JPH08149349A - Television lens device - Google Patents

Abstract

PURPOSE: To transmit a torque smoothly in a motor driven state and a manual drive state. CONSTITUTION: A motor 22 and an electric circuit 23 for controlling the motor 22 are built in a lens device main body 21 and the torque of the output shaft of the motor 22 is delivered to a rotary shaft 25 via gear members 24, 26. Furthermore, the torque of the rotary shaft 25 is delivered to a cam cylinder 28 to drive a lens group via a torque transmission mechanism 27. On the other hand, the lens device main body 21 is provided with a housing member 34 to connect a flexible controller and when the flexible controller is connected to the main body, the torque is delivered to the rotary shaft 25 via gear members 30, 26 and a power to the motor 22 is interrupted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television lens device which is used by appropriately selecting manual operation or electric operation for optical adjustment of zoom or focus.

[0002]

2. Description of the Related Art Conventionally, when a zoom or focus operation is performed in a television lens device, particularly a large lens, an electric servo operation is performed by connecting a drive means called a servo module and an operation means called a demand device. Or a manual torque transmission system such as a flexible module, a cable, or a controller is connected to manually select a method.

FIG. 7 is a block diagram of a television lens device in which a servo module is mounted and electrically operated. The output of the demand device 1 having an operation ring 1a is sent to a servo module 3 having a built-in motor via an electric circuit 2. A coupling 5 is formed at the tip of the output shaft 4 of the servo module 3 which is connected. On the other hand, a rotary shaft 7 is rotatably supported by the lens device body 6, and a coupling 8 capable of meshing with the coupling 5 is attached to one end of the rotary shaft 7.

Further, a cam barrel 11 for moving a focus or zoom lens group 10 is connected to the other end of the rotary shaft 7 via a torque transmission mechanism 9 such as a belt. When the servo module 3 is attached to the lens device body 6, the couplings 5 and 8 are meshed with each other, and by rotating them integrally, the power of the servo module 3 is transmitted to the lens device body 6.

When performing an operation of focusing or zooming, when the operator of the television lens device rotates the operation ring 1a of the demand device 1, a drive command signal corresponding to the rotation angle is output to the electric circuit 2 to generate an electric signal. The circuit 2 processes this drive command signal to rotate the motor in the servo module 3. The torque of this motor is transmitted from the output shaft 4 to the rotary shaft 7 via the couplings 5 and 8, and the rotational torque of the rotary shaft 7 is further transmitted to the cam barrel 11 via the torque transmission mechanism 9, thereby making the cam The cylinder 11 rotates. As a result, the lens group 10 moves to a predetermined position, and optical adjustment for focusing or zooming is performed.

On the other hand, FIG. 8 is a block diagram of a television lens device in which a flexible module is attached and a manual operation is performed, and the same reference numerals as those in FIG. 7 denote the same members. The output of the flexible controller 15 having the operation knob 15a is supplied to the base 17 of the flexible module 17 via the base 15b and the flexible cable 16 which can be bent.
Output shaft 1 of flexible module 17 connected to a
A coupling 5 is formed at 8 and can be meshed with the coupling 8.

The flexible cable 16 is formed by holding a string-shaped metal member inside a tubular member, and is capable of transmitting a rotational torque from one end to the other end. When the flexible module 17 is attached to the lens device body 6 during assembly, the couplings 5, 8
Mesh with each other and rotate integrally.

When the operator manually rotates the operation knob 15a of the flexible controller 15 during focusing or zooming operation, a rotating torque is output from the mouthpiece 15b of the flexible controller 15, and the rotating torque is output via the flexible cable 16. 17
It is input to the flexible module 17 from a. As a result, the output shaft 18 of the flexible module 17 rotates, and the rotation shaft 7 of the lens device body 6 also rotates via the couplings 5 and 8. After that, focusing or zooming operation is performed as in the case of FIG. Be seen.

[0009]

As in the conventional example described above, the servo module 3 and the flexible module 17 are provided.
In order to change the electric or manual operation method by detaching and replacing the rotating shaft 7, the output shafts 4, 18 as shown in FIGS.
When the couplings 5, 8 for attachment / detachment and replacement are provided in the device, the shaft diameter of the couplings 5, 8 must be increased to some extent in order to allow the operator to easily attach / detach the module and maintain durability. There is.

