JPS624686B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens barrel used in still cameras, cine cameras, television cameras, etc., which allows focus adjustment either automatically or manually.

Conventionally proposed lens barrels capable of automatic and manual focus adjustment have been proposed, for example, as shown in Japanese Patent Application Laid-open No. 151144/1983 published on December 4, 1975. An operating member such as a distance ring that is operated to adjust the focus and a lens group that is to be moved for focus adjustment are connected via a helicoid mechanism,
A drive member driven by the automatic focus adjustment device was detachably connected to the operating member.
However, in such conventional devices, the connection between the operating member and the lens group and the holding of the lens group are performed using a structure similar to that of a lens that can only be manually adjusted, so there are problems with optical axis tilting and wobbling. Although sufficient accuracy is guaranteed, since the lens group is driven via a helicoid mechanism with a large drive torque even during automatic focus adjustment, a large driving force is required for the automatic focus adjustment device, and control accuracy may be affected due to inertia etc. In addition, the drive member of the automatic focus adjustment device is connected to the operating member disposed outside the lens barrel, so the drive member passes through the outside of the lens barrel in the optical axis direction. In addition, the connecting portion between the drive member and the operating member also protrudes outside the lens barrel, making the lens barrel bulky and detracting from its appearance, and in some cases making it difficult to manually adjust the focus. The drawback was that it could get in the way.

In view of the above-mentioned drawbacks of the conventional device, the applicant of the present application has filed a patent application filed on November 25, 1973.
No. 145503, a second moving member for moving a lens group to be moved for focus adjustment is fitted in a sleeve to a first moving member connected to a manual operation member via a helicoid mechanism, and further, 1st
By providing a means for restricting the movable member to move only in a straight line in the optical axis direction, during manual focus adjustment, the first and second moving members are integrally moved in a straight line in the optical axis direction, thereby performing dynamic focus adjustment. When the first moving member is
After fixing the second movable member in a position that does not impede its straight movement in the optical axis direction, the pin installed in the second movable member is pressed by a cam that rotates under the control of the automatic focus adjustment device. proposed a lens barrel capable of automatic manual focus adjustment in which only the second moving member is moved in the optical axis direction.

However, in such a device, during automatic focus adjustment, the second moving member is moved in the optical axis direction by a cam rotating under the control of the automatic focusing device pressing a pin of the second moving member. Therefore, when moving the lens group over a range from the cemented focus position to the infinity focus position, for telephoto lenses and macro lenses that have a large movement distance, the above cam is installed over a wide range to move the lens group over a wide range. It was necessary to rotate the cam a lot. However, cameras with automatic exposure control mechanisms generally have an aperture linking pin located at the rear of the lens barrel to transmit the aperture setting information of the lens barrel to the camera body.
Since the rotation angle of the above-mentioned cam is limited,
Telephoto lenses, macro lenses, and the like that require a large amount of lens group movement for focusing have the disadvantage that automatic focus adjustment over the entire focusing distance range is difficult.

The present invention relates to an improvement of the device proposed in Japanese Patent Application No. 53-145503 as mentioned above, and its purpose is to perform manual focus adjustment in the same way as with the photographing lens of a conventional single-lens reflex camera. It is an object of the present invention to provide a lens barrel capable of automatic manual focus adjustment, which is capable of moving the lens group by a large amount even though the output amount for driving the lens group of the automatic focus adjustment device is small during automatic focus adjustment. be.

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 4 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a partial longitudinal sectional view showing an automatic focus adjustment state, and FIG. 3 is a manual focus adjustment state. FIG. 4 is a partial longitudinal cross-sectional view showing the adjusted state, and FIG. 4 is an exploded perspective view of essential parts of this embodiment.

In FIG. 1, reference numeral 4 denotes a fixed barrel, and a linear key 18 that fits into a linear groove 20c of a second lens group holding barrel 20, which will be described later, is fixed to the fixed barrel 4.
At a predetermined circumferential position at the front end of the fixed barrel 4 in the optical axis direction, there is a recess 4a into which a focus ring rod pawl 10b of an automatic manual focus adjustment switch button 10, which will be described later, can fit.
is formed. In this embodiment, when the focus ring 2, which will be described later, is set to the infinity focusing position, the focus ring rod claw 10b is attached to the fixed barrel 4.
The position of the recess 4a is set so that the recess 4a can be fitted into the recess 4a. 6 is a first movable barrel, and the first movable barrel 6 is coupled to the fixed barrel 4 via a helicoid mechanism.

