a flexible printed circuit board for electrical connection, and a K-flex retainer incorporated in the present lens barrel.

As shown in the exploded perspective views of FIGS. 1 and 2, the lens barrel is mainly disposed between the retracted position, which is the storage position, and the projecting position, at which the B main body 13 is the camera main body. A moving frame 2 as a first lens frame that can move forward and backward through the first region, a rotary frame 1 as an outer frame for zooming that is rotatable with respect to the moving frame 2, and the rotary frame 1 And a cam frame 5 as a third lens frame which is driven to rotate by the cam of the moving frame 2 and is moved forward and backward simultaneously with the cam frame 5 while being guided by the moving frame 2 and not rotating. Two
A guide frame 3 as another lens frame, and a first Z-frame (fourth lens frame) as a fourth lens frame which is driven by the cam of the cam frame 5 and is moved back and forth by being guided by the guide frame 3 in the rotation direction. 1 zoom frame) 4, an S main body (shutter main body) 22 that moves back and forth integrally with the first Z frame 4, and a lens holding frame that is supported by the first Z frame 4 and supports the first group lens that is a photographing lens. The first lens frame (first group frame) 20 and the S body 22 are slidably supported by the fourth lens frame that is driven by the cam of the cam frame 5 to move forward and backward and supports the second lens group, which is a photographing lens. And a 2G frame (second group frame) 24 that is a lens holding frame. 1 and 2, C1 to C
The reference numeral 14 indicates the fitting relationship between the pin, the cam and the frame.

In the lens barrel of the present invention, the electric connection between the B main body 13 side, which is the camera main body, and the S main body 22 side, which moves forward and backward, must be bent and deformed as shown in FIGS. Is performed by the K-flex 38 which is a flexible printed circuit board that absorbs the forward / backward movement. The K flex 38 will be described in detail later.

The detailed structure of the lens barrel will be described below. In the description of the lens barrel, the operation of feeding the movable frame 2 of the lens barrel and the rotary frame 1 from the retracted position, which is the storage position, to the projecting position where the shooting is possible is referred to as the setup operation, and from the projecting position to the retracted position. The operation of rolling in is referred to as a set-down operation, and the setup or set-down is referred to as a set operation. Further, the operation of rotating the rotary frame 1 to perform zooming in the wide state or the tele state is referred to as a zoom operation.

The above-mentioned setup or set-down operation for moving the moving frame 2 to and from the retracted position and the projected position is
The feed screw 3 of the feed screw mechanism is set by the set operation gear of the camera drive mechanism through the lens frame side set gear 34 shown in FIG.
6 is rotated to move the moving plate 7 along the optical axis. Then, in the wide-angle state in which photographing is possible, the lens barrel is driven to the set-up state by the feed screw 36.

Further, in the rotation of the rotary frame 1 for the above zoom operation, the zoom gear of the drive mechanism drives the connecting gear portion 28b through the zoom system gear train so that the rotating gear 1 is integrated with the connecting gear 28b. Therefore, the lens frame side zoom gear 28 having a spur gear shape long in the axial direction corresponding to the movement of the first region is provided.
Is rotated, and the rotary frame 1 meshing with it is driven.

The moving plate 7 driven by the feed screw mechanism is provided with a sleeve mounting screw portion 7b and a nut mounting portion 7c, as shown in a partially enlarged view around the feed screw in FIG. The sleeve 32 and the nut 33 are attached. A suspension shaft 35 is fitted to the sleeve 32, and a feed screw 36 is screwed to the nut 33. One of the suspension shaft 35 and the feed screw 36 is attached to the B main body 13 at its shaft end portion. 35a and 36b are fitted together, and the other is rotatably supported by a pressing plate (hanging shaft, feed screw pressing plate) 31. The pressing plate 31 is attached to the B main body 13. The set gear 34 is attached to the feed screw 36a in a state in which the rotation is restricted,
When the set gear 34 is rotationally driven, the feed screw 36 rotates.

