JPH07113939A - Photographing device - Google Patents

Abstract

PURPOSE:To reduce power consumption, to adjust operational feeling and to reduce the time required for maintenance by providing a means continuously imparting a load generated in the outside to an operation part only at the manual time and a means adjusting the load from the outside. CONSTITUTION:At the time of manual operation, the load generated in a lens barrel main body 2 is suppressed minimally, and the load generated in a load generation part 11 is transmitted to a roller 6 by a shaft 7. The roller 6 pressed to an operation ring 1 around the shaft 4 together with a roller base 5 by a spring 10. By the pressed roller 6, the load of the load generation part 11 is imparted to the operation ring 1 continuously. Thus, an operator feels that the load is applied to the operation ring 1 continuously. In this system, the torque is generated by pressing a friction member to the roller shaft 7 in the load generation part 11 and is transmitted to the roller, thereby the revision of the torque is facilitated, and the load torque is changed by varying the pressing force of the friction member by an adjusting screw.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device capable of electrically and manually driving zooming, focusing, iris diaphragm, etc. of a photographing lens, and is particularly suitable for a photographing device of a television camera.

[0002]

2. Description of the Related Art Conventionally, a photographing apparatus in this field has a cam mechanism inside a lens barrel of a lens or a mechanism for converting a rotational movement by a feed screw into a linear movement, and the sliding portion has a reduced friction coefficient. Grease (sliding agent) is applied for the purpose of improving the wear resistance or suppressing the instability due to the mass of the lens itself.

FIG. 7 shows a part of the taking lens barrel, and reference numeral 29 is, for example, a variator lens group. However, the compensator lens group or other lens groups are omitted. Further, x is an optical axis, and the lower side of the optical axis is not shown. Reference numeral 30 denotes an inner cylinder that holds the lens group. Reference numeral 31 is a main body of the lens barrel, 32 is a zoom cam barrel, and the holding ring 33 positions the lens barrel main body 31 in the direction along the optical axis, and has a degree of freedom in the rotational direction. Reference numeral 34 denotes a cam roller, which is engaged with the linear groove 31a in the optical axis direction of the lens barrel body and the cam groove 32a of the zoom cam barrel 32, and is integrally connected to the inner barrel 30. A zoom operation ring 35 is rotatable around the lens barrel main body 31 and is connected to the zoom cam cylinder 32 by a connecting shaft 36. Therefore, when the operation ring 35 is rotated, the lens group 29 is not shown in the compensator group. Zooming is executed in conjunction with.

If 29 is a focusing lens group, 35 is a focus ring, and if the connecting shaft 36 is associated with a drive lever of the iris diaphragm, 35 is a diaphragm setting ring.

In the case of such a drive mechanism, first, the operation ring 35
There is friction between the lens barrel body 31 and the lens barrel body 31, and between the lens barrel body 31, the cam barrel 32, and the pressing ring 33. In addition, the friction generated between the cam roller and the cam groove is the force that propels the lens.

If grease is applied to the portion where the friction is generated, a viscous load is generated. It was a general method to adjust the operation feeling of the operation ring by the load due to grease viscosity.

[0007]

However, in the above-mentioned conventional example, considering the improvement of the operation feeling and the instability due to its own weight, a large viscous load due to this grease must be taken, and the power consumption during operation and the operating speed Considering the above, the viscous load must be made as small as possible, and the characteristics were contradictory.

Further, this load varies depending on the preferences of the photographer, the subject to be photographed, and the photographing environment, and there is no value satisfying all of them.

Further, considering the lens driving mechanism, it is very troublesome to change this grease frequently and to change it to the above-mentioned situation as needed, and in a high-performance photographing apparatus, after the disassembly, Due to the difficulty of optical adjustment, it was not possible for anyone to replace it.

It is an object of the present invention to provide a device which can reduce power consumption, can adjust the operation feeling, and can reduce the maintenance work.

[0011]

In an image pickup apparatus in which an operation unit can be switched between electric drive and manual drive,
There are provided means for continuously applying a load generated outside only to the operating section to the operating portion in conjunction with switching between electric and manual operations, and means for adjusting the load from the outside. At this time, if the operation section is taken as an example, it is an operation section for zooming, focusing, or an iris diaphragm, which is provided on the taking lens barrel. Further, as a means for applying, it is desirable that a roller, a belt, or wires are arranged in contact with the operation portion.

[0012]

1 (A) and 1 (B) show an essential part of an embodiment of the present invention, in which (A) is a front view and (B) is a side view.

Reference numeral 1 is an operating ring, which corresponds to reference numeral 35 in FIG. 7 and is rotatable about the optical axis. Reference numeral 2 denotes a lens barrel main body, which corresponds to 31 in FIG. 6, and has a lens, a lens driving mechanism, or an iris diaphragm built therein. Reference numeral 3 denotes a base body of the external load generator, which is fixed to the lens barrel body 2. 4 is the rotation axis of the roller base, 5 is the roller base, 6 is the roller, 7 is the roller shaft, 8 is the roller spring-supporting shaft,
Reference numeral 9 is a main body side spring hanging shaft. A coil spring 10 is hung between the spring hanging shafts 8 and 9. Reference numeral 11 is a load generation unit, which will be described in detail later. At the time of electric drive, the roller 6 is separated from the operation ring 1 by a method described later so that the load generated by the load generation unit 11 is not transmitted to the operation unit.

