JP2005116245A - Illumination fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illumination fixture in which light source energy can be utilized efficiently considering that a reflecting efficiency is low and energy loss is high in a conventional illumination fixture using a reflecting plate, since surface reflection of the constituting member has been generally utilized in order to invert backlight from the light source irradiated in the direction opposite to the illumination direction. <P>SOLUTION: Transparent reflecting mirrors formed with transparent materials are arranged so as to surround the backlight irradiated from the light source, and by using the total reflection generated in the interface of members of the transparent reflecting mirrors and gaps, the backlight are changed in directon, wherein the reflecting efficiency of the counterlights can be enhanced, thereby there is advantage that the light source energy can be utilized effectively. Application is possible for various kinds of illumination fixtures such as fluorescent lamp illumination fixtures, floodlights using electric bulbs, and vehicular headlights. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement of a lighting fixture using a reflector.

  In order to utilize a reverse light beam that is irradiated in a direction opposite to the direction in which illumination is desired, a method of reversing the traveling direction of the light beam with a reflector is generally used. For these reflectors, a method of applying surface reflection on the surface of a substance such as a member itself constituting a device main body or a mirror is generally applied, but the reflectance of the constituent substance (white paint is 60 to 85%, aluminum Therefore, it cannot be said that all of the light source energy is effectively used in the conventional reflector. For example, in a lighting fixture for a ceiling, if a light-reflecting plate coated with a white coating is used to reverse the light irradiated to the ceiling side to the floor side, the overall reflection efficiency is It was common to drop to 65-75%.

  Since the light from the lamp is generally emitted radially, in order to efficiently illuminate the target illumination range, a device has been devised to reverse the light direction opposite to the illumination direction to the target illumination direction using a reflector. Yes. However, in the method using surface reflection on the surface of the constituent material, sufficient reflection efficiency cannot be obtained in relation to the reflectance. An object of the present invention is to solve this problem and to provide a lighting fixture that can effectively use light source energy.

The present invention applies a total reflection of light that occurs at the interface between materials to reverse the direction of the light beam, and arranges a transparent reflector between the lamp and the luminaire body so that the reverse light beam The following light-shielding unit is applied for the purpose of inverting direct rays.
Japanese Patent Application No. 2003-106117

  Since the luminaire according to the present invention is a method of reversing the light in the direction opposite to the illumination direction by total reflection by the transparent reflecting mirror, the light can be efficiently reflected almost without being affected by the surface reflectance. There is an advantage that can be used effectively.

  The lighting fixture of the present invention is a method of reflecting a reverse light beam using a transparent reflector. However, a transparent material having a large refractive index with respect to air and a high transmittance is suitable for the material of the transparent reflector. In particular, glass or acrylic resin is suitable. Any material that transmits light may be colorless or colored. In addition, if a soft resin is used, a lighting apparatus using a flexible sheet-like transparent reflector can be realized.

  FIG. 1 shows an embodiment of a lighting apparatus according to the present invention using a transparent reflector, and is a sectional view simplified for the sake of explanation. Reference numeral 21 denotes a lamp serving as a light source. The left side is referred to as an illumination side, the right side is referred to as an instrument side, light directed from the light source toward the illumination side is referred to as a forward ray, and light directed toward the instrument side is referred to as a reverse ray. 2 is a plan view of the transparent reflecting mirror in a lighting fixture using a rod-shaped light source such as a fluorescent lamp when the transparent reflecting mirror in FIG. 1 is viewed in the direction of arrow m, and FIG. 3 is a transparent plan in the lighting fixture using a spherical light source such as a light bulb. It is a top view of a reflective mirror. FIG. 4 is an enlarged cross-sectional view of the periphery of the block n directly in front facing the illumination direction in FIG.

  In FIG. 4, the transparent reflecting mirror 1 is formed by connecting a block 2 having a substantially triangular cross section with a connecting margin 12 and connecting a block 3 having a substantially triangular cross section with a connecting margin 13. The one surface formed in step 1 is configured so that the corrugated rear plate 5 is engaged with the inclined surfaces of the front plate 4 and the rear plate 5, and is formed of a transparent material. The block 2 is formed by a front surface 6, an upper inclined surface 7, and a lower inclined surface 8 that face reverse rays, and the block 3 is formed by a rear surface 9, an upper inclined surface 10, and a lower inclined surface 11 that are substantially parallel to the front surface 6.