The moving plate 7 is screwed to the moving frame 2 at four places, and the moving frame 2 is provided with a boss 2a for stopping rotation with the B main body 13 and is provided in a groove of the B main body. 13a is fitted (see FIG. 10). When the set gear 34 is rotationally driven by a power transmission mechanism driven by a gear 48 of the drive mechanism (not shown) on the way, the feed screw 36 rotates and the moving plate 7 and the moving frame 2 move in the front-rear direction. become. When the moving frame 2 is extended to the shooting position, the sleeve 32 contacts the pressing plate 31 (see FIG. 4).

The rotating frame 1 is rotatably fitted on the outer peripheral side of the moving frame 2. There is a bayonet groove 1e at the front part of the rotary frame 1, and two bayonet claws 2c of the moving frame 7 prevent the movable frame 7 from coming off in the thrust direction. A gear portion 1a is provided at the rear portion of the rotary frame 1 and meshes with the lens frame side zoom gear 28. The zoom lens 28 on the lens frame side is long in the vertical direction, and is constantly set from set up to set down.
It meshes with the rotary frame gear portion 1a. The finder gear 37 shown in FIG. 9 meshes with the gear portion 1a of the rotary frame 1 and drives a finder optical system (not shown).

A guide frame 3 is fitted on the inner peripheral side of the moving frame 2, and a guide frame rotation stopping convex portion 3d is fitted in the moving frame rotation stopping groove 2b. It is designed to drive straight ahead. 1Z on the inner peripheral side of the guide frame 3.
The frame 4 is fitted, and the three rotation stopper protrusions 4a are slidably fitted in the rotation stopper grooves 3b of the guide frame 3, and the 1Z frame 4 is It is designed to drive straight ahead.

A cam frame 5 is rotatably fitted on the inner peripheral side of the 1Z frame 4. Further, three holes are arranged behind the 1Z frame 4 so that the 1Z pin 6 can be inserted from the inner diameter side. The three 1Z pins 6 are fitted in the bottomed cam grooves 5a of the three curved cam grooves cut on the outer peripheral side of the cam frame 5, respectively.

Behind the cam frame 5 are three cam followers 9
A cam pin 9 having a, 9b, 9c is fixed at a fitting portion 5c by a cam rotation 8 while its rotation is restricted. Also,
Behind the cam frame 5, a hole 5f for inserting the retaining ring 10
4 are in place, the projections of the retaining ring with tapped holes are inserted, and screws are fastened with the retaining ring mounting holes 8b at 4 places of the cam turning member 8. 2 on the stop ring 10
The bayonet claws 10a and 10b at the places are protruded in the outer peripheral direction, and between the bayonet receiving portion 3c of the guide frame 3,
The thrust of the guide frame 3 is regulated.

There are three cam followers 9 on the cam pin 9.
a, 9b, 9c are provided, and each of them is a moving frame 2
The cams 2d (bottomed), 2e (hole) and 2f (bottomed) are fitted together. Further, an L-shaped power transmission claw 8a projects from the vicinity of the cam follower 9b for the cam turning, penetrates the cam 2e (hole), and the cam turning key groove 1 of the rotary frame.
b.

Now, assuming that the power of the rotary frame 1 is transmitted from the wide position in the CW (clockwise) direction when viewed from the front (subject side), the rotation of the rotary frame 1 causes the cam rotation 8a to rotate the cam rotation 8a. , Cam followers 9a, 9 of the cam pin 9
Rotational force is applied to b, 9c, the cam frame 5, and the stop ring 10. Then, the cam followers 9a, 9b, 9c of the cam pin 9 are
Then, the cams 2d, e, and f of the moving frame perform rotational movement.

On the other hand, the thrust of the cam frame 5 is regulated, and the rotatable guide frame 3 is regulated to rotate with respect to the moving frame 2. Therefore, the amount of straight movement of the cam frame 5 is the same. Only the amount moves straight ahead with respect to the moving frame 2. 1
The Z frame 4 has three 1Z pins 6 fitted to the cam frame 5,
In addition, since the rotation of the guide frame 3 is restricted, when the cam frame 5 rotates, the 1Z frame 4 becomes the guide frame 3.
On the other hand, drive straight ahead.

