JPH0512887Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to an indoor fluorescent lamp with a dimming function that allows the brightness of the light from the fluorescent lamp to be changed steplessly while maintaining the full brightness state.

``Prior art'' In conventional fluorescent lamps, the dimmer device electrically controls the secondary current of the fluorescent lamp inverter by providing a changeover switch on the fluorescent lamp inverter or by separately installing a dimming control circuit. Depending on the situation, the light could be dimmed stepwise or steplessly.

Therefore, when dimming, that is, 50% of full brightness, 30%
%, there were problems in that it not only affected the blackening of the fluorescent lamp, but also increased wiring from the indoor fluorescent lamp, which affected other equipment due to noise.

The purpose of this invention is to provide a fluorescent lamp that eliminates the control circuit required for dimming, reduces the amount of wiring from the fluorescent lamp, and prevents the promotion of darkening of the fluorescent lamp.

"Means for Solving the Problem" According to this invention, a fluorescent lamp is held in a lamp body, a first polarizing film is provided covering the opposite side of the fluorescent lamp, and a plurality of polarizing films are formed from the inner surface of the lamp body. A boss is fixed to protrude, a first polarizing film is fixed to these protruding end faces, a globe made of a transparent material is attached to the lamp body to cover the fluorescent lamp, and one end of the support cylinder is attached to the center of the inner surface of the lamp body. A knob is rotatably attached to the supporting cylinder, protruding outward from the center hole of the globe, a transparent flange is attached to the knob facing the first polarizing film within the glove, and a first polarizing film is attached to the transparent flange. Two polarizing films are attached.

"Example" Figure 1 shows an example of this invention. A fluorescent lamp 12 is held in a lamp body 11. The first one covers the opposite side of the fluorescent lamp 12 from the lamp body 11.
A polarizing film 13 is provided. Fluorescent lamp 12
A plurality of bosses 14 are erected on the lamp body 11 on the outside thereof, and the first polarizing film 13 is stretched on the top surface of these bosses 14. A globe 15 is attached to the peripheral edge of the lamp body 11, covering the fluorescent lamp 12 and the first polarizing film 13.

The support cylinder 1 is located at the center of the inner surface of the lamp body 11.
One end of the knob 9 is fixedly erected and protrudes outward from the center hole of the globe 15 of the support cylinder 19.
6 is rotatably attached. A transparent flange 17 facing the first polarizing film 13 within the globe 15 is attached to the knob 16. A second polarizing film 18 is attached to the transparent flange 17.

The light from the fluorescent lamp 12 passes through the first polarizing film 1
3, only a specific polarization component is transmitted, and only the component in the polarization direction of the second polarizing film 18 in the light of the specific polarization component is transmitted through the second polarizing film 18. Therefore, when the polarization direction of the second polarization film 18 is perpendicular to the polarization direction of the first polarization film 13, the amount of light transmitted through the second polarization film 18 becomes zero. That is, by rotating the second polarizing film 18 using the knob 16, the amount of light passing through the second polarizing film 18 can be adjusted steplessly.

``Effects of the invention'' As mentioned above, according to this invention, the light is not dimmed by an electric circuit, so the conventional dimming control circuit is removed, and there is less wiring from the fluorescent lamp, which reduces the impact of noise on other equipment. It is possible to prevent the fluorescent lamp from accelerating darkening.

Further, according to this invention, both the first polarizing film and the second polarizing film can be securely attached,
Because the dimming characteristics are stable without shaking even when there is vibration,
It can also be configured as a dimming function for large fluorescent lamps. Furthermore, since the light leaking through the gaps between the plurality of bosses is radiated to the outside from the side surface of the globe 15, it is not completely dark, and it also functions as so-called indirect illumination.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention.

Claims (1)

[Claims for Utility Model Registration] A lamp body, a fluorescent lamp held in the lamp body, a first polarizing film provided to cover the opposite side of the fluorescent lamp to the lamp body, and an inner surface of the lamp body. a plurality of bosses fixed to protrude from the lamp body and having the first polarizing film fixed to the protruding end faces; a globe made of a transparent material and attached to the lamp body so as to cover the fluorescent lamp; and a center of the inner surface of the lamp body. a support cylinder having one end fixed to the support cylinder; a knob rotatably attached to the support cylinder and protruding outward from the center hole of the glove; and a knob facing the first polarizing film within the glove. A fluorescent lamp with a dimming function, comprising a transparent flange to which the above knob is attached, and a second polarizing film attached to the transparent flange.