JP3099400B2 - TV camera shooting mode switching 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 photographing mode switching device for a television camera for photographing by switching between a normal photographing mode and a macro photographing mode in a lens device of a television camera.

[0002]

2. Description of the Related Art In a lens device of a television camera, a macro photographing mechanism in which a macro photographing lens is attached to a turret is provided for photographing a subject at a short distance, that is, a macro photographing. Sometimes,
A configuration in which the turret is rotated so that the macro photography lens faces the optical axis has been proposed by the present applicant as Japanese Patent Application No. 2-129209. When the lens device is formed in this manner, it is very convenient because the normal shooting and the macro shooting can be switched and operated by operating the turret. Here, focusing at the time of macro photography is performed using a zoom lens, not a focus lens.

At the time of macro photography, the focus characteristics of the zoom lens differ depending on the position of the focus lens as shown in FIG. That is, when the focus lens is located on the infinity side, the focus characteristic is as shown by the dashed line in FIG. 3, and when the focus lens is located on the closest side, it is shown by the solid line in FIG. It shows such characteristics. Here, the macro shooting by the television camera is usually used to shoot the subject within a range of about 0.3 m to 2.5 m.
At a distance exceeding 2.5 m, photographing is generally performed in a normal photographing mode, so that focus controllability within this range must be good.
As is clear from the drawing, when the focus lens is located at the closest end, it is most convenient to perform focusing at 2.5 m to 0.3 m. Therefore, when performing macro photography, the photographer operates the focus lens as appropriate to move it to the close side.

[0004]

By the way, at the time of normal photographing, the focusing is performed by the focus lens, so that when switching to the macro photographing, the focus lens is not always located on the close side. Absent. In this state, when a switching operation of the turret or the like is performed to perform macro shooting, it is necessary to separately perform an operation of moving the focus lens at the same time. There is a disadvantage that the macro shooting may be performed without performing the position adjustment. Also, for example, when shooting a baseball or other sports program,
When shooting from the ground, take a macro shot of the TV camera to an announcer or commentator located at a close distance, then return the TV camera angle to the original ground and perform normal shooting From the position where the focus lens is in focus during normal shooting, the focus lens must be moved to perform macro shooting once, and when returning to normal shooting, the focus lens must be focused again. There is also a problem that the operation of the focus lens becomes extremely complicated.

The present invention has been made to solve the above-mentioned drawbacks and problems of the prior art, and an object thereof is to switch between a normal photographing mode and a macro photographing mode. By following and displacing the focus lens, there is no need for complicated operation,
It is an object of the present invention to provide a photographing mode switching device for a television camera that can shift a focus lens to an appropriate position.

[0006]

In order to achieve the above-mentioned object, the present invention provides a normal photographing mode for photographing without using a macro photographing lens and a macro photographing mode for photographing via a macro photographing lens. a photographing mode selecting means for switching between a focus lens operating means for operating the focus lens at the time of photographing in the normal shooting mode to detect the position of the focus lens displaced by the operation of the focus operating means, said photographing Mode selection
The shooting mode is changed from the normal shooting mode to macro by means
Even when switching to shooting mode, this focus lens
Focus lens position detection means for holding the state of detecting the position of the camera, and when the macro shooting mode is selected
Is a position detected by the focus lens position detecting means.
While allowed to hold, Bei the closest end position output section for outputting a driving signal for displacing the focusing lens to the closest end position
When the macro shooting mode is selected by the shooting mode selecting means, the focus lens is shifted to the closest side end position based on the signal from the close end position output unit, and the mode is changed from the macro shooting mode to the normal shooting mode. When the focus lens is switched, the focus lens position detecting means is controlled based on an output signal from the focus lens operating means.
The feature is that the focus lens is returned to the detection position .

[0007]

When the mode is switched to the macro shooting mode by operating the shooting mode selection means while shooting in the normal shooting mode, the focus lens is turned on based on the output signal from the close end position output section. Displaces reliably to the nearest end position. This facilitates focusing in the macro photography mode performed by operating the zoom lens. In addition, when switching from the macro shooting mode to the normal shooting mode, full
Based on the output signal from the focus lens position detection means
The focus lens when shooting in normal shooting mode.
Position of the focus lens that was displaced by the operation of
In other words, the focus lens returns to the position immediately before the macro shooting mode is selected.

By performing such an operation,
In the case where the subject at the closest position and the subject at a position separated by a predetermined distance are alternately photographed, it becomes possible to relieve the extremely troublesome operation of adjusting the position of the focus lens accompanying the switching of the photographing mode, Operability of the lens device of the television camera can be significantly improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 denotes a focus lens drive motor, 2 denotes a macro lens drive motor, and the focus lens drive motor 1 is a known device that moves the focus lens 3 along the optical axis X of the lens device 4 to the nearest side. It is a driving means for moving from the position to the end position at infinity. The macro lens driving motor 2 rotates, for example, the turret 5 so that the macro photography lens 6 mounted on the turret 5 faces the optical axis X, or retracts the macro photography lens from the optical axis X. For rotating the turret 5 for rotation.

The focus lens drive motor 1 operates based on a focus control signal input via an amplifier with a comparator 8 from a focus lens operation means 7 having a potentiometer or the like displaced by operation of an operation means (not shown). It is. Further, a signal from the focus lens position detecting means 9 is input to the amplifier 8 so that the focus lens position
The signal of the stage 9 and the signal from the focus lens operating means 7 are compared, and the focus lens 3 is moved along the optical axis X in accordance with the difference, whereby focusing is performed.

