JP2928894B2 - TV camera lens extender operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera lens extender operating device, and more particularly to a television camera lens extender operating device for inserting or retracting a variable power lens in an optical path of a photographing lens system for a television camera.

[0002]

2. Description of the Related Art Television cameras, especially ENG (electric, news, gathering) cameras, are mainly used for news gathering, sports gathering, sports broadcasting, drama gathering, etc., and can respond to the operability and mobility of photographers. Are needed, and so are the lenses used in such cameras.

As a lens for such an ENG camera,
There is a zoom lens with a built-in extender. In the ENG camera lens incorporating the extender, an extender unit 10 is connected to the rear side of the ENG camera lens 12, as shown in FIG. Although not shown, the mechanism of the extender unit 10 has a structure in which a variable power lens can be inserted into or retracted from an aperture portion of a relay lens portion of a photographing lens system.

The switching between insertion and retraction of the variable power lens is manually performed by a cameraman by a manual switching lever 14 attached to the extender unit 10. As described above, when the ENG camera is used for news gathering, sports gathering, sports broadcasting, drama gathering, and the like, there are cases where only the camera is moved to a high place by a crane device or the like to shoot. However, in such a case, the ENG camera has a drawback that a cameraman cannot quickly switch the zoom lens.

[0005] To solve such a problem, EN
As the G camera, there is an ENG camera shown in FIG. The extender operation device 16 which can be operated by a remote controller is mounted from below the ENG camera lens 12 in a direction indicated by an arrow in the figure, and is manually operated via bolts 18 and 20 as shown in FIG. The switching lever 14 is mounted from outside. The extender operating device 16 switches the variable power lens by remotely operating the manual switching lever 14.

As shown in FIG. 6, the extender operating device 16 has a gear transmission mechanism including a gear train disposed therein. An engagement pin 22 is implanted in the last gear 24 of the gear transmission mechanism.
When the extender operation device 16 is mounted on the lens 12 for the ENG camera, the extender operation device 16 is located in the rotation range of the manual switching lever 14 shown in FIG. Further, the gear 24 is connected to a drive motor 26 remotely controlled by a remote controller via a gear train, and the rotational driving force of the drive motor 26 is transmitted via the gear train. Accordingly, when the gear 24 is rotated by the drive motor 26, the engagement pin 22 is engaged with the manual switching lever 14 and the manual switching lever 14 can be rotated. The lever 14 can be rotated in the opposite direction. Thereby, the variable power lens can be appropriately switched by remote control.

[0007]

However, in the conventional TV camera lens extender operating device, when the extender operating device 16 is mounted on the TV camera lens 12, the manual switching lever 14 interferes with the engaging pin 22. When it is in the position, the engaging pin 22 abuts on the manual switching lever 14 and there is a disadvantage that the extender operating device 16 cannot be mounted. Further, in this state, if the extender operating device 16 is forcibly mounted, the switching lever 14 comes into contact with the engaging pin 22 of the gear 24, and the gear train is damaged.

The present invention has been made in view of such circumstances, and when the switching lever is located at a position where it interferes with an engagement pin of a gear, an extender of a lens for a television camera disabling mounting of an extender operating device is made. It is an object to provide an operation device.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a casing, a motor installed in the casing and controlled remotely, and a motor provided in the optical path of a photographic lens system for a television camera. In a TV camera lens extender operating device having a gear train for transmitting a driving force to a manual switching lever for inserting or retracting a double lens, a lever detection member is provided in a passage of the manual switching lever of the casing. The detection member is fixed to the casing by a lever detection plate supported on the casing so as to be foldable inward and outward directions of the casing,
A stopper for preventing the lever detection plate from folding inward of the casing.

[0010]

According to the present invention, when the extender operating device is to be mounted on the lens for a television camera when the switching lever is located at a position where it interferes with the engagement pin of the gear, the switching lever is moved to the lever detecting plate of the lever detecting member. , And the lever detection plate is prevented from turning inward of the casing, thereby disabling mounting of the extender operating device.
In addition, when the extender operating device is removed, even if the manual switching lever abuts on the lever detecting plate, the lever detecting plate can rotate outward of the casing, so that the extender operating device can be removed without any trouble.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a television camera lens extender operating device according to the present invention. FIG. 1 shows an embodiment of an extender operating device for a TV camera lens according to the present invention, and the same or similar members as those in the conventional example shown in FIGS. I do.

