JP2001076673A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain luminous efficiency in a high-temperature atmosphere and to secure rising characteristic of light flux. SOLUTION: A plurality of bulb parts 22 are disposed parallel and these bulb parts 22 are made to communicate with each other by connecting them by a bridge part 23 on the tip end side thereof, thus forming a bulb 21. A phosphor 32 is formed on an inner surface of the bulb 21, excluding a tip-end side inner surface portion thereof. Electrodes 26 are sealed in both lateral ends of the bulb 21 on the base end side thereof, while thin tubes 30 communicating with the interior of the bulb 21 are provided on the base end side of the bulb 21. In order to secure the rising characteristic of light flux, a tip-end side amalgam 33 is fast stuck to the tip-end side inner surface portion of the bulb 21, where no phosphor is formed. In order to maintain luminous efficiency in a high-temperature atmosphere, thin-tube side amalgam 34 is sealed in the thin tubes on the base end side of the bulb 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fluorescent lamp having amalgam for controlling mercury vapor pressure.

[0002]

2. Description of the Related Art Conventionally, fluorescent lamps include an H-shaped arc tube and a single-lamp type fluorescent lamp having a base attached to the base end of the arc tube.

[0003] The luminous tube of this fluorescent lamp comprises a bulb having a pair of bulb parts arranged in parallel and a bridge part for connecting the distal ends of these bulb parts to each other and communicating with each other. Are formed, a rare gas containing mercury is sealed in the bulb, and electrodes are sealed at both ends of the bulb, that is, at the base end side of each bulb.

By the way, in lighting equipment using such a fluorescent lamp, downsizing has progressed, and when the fluorescent lamp is turned on in the lighting equipment, the ambient temperature of the fluorescent lamp tends to be high. However, in such a high temperature atmosphere,
The mercury vapor pressure in the bulb rises from an appropriate range, the luminous flux decreases, and the luminous efficiency decreases.

[0005] Therefore, in order to improve the luminous efficiency in a high-temperature atmosphere, the position of the bridge portion on the distal end side of the bulb is shifted to the electrode side, which is the proximal end side, so that the coolest portion is secured on the distal end side of the bulb. Also, amalgam is sealed in a narrow tube communicating with the inside of the valve at the base end side of the valve portion.

[0006]

However, by shifting the position of the bridge portion to the electrode side which is the base end side, it is possible to cope with a higher temperature atmosphere when the coldest portion is secured at the tip end side of the bulb. The more the bridge portion needs to be shifted to the electrode side, the shorter the discharge path length, and there is a problem that the luminous efficiency is reduced in proportion thereto.

[0007] When encapsulating amalgam in a thin tube,
In order to cope with higher temperature atmospheres, amalgam with lower mercury vapor pressure is required.In this case, at a low temperature at the beginning of lighting, the diffusion of mercury from the thin tube is slow, so the rising of the luminous flux Has the problem of becoming slower.

An object of the present invention is to provide a fluorescent lamp which can maintain the luminous efficiency in a high-temperature atmosphere and secure the rising characteristics of a luminous flux.

[0009]

According to a first aspect of the present invention, there is provided a fluorescent lamp comprising: a plurality of bulb portions arranged in parallel; a bulb having a bridge portion for connecting the distal ends of the bulb portions to each other for communication; A phosphor formed on the inner surface of the bulb except for the distal end of the bulb; electrodes sealed at both ends on the proximal end of the bulb; and a distal end secured to the inner face of the bulb where the phosphor is not formed. And amalgam.

[0010] In this configuration, the tip-side amalgam is fixed to the inner surface of the bulb on the tip side, so that the tip-side amalgam is positioned in the discharge path in the bulb to maintain the luminous efficiency in a high-temperature atmosphere and to maintain the light flux. To secure the rising characteristics. Further, since the tip side amalgam is fixed to the inner surface of the bulb where the phosphor is not formed, the phosphor is not interposed, and the tip side amalgam is securely fixed to the bulb.

According to a second aspect of the present invention, in the fluorescent lamp according to the first aspect, the amalgam on the tip side is welded to the inner surface on the tip side of the bulb.

In this configuration, since the amalgam at the distal end is welded to the inner surface at the distal end of the valve, for example, the distal end of the valve is heated and melted from the outside to facilitate the fixing of the amalgam at the distal end to the valve. .

According to a third aspect of the present invention, there is provided the fluorescent lamp according to the first or second aspect, further comprising a thin tube communicating with the inside of the bulb at a base end side of the bulb, and a narrow tube-side amalgam is sealed in the thin tube. Things.

In this configuration, since the amalgam on the capillary side is sealed in the capillary on the proximal end side of the bulb, the rising properties of the luminous flux are ensured by the amalgam on the distal end, and the luminous efficiency in a high-temperature atmosphere is ensured by the amalgam on the capillary side. maintain.

According to a fourth aspect of the present invention, in the fluorescent lamp according to the third aspect, the amalgam on the capillary side has a higher mercury vapor pressure control ability than the amalgam on the tip side.

