JPH01248113A - Lens barrel - Google Patents

Abstract

PURPOSE:To realize a focus presetting function which is fast in response speed by allowing a mode changeover ring to serve as a go-home switch. CONSTITUTION:The mode changeover ring 40 is provided with three kinds of photographic modes, i.e. a manual move (M mode), a power focus adjustment mode (PF mode), an automatic focus adjustment mode (AF mode). In the PF mode or/and AF mode, the position of a focusing optical system L3 is stored with a focus preset switch 11 at an optional position in the focusing range and this position is held. When a go-home changeover switch 13 is inputted from a changeover switch 13 to a lens-side CPU by rotating a mode changeover ring 40 in a specific direction, the operation in both modes is stopped and the focusing optical system L3 is driven to a position of focus presetting. Consequently, the focus presetting and go-home operation are securely and easily performed.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention provides automatic focusing, which is performed by driving a focusing optical system using a driving force from a power source, and an automatic focusing system that operates according to the rotation of an IF mechanism and a manual focusing ring. The present invention relates to a lens barrel equipped with power focusing means that drives a focusing optical system using a driving force from a power source.

``Prior Art'' For example, a lens barrel with a built-in motor such as an ultrasonic motor has a mechanism that performs automatic focus adjustment and power focus adjustment using driving force from a power source, and a focusing optical system IJ! Set the setting to match any shooting position within the possible shadow range,
It is known that a so-called focus preset mechanism is added to return the optical system to the photographing position l when desired.

This lens barrel has a mode changeover switch for switching between automatic focus adjustment mode and power focus adjustment mode, a focus preset switch for memorizing the shooting position of the focusing optical system, and a focus reset switch. In order to move the focusing optical system to the desired photographing position, the camera is equipped with a focus preset operation ring that can be operated externally.

``Invention or problem to be solved'' However, such a conventional lens! ! In one cylinder,
As the functions of lenses have improved, many external operating members such as the above-mentioned mode selection switch, focus preset switch, and focus preset operating ring are installed on the lens barrel, making operations complicated and complicated. However, there was a problem in that the structure inside the lens barrel became complicated.

The present invention was made with attention to such conventional problems, and the present invention provides a lens that has a simple configuration and allows automatic focus adjustment, power focus adjustment, focus preset, and go-home to be performed reliably and easily. Our first objective is to provide a lens barrel.

"Means for Solving the Problems" The gist of the present invention to achieve the object described in L is to drive the 1st focusing optical system (3rd) by the driving force from the power source to autofocus 2g 1 point. an automatic focus adjustment stage for performing electronic force focus adjustment by driving the focusing optical system with a driving force from the power source in response to rotation of the manual focus ring; a detection means (36) for monitoring the position of the camera; and a storage means (101) for storing an output (1) of the detection means (36) corresponding to an arbitrary photographing position within the photographable range of the focusing optical system. and a go-home drive means for returning the focusing optical system to the photographing position α according to the memory in the storage means (101); According to “1
The photographing mode is switched between an automatic focus adjustment mode position where the dynamic point adjustment means is started and a power focus adjustment mode position where the power focus adjustment means is started, and the shooting mode is switched to an activation position where the go-home driving means is started. A lens barrel comprising a rotating mode switching ring (40), and the mode switching ring further switches the focusing optical system to a manual shooting mode position in which the focusing optical system is manually rotated, and the manual 0 for restraining the mode switching ring (40) so that it does not change to another mode inadvertently during the shooting mode.
771 stages, and a return means that returns the mode switching ring (40) to that position unless an external force is applied to turn the mode switching ring (40) in a predetermined direction during automatic focus adjustment or power focus adjustment. Exists.

``Operation'' The lens barrel operates in an automatic focusing mode in which the focusing optical system is driven by the driving force from the power source, and in a manual focusing ring. When manually rotated, the focusing optical system is driven by the driving force from the power source in accordance with the rotation, and a power focusing mode can be set in which the focal position is selected by visual confirmation.