Reference numeral 2 denotes a focus ring for manual focus adjustment, and the focus ring 2 is integrally connected to the first movable barrel 6. Furthermore, focus ring 2
includes a switching button support part 2a that supports an automatic manual focus adjustment switching button 10, which will be described later, so as to be movable in a direction perpendicular to the optical axis, and a hole through which the head 10a of the automatic manual focusing switching button 10 passes. 2b is provided. Further, on the outer periphery of the focus ring 2, there is a switch button cover 12 for holding the automatic manual focus adjustment switch button 10 in a pressed state.
It is rotatably supported by a shaft 14.

Reference numeral 10 denotes an automatic manual focus adjustment switch button, which is supported by a switch button support part 2a of the focus ring 2 so as to be movable in a direction perpendicular to the optical axis. hole 2b
It is configured to be able to penetrate through and protrude to the outer periphery of the focus ring 2. Furthermore, the above-mentioned fixed barrel 4 is provided at the rear end of the automatic manual focus adjustment switch button 10.
A focus ring lock claw 10b that can be fitted into the recess 4a of the fixed barrel 4 is provided, and when the focus ring lock claw 10b is fitted into the recess 4a of the fixed barrel 4, rotation of the focus ring 2 is locked. It is configured to Further, the automatic/manual focus adjustment switching button 10 is biased in the direction toward the optical axis by a spring 16, and the lower end 10c is configured to be able to press a head 24a of a locking member 24, which will be described later. ing.

A second movable cylinder 8 is connected to the first movable cylinder 6 through a helicoid mechanism. A perspective view of the second movable tube 8 is shown in FIG. 4a. As shown in FIG. 1, on the inner periphery of the second movable cylinder 8,
A pair of pins 8a and 8b are implanted to fit into a pair of cam grooves 20a and 20b, respectively, provided in a second lens group holding cylinder 20, which will be described later. Furthermore,
As shown in FIG. 4a, a groove 8c is provided on the inner circumference of the front end of the second movable barrel 8, into which a rear portion of a locking member 24, which will be described later, can be fitted. A groove 8d into which a drive lever 30, which will be described later, fits is provided on the inner peripheral portion of the rear end.

22 is a first lens group holding cylinder that holds a first lens group that is moved in the optical axis direction for focus adjustment, and 20 is a holding cylinder that holds a second lens group that is moved in the optical axis direction for focus adjustment. In the second lens group holding cylinder, the first lens group holding cylinder 22 and the second lens group holding cylinder 20 are integrally coupled. Further, an automatic lens is provided on the rear outer circumferential surface of the first lens group holding cylinder 22, and is opened and closed by the vertical movement of a locking member 24, which will be described later. A focus power switch 26 is fixed, and an upper contact piece 26a of the autofocus power switch 26 is biased by a spring 28 so as to push up the lock member 24. Note that the force of the spring 28 is set to be stronger than the force of the spring 16 described above, so when the lock member 24 is raised by the spring 28, the automatic manual focus adjustment switch button 10 is also raised. The head 10a is configured to protrude to the outer periphery of the focus ring 2. Furthermore, as shown in FIG. 4b, the first lens group holding cylinder 22 is provided with a locking member 24, which will be described later.
A lock member storage groove 22a is provided for storing the front part of the lock member so as to be movable in the vertical direction in the figure.

Further, the second lens group holding tube 20 is sleeve-fitted with the second movable tube 8 mentioned above, and as is clear from FIG. 4b, the outer peripheral surface of the second lens group holding tube 20 is aligned with the optical axis. A pair of cam grooves 20a, 20b into which the pair of pins 8a, 8b implanted in the second movable cylinder 8 are fitted are formed at symmetrical positions, and the rear end thereof is provided with a pair of cam grooves 20a, 20b. A straight groove 20c into which the straight key 18 fits is formed. Furthermore, the second
At the front of the lens group holding cylinder 20, there is a lock member storage groove 20 in which the rear part of a lock member 24, which will be described later, can be stored.
d is provided.

Returning to FIG. 1, reference numeral 24 denotes a locking member that restricts the relative rotation of the second movable barrel 8 with respect to the second lens group holding barrel 20 as required. It can come into contact with the lower end 10c of the manual focus adjustment switching button 10, and the bottom part 24b comes into contact with one contact piece 26a of the autofocus power switch 26.

