JPH04250780A - Video camera equipment - Google Patents

Abstract

PURPOSE:To simplify the adjustment of dispersion in the characteristic of a Hall element detecting the opening/closing of an iris. CONSTITUTION:A date time generator 9 generates date time information and gives it to a terminal 10A of a switch means 10. An output of a Hall element 13 via a Hall amplifier 14 and digitized by an A/D converter 15 is given to a terminal 10B of the switch means 10. An output of the switch means 10 is fed to a character generator 7, its output is displayed superimposingly onto a display device 6. The switch means 10 is thrown to the position of the terminal 10A in the normal mode and the date time information is superimposingly displayed on the display device 6. In the adjustment mode, the switch means 10 is thrown to the position of the terminal 10B and an output of the Hall element 13 via the Hall amplifier 14 is superimposingly displayed on the display device 6. Since the output of the Hall element 13 via the Hall amplifier 14 is superimposingly displayed on the display device 6 in the adjustment mode, the dispersion in the characteristic of the Hall element is adjusted simply while observing the display.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera device, and more particularly to the opening/closing adjustment of an iris of a video camera device.

0002

2. Description of the Related Art A Hall element is used to detect whether the iris of a video camera is open or closed. In this way, when detecting the open/closed state of the iris using a Hall element, since the Hall elements have variations in characteristics, it is necessary to make adjustments in advance to compensate for variations in the characteristics of the individual Hall elements.

FIG. 2 shows an example of a method for measuring individual variations in Hall elements. In FIG. 2, an iris drive signal is output from a system controller 50 via a driver 51. This iris drive signal is supplied to the iris motor 52. This controls the opening and closing of the iris 53. The open/closed state of the iris 53 is detected by the Hall element 54. The output of the Hall element 54 is supplied to the system controller 50 via the Hall amplifier 55 and the A/D converter 56 .

The gain of the Hall amplifier 55 can be controlled in accordance with variations in the Hall element 54 by a control signal given from the controller 50 via the D/A converter 57.

During adjustment, a measuring device 58 is connected to the output terminal of the Hall amplifier 55. As the measuring instrument 58, an oscilloscope or a voltmeter is used. The iris 53 is controlled to open and close to a predetermined opening degree by a drive signal from the system controller 50. The output of the Hall amplifier 55 at this time is detected by the measuring device 58. System controller 5
By changing the control signal given through the D/A converter 57 from 0 to 0, the gain of the Hall amplifier 55 is changed. When the gain of the Hall amplifier 55 is changed,
The output of the Hall amplifier changes accordingly. While viewing the measurement display of the measuring device 58, the gain of the Hall amplifier 55 is controlled so that the output of the Hall amplifier 55 becomes a predetermined value.

[0006]

SUMMARY OF THE INVENTION In such a conventional adjustment method, there is a problem in that the output of the Hall amplifier 55 must be led out to the outside, and the adjustment is time-consuming. Additionally, a measuring device 58 for measuring the output of the Hall amplifier 55 is required.

Therefore, an object of the present invention is to provide a video camera that is easy to adjust and can adjust for variations in the characteristics of a Hall element that detects the opening of an iris, for example, without using a special measuring device. be.

[0008]

[Means for Solving the Problems] The present invention provides date and time information generation means for generating date and time information, adjusted measurement information generation means for generating adjusted measurement information, and generation of date and time information and adjusted measurement information from the date and time information generation means. A switching means for switching the adjusted measurement information from the switching means, a display generating means for generating a display signal based on the date and time information or the adjusted measurement information output from the switching means, and a display for projecting the display signal from the display generating means. The video camera apparatus is characterized in that the switching means is switched between a normal mode and an adjustment mode.

[0009]

[Operation] The switch means 10 is switched between the normal mode and the adjustment mode. In the normal mode, the switch means 10 is switched to the terminal 10A side, and the date and time are superimposed on the display 6. In adjustment mode switch means 1
0 is switched to the terminal 10B side, and the output value of the Hall amplifier 14 is displayed on the display 6. Therefore, it is possible to adjust variations in the Hall elements 13 and the like without using a measuring instrument.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the invention.