A light shielding rubber L16 is provided on the front portion 1c of the rotary frame 1.
However, light-shielding rubber S17 is attached to the front portion 3a of the guide frame, respectively, and has a waterproof structure. The front part of the 1Z frame 4 has three S frames (shutter frames).
The mounting hole 4d is opened, and a built-in object including the S lid 21 is mounted with a screw. The 1Z frame 4 is covered with a 1Z ornament 18 for hiding screws and the like.

The 1G frame 20 holds four lenses for the first group. The focusing bearing portion 20a includes
A focusing shaft (not shown) is fitted, and the shaft is sandwiched between the S lid 21 and the S body 22,
Focusing can be performed by a focus motor (not shown). In addition, in the front part of the 1G frame 20,
The 1G light shield 19 is attached at the mounting portion 19b,
The 1G light shield 19 is in contact with the 1Z frame 4 at the contact portion 19a and constitutes a waterproof structure.

At the rear of the S main body 22, there are sector blades, which are held by a blade retainer 23. The shutter operation is performed by a drive source (not shown) provided in the S body 22. In addition, the S lid 21 has a 2G spring shaft 26.
Is fixed, and the 2G spring 27 is fitted on the 2G spring shaft 26.

The 2G frame 24 holds two lenses for the rear group. When viewed from the back of the 2G frame 24, on the lower right side,
There is a hole 24f for fixing the 2G shaft 25b. The 2G shaft 25b is fitted in the sleeve portion 22c of the S body 22. Further, in the opposite direction, the 2G guide 25a is fixed in the 2G guide hole 24a and serves as a rotation stopper for the U of the S body.
It fits in the character-shaped guide portion 22b. Also, 2G spring 2
7 is in contact with the periphery of the escape hole 24c, and the 2G frame 24
Is moved back and forth with respect to the S body 22 and is urged toward the film surface by a 2G spring 27.

In the vicinity of the 2G shaft mounting portion of the 2G frame 24, the first
Wide side cam follower 24d as a cam follower,
Tele side cam followers 24e as first cam followers are provided, and cam grooves 5e and 5d of the cam frame 5 are provided, respectively.
Has been fitted. The cam grooves 5e and 5d are bottomed grooves of straight cam grooves formed on the inner peripheral side of the cam frame 5. 2G frame 2
Since 4 is biased by the 2G spring 27, the cam followers 24d, 24e are in contact with the rear end sides of the cam grooves 5e, 5d.

In this lens barrel, the 2G frame 24 includes the wide side cam follower 24d and the tele side cam follower 24.
The structure for restricting the wide or tele feed amount by switching any one of e is described below. The switching operation of the wide side cam follower 24d and the tele side cam follower 24e will be described below.

When the lens frame is at the wide position, the wide side cam follower 24d is engaged with the second group cam groove 5e of the cam frame 5 as shown in the development view of FIG. 15, while the tele side cam follower 24e is provided. Is a cam groove 5d for the second group of the cam frame 5.
Is out of. When zooming in the tele direction from this state and the cam follower 24e is applied to the entry portion of the cam groove 5e, the cam follower 24d reaches the switching point 5g of the cam groove 5e and escapes from the cam groove 5e. , No longer contact. After the point 5g, as shown in the development view of FIG. 16, until the telescopic state, the tele-side cam follower 24e is guided by the cam groove 5d to perform zooming. Since the inclinations of the second group cams 5e and 5d of the cam frame 5 are steeper than those of the first group cam 5a, as the wide state changes to the telescopic state,
The distance between the first and second lens groups becomes smaller.