Reference numeral 10 denotes a switch as a photographing mode selecting means. When the switch 10 is in an open state, the macro photographing lens 6 mounted on the turret 5 is at a position retracted from the optical axis X. Shooting can be performed. When the switch 10 is closed, the signal is applied to the macro lens driving motor 2 via the amplifier 13 to displace the macro photographing lens 6 of the turret 5 toward the optical axis X, so that the macro photographing is performed. Becomes possible. That is, when the switch 10 is turned on and off, the lens device 4 is switched between the normal photographing mode and the macro photographing mode.

Reference numeral 11 denotes a switch as focus lens displacing means for forcibly displacing the focus lens 3 when the switch 10 switches between the normal photographing mode and the macro photographing mode. The switch 11 operates the focus lens driving motor 1 in conjunction with the contact b on the focus lens operating means 7 side and the close end position output section 12 in conjunction with the ON / OFF operation of the switch 10.
This is for switching between the contact a on the side. The near-end position output unit 12 outputs a voltage (+
NV). When the switch 10 is in the open state and the normal shooting mode is selected,
The switch 11 becomes the contact b side, the switch 10 is closed,
When the mode is switched to the macro shooting mode, the switch 11 is configured to switch to the contact a side following the mode.

This embodiment is constructed as described above, and its operation will now be described. Thus, in the present embodiment, for example, in a sports game such as baseball, an operation of alternately photographing a ground or field, which is a distant subject, and a subject at a close distance, such as a commentator or announcer, is performed. Will be described as an example.

First, in order to shoot a play on the ground, the lens apparatus is set to a normal shooting mode and shooting is performed. In this case, the switch 10 is kept OFF. Thus, when the focus lens 3 operates the focus lens operating means 7, the difference between the focus lens operating means 7 and the focus position detecting means 9 is calculated by the amplifier 8 with the comparator, and based on the output signal, the focus lens 3 is operated. 3 moves to perform focusing.

In this state, the photographing mode is switched to the macro photographing mode in order to photograph the commentator, announcer and other subjects at a close distance. To do this, set switch 10 to O
N. As a result, the turret 5 rotates and the macro shooting lens 6 faces the optical axis, and macro shooting for shooting an object at a close distance becomes possible. At the same time, the switch 11 switches from the contact b to the contact a . As a result, the focus lens driving motor 1 is connected to the close end position output unit 12, and the motor 1 is driven by an output signal from the close end position output unit 12.
Is driven to forcibly displace the focus lens 1 to the closest position. Therefore, when performing macro photography, the focus lens 3 is arranged at a position most suitable for performing focusing by a zoom lens (not shown). When this macro photographing mode is selected, the focus lens 3 is displaced to the closest end position, but this signal is transmitted to the focus lens operating means 7.
Since this is due to the close end position output unit 12, which is separate from
The focus lens operating means 7 is held in a state where the position at this time is displayed.

In order to switch the position of the lens device 4 from the above-described close-up shooting state to the original ground shooting state, the switch 10 is operated to switch the shooting mode from the macro shooting mode to the normal shooting mode. Be replaced.
As a result, the contact point of the switch 11 is switched from the a side to the b side, and the focus lens 3 is automatically displaced to a position immediately before switching to the macro shooting mode by a signal from the focus lens operating means 7. . As a result, even if the special focus lens 3 is not operated, the state automatically returns to the state where the ground is focused.

[0017]

As described above, the present invention is suitable for switching between the normal shooting mode and the macro shooting mode.
When the macro shooting mode is selected, the
The focus lens based on the output signal from
To normal shooting mode from macro shooting mode
When the focus lens is switched to
Is Ru is returned to the position of the focus lens immediately before the selected macro shooting mode based on a signal from the lens operating unit
Since the configuration, the focus lens without special operation
Change from normal shooting mode to macro shooting mode,
Macro mode to normal shooting mode
The subject is immediately brought into focus, and the operability of the television camera is significantly improved as a whole.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a photographing mode switching device according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram of a zoom lens depending on a position of a focus lens.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Focus lens drive motor 2 Macro lens drive motor 3 Focus lens 4 Lens device 5 Turret 6 Macro shooting lens 7 Focus lens operation means 9 Focus lens position detection means 10 Switch 11 Switching means 12 Closest end position output part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-125513 (JP, A) JP-A-3-119872 (JP, A) JP-A-60-10215 (JP, A) JP-A-1- 267606 (JP, A) Hira 4-42616 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G02B ^7/ 04-7/16

Claims (1)

(57) [Claims] 1. A lens apparatus for a television camera having a zoom lens, a focus lens, and a macro photography lens, wherein a normal photography mode for performing photography without passing through a macro photography lens and a macro for performing photography via a macro photography lens. a photographing mode selecting means for switching between a photographing mode, detects a focusing lens operating means for operating the focus lens at the time of photographing in the normal shooting mode, the position of the focus lens displaced by the operation of the focus operating means The photographing mode selecting means
Macro mode from the normal shooting mode
When the camera is switched to
Focus lens position detection means for holding the position of the cas lens and detecting the focus when the macro photography mode is selected.
While holding the detection position by the lens position detection means
A close-end position output unit for outputting a drive signal for displacing the focus lens to the close-end position , wherein when the macro-photographing mode is selected by the photographing mode selecting means, the close-end position output unit When the focus lens is shifted to the close end position on the basis of the signal from the camera, and the mode is switched from the macro shooting mode to the normal shooting mode, the focus lens position detecting means based on the output signal from the focus lens operating means .
A photographing mode switching device for a television camera , wherein the focus lens is returned to a detection position .