In this configuration, since the mercury vapor pressure control ability of the capillary amalgam is higher than that of the amalgam at the distal end, the rising characteristics of the luminous flux by the amalgam at the distal end are ensured and the luminous efficiency of the amalgam at the high temperature in the high temperature atmosphere is ensured. Ensure maintenance.

According to a fifth aspect of the present invention, there is provided the fluorescent lamp according to the third aspect, wherein the amalgam on the capillary side has a lower mercury vapor pressure control ability than the amalgam on the tip side.

In this configuration, since the mercury vapor pressure control capability of the amalgam on the capillary side is lower than that on the amalgam on the distal side, the rising characteristics of the light flux by the amalgam on the distal side are assisted by the amalgam on the capillary side during lighting.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a cross section of a bulb portion of a fluorescent lamp, FIG. 2 is an end view showing a front end side of the fluorescent lamp, and FIG. 3 is a rise characteristic diagram of a light beam.

The fluorescent lamp (single cap fluorescent lamp) has a light emitting tube 11 and a base 12 fixed to the base end of the light emitting tube 11.

The arc tube 11 has a light-transmitting glass bulb 21. The bulb 21 has a pair of cylindrical, straight tube-shaped bulb portions 22 arranged in parallel. In the vicinity of the distal end side of the portion 22, there is a bridge portion 23 for connecting and communicating the two valve portions 22 with each other, and is formed in an H shape by the pair of valve portions 22 and the bridge portion 23. Discharge path 24 is formed. The distal end side of each valve part 22 is closed by an end face part 25, and the base end side of each valve part 22 is closed by closing an electrode 26. The end face 25 of the valve section 22 is the coldest section of the valve 21.

The base end of each valve section 22, ie, the valve 21
Each of the electrodes 26 sealed at both ends has a filament 29 supported by a pair of wells 28 with respect to a flare stem 27, and is provided at a proximal end of the bulb portion 22 through the flare stem 27. Welded. At the end face of the flare stem 27, a thin tube 30 which also serves as an exhaust pipe which is sealed after exhausting the inside of the valve 21 and enclosing a rare gas such as argon is projected, and the wells 28 are electrically connected to each other. Are connected to a pair of wires (not shown).

On the inner surface of the bulb 21, for example, a phosphor 32 such as a three-wavelength phosphor or a halophosphate phosphor is applied and formed. However, the phosphor 32 is not formed on the end face 25 of each bulb 22.

A tip amalgam 33 is fixed to the inner surface (coldest part) of the end face 25 on the tip side of one of the valve portions 22, and a thin tube side amalgam 34 is sealed in the thin tube 30 of the one valve portion 22. ing. The tip side amalgam 33 and the narrow tube side amalgam 34 are for appropriately controlling the mercury vapor pressure in the valve 21 and include bismuth (Bi) and indium (I).
n), tin (Sn), lead (Pb), zinc (Zm), and the like, and is formed in a substantially spherical shape by an alloy.
The mercury vapor pressure control capability of the capillary amalgam 34 is higher than that of the tip amalgam 33, that is, the mercury vapor pressure is lower so that the mercury vapor absorption in a high-temperature atmosphere is better. And in this embodiment, the tip side amalgam
In the state where a predetermined amount of mercury is compounded only into the small tube-side amalgam 34 as a mercury supply source without merging mercury into 33, the tip side amalgam 33 and the small tube-side amalgam 34 are connected to the valve 21.
The mercury released into the bulb 21 from the capillary-side amalgam 34 is also absorbed by the tip-side amalgam 33 when the lamp is turned off after lighting.

The tip side amalgam 33 is heated by melting the end face portion 25 of the valve portion 22 from the outside, and melted by heating the end face portion.
Welded to 25.

The base 12 is, for example, a GY10q type for a compact fluorescent lamp, and has a base body 41 and four pins 42 protruding from an end face of the base body 41.

Then, as in this embodiment, the valve
By fixing the tip-side amalgam 33 to the inner surface of the tip side of the tip 21, the tip-side amalgam 33 can be positioned in the discharge path 24 in the bulb 21. Compared to side amalgam 34,
The mercury is quickly released and diffused from the tip side amalgam 33 into the bulb 21, and as shown in FIG. 3, the luminous flux characteristics A when the tip side amalgam 33 and the capillary side amalgam 34 are provided include the tip side amalgam 33. The rise of the luminous flux can be made faster than the luminous flux characteristic B in the case where only the amalgam 34 is used.

Further, if the ambient temperature of the fluorescent lamp becomes high after the fluorescent lamp is turned on, the mercury vapor pressure can be properly maintained in the narrow tube side amalgam 34, and the luminous efficiency in the high temperature atmosphere can be maintained.

Further, by increasing the mercury vapor pressure control capability of the thin-tube amalgam 34 compared with the high-end amalgam 33, the light-emitting efficiency of the thin-tube amalgam 34 in a high-temperature atmosphere can be ensured while maintaining the rising characteristics of the luminous flux. Can be reliably maintained.