The photographing mode is switched by manually rotating the mode switching ring around the optical axis to each mode position. In the automatic focus adjustment mode position, the lens barrel is adjusted to the automatic focus adjustment 11i? by the automatic focus section A means. The camera is in a state where shadows are to be produced, and when the power focus adjustment mode is changed, it is in a state where power focus WJ photography is performed using the power focus adjustment yJr- stage.

Further, the mode switching ring performs a go-home operation.

The position of the focusing optical system is constantly monitored by the detection means, and any lJ! When a shooting name or an instruction to store a shadow position is incremented, the storage means stores it as an output value corresponding to that position of the detection means.

When the mode switching ring is rotated to the starting position of the go-home drive means, the go-home drive means returns the focusing optical system to the position of the output value of the detection means stored by the storage means.

In the second invention, the mode switching ring is further switched to the manual shooting mode position for driving the focusing optical system by manually operating the manual focus ring, and the mode switching ring is switched to the manual shooting mode position for driving the focusing optical system by manually operating the manual focusing ring, and the mode switching ring is switched to the manual shooting mode position for driving the focusing optical system by the return means. energized to stop at the autofocus mode position and the power focus mode position during focus adjustment;
That is, when the switching ring is turned in a predetermined direction from this position, it is rotated to the starting position of the go-home drive means, and if no external force is applied to cause this rotation, the switching ring is returned to its original position by the return means.

Furthermore, the mode switching ring is restrained to prevent the camera from inadvertently switching to another mode when the camera is in the shooting mode of the manual shooting mode position.

Since the two-focus lens is constantly monitored by the detection means as described in Section 2, the influence of play in the transmission system in the middle is reduced compared to the case where an indirect detection means such as the rotation speed of the drive system is provided. It is possible to measure the control accuracy of the position.

By driving the focusing lens in accordance with the movement of the manual focusing ring, if the resolution is sufficient, fine adjustments to the same degree as manual operation can be made.

The output value of the detection means corresponding to any shooting position within the shooting range of the focusing optical system is stored, the focus preset operation is performed, and the go-home function is operated using the mode switching ring to focus the lens at the preset position. The motor can be controlled to drive the camera, allowing for highly accurate focus presets and quick operation.

"Example" Figures 1 and 2 show an example of the present invention.
FIG. 1 is a vertical cross-sectional view of an embodiment of the lens barrel, FIG. 2 is a cross-sectional view of the vicinity of the mode switching ring, and FIG. 3 is a conceptual diagram of the lens barrel attached to the camera body.

In FIG. 1, the lens barrel 10 has a fixed barrel 20 as its base, and a lens holding barrel 30 that fits into the inner periphery of the fixed barrel 20. Various members such as the mode switching ring 40 and the manual focus ring 50 that fit on the outer periphery are directly or indirectly connected to the fixed cylinder 2.
It is supported by 0.

The fixed barrel 20 has a mounting tab 21 on the mount side for attaching to the camera body l (see Fig. 3), and is composed of an outer barrel part 22 and an inner barrel part 23. A photographing optical system Ll is held on the inner periphery of the side, and a photographing optical system L2 is held on the inner periphery of the rear end.

An ultrasonic motor 25 is disposed at the base of the space between the inner cylinder part 23 and the outer cylinder part 22 of the double cylinder 20. The ultrasonic motor includes a stator 25a made of a piezoelectric element and an elastic body, and a rotor 2.
5b are combined, the stator 25a is fixed to the fixed cylinder 20, and the rotor 25b is rotatably fitted to the outer periphery of the inner cylinder part 23.

A pressure member 26 is disposed between the inner cylindrical portion 23 of the fixing member 1320 and the rotor 25b of the ultrasonic motor 25, and the rotor 25b and stator 25a are brought into pressure contact with each other by the pressure member 26. A terminal (not shown) for supplying power or transmitting signals is provided in the circumferential direction on the flat part 25c on the rear side of the stator 25a, and a motor drive circuit (corresponding to 102 in FIG. 3) for driving the ultrasonic motor is provided. ).