However, since the moments of inertia of the rotating shaft 7 of the couplings 5 and 8 and the output shafts 4 and 18 are proportional to the fourth power of the shaft diameter, when the rotating shaft 7 and the output shafts 4 and 18 become large in inertia, The moment increases rapidly, and the load torque during acceleration rotation increases accordingly. Therefore, when a higher speed zooming or focusing operation is required during the electric operation, a very large electric power is required. Generally, the television lens device is supplied with electric power from the television camera, and the amount of electric power is limited, so that it is difficult to speed up the operation of the lens group 10.

In the conventional television lens device,
When the modules 3 and 17 are attached, the rotation center axes of the couplings 5 and 8 on the lens device main body 6 side and the modules 3 and 17 side are displaced from each other. The fluctuation of the load torque when the central shaft rotates becomes large. For this reason, the feeling of operation is reduced during manual operation, and the change in the angle of view during zooming is not smooth during electric operation.

Therefore, conventionally, this problem has been dealt with by improving the processing accuracy and the assembly accuracy of the members related to the attachment of the couplings 5 and 8 and the modules 3 and 17, but the cost is inevitably increased. There is a problem.

Further, in order to make the modules 3 and 17 detachable and replaceable, the coupling 5, the members constituting the output shaft 18 and the casing members of the modules 3 and 17 are required.
This is a barrier to reducing the size and weight of the entire lens device body 6.

In the conventional TV lens apparatus, the mounting portions of the modules 3 and 17 are complicated in shape and many connecting portions of the members are exposed, so that the inside and outside of the lens apparatus main body 6 are completely separated. It is difficult to do so, and as a result, water vapor in the atmosphere may enter the inside of the lens device, resulting in fog on the surface of the lens group 10 inside.

An object of the present invention is to solve the above problems,
It is an object of the present invention to provide a television lens device capable of smoothly transmitting torque during electric operation and manual operation.

[0016]

In order to achieve the above object, a television lens device according to the present invention is provided with a moving lens group for performing optical adjustment such as focus and zoom, and for moving the moving lens group. A drive shaft, a motor that is disposed in the lens housing and serves as a power source during electric operation, a switch that switches connection between terminals of the motor, and a connection mechanism that connects an operation system connection member during manual operation. The connecting mechanism transmits the rotational torque of the operating system connecting member to the drive shaft when the operating system connecting member is connected, and turns off the switch.

[0017]

In the television lens device having the above-mentioned structure, since the terminals of the motor are connected during the electric operation, optical adjustment is performed by transmitting the rotational torque of the motor to the drive shaft, and the operation system is connected during the manual operation. The member is connected to the connecting mechanism and the switch is turned off to cut off the current between the terminals of the motor, and the rotational torque of the operating system connecting member is transmitted to the drive shaft to perform optical adjustment.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. 1 is a block diagram of the first embodiment, FIG.
FIG. 2 is a front view seen from the direction A in FIG. 1, showing a state during electric operation. An electric circuit 23 that controls a lens driving motor 22 is provided inside the lens device body 21, and a gear member 24 is attached to an output shaft of the motor 22. On the left side of the motor 22, the lens device body 21
A rotary shaft 25 rotatably supported is provided on the right end of the rotary shaft 25. A gear member 26 that constantly meshes with the gear member 24 is attached to the right end of the rotary shaft 25. A torque transmission mechanism such as a belt is attached to the left end of the rotary shaft 25. A cam barrel 28 having a cam groove 28 a for moving the lens group is connected via 27.

Below the motor 22, a shaft member 29 is provided.
Is supported so as to be rotatable and axially movable with respect to the lens device main body 21, and the gear member 26 is provided at the left end thereof.
A gear member 30 adapted to mesh with is attached. A ring-shaped member 31 is fixed to the shaft member 29, and a spring member 32 is circumferentially provided so as to abut the ring-shaped member 31, and the spring member 32 always biases the ring-shaped member 31 to the right. are doing. A switch 33 that short-circuits the motor 22 and the electric circuit 23 is provided above the ring-shaped member 31, and when the ring-shaped member 31 moves to the right, the switch 33 is pushed in and turned on. The switch 33 is turned off when the ring-shaped member 31 moves to the left.

The shaft member 29 is formed at its right end with a two-way taking portion 29a, and a housing member 34 is fixed to the lens apparatus body 21 so as to cover the two-way taking portion 29a.
Further, the bearing member 3 is provided inside the housing member 34.
A rotary member 36 having a hole portion 36a and a slot portion 36b is rotatably provided via 5, and a two-way take-up portion 29a of the shaft member 29 is fitted to a slit portion 36b of the rotary member 36.

