JP2007258083A - Luminaire for low temperature - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent temperature drop of a fluorescent lamp, to suppress drop of optical output in a low temperature range, and to firmly attach a material having a high level of heat transfer to the outside surface of a tube wall regardless of the diameter of a fluorescent lamp. <P>SOLUTION: A heat transfer member 4 having a superimposed part with both circumferential ends superimposed on each other by a predetermined width is attached to the fluorescent lamp. This luminaire is provided with: a first heat insulation cover 3-1 for storing the fluorescent lamp and the heat transfer member 4 therein; a second heat insulation cover 3-2 for storing the first heat insulation cover 3-1 therein; and a third heat insulation cover 3-3 for storing the second heat insulation cover 3-2 therein. In addition, first packing is arranged between the fluorescent lamp and the first heat insulation cover 3-1, and third packing is arranged between the first heat insulation cover 3-1 and the second heat insulation cover 3-2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique relating to a low-temperature lighting apparatus used in, for example, a cold room.

A low-temperature lighting apparatus used in a low greenhouse or the like needs to suppress a decrease in lamp output due to a low temperature. Here, the temperature drop at the coldest point has a strong influence on the light output of the fluorescent lamp. Therefore, there is a technique for increasing the temperature of the coldest spot by covering the outer surface of the tube wall from the coldest spot of the fluorescent lamp to a portion higher in temperature than the coldest spot with a material having a high heat transfer rate. In addition, there is a technique for adjusting the temperature by changing the position of the opening by using a C-shaped material with high heat conductivity covering the outer surface of the tube wall.
JP 2001-23575 A

By simply covering the outer surface of the tube wall with a material having high heat transfer, there is a problem that the temperature of the entire fluorescent lamp, particularly the coldest point, is lowered and the lamp output is reduced. In particular, when there is an opening in a material having a high heat transfer rate that covers the outer surface of the tube wall, there is a problem that the temperature decreases. In addition, there is an error (± 1.5 mm tolerance) in the diameter of the fluorescent lamp, and depending on the diameter of the fluorescent lamp, there is a problem that a material having high heat transfer cannot be adhered to the outer surface of the tube wall.
An object of the present invention is to prevent, for example, a decrease in temperature of a fluorescent lamp and suppress a decrease in light output in a low temperature range. It is another object of the present invention to adhere a material having a high heat transfer to the outer surface of the tube wall regardless of the diameter of the fluorescent lamp.

  The low-temperature lighting apparatus according to the present invention includes, for example, an apparatus main body, a socket part provided on the apparatus main body, to which a straight tube fluorescent lamp is detachably attached, and both ends in the circumferential direction having a predetermined width. It has a substantially cylindrical shape with overlapping portions, and is substantially in close contact with the outer surface of the tube from the vicinity of the base of the fluorescent lamp to the high temperature portion of the fluorescent lamp attached to the socket portion by elasticity, so that the outer surface of the tube is at least 1 And a heat transfer member that covers the periphery.

  According to the low-temperature lighting apparatus according to the present invention, for example, there is a tolerance of the diameter of the fluorescent lamp because the both ends in the circumferential direction overlap each other by a predetermined width and the heat transfer member is elastic. Can also be adhered to the entire circumferential surface of the tube wall of the fluorescent lamp. Therefore, it is possible to prevent the temperature of the fluorescent lamp from decreasing.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
First, the first embodiment will be described. In the first embodiment, the overall configuration of the low-temperature lighting apparatus 100 will be described.

  FIG. 1 is a front half sectional view of a low temperature lighting apparatus 100 according to a first embodiment. FIG. 2 is a side sectional view of the low-temperature lighting apparatus 100 according to the first embodiment. The front side sectional view of the low-temperature lighting apparatus 100 shown in FIG. 1 is a view seen from the CC ′ direction in FIG. 2, the right side of the BB ′ line in FIG. FIG. A side sectional view of the low-temperature lighting apparatus 100 shown in FIG. 2 is a sectional view seen from the A-A ′ direction in FIG. 1.