With this configuration, when the lock member 24 is raised by the spring 28 as shown in FIG. 8 and the lock member storage groove 20d of the second lens group holding tube 20 in FIG. 4b, the second movable tube 8 and the second lens group holding tube 20 are integrated. are connected to each other. Therefore, in such a state, since the rotational movement of the second lens group holding cylinder 20 around the optical axis is restricted by the straight key 18, the second movable cylinder 8 is also restricted from rotational movement around the optical axis. is regulated.
When the head 10a of the automatic manual focus adjustment switch button 10 is pressed in the state shown in FIG. 24 is lowered into the position shown in FIG. Then, the rear part of the locking member 24 retreats from the groove 8c of the second movable barrel 8 shown in FIG. 4a, so that the second movable barrel 8 and the second lens group holding barrel 2
0 is released, and the second movable cylinder 8 becomes rotatable. At the same time, by lowering the lock member 24, the autofocus power switch 26 is turned on.
is closed, and power is supplied to an automatic focusing device (not shown). Note that an operating switch for the automatic focus adjustment device is provided at an appropriate position on the camera body or lens barrel (not shown).

Reference numeral 30 denotes an autofocus drive lever, which is rotatable around the optical axis under the control of an autofocus adjustment device (not shown), and the tip of the autofocus drive lever 30 is connected to the second movable barrel 8. groove 8d
is fitted. When the autofocus drive lever 30 is rotated around the optical axis under the control of an automatic focus adjustment device (not shown), the second movable barrel 8 is rotated. The length of the groove 8d of the second movable barrel 8 and the length of the tip of the autofocus drive lever 30 are as follows.
It is set in advance so that the tip of the autofocus drive lever 30 always fits into the groove 8d of the second movable barrel 8.

To explain the operation in such a configuration, first, in the manual focus adjustment state, as shown in FIG. 1 or 3, the automatic manual focus adjustment switch button 10 is pressed.
is in the raised position, and the head 10a protrudes to the outer periphery of the focus ring 2. Since the automatic manual focus adjustment switch button 10 is in the raised position, the focus ring lock claw 10b of the automatic manual focus adjustment switch button 10 is retracted from the recess 4a of the fixed barrel 4, and the focus ring 2 is rotatable. be. Further, since the automatic manual focus adjustment switch button 10 is in the raised position, the lock member 24 is also in the raised position without being pressed by the automatic manual focus adjustment switch button 10, and the rear part of the lock member 24 is in the position shown in FIG. 4a. Since it fits into both the groove 8c of the second movable barrel 8 shown in FIG. Rotation of the barrel 8 is restricted, and the second movable barrel 8 and the second lens group holding barrel 20 are integrally coupled.

When the focus ring 2 is rotated in this state, the first movable cylinder 6, which is integrally connected to the focus ring 2, is rotated.
The first movable barrel 6 is moved in the optical axis direction with respect to the fixed barrel to which the first movable barrel 6 is helicoidally coupled. As the first movable barrel 6 rotates, the second movable barrel 8 helicoidally coupled to the first movable barrel 6 is also moved in the optical axis direction relative to the first movable barrel. Since the rotation of the lens 8 is restricted as described above, it can be moved straight in the optical axis direction.
When the second movable barrel 8 is moved straight in the optical axis direction, the second lens group holding barrel 20 is integrally connected to the second movable barrel 8 by the locking member 24;
a first lens group holding tube 22 that is integrally coupled to the second lens group holding tube 20, and a second lens group held by them, respectively;
The first lens group is all moved integrally in the optical axis direction to perform manual focus adjustment.

