JP5327436B2 - TV camera photography device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination device 11 capable of reducing power consumption by suppressing increase of heat generation of an LED 14, even when a light quantity is increased. <P>SOLUTION: A lighting device 22 PWM controls the LED 14 so as to light it for the exposure time of a television camera 32 PWM controlling the LED 14 and the LED 14 so as to turn it off for the non-exposure time of the television camera 32, by using a synchronizing signal used for taking a photograph by the television camera 32 in synchronization with the exposure time. Even when the lighting of the LED 14 concentrates on the exposure time of the television camera 32, to increase the light quantity, the LED 14 is turned off for the non-exposure time of the television camera 32, so that the increase of the heat generation of the LED 14 is suppressed to reduce the power consumption. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to an imaging device for a television camera.

  In a television studio or a stage where photographing is performed using a television camera, an illumination device that illuminates a subject is used. In general, a halogen light bulb or a discharge lamp is used as a light source in the illumination device, but an illumination device has been developed.

  In an illumination device using an LED, the brightness is adjusted by controlling the lighting of the LED by PWM control. However, when a subject illuminated by the PWM controlled LED is photographed by a television camera, depending on the frequency band of the PWM control, In some cases, the timing of shooting with the TV camera may not match the timing of turning on / off the LED, and flicker may occur in the video of the TV camera.

Therefore, the LEDs are PWM-controlled at a frequency that is an integer multiple higher than the synchronization frequency of the TV camera so that the brightness of the odd field and the even field of the video captured by the TV camera are substantially the same (for example, Patent Document 1). reference.).
Japanese Patent Laying-Open No. 2006-79990 (page 4-5, FIG. 1-3)

  However, the illumination device using the conventional LED has a problem that the amount of light is small compared to the case where the lamp is used. When the amount of light is increased, the amount of heat generated by the LED increases, and the heat dissipation performance is high. There is a problem that an appliance structure is required and power consumption increases.

The present invention has been made in view of the above points, and an object of the present invention is to provide a television camera photographing apparatus that can suppress an increase in the amount of heat generated by an LED and reduce power consumption even when the amount of light is increased. .

2. The television camera photographing apparatus according to claim 1, wherein a plurality of television cameras for photographing a subject; a synchronization signal generating source for generating a periodic synchronization signal for synchronizing an exposure time between the television cameras; and is configured separately plurality provided for illuminating the subject, and, respectively instrument body using an LED as a photographing light source of the television camera, and the synchronization signal processing unit for inputting the sync signal from the outside, synchronized a plurality of illumination devices and a lighting device for PWM controlling the LED to light exposed out of time dimming or off in synchronization with the synchronization signal input to the signal processing unit to the exposure time based-out Te Rebikamera Is provided.

  The illumination device is used to illuminate a subject in a television studio or a stage where a television camera is used for photographing.

  The TV camera receives a synchronization signal from an external synchronization signal generation source, captures an image at an exposure time when the shutter is opened at a predetermined synchronization frequency based on the synchronization signal, and outputs an image.

  The LED includes a so-called power type LED and a bullet type, and a predetermined amount of light is secured by using a plurality of LEDs.

  The instrument body includes an LED, a lens that collects and emits light from the LED, a radiator that dissipates heat from the LED, a power supply unit, a synchronization signal processing unit, a control unit, and the like.

  The synchronization signal processing unit acquires a synchronization signal from an external synchronization signal generation source by a wired, wireless, or power line transmission method.

  The lighting device performs PWM control on the LED so that the LED is lit in synchronization with the exposure time of the television camera based on the synchronization signal input to the synchronization signal processing unit. For example, the switching element is PWM-controlled at a predetermined frequency, the lighting power source supplied to the LED is controlled to control the LED lighting time, and the light output of the LED is controlled. At this time, PWM control can be performed so that the LED is turned on during the exposure time of the TV camera, and PWM control can be performed so that the LED is dimmed or turned off outside the exposure time of the TV camera. .

Exposure time outside Te Rebikamera is between exposure time during which the shutter is opened, the time zone in which the shutter is closed, a time period which is not captured.

According to the television camera photographing apparatus of the first aspect, the television camera uses the synchronization signal used for photographing by synchronizing the exposure time, and the LED is turned on during the exposure time of the television camera. Even if the amount of light is increased by concentrating the lighting of the LEDs on the exposure time of the TV camera in order to increase the light amount, the TV camera Since the LED can be dimmed or extinguished outside the exposure time, an increase in the amount of heat generated by the LED can be suppressed, and power consumption can also be reduced .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of the illumination device, FIG. 2 is a cross-sectional view of the illumination device, and FIG. 3 is a waveform diagram showing the relationship among the synchronization signal of the illumination device, the synchronization frequency of the camera, and PWM control.