Next, the driving operation of the lens frame from the W (wide state) position to the retracted position will be described. First, the rotary frame 1 of the lens barrel in the W state is rotated about 10 ° in the CCW direction by the zoom gear 28 when viewed from the front. This state is W '
And At this time, the guide frame 3 and the 1Z frame 4 are moved back and forth in the optical axis direction by the cam follower 9 fixed to the cam frame 5.
Since a, 9b, and 9c are in the flat portions of the cams 2d, 2e, and 2f of the moving frame 2 and the pin 6 of the 1Z frame 4 is also in the flat portion of the cam 5a of the cam frame 5, the positions of the 1Z frame 4 are different. There is no change. Then, as shown in the development view of FIG. 15, the wide-side cam follower 24d and the tele-side cam follower 24e move from the position in the W state to the position in the W'state, respectively, and the 2G frame 2
No. 4 does not move in the optical axis direction because the cam 5e of the cam frame 5 is flat.

Next, when the feed screw 36 shown in FIG. 4 is rotated to bring the lens barrel into the retracted state, the entire lens barrel is retracted toward the film side. The 2G frame 24 is provided with a collapsible stopper 24b projecting rearward,
Shortly after moving from the W'state in the collapsing direction, the collapsing stopper 24b comes into contact with the bellows plate 12 (see FIG. 13 for the abutting state). Further, the 2G frame 24 is not retracted due to the contact of the stopper 24b with the bellows 12, but the 2G spring 27 is charged and the interval between the 1Z frame 4 and the 2G frame 24 is narrowed. The intervals are getting smaller and smaller. Then, as shown in FIG. 4, when the sleeve 32 comes into contact with the bellows plate 12, it is in a collapsed state, that is, a set-down state. The sectional view of FIG. 13 shows the collapsed state.

During the collapsing operation, the W-side cam follower 24d of the 2G frame 24 enters the cam groove 5b extending in the optical axis direction of the cam frame 5 and the gap between the 1Z frame 4 and the 2G frame 24 is narrowed. Is possible. Further, a mounting portion 11a of a bellows 11 as a light shielding member is attached to the film side of the moving plate 2, and a mounting portion 11b of the bellows 11 is attached to a bellows plate 12 fixed to the B main body. In the set-up state of the lens frame, it extends as shown in FIG. 3, and in the set-down state, it is folded as shown in FIG. The purpose of arranging this bellows 11 is B
This is to prevent harmful rays from wrapping around the aperture of the main body 13.

Set up and set in the sensor mounting portion 13d of the B main body 13 on the left side when viewed from the front of the lens frame.
A sensor 14 which is a PR element (photoreflector) for detecting the down and zoom positions is attached (see FIGS. 3 and 9). On the other hand, at the rear side of the rotary frame 1 and at the front position on the gear side, the W'in the extended state.
At the position facing the sensor 14, the reflection seal 1
5 is attached, and the position of the lens frame is detected using reflected light.

The position detecting operation will be described below with reference to the sensor detection state development diagrams of FIGS. 18 to 20 and the sensor output signal time chart of FIG. 21. First, in the set-down state, FIG. The sensor 14 is positioned with respect to the rotary frame 1 as shown in the development view of 18, and the output signal of the sensor 14 is "low" as shown in FIG. When the feed screw 36 is driven and the moving frame 2 and the like are drawn out, the reflection seal 15 moves to the sensor 14 as shown in FIG.
, And the output signal of the sensor 14 changes to “high”. A pulse counter is provided in the drive motor, and the rotation angle of the rotary frame 1 is detected. When the sensor output signal changes to high, the voltage of the drive motor is controlled so that the drive motor is slowly fed.

When the sleeve 32 comes into contact with the pressing plate 31 as shown in FIG. 4, no pulse is generated, so the drive motor is stopped. Subsequently, the clutch is switched by the electromagnet 40, and the drive system of the drive motor is connected to the lens frame side zoom gear 28. Next, when the drive motor is driven, the zoom gear 28 is rotated so that the zoom gear 28 is driven from the W'state to the W state (wide state). However, the stop control to wide is performed by setting the reflection seal 15 at the position facing the sensor 14. The output signal goes from "high" to "low" apart from and is performed by the pulse counter of the drive motor.

