JPH11195321A - Circular fluorescent lighting unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular fluorescent lighting unit which has an infrared signal sensor which does not saturate easily. SOLUTION: A double-circular fluorescent lamp 20 prepared with a single metal cap 22 is loaded onto an under surface side of a lighting unit body 10. A sensor 30 accepting an infrared signal projected from the outside is loaded onto the under surface side of the lighting unit body 10. A light-transmissive cover 40 is set to cover the fluorescent lamp 20 and the sensor 30 from the downside. The sensor 30 is put in the position outside the ring of the fluorescent lamp 20 and close to the metal cap 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting an annular fluorescent lamp 20 on the lower surface of
A light receiving sensor 30 for receiving an infrared signal projected from the outside is mounted on the lower surface side of the light emitting device, and the annular fluorescent lamp 20 and a light transmitting cover 40 for covering the light receiving sensor 30 from below are disposed. Things.

[0002]

2. Description of the Related Art An annular fluorescent lamp having the above-described structure is known and widely used. The light from the annular fluorescent lamp enters the light receiving sensor, and an infrared signal enters. The distinction between them is made by selecting the infrared frequency of the infrared signal or its modulation frequency.

[0003]

When a large amount of light from the annular fluorescent lamp is incident on the light receiving sensor, light saturation occurs, the reception sensitivity to infrared signals is reduced, and this causes malfunction.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a ring-shaped fluorescent lamp device which is sensitive to an infrared signal in which light saturation of a light receiving sensor is reduced.

[0004]

According to the present invention, there is provided an instrument main body.
A double ring-shaped annular fluorescent lamp 20 having a single base 22 is mounted on the lower surface of the device body, and a light receiving sensor 30 for receiving an infrared signal projected from the outside is mounted on the lower surface of the device main body 10. It is assumed that a ring-shaped fluorescent lamp fixture having a structure in which a light-transmitting cover 40 that covers the heavy annular ring-shaped fluorescent lamp 20 and the light receiving sensor 30 from below is disposed. In the present invention,
The light receiving sensor 30 is connected to the double annular annular fluorescent lamp 20.
And a position close to the single base 22 shared by the double rings.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In the illustrated annular fluorescent lamp apparatus, a double annular annular fluorescent lamp 20 having a single base 22 is mounted on the lower surface side of the apparatus main body 10. Light receiving sensor 3 for receiving an infrared signal projected from the outside on the lower surface side of device main body 10
0 is attached. The translucent cover 40 that covers the double annular annular fluorescent lamp 20 and the light receiving sensor 30 from below is disposed.
In the present invention, the light receiving sensor 30 is arranged at a position outside the ring of the double ring-shaped annular fluorescent lamp 20 and close to the base 22. Reference numeral 11 denotes a fixture for detachably fixing the instrument body 10 to a ceiling rosette B of a ceiling A. Numeral 12 is a daring hole for attachment and detachment. The double annular annular fluorescent lamp 20 has a large annular tube and a small annular tube having slightly different diameters arranged concentrically and at the same height, connecting them so as to form a single discharge path, and having a single unit common to them. One base 22 is arranged. The base 22 has a wide-area structure having a larger area than that of a normal single annular fluorescent lamp. The present invention makes use of this wide area characteristic. In the present invention, the light receiving sensor 30 is arranged at a position outside the ring of the double ring-shaped annular fluorescent lamp 20 and close to the base 22. Thereby, the darkness formed in the vicinity of the base 22 having the wide area structure is effectively used. Light mainly perpendicular to this surface is emitted from the light emitting surface other than the base 22, but the amount of the light reaching the light receiving surface of the light receiving sensor 30 through the base 22 is small. By the way, if the light receiving sensor 30 is arranged at a position in the ring of the double annular annular fluorescent lamp 20, it is not good because the light coming almost perpendicularly from the light emitting surface near the furthest point reaches the light receiving sensor 30 directly. In addition, if the light receiving sensor 30 is disposed far from the base 22, light emitted from the light emitting surface near the base 22 easily enters the light receiving sensor 30, which is not good. Therefore, in practical use, it is advantageous to bring the lamp as close as possible to the double ring-shaped annular fluorescent lamp 20. However, the contact makes it difficult to attach or detach the double annular annular fluorescent lamp 20. Part of the light emitted from the double annular fluorescent lamp 20 and reflected by the light transmitting cover 40 reaches the light receiving sensor 30. However, the light receiving sensor 3
Since the base 22 near 0 has no light emission and does not form reflected light, the amount of light reaching the light receiving sensor 30 is reduced by that much. Referring to FIG. FIG. 3 is a drawing corresponding to FIG. 2 for a different embodiment. Also in this case, the light receiving sensor 30 is arranged at a position outside the ring of the double ring-shaped annular fluorescent lamp 20 and close to the base 22. However, there is another double annular annular fluorescent lamp 20 ′ which is concentric with the double annular annular fluorescent lamp 20 and is slightly larger than the double annular annular fluorescent lamp 20. In this case, the bases 22 are arranged, for example, on the left side, and the light receiving sensor 30 is arranged in a space between the base 22 and another base 22. In this way, the darkening effect of each base 22 is effectively used.

[0006]

According to the present invention, the light receiving sensor 30 is located outside the ring of the double ring-shaped annular fluorescent lamp 20 and the base 2 thereof.
The main feature is to dispose it at a position close to 2. According to this, it is possible to obtain an annular fluorescent lamp fixture having high sensitivity to an infrared signal in which light saturation of the light receiving sensor is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an annular fluorescent lamp apparatus according to the present invention.

FIG. 2 is a bottom view showing the device main body and the like.

FIG. 3 is a bottom view similar to FIG. 2 showing another embodiment.

[Explanation of symbols]

 10: Instrument body 20: Double annular annular fluorescent lamp 22: Base 30: Light receiving sensor 40: Translucent cover

Claims (1)

[Claims] 1. A double annular annular fluorescent lamp (20) having a single base (22) is mounted on the lower surface side of an instrument main body (10), and is projected from the outside onto the lower surface side of the instrument main body (10). A light-receiving sensor (30) for receiving the received infrared signal is mounted, and a light-transmitting cover (40) that covers the double annular annular fluorescent lamp (20) and the light-receiving sensor (30) from below is disposed. An annular fluorescent lamp device, wherein the sensor (30) is arranged at a position outside the ring of the double annular annular fluorescent lamp (20) and close to the base (22).