Further, since the tip side amalgam 33 is fixed to the inner surface of the end face portion 25 of the bulb portion 22 where the phosphor 32 is not formed, the tip side amalgam 33 is attached without the phosphor 32 interposed therebetween. 22 can be securely fixed to the inner surface of the end face portion 25, and the influence of the shadow of the tip side amalgam 33 can be reduced.

Further, since the tip side amalgam 33 is welded to the inner surface of the end face 25 of the valve section 22, the end face 25 of the valve section 22 is formed.
Is heated and melted from the outside, so that the tip side amalgam 33 can be easily fixed to the inner surface of the end face 25 of the valve section 22.

The ability to control the mercury vapor pressure of the capillary amalgam 34 may be lower than that of the distal amalgam 33. In this case, the rising characteristics of the luminous flux by the distal amalgam 33 can be assisted by the capillary amalgam 34 during lighting.

Further, as shown in FIG. 4, only the tip side amalgam 33 may be arranged in the valve 21. In this case, in a state where a predetermined amount of mercury is combined with the tip side amalgam 33 to serve as a mercury supply source, the tip side amalgam 33 is arranged inside the bulb 21.

Also in this case, the rising characteristics of the luminous flux can be ensured by the tip amalgam 33 located in the discharge path in the bulb 21, and the high temperature atmosphere can be secured by the tip amalgam 33 located in the coolest part of the bulb 21. The luminous efficiency of the device can be maintained.

[0036]

According to the first aspect of the present invention, the amalgam at the distal end is fixed to the inner surface at the distal end of the bulb, so that the amalgam at the distal end can be located in the discharge path in the bulb. The luminous efficiency in the atmosphere can be maintained, and the rising characteristics of the luminous flux can be secured. Moreover, by fixing the amalgam on the distal end to the inner surface of the bulb where the phosphor is not formed, the amalgam on the distal end can be securely adhered to the bulb without the intervening phosphor.

According to the fluorescent lamp of the second aspect, in addition to the effect of the fluorescent lamp of the first aspect, since the amalgam on the distal end is welded to the inner surface of the distal end of the bulb, for example, the distal end of the bulb is heated from the outside. Then, the tip side amalgam can be easily fixed to the valve.

According to the fluorescent lamp of the third aspect, in addition to the effect of the fluorescent lamp of the first or second aspect, the amalgam on the small tube side is sealed in the small tube on the base end side of the bulb.
With the amalgam at the tip end, the rising characteristics of the luminous flux can be secured, and the luminous efficiency in a high-temperature atmosphere can be maintained with the amalgam at the thin tube side.

According to the fluorescent lamp of the fourth aspect, in addition to the effect of the fluorescent lamp of the third aspect, since the mercury vapor pressure control capability of the amalgam on the capillary side is higher than that on the amalgam on the distal side, the luminous flux by the amalgam on the distal side And the luminous efficiency in a high-temperature atmosphere can be reliably maintained by the capillary-side amalgam.

According to the fluorescent lamp of the fifth aspect, in addition to the effect of the fluorescent lamp of the third aspect, the mercury vapor pressure control ability of the amalgam on the capillary side is lower than that of the amalgam on the distal side, so that the tip side at the time of lighting is reduced. The rising characteristics of the luminous flux by the amalgam can be assisted by the capillary-side amalgam.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a bulb part showing one embodiment of a fluorescent lamp of the present invention.

FIG. 2 is an end view of a front end side of the fluorescent lamp.

FIG. 3 is a diagram illustrating rising characteristics of a light beam according to the first embodiment;

FIG. 4 is a cross-sectional side view of a bulb part showing another embodiment of the fluorescent lamp of the present invention.

[Explanation of symbols]

 21 Bulb 22 Bulb section 23 Bridge section 26 Electrode 30 Capillary tube 32 Phosphor 33 Tip amalgam 34 Capillary amalgam

Claims (5)

[Claims] 1. A valve having a plurality of valve portions arranged in parallel and a bridge portion for connecting and communicating the distal ends of the valve portions to each other; formed on an inner surface of the valve except for the distal end of the valve. An electrode sealed at both ends on the base end side of the bulb; and a tip amalgam fixed to an inner surface of the bulb where the phosphor is not formed;
A fluorescent lamp comprising: 2. The fluorescent lamp according to claim 1, wherein the tip side amalgam is welded to an inner surface on the tip side of the bulb. 3. The fluorescent lamp according to claim 1, further comprising a thin tube communicating with the inside of the bulb at a base end side of the bulb, wherein the thin tube-side amalgam is sealed in the thin tube. 4. The mercury vapor pressure control capability of the amalgam on the capillary side is higher than that on the amalgam on the tip side.
The fluorescent lamp as described. 5. The mercury vapor pressure control ability of the amalgam on the capillary side is lower than that of the amalgam on the tip side.
The fluorescent lamp as described.