A lens holding cylinder 30 that holds the focusing optical system L3 is slidably fitted into the middle part of the inner part 23 of the fixed cylinder 20. A rotary cylinder 32 is rotatably fitted to the outer periphery of the inner cylinder part 23.

A pin 31 is provided on the lens holding cylinder 30, and a pin 31 is provided on the lens holding cylinder 30.
is inserted into the linear guide groove 24 formed in the inner cylinder part 23 of the fixed cylinder 20 in the optical axis direction, and then fitted into the LEET groove 33 provided in the rotary cylinder 32.

A plurality of grooves 34, 34... are provided on the outer periphery of the rotary tube 32, a plurality of grooves 35, 35... are provided on the proximal end side, and the tip is provided with a groove 35, 35... to limit the rotation of the rotary tube 32. Notch 35
A is provided, and a fixed cylinder side limiting portion 23a is provided.

A pattern portion 36a is provided on the tip side of the rotary cylinder 32,
Corresponding to this, a detection part 36b is provided in the fixed cylinder 20,
The pattern section 36a and the detection section 36b constitute an encoder that detects the rotational position of the rotating barrel 32, and the rotation of the rotating barrel 32 corresponds to the position of the focusing optical system L3. detection means 36 for monitoring the position of
is doing.

At the front of the outer periphery of the fixed barrel 20, there is a focus brisseur that stores an arbitrary focus position within the photographable range of the focusing optical system L3 in the power focus adjustment mode or automatic focus adjustment mode.
Focus switch 11 is provided, and focus switch 11 is provided.
A brush lla is provided integrally with the switch 11.

The flange lla is in contact with the trust generation pattern 12 provided on the circular layer of the fixed cylinder 20. The signal generated by pattern 12 and flange lla is the CP inside the lens barrel.
U (corresponding to 101 in FIG. 3) and stored.

A clutch member 37 is provided between the rotary cylinder 32 and the rotor 25b of the TFL sonic motor 25, and is rotatably fitted to the outer periphery of the inner cylinder part 23 of the fixed cylinder 20 to connect and separate the two. ing. The clutch member 37 has keys 37a, 37
The key grooves 35 of the rotary cylinder 32 are protruded from the front and rear of the b.
and key 1+W 25 d of stator 25b and fitting i7
It has become Noh.

An intermediate member 38 for mode switching and another intermediate member 39 fitted to the inner periphery of the intermediate member 38 are provided inside the external portion 22 of the fixed portion 20.

The pin 38a provided on the intermediate member 38 is fitted into the groove 45 of the mode switching ring 40, and the pin 38a is fitted into the groove 45 of the mode switching ring 40.
and the intermediate member 38 rotate together. The intermediate member 38 is rotatably fitted to the fixed cylinder 20 at a rear end portion 38b.

A flange 13a is provided at the rear of the intermediate member 38 for mode switching and for issuing a go-home signal. Brush 13
A is in contact with a pattern portion 13b provided on the fixed barrel 20, and together they constitute a switching switch 13, and a mode signal is sent from the switching switch 13 to the CPU (corresponding to 101 of 3rd +g) inside the lens barrel. and a go-home signal are transmitted.

Further, the intermediate member 38 is provided with a cam II 438c, and a pin 39a provided on the intermediate member 39, which is fitted on the inner periphery of the intermediate member 38, is fitted into this cam groove 38c. The key 39b at the rear of the intermediate member 39 is fixed 020
is fitted into the keyway 27 of. A coil spring 37c is stretched between the rotating member 32 and the clutch member 37 so that the intermediate member 39 and the clutch member 37 are always in contact with each other.

The pin 38d provided on the front side of the intermediate member 38 is connected to the intermediate song 5 which is fitted to the inner circumference of the manual focus ring 50.
It fits into the cam groove 51a of No. 1.

As shown in FIGS. 1 and 2, the mode switching ring 4
0 is provided so as to fit into the outer cylinder portion 22 of the fixed cylinder 20.