When zooming between W (wide) and T (tele) with a zoom button (not shown) on the main body 13 side, each zoom position is detected by a pulse counter.

Next, when retracting from the zoom position, when the sensor signal goes from wide to high from low to high, the voltage of the drive motor is controlled and the rotary frame 1 slowly moves to W'counterclockwise. Move around. When the rotary frame 1 comes to the position W ', there is a stopper for the lens frame, the pulse of the pulse counter is no longer output, and the drive motor stops. Subsequently, the clutch is switched by an electromagnet (not shown) to connect the drive system of the drive motor to the state in which the set gear 34 is driven, that is, the feed screw 36 side.

Then, when the drive motor is driven, the feed screw 36 rotates to start set down. Sensor 14
When the output signal of is changed from high to low, pulse counting is started, the voltage of the drive motor is controlled slightly before the completely retracted position, and it is slowly applied to the retracted end.
When it hits, the pulse stops and the motor stops.

When the rotary frame 1 is unnecessarily rotated in the collapsed state, the W side cam follower 24d of the 2G frame 24 may hit the wall of the groove 5b of the cam frame 5 and be damaged. Therefore, when retracted, as shown in the sectional view of FIG.
3 is provided with a protrusion-shaped rotation stopper 13c as a locking means of the rotary frame 1 so as to be fitted in the collapsed rotation stopper groove 1d of the rotary frame 1 so that it cannot rotate unnecessarily. At the time of set-up, the rotation stop 13c is pulled out in the optical axis direction and is disengaged, so that the rotary frame 1 can freely rotate.

Next, the K flex 38 which is a flexible printed circuit board for electrical connection between the B body (camera body) 13 side and the shutter etc. built in the S body (shutter body) 22 will be described with reference to FIGS. 10, FIG. 11, FIG. 12, and FIG.
3, description will be made with reference to FIG. 15, FIG. 16, FIG. As described above, this lens barrel has a setup operation and a zoom operation by two-stage extension. In order to supply power or to transmit signals to electric components such as the sector actuating actuator, focusing drive actuator, and sensor in the S main body 22, the K flex 38 is attached to the B main body 13
It is connected between the side and the S body 22. The K flex 38 needs to freely expand and contract by the setup operation and the zoom operation.

Therefore, in the present lens barrel, in a limited space, a part of the lens frame is cut out to form the K flexible 38.
The above-described expansion and contraction operation is possible by bending and arranging it by 0 °, and its configuration will be described below with reference to FIG. 3 and the like.

First, the blade presser 23 is arranged at the rear of the S-phone tie 22 with the sector interposed therebetween. Blade press 23
A doughnut-shaped shutter inner wiring portion 38i of the K flex 38 is attached to the rear portion of the K flexible 38, and is wired to each of the actuators. A projection 23a partially protrudes from the rear portion of the blade retainer 23, and the protrusion 23a is wrapped around 180 ° and is fixed and held to the blade retainer fixing portion 38a by adhesion or the like. After that, it extends forward and draws a loop at the second loop portion 38d and is inverted.

A second flexible presser 39 is provided as a second extension member for fixing the K flexible 38 at the inverted end. The second flexible presser 39 is fixed to the rear portion of the rotation stopping convex portion 3d of the guide frame 3 and moves integrally with the guide frame 3. Then, the K flexible 38 is the second
It is fixed to the second flexible presser 39 by the flexible presser fixing portion 38b.

The K flex 38 is looped again at the first loop portion 38e and is inverted, and extends forward.
A first flexible retainer 40 is provided as a first extension member for fixing the flexible portion at the inverted position. The first flexible presser 40 has a movable plate 7 at the rear of the movable frame 2.
It is sandwiched and fixed, and is housed in the flexible housing notch 2h of the movable frame 2, and its tip is held together with the K flex 38 by the pawl stopper 2g which is a locking claw for preventing protrusion. .

