JPS6027366Y2 - Zooming operation method switching device for zoom lenses for television cameras - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zooming operation mode switching device for a zoom lens for a television camera, which is capable of selectively operating between a uniaxial type and a servo type.

There are two types of zooming operation methods for zoom lenses for television cameras: -axis type and servo type.

-The axial type is equipped with a manual operating rod that can rotate and slide in the axial direction, and focusing is performed by rotating the manual operating rod.
Zooming is performed by sliding in the axial direction.

In the servo type, the amount of rotation of a servo motor is controlled by turning an operating knob, and the servo motor performs zooming.

Regarding the tracking relationship between the operating knob and the servo motor, there are two types: one that rotates the motor at a constant speed regardless of how quickly the operating knob is turned, and one that adjusts the speed of the servo motor depending on how quickly the operating knob is turned. be.

Note that in this servo type, a servo motor for focusing is usually provided to perform focusing separately from zooming.

The former single-axis type allows quick shot changes (changes in screen size), and there is also a one-to-one correspondence between the movement of the manual operating rod and changes in the screen.

This single-axis type has the following advantages, making it suitable for drama shooting.

In other words, it is easy to follow the subject in front of the person's line of sight while changing the screen size as the person quickly moves their line of sight.

On the other hand, the latter servo type has the following advantages and is suitable for filming short shows.

That is, super slow and smooth zooming is easy, and both hands are free, so by holding the camera with both hands, camera work such as dolly-in/out or sideways movement is easy.

In conventional TV cameras, the single-axis type is replaced by a manual module,
In addition, the servo type was unitized into an electric module, and based on the above characteristics, the manual module was attached to the TV camera for drama programs, and the electric module was attached for show programs to change the zooming operation method. .

If the zooming operation method is changed by changing the attachment of this module, it is troublesome to change the zooming operation method, so it is impossible to freely use any zooming method depending on the scene.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, it is an object of the present invention to provide a zooming operation mode switching device that allows easy switching between a uniaxial type and a servo type.

Another object of the present invention is to provide a zooming operation method switching device that can switch the zooming operation method between a uniaxial type and a servo type without changing the attachment of the module. .

In this device, a TV camera is equipped with both a uniaxial drive system and a servo drive system, and a clutch gear is selectively connected to both drive systems to transmit the output of either of the drive systems to the zoom mechanism. This is what I did.

If both a uniaxial drive system and a servo drive system are provided to drive the zoom mechanism independently, the relationship between the pushing position of the manual operating rod and the zoom ratio will not be kept constant.

Therefore, in order to specify the position where the clutch gear is connected to both drive systems, holes are provided on each side of the clutch gear, and the clutch pins that fit into these holes are inserted into the rotating bodies of both drive systems. One clutch pin is provided in each of the holes so that the clutch pins are selectively fitted into the holes, and the rotating bodies of both drive systems are rotated by an angle of less than 360 degrees.

It should be noted that the latch pin and the hole can be interchanged in their installation positions, and in this case should be interpreted as equivalents of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a manual operating rod 1 has an operating bundle 2 and a slide shaft 3 attached to both ends thereof.

This slide shaft 3 is fitted into a sleeve 4, and slides within the sleeve 4 by pushing the operating bundle 2.

Further, the slide shaft 3 is provided with a pin 5 that protrudes in the direction of release, and this pin 5 is connected to a straight groove provided in the sleeve 4.
a and is fitted into the hole 6a of the inner ring 6.

This inner ring 6 is slidably fitted onto the outer periphery of the sleeve 4.

Further, the inner ring 6 has an outer ring 7 having a groove 7a inside.
It is rotatably stored in the

A transmission wire 9 is hung on the outer ring 7, and when the manual operation rod 1 slides, the wire 9 follows this movement.
moves.

This wire 9 is guided by pulleys 10, 11, and 12 and is hung around the outer periphery of a uniaxial drum 13.

A gear 14 is fixed to one end of the sleeve 4,
The rotation of this gear 14 is transmitted to the focusing ring 16 via a transmission system 15.

This focusing ring 16 is screwed into a fixed lens barrel 17 and holds a focusing lens 18 inside thereof.

A servo operating knob 20 is attached to a potentiometer 21, and by turning the operating knob 20, the potential of the potentiometer 21 changes, and the motor 22 rotates using this potential as a target value.

A drive gear 23 is fixed to a rotating shaft 22a of this motor 22.

The rotation of the drive gear 23 is transmitted to the driven gear 25 via the intermediate gear 24.

This intermediate gear 24 is fixed to a shaft 26a of a potentiometer 26 provided to actually measure the amount of rotation of the motor 22.

The output signals of the potentiometers 21 and 26 are input to a servo circuit 27, and their magnitude relationship is determined.
A signal indicating the direction of rotation is output.

The output signal of this servo circuit 27 is sent to a drive circuit 28 to control the rotation of the motor 22.

