JPH0234121B2 - - Google Patents

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 other TV studios. It is.

BACKGROUND TECHNOLOGY In general, this type of lighting requires that sufficient illumination be provided to the person who is the subject of the television camera; The facial expressions should not change drastically, the subject should not be exposed to glare from the lighting, and the subject should not feel hot due to the heat of the lighting. By the way, in the conventional lighting of this kind, spot lights of a plurality of incandescent bulbs are used, and although the above-mentioned items are satisfied, the items mentioned above are insufficient. In order to solve one term,
Although it is possible to use multiple fluorescent lamps,
Fluorescent lighting fixtures with a generally widely used target light distribution have approximately 1,000 to
It is difficult to obtain a subject illuminance of 1500lx. 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-back direction, provides a reflection plate for each fluorescent lamp, and has a large number of holes in the irradiation optical path of each fluorescent lamp. A light-shielding plate is provided, and the rear part of the reflecting plate divided by a perpendicular line passing through the fluorescent lamp is a white diffuse-reflecting surface, and the front part is a specular-reflecting surface, and the white diffuse-reflecting surface and the specular-reflecting surface are each It has a curved surface that directs reflected light to a specific position in front.

Effect According to the above configuration, the rear part of the reflector plate divided by a perpendicular line passing through the fluorescent lamp is a white diffuse reflection surface, and the front part is a specular reflection surface, and each reflection surface directs reflected light to a specific position in front. Because the surface is curved, the light emitted from each fluorescent lamp is focused on a specific position in front of the person, who is the subject of the TV camera, providing sufficient illuminance for shooting with the TV camera. Because it uses light, sharp shadows will not be created depending on the position and orientation of the subject's face, nor will extreme changes in facial expressions occur. Furthermore, the person who is the subject will not feel hot due to the illumination light, and the person who will be the subject will not feel the glare caused by the illumination because a light shielding plate with many holes is installed in the irradiation light path. It is something.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In FIG. 1, 1 is an approximately rectangular video conference room, 2 is a conference desk installed approximately 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, which receives information transmitted from the other party. A screen 4 is an electronic blackboard on which images, materials, data, etc. of the conference participants on the other side 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 projecting shape with both sides slanting from the center, and the electronic whiteboard 4 is disposed on the projecting 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 an electronic blackboard.

In the video conference room 1, a conference participant lighting fixture 6 is arranged on the ceiling above the conference desk 2 so that its far end is located at a position of 35° to 50° above the horizontal line of sight of the conference participants, A wall lighting fixture 7 is placed on the ceiling close to the wall behind the conference participants, and a front screen peripheral lighting fixture 8 is placed on the ceiling above the screen 3 placed in front of the conference participants. Furthermore, an electronic blackboard lighting fixture 9 is installed on the ceiling close to the electronic blackboard, and a lighting fixture 10 for lighting around the control equipment room entrance door is installed on the ceiling close to the entrance door of the control equipment room 12.
will be placed. 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, the distance between the conference desk 2 and the wall behind it will be A general lighting fixture 11 is provided.

The conference participant lighting fixture 6 includes a plurality of fluorescent lamps 6a arranged in the front-back direction as shown in FIG. It consists of a light shielding plate 6c disposed inside. The reflective plate 6
b consists of two parts, front and back, divided by a perpendicular line to the fluorescent lamp 6a; the rear part is a diffuse reflection surface 6b-2, and the front part is a specular reflection surface 6b-1, both of which collect light from the fluorescent lamp 6a. It is formed with a curvature that allows light to be reflected effectively and appropriately to meeting participants. The light shielding plate 6c has an aperture ratio of 20 to suppress direct glare from the fluorescent lamp 6a.
It has a large number of pores that account for ~50% of the total porosity, and the surface is finished in white.

In the lighting device having the above configuration, when photographing conference participants with a television camera, the conference participant lighting fixture 6 provides a vertical illuminance of approximately 1500 lx necessary for color television camera photographing at the position of the conference participant's face. In addition, the lighting equipment must be located at a position of 30° or more above the horizontal line of sight of conference participants, which is generally referred to as the glare zone, and must be located within an effective and appropriate direction from fluorescent lamps in the direction of conference participants. Direct glare from lighting fixtures is almost imperceptible due to the structure of the reflector plate that suppresses glare while reflecting light from the lamp, and the fluorescent lamp light shielding plate. Fluorescent lamps also provide highly diffused light, so depending on the position and direction of the meeting participants' faces, there will be no strong shadows on the faces or drastic changes in facial expressions, making it possible to make people's faces look normal. Furthermore, since incandescent lamps are a light source that uses thermal radiation, lighting around the required l500lx will give a feeling of heat, but fluorescent lamps are a light source that uses luminescence, so the irradiance per unit illuminance is It's about l/4 to l/5 of an incandescent bulb, so you won't feel the heat from lighting equipment. Note that the wall surface behind the conference participants should also be set at approximately 700 to 700 mm to prevent it from being extremely dark compared to the area facing the conference participants due to the wall lighting fixture 7 having asymmetric light distribution.
It is illuminated at l000lx, which prevents noise from appearing on the TV screen and insufficient illumination for the TV camera even when shooting with a long shot. Furthermore, the peripheral area of the front screen on which images, materials, data, etc. of the participants on the other side transmitted from the other side are projected is illuminated by the front screen peripheral area illumination device 7, and the brightness of the screen screen is On the other hand, this prevents the surrounding areas from becoming extremely dark, creating a movie theater-like or gloomy atmosphere, and also reduces eye fatigue. Also, the incident light on the screen surface is approximately
This is suppressed to 200 lx or less to prevent image contrast from decreasing due to excessive light hitting 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., and the person as a subject is protected from glare. The effect is great because it does not cause heat or make you feel hot or stuffy.

[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... Conference participant lighting equipment, 6a... Fluorescent lamp, 6b... Reflector, 6
c... Light shielding plate.

Claims (1)

[Scope of Claims] 1. A plurality of fluorescent lamps are arranged in the front-back direction, a reflecting plate is provided for each fluorescent lamp, and a light shielding plate having a large number of holes is arranged in the irradiation optical path of each fluorescent lamp, and the The rear part of the board, which is divided by a perpendicular line passing through the fluorescent lamps, has a white diffuse reflection surface,
The lighting equipment has a front portion as a specular reflection surface, and each of the white diffuse reflection surface and the specular reflection surface is a curved surface that irradiates reflected light to a specific position in front. 2 The surface of the light-shielding plate is painted white, and the porosity is
20-50% of the luminaire according to claim 1.