  As shown in FIG. 2, the illuminating device 11 has a fixture body 12, and the fixture body 12 is provided with a mounting portion 13 that is attached in a suspended state to a baton placed on the ceiling of a television studio or the like. ing.

  A substrate 15 having a plurality of LEDs 14 mounted on one surface facing the front of the instrument body 12 is disposed near the center of the instrument body 12. The other surface of the substrate 15 is attached to a radiator 16 that dissipates heat transferred from the LED 14 to the substrate 15.

  On the front side of the instrument body 12, optical means 17 such as a cutter or a filter that makes the light of the LED 14 a predetermined shape, and a plurality of lenses 18 that collect the light of the LED 14 and irradiate the light to the outside are arranged. . The lens 18 is moved in the optical axis direction by a handle 19 so that focus adjustment is possible.

  On the rear side of the instrument body 12, a power supply line is connected from the outside to supply a predetermined power to the lighting device 11, a synchronization signal processing unit 21 for inputting a synchronization signal from the outside, and an LED 14 to control lighting. A lighting device 22 is arranged.

  Next, as shown in FIG. 1, in a television studio or the like, a synchronization signal source 31, multiple (only one is shown in FIG. 1) television cameras 32, and multiple (only one is shown in FIG. 1) illumination. A device 11 is arranged.

  The synchronization signal generation source 31 outputs a synchronization signal to control the plurality of television cameras 32 and the plurality of lighting devices 11.

  Each television camera 32 captures an image during an exposure time when the shutter is opened at a predetermined synchronization frequency based on the synchronization signal input from the synchronization signal generation source 31, and outputs an image.

  Transmission of the synchronization signal between the synchronization signal generation source 31, the TV camera 32, and the illumination device 11 may be performed using any of wired, wireless, and power line transmission systems.

  In the lighting device 11, the synchronization signal processing unit 21 receives the synchronization signal transmitted from the synchronization signal generation source 31, and outputs the synchronization signal from the synchronization signal processing unit 21 to the lighting device 22.

  The lighting device 22 includes a switching element, and controls the lighting power source supplied to the LED 14 by controlling the switching element with PWM at a predetermined frequency, thereby controlling the lighting time of the LED 14 and the light output of the LED 14. .

  Further, as shown in FIG. 3, the lighting device 22 performs PWM control on the LED 14 so that the LED 14 is lit in synchronization with the exposure time of the television camera 32 based on the synchronization signal input from the synchronization signal processing unit 21. The LED 14 is PWM controlled so that the LED 14 is turned off in synchronization with the exposure time outside the TV camera 32.

  In this way, the TV camera 32 uses the synchronization signal used to shoot with the exposure time synchronized, and the exposure time of the TV camera 32 is controlled by PWM so that the LED 14 is lit, so that the TV The amount of light necessary for shooting by the camera 32 can be obtained.

  Moreover, in order to increase the amount of light, even if the lighting of the LED 14 is concentrated in the exposure time of the TV camera 32 to increase the amount of light, the LED 14 is turned off outside the exposure time of the TV camera 32. Increase in power consumption and power consumption can be reduced.

It is a block diagram of the illuminating device which shows one embodiment of this invention. It is sectional drawing of an illuminating device same as the above. It is a wave form diagram which shows the relationship between the synchronizing signal of an illuminating device same as the above, the synchronizing frequency of a camera, and PWM control.

11 Lighting equipment
12 Instrument body
14 LED
21 Sync signal processor
22 Lighting device
31 Sync signal source
32 TV camera

Claims (1)

Multiple TV cameras to shoot the subject;
A synchronization signal source for generating a periodic synchronization signal for synchronizing the exposure time between the television cameras;
The configured television camera separately from a plurality provided for illuminating the subject, and, respectively instrument body using an LED as a photographing light source of the television camera, the synchronization inputs the synchronizing signal from the external signal processing unit When, a plurality and a lighting device for PWM controlling the LED to dimming or turning off outside lit exposure time in synchronization with the exposure time based-out Te Rebikamera the synchronizing signal input to the synchronization signal processing unit A lighting device ;
Capturing device of the television camera, characterized in that it comprises a.

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