JP4396288B2 - lighting equipment - Google Patents

Description

  The present invention mainly relates to a light fixture for light guide display.

Conventionally, there are various light guide display lighting fixtures, and as shown in Patent Document 1, the light that is printed on the bottom surface of the light guide plate with white ink and guides light while totally reflecting inside the light guide plate. Some have a dot pattern for light diffusion to be emitted from the front. By increasing the area ratio of the dot pattern as the distance from the light source disposed on the incident end face of the light guide plate increases, unevenness of light emitted from the front of the light guide plate can be reduced.
Japanese Patent Laid-Open No. 08-240720

  When a plurality of light sources are used in the light guide type display lighting fixture, the light source abutting portion and the light source end portion have dark shadows on the display surface, and therefore it is necessary to perform printing for improving light unevenness on the light guide plate.

  However, since the position of the light source abutting portion changes depending on the light source to be combined, it is necessary to produce a printing plate with a countermeasure against light unevenness for each light source type for each size difference.

  The present invention is intended to solve the above-described problems, and provides a lighting apparatus capable of improving the light unevenness of the light source abutting portion with light guide plates having different dimensions without producing printing plates according to sizes. It is to be.

The lighting fixture of the present invention is a plate-like shape having an end surface as an incident surface on which light is incident and a surface as a light guide surface from which light is emitted, and a light guide plate that emits light incident from the incident surface from the light guide surface; In a lighting apparatus comprising a plurality of light sources arranged on the end face and arranged in a line,
Printing the first pattern for light diffusion in which the area ratio of the printed area increases as the distance from the light source increases on the light guide surface or the opposite surface;
A second pattern for light diffusion, in which the area ratio of the printed area decreases as the distance from the light source butting portion increases around the light source butting portion on the light guide surface or the opposite surface, is the second pattern. Is printed so that it is almost radial and spreads in a semicircular shape
A third pattern is printed on the periphery of the light source end portion on the light guide surface or the opposite surface, and the area ratio of the printed area decreases as the distance from the light source end portion increases. It is characterized in that the second pattern is equal to one of the portions roughly divided by a line perpendicular to the longitudinal direction of the light source .

  According to the lighting apparatus of the present invention, by producing a partial printing plate for printing the second pattern for improving light unevenness, even when the position of the light source butting portion of the light guide plate is changed by the light source used, There is no need to manufacture and stock a panel printing plate each time, and printing using the same partial printing plate around the light source butting portion can improve the illuminance drop due to uneven light on the display surface.

  For this reason, even when the total length of the instrument, that is, the total length of the light guide plate is changed depending on the light source used, it is possible to perform partial printing by setting the light source abutting portion to an arbitrary position with respect to the light guide plate. In other words, there is no need to manufacture a new printing plate for each panel size as in the past, and it can be easily handled even if the position of the light source abutting portion with respect to the light guide plate is not constant, and the display surface is a simple light guide type that can be replaced. The present invention can be applied to a display lighting device.

  Similarly, the third pattern can be printed on the light source end portion.

  Further, the second pattern is substantially equally divided by a line perpendicular to the longitudinal direction of the light source, and one side of the second pattern is used as a third pattern, so that the second pattern is printed using a printing plate for printing the third pattern. Can be printed, which is convenient.

  A light guide type display luminaire applied to an evacuation guide light, an indicator light and the like according to a first embodiment of the present invention will be described with reference to FIGS. The lighting fixture includes a fixture body 1, light guide plates 2 and 3, and display panels 4 and 5.

  The instrument main body 1 has a pair of straight tube light sources 8 and 9 arranged in a line parallel to the longitudinal direction in a horizontally long cylindrical main body case 7. The light sources 8, 9 are, for example, 32 W straight tube fluorescent lamps. An opening extending substantially the entire length in the longitudinal direction is formed on the lower surface and one side surface of the main body case 7, and the side surface opening 10 is opened and closed with a cover 11 as an inspection port for replacing the light sources 8 and 9. The upper ends of the light guide plates 2 and 3 are inserted. By inserting the upper ends of the light guide plates 2 and 3 into the lower surface opening 12, a plurality of linearly arranged light sources 8 and 9 are arranged on the end surfaces (13) of the light guide plates 2 and 3. Reference numeral 18 denotes a suspension means such as a pipe, which is suspended from the ceiling, and 17 is a main body end.

