JP2000249897A - Manual and motor-driven device for lens barrel capable of correcting pumping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly execute the matching of a condition or the like for an object by unnecessitating the changeover operation of manual and automatic operation and also to correct a pumping phenomenon caused at a focus operation time. SOLUTION: The gear movable plate of a clutch mechanism is connected to the external tooth of a zoom operation ring, and the gear fixing plate of the clutch mechanism is connected to a zoom motor 35, and the gear movable plate is operated by a clutch actuating motor 37 through a coil spring and a movable gear, so that connection and disconnection to the gear fixing plate are executed. Then, when focusing operation is executed at a manual zoom- setting time, a viewing angle correction data are read based on present focusing position and zooming position by connecting the clutch mechanism by the clutch actuating motor 37, and a zoom lens is driven to a correction position by the motor 35, so that the change of a viewing angle due to focusing is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manual and motorized device for a lens barrel, and more particularly to a device for performing both manual and motorized operations in a zoom and focus driving operation of a lens unit without switching operation. Regarding possible configurations.

[0002]

2. Description of the Related Art Conventionally, a lens barrel used for a camera, a television camera, or the like is provided with a focus lens for focusing and a zoom lens for zooming. Electric (automatic) switching is possible (for example, Japanese Patent No. 2773230).

FIG. 6 shows an example of a configuration relating to a zoom drive in a conventional lens barrel. 6B, the left side is the front side, and a zoom operation ring 3 that is rotatable with respect to the main body ring 2 is disposed. The zoom operation ring 3 controls the zoom lens by an internal mechanism. It is configured to be able to move in the axial direction. External teeth 4 are formed on the outer periphery of the zoom operation ring 3, and a switching gear 6 and a shaft 6 are attached to the main body ring 2 via a bearing member 5.
A is attached, and the shaft 6A is separate from the switching gear 6, and the gear 6 is axially movable and rotatably supported.

The switching gear 6 has a first gear 6B meshing with a shaft gear 8 of a zoom motor 7 as shown in the figure, and a second gear 6B which moves forward to mesh with the external teeth 4 of the zoom operation ring 3. It has two gears 6C. Further, there is provided a switching operation knob 10 for switching between manual operation and electric operation by a rotation operation, and the driving pin 11 mounted on the lower disk of the operation knob 10 and rotating is provided with the first gear 6B and the second gear 6B. 6C.

According to the above configuration, the switching operation knob 1
When 0 is operated to the position shown in FIG. 6 (A), the state is set to manual (manual), and the switching gear 6 moves to the rear side and is disengaged from the external teeth 4 of the zoom operation ring 3. Becomes Therefore, in this state, the zoom operation ring 3 can be rotated by hand, and the zoom operation drives the zoom lens to a desired magnification.

On the other hand, when the switching operation knob 10 is rotated clockwise from the state shown in FIG. The switching operation knob 10 moves the switching gear 6 to the front side by rotating the drive pin 11 to a position indicated by a chain line in the figure, and meshes the second gear 6C with the external teeth 4. At this time, the other first gear 6B
Does not come off the gear 8 of the zoom motor 7. Therefore, in the case of electric power, when the zoom switch (not shown) is pressed, the zoom motor 7 is rotated, and the zoom operation ring 3 is rotated via the switching gear 6, and as a result, the zoom lens is set to a predetermined position. It is possible to drive in the direction.

[0007]

However, in the lens barrel which can be switched between manual and automatic, the switching operation for rotating the switching knob 10 is necessary as described above, and this operation is complicated. Becomes In addition, since such a switching operation is performed, for example, there is an inconvenience that a subject is not quickly focused and a shooting opportunity is missed.

Further, the conventional apparatus having a zoom function has a problem that a so-called pumping phenomenon occurs in which the angle of view of an image changes when the focus lens is moved. In other words, this becomes noticeable at the wide end, but when the focus operation is performed, the angle of view set up to that point becomes small, for example, and as a result, the image is slightly enlarged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to eliminate the need for manual and automatic switching operations, to quickly adjust the conditions for a subject, and to occur during a focus operation. An object of the present invention is to provide a manual and electric device for a lens barrel that can correct a pumping phenomenon.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides an electric motor for automatically moving a zoom lens disposed on a lens barrel, and an electric motor for rotating an outer peripheral portion of the lens barrel. A zoom operation ring (manual operation ring) that is freely disposed and manually moves and operates the zoom lens; a clutch mechanism for connecting and disconnecting the connection between the zoom operation ring and the electric motor; A clutch actuating motor for connecting and disconnecting operation,
When a focus operation is performed during zoom manual setting (at the time of manual standby), the clutch mechanism is connected using the clutch operation motor, and an angle-of-view correction unit that corrects a change in the angle of view due to focusing. It is characterized by becoming.