Next, when switching from manual focus adjustment to automatic focus adjustment, the focus ring 2 is first adjusted to the infinity focus position. Then, as shown in FIG. 1, the focus ring lock claw 10b of the automatic manual focus adjustment switch button 10 comes to a position where it can fit into the recess 4a of the fixed barrel 4, and the lower end of the automatic manual focus adjustment switch button 10 10c is the lock member 24
comes to a position where the head 24a of the head 24a can be pressed. Therefore,
When the automatic manual focus adjustment switch button 10 is pressed and the switch button cover 12 is rotated to maintain the lowered state of the automatic manual focus adjustment switch button 10, the second
As shown in the figure, the automatic manual focus adjustment switch button 10
The focus ring lock pawl 10b fits into the recess 4a of the fixed barrel 4, and the focus ring 2 and the first movable barrel 6 integrally connected thereto are locked into the fixed barrel 4.
be fixed against. At the same time, the locking member 24 is pressed and lowered by the lowering of the automatic manual focus adjustment switching button 10, and the rear part of the locking member 24 retreats from the groove 8c of the second movable barrel 8 to hold the second lens group. Since it is stored in the locking member storage groove 20d of the cylinder 20, the second movable cylinder 8 becomes rotatable.
Further, as the locking member 24 descends, the autofocus power switch 26 is closed, and power is supplied to an autofocus adjustment device (not shown). When the operating switch of an automatic focus adjustment device (not shown) is closed, the autofocus drive lever 30 is rotated around the optical axis under the control of the automatic focus adjustment device, thereby causing the second movable The cylinder 8 is rotated. The second movable barrel 8 is helicoidally connected to the first movable barrel 6, and since the first movable barrel 6 is fixed to the fixed barrel 4, the second movable barrel 8 emits light when rotated. Move in the axial direction. Further, when the second movable barrel 8 is rotated, the pair of pins 8a and 8b implanted in the second movable barrel 8 move into the pair of cam grooves provided in the second lens group holding barrel 20, respectively. 20a and 20b are pressed, the rotation of the second lens group holding cylinder 20 is restricted by the straight key 18, and the second lens group holding cylinder 20 is moved straight in the optical axis direction. When the second lens group holding tube 20 is moved straight in the optical axis direction, the first lens group holding tube 2 which is integrally coupled with the second lens group holding tube 20
2, and the second lens group and first lens group held by them, respectively, are also moved integrally in the optical axis direction to perform automatic focus adjustment.

5, 6, and 7 show other embodiments of the switching means for switching between automatic focus adjustment and manual focus adjustment, FIG. 5 is a longitudinal sectional view thereof, and FIG. 6 is a schematic view thereof. A partial perspective view and FIG. 7 are schematic diagrams illustrating the operation of the switching means. In FIGS. 5 to 7, members that operate in the same manner as in the embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and explanations thereof will be omitted.

5 to 7, reference numeral 32 denotes an automatic manual focus adjustment switching member, and the automatic manual focus adjustment switching member 32 is moved along the outer peripheral surface of the fixed barrel 4 by a guide 36 as shown in FIGS. 6 and 7. It is guided so as to be movable in the direction of arrow A or B in the figure. Furthermore, as is clear from FIG. 6 or 7, at the front of one end of the automatic manual focus adjustment switching member 32,
A cam 32a having different heights in the optical axis direction is formed to press a bent portion 38b at the rear end of the transmission member 38, which will be described later. Focus power switch 2
A protruding portion 32b that can close the opening 6 is formed.
Furthermore, as shown in FIG. 7, on the contact surface of the automatic manual focus adjustment switching member 32 with the fixed barrel 4,
A long groove 32c having a pair of recesses at both ends into which a click pin 34 provided in the fixed cylinder 4 and urged by a spring to protrude to the outer periphery of the fixed cylinder 4 can be fitted.
is formed. With such a configuration, the automatic manual focus adjustment switching member 32 can
can be fixed in the state shown in FIG. 7a or b by fitting into the recesses at both ends of the long groove 32c.

38 is the above-mentioned automatic manual focus adjustment switching member 32
This is a transmission member for pressing the lock member 24 by the operation. The transmission member 38 is supported by the support portion 2c of the focus ring 2 so as to be movable relative to the focus ring 2 in the optical axis direction, and rotates integrally with the focus ring 2. 5, and is biased rearward (to the right in FIG. 5) by a spring 44. Furthermore,
A bent portion 38b that can be pressed by the cam 32a of the automatic manual focus adjustment switching member 32 is provided at the rear end of the transmission member 38, and the bent portion 38b is provided at the lower front end for automatic manual focus adjustment. A slope 38a is formed for pressing the locking member 24 to lower it when the transmission member 38 is pushed forward by the cam 32a of the switching member 32. still,
In this embodiment, when the focus ring 2 is set to the infinity focusing position, the transmission member 38 is configured to be in a position where it can be pressed by the automatic manual focus adjustment switching member 32. Further, the position of the cam 32a of the automatic manual focus adjustment switching member 32 is set to a position that does not restrict rotation of the rear end portion 38b of the transmission member 38, which rotates integrally with the focus ring 2, during manual focus adjustment. ing.

