Illumination – Revolving
Patent
1986-03-27
1988-03-22
Jones, Larry
Illumination
Revolving
362253, 362458, 362296, F21V 704
Patent
active
047333324
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an illuminating device, and more particularly to an illuminating device which is useful for illuminating show windows and showcases and for use as an advertising sign lamp.
BACKGROUND ART
Fluorescent lamps have heretofore been used most widely as illuminating devices. As compared with incandescent lamps, fluorescent lamps generate a considerably lesser amount of heat but nevertheless release a fairly large amount of heat, so that they are not suited to use in a low-temperature atmosphere, for example, in freezing or refrigerating showcases. They have another drawback in that when installed and used at locations exposed to rain as is the case with advertising sign lamps or in places subject to the influence of water as in refrigerating showcases for fresh fish, the lamp is liable to develop electrical troubles such as electrical insulation failure and improper illumination. Further when the fluorescent lamp is installed and used in a show window or showcase, there is the likelihood that a light blocking member such as lampshade will be needed to shield the eyes of the customer from the illuminating light, which is inconvenient.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an illuminating device which does not generate any heat and which is suited to installation and use in low-temperature atmospheres as in freezing or refrigerating showcases.
Another object of the present invention is to provide an illuminating device which is almost free of the adverse influence of rainwater or water vapor and which is suited to installation in locations exposed to rain as in the case of advertising sign lamps or in places prone to the influence of water as in refrigerating showcases for fresh fish.
Still another object of the present invention is to provide an illuminating device which emits light as directed in a specified direction and which therefore does not require the provision of a lampshade or like light blocking member.
Other features of the present invention will become apparent from the following description.
The present invention provides an illuminating device which is characterized in that the device comprises a light-transmitting rod for transmitting the light incident on one end thereof toward the other end, a diffusion pattern formed on the outer peripheral surface of the rod by adhering a fine powder of high refractive index in the shape of a line extending continuously or discretely axially of the rod, and a transparent protective tube covering the peripheral surface of the rod with a circumferential clearance formed between the rod and the tube, the clearance between the rod and the protective tube being sealed off at opposite ends thereof.
The light-transmitting rod for the illuminating device of the present invention is not limited particularly insofar as it is capable of transmitting light therethrough. Examples of suitable rods are a quartz glass rod (refractive index: 1.46), optical glass rod (refractive index: 1.5 to 1.7), silicone resin rod (refractive index: 1.41) and the like. These rods have a high transparency and involve reduced transmission losses, while they are resistant to light and therefore retain the desired quality and properties over a prolonged period of time. The rod must be solid and circular in cross section. The axis of the rod may be straight or curved. The diameter of the rod is suitably determined according to the amount of light to be transmitted, the length of the illuminating line, etc. For example, it is suitably determined from within the range of about 3 to 30 mm, more advantageously within the range of about 5 to 20 mm. If the diameter is smaller than 3 mm, a sufficient light receiving area will not be available at the incidence end, and a sufficient amount of light will not be obtained. On the other hand, even if the diameter exceeds 30 mm, it is impossible to expect improvements in quality and performance in corresponding relation to the increased cost. Thus, the smaller or larg
REFERENCES:
patent: 4195907 (1980-04-01), Zamja et al.
patent: 4245282 (1981-01-01), Sokol
patent: 4382272 (1983-05-01), Quella et al.
patent: 4562832 (1986-01-01), Wilder et al.
patent: 4637686 (1987-01-01), Iwamoto et al.
Fujii Kanenaga
Hayakawa Junji
Koizumi Shun
Komiyama Toru
Yamashita Hiroshi
Agency of Industrial Science and Technology
Daikin Industries Ltd.
Jones Larry
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