According to the above arrangement, for example, when the zoom switch is pressed, the clutch mechanism is connected by the clutch operating motor, so that the rotation by the electric motor is given to the zoom operation ring via the gear train, thereby the zoom lens. Will be driven. Thereafter, when the zoom switch is released, the connection of the clutch mechanism is disconnected, and a standby state for manual operation is established. When the focus operation (manual or electric) is performed, the clutch mechanism is connected, a correction signal is calculated based on a signal of the set focus position and a signal of the current zoom position, and output to the electric motor. Is done. As a result, for example, the zoom lens is driven to the wide side, and the change in the angle of view caused by focusing is corrected.

[0012]

1 to 4 show the structure of a manual and an electric device of a lens barrel capable of correcting pumping according to an embodiment. First, referring to FIGS. 3 and 4, FIG. Will be described. The lens barrel 14 shown in FIG.
Then, the hood 15 is attached to the front end, and the connection can be made to the camera body at the connecting portion 16 at the rear end. A focus operation ring 17 and a zoom operation ring (manual operation ring) 18 are attached to the outer periphery of the lens barrel 14 so as to be rotatable manually or electrically.
External teeth 19 for electric drive are formed on the outer periphery of 8.

Further, a zoom switch 20 for a zoom operation is attached to a grip portion or the like arranged on the outer periphery of the lens barrel 14. The zoom switch 20 is a seesaw switch that moves the both ends set in the tele (enlargement) direction and the wide (reduction) direction up and down to perform a seesaw operation. For example, the zoom switch 20 changes its speed in accordance with the pressed depth. Is set. As shown in FIG. 4, a clutch mechanism and a rotation mechanism at the time of disconnection are attached to the main body ring 22 of the lens barrel 14 via a support member 23.

In FIG. 4, a main shaft 25 is fixed on the support member 23, and a disk-shaped movable plate (gear movable plate) 26 and a fixed plate (gear) are fixed so that the outer periphery of the main shaft 25 is rotatable. A fixing plate 27 is attached. This movable plate 2
External teeth 26G and 27G are formed on the outer circumference of the fixing plate 6 and the fixing plate 27, and have both functions of a clutch plate and a function as a gear. The external teeth 19 of the zoom operation ring 18 mesh with the external teeth 26G of the movable plate 26.
The movable plate 26 and the fixed plate 27 functioning as a clutch plate
As shown in the figure, a circular groove (friction surface) H having a tapered side surface is formed in the movable plate 26, and is fitted in the circular groove H, and a fitting protrusion (frictional surface) also having a tapered surface is formed. Surface) I
Are formed on the fixing plate 27. The movable plate 26 is provided with a first thrust bearing 30 via a coil spring 28, and the movable plate 26 is urged toward the fixed plate 27 by the coil spring 28. Therefore, the clutch connection is achieved by the frictional contact between the circular groove H and the fitting protrusion I and the urging and pressing of the coil spring 28.

The first thrust bearing 30
The disk 30A on the coil spring contact side (rear side) of the
Is rotatable around the outside, but the other front disk 30B
Is fixed to the moving gear 31, and the disc 30B and the gear 3
1 is screwed to a screw portion 25A formed on the front side of the main shaft 25. Therefore, the disk 30A, the coil spring 28, and the movable plate 26 rotate separately from the moving gear 31 side, and the movable plate 26 is fixed to the fixed plate 2 during manual operation.
It functions as a rotation mechanism at the time of cutting which is separated from and rotated.

On the other hand, a second thrust bearing 33 is also arranged on the fixed plate 27 side. In this bearing 33, a rear disk 33A is fixed to the main shaft 25, and the front disk 3
3B rotates together with the fixed plate 27. A zoom motor (electric motor) 35 is attached to the external teeth 27G of the fixed plate 27.
Shaft gears 36 mesh with each other. Therefore, in a state where the movable plate 26 is connected to the fixed plate 27, the rotational driving force of the zoom motor 35 is controlled by the zoom gear via the shaft gear 36, the fixed plate external teeth 27G, the movable plate external teeth 26G, and the external teeth 19. The ring 18 is provided.

