JPS60100885A - Adjusting device of color television camera - Google Patents

Abstract

PURPOSE:To make it possible to coarsely and finely adjust with one rotary encoder by changing the pulse number integration obtained from a rotary encoder in accordance with the angular velocity. CONSTITUTION:After the control items are selected with switches 4-1-4-n, the rotation information and the rotation direction information of a rotary encoder RE1 from a pulse integration and rotation decision circuit 2 to CPU3. Next, CPU3 counts the control value for the selected control item and sends the value through D/A converter groups 5 and 7. The pulse number integraion used to count the control value is changed in accordance with RE1 rotation angular velocity. For this reason, since the control value for RE1 rotation angle changes with the angular velocity of RE1 rotation shaft as a parameter, the finely adjusting operation is obtained when it is slowly rotated, and the coarsely adjusting operation is obtained when it is speedily rotated. In this way, the coarse and fine adjustment can be executed with one RE.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a color television camera in which a control input for controlling a controlled circuit is obtained by a regulator that outputs a pulse number proportional to the rotation angle. This invention relates to improvements in adjustment devices for television cameras.

[Technical background of the invention and its problems]

In recent years, it has become common for color television cameras to be equipped with an automatic adjustment function using a microcomputer.
However, not all adjustments are carried out as they are automatically adjusted, and manual adjustments are made for items other than automatic adjustment items.These are manual adjustments, although the degree of adjustment is low. This is an adjustment that is done in any case to obtain the best situation than automatic adjustment. A rotary encoder (hereinafter referred to as 几, E) is used as a manual control input means for this purpose.Since 0 几, E is already supplied to the market as a product, the details will be omitted, but the rotation axis of 几, E Generally, a pulse train is output with a frequency proportional to the angular velocity of the motor, and the pulse train has two phases in order to determine the direction of rotation. Then, using one of the phases of these two pulses as a reference, it can be determined that if the other one is ahead in phase by 90', it is turned clockwise, and if it is delayed by 90 degrees, it is turned counterclockwise.

In this adjustment by E, the pulse train is integrated by 1=S, the rotation angle information and the rotation direction information are detected, and the corresponding side items are controlled based on this information. This control is generally performed faster if the rotating shaft of E is rotated faster, and slower if the rotating shaft of E is rotated slowly, and is proportional to the angular velocity of the rotating shaft.

In such an adjustment, the CPU reads the integration results of the output pulse trains of IL and E at regular intervals, so the amount of change in the control amount for one pulse output of It and E is always constant. (In other words, the change in the rotation angle of the rotation axis is constant.) Therefore, in the case of 1° horizontal centering of nine,
The resolution is 1/1024, or approximately 1/1000, when the number of bits in one f-intal word of the CPU is taken as IO bits.
resolution. If this is assumed to cover the entire E22 rotation range, the electronic step will be 20/1000=0.02 inches when the horizontal centering variable range is ±20 inches. In the current broadcasting system, the detection limit based on the visual angle of horizontal centering is less than 0.05%, so considering the non-linearity (usually ±1/2 to 1 bit) of the I)/A transformer, it becomes unambiguous. It can be considered that SDEGG is slightly beyond the detection limit. As mentioned above, covering the entire range in 2 rotations means changing 1000 steps in 2 rotations, so 5001 becomes a child step in 1 rotation, and 1 child step is 360°1500 = 0. It is obtained by rotating 72°. In other words, the detection limit for the rotation angles of R and B becomes critical. In order to avoid this, you can increase the rotation speed of Le and E for the entire variable range, but next time, when you want to cover the entire variable range or have a large amount of change, you have to manually turn Le and E many times. It was rather inconvenient.

[:I@Ming's purpose]

The present invention is intended to eliminate the above-mentioned drawbacks, and when lL and E are rotated at different angular velocities IW, the pulse integration result corresponding to the rotation angle changes by 1a due to the change in angular velocity. Therefore, when the rotation shaft is turned slowly, the change in control 1 with respect to the rotation angle becomes small, and when it is turned quickly, the change in control 1 becomes large, and even if the rotation angle is the same as described in 11 above, It is an object of the present invention to provide a gviiu of a color television camera that can obtain a change in oJ' IRarc range.

[Invention training]

In the present invention, in an adjustment device for a color television camera that performs rAMm'J by accumulating the number of pulses proportional to the rotation angle from l(,,E), the pulse number accumulation is changed according to the warping angle speed. It is.

[Embodiments of the invention]

Hereinafter, one aspect of an embodiment of the present invention will be explained with reference to FIG. 03 is activated and this pulse train signal is supplied to the circuit (2) consisting of a microprocessor (S).
The CPU (hereinafter referred to as CPU) reads data from the upper circuit (2) and calculates the tfflJi111 value. 4-1.4-2. ... 4-n is a switch for selecting the control item, and in response to the input of these σ) switches, data corresponding to the collateral item is generated from the function selection matrix (4), and the control of the secondary item in 7 is generated. (to) is possible.

thT by switch (4-1, 4-2, -4-n)
After the ll la1 item is selected, the rotation angle information and rotation direction information of the knob calculation and rotation determination circuit (2) are supplied to the CPU (3).
In 3), these pieces of information are read at a constant cycle (1) whose color is set based on a clock pulse or the like.