The state of FIG. 1 shows the load transmission state during manual operation. Here, the load generated in the lens barrel body 1 is minimized, and the load generated in the load generation unit 11 is transmitted to the roller 6 by the shaft 7. The roller 6 is pressed against the operation ring 1 by the spring 10 together with the roller base 5 around the shaft 4. The pressed roller 6 continuously applies the load of the load generator 11 to the operation ring 1. As a result, the photographer feels that the operation ring 11 is continuously added.

Here, being continuous means that there is no backlash that occurs in the case where this transmission is transmitted by a gear or the like. If backlash or the like occurs in the transmission system, it will appear on the operation ring, causing the photographer to feel a discontinuous load. Even with a high-end photography device that requires a delicate operation force, a small break in the backlash cannot be tolerated. Of course, when this becomes a terrible thing, the painting itself becomes discontinuous and unusable. On the contrary, if the backlash is packed, it will convey a slight delicate snag on the tooth flank of the gear on the operation ring. In order to achieve a smooth transmission, continuous transmission by rollers is used here. It is currently known that the roller and the contact curved surface of the operation ring should be processed with rubber or a roughened surface in order to reduce slippage, but there is also a method in which the spring pressure is high and not used.

Next, the load generator 11 will be described with reference to FIGS.
Each will be explained.

FIG. 2 shows the friction member 12 with respect to the roller shaft 7.
Is a load torque generating device of a type that pushes against to generate torque and transmits it to the roller. The torque can be easily changed with this device, and the load torque can be changed by changing the pressing pressure of the friction member 12 with an adjusting screw (not shown). In this case, the shape can be simple, the size is small, and the cost is low.

FIG. 3 shows an apparatus for generating a load so as not to change the feel of a conventional viscous resistance.
A plurality of blades 13 containing grease or other fluid inside the caging 1 and attached to the roller shaft 7 therein.
Is arranged, and the blade 13 rotates to obtain a load. In this case, since the load is only due to the viscous resistance, there is an effect that a load sensitivity similar to the conventional one can be obtained. Reference numeral 14 is a load adjusting knob. When the knob 14 is turned, the angle of the blade 13 is changed, and the viscous resistance is changed. In this device, it is possible to change the contact area by changing the angle of the blades, change the amount of grease, or change the viscous fluid.

FIG. 4 is an eclectic version of the device shown in FIGS. 2 and 3, in which the minimum value of the torque required during manual operation is indicated by the reference numeral 15 as a small fixed load type oil damper (fixed load type). Oil dampers are available off-the-shelf and can be purchased). By connecting the load of the oil damper 15 to the shaft 7 so that the load can be continuously transmitted, the load is transmitted to the roller 6. With this oil damper, it is possible to prevent the load characteristic due to the conventional viscosity from being uncomfortable, and the remaining variable load portion can be compensated by the load due to the friction generated in the friction member 12 as described with reference to FIG. The advantages of this method are
It is possible to make it small and inexpensive without changing the feeling much.

Next, a method of disconnecting the load transmission system during electric operation will be described with reference to FIGS.

The members numbered 1 to 15 are the same as the members with the same numbers in FIG. Reference numeral 16 denotes an electric drive motor, which is controlled by a seesaw-type switch (not shown) to rotate in the forward and reverse directions. Reference numeral 17 denotes an idler gear shaft having a tapered portion formed at its tip. Reference numeral 18 denotes a switching knob for switching between electric operation and manual operation, and the switching operation is performed from the outside of the casing not shown. Reference numeral 19 is a switching shaft that is implanted in the base body of the switching knob. Reference numeral 20 denotes an idler gear, which is fixed to an idler gear shaft 17, and during electric operation, the idler gear 20 meshes with a motor output gear 22 on the one hand and an external gear 1a provided on the surface of the operating ring 1 on the other hand. Reference numeral 21 denotes two switching bearings, which are fixed to the idler gear shaft 17 and sandwich the switching shaft 19. Therefore, when the switching knob 18 is rotated around the shaft 23, the switching shaft 19 pushes one of the switching bearings 21. Idler gear shaft 1
7 moves in the axial direction.

The operation of the switching mechanism will be described below. FIG. 5 depicts the position during electric operation. First, when the switching knob 18 is switched to the electric side from the manual operation position, the switching shaft 19 moves to the lower left in the drawing (position in the drawing), and the bearing 21 moves in the same direction. Therefore, the idler gear shaft 17
And the idler gear 20 also move in the same direction.

