JPS6340804Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clean room lighting fixture.

(Background Art) In the case of lighting equipment for clean rooms, the lighting equipment is sealed and mounted closely to the ceiling to prevent dust from entering the room. In particular, some lighting equipment perform maintenance and inspection from the back of the ceiling to prevent accumulated dust from falling into the room.

Figures 1 and 2 show a conventional example, in which a fixture body 3 is buried in an opening 2 provided in a ceiling 1, and a transparent panel 4 is provided to cover the open bottom surface of the fixture body 3, which can be opened and closed at the back of the fixture body 3. A back cover 5 is attached, and lighting parts such as a lamp 6 and a ballast 7 are attached to this back cover 5. A cover sheet 8 that can be opened and closed is provided inside the instrument main body 3 and covers the upper surface of the transparent panel 4. This cover sheet 8 is connected to the back cover 5 with a string 11 via each pulley 9, 10. The cover sheet 8 opens and closes in conjunction with the opening and closing operations of the cover sheet 5.

In this way, during maintenance and inspection, the back cover 5 can be opened from the ceiling and the lamp 6 attached to the back cover 5 can be opened.
Exchange etc. At this time, when the back cover 5 is opened, the string 11 with one end attached to the back cover 5 is pulled, and the pulleys 9 and 1 are pulled.
The cover sheet 8 covers the upper surface of the light-transmitting panel 4 through the cover sheet 8 and receives dust entering through the open back door 12 of the back cover 5.

However, in this case, dust sometimes entered through the gap 13 between the device body 3 and the covering sheet 8 and fell onto the transparent panel 4. Further, when the back cover 5 was closed, dust sometimes fell onto the transparent panel 4 from the cover sheet 8 that was wound up.

(Purpose of the invention) The present invention has been made in view of the above points, and its purpose is to prevent dust from falling onto the transparent panel during maintenance and inspection.

(Embodiment) Figures 3 and 4 show an embodiment of the present invention, which is a lighting fixture for a clean room, in which a fixture main body 3 is buried in an opening 2 provided in a ceiling 1, and the open lower surface is covered and transparent. In addition to providing a light panel 4, a back cover 5 that can be opened and closed is attached to the back of the instrument main body 3, and lighting parts such as a lamp 6 and a ballast 7 are attached to the back cover 5. The appliance main body 3 is generally box-shaped with an open bottom surface and a back door 12 on the top surface, and is attached to the ceiling 1 in close contact with a flange 14 provided on the open bottom surface via a gasket 15. A light-transmitting panel 4 is placed on a mounting frame 16 to cover the open lower surface, and is attached to the instrument main body 3 by a hook spring 18, and is attached to the collar 14 in close contact with the seal 17. A back cover 5 is attached to the back door 12 on the top surface so that it can be rotated by a hinge 19 and can be freely opened and closed, and lighting components such as a lamp 6 and a ballast 7 are attached to the inner surface of the back cover 5. Inside the device body 3 is a winding drum 2 with a built-in spring on one side above the translucent panel 4.
0, a pulley 9 is provided on the other side, and the cover sheet 8 is wound around the winding drum 20 while being biased by a spring. This covering sheet 8 is attached to the back cover 5 by a string 11 passing through pulleys 9 and 10.
is connected to. A reflective plate 21 is provided along the side of the instrument main body 3 below the winding drum 20 and pulley 9.
is installed. The upper end of the reflecting plate 21 is located inward from the winding drum 20 and the pulley 9, and the lower end faces the mounting frame 16.

In this way, during maintenance and inspection, the back cover 5 is opened from the ceiling and the lamp 6 attached to the back cover 5 is opened.
exchange etc. At this time, when you open the back cover 5, the back cover 5
A string 11 with one end attached to the pulley 9 is pulled.
The covering sheet 8 is pulled out from the winding drum 20 via the winding drum 20, and the covering sheet 8 covers the upper surface of the transparent panel 4, and receives dust that enters through the open back door 12 of the back cover 5. In this state, dust that enters through the gap 13 between the covering sheet 8 and the side surface of the instrument main body 3 falls behind the reflecting plate 21 and is deposited on the mounting frame 16. When the back cover 5 is closed after maintenance and inspection, the cover sheet 8 is wound onto the winding drum 20 by the spring of the winding drum 20. At this time, dust on the covering sheet 8 falls from the vicinity of the winding drum 20 as it is wound, but this dust also falls on the reflection plate 2.
It falls behind 1.

(Effects of the invention) The present invention is constructed as described above, with the main body of the device buried in the opening in the ceiling, a light-transmitting panel covering the open bottom surface, and a back cover that can be freely opened and closed on the back of the main body of the device. , various lighting parts are attached to this back cover, and a cover sheet is provided inside the instrument body that covers the top surface of the translucent panel and opens and closes in conjunction with the opening/closing operation of the back cover, and the gap between both ends of the cover sheet is A reflector plate is provided along the side wall of the appliance body corresponding to For example, a string with one end attached to the back cover is pulled and the cover sheet is pulled out from the take-up drum via a pulley, and the cover sheet covers the top surface of the transparent panel in conjunction with the opening and closing operations of the back cover. It catches dust entering through the back door with the back cover open. In this state, dust that enters through the gap between both ends of the covering sheet and the side of the device body falls behind the reflector and lands on the mounting frame.
Also, when the back cover is closed after maintenance and inspection, the cover sheet is opened by being wound up by the spring of the winding drum, and as the cover sheet is opened, dust on the cover sheet falls, but this dust also falls behind the reflector. This prevents dust from falling onto the translucent panel. Also, since a reflector is provided, lighting efficiency is also good.

[Brief explanation of the drawing]

1 and 2 show a conventional example, with FIG. 1 being a cross-sectional front view with the back cover closed, and FIG. 2 being a cross-sectional front view with the back cover open. 3 and 4 show an embodiment of the present invention, FIG. 3 being a sectional front view with the back cover open, and FIG. 4 being a perspective view of the same. 1... Ceiling, 2... Opening, 3... Appliance body, 4
...Transparent panel, 5...Back cover, 6...Lamp, 7
... Stabilizer, 8 ... Covering sheet, 9, 10 ... Pulley, 11 ... String, 12 ... Back door, 13 ... Gap,
14... Tsuba, 15, 17... Patsukin, 16...
Mounting frame, 18... Hanging spring, 19... Hinge, 2
0... Winding drum, 21... Reflection plate.

Claims (1)

[Scope of utility model registration request] The main body of the device is buried in an opening in the ceiling, a transparent panel is provided to cover the open bottom surface, and a back cover that can be opened and closed is attached to the back of the main body of the device. Various lighting parts are attached to this back cover, and the main body of the device is installed. A covering sheet is provided within the device that covers the top surface of the translucent panel and opens and closes in conjunction with the opening and closing operations of the back cover, and reflective plates are provided along the side walls of the instrument body corresponding to the gaps at both ends of the covering sheet. A lighting fixture for a clean room, characterized in that the lower end of the reflector is opposed to a mounting frame on which the translucent panel is mounted.