FIG. 3 is a block diagram when a flexible controller is connected. The other end of the flexible cable 37 connected to the flexible controller is a two-way chamfer that can be fitted into the slotted portion 36b of the rotating member 36. 37a
Is formed, and a screw member 38 that can be screwed into the housing member 34 is provided around the two-sided take-up portion 37a.

During electric operation, when the operator separately operates a demand device (not shown) connected to the electric circuit 23 without connecting the flexible controller as shown in FIG. In this state, the switch 33 is in the ON state, so the electric circuit 23
Processes the drive command signal to rotate the motor 22. The torque of the motor 22 is transmitted to the rotary shaft 25 via the gear members 24 and 26, and the rotary torque of the rotary shaft 25 is further transmitted to the cam barrel 28 via the torque transmission mechanism 27, whereby the cam barrel 28 is rotated. Rotates.

As a result, the lens group is moved by the action of the cam groove 28a of the cam barrel 28, and focusing or zooming operation can be performed. At this time, since the gear member 30 is not meshed with the gear member 26, the shaft member 2
The rotation of 9 is not transmitted to the rotary shaft 25.

When the flexible controller is used, the operator first fits the two-way cutout portion 37a of the flexible cable 37 into the slit portion 36b of the rotating member 36 as shown in FIG. It is screwed onto the member 34. As a result, the shaft member 29 is pushed leftward, the gear member 30 is meshed with the gear member 26, and the pressing of the ring-shaped member 31 against the switch 33 is released, so that the switch 33 is turned off. .

When the operator manually rotates the flexible controller in this state, this rotating torque is transmitted to the shaft member 29 via the flexible cable 37 and the rotating member 36, and further rotated via the gear members 30 and 26. It is transmitted to the shaft 25. When the rotary shaft 25 rotates, the lens group is driven as in the electric operation, and the focusing or zooming operation can be performed. In this way,
By attaching or detaching the flexible cable 37, it is possible to switch between manual operation and electric operation.

In this embodiment, the gear shafts 24 and 26 are meshed with each other even during manual operation with the flexible controller connected, so that the output shaft of the motor 22 rotates. At this time, since the terminals of the motor 22 are released by the switch 33, the bearing friction torque of the motor 22 is applied to the flexible controller.

Generally, in manual operation, in order to prevent a so-called self-focusing or self-weighting zoom phenomenon in which the lens group moves due to its own weight when the lens apparatus body 21 is tilted, or to improve the operation feeling, It is considered that the operation torque should have a certain load, and the operation torque is applied by providing an appropriate load torque generating mechanism in the drive system. Since the bearing friction torque of the motor 22 is much smaller than this operating torque, the rotational torque is the same as that of the gear member 2.
Even if it is transmitted from 4 to the output shaft of the motor 22, it does not affect the feeling of manual operation.

On the contrary, in the conventional TV lens, if the servo module is not used for a long time, an oxide film or the like may be formed on the brush portion of the motor. Performance may be degraded until the film is broken. However, in this embodiment, even if the flexible controller is connected and the manual operation is performed, the motor 22 is rotating, so that an oxide film is not formed and the performance is deteriorated at the next electric operation. Can be used without.

FIG. 4 is a block diagram of the second embodiment, and FIG. 5 is FIG.
2 is a front view seen from the direction B, showing a state at the time of electric operation similarly to FIG. 1, and FIG. 6 shows a configuration diagram of a state at manual operation in which a flexible controller is connected. An electric circuit 43 for controlling a lens driving motor 42 is provided inside the lens device body 41, and a gear member 44 is attached to an output shaft of the motor 42. A rotation shaft 45 rotatably supported by the lens device body 41 is provided on the left side of the motor 42, and a gear member 46 that constantly meshes with the gear member 44 is attached to the right end of the rotation shaft 45. . Further, a cam groove 48 for moving the lens group is provided on the rotating shaft 45 via a torque transmitting member 47 such as a belt.
A cam cylinder 48 having a is connected.

Further, a slit portion 45a is formed on the left end of the rotary shaft 45, and a housing member 49 is fixed to the lens device body 41 so as to cover the left end of the rotary shaft 45. Inside the housing member 49, the long hole 5
A ring-shaped member 50 having 0a is rotatably provided. As shown in FIG. 6, a switch 52 is provided near the housing member 49 and can be turned on and off when the screw member 51 of the flexible controller is connected. This switch 52 is normally turned on,
The motor 42 and the electric circuit 43 are short-circuited so that they are turned off when the screw member 51 is screwed into the lens device body 41.