The mode switching ring 40 has a manual mode (hereinafter referred to as M
It's called a mode. ), power focusing mode (hereinafter referred to as PF
There are three types of shooting modes: automatic focusing mode (hereinafter referred to as AF mode), and autofocus mode (hereinafter referred to as AF mode).

That is, the switching button 41a or the fixed lock spring 4
1 or is held in a fixed cylinder 20, and this lock spring 41
Or the M mode groove 42 provided in the mode switching ring 40.
．． It engages with the PF mode groove 43 and the AF mode groove 44, and the mode switching ring 40 is restrained by the action of coil springs 47a and 47b, as will be described later. Mode switching ring 40
is configured to be able to move between the grooves when the lock spring 41 is removed from each groove by pressing the switching button 41a.

The M mode groove 42 is the width of the lock spring 41, and when engaged, is locked to prevent the mode switching ring 40 from inadvertently moving in any direction. In addition, the PF mode groove 43 is connected to the lock spring 41.
It is formed widely and is movable within that range against the mode switching ring 40 or the coil springs 47a, 47b. Normally, the lock spring 41 or the PF mode groove 43 is moved by the action of the coil springs 47a, 47b. is held in a state in contact with the groove end surface 43a on the M mode groove 42 side, and in that state or PF
mode. Further, the AF mode groove 44 is constructed in the same manner as the PF mode groove 43, and the mode switching ring 40 is moved within the range of the groove 44. Usually, a coil spring 47a is used.

Lock spring 41 or AF mode IM due to the action of 47b
44 is held in a state in which it is in contact with the groove end surface 44a on the M mode groove 42 side, and this state is the AF mode.

Mode switching is performed by pressing the switching button 41a, removing the lock spring 41 from the groove, and rotating the mode switching ring 40 in the circumferential direction. The lens can be rotated by a fixed angle of 11 degrees in a specific direction (to the right of A2 in PF mode, to the left in AF mode).

A circumferential groove 46 is formed on the inner periphery of the mode switching ring 40, into which a protrusion 28 protruding from the fixed cylinder 20 is fitted. Outer ends 46a, 46b of protrusion 28 and circumferential groove 46
Coil springs 47a and 47b are stretched between the two.

The coil springs 47a and 47b are limited to the lock spring 41 or the M mode groove 42 when the force is balanced, and in the PF mode, the elastic force pushes the lock spring 41 toward the M mode groove 42 to switch to the PF mode. Press it against the groove end surface 43a of the groove 43,
On the contrary, it is set to be pressed against the groove end surface 44a of the AF mode groove 44 in the F mode, and to maintain that state unless an external force is applied to the mode switching ring 40 in the PF mode or the AF mode.

Even if an external force is applied, the mode switching ring 40 returns to the lower position due to the elastic force of the coil springs 47a and 47b, and a mechanism related thereto serves as a return means.

Since the groove 45 is engaged with the pin 38a provided on the intermediate member 38, the mode switching ring 40 and the intermediate member 38 are fixed to rotate together, and the pin 38 is attached to the fixed cylinder 20.
A clearance groove 29 is provided for use when rotating.

Next, the structure of the parts related to the go-home driving means will be explained. In PF mode (or AF mode), rotate the mode switching ring 40 further to set the lock spring 41.
When rotated toward the groove end surface 43b side (toward the groove end surface 44b side during AF), a signal is generated by the flange 11 provided on the intermediate member 38 and the pattern portion 12, and a go-home function is activated.

Go-home machine 1 has focus preset switch 1
1, memorize an arbitrary shooting position and select the memorized focus position (
This is a mechanism that resets the focusing optical system L3 to the focus preset position (focus preset position), and when this command is issued, the PF operation or AF operation is stopped the day before. When the mode switching ring 40 is removed from the go-home position, the coil springs 47a and 47b automatically return the mode switching ring 40 to the original mode position and start operation in the original mode.