The drum 13 with the negative shaft angle and the servo driven gear 25 are rotatably supported by a shaft 31 whose one end is fixed to the case 30.

The drum 13 and the driven gear 25 are maintained at a constant distance by a spacer 32 fitted to the shaft 31.

A clutch gear 33 is slidably and rotatably fitted into this spacer 32.

As shown in FIGS. 2 and 3, this clutch gear 33 is provided with holes 33a and 33b on both sides thereof, respectively.

Further, an annular groove 33c is formed on the outer periphery of the clutch gear 33, into which the tip of the switching shaft 34 is inserted.

The switching shaft 34 is fixed to a switching operation knob 35 that switches the operation method to either a uniaxial type or a servo type.

When the switching operation knob 35 is slid to the left end, the clutch gear 33 moves to the left and is connected to the drum 13, so that the operation method becomes a uniaxial type.

When the switching operation knob 35 is slid to the right end, a microswitch 36 provided in the power circuit of the motor 22 is turned on, and at the same time, the clutch gear 33 is connected to the driven gear 25 and the operation method is switched to the servo type.

In order to connect the clutch gear 33 to the drum 13,
Clutch pin 3 that engages with hole 33a of clutch gear 33
8 is provided on the side of the drum 13.

This clutch pin 38 is housed in the hole 13a, and is biased from behind by a spring 39 in the direction of protrusion.

Similarly, the driven gear 25 is also provided with a clutch pin 40 that engages with the hole 33b of the clutch gear 33.

Since the clutch gear 33 and the drum 13 or the driven gear 25 are mechanically connected through holes 33a, 33b and clutch pins 38.40, there is only one connection position.

However, when the drum 13 rotates more than once, the clutch gear 33 rotates around the drum 1 at different pushing positions of the manual operating rod 1.
Connect to 3.

As a result, the pushing position of the manual operating rod 1 and the zoom ratio of the zoom lens do not correspond one-to-one.

To prevent this, it is provided that the drum 13 can rotate by less than 360 degrees during the push-in stroke of the manual operating rod 1.

That is, as shown in FIG. 2, when the clutch gear 33 is connected to the drum 13, it rotates by an angle θ from the solid line position to the two-dot chain line position shown in FIG.

In accordance with this, the clutch gear 33 also rotates by an angle θ as shown in FIG. 3 when connected to the driven gear 25.

A clutch gear 33 selectively connected to a uniaxial drive system and a servo drive system meshes with a gear 42a formed on the outer periphery of the cam cylinder 42.

This cam cylinder 42 is formed with cam grooves 42b and 42c for the variator and the compensator, respectively.

The cam barrel 42 is rotatably fitted to the outside of the fixed lens barrel 17.

This fixed lens barrel 17 is provided with straight lines 117a and 17b for the variator and compensator, respectively.

The lens holding frame 44 holding the variator lens 43 is
It has a ring shape, and a pin 45 implanted on its outer peripheral edge passes through the linear groove 17a and fits into the cam groove 42b.

Lens holding frame 47 holding compensator lens 46
A pin 48 implanted on the outer peripheral edge thereof is fitted into the linear groove 17b and the cam groove 42c.

These fixed lens barrel 17, cam barrel 42, lens holding frame 44
．． 47 etc. constitute a zoom mechanism.

Next, the operation of the above embodiment will be explained.

In the state shown in FIG. 1, the clutch pin 38 is engaged with the hole 33a, and the clutch gear 33 is connected to the drum 13, so that the operation method is uniaxial.

When the manual operating rod 1 is pushed or pulled, the pin 5 is guided by the straight groove 4a, so that the slide shaft 3 slides into the sleeve 4.

This pin 5 is locked to the inner ring 6, and since the inner ring 6 is housed in the outer ring 7, the outer ring 7 moves together with the slide shaft 3.

When the outer ring 7 moves, the wire 9 is pulled in the direction of movement of the outer ring 7, so the drum 13 rotates in a direction corresponding to this direction of movement.

This rotation of the ram 13 is transmitted to the clutch gear 33 via the clutch pin 38, and the clutch gear 33 rotates within the range of angle θ.

The rotation of the clutch gear 33 is transmitted to the cam cylinder 42, causing it to rotate.

When the cam cylinder 42 rotates, the pins 45, 48 are guided by the straight grooves 17a, 17b and move in the optical axis direction according to the curves of the cam grooves 42b, 42c.

Since these pins 45, 48 are provided on the lens holding frame 45, 47, the variator lens 43 and the compensator lens 46 move in the optical axis direction following the rotation of the cam cylinder 42.

These variator lens 43 and compensator lens 46
The zoom ratio is changed by moving with .

When the manual operating rod 1 is rotated, the sleeve 4 is rotated by engagement between the pin 5 and the linear groove 4a.

When the sleeve 4 rotates, the inner ring 6 also rotates together with it, but the outer ring 7, which rotatably houses the inner ring 6, does not rotate.

When the sleeve 4 rotates, the gear 1 fixed to the tip of the sleeve 4 rotates.
4 rotates, the focusing ring 16 rotates via the conduction system 15.