Further, as shown in FIG. 6, in the flexible controller, the two-way cut portion 53a formed at the tip of the flexible cable 53 is provided in the elongated hole 50 of the ring-shaped member 50.
The rotational torque can be transmitted to the rotary shaft 45 by fitting the slotted portion 45a of the rotary shaft 45 through a.

During electric operation, the operator may operate the demand device without connecting the flexible controller as shown in FIG. At this time, since the switch 52 is in the ON state, the drive command signal output from the demand device is processed by the electric circuit 43 and the motor 42
To rotate. Similar to the first embodiment, the torque of the motor 42 is transmitted to the rotary shaft 45 via the gear members 44 and 46, and the rotary torque of the rotary shaft 45 is transmitted to the cam barrel 48 via the torque transmission member 47. By doing so, the cam cylinder 4
8 rotates, and the lens group can be driven by the action of the cam groove 48a of the cam barrel 48.

Next, when performing a manual operation using the flexible controller, first, as shown in FIG. 6, the two-way chamfered portion 53a of the flexible cable 53 is passed through the elongated hole 50a of the ring-shaped member 50. Then, the rotary shaft 45 is fitted into the slotted portion 45a, and at the same time, the screw member 51 is screwed into the housing member 49. This allows switch 5
2 is turned off, and when the operator manually rotates the flexible controller in this state, the rotation torque is transmitted to the rotation shaft 45, and the rotation of the rotation shaft 45 drives the lens group as in the electric operation. can do.

In the second embodiment, the same effect as that of the first embodiment can be obtained, but the structure is simpler than that of the first embodiment, so that the size, weight and cost can be reduced. be able to. Further, since the gear transmission system such as the gear members 26 and 30 in FIG. 1 is not used during the manual operation, the feeling of operation can be improved as compared with the first embodiment without being affected by the backlash between the gears. .

The switch 52 may be short-circuited between the terminals of the motor 42 instead of being turned off when pushed.

[0036]

As described above, in the television lens device according to the present invention, the axial coupling between the module and the lens device body can be eliminated, so that the moment of inertia of the drive shaft can be made small, and at the time of electric operation, a high speed can be achieved even with a small electric power. Various operations are possible. Further, since the load torque fluctuation due to the misalignment of the coupling is eliminated, the operational feeling is not deteriorated during the manual operation, and the optical adjustment in which the angle of view is smoothly changed during the electric operation can be realized at low cost.

Further, since the motor is built in the lens device, the members related to the coupling and the housing member of the module can be eliminated, and the size and weight can be greatly reduced.
Further, since the portion protruding to the outside of the lens device is only the connecting portion of the operation system connecting member, and the external shape is simple,
It is possible to easily seal the inside of the device and prevent fogging inside. Further, there is an advantage that it is not necessary to perform the complicated work of exchanging the module while maintaining the conventional usability of the TV lens, that is, appropriately selecting and using the manual operation and the electric operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a front view seen from the direction A in FIG.

FIG. 3 is a configuration diagram at the time of manual operation.

FIG. 4 is a configuration diagram of a second embodiment.

5 is a front view seen from the direction B in FIG. 4. FIG.

FIG. 6 is a configuration diagram at the time of manual operation.

FIG. 7 is a configuration diagram of a conventional television lens with a servo module attached.

FIG. 8 is a configuration diagram of a conventional TV lens to which a flexible module is attached.

[Explanation of symbols]

 21, 41 Lens device main body 22, 42 Motor 23, 43 Electric circuit 24, 45 Rotating shaft 28, 48 Cam cylinder 29 Shaft member 31, 50 Ring member 32 Spring member 33, 52 Switch 34, 49 Housing member 36 Rotating member 37 , 53 Flexible cable 38, 51 Screw member

Claims (2)

[Claims] 1. A moving lens group for performing optical adjustments such as focusing and zooming, a drive shaft for moving the moving lens group, and a motor which is arranged in the lens housing and serves as a power source during electric operation. A switch for switching connection between terminals of the motor, and a connection mechanism for connecting an operation system connection member during manual operation, the connection mechanism including the operation system when the operation system connection member is connected. A television lens device, characterized in that the rotational torque of a connecting member is transmitted to the drive shaft to turn off the switch. 2. The television lens device according to claim 1, wherein the connection between the terminals of the motor is switched by short-circuiting the terminals of the motor.