JPS61128401A - Lighting apparatus for tv conference chamber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lighting device for a video conference room that connects remote conference rooms through two-way video and audio communication.

BACKGROUND OF THE INVENTION Video conferencing systems have generally been developed. This video conferencing system connects remote conference rooms using two-way video and audio communication, and transmits images, materials, and data of conference participants on the other side in front of a television camera and microphone. A conference system that allows both parties to conduct a conference as if they were in the same conference room while looking at the conference room. This conference system is also called a teleconference, video conference, or remote conference, and is intended to improve the efficiency of business activities by eliminating the time and effort associated with conference expenses and travel.

The video conference room used in the above has not been around for a long time, and general office rooms and conference rooms are used.

These conference rooms are equipped with a general lighting system in which lighting fixtures installed in the ceiling or directly attached to the ceiling with symmetrical light distribution are arranged at equal intervals on the ceiling surface. In addition, the video conference room
Naturally, a screen that displays the situation on the other side and a television camera to send images to the other side are installed. And for color TV shooting, ideally around 200
011! , a minimum object illuminance of approximately 10,001x is required, but the above-mentioned general illumination device usually has an illuminance of 150-5x.
001x L cannot be obtained, and the subject illuminance is insufficient. To compensate for this, additional incandescent spotlights may be installed to primarily illuminate the faces of conference participants.

Problems to be solved by the invention (1) Lighting devices for general offices and conference rooms do not provide the necessary subject illumination required for color television photography, making it impossible to obtain clear images on the screen. . In addition, in order to compensate for the lack of illumination of the subject, a lighting system that additionally installs an incandescent lamp spotlight has a required illuminance of approximately 20,001x, which causes meeting participants to experience strong glare from the lighting system. Even if you use lamps and appliances that use infrared-cutting front glass or infrared back-transmitting reflective films to suppress heat, incandescent light bulbs are light sources that use heat radiation, so you can't avoid feeling hot. Moreover, the heavy use of spotlights gives the room a strong studio-like feel, which does not suit the atmosphere required for a conference room for discussion and decision-making while promoting multifaceted communication.

(2) When a discharge lamp is used as a light source for illumination in an area where the power supply is 50 Hz, 60 fields/
The subject is photographed and transmitted using a second TV camera under illumination that flashes at 1oQH2, and flickers occur on the screen because the emission frequency of the video and the flashing frequency of the discharge lamp do not match.

(3) To solve the problem mentioned in the previous two items, three discharge lamps are lit as a set using a three-phase power supply, and the emission phase of each of the three discharge lamps is shifted by one. It is also possible to increase the lighting frequency as a composite light by increasing the lighting frequency, but in this case, three discharge lamps -
This requires a set of lighting fixtures, and it is not possible to use a lighting fixture that uses an arbitrary number of discharge lamps depending on the required lighting conditions. Furthermore, since it requires a three-phase power supply, it is difficult to secure a power supply easily.

The present invention takes into consideration the problems of the prior art, and eliminates the need to create a studio-like atmosphere for conference participants by meeting the lighting requirements necessary for filming with a television camera, as well as hand-held lighting and lighting requirements for general conference rooms. The purpose of this invention is to provide a lighting device for a video conference room that satisfies the lighting requirements for a video conference room that can easily project and recognize mutual facial expressions and facilitate smooth communication. be.

Means for Solving the Problems In order to achieve the above object, the present invention is provided with a lighting device for photographing with a television camera, the light source of which is a fluorescent lamp, and the fluorescent lamp is connected to a high frequency lighting circuit with a smoothing circuit. It is configured so that it lights up.

Operation With this configuration, the flashing frequency of the fluorescent lamp is 1~1oo.
KHz, and even if the TV camera transmits images at 60 fields/second, in practical terms, there will be no flicker on the screen, and the required lighting environment for filming with the TV camera can be obtained, and the faces of the conference participants can be clearly seen. It is possible to create a lighting environment that allows sufficient communication between conference participants based on how they see things, and a lighting environment that reduces fatigue.