If it is integrated during this period and the number of 90s is n, then the CPU
At t31, if E(1) is rotated axial force five times at a constant angular velocity, n(Russ number reading force I↑) will be applied every T.

It's Sumire, such CI' U (reading to 33 is I
t, Ejl) σ Month 51 foot rotation angle may be made to (Top 1) This unit rotation angle tlj.This pulse a
(n) After Jrut inclusion has been made, C)'Ut3)
Then, the following calculations are performed.

m = n (n / N)' - 11) I) = A
-L-f o+ d, t... (2) This (
1) In formula (2)? where N is a constant and C is a constant (cal)
, 8 is the previous accumulated first shift, and 1) is the successor f shift.

Therefore, 11ξ of n = N is In
2 rl, and n (when N, (n / N) 0<
Since it becomes 1, n+ (n becomes sai, n) When N, 1 tn > n due to (n/N)c〉l.

That is, the rotation of l(,,Jl) is N
When the rotation is slow and outputs fewer pulses than the CPU At the time of fast rotation that outputs more than N pulses, it becomes m)n, and by adding A, the control value D+
is obtained. In other words, the integrated value of the number of pulses (n) changes according to the rotational angular velocity of the rotating shaft (% R, Etl), and it is the same as reducing the number of output pulses by rotating the rotating shaft slowly, and rotating it faster. This is equivalent to increasing the number of output pulses. na&, m is the circuit (2)
A is added to or subtracted from A based on the rotational direction information of a and g(i) determined by. The value calculated by CPU +31 is calculated by digital-analog converter group +5J (
7) Conversion units (5-1, 5-2, . . . 5-n, ?-) corresponding to the control items (hereinafter referred to as D/A converter group)
1, 7-2, . . . 7-n) to the controlled circuit for control. This one D/A converter group (5)
is provided in a remote camera head, etc., and transmission of ff1lJ idl iii D to this is performed via a multiplexing circuit +8), a cable (9), and a multiple power demodulation circuit UI.

It! of this controlled circuit! As mentioned above, the control is done by changing the rotational angular velocity of the rotating shaft of R, l) using N as the boundary, resulting in fine adjustment at slow rotations and coarse adjustment at large rotations of n,>N. . Fine adjustment and coarse adjustment using Effll are performed using c as a parameter and n=N as shown in Figure 2.
It changes with the border. Such IL, E(1)
By means of (2), the market + J I wholesale circuit can be controlled as shown in Figure 3.

That is, in the figure, the solid line I indicates the conventional control, but by rotating the dotted line U, the lever is rotated twice and 1l.
jll IMI can be done. Conversely, if it is rotated at an angular velocity of n (N), it will be 21L as shown by the broken line (■)!The entire range can be controlled with one rotation or more, and one high-precision city IJ cape can be made. By changing the angular velocity of Ef1) midway, it is possible to change its control state. In addition, in this FIG. 3, the initial values, that is, A in equation (2) are all shown as zero.

[The birth of invention]

As described above, according to the present invention, in the adjustment device for a color television camera that obtains the control values for operating the controlled circuit at a and g, the control values for the rotation angles of 几 and E are the rotation angles of R2E. Since it changes using the angular velocity of the shaft as a parameter, slowly turning RlE becomes a fine movement. Can be used for both fine adjustment and
Moreover, a control circuit can be obtained in which the switching is performed based on the natural reaction of the operator, such as turning slowly when making fine adjustments and turning quickly when making coarse adjustments.

Also, for the Ifllll- item, N, C in the above equation (1)
It is also possible to store these values in a memory circuit, etc. so as to change them, and read out these values to control the control items according to the selection of the switch.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of an adjustment device for a color television camera according to the present invention, and FIGS. 2 and 3 are operation explanatory diagrams showing the operation of FIG. 1, respectively. 1. Rotary encoder, 2. Pulse integration, rotation discrimination circuit, 3. Arithmetic circuit, 5.7... Digital.
Analog converter group. Agent: Patent attorney Noriyuki Chika (and 1 other person) Leaf 2 Flashing Falcon A

Claims (3)

[Claims] (1) In a color television camera adjustment device that uses a rotary encoder that generates a pulse signal proportional to the rotation angle and performs adjustment by integrating the number of output pulses, the integrated number of pulses by the rotary encoder is adjusted according to its angular velocity. and means for generating a peak value according to the cumulative number of pulses produced by the means, the variation of the peak value depending on the angular velocity of the adjuster. Device. (2) The adjustment device for a color television camera according to claim 1, characterized in that the number of pulses is integrated at predetermined intervals. (3) The adjustment device for a color television camera according to claim 1, wherein the pulse number is integrated at every predetermined rotation angle of the rotary encoder.