The low temperature lighting apparatus 100 includes an apparatus main body 1 and a socket part 2. The socket part 2 is provided in the instrument body 1. Further, a straight tube type fluorescent lamp is detachably attached to the socket portion 2. A heat transfer member 4 (heat conductor) that is a coldest spot heating member that raises the coldest spot temperature is detachably attached to the fluorescent lamp. The heat transfer member 4 covers and closely adheres to the outer surface of the tube from the glass tube end 7 (see FIG. 4), which is the coldest point of the fluorescent lamp, to the filament 8 (see FIG. 4), which is the high temperature portion. That is, the high temperature of the filament portion 8 of the fluorescent lamp is transferred to the coldest spot at the end of the fluorescent lamp, thereby raising the temperature of the coldest spot. The first heat retaining cover 3-1 is a cylindrical cover having transparency that accommodates the fluorescent lamp while providing a predetermined space between the first heat insulating cover 3-1 and the fluorescent lamp. The second heat insulating cover 3-2 is a cylindrical cover having transparency that accommodates the first heat insulating cover 3-1, while providing a predetermined space between the second heat insulating cover 3-1. . The third heat insulating cover 3-3 is a cylindrical cover having transparency that accommodates the second heat insulating cover 3-2 while providing a predetermined space between the third heat insulating cover 3-2. .
Therefore, there is a first air layer between the fluorescent lamp and the first heat insulating cover 3-1. Moreover, a 2nd air layer exists between the 1st heat insulation cover 3-1 and the 2nd heat insulation cover 3-2. In addition, there is a third air layer between the second heat retaining cover 3-2 and the third heat retaining cover 3-3.
Further, the first packing 5-1 fills the space between the fluorescent lamp and the first heat insulating cover 3-1, at the axial end of the fluorescent lamp. When the heat transfer member 4 is attached to the fluorescent lamp, the first packing 5-1 has the heat transfer member 4 attached to the fluorescent lamp and the first heat retaining cover 3- at the axial end of the heat transfer member 4. Fill the space between 1. The second packing 5-2 fills the space between the first heat retaining cover 3-1 and the second heat retaining cover 3-2 at the axial end of the fluorescent lamp. Moreover, normally, the 1st packing 5-1 and the 2nd packing 5-2 are provided in the axial direction both ends of a fluorescent lamp.

According to the low temperature lighting apparatus 100 according to the first embodiment, the fluorescent lamp is covered with the first heat insulating cover 3-1, the second heat insulating cover 3-2, and the third heat insulating cover 3-3, so that the periphery of the fluorescent lamp A first air layer, a second air layer, and a third air layer are formed. That is, the three air layers can be made independent and substantially sealed. Therefore, it is possible to keep the fluorescent lamp warm.
Further, according to the low temperature lighting apparatus 100 according to the first embodiment, by providing the heat transfer member 4, the heat of the high temperature part can be transmitted to the vicinity of the base part of the fluorescent lamp which is the coldest point. Therefore, it is possible to increase the temperature in the vicinity of the base portion of the fluorescent lamp.
Furthermore, according to the low-temperature lighting apparatus 100 according to the first embodiment, by providing the first packing 5-1 and the second packing 5-2, the sealing performance of each heat insulating cover is increased. Therefore, the heat retention is higher.

Embodiment 2. FIG.
Next, a second embodiment will be described. In the second embodiment, the heat transfer member 4 will be described.

FIG. 3 is a view showing the heat transfer member 4. FIG. 3A is a perspective view of the heat transfer member 4, and FIG. 3B is a DD ′ cross-sectional view of the heat transfer member 4. FIG. 4 is a configuration diagram seen from the side direction showing a state in which the heat transfer member 4 is attached to the straight tube type fluorescent lamp 6. In FIG. 4, the heat transfer member 4 is indicated by oblique lines.
The heat transfer member 4 has a substantially cylindrical shape having an overlapping portion 15 in which both end portions in the circumferential direction overlap each other by a predetermined width. That is, the heat transfer member 4 has an outer portion 10 that is the outer side and an inner portion 11 that is the inner side in the overlapping portion 15. Further, the heat transfer member 4 substantially adheres to the outer surface of the fluorescent lamp at least from the coldest spot to the high temperature portion by elasticity, and covers the outer surface of the tube at least once. Here, the coldest spot of the straight tube type fluorescent lamp 6 is generally near the center of the straight tube type fluorescent lamp 6, but in a low temperature environment, the metal base portion having high heat conductivity is cooled by the outside air, so that the glass tube is cooled. It becomes the tube end 7. Moreover, the high temperature part which becomes higher temperature than the coldest point is the filament part 8 vicinity. The heat transfer member 4 is formed, for example, by rolling a single plate made of a material having high thermal conductivity into a cylindrical shape. By memorizing the rounded shape, if the circumference is expanded more than the memorized shape, elasticity in the direction of reducing the circumference is generated.