Furthermore, it does not give off the studio-like atmosphere that tends to be felt when filming with television cameras.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. 1st
In the figure, 1 is an approximately rectangular video conference room, 2 is a conference desk installed almost in the center of the conference room 1, and 3 is a conference desk installed on the front wall of the video conference room 1 to which the other party sends information. A screen 4 is an electronic blackboard on which videos, materials, data, etc. of side meeting participants are projected. When viewed from above, the conference desks 2 are arranged in a substantially circular arc shape with both sides positioned ahead of the center, so that a plurality of conference participants can sit facing forward. When viewed from above, the front wall of the video conference room 1 has a shape in which both sides of the wall protrude at an angle with respect to the center, and the electronic whiteboard 4 is disposed on the protruding wall surface. A plurality of monitor televisions 5 that display materials and data written on an electronic tablet or an electronic blackboard are built into the front part of the conference desk 2. The conference participant lighting fixture 6 is arranged so that its far end is located 35° to 50' above the horizontal line of sight of the conference participants, and the ceiling surface close to the wall behind the conference participants is A wall lighting fixture 7 is placed on the ceiling above the screen 3 placed in front of the conference participants, and a front screen periphery lighting fixture 8 is placed on the ceiling near the electronic blackboard. On the ceiling where the fixture 9 is close to the artificial door of the control equipment room 12, a lighting fixture 10 for lighting around the entrance door of the control equipment room is arranged. Note that the distance between the conference desk 2 and the front screen 3 is set at approximately 3 to 4 meters because it is necessary to ensure that the size of the image of the conference participant on the other side that is transmitted is at least a certain size. However, the distance between the conference desk 2 and the wall behind it varies depending on the size of the room, so if this distance is greater than approximately 3 meters, general lighting must be turned on to compensate for the extremely dark space between them. equipment 11 is installed.

As shown in FIG. 2, the conference participant illumination device 6 includes a plurality of fluorescent lamps 6a, a reflector plate eb-1°6b-2, and a fluorescent lamp shade plate 6C, and the reflector plate 5b-2. 1
, 5b-2 are formed with a curvature that effectively and appropriately reflects the light from the fluorescent lamp 6a to the conference participants, and furthermore, in order to suppress the direct glare given to the conference participants from the lighting equipment 6, Reflector plate 6b-2 located at the rear when viewed from above
has a white painted finish, and the reflector 6b-1 located at the front when viewed from the conference participants has a mirror finish in order to effectively and appropriately reflect the light from the fluorescent lamp 6b to the conference participants. Note that the light shielding plate 6C is only for suppressing direct glare from the fluorescent lamp 6a.

As shown in FIG. 3, the wall lighting fixture 7 behind the conference participants consists of a fluorescent lamp 7a and a reflector plate, and the reflector plate 7b has a mirror finish to block most of the light from the fluorescent lamp 7a. The conference desk 2 is formed with a curvature that reflects the wall surface.
There is almost no reflected light in the direction of , and therefore there is no reflection of the high-intensity light emitting section on the CRT screen of the monitor television 6 built into the conference desk 2. Further, the reflector plate ab has a structure that allows the reflector plate 7b to be movably adjusted by loosening the adjustment button 7C so that the wall surface can be illuminated almost uniformly from the upper end to the lower end.

Front screen peripheral lighting equipment 8. Electronic blackboard lighting equipment9. Lighting equipment around the control equipment room entrance door 10. The general lighting fixtures 11 are all lighting fixtures that use a fluorescent lamp as a light source, and the front screen peripheral lighting fixture 8 has a narrow angular light distribution, and is designed to mainly illuminate the upper wall of the front screen. It is placed close to the wall to brightly illuminate the area around the front screen while suppressing incident light to the front screen as much as possible.

