JPH056761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reflector in the form of a grid used as a light control body for a lighting equipment equipped with a straight tube fluorescent lamp.

[Conventional technology]

Recently, display devices such as cathode ray tubes are being used more and more frequently as offices become more office-accessible.
Accordingly, lighting devices equipped with straight tube fluorescent lamps that are installed on the ceiling of offices, etc. are designed to prevent reflections of the lamps on the display surface of the display equipment. To prevent direct light from entering and reflecting directly on the display surface of the display equipment, and to prevent direct light from entering the eyes of users of office equipment to prevent glare, and to ensure that the necessary work surface illuminance is Increasingly, functions such as ensuring safety are required.

In order to meet these demands, the lighting device
As shown in FIG. 9 and FIG. 9, a reflector 2 in a lattice shape is arranged below a lighting fixture 1. In these figures, 1a is a straight tube fluorescent lamp, 1b is a reflective umbrella, 1c is a cover frame, and 1d in FIG. 10 is a lamp socket. and,
The structure of the conventional grating reflector 2 is shown in FIGS. 9 to 13.
As shown in the figure.

That is, the conventional reflector 2 consists of a reflective frame 3 whose inner surface is a reflective surface, and a grid body 4 attached within the reflective frame 3. The lattice body 4 is a horizontal lattice member 5 having a substantially V-shaped cross section and whose outer surface is a reflective surface.
It is formed by intersecting a large number of vertical lattice members 6, each of which has a substantially V-shaped cross section and whose outer surface is also a reflective surface. The horizontal lattice member 5 is arranged parallel to the tube axis direction of the straight tube type fluorescent lamp 1a, and the vertical lattice member 6 is arranged along a direction substantially perpendicular to the tube axis of the lamp 1a. .

These vertical and horizontal grids 5 and 6 are connected by a cutout groove 5a cut from the lower end of the horizontal grid member 5 (see FIGS. 12 and 13) and a cutout groove cut from the upper end of the vertical grid member 6 (see FIGS. 12 and 13). (not shown) are engaged in a complicated manner. Due to this connection, the lower ends of the vertical and horizontal grid members 5 and 6 are provided at the same height position as shown in FIGS. 9 to 13.

This reflector 2 can block the direct light from the lamp 1a from directly entering the display surface and the operator's eyes by its vertical and horizontal grid members 5 and 6, and can also block the direct light from the display surface and the operator's eyes. Reflection from the inner surface of the reflective frame 4 and the outer surface of the vertical and horizontal grid members 5 and 6 makes it possible to control the light distribution so that the reflected light does not directly enter the display surface or the operator's eyes. As a result, the necessary work surface illuminance can be obtained.

[Problem that the invention seeks to solve]

However, in the conventional reflector 2 as described above, the light shielding θ1 (see FIG. 9) by the horizontal grating member 5,
The shading angle θ2 (see Fig. 10) by the vertical lattice member 6 is
The difference is large because the lower ends of these lattice members 5 and 6 are provided at the same height position. If there is a large difference between the light shielding angles .theta.1 and .theta.2, there is a problem that there is a high possibility that the lamp 1a will be reflected on the display surface. Note that the shading angle θ1,
In order to bring θ2 closer, the pitch of the vertical lattice members 6 disposed along the direction substantially perpendicular to the tube axis direction of the lamp 1a is greatly reduced. This is possible by increasing each light shielding angle θ2, but in that case, the lattice shape becomes elongated in a direction substantially perpendicular to the tube axis direction of the lamp 1a, which is preferable in terms of the appearance of the reflector 2. Of course, this is not practical, as there is a problem that the number of vertical lattice members 6 used increases, resulting in higher costs. In addition, since the lower ends of the vertical and horizontal lattice members 5 and 6 are provided at the same height position as described above, the cut end surfaces of the notched grooves 5a are aligned with the vertical lattice members as shown in FIGS. 12 and 13. It separates from the outer surface of the bent end of No. 6. Therefore, the cut end face is visible and does not look good, and the light incident on the back side of the horizontal lattice member 5 from the lamp 1a leaks through the cut end face as shown by the arrow in FIG. There was a problem that uncontrolled leaked light could be reflected on the display surface.

[Means for solving problems]

The present invention also provides a horizontal lattice member that forms a lattice body installed in a reflective frame disposed below a straight tube fluorescent lamp, and that is provided along the tube axis direction of the lamp. forming a lattice, and
In relation to the vertical lattice member provided along the direction substantially perpendicular to the tube axis direction of the lamp,
The above conventional problems are solved by providing the lower ends of the vertical lattice members below the lower ends of the horizontal lattice members.

