JPS6196879A - Controller of television camera and the like - Google Patents

Abstract

PURPOSE:To obtain a natural picture change by modifying linearly a picture scope at the time of a linear change in panning and tilting. CONSTITUTION:A command signal from a controller 4 causes a universal head 1 to execute tilting, panning and zooming. An arithmetic unit 6 calculates a picture angle Qd from (I) equation for obtaining a screen scope Vd in an arbitrary point td in the midst of moving when a screen scope V1 at a current position is linearly changed to a screen scope V2 at a target position by using the V1, V2 and a moving start point t1 from the current position to target one and a moving termination point t2 to the target position. The linearly changing command signal used for shifting linearly the panning and tilting state from the current position to the target one is transmitted from the controller 4 to a zoom mechanism 2', and a control member for tilting and panning is linearly shifted. Simultaneously the picture angle (rotary angle of zoom ring) control signal obtained according to expression I by the arithmetic unit 6 is transmitted to the zoom mechanism 2' to control the rotary angle of the zoom ring, and a picture scope V caused by the zoom is linearly changed.

Description

[Detailed description of the invention] The present invention relates to an automatic pan head device for a television camera or the like.

Conventionally, automatic camera heads have been known that store camera control modes (focus, zooming, panning, tilting) for each shot on the subject in advance in memory, and then switch to the preset control mode for each shot. ing.

Furthermore, when zooming control of a conventional zoom lens is performed using a servo system, the rotation angle of the zoom ring is configured to change linearly in response to a change in the zoom signal. It is designed to have a linear relationship with changes in the angle of view.

That is, as shown in Fig. 1, if the telephoto angle of view of the zoom lens L is 01 and the wide-angle angle of view is 03, then the midpoint of the telephoto and wide-angle angles of view is θ2=(θ1+03)/2. The rotation angle of the zoom ring at the time of transition from the midpoint angle of view θ2 to the wide-angle angle of view θ3 is the same as the rotation angle of the zoom ring at the time of transition from the midpoint angle of view θ2 to the telephoto angle of view θ1. The change in the command signal for shifting from the point angle of view to the telephoto angle of view and the change in the command signal for shifting from the midpoint angle of view to the wide angle angle of view are also the same amount.

In addition, when changing the panning and tilting states using a servo system, the panning and tilting states change linearly in response to changes in the command signal, so the automatic pan head described above has the following control method for a certain shot. If each command signal changes linearly when transitioning to the control mode in a shot, the movement of the center point of the screen due to panning and tilting will be linear, but the screen range due to zooming will not be linear, so the overall The movement of the screen becomes unnatural.

To explain in detail, the relationship between the screen range V and the angle of view θ associated with zooming is expressed by V = 2 In this case, the screen range V will not change linearly.

Therefore, for example, when moving panning, tilting, and zooming from the wide-angle screen shown in Figure 2(a) to the telephoto screen shown in Figure 82(b) using a servo system, the following steps are required. If the rotating, tilting, and zoom ring rotation angles (angles of view) are changed linearly, the screen range will not change linearly, so the movement trajectory of object ○ within the screen will be as shown in Figure 2 (C). It becomes a natural movement.

The present invention has been made in view of the above-mentioned matters, and the screen range V
It is an object of the present invention to provide a pan head that can change the screen according to the change in the trajectory of the object 0 shown in FIG. 2(d) by linearly changing the angle.

The present invention will be explained below using the drawings.

FIG. 3 is a configuration diagram showing a pan head according to the present invention. In the figure, reference numeral 1 denotes the pan head, which performs tilting, panning, and zooming in response to command signals from a remote controller (not shown). 2 is a zoom lens, and a variable power lens group is accurately moved to a predetermined position by a servo mechanism 2'. 3 is a camera body that is connected to a driving dust of an automatic pan head and also connected to a zoom lens 2.

FIG. 4 shows the main parts of the electrical system installed in a remote controller (not shown) for controlling the servo mechanism 2', where 4 is a controller that issues a zoom position command signal and other command signals, and 6 is a zoom position command signal. This is a calculation device that converts the angle of view from the angle of view to the angle of view that matches panning and tilting.

The arithmetic device 6 has a screen range v1 at the current position, a screen range v1 at the target position, and a time point 1 when the transition from the current position to the target position starts. When changing linearly from vl to v2 from the end point t2 of the transition to the target position, the screen ranges V and d at any time td during the movement are calculated based on the formula % formula % (2) and the angle of view. (zoom rotation angle) and the modified form of equation (1) above that represents the length of the screen range θ = 2 j
an −” M------(3) to the above time td
In this step, the angle of view (zoom rotation angle) ad for setting the screen range to the above Vcl is calculated using a formula.

As configured as described above, a command signal that changes linearly to linearly shift the tilt ink state from the current position to the target position during panning is transmitted from the controller 4 to the zoom mechanism 2', and the command signal is transmitted from the controller 4 to the zoom mechanism 2'. As the tailing control member moves linearly, the angle of view (rotation angle of the zoom ring) control signal obtained from the above equation (4) is transmitted from the calculation device 6 to the zoom mechanism 2', and the rotation angle of the zoom ring is changed. Or, it is controlled based on the signal obtained by equation (4). Therefore, the screen range V due to zooming also changes linearly in the same way as zooming, etc., and the screen change shown in FIG. 2(d) above is obtained.

In the above embodiment, the screen range v1 at the current position, the screen range at the destination position, and the transition time (t2
t+) to find the rotation angle θd of the zoom ring at time td. For example, as shown in FIG. ′, find the rotation angle of the zoom ring at the operation start time t1 and end time t2, and then use the above rotation angle to find the screen range ■l and V2 at that time using the above formula (1), and then calculate the above ( A signal 7' for controlling the rotation angle of the zoom ring at an arbitrary time point td to ad may be generated using equation 4), and the rotation angle of the zoom ring may be controlled using the signal 7'.

Furthermore, instead of controlling the zoom ring described above based on the signal calculated by the arithmetic unit 6, the control described above (
The signal obtained by formula 4) may be preset in a ROM and the zoom ring may be controlled by reading out the signal preset in the ROM during control.

As described above, according to the present invention, the screen range can be changed linearly in the same manner as panning, tilting, etc., so that natural screen changes can be obtained.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram for explaining the relationship between the angle of view of the zoom lens and the screen range, Figures 2 (a) to (d) are explanatory diagrams for explaining the state of screen change, and Figure 3 is FIG. 4 is a block diagram showing an electric circuit in the control device according to the present invention, and FIG. 5 is an explanatory diagram for explaining the present invention in detail. 1--One camera head 2--Zoom lens 2'-11 servo mechanism 4-m-Controller 6--Arithmetic unit No. 1 Figure 2 (a) (ra)
(Cn (dn Figure 3 z 3

Claims (1)

[Claims] In a control device such as a television camera that simultaneously controls at least two types of controlled objects of a camera such as panning, tilting, and zooming, including zooming, the rotation angle of a zoom ring in zooming control is driven non-linearly. A control device for a television camera or the like, characterized in that the control device linearly drives at least one of the control objects and at least one other control object.