The K flex 38 is bent 180 ° at the tip of the first flexible press 40, and the first flexible press fixing portion 3 is provided.
It is fixed at 8g. Further, the K flex 38 passes through the moving frame fixing portion 40a, extends toward the aperture direction outside the bellows 11, and is inverted by drawing a loop at the third loop portion 38f. The K flex 38 is fixed to the B main body 13 by the fixing portion 38c at the tip of turning over.

As described above, the K flex 38 has the second loop 38d, the first loop 38e, and the third loop 38f, and the differential of the 1Z frame 4 and the guide frame 3 by zooming, and the guide frame 3 by zooming, respectively. The position of each loop moves in response to the differential, setup, and down (collapsible) movements of the moving frame 2.

That is, the second loop 38d moves toward the blade presser fixing portion 38a side from the wide side to the tele side. Further, the first loop 38e moves toward the 180-degree turn-back portion 38h side from the wide side to the tele side. Further, the third loop 38f moves to the moving frame fixing portion 40a side of the first flexible presser as the setup state changes to the collapsed state.

As described above, according to the connecting K-flex in the lens barrel of this embodiment and the fixed support structure thereof, the K-flex 38 is formed with the first, second, and third loops. The K flex 38 smoothly bends and differentials even when each lens frame moves back and forth, and moreover, it is contained within a narrow range where the occupied space is limited and does not enter the optical path of the photographing light. You can Further, the K flex 38 includes a second flex holder 39 and a first flex holder 4.
Since it is firmly held at 0, there is no risk of contact with the lens frame. Furthermore, since the third loop f is outside the bellows 11, there is no fear of causing internal reflection.

(Appendix) According to the embodiment of the present invention as described in detail above, the following constitution can be obtained. That is, (1) in the lens barrel, a first lens frame and a second lens frame that is fitted to the inner circumference of the first lens frame and moves straight in the optical axis direction with respect to the first lens frame; An extension member that is held by the first lens frame and extends substantially parallel to the optical axis direction, and 1 at the tip of the extension member.
A flexible printed circuit board which is folded back 80 degrees, at least the outer side of which the folded back portion is sandwiched is fixed to the extension member, and a loop portion is formed inside.
A lens barrel, wherein a part of the first lens frame is cut out, and the extension member is arranged in the cutout portion.

(2) In the above (1), a locking claw for preventing the extension member from protruding is provided in the cutout portion of the first lens frame.

(3) In the above (1), a part of the flexible printed circuit board opposite to the folded-back portion sandwiching the loop portion is fixed to the second lens frame.

(4) In (3) above, inside the loop portion, the second lens frame has a rear end position of the second lens frame in the optical axis direction substantially coincide with the rear end of the first lens frame. When moved in such a manner, the rear end face of the second lens frame comes into contact with the rear end face.

(5) In the above (1), the loop portion is curved so that the tip thereof faces forward along the optical axis direction.

(6) In the above item (1), the second lens frame moves back and forth in the optical axis direction with respect to the first lens frame as the lens barrel zooms.

(7) In the above (1), the first lens frame is a fixed frame which is moved from a state of being housed in the camera body to a state of protruding by a predetermined amount when the camera is used.

(8) In the lens barrel, the first lens frame and
The second lens frame fitted to the inner circumference of the first lens frame and moving straight in the optical axis direction with respect to the first lens frame, and the second lens frame fitted to the inner circumference of the second lens frame, A second lens frame which is integrally formed with the second lens frame in the optical axis direction and which is rotated around the optical axis, and which is held by the second lens frame at the inner periphery of the third lens frame and is substantially in the optical axis direction. A lens barrel comprising: an extension member extending in parallel; and a flexible printed board having one end fixed to the extension member and a loop portion formed on the other end side in the optical axis direction.

(9) In the above (8), the second lens frame moves back and forth in the optical axis direction with respect to the first lens frame as the lens barrel zooms.