[Effect]

In the reflector equipped with the above solution, the lower end of the vertical lattice member is lower than the lower end of the horizontal lattice member, so that the light shielding angle by the vertical lattice member can be increased without significantly reducing the distance between the vertical lattice members. Therefore, the angle can be approximated to the light shielding angle of the horizontal lattice member. Moreover, as mentioned above, since the lower end of the vertical lattice member is lower than the lower end of the horizontal lattice member, the entire end surface of the horizontal lattice member at the intersection of the vertical and horizontal lattice members is covered at the lower end of the vertical lattice member. can be covered up.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 8.

Reference numeral 11 in FIGS. 1 and 2 is a lighting fixture attached to the ceiling 12. For example, two straight tube fluorescent lamps 1 are connected to the interior of a chassis 13 with an opening at the bottom of this device 1 through lamp sockets 14.
5 are mounted in parallel, and two reflective shades 16 which specifically cover these lamps 15 from above.
are stored respectively, and the lamps 15
A lighting unit 17 is housed therein. In addition, 18 in FIGS. 1 and 2 is a cover frame included in the lighting fixture 11, which is removably attached to the chassis 13 by a mounting means (not shown), and also covers the fixture mounting hole 12a in the ceiling 12. It is arranged as follows.

Inside the lighting fixture 11, a lattice-shaped reflector 19 supported by the inner peripheral edge of the cover frame 18 is arranged below the lamp 15. This reflector 1
9 is a reflective frame 20 as shown in FIGS. 1 to 8.
and a grid body 2 installed inside the first reflective frame 20.
Consists of 1.

The reflective frame 20 is formed by assembling rectangular frame plates 22 to 25 made of metal or resin on the front, rear, left and right sides, which are mirror-finished so that the inner surfaces thereof form reflective surfaces. As shown in FIGS. 4 and 8, in this embodiment, each of the frame plates 22 to 25 is made of stainless steel, and claws 26 are provided at both ends of the front and rear frame plates 22 and 23, respectively.
are inserted into the slit-shaped through holes provided at both ends of the left and right frame plates 24, 25, respectively, and then bent to connect the front, rear, left, and right frame plates 22 to 25. By inserting and engaging the L-shaped corner members 27 extending between the ends of the lower bent edges 22a to 25a, which are bent outward at the lower ends of the 25, to the adjacent lower bent edges 22a to 25a, respectively. In this case, the assembled reflective frame 20 is shown. In addition, the lower bent edges 22a to 25a
is placed on the inner peripheral edge of the cover frame 18.

The lattice body 21 includes a horizontal lattice member 28 having a substantially V-shaped cross section and mirror-finished so that the outer surface forms a reflective surface.
Similarly, it is formed by intersecting a large number of vertical lattice members 29 having a substantially V-shaped cross section and mirror-finished outer surfaces so as to form reflective surfaces in substantially perpendicular directions.

These vertical and horizontal lattice members 28, 29 are connected by notched grooves 30 cut from the lower end of the horizontal lattice member 28 and notched grooves 31 cut from the upper end of the vertical lattice member 29, as shown in FIGS. 4 and 7. At the same time, the locking piece 32 formed at the upper end of the notch groove 31 is
This is accomplished by engaging a pair of locking holes 33 formed in the horizontal lattice member 28 upwardly from the notch groove 30 thereof. The vertical and horizontal lattice members 28 and 29 are connected while elastically deforming the vertical lattice members 29 so as to narrow them. Due to the guiding action, the narrowed vertical lattice members 29 are naturally expanded as the connection progresses, and the connection is completed.

Then, the lattice body 2 connected in the above manner
The lower end of one vertical lattice member 29 is provided below the lower end of the horizontal lattice member 28. In order to do this, as shown in FIG.
I am using a larger one. In addition, by assembling by the above connection, each of the vertical and horizontal lattice members 28, 2
9 are placed at approximately the same height.

Further, in the lattice body 21 having the above configuration, the horizontal lattice members 28 are arranged parallel to the tube axis direction of the straight tube fluorescent lamp 15, and the vertical lattice members 29 are arranged approximately parallel to the tube axis of the lamp 1a. The reflective frame 20 is mounted within the reflective frame 20 so as to be arranged along a direction intersecting at right angles. Note that in this embodiment, the reflective frame 2
The installation of the lattice body 21 to the vertical and horizontal lattice members 2
The claws 34 provided at both ends of the frames 8 and 29 are inserted into the slit-like holes provided in the front, rear, left, and right frame plates 22 to 25, respectively, and then bent.
This is done by connecting 2 to 25.
Furthermore, the reflective surfaces of the front and rear frame plates 22 and 23 of the lattice body 21 and the reflective surface of the horizontal lattice member 29 opposing thereto are both formed of a part of a paraboloid whose focal point is the position of the lamp 15, Moreover, as shown in FIG. 1, the light from the lamp 15 is reflected at an angle equal to each θ3 of the horizontal lattice member 29. Along with this, the left and right frame plates 24 of the lattice body 21,
The reflective surface of 25 and the reflective surface of the vertical lattice member 29 are also
Each of them is formed of a part of a paraboloid whose focal point is the position of the lamp 15, and moreover, as shown in FIG. It is designed to do so.