As shown in FIG. 1, the extender operating device 34 is detachably attached to the lower portion of the ENG camera lens 12 by bolts 36. Although not shown in FIG. 1, a gear train similar to that shown in FIG. 6 is arranged inside the extender operating device 28. The description of the engagement relationship between the engagement pin 22 implanted in the gear 24 at the last stage of the gear train and the manual switching lever 14 is omitted here.

As shown in FIG. 1 and FIG.
Reference numeral 8 is provided on the upper surface of the casing 34a of the extender operating device 34, that is, in the pass area of the manual switching lever 14 when the extender operating device 34 is mounted. As shown in FIGS. 1 and 2, the lever detecting section 38 includes a rectangular lever detecting flap 40 having a pair of hinges 42, 42 (FIG. 1).
(Only shown) is provided rotatably on the casing 34a. A stopper 44 is fixed in the casing 34a. Therefore, the lever detection flap 40
The stopper 44 prevents the casing 34a from rotating inward, and can be folded only in the outward direction of the casing 34a.

Next, the operation of the TV camera lens extender operating device constructed as described above will be described. First, when the manual switching lever 14 is at the position shown by the two-dot chain line in FIG. 1, that is, when the extender operating device 34 is mounted, the manual switching lever 14 is moved to the engagement pin 22 shown in FIG.
Will be described.

First, the casing 34a is mounted on the ENG camera lens 12 from below the ENG camera lens 12. At this time, the manual switching lever 14 comes into contact with the lever detection flap 40 before mounting, and the lever detection flap 4
0 is about to be rotated inward of the casing 34a. However, the lever detection flap 40 is
As a result, the casing 34a is prevented from rotating inward, so that the mounting of the extender operating device 34 is prevented. As a result, the manual switching lever 14 is
a, the interference between the manual switching lever 14 and the engagement pin 22 can be prevented, and the gear train can be prevented from being damaged.

When the extender operating device 34 is detached and the manual switching lever 14 is in the passage of the lever detecting section 38, the manual switching lever 14 contacts the lever detecting flap 40. Since the lever detection flap 40 can rotate outward of the casing 34a, the extender operation device 34 can be removed without any trouble.

[0017]

As described above, according to the television camera lens extender operating device of the present invention, when the switching lever is located on the side that interferes with the engagement pin of the gear, the extender device is mounted on the television camera. When the lens is mounted on the lens, the lever detection plate abuts against the stopper member and the rotation in the inward direction of the casing is prevented, and the mounting of the extender device is prevented, so that damage to the gear train or the like can be prevented. .

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a television camera lens to which a television camera lens extender operation device according to the present invention is applied.

FIG. 2 is a perspective view of a main part of a TV camera lens extender operating device according to the present invention.

FIG. 3 is a top view showing an embodiment of a lens for a television camera.

FIG. 4 is an explanatory view showing an embodiment of a conventional extender operating device for a TV camera lens.

FIG. 5 is an explanatory view showing an embodiment of a conventional extender operating device for a TV camera lens.

FIG. 6 is an explanatory view showing an embodiment of a conventional extender operating device for a TV camera lens.

[Explanation of symbols]

 12 Lens for ENG camera 14 Manual switching lever 40 Lever detection flap 42 Hinge 44 Stopper

Claims (1)

(57) [Claims] 1. A driving force is transmitted to a casing, a motor installed in the casing and controlled remotely, and a manual switching lever for inserting or retracting a variable power lens from the motor into an optical path of a photographic lens system for a television camera. In a lens extender operating device for a television camera having a gear train, a lever detecting plate is provided in a passage area of the manual switching lever of the casing, and the lever detecting plate prevents rotation of the casing in an inward direction. An extender operation device for a lens for a television camera, which is capable of rotating outward.