A manual focus ring 50 is rotatably fitted to the outer periphery of the fixed cylinder 20. The manual focus ring 50 is provided with an encoder pattern 52a as a means for detecting this rotation, and the pattern 52a and the fixed barrel 20
The PF pulse encoder 52 is configured by the detection unit 52b fixed to the PF pulse encoder 52.
detects signals such as the rotation direction and rotation angle of the manual focus ring 50, and the CPU (iln3) inside the lens detects the rotation direction and rotation angle of the manual focus ring 50.
(equivalent to lot in the figure).

Further, as described above, the fixed barrel 20 is also provided with the detection section 36b of the encoder river pattern 36a, and similarly, the detection part 36b of the encoder river pattern 36a is connected to the optical system L3 through the rotation direction and rotation angle of the rotating barrel 32. A signal indicating the position of the lens is transmitted to the CPU inside the lens.

The manual focus ring 50 and the rotation 032 are fixed to the manual focus ring 50 by a clutch spring 54 or a piece member 55 for latch operation, and a screw 55a. A key 54a is integrally provided at the tip of the clutch spring 54, and the key width is such that it fits into the groove 34 of the rotary cylinder 32.

The manual focus ring 50 is provided with a straight groove 55c, and a pin 56a provided on an intermediate member 56 rotatably fitted inside the manual focus ring 50 is engaged with the straight groove 55c. The intermediate member 56 has a circumferential groove 56b.
A pin 51b provided in the intermediate ring 51 is fitted therein. Furthermore, a key 56c is provided and is located in a groove 29a carved in the fixed cylinder 20.

Further, a notch 56d into which the clutch spring 54 is inserted is formed in a part of the intermediate member 56, and a protrusion 56e provided at the end of the notch 56d is in contact with the clutch spring 54.
6 in the optical axis direction, the clutch spring 54 moves up and down.

FIG. 3 is a conceptual diagram of the lens barrel lO aligned with the camera body 110 by M1.

In addition to the above-mentioned mechanical structure, the lens barrel lO has a lens side c
pu i o t, drying and drying drive circuit 102, PF pulse processing river PU 103, provided between the notch 35a of the co-rotating cylinder 32 and the fixed cylinder side restriction part 23a of the inner cylinder part 23 of the fixed cylinder 20. A limit circuit 104 is provided. CPU10
I also serves as a memory means.

PF pulse processing CPU103. Motor drive circuit 102
A system that controls the ultra-72-wave motor 25 to move the focusing optical system L3 in response to the rotation of the manual focus ring 50 constitutes a power focusing drive stage.

The camera body 110 includes a focusing control circuit 112 and a distance measuring photoelectric converter 113 as an electrical system configuration, and an optical system configuration including a semi-transparent mirror 115 that receives incident light from the lens barrel 1o and a Sub mirror 114, semi-transparent mirror 11
A focusing plate 116 and a condenser lens 117 receive the reflected light from the lens 5, and a pentaprism 118 reflects the light passing through the condenser lens 117 to form a normal image of the subject. The finder 461 is equipped with a lens 119.

In conjunction with the focus control circuit 112 of the camera body 110, the lens-side CPU I0I and the motor drive circuit 102 control the ultrasonic motor 25 to move the focusing optical system L3, or an automatic focus adjustment drive means. .

Next, the effect will be explained.

In the AF mode, the light flux from the subject passes through the photographing optical system L1, and a part of the light flux is reflected by the semi-transparent mirror 115 of the camera body 120 to form a subject image on the focus plate 116.

This subject image is guided to the photographer's eye via a condenser lens 117, a pentaprism 118, and a finder eyepiece 119. Further, a part of the light that has passed through the semi-transparent mirror 115 is reflected by the submirror 114 and guided to the photoelectric conversion unit 113 for distance measurement.

The output signal from the distance measuring photoelectric conversion section 113 is input to the focusing control circuit 112, and the focusing control circuit 112 determines the driving direction and driving position of the focusing optical system L3. These drive signals are transmitted to the lens-side CPU i o i inside the lens, from which they pass through the motor drive circuit 102 and drive the ultrasonic motor 25 until the drive amount is reached.