Furthermore, as shown in FIGS. 6 and 7, the outer periphery of the front part of the fixed barrel 4 is provided with a folding part of the transmission member 38 when the transmission member 38 is advanced by the automatic manual focus adjustment switching member 32. A pair of pins 4 for preventing rotation of the bent portion 38 are placed at the position where the bent portion 38b is located.
0.42 is planted. In addition, in this example,
Since the transmission member 38 is configured to be at the position shown in FIG. 7a or b when the focus ring 2 is set to the infinity focus position, If a means for preventing the transmission member 38 from rotating in that direction is provided, there is no need for a means for preventing the transmission member 38 from rotating in that direction (the pin 40 in this embodiment). Conversely, by preventing rotation of the transmission member 38, it is also possible to prevent the focus ring 2 from rotating beyond the infinity focusing position.

In this embodiment, the autofocus power switch 26 is arranged on the outer periphery of the fixed barrel 4, so the autofocus power switch 26 is connected to the first lens group holding barrel 22 as shown in FIGS. 1 to 4. switch 2
There is no need to provide 6.

To explain the operation in such a configuration, first, the manual focus adjustment state is shown in Figs. 5 and 7.
Shown in Figure a. In this state, the cam 32a of the automatic manual focus adjustment switching member 32 is connected to the transmission member 38.
Since the bent portion 38a of the transmission member 38 is not pressed, the transmission member 38 is moved backward by the spring 44. Therefore, the bent portion 38b of the transmission member 38 is connected to the pin 40,
Since rotation is not prevented by 42, the focus ring 2 is rotatable. In addition, the transmission member 38
Since the transmission member 38 is retracted, the slope 38a of the transmission member 38 does not press the locking member 24. Therefore, the lock member 24 is in the raised position, and the second lens group holding cylinder 20 and the second movable cylinder 8 are integrally connected by the lock member 24. When the focus ring 2 is rotated in this state,
Manual focus adjustment is accomplished by operations identical to those described in the embodiment of FIGS. 1-4.

Next, when switching from manual focus adjustment to automatic focus adjustment, the focus ring 2 is first adjusted to the infinity focusing position. Then, the transmission member 38 moves to the automatic manual focus adjustment switching member 32 as shown in FIG. 7a.
It comes to a position where it can be pressed. At the same time, the transmission member 38 is in a position where it can press the locking member 24 as shown in FIG. Therefore, as shown in FIG. 7a, when the automatic manual focus adjustment switching member 32 is moved in the direction of arrow A, the transmission member 3
The bent portion 38b of 8 is the automatic manual focus adjustment switching member 3.
At the same time, the autofocus power switch 26 is closed by the protrusion 32b of the autofocus adjustment switching member 32 and is moved forward in the direction of arrow c. Power is supplied to the automatic focus adjustment device, and the state shown in FIG. 7b is established. Furthermore, in FIG. 5, the transmission member 3
8 is advanced, the slope 3 of the transmission member 38
8a presses the lock member 24, and the lock member 24
is lowered. Therefore, the integral connection between the second lens group holding cylinder 20 and the second movable cylinder 8 is released, and the second movable cylinder 8 becomes rotatable. In this state, when the operating switch of the automatic focus adjustment device (not shown) is closed, the automatic focus adjustment is performed in exactly the same manner as described in the embodiments of FIGS. 1 to 4. will be done.

If the switching means of this embodiment as described above is used,
To press the automatic manual focus adjustment switch button 10 and keep the switch button 10 pressed when switching from manual focus adjustment to automatic focus adjustment, as in the embodiments shown in FIGS. 1 to 4. Since it is only necessary to move the automatic manual focus adjustment switching member 32 without rotating the switching button cover 12, the switching operation can be simplified.

FIG. 8 shows a modification of the embodiment of FIGS. 5 to 7. In Figure 8, Figures 5 to 7
The difference from the embodiment shown in the figures is that in the embodiment shown in Figs. The only thing that used to be a fit was changed to a helicoid bond. Therefore, in this embodiment, manual focus adjustment is performed in the same manner as in the embodiments shown in FIGS. 5 to 7, and when the second movable barrel 8 is rotated during automatic focus adjustment, the second movable The barrel 8 moves relative to the first movable barrel 6 in the optical axis direction, and the second lens group holding barrel 20 moves along the optical axis relative to the second movable barrel 8 due to the helicoid mechanism with the second movable barrel 8. relative movement in the direction.

With this configuration, both manual focus adjustment and automatic focus adjustment can be performed with high precision via the helicoid mechanism.

