JPS61128402A - lighting equipment - 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 Industrial Application The present invention relates to lighting equipment used for lighting in video conference rooms that connect remote conference rooms through two-way communication of video and audio, and for lighting in other television studios. It is.

Conventional technology In general, what is required for this type of lighting is: - Sufficient illumination must be provided to the person who is the subject of the television camera.
The subject's face should not have sharp shadows or its facial expressions change drastically depending on the position and direction of the subject's face ■The subject should not be exposed to glare from the lighting ■The subject should not be exposed to heat caused by the heat of the lighting This includes not making people feel that way. By the way, in the conventional lighting of this kind, spotlights of multiple incandescent bulbs are used.
Although item (■) was satisfactory, items (■) and (■) were unsatisfactory.

On the other hand, it is possible to use multiple fluorescent lamps to solve the problems in Items ■ and ■. It is difficult to obtain the subject illuminance. The present invention takes into account the above-mentioned conventional problems and aims to provide a lighting fixture that can solve all of the above-mentioned four problems.

Means for Solving the Problems In order to achieve the above object, the present invention arranges a plurality of fluorescent lamps in the front and back direction and arranges each reflector of each fluorescent lamp so that the reflected light is focused on a specific position in front. The lighting equipment has a structure in which a light shielding plate having a large number of holes is disposed in the irradiation optical path of each of the fluorescent lamps.

Effect: According to the above configuration, the irradiation light of each fluorescent lamp is condensed and irradiated onto a specific position in front, that is, the person who is the subject of the television camera, and sufficient illuminance is obtained for photographing with the television camera, and the irradiation light of the fluorescent lamps is Therefore, there are no sharp shadows or extreme changes in facial expressions depending on the position or orientation of the subject's face. Furthermore, the person who is the subject will not feel hot or stuffy due to the illumination light, and since a light-shielding plate with many holes is installed in the irradiation light path, the person who will be the subject will not feel the heat caused by the illumination. It is.

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 forward 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 protrude obliquely from the center, and the electronic whiteboard 4 is disposed on the protruding wall surface. A plurality of monitor televisions 5 are built into the front part of the conference desk 2 to display materials and data written on an electronic tablet or electronic blackboard.

In the video conference room 1, conference participant lighting fixtures 6 are arranged so that their far ends meet the ceiling above the conference desk 2 and are at a position of 36° to 50° above the horizontal line of sight of the participants. A wall lighting fixture 7 is placed on the ceiling close to the wall behind the conference participant, and a front screen peripheral lighting fixture 8 is placed on the ceiling above the screen 3 placed in front of the conference participant. However, an electronic blackboard lighting fixture 9 is disposed on the ceiling close to the electronic whiteboard, and a lighting fixture 1o for lighting around the control equipment room entrance door is disposed on the ceiling close to the artificial door of the control equipment room 12. 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. 3, the conference participant lighting fixture 6 includes a plurality of fluorescent lamps 6a arranged in the front-rear direction, a plurality of reflectors 6b corresponding to each fluorescent lamp 6&, and an irradiation optical path of the fluorescent lamp 6a. It consists of a light shielding plate 6C disposed inside. The reflector plate 6b consists of two parts, front and back, divided by a line perpendicular to the fluorescent lamp e&, the rear part being a diffuse reflection surface (6b-1), and the front part being a specular reflection surface (6b-2).
) and the reeds are both formed with a curvature that condenses the light from the fluorescent lamp 62L and reflects it effectively and appropriately to the conference participants. In order to suppress direct glare from the fluorescent lamp 6a, the light shielding plate 6C has a large number of holes with an open area ratio of 20 to 50%, and its surface is finished in white.

In the illumination device having the above configuration, when the conference participants are photographed by the television camera, the conference participant lighting fixture 6:
In addition to obtaining the vertical illuminance required for color TV camera photography at the face position of the meeting participants,
The lighting equipment must be placed at a position 300 or more above the horizontal line of sight of the meeting participants, commonly referred to as the glare zone, and reflect the light from the fluorescent lamps effectively and appropriately in the direction of the meeting participants. At the same time, direct glare from the lighting fixtures is barely perceptible due to the glare-suppressing reflector structure and fluorescent lamp shading plates. In addition, since 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 their facial expressions depending on the position and orientation of their faces. Furthermore, incandescent light bulbs use heat radiation as a light source, so the required 1500
Lighting around 1X can make people feel hot, but since fluorescent lamps are light sources that use luminescence, the irradiance per unit of illuminance is about 1/4 to 115 that of incandescent bulbs, making lighting equipment feel uncomfortable. There's nothing to do. In addition,
The wall surface behind the conference participants is also illuminated by the wall lighting fixture 7 with asymmetrical light distribution at a level of approximately Too to 1000 lx 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 , to prevent the surrounding area from becoming extremely dark and creating a movie theater-like or gloomy atmosphere, and
I also try to reduce 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, suitable illumination is provided to a person as a subject for color television photography in a video conference room, etc.
The effect is great because it does not dazzle the person who is the subject and does not make them feel hot.

[Brief explanation of drawings]

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. 3 is a sectional view of the device for illuminating conference participants. . 1... Video conference room, 6... Meeting participant lighting equipment, 6a... Fluorescent lamp, 6b...
...Reflector, 6c... Light shielding plate.

Claims (3)

[Claims] (1) While arranging multiple fluorescent lamps in the front and back direction,
A lighting device in which each reflective plate of each fluorescent lamp is arranged so that the irradiated light is focused on a specific position in front, and a light shielding plate with a large number of holes is arranged in the irradiated optical path of each fluorescent lamp. (2) The reflector has a white diffuse-reflecting surface at the rear divided by a perpendicular line passing through the fluorescent lamp, and a specular reflective surface at the front, and each of the white diffuse-reflective surface and the specular reflective surface reflects reflected light forward. The lighting fixture according to claim 1, which has a curved surface. (3) The light shielding plate has a white painted surface and a porosity of 20
50%.