When the drive is finished, the in-focus state is detected again, and if it is not in focus, the above operation is repeated until one focus is achieved.
Note that a limit circuit 104 is provided between the lens rotation limiter 26 and the rotation t132, and the focusing optical system L3
When reaching infinity or a close position, the lens side CP
Notify U 101 of this first warning and reverse the focusing optical system L3.

In the PF mode, the PF pulse encoder 52 for detecting the rotation direction, rotation amount, and speed of the manual focus ring 5° or the movement of the manual focus ring 50 is detected, and this signal is transmitted to the PF pulse processing CPU 103. From here, a signal is sent to the lens side CPU I O1, and from the lens side CPU I O1, a signal is sent to the motor drive circuit 10.
2 drives an ultrasonic motor 25.

At this time, while monitoring the movement of the focusing optical system L3 using the detection means 36, the focusing optical system L3 is connected to the lens side CPU I O1.
The amount of movement monitored by the first detection stage 36 or the movement of the manual focus ring 50 v5 is fed back to the movement of the manual focus ring 50.
Correspondingly, the ultrasonic motor 25 is configured to stop driving when the lens-side CPU reaches the specified position.

Next, the go home function in PF mode or AF mode will be explained. In both modes, when a signal for memorizing the focus position is input to the lens side CPU IOL by the focus reset switch 11 at any position within the focus range, the detection means is activated when the signal is input. 36 stores the position of the focusing optical system L3 that is input to the lens @CPLJIOI.

This position is held until the focus preset switch 11 is released or the power is turned off. If you do not operate the focus preset switch 11,
The lens position when the power is turned on is memorized, and when the focus preset switch 11 is activated by +1, the position at the time of activation is changed to the previous position.

Then, when the mode switching ring 40 is turned in the specific direction in the PF mode or AF mode and a go-home signal is input from the switching switch 13 to the lens side CPU I O1, the operation of the PF mode and AF mode is stopped. A signal for driving the focusing optical system L3 at the focus preset position is input from the drive circuit 102 to the ultrasonic motor 25.

When the focusing optical system L3 is driven by the ultrasonic motor 25 and the position detected by the monitor detection F stage 36 matches the preset position, tfli□' is sent as a signal to stop the wave motor 25 from the lens side CPU I O1. Then, the sonic motor 25 is activated.

Next, the mode switching operation will be explained.

, the focusing optical system L is activated by the driving force of the TFL wave motor 25.
The PF mode or AF mode for driving the camera 3 is set by moving the mode switching ring 40 to the PF mode or AF mode position while pressing the switching button 41a.

The 21st-A shows the state set to either of these two totes. When the mode switching ring 40 is changed from the M mode to the PF mode (or AF mode), the pin 38a fitted into the groove 45 causes the intermediate member 38 to rotate together with the mode switching ring 40.

The pin 39c fits into the cam groove 51a of the intermediate ring 51 and the key 5 of the intermediate member 56 fits into the key groove 29a.
6c causes the intermediate ring 51 to move in the right direction in FIG. 2 with respect to the optical axis, so the intermediate member 56 also moves in the same direction due to the pin 51b fitted into the circumferential groove 56b of the intermediate member 56.

The lower surface of the clutch spring 54 is attached to the protrusion 56e of the intermediate member 56.
By pushing up, the key 54a integrated with the intermediate member 56 separates from the groove 34 of the rotation 032, and the connection between the manual focus ring 50 and the rotation barrel 32 is severed.

In parallel with this, there is a pin 39a that fits into the cam groove 38c of the intermediate member 38, a key 39b, and a key groove 27 of the fixed cylinder 20.
1. The intermediate member 39 moves to the left of the second UA with respect to the optical axis. When the end face of the clutch member 37 having the key 37b fitted in the key groove 25d of the rotor 25b of the TFL sonic motor 25 is pushed while resisting the spring 37c, the groove 35 of the rotary cylinder 32 and the key part 37a engage with each other. The rotation of the super wave motor 25 is transmitted to the rotating cylinder 32.