  The light guide plates 2 and 3 have a plate shape in which an end surface is an incident surface 13 on which light is incident and a surface is a light guide surface 14 from which light is emitted, and light incident from the incident surface 13 is emitted from the light guide surface 14. To do. In the embodiment, the two light guide plates 2 and 3 are overlapped, the outer sides thereof are used as the light guide surface 14, the lower ends are supported by a frame 15 having a U-shaped cross section, and both ends are covered by an end frame 16 having a U-shaped cross section. The lower end of the end frame 16 is connected to both ends of the connector 15 by connecting means, and the upper end of the end frame 16 is attached to the lower surface of the main body case 1 by attaching means.

  The display panels 4 and 5 are disposed so as to cover the light guide surface 14 of the light guide plates 2 and 3, and the periphery is supported by the frame 15 and the end frame 16. The display contents of the display panels 4 and 5 (omitted by oblique lines) are illuminated by light emitted from the light guide surfaces 14 of the light guide plates 2 and 3.

  In this manner, the incident surface 13 of the light guide plates 2 and 3 is housed and fixed inside the main body case 7 in which the light sources 8 and 9 are built, and light from the light sources 8 and 9 is incident and guided from the incident surface 13. Thus, a display illuminating device in which a plurality of light sources are arranged in a linear shape is configured to be illuminated and displayed through the translucent display panels 4 and 5 stacked and attached to the light guide surfaces 14 of the light guide plates 2 and 3.

  As the distance from the light sources 8 and 9 increases on the side opposite to the light guide surface 14 of the light guide plates 2 and 3, that is, on the overlapping side of the light guide plates 2 and 3, the print area ratio (print area per unit area) increases. A first pattern 19 for increasing light diffusion is printed. For printing, for example, white dot printing is performed using a printing plate, and the size of each dot is formed so as to gradually increase according to the distance from the light source. In the embodiment, the first pattern 19 is formed on almost the entire light guide surface 14. When light is incident on the printed white dot, the light is diffusely reflected and the portion of the light guide surface 14 is brightened. However, when the area of the dot is large, more light is diffused. It becomes even brighter. Therefore, when the first pattern 19 is not printed, the light guide surface 14 becomes darker as the distance from the light sources 8 and 9 becomes darker, and display unevenness occurs. However, when the first pattern 19 is printed, the light sources 8 and 9 Since the area ratio increases with increasing distance, more light is diffused, so that the brightness of the light guide surface 14 can be made uniform as a whole, and display unevenness can be eliminated.

  Further, the area ratio of the printed area decreases as the distance from the light source abutting portion 22 increases on at least a part of the first pattern 19 around the light source abutting portion 22 of the light guide surface 14, and the light diffusion exhibits a substantially radial shape. The second pattern 20 for printing is printed. As in the case of the first pattern 19, printing is performed using white printing on a printing plate so that the size of each dot is gradually increased according to the distance from the light source. In the embodiment, the light guide surface 14 is locally formed. The printing plate prints a pattern as shown in FIG. 5, and a second pattern 20 is formed by printing a pair of the patterns so as to be symmetrical.

  Further, the third pattern 21 having a smaller print area ratio as the distance from the light source end portion 23 is increased on at least a part of the first pattern 19 around the light source end portion 23 of the light guide surface 14. Is printing. This printing is also the same as the pattern shown in FIG. 5, and a printing plate can be used in common. That is, the third pattern 21 is equal to one of the second pattern 20 that is substantially equally divided by a line perpendicular to the longitudinal direction of the light sources 8 and 9. Therefore, the printing plate used for the printing in FIG. 5 can be printed as it is, or symmetrically used by the portion to be used, that is, the light source butting portion 22 and the light source end portion 23.