In FIG. 1, a subject image is formed on the light receiving surface of a CCD image sensor 3 via a lens 1 and an iris 2. The output of the CCD image sensor 3 is supplied to a video signal processing circuit 4. A video signal processing circuit 4 generates, for example, an NTSC video signal from the imaging signal. This video signal is supplied to a display 6 via an adder circuit 5 that displays a character signal.

A character signal is supplied to the addition circuit 5 from a character generation circuit 7. This character signal is generated based on data from the system controller 8. As will be explained later, in the normal mode, date and time data is provided from the system controller 8 to the character generation circuit 7. In the adjustment mode, the output data of the Hall amplifier 14 is given from the system controller 8 to the character generation circuit 7. The display 6 has a CCD
The image pickup screen of the image sensor 3 is displayed, and at the same time, the characters from the character generation circuit 7 are displayed superimposed on this display screen.

The system controller 8 is equipped with a date and time generator 9 . The output of this date and time generator 9 is supplied to a terminal 10A of a switch means 10.

An iris drive signal is also output from the system controller 8 via the drive circuit 11, and this iris drive signal is supplied to the iris motor 12. This controls the opening and closing of the iris 2. The open/closed state of the iris 2 is detected by the Hall element 13. Hall element 1
3 is supplied to the A/D converter 15 via the Hall amplifier 14. The output of this A/D converter 15 is supplied to the terminal 10B of the switch means 10. The gain of the Hall amplifier 14 can be controlled by the output of the D/A converter 16.

In the normal mode, the switch means 10 is switched to the terminal 10A side. Therefore, the output of the date and time generator 9 is supplied to the character generation circuit 7. and,
The image capture screen of the CCD image sensor 3 is displayed on the display 6, and the date and time are superimposed on the display.

In the adjustment mode, the switch means 10 is switched to the terminal 10B side. Therefore, the character generation circuit 7 is supplied with the output of the A/D converter 15. A
The output data of the Hall amplifier 14 is supplied to the /D converter 15. Therefore, in the adjustment mode, the output value of the Hall amplifier 14 is displayed in a superimposed manner on the display 6.

As described above, in one embodiment of the present invention, the output value of the Hall amplifier 14 can be displayed on the display 6 in the adjustment mode. Therefore, a measuring device is not required when adjusting the dispersion of the Hall element 13. That is, during adjustment, the switch means 10 is switched to the terminal 10B side. Therefore, the output value of the Hall amplifier 14 is displayed on the display 6. The iris 2 is controlled to open and close to a predetermined opening degree by a drive signal from the system controller 8. The output of the Hall amplifier 14 at this time is displayed on the display 6. By changing the control signal given from the system controller 8 via the D/A converter 16, the gain of the Hall amplifier 14 is changed. When the gain of the Hall amplifier 14 is changed, the output of the Hall amplifier 14 changes accordingly. While viewing the output value display of the Hall amplifier 14 superimposed on the display 6, the gain of the Hall amplifier 14 is controlled so that the output of the Hall amplifier 14 becomes a predetermined value.

[0018]

According to the present invention, the output value of the Hall amplifier 14 is displayed on the display 6 in the adjustment mode. Therefore, it is possible to adjust variations in the Hall elements 13 and the like without using a measuring instrument. Then, since the adjustment data is displayed using the date and time display part,
There is no need to add special hardware, and it can be made smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a block diagram used to explain a conventional example.

[Explanation of symbols]

2 Iris 6 Display 7 Character generator 8 System controller 9 Date and time generator 10 Switch means

Claims (1)

[Claims] 1. Date and time information generation means for generating date and time information, adjusted measurement information generation means for generating adjusted measurement information, date and time information from the date and time information generation means and adjusted measurement information from the adjusted measurement information generation means. a display generating means for generating a display signal based on the date and time information or adjusted measurement information output from the switching means, and a display for projecting the display signal from the display generating means; A video camera device characterized in that the switching means is switched between a normal mode and an adjustment mode.