In all of the above three embodiments, when the focus ring is set to the infinity focus position,
Although the configuration is such that automatic focus adjustment and manual focus adjustment can be switched, the configuration is not limited to this, and the switch may be made when the focus ring has recently been set to the focus focus position, or the focus ring may be switched when the focus ring has recently been set to the focus focus position. As long as no member or the like interferes with manual focus adjustment, it may be configured to be switchable at any position.

Furthermore, the connection between the fixed cylinder and the first movable cylinder and the connection between the first movable cylinder and the second movable cylinder are not limited to the above-mentioned embodiments, but are also applicable to the embodiments shown in FIGS. 1 to 4. The second movable cylinder 8 and the second lens group holding cylinder 20 may be connected by sleeve fitting having a pin and a cam groove. Also, the first
If relative movement of the movable tube in the optical axis direction is not required, the first
Since the movable tube only needs to transmit the rotation of the focus ring to the second movable tube, the fixed tube and the first movable tube are sleeve-fitted to prevent the first movable tube from moving inadvertently in the optical axis direction. may be configured.

Furthermore, in order to restrict the relative rotation of the second movable barrel with respect to the fixed barrel during manual focus adjustment, the second movable barrel and the second lens group holding barrel are integrally coupled as in the above embodiment. Even if there is no such thing, a known straight key/straight groove means may be provided between the second movable barrel and the fixed barrel, or the autofocus drive lever 30 of the above embodiment may be fixed as a straight key. May be used.

As described above, according to the present invention, manual focus adjustment is performed by the same operation as the photographing lens of a normal single-lens reflex camera, and during automatic focus adjustment, the first movable barrel is moved against the fixed barrel. When the relative rotation is regulated and the second movable barrel is rotated relative to the first movable barrel, the second movable barrel is moved relative to the first movable barrel in the optical axis direction,
The lens group holding tube is configured to be moved relative to the second movable tube in the optical axis direction by the relative rotation of the second movable tube with respect to the first movable tube. The amount of relative movement in the optical axis direction of the lens group held by the lens group with respect to the fixed tube is the amount of relative movement in the optical axis direction of the second movable tube with respect to the fixed tube, and the relative movement amount of the lens group holding tube with respect to the second movable tube. The amount of relative movement in the direction is added, so the second
The relative rotation amount of the movable barrel with respect to the first movable barrel can at least move the lens group by a large amount in the optical axis direction with respect to the fixed barrel. Therefore, if the present invention is applied to telephoto lenses, macro lenses, etc., in which the lens group for focusing has a large amount of movement in the optical axis direction, automatic focus adjustment over the entire focusing distance range can be made better than conventional ones. This is easier than ever.

Furthermore, according to the present invention, no load is placed on the automatic focus adjustment system during manual focus adjustment, and no load is placed on the manual focus adjustment system during automatic focus adjustment, so both systems can move the lens group with a relatively light load. I can do it.

Furthermore, according to the embodiment, the second movable barrel and the lens group holding tube are connected by a sleeve fitting having a plurality of pins and cam grooves or a helicoid mechanism. This eliminates the possibility of the lens being pushed to one side, making it possible to move the lens group smoothly.

Further, when the second movable barrel and the lens group holding barrel are coupled by sleeve fitting having a pin and cam groove, the relative rotation amount of the second movable barrel with respect to the first movable barrel and the The second lens group holding cylinder
Since the shape of the cam groove can be set so that the amount of relative movement in the optical axis direction with respect to the movable tube has a non-linear relationship, the second movable tube can be rotated relative to the first movable tube at a constant speed. In this way, the focusing distance of the lens group can also be changed at a constant speed. in general,
In the long-distance focusing range, the focus distance changes rapidly with respect to the amount of rotation of the operating member for focus adjustment, which in the present invention is the second movable barrel, making it difficult to adjust with high precision; On the other hand, the changes are gradual, making it difficult to make quick adjustments, but with the configuration above, it is possible to make delicate adjustments in the long-distance focusing range, and improve operability in the close-distance focusing range. I can do it.

Furthermore, if the configuration is such that switching between automatic focus adjustment and manual focus adjustment is possible only when the lens group is set to its infinity focus position or close focus position, the automatic focus adjustment The second movable barrel can be rotated so as to move the lens group only in one direction, either the direction in which the lens group is extended or the direction in which it is retracted. The configuration can be simplified.