Further, a clutch operating motor 37 for operating the clutch mechanism is provided, and a shaft gear 38 of the motor 37 is meshed and connected to the moving gear 31 on the first thrust bearing 30 side. Therefore, by rotating the clutch operating motor 37 in a predetermined direction, the moving gear 31 can be rotated and advanced to the rear side, and the movable plate 26 can be pressed against the fixed plate 27 while the motor 37 is rotated in reverse. By rotating the movable plate 26 in the direction, the movable plate 26 can be separated from the fixed plate 27. The shaft gear 3 of the clutch operation motor 37
8, a potentiometer 41 is connected via a gear 40, and this potentiometer 41 detects the rotational state of the movable gear 31 on the first thrust bearing 30 side, that is, the pressed state of the movable plate 26.

A zoom potentiometer 43 for detecting a zoom position is mounted on the outer ring 19 of the zoom operation ring 18 via a gear 42. on the other hand,
External teeth 44 are also formed on the focus ring 17 described above, and a focus potentiometer 46 is connected to the external teeth 44 via a gear 45, thereby detecting the rotational position of the focus operation ring 17, that is, the focus position. .

FIG. 1 shows an electrical configuration of the apparatus. As shown in FIG.
Is provided via an A / D converter 48, and a CPU 49 is provided for overall control. This CPU 49 stores angle-of-view correction data for correcting an angle of view that changes during focusing. The memory 50 is connected.

The CPU 49 is connected to a zoom motor drive circuit 53 for controlling the drive of the zoom motor 35 via a D / A converter 52, and to a clutch operation motor drive circuit 54 for controlling the drive of the clutch operation motor 37. Is done. An arithmetic circuit 56 is connected to the CPU 49 via a D / A converter 55.
6 calculates (for example, adds) a zoom position signal detected by the zoom potentiometer 43 and a zoom control position signal or a zoom correction position signal output from the CPU 49.
Then, the process returns to the CPU 49 as a zoom control signal. That is, the CPU 49 controls the servo position by driving the zoom motor 35 with a signal obtained by adding the zoom position control signal formed by the operation of the zoom switch 20 and the current zoom position signal.

On the other hand, when the focus operation is controlled during the standby of the manual operation of the zoom, the clutch operating motor 37 is operated via the drive circuit 54 to connect the clutch mechanism, and the zoom potentiometer 43 and the focus potentiometer 46 Based on the outputted current zoom position and focus position, the angle of view correction data stored in the memory 50 is read to calculate a zoom correction position signal. The corrected position signal is calculated by the calculation circuit 56 with the detection output of the potentiometer 43,
Is returned to the CPU 4.
By driving the zoom motor 35 via the drive circuit 9 and the drive circuit 53, the zoom lens is driven in a direction in which the angle of view is corrected.

This embodiment has the above configuration, and its operation will be described below. FIG. 4 shows that the clutch mechanism is connected,
This is the state when the zoom switch 20 is pressed, but when the zoom switch 20 is released, the clutch operation motor 37 rotates, and the moving gear 31 of the screw connection is rotated via the shaft gear 38. By doing so, the members from the moving gear 31 to the movable plate 26 are moved to the front side (left side in the figure). As a result, the movable plate 26 becomes the fixed plate 27
And is disconnected.

Thus, when the zoom switch 20 is not operated, the zoom operation ring 18 can be operated manually, and the zoom lens can be driven in accordance with the operation direction. At this time, simultaneously with the rotation of the zoom operation ring 18, the movable plate 26 and the coil spring 28 are also rotated by the coupling with the movable plate outer teeth 26G.
Since the movable gear 31 is freely rotatable with respect to the moving gear 31, no load that hinders the operation is generated.

Next, when the zoom switch 20 is depressed, the clutch operation motor 37 rotates based on the calculated value of the electric control voltage and the position voltage of the potentiometer 41,
By moving the movable gear 31 screwed to the main shaft 25 to the rear side, the movable plate 26 is pressed against the fixed plate 27 via the coil spring 28 as shown in FIG. By the coupling connection of the clutch mechanism, the rotation of the zoom motor 35 is transmitted to the zoom operation ring 18 via the gear 36, the fixed plate external teeth 27G, and the movable plate external teeth 26G. As a result, the zoom lens is automatically driven in accordance with the operation direction and the pressing amount of the zoom switch 20.

When the focus switch ring 17 is driven manually or electrically in a state where the depression of the zoom switch 20 is released and the zoom operation can be performed manually, the angle of view (pumping correction) is corrected. The zoom operation including this correction is shown in FIG.

In FIG. 2, in step 101, the operation signal (Z) of the zoom switch 20 is read, and in step 102, it is determined whether or not the operation signal Z is 0. When "NO", step 103 is executed. Move to. In step 103, it is determined whether or not the zoom clutch mechanism is connected and connected. If "NO", the clutch mechanism is connected in step 104. If "YES", in step 105, the zoom switch 20 is connected. Is D / A converted and output. Here, the zoom motor drive circuit 53 is operated by the zoom motor 35 based on the zoom operation signal.
Is operated to drive the zoom lens to a predetermined position.