  According to this embodiment, an auxiliary for improving light unevenness due to a decrease in illuminance around the light source abutting portion 22 on the dot printing surfaces (inner surfaces) of the light guide plates 2 and 3 of the light guide display lighting fixture. New partial printing, that is, a partial printing having a substantially radial second pattern 20 whose printing area is substantially reduced as the distance from the light sources 8 and 9 increases, and is printed over the first pattern 19. Compared with the case where there is no similar printing, it is possible to improve the decrease in illuminance on the surfaces of the display panels 4 and 5. In this case, since the printing position of the light guide plates 2 and 3 is performed by the partial printing plate, even when the position of the light source butting portion 22 with respect to the light guide plates 2 and 3 is different, it can be easily handled.

  Further, the additional print shape on the light guide plates 2 and 3 in the vicinity of the light source end portion 23 is a print having a substantially radial third pattern in which the print area decreases as the distance from the light source increases. It is possible to improve light unevenness due to a decrease in illuminance in the display panels 4 and 5 of the end portion 23. In this case, by printing the pattern of FIG. 5 symmetrically, the shape of the partial printing plate to be manufactured can be reduced and shared with others.

  A second embodiment of the present invention will be described with reference to FIG. In this lighting apparatus, the light sources 8 and 9 are different in length in the first embodiment, and the light source 8 is long and the light source 9 is short. As described above, since the lengths of the light sources 8 and 9 are not uniform, the position of the light source butting portion 22 is different from that of the first embodiment. Others are the same as in the first embodiment. Also in this case, the second pattern 20 and the third pattern 21 can be printed on the light guide plates 2 and 3 using the same printing plate.

  In the present invention, printing of the first pattern 19, the second pattern 20, and the third pattern 21 is limited to the side opposite to the light guide surface 14 of the light guide plates 2 and 3, that is, the panel dot printing surface (inner surface). In addition, the same effect can be obtained by diffuse transmission also on the light guide surface 14, that is, on the display surface side (outer surface).

FIG. 3 is a perspective view of a lighting fixture in which the first pattern is represented only in the central portion of the light guide plate and the other portions are not shown in the state where the display panel of the first embodiment of the present invention is removed. It is a disassembled perspective view of the lighting fixture containing a display panel. It is a front view of the lighting fixture which shows the light-guide plate which printed the 2nd pattern and the 3rd pattern. (A) is a partial perspective view of the 1st and 2nd pattern of a light-guide plate, (b) is a front view of the lighting fixture which shows the light-guide plate which printed the 3rd pattern. It is a top view which shows the half of a 2nd pattern, or a 3rd pattern. It is a front view of the lighting fixture which shows the light-guide plate which printed the 2nd and 3rd pattern of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus body 2 Light guide plate 3 Light guide plate 4 Display panel 5 Display panel 8 Light source 9 Light source 13 Incident end surface 14 Light guide surface 19 1st pattern 20 2nd pattern 21 3rd pattern

Claims (1)

A light guide plate having an end surface as an incident surface on which light is incident and a surface as a light guide surface from which light is emitted, and a light guide plate that emits light incident from the incident surface from the light guide surface, and a line disposed on the end surface In a lighting fixture having a plurality of light sources arranged in a line,
Printing the first pattern for light diffusion in which the area ratio of the printed area increases as the distance from the light source increases on the light guide surface or the opposite surface;
A second pattern for light diffusion, in which the area ratio of the printed area decreases as the distance from the light source butting portion increases around the light source butting portion on the light guide surface or the opposite surface, is the second pattern. Is printed so that it is almost radial and spreads in a semi-circle ,
A third pattern is printed on the periphery of the light source end portion on the light guide surface or the opposite surface, and the area ratio of the printed area decreases as the distance from the light source end portion increases. luminaire, characterized in that equal to one of those approximately equally divided line perpendicular to the longitudinal direction of the light source the second pattern.

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