In addition, the fluorescent lamps used in the lighting equipment are blue (450 nm), green (540 nm), red (6
Using a 3-wavelength fluorescent lamp with a color temperature of 5Q○OK that efficiently concentrates light in 3 wavelength regions (10 nm), we also transmit the emission frequency of illumination light generated in other regions at 50 Hz and TV images. 40 to 50 KH as shown in Figure 6 to prevent screen flickering due to mismatch with the field frequency.
High frequency lighting with Z smoothing circuit is performed. In the figure, 13 is a smoothing circuit, 14 is a high frequency oscillation circuit, and 15 is a fluorescent lamp.

In the illumination device having the above configuration, when the conference participants are photographed by the television camera, the conference participant lighting fixture 6:
Vertical illuminance of around 15,001x, which is necessary for color TV camera photography, can be obtained at the face position of the meeting participants, and the lighting equipment can be placed at least 30 degrees above the horizontal line of sight of the meeting participants, which is generally called the glare zone. The reflector structure and fluorescent lamp shading plate effectively and appropriately reflect the light from the lamp in the direction of meeting participants, while also preventing direct glare from the lighting equipment. I can hardly feel it. In addition, because fluorescent lamps are highly diffused lights, they can portray people's faces in a normal manner without creating strong shadows on the faces of meeting participants or causing drastic changes in facial expressions depending on the position and orientation of the participants' faces. In addition, incandescent light bulbs use heat radiation as a light source, so the required 1500
Lighting around 1x will make you feel hot, but since fluorescent lamps are light sources that use luminescence, the irradiance per unit of illuminance is about % of that of incandescent bulbs, reducing the heat caused by lighting equipment. I don't feel it. Furthermore, since the fluorescent lamp is based on a high-frequency lighting circuit with a smoothing circuit, there is no flicker in the video signal from the television camera, and a good video can be sent to the other party. In addition, the wall surface behind the conference participants is also illuminated by the wall lighting fixture 7 with asymmetrical light distribution to approximately 700 to 1001y: so as not to be extremely dark compared to the portion of the conference participants. This prevents noise from occurring and insufficient illumination for the TV camera even when taking long shots. Furthermore, the peripheral area of the front screen on which videos, materials, data, etc. of the other party's participants transmitted from the other party are projected is illuminated by the front screen peripheral area lighting device 7, and the brightness of the screen is This prevents the surrounding area from becoming extremely dark, creating a movie theater-like or gloomy atmosphere, and also reduces eye fatigue. Furthermore, the amount of light incident on the screen surface is suppressed to about 2001x or less, thereby preventing a reduction in image contrast due to excessive light incident on the screen surface. Of course, the lighting system in this example is necessary to ensure hand lighting, which is a lighting requirement for a general conference room, to suppress direct glare from lighting equipment, to suppress reflected glare, and to easily recognize facial expressions among conference participants. In addition to ensuring adequate vertical illuminance, a lighting environment with less fatigue can be obtained, and it also eliminates the studio-like or movie-theater atmosphere that tends to occur in video conference rooms.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention, the light source of the lighting equipment is a fluorescent lamp, which is lit by a high-frequency lighting circuit with a smoothing circuit. appropriate lighting is provided,
In addition, it is possible to create an appropriate video environment and lighting environment.
The effect is significant.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the arrangement of a lighting device in a video conference room according to an embodiment of the present invention, FIG. 2 is a side view of the same, and FIG. FIG. 4 is a cross-sectional view of the wall lighting fixture behind the conference participants, and FIG. 5 is a diagram of the lighting circuit. 1...TV conference room, 6...Meeting participant lighting fixtures, 7...Wall lighting fixtures behind conference participants, 13...Smooth Circuit, 14...
・High frequency oscillation circuit, 15... Fluorescent lamp.

Claims (1)

[Claims] A lighting device for a television conference room, comprising a lighting device for photographing with a television camera, the light source of which is a fluorescent lamp, and the fluorescent lamp is illuminated at high frequency using a high frequency lighting circuit with a smoothing circuit.