On the other hand, in step 102, "YE
At S ", that is, at the time of manual zoom setting, the process proceeds to step 106, where it is determined whether or not the zoom clutch mechanism is connected. Here," YES "
In step 107, the zoom clutch mechanism is disconnected in step 107. If "NO" in step 106, the process proceeds to step 108, and the potentiometer 4
The current focus position and zoom position detected at steps 3 and 46 are read. In the next step 109, it is determined whether or not the focus position has been moved by the focus operation ring 17 while the zoom position is the same position as the previous time.
When S ", that is, when the focus operation is performed in the standby state of the manual zoom operation, it is determined in step 110 whether or not the zoom clutch is engaged, and the angle of view correction operation is performed.

That is, since the clutch is not connected in the zoom manual standby state, "NO" is made in step 110, and in step 111 the zoom operating motor 37 is operated to connect the clutch mechanism. If “YES” in the above step 110, step 11
In step 2, the zoom position for the angle of view correction is calculated by reading out the angle of view correction data corresponding to the current zoom position and focus position from the memory 50, and the next step 113 is executed.
Outputs the zoom correction position signal to the arithmetic circuit 56 via the D / A converter 55. Then, the arithmetic circuit 56 outputs an arithmetic signal (control signal) of the corrected position signal and the current position signal output from the zoom potentiometer 43 to the CPU 49, so that the zoom motor 35 is controlled based on the arithmetic control signal. The zoom lens is driven to move to the corrected zoom position. As a result, the angle of view corresponding to the pumping is corrected.

FIG. 5 shows an example of the angle of view correction described above. As shown by the arrow, the angle of view is set such that the closer the focus distance is, the more the zoom moves to the wide side. If it changes, the angle of view is corrected by moving the zoom to the tele (telephoto) side. For example, if the zoom is d0
If the zoom is now at the position of a3 and the focus is set to the distance d1, the lens moves to the position of a31 and the angle of view becomes a3 '. Therefore, the zoom is shifted from the position a31 to a31 '.
By correcting the angle of view, the angle of view becomes equal to the angle a3.
As a result, the image slightly enlarged by the focus operation is reduced, and the change in the angle of view is substantially eliminated. That is, by performing a movement that cancels the change in the angle of view by the zoom function, the angle of view can be kept constant.

[0030]

As described above, according to the present invention,
A clutch mechanism for connecting and disconnecting the rotation of the electric motor to and from the zoom operation ring, a clutch operating motor for connecting and disconnecting the clutch mechanism are provided, and a focus operation is performed when the zoom is manually set. In this case, since the clutch mechanism is connected using the above-mentioned clutch operating motor and the angle-of-view correction means for correcting the angle-of-view change due to focusing is provided, the conditions for the subject can be quickly adjusted without manual or automatic switching operation. In addition to this, there is an advantage that the angle of view can be maintained constant by correcting the pumping phenomenon that occurs during the focus operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a manual and electric device of a lens barrel capable of performing pumping correction according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a pumping correction (angle of view correction) operation in the embodiment.

FIG. 3 is a diagram illustrating an overall configuration of an apparatus according to an embodiment.

FIG. 4 is a view showing a mechanical structure of a part of FIG. 3, in which a clutch mechanism is in a connected state.

FIG. 5 is an explanatory diagram illustrating an example of pumping correction.

FIG. 6 is a diagram showing the structure of a conventional lens barrel that can be switched between manual and electric.

[Explanation of symbols]

1,14 ... lens barrel, 3,18 ... zoom operation ring, 4,19,26G, 27G ... external teeth, 7,35
… Zoom motor, 17… focus operation ring,
20 zoom switch, 26 movable plate (gear movable plate), 27 fixed plate (gear fixed plate), 31
Moving gear, 37 ... clutch operating motor, 41, 4
3, 46… Potentiometer, 49… CP
U, 50: angle-of-view correction data, 56: arithmetic circuit.

Claims (1)

[Claims] 1. An electric motor for automatically moving a zoom lens disposed on a lens barrel, and a zoom operation rotatably disposed on an outer peripheral portion of the lens barrel for manually moving the zoom lens. A ring, a clutch mechanism for connecting and disconnecting the connection between the zoom operation ring and the electric motor, a clutch operating motor for connecting and disconnecting the clutch mechanism, and a focus operation performed when the zoom is manually set. When done
A manual and electric device for a lens barrel capable of pumping correction, comprising: an angle-of-view correcting means for connecting the clutch mechanism using the clutch operating motor and correcting a change in the angle of view due to focusing.