  Further, the upper slope 7 and the lower slope 8 of the block 2 are inclined at a1 and a2 with respect to the front surface 6, and the upper and lower slopes 10 and 11 of the block 3 are inclined with respect to the front surface 6 at inclinations b1 and b2. In addition, a slight gap 14 is formed between the slopes of each block due to the angle difference of the slopes. Furthermore, the upper slope and the lower slope of each block are gently curved over a part or the whole of the slope. The slope and the degree of curvature of these slopes are optimal for adjusting the direction of the rays so that the reverse rays are totally reflected, or the forward rays after being reflected avoid the lamp as much as possible and reach the illumination side. Selected.

  Further, in order to reduce the reflection area and reduce the size, the transparent reflecting mirror 1 is curved between the lamp 21 of the light source and the instrument body 22 so as to surround the reverse light from the light source, as shown in FIG. Be placed. In the front block n facing the illumination direction and the upper and lower blocks p, q facing sideways, the reflection angle for reversing the direct ray from the light source and the forward ray after total reflection to the illumination side Will be different. Therefore, in the block n, the slopes a1 and a2 of the upper slope and the lower slope and the slopes b1 and b2 may be the same, but in the case of the horizontally oriented blocks p and q, the slope a1 of the upper slope and the lower slope The best shape is selected by changing a2 and the slopes b1 and b2 or adjusting the curvature of the slope. The use of a material having a high refractive index makes it easier to select the block shape.

  The reverse light reversal process in the transparent reflecting mirror 1 will be described. In FIGS. 1 and 4, the oblique reverse light beam d irradiated from the light source is incident from the front surface 6 of the block 2 and refracted, and then is reflected on the upper slope 7. To reach. At that time, if the critical angle of total reflection peculiar to the material is not exceeded, the light beam d is transmitted, but if it exceeds the critical angle, it is totally reflected and reaches the lower slope 8. The light beam totally reflected also on the lower slope 8 reaches the upper slope 7 again, but this time it hits at an angle closer to vertical, so that the light passes through the gap 14 and is refracted and transmitted from the upper slope 7. Enter block 3. Subsequently, total reflection is performed on the back surface 9 to change the direction as a forward ray, and the total reflection is repeated from the lower slope 11 to the air gap 14 and the upper block 7 from the lower slope 8 to the upper slope 7 and the lower slope 8. The illumination side is irradiated from the front surface 6 as indicated by an arrow d. Similarly, in the case of the reverse ray e that hits substantially perpendicular to the transparent reflecting mirror, it is reversed through the same path as shown by the arrow and becomes a normal ray and is irradiated from the front surface. In this way, the reverse ray that has entered the transparent reflector repeatedly undergoes total reflection on the upper slope, lower slope, and back of each block, and then changes its direction as a forward ray and is applied to the illumination side to achieve the purpose of total reflection. It will be.

  In the inversion process of the light beams in the upper and lower blocks p in the horizontal direction, since the slopes of the upper slope and the lower slope are different, the reverse light f from the light source is irradiated while changing the direction to the illumination side through a path like an arrow. . The same applies to the reverse ray g. In the case of a block located between the front block n facing the illumination direction and the upper and lower blocks p and q which are turned sideways, the inclination of the upper and lower slopes and the degree of curvature of the slopes of the blocks n and p and q are determined. The function of the reflector can be exhibited by setting to an intermediate specification.

  Although the front plate 4 and the rear plate 5 constituting the transparent reflecting mirror 1 are formed by connecting the blocks 2 and 3 with the coupling margins 12 and 13, the coupling margin is not directly related to the control of the light beam. The width of the coupling allowance is set in a range that does not affect the manufacturing convenience and the progress of the light beam, but about 0.01 to 1 mm is usually sufficient.