Furthermore, if the driving means for rotating the second movable barrel relative to the first movable barrel is provided in the lens barrel as in the embodiment, it will not protrude outside the lens barrel, so the appearance will be improved. It won't damage it or get in the way of manual focus adjustment.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a partial vertical sectional view showing the automatic focusing state, FIG. 3 is a partial longitudinal sectional view showing the manual focusing state, and FIG. 5 is a longitudinal sectional view of another embodiment, FIG. 6 is a perspective view of the main part of the switching means, and FIG. 7 is a schematic diagram of the main part showing the operation of the switching means. FIG. 8 is a longitudinal sectional view of yet another embodiment. 4... Fixed tube, 6... First movable tube, 8... Second
Movable tube, 20, 22... Lens group holding tube, 10,
24, 32, 36, 38... switching means, 18, 2
0c...first regulating means, 8c, 20d, 24...
Second regulating means, 4a, 10...Third regulating means.

Claims (1)

[Scope of Claims] 1. A fixed tube, which is engaged with the fixed tube so as to be rotatable relative to the fixed tube while the relative positional relationship in the optical axis direction with respect to the fixed tube is regulated according to manual operation. a second movable barrel that is engaged with the first movable barrel such that rotation relative to the first movable barrel causes relative movement in the optical axis direction with respect to the first movable barrel; a movable barrel, a lens group holding barrel that is engaged with the second movable barrel such that rotation relative to the second movable barrel causes relative movement in the optical axis direction with respect to the second movable barrel; a switching means for switching between focus adjustment and automatic focus adjustment;
a first regulating means for regulating relative rotation of the lens group holding barrel with respect to the fixed barrel without interfering with free movement of the lens group holding barrel in the optical axis direction; and a switching means for switching to manual focus adjustment. When
a second regulating means for regulating relative rotation of the second movable barrel with respect to the fixed barrel without interfering with free movement of the second movable barrel in the optical axis direction; and a switching means for switching to automatic focus adjustment. a third regulating means for regulating relative rotation of the first movable barrel with respect to the fixed barrel; and a driving means for rotating the second movable barrel relative to the first movable barrel when Features an automatic manual focus adjustable lens mirror copper. 2. The automatic manual focusing lens barrel according to claim 1, wherein the fixed barrel and the first movable barrel are coupled via a helicoid mechanism. 3. A patent characterized in that the fixed barrel and the first movable barrel are sleeve-fitted, and further includes means for regulating relative movement of the first movable barrel with respect to the fixed barrel in the optical axis direction. An automatic manual focusing lens barrel according to claim 1. 4. The automatic manual focusing lens barrel according to claim 1, wherein the first movable barrel and the second movable barrel are coupled via a helicoid mechanism. 5. Claims characterized in that the second movable barrel and the lens group holding barrel are sleeve-fitted, and one of them is provided with a cam groove, and the other is provided with a pin that fits into the cam groove. 2. The automatic manual focusing lens barrel according to item 1. 6. In an automatic manual focusing lens barrel in which the second movable barrel and the lens group holding barrel are sleeve-fitted to each other and connected by a cam groove and a pin that fits into the cam groove, the pin and cam groove 6. The automatic manual focusing lens barrel according to claim 5, wherein the connecting means are provided at two or more positions symmetrical with respect to the optical axis. 7. In the automatic manual focusing lens barrel in which the second movable barrel and the lens group holding barrel are sleeve-fitted to each other and are connected by a cam groove and a pin fitted thereto, The shape of the cam groove is such that the relative rotation amount of the second movable barrel with respect to the first movable barrel and the relative movement amount of the lens group holding barrel with respect to the second movable barrel in the optical axis direction are in a non-linear relationship. 6. A lens barrel capable of automatic manual focus adjustment according to claim 5. 8. The automatic manual focusing lens barrel according to claim 1, wherein the second movable barrel and the lens group holding barrel are coupled via a helicoid mechanism. 9. The lens group holding barrel is configured to be able to switch between automatic focus adjustment and manual focus adjustment only when it is set at its own infinity focus position or close range focus position. An automatic manual focusing lens barrel according to claim 1, characterized in that: 10. The automatic manual focusing lens barrel according to claim 1, wherein the driving means is provided within the lens barrel. 11. The automatic manual focusing according to claim 1, wherein the second regulating means performs regulation by integrally coupling the second movable barrel and the lens group holding barrel. Adjustable lens barrel.