JPH0621147U - Straight tube fluorescent lamp - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent damage to a straight tube type fluorescent lamp with a high tube wall load where the lamp bulb becomes hot. [Structure] At least the maximum outer diameter of the cap on one side is larger than the outer diameter of the glass bulb of the straight tube fluorescent lamp.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the prevention of damage to a straight tube type lamp with a high tube wall load, in which the lamp bulb becomes hot.

[0002]

[Prior art]

 Conventionally, most of fluorescent lamps used for general lighting are manufactured so as to conform to JIS-C7601, and a glass tube for fluorescent lamp according to JIS-C7708 and a base according to JIS-C7709 are used. The product has a smaller outer diameter of the base than the outer diameter of the lamp glass portion as shown in FIG. 1 of JIS-C7601.

On the other hand, in recent years, for the purpose of downsizing and thinning of lighting equipment, a lamp having a small tube diameter and a high tube wall load is required.

[0004]

[Problems to be solved by the device]

 The straight tube fluorescent lamp specified in JIS-C7601 has a low tube wall load and the temperature of the glass part of the lamp does not rise too much. Therefore, even if it comes in contact with other low temperature objects, the temperature difference is small and there is no damage. Although no problem occurred, if the lamp power is the same and the lamp tube diameter is made smaller, the tube wall load becomes higher, and the lamp temperature becomes extremely high as the lamp heats up. In this case, for example, when the lamp is replaced for a reason such as life expectancy immediately after the lamp has been lit continuously for a long time, the removed high temperature lamp is placed on an office desk, and when the lamp is replaced with a desk top surface that is the same as the ambient temperature. The glass bulb of the lamp, which has reached a high temperature, came into contact with the glass, causing the glass to cool rapidly and being broken and scattered, creating a problem.

The present invention has been made to solve the problems described above, and an object thereof is to obtain a fluorescent lamp in which the lamp is not easily damaged.

[0006]

[Means for Solving the Problems]

 In the fluorescent lamp of the present invention, at least one of the caps has an outer diameter larger than the outer diameter of the glass bulb of the straight tube fluorescent lamp.

[0007]

[Action]

 In general, it is well known that glass is easily broken, so it is rare to place a lamp on an uneven or protruding portion or to place excessive stress on the glass. , Usually handled very carefully, the removed lamp is placed on a flat surface such as an office desk or floor. At this time, since the outer diameter of at least one of the caps is larger than that of the lamp glass bulb, the glass bulb does not come into contact with a flat surface such as an office desk or a floor. Therefore, no sudden temperature change is applied to the glass bulb and damage can be prevented.

[0008]

【Example】

The details of the fluorescent lamp of the present invention will be described with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows an embodiment of the present invention. Bases 1 in which pins 3 are planted are provided at both ends of a soda-glass lamp body 2. Further, assuming that the outer diameter of the base is Dc ₁ and Dc ₂ and the outer diameter of the lamp bulb is D _L , D _C1 = D _C2 > D _{L in} FIG. 1. FIG. 2 shows another embodiment of the present invention, where D _C1 = D _L <D _C2 . In any of the examples, as long as the lamp length was at least 1200 mm or less, the bending of the glass was negligible, and when the lamp was left stationary on the flat surface, the glass bulb portion did not contact the flat surface.

FIG. 3 shows a conventional fluorescent lamp, in which D _C1 = D _C2 <D _L, and even if at least D _C1 = D _L = D _C2 , the glass comes into contact with a flat surface.

Now, when a lamp having an outer diameter of 16.5 mm, a wall thickness of 0.9 mm, and a length between bases of 420 mm is lit at an ambient temperature of 0 ° C. with a lamp power of 27 W, the temperature at the center of the lamp is The temperature was 70 ° C and 125 ° C near the electrodes. When this was lit with a semi-cylindrical cylinder with a diameter of 30 mm, which was assumed to be a learning stand, was lit up with the lamp as the central axis, the temperature at the center of the lamp was 120 ° C, and the temperature near the electrode was 170 ° C. Rose. This was approximately similar to the state in which the lamp alone was turned on in the atmosphere of the ambient temperature of 70 ° C. A semi-cylindrical cylinder was put on the lamp, the lamp was lit continuously, and then the lamp was removed and placed on a flat iron plate at 0 ° C. An experiment was carried out. It was D _C1 = D _C2 = 18.5> D in the configuration of Fig. 1. _{At L} 16.5, none of the lamp bulb glass was broken. On the other hand, when Dc ₁ = Dc ₂ = D _L = 16.5 in the configuration of FIG. 3, the glass was broken at an incidence of about 3%.

Even in the case of the lamp as shown in FIG. 3, the same effect was obtained by mounting the ring whose outer diameter D _A was D _A2 > D _L (> D _C2 ). This ring does not have to be a complete donut shape, it is partially cut out, and even if it can be attached to the base from here, it is effective as long as the lamp glass floats above the floor.

By the way, in the case of a lamp having a small perfect load, which is generally used in the past, the temperature of the glass portion does not rise so much even when continuously lit, and therefore, even if the glass portion is left still on the floor surface, the temperature difference causes Nothing was damaged.

[0013]

[Effect of device]

 As described above, in the fluorescent lamp of the present invention, the glass portion does not contact the flat surface such as the floor, so that the damage due to the temperature difference can be prevented.

Further, even if there is sand, dust, or the like on the floor or the like, the glass is not in contact with this surface, so that the damage can be suppressed even when the lamp rolls.

Further, when the lamps are stacked, if their lengthwise directions are aligned, the glass portions of adjacent lamps do not come into contact with each other, so that damage can be prevented.

[0016] Further, even when it is carried in a corrugated board or the like and transported, all the pressure from above is applied to the mouthpiece, so that damage during transportation is reduced.

[Submission date] April 14, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Even in the case of the lamp as shown in FIG. 3, the same effect can be obtained by mounting the ring 4 having the outer diameter D _A of D _A2 > D _L (> D _{C 2} ). (Fig. 4). This ring does not have to be a perfect donut shape, it is partially cut off, and even if it can be attached to the base from here, it is effective if the lamp glass is raised above the floor surface. .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

By the way, in the case of a lamp with a small perfect load, which is generally used in the past, the temperature of the glass portion does not rise so much even in the continuous lighting, and therefore, even if the lamp is left standing on the floor, the temperature difference causes Nothing was damaged.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment.

FIG. 3 is a diagram showing a conventional example.

[Explanation of symbols]

 1 base 2 lamp body 3 pins

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 8, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 4

[Correction method] Added

[Correction content]

FIG. 4 is a diagram showing another different embodiment. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 14, 1992

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (2)

[Scope of utility model registration request] 1. A straight tube fluorescent lamp having a detachable length of 1200 mm or less, wherein the glass bulb has a wall thickness of 0.9 mm or less, and a lamp tube wall load during lighting is 0.14 W / cm ² or more. A straight tube fluorescent lamp, wherein at least one of the caps provided on the base has a maximum outer diameter larger than the outer diameter of the lamp bulb portion. 2. A straight tube fluorescent lamp having a detachable length of 1200 mm or less, wherein the glass bulb has a wall thickness of 0.9 mm or less, and a lamp tube wall load during lighting is 0.14 W / cm ² or more. A straight tube fluorescent lamp characterized in that a ring having a diameter larger than the outer diameter of the lamp is attached to the base of the tube.