When the rotary cylinder 32 rotates, the leet groove 33. A pin 31 provided in the straight groove 24 and the lens moving frame 30 that fits into these grooves.
The focusing optical system L3 is driven in the optical axis direction.

When the mode switching ring 40 is switched from the PF mode or the AF mode to the manual mode, the clutch operation is reversed. 32 connections are cut.

In manual mode, it is combined with ultrasonic motor 25! , the connection with the rotary tube 32 for driving the seven optical system L3 is broken,
If the manual focus f5504 is rotated, the rotary cylinder 32 will be rotated directly, so the focusing optical system L3 will be driven.

When the lens barrel according to this embodiment is in the manual operation mode, the manual focus ring and the lens drive relay member are connected together by the clutch means interlocked with the mode switching ring, and at the same time the super 1'f wave motor and the lens drive relay member are separated. In addition to this, it is also removable for use with cameras that cannot be driven by an ultrasonic motor, as well as in unexpected situations such as when the battery runs out.

In addition, regarding the PF mode, the configuration provided in the lens barrel alone is enough to operate, and there is no need to take any measures on the camera body side, which increases the number of types of camera bodies that are compatible with the lens barrel.

"Effects of the Invention" According to the lens barrel according to the present invention, the mode switching ring also serves as a go-home switch, and it is easy to switch, return, or rotate, so it is easy to operate and has a high response speed. A focus preset unit can be realized.

Furthermore, those provided with locking means and return means,
To ensure operability and to perform a reliable switching operation without inadvertently switching modes or inadvertently performing a go-home operation.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention. Figure 1 is a vertical cross-sectional view of the lens barrel, 2UA is a cross-sectional view of the vicinity of the mode switching ring, and Figure 3 is a combination of the lens barrel and a camera. FIG. lO...Lens barrel Ll, L2...Photographing optical system L3...Focusing optical system 11...Focus preset switch 13...Switching switch 20...Fixed barrel 22...Outer barrel Department
23...Inner cylinder part 25...Ultrasonic motor
30... Lens holding tube 32... Rotating tube
36...Detection means 37...Clutch member
38.39...Intermediate member 40...Mode switching ring 41...Lock spring 41a...Switching button
42...M mode groove 43...PF mode groove 4
4...-AF mode groove 46...Circumferential groove 4
7a...Coil spring 50...Manual focus ring 51...Intermediate ring 52...PF pulse encoder 54...Clutch spring 56...Intermediate member lo
t... Lens side CPU 102... Motor drive circuit 103... CPU for PF pulse processing 104... Limit circuit 110... Camera body 112... Focus control circuit 113... For distance measurement Photoelectric conversion unit 114...Submirror 115...Pattern mirror 116...Focal plate 117...Condenser lens 118...Penta prism 119...Fineter eyepiece, -4-, 2F Fig. 5

Claims (1)

[Scope of Claims] 1. automatic focus adjustment means that performs automatic focus adjustment by driving a focusing optical system using a driving force from a power source; and an automatic focusing means that performs automatic focusing by driving a focusing optical system using a driving force from a power source; a power focusing means for driving the focusing optical system to perform electric focusing; a detecting means for monitoring the position of the focusing optical system; and a power focusing means for controlling the position of the focusing optical system; storage means for storing the corresponding output value of the detection means; go-home drive means for returning the focusing optical system to the arbitrary photographing position according to the memory in the storage means; an autofocus mode position movably arranged to activate the autofocus means by rotation;
A lens barrel comprising: a mode switching ring that switches a photographing mode between a power focus adjustment mode position that activates a power focus adjustment means, and rotates to a start position that activates the go-home drive means; . 2. In the lens barrel according to claim 1,
The mode switching ring is further switched to a manual shooting mode position in which the focusing optical system can be driven manually, and a locking means is provided to restrain the mode switching ring from inadvertently switching to another mode during the manual shooting mode. and a return means for returning the mode switching ring to its position if there is no external force to turn the mode switching ring in a predetermined direction during automatic focus adjustment or power focus adjustment.