  The transparent reflector can be made more compact by bringing it closer to the light source. However, if the lamp is too close to the lamp, the forward ray reflected from the front block n facing the illumination direction or the adjacent block may be blocked by the upper and lower blocks and not irradiated to the illumination side. For this reason, setting is easy if the upper and lower blocks, which are horizontally oriented compared to the block in front, are arranged slightly apart from the light source.

  Progress of light transmitted through the block by providing a slight angle difference between the slopes a1 and b1 or the slopes a2 and b2 of the upper and lower slopes of the blocks 2 and 3 of the transparent reflector 1. The direction can be finely adjusted. For example, a light ray h having a small incident angle with respect to the lower slope 8 is transmitted through the block 2, but the direction after transmission can be corrected by this angle difference, so that it is easy to totally reflect in the following process. It becomes. Of course, the slopes of the block 2 and the block 3 may be the same. In this case, light rays exceeding a predetermined angle are totally reflected on the upper and lower slopes, but light rays that do not reach total reflection are transmitted without changing the traveling direction.

  Since the transparent reflecting mirror is formed of a transparent material, the reverse light beam is hardly absorbed and inverted, and the loss of light energy is extremely small, so that it can be efficiently reflected. In addition, since most of the surface-reflected light beams reflected on the surface of each block are light beams directed toward the front surface side, there is almost no risk of reducing the illumination efficiency.

  As described above, the lighting apparatus according to the present invention efficiently reverses the direction of the reverse light beam by the transparent reflector disposed so as to surround the reverse light beam from the light source and reflects the reflected light to the illumination side. FIG. 2 is a front view of a transparent reflecting mirror used in a lighting apparatus with a rod-shaped light source such as a fluorescent lamp, but the present invention can also be used in a lighting apparatus with a spherical light source such as a light bulb. FIG. 3 is a front view of a transparent reflecting mirror used in a lighting device such as a projector. Each of the transparent reflectors has the same cross section as that in FIG. 1 and functions in the same manner.

  Depending on the incident angle of the light beam hitting the transparent reflecting mirror, a light beam that passes through each block and exits to the instrument side is assumed. If the back of the transparent mirror is coated with white to reflect the light by surface reflection, or by depositing a metal film such as aluminum, the light that passes through can be blocked, thus increasing efficiency. Can do.

  In various lighting fixtures using fluorescent lamps, various lighting fixtures such as floodlights and automobile headlights, it is possible to improve lighting efficiency and save energy.

  The corrugated front plate and rear plate constituting the transparent reflecting mirror can be easily molded by, for example, injection molding or press molding. A curved transparent reflector can also be formed by bending a front plate and a rear plate molded in a flat state at a connecting margin portion. Moreover, since the function does not change even if it is reduced in a similar shape, a thinner transparent reflector can be made by making the front plate and the rear plate with countless minute blocks. Since the transparent mirror is a method of reflecting using total reflection occurring at the interface between the transparent block and the gap, a minute gap existing between the slopes of the block 2 and the block 3 is indispensable. For this reason, in order to integrally form the front plate 4 and the rear plate 5 to form a transparent reflecting mirror, partial joining is performed at a predetermined interval using ultrasonic welding or the like.

Sectional view of a luminaire according to the invention Front view of a transparent reflector applied to a fluorescent lighting fixture Front view of a transparent reflector applied to a bulb luminaire Cross-sectional view enlarging the front block facing the lighting direction

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transparent reflecting mirror 2 Block 3 Block 4 Front plate 5 Rear plate 6 Front surface 7 Upper slope 8 Lower slope 9 Back surface 10 Upper slope 11 Lower slope 12 Connection allowance 13 Connection allowance 14 Air gap 21 Lamp 22 Instrument main body

Claims (1)

  A transparent reflector is formed by connecting blocks with a substantially triangular cross-section at the connection allowance, forming a front plate and a rear plate with corrugated one side with a transparent material, and combining the front plate and the rear plate so that the slopes mesh with each other. A lighting fixture characterized in that it is arranged between the lamp and the fixture body so as to surround the reverse light from the light source.

Images