(10) In the lens barrel, a lens frame that moves forward and backward with respect to the camera body in the optical axis direction, a light shielding member that covers the rear portion of the lens frame to the vicinity of the film aperture of the camera body, and the light shielding member It is arranged outside, one end is held at the rear part of the lens frame, the other end is held by the camera body outside the lens frame, and the holding part is curved so as to draw a loop at an intermediate part. A lens barrel comprising: a printed circuit board.

(11) In the above (10), the lens frame is
When the camera is used, it is advanced so as to protrude from the camera body.

(12) A flexible printed circuit board which is disposed in the lens barrel so as to extend in the optical axis direction and has at least three loop portions in an intermediate portion.

(13) In the lens barrel, a first lens frame and a second lens frame which is fitted to the inner circumference of the first lens frame and moves straight in the optical axis direction with respect to the first lens frame. A first extension member that is held by the first lens frame and extends substantially parallel to the optical axis direction, a second lens frame that advances and retracts in the optical axis direction with respect to the first lens frame, and the second lens frame. A fourth lens frame fitted to the inner circumference of the second lens frame and moving straight in the optical axis direction with respect to the second lens frame; A third lens frame which is integrally formed in the axial direction and is rotated around the optical axis, and a second lens frame which is held by the second lens frame at the inner circumference of the third lens frame and extends substantially parallel to the optical axis direction. The extension member is folded back 180 degrees at the tip of the first extension member, at least the outer side sandwiching the folded back portion is fixed to the first extension member, and the first loop portion is formed inside and A flexible printed circuit board in which a tip of the loop portion is fixed to the second extension member, and a second loop portion is further formed at a tip opposite to the first loop portion sandwiching the fixed portion; A lens barrel, wherein a part of the first lens frame is cut out, and the first extension member is arranged in the cut out portion.

(14) In the above (13), the first
A locking claw for preventing the extension member from protruding is provided in the notch portion of the lens frame.

(15) In the above (13), a part of the flexible printed circuit board on the opposite side of the folded portion sandwiching the first loop portion is fixed to the second lens frame.

(16) In the above (15), the first
The inner side of the loop portion is the second lens frame when the second lens frame is moved so that the rear end position of the second lens frame in the optical axis direction substantially coincides with the rear end of the first lens frame. Abut the rear end face.

(17) In the above (13), the first
The loop portion is curved so that its tip faces forward along the optical axis direction.

(18) In the above (13), the second
The lens frame moves back and forth in the optical axis direction with respect to the first lens frame as the lens barrel zooms.

(19) In the above item (13), the third item
The lens frame advances and retracts in the optical axis direction with respect to the second lens frame as the lens barrel zooms.

(20) In the above (13), the first
The lens frame is a fixed frame that is moved from a state of being housed in the camera body to a state of protruding by a predetermined amount when the camera is used.

[0070]

As described above, according to the lens barrel of the first aspect of the present invention, a part of the first lens frame is cut out, and the flexible printed circuit board is arranged to pass through the notch. , The formation of the loop portion due to the expansion and contraction operation of the flexible printed circuit board is well regulated, the occupied space becomes small, and the degree of freedom in the lens frame design increases, and
It also enables downsizing of the lens barrel.

According to the lens barrel of the second aspect of the present invention, the degree of freedom in the construction of the lens frame can be increased by passing the extension member for fixing the flexible printed circuit board inside the rotating third lens frame. In addition, it is possible to obtain a reliable expansion and contraction operation of the flexible printed circuit board.

Further, in the lens barrel according to the third aspect of the present invention, since the loop portion of the flexible printed board is formed on the outer side of the light shielding member, there is no fear of occurrence of internal reflection by the flexible printed board.

[Brief description of the drawings]

FIG. 1 is a part of an exploded perspective view of a lens barrel of the present invention.

FIG. 2 is a part of an exploded perspective view of the lens barrel of FIG.

3 is a sectional view of the lens barrel of FIG. 1 in a wide state.