When the straight tube fluorescent lamp 15 of the lighting device consisting of the reflector 19 and the lighting fixture 11 configured as described above is turned on, some of the light emitted along the direction perpendicular to the tube axis direction of the lamp 15 is reflected. The light that is blocked by the reflective surfaces of the frame 20 and the horizontal lattice member 28 is controlled and reflected at approximately constant angles, as represented by the arrows in FIG. 1, respectively. The light shielding by the horizontal lattice members 28 is indicated by θ3 in FIG. Also, among the light emitted along the tube axis direction of the lamp 15, the light that is blocked by each reflective surface of the reflective frame 20 and the vertical lattice member 29 is represented by the arrows in FIG. It is controlled and reflected at a substantially constant angle. Incidentally, the light shielding angle by the vertical lattice member 29 is indicated by θ4 in FIG.

By the way, the reflector 19 has its vertical lattice member 29
Since the lower ends of the horizontal lattice members 28 are lower than the lower ends of the horizontal lattice members 28 (conversely speaking, the lower ends of the horizontal lattice members 28 are raised higher than the lower ends of the vertical lattice members 29), the pitch between the vertical lattice members 29 is The light shielding angle θ4 of the vertical lattice member 2) can be increased without significantly reducing the lattice shape (that is, without impairing the substantially square lattice shape of the lattice body 21). This results in
The shading angle θ4 can be approximated to the shading angle θ3 of the horizontal lattice member 28. As an auxiliary means to approximate or make the shielding angles θ3 and θ4 the same, the pitch of the vertical lattice members 29 may be slightly narrowed or There is no problem in adjusting the lower end position of each grid member 28, 29.

Moreover, as described above, since the lower end of the vertical lattice member 29 is lower than the lower end of the horizontal lattice member 28, the vertical lattice member 29 is lower than the lower end of the horizontal lattice member 28, so that At the lower end of the grid member 29, the horizontal grid member 28 at the intersection of the vertical and horizontal grid members 28
The entire cut end face of the notched groove 30 can be covered and hidden. Therefore, since the cut end face is prevented from being visually recognized, the appearance can be improved, and the light incident on the back side of the horizontal lattice member 28 from the lamp 15 is prevented from leaking through the cut end face. This can be prevented with the grid member 29.

Although the above-mentioned embodiment is constructed as described above, in carrying out the present invention, the specific structures of the reflective frame, the vertical and horizontal grid members of the grid body, etc. Of course, the shape, position, etc. are not limited to the one embodiment described above, and can be configured and implemented in various ways.

〔Effect of the invention〕

According to the present invention, the gist of which is the structure described in the above claims, the shading angle of the vertical lattice members and the shading angle of the horizontal lattice members are approximated without significantly reducing the pitch between the vertical lattice members. At the same time, it eliminates exposure and visibility of the cut end faces of the horizontal lattice members at the intersections of the vertical and horizontal lattice members,
This has the effect of improving the appearance and preventing light from leaking from the intersection.

[Brief explanation of drawings]

1 to 8 show an embodiment of the present invention,
Fig. 1 is a schematic vertical side view of the illumination device, Fig. 2 is a sectional view of a part of the illumination device taken along the line - in Fig. 1, Fig. 3 is a perspective view of the grid, and Fig. 4 5 is an exploded perspective view of the lattice body, FIG. 5 is a perspective view of the intersection of the vertical and horizontal lattice members, FIG. 6 is a sectional view taken along the line - in FIG. 5, and FIG. 7 is a part of each of the vertical and horizontal lattice members. FIG. 8 is a perspective view of a part of the grid body. 9 to 13 show conventional examples, FIG. 9 is a schematic longitudinal side view of the lighting device, FIG. 10 is a sectional view showing a part of the lighting device along the line - in FIG. 11 is a perspective view of a part of the lattice body, FIG. 12 is a perspective view of an intersection of vertical and horizontal lattice members, and FIG. 13 is a sectional view taken along the line - in FIG. 12. 15... Straight tube fluorescent lamp, 19... Reflector, 20... Reflection frame, 21... Grid body, 28...
Horizontal lattice member, 29...vertical lattice member.

Claims (1)

[Scope of Claims] 1. A reflective frame disposed below the straight fluorescent lamp and having an inner surface as a reflective surface, and a tube shaft of the straight fluorescent lamp installed within the reflective frame. A horizontal lattice member having a substantially V-shaped cross section, which is arranged parallel to the direction and whose outer surface is a reflective surface, is arranged along a direction substantially perpendicular to the tube axis direction of the straight fluorescent lamp. , and a lattice body formed by intersecting vertical lattice members having a substantially V-shaped cross section whose outer surfaces are reflective surfaces, wherein the lower end of the vertical lattice member is connected to the horizontal lattice. A reflector for a lighting device, characterized in that the reflector is provided below the lower end of the member.