When the focusing ring 16 rotates, the focusing lens 18 is extended in the optical axis direction to perform focusing.

When the switching operation knob 35 is slid to the right end, the operation method is switched from the uniaxial type to the servo type.

That is, the switching shaft 34 moves together with the switching operation knob 35, and the clutch gear 33 connected thereto slides to the right.

As a result, the clutch gear 33 is disconnected from the drum 13 and can be connected to the driven gear 25 instead.

Further, by sliding the switching operation knob 35, the microswitch 36 is operated, and the power supply circuit of the motor 22 is turned on.

When the clutch gear 33 slides, if the hole 33b and the clutch pin 40 match, the clutch gear 33 is connected to the driven gear 25 simply by sliding the clutch gear 33.

However, in most cases, the two do not match, so operate the operating knob 20 to rotate the motor 22 in both forward and reverse directions, change the position of the driven gear 40, and insert the clutch pin 40 into the hole.
3b.

When the operating knob 20 is turned to change the output potential of the potentiometer 21, the motor 22 rotates following this change.

The rotation of this motor 22 is controlled by an intermediate gear 24 and a driven gear 25.
, is transmitted to the cam cylinder 42 via the clutch gear 33, and the zoom mechanism is activated.

The amount of rotation of the motor 22 is detected by a potentiometer 26 and sent to a servo circuit 27, where it is compared with a target value sent from another potentiometer 21.

The rotation direction of the motor 22 is determined based on the magnitude relationship between the two values, and when the two values match, the rotation of the motor 22 is stopped.

Note that in the servo type, focusing is performed by rotating the focusing ring 16 using a separate servo device.

If the switching operation knob 35 is moved to the right end again, the operation method is switched to the uniaxial method.

At this time of switching, the clutch gear 33 is in a different position from when it is separated from the drum 13, so the manual operating rod 1 is moved back and forth to engage the clutch pin 38 with the hole 33a.

In this case, the drum 3 and the clutch gear 33 are connected only when their phases match.

Therefore, even when the operating method is returned to the uniaxial method, a constant relationship is maintained between the pushing position of the manual operating rod 1 and the zoom ratio.

The present invention having the above configuration is provided with a clutch gear that drives the zoom mechanism, and by moving this clutch gear and connecting it to either the -axis type or servo type drive system, both drive systems can be controlled by the servo type. Since it is selectively connected to the mechanism, it is easy to change the zooming operation method.

Therefore, it is possible to take pictures by freely using the same operation method.

Furthermore, since the two drive systems and the clutch gear are connected only at one location, a constant relationship is always maintained between the push-in position of the manual operating member and the zoom ratio.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the device of the present invention, Fig. 2 is a plan view of the clutch gear seen from the direction of arrow A in Fig. 1, and Fig.
The figure is a plan view seen from the direction of arrow B. 1... Manual operation rod, 3... Slide shaft, 4... Sleeve, 6... Inner ring,
7... Outer ring, 9... Wire, 13
...Drum, 17...Fixed lens barrel, 18
...Focusing lens, 20...
Operation knob, 21...Potentiometer, 22
... Curved motor, 25... Driven gear, 26...
... Potentiometer, 33 ... Clutch gear, 3
5...Switching operation knob, 38...Clutch pin, 40...Clutch pin, 42...
...Cam tube, 43...Variator lens, 46
...Compensator lens.

Claims (3)

[Scope of utility model registration request] (1) In a television camera equipped with a zoom lens, there is a switching operation member that switches the zooming operation between uniaxial and servo type, and a motor that becomes operable when this switching operation member is set to the servo position. , a servo rotating body rotated by the motor, a servo mechanism that controls the rotation of the motor so that the servo rotating body rotates in both forward and reverse directions within an angular range of less than 360 degrees, and zooming and focusing. a manual operating member that can slide and rotate in the axial direction to perform the operation; a single-axis rotating body that rotates within a rotation range of less than 360 degrees in conjunction with the sliding of the manual operating member; and the servo rotating body. and a clutch pin provided on each of the rotating body for the single shaft, and a clutch pin disposed between the rotating body for the servo and the rotating body for the single shaft, sliding in conjunction with the switching operation member, and one clutch pin provided on each side thereof. By fitting either the clutch pin of the single-axis rotating body or the servo rotating body into the hole, a clutch gear is connected to either the single-shaft rotating body or the servo rotating body, and the zoom is driven by this Clara gear. A zooming operation method switching device comprising a zoom mechanism that changes a ratio. (2) The zooming operation method switching device according to claim 1, wherein the -axis angle rotating body is rotated by a wire whose both ends are connected to a manual operation member. (3) The servo mechanism controls the rotation of the motor by comparing the outputs of a first potentiometer that detects the amount of rotation of the motor and a second potentiometer that is operated by an operation knob. The zooming operation method switching device according to claim 1, characterized in that the device comprises a servo circuit.