FIG. 4 is a partially enlarged cross-sectional view of a feeding drive unit of the lens barrel of FIG.

5 is a partially enlarged cross-sectional view of a portion showing a mounting state of the S lid of the lens barrel of FIG. 1 on a 1Z frame.

6 is a partially enlarged cross-sectional view of a shaft suspension portion of the lens barrel in FIG.

7 is a partially enlarged cross-sectional view of a support portion of a feed screw of the lens barrel of FIG.

8 is an enlarged view showing a cam follower arrangement state of a 2G frame of the lens barrel in FIG.

9 is a sectional view of the lens barrel of FIG. 1 in a wide state as seen from the front side (subject side).

10 is a cross-sectional view of the lens barrel of FIG. 1 in a wide state as seen from the back side (film surface side).

FIG. 11 is a view taken in the direction of arrow A in FIG. 10, showing a state in which K flex and flex press are arranged.

12 is a sectional view of the lens barrel of FIG. 1 in a telephoto state.

13 is a sectional view of the lens barrel of FIG. 1 in a retracted state.

14 is a cross-sectional view around a second group spring axis, which is different from the cross-sectional portion in FIG.

15 is a development view of a moving frame and a cam frame in a wide state of the lens barrel of FIG.

16 is a development view of a moving frame and a cam frame in a telephoto state of the lens barrel in FIG.

FIG. 17 is an exploded perspective view of the K-flex for electrical connection and the flex-presser incorporated in the lens barrel in FIG.

18 is a development view showing a sensor detection state when the lens barrel of the camera with a zoom lens in FIG. 1 is retracted.

FIG. 19 is a development view showing a sensor detection state when the rotary frame of the lens barrel in FIG. 1 is at the W ′ position.

20 is a development view showing a sensor detection state when the rotation frame of the lens barrel in FIG. 1 is at the W (wide) position.

21 is a time chart of a sensor output signal of the lens barrel of FIG.

[Explanation of symbols]

 2 ... Moving frame (first mirror frame) 2h ... Notch 3 ... Guide frame (second lens frame) 5 ... Cam frame (third lens frame) 11 ... Bellows (light-shielding member) 38 ... K Flexible (flexible printed circuit board) 38d, 38e, 38f ... Loop portion 39 ... Second flexible presser (extending member) 40 ... First flexible presser (extending member)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyohiko Kimura 2-34-2 Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Co., Ltd.

Claims (3)

[Claims] 1. A lens barrel, comprising: a first lens frame; and a second lens frame that is fitted to the inner circumference of the first lens frame and moves straight in the optical axis direction with respect to the first lens frame. An extension member that is held by the first lens frame and extends substantially parallel to the optical axis direction, and is folded back 180 degrees at the tip of this extension member, at least the outer side of which the folded-back portion is sandwiched is fixed to the extension member, and the inner side A flexible printed circuit board having a loop portion formed therein, wherein a part of the first lens frame is cut out, and the extension member is arranged in the cutout portion. 2. A lens barrel, comprising: a first lens frame; and a second lens frame that is fitted to the inner circumference of the first lens frame and moves straight in the optical axis direction with respect to the first lens frame. A third lens frame which is fitted to the inner circumference of the second lens frame and is integrally formed with the second lens frame in the optical axis direction, and which is rotated around the optical axis; and an inner circumference of the third lens frame. An extension member held by the second lens frame and extending substantially parallel to the optical axis direction, and a flexible printed circuit board having one end fixed to the extension member and a loop portion formed at the other end side in the optical axis direction. A lens barrel comprising: 3. In the lens barrel, a lens frame that moves forward and backward in the optical axis direction with respect to the camera body, a light-shielding member that covers the rear portion of the lens frame to the vicinity of the film aperture of the camera body, and the outside of this light-shielding member. , A flexible print curved at one end thereof is held by the rear portion of the lens frame, the other end thereof is held by the camera body outside the lens frame, and curved so as to draw a loop at an intermediate portion of these holding portions. A lens barrel comprising: a substrate;