The tapered portion at the tip of the idler gear shaft 17 pushes up the roller base 5 with the shaft 4 as the center of rotation, as shown in FIG. 5 (A). As a result, the roller 6 is separated from the operating ring 1 and the load is removed. At the same time, the idler gear 20 transmits the output of the motor 16 to the external gear 1a, and the electric drive is executed.

Next, the case where the switching knob 18 is switched to the manually operated position will be described. Switching knob 1
When 8 is switched clockwise, the switching shaft 19 moves in the upper right direction in FIG. The shaft 19 hits the right bearing 21 to move the idler gear shaft 17 and the idler gear 20 to the right. The idler gear 20 is disengaged from the output gear 22 of the motor by the movement thereof, and at the same time, the base 5 is rotated downward as shown in FIG. 6 (B), and the roller 6 is pressed against the operation ring 1 by the tension of the spring. The load on the roller is now 1
Granted to. Even if it is switched to the electric mode again and then returned to the manual mode, this method can instantly restore the original set load.

In this embodiment, the roller is pressed by a spring to remove the eccentricity of the roller, the eccentricity of the operating ring, the change of the roller due to temperature change, and the change of the operating ring ring. Absent.

In the switching mechanism, if the frictional load generated between the roller and the operating ring may continue to be generated when the motor is operated, a clutch may be provided on the shaft 7 to disengage the roller without directly separating the roller from the operating ring. Is also good.

FIG. 7 shows a second embodiment. 1 to 1
The member 5 is the same as that of the above-described embodiment, but the difference is that the spring-supporting shaft 8 is fixed to the spring-supporting shaft base 24 that moves with respect to the roller base 5. Although the switching means and the like are the same as those in the first embodiment, the load is not changed by the load generating unit 11, and the tension of the spring 10 is changed by moving the spring mount 24 up and down to change the tension between the operation ring 1 and the roller 6. Change the friction load generated in. The merit of this embodiment is that the mechanism can be simply made and miniaturized, and that the spring pressure change when the thickness of the rubber etc. stuck to prevent slipping changes due to temperature changes (the length of the spring increases because the roller floats up). It can be adjusted).

FIG. 8 relates to the third embodiment. 1
Is the operation ring described above. 25 is a main roller, 26
Reference numerals 27 and 27 are guide rollers for pressing. A flexible rope such as a belt, a rope or a wire of reference numeral 28 is hung on these rollers. Although this example also has the load generation source 11, the load is transmitted via the flexible rope 28 instead of directly pressing the operating ring by the roller. The guide rollers 26 and 27 prevent the belt from floating up so that the transmission portion does not become large.

When switching between the electric mode and the manual mode, a clutch (not shown) mounted behind the main roller 25 is operated to perform separation.

[0030]

As described above, the load inside the lens drive mechanism is kept to a minimum, and a load generator is provided outside the drive mechanism that does not affect the lens drive mechanism. By removing the device and installing a load variable mechanism in the load generator, firstly, the operating current during electric operation can be kept low, by increasing the operating speed and reducing the load on the motor. The noise can be suppressed. Secondly, by increasing the number of load generators added during manual operation, it is possible to suppress instability due to the weight of the lens itself and to suppress instability in speed when the operation unit is moved at a low speed. If the load on the load generator is reduced, the operating unit can be moved at high speed even manually. As a result, the operation force can be freely set according to the photographer's preference, the subject to be photographed, and the photographing environment, and a comfortable photographing apparatus can be provided without causing the photographer to use unnecessary nerves. Thirdly, in terms of manufacturing, the process of setting the characteristics of both manual and electric in good balance,
There is an effect that it is free from service problems such as providing a lens with a desired torque for each user.

[Brief description of drawings]

FIG. 1 is a front view showing a main part of a first embodiment of the present invention.

FIG. 2 is a diagram schematically showing an example of a load generator.

FIG. 3 is a diagram schematically showing another example of the load generating unit.

FIG. 4 is a diagram schematically showing another example of the load generating unit.

FIG. 5 is a perspective view of the first embodiment of the present invention.

FIG. 6 is a diagram for explaining switching between electric operation and manual operation.

FIG. 7 is a partial cross-sectional view of a lens transfer lens barrel.

FIG. 8 is a front view showing a main part of the second embodiment.

FIG. 9 is a front view showing a main part of the third embodiment.

[Explanation of symbols]

 1 Operation Ring 2 Lens Barrel Main Body 5 Roller Stand 6 Roller 10 Spring 11 Load Generation Section 16 Electric Drive Motor 18 Switching Knob 28 Belt

Claims (3)

[Claims] 1. An imaging apparatus capable of switching between an electric drive and a manual drive of an operation unit, wherein a load generated externally is continuously applied to the operation unit only when the operation is manually operated in association with the switching between the electric operation and the manual operation. And a means for adjusting the load from the outside. 2. The photographing apparatus according to claim 1, wherein the operation unit is an operation unit for zooming, focusing or iris diaphragm. 3. The image taking apparatus according to claim 1, wherein the applying means includes a roller, a belt, or wires contacting the operation section.