  Therefore, according to the heat transfer member 4 according to the second embodiment, since there is a margin for the overlapping portion 15, there is an error in the diameter of the fluorescent lamp, and even when the diameter is increased, the error is absorbed. It is possible to cover the outer surface of the fluorescent lamp at least once. Further, since it has elasticity in the direction of shrinking the circumference, it can be substantially in close contact with the outer surface of the fluorescent lamp regardless of the diameter.

FIG. 5 is a perspective view of the heat transfer member 4 having the return portion 13, the heat transfer member taper portion 14, and the heat transfer member convex portion 16.
The return portion 13 is formed by folding one end in the axial direction of the heat transfer member 4 formed in a substantially cylindrical shape outward in the circumference. Further, the heat transfer member taper portion 14 is formed so that the outer wall of the heat transfer member 4 formed in a substantially cylindrical shape extends in a trumpet shape toward the opposite end to the return portion 13 in the axial direction. The heat transfer member convex portion 16 is provided in a convex shape at a predetermined position on the outer wall.

  Therefore, according to the heat transfer member 4 according to the second embodiment, the first heat retaining cover 3-1 is transferred by attaching the first packing 5-1 between the return portion 13 and the heat transfer member convex portion 16. When attaching to the heat member 4 or removing it, the first packing 5-1 is not displaced by having the return portion 13 and the heat transfer member convex portion 16. That is, the return portion 13 locks the first packing 5-1 from shifting toward the axial return portion 13 side. Further, the heat transfer member convex portion 16 stops the first packing 5-1 from shifting toward the axial heat transfer member tapered portion 14 side. Moreover, when attaching a fluorescent lamp to the heat transfer member 4, the fluorescent lamp is inserted from the heat transfer member taper portion 14 toward the return portion 13, so that the entrance portion is widened so that it can be easily attached. Can do.

FIG. 6 is a perspective view of the heat transfer member 4 having a slit. FIG. 7 is a cross-sectional view of the heat transfer member 4 having a slit. 7A is a cross-sectional view taken along the line EE ′ shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line FF ′.
The heat transfer member 4 includes a slit portion 17 having a predetermined number from one end in the axial direction on one end side. Here, the slit portion 17 is provided with slits 17a, 17b, and 17c. The length of the slits 17a, 17b, 17c is a predetermined length that is at least the length from the coldest spot to the high temperature part of the fluorescent lamp attached to the socket part.
In addition, a portion on the other end side in the axial direction of the slit portion 17 from the slit end portion 18 which is an axial end portion of each slit provided in the slit portion 17 is a connection portion 19 in which no slit is provided. As shown in FIG. 7, the radius R2 of the cross section of the connecting portion 19 is larger than the radius R1 of the cross section of the slit portion 17.

  Therefore, according to the heat transfer member 4 according to the second embodiment, the slit portion 17 is substantially in close contact with the outer surface of the fluorescent lamp tube by adjusting the cross-sectional diameter of the slit portion 17 to the diameter of the fluorescent lamp. In addition, since the slit portion 17 is provided with slits 17a, 17b, and 17c, even if there is an error in the diameter of the fluorescent lamp, the slit 17a absorbs the error by the slits 17a, 17b, and 17c and is substantially on the outer surface of the tube. It is possible to adhere. On the other hand, the connecting portion 19 has a cross-sectional radius larger than the cross-sectional radius of the slit portion 17, and therefore does not hinder the insertion of the fluorescent lamp even when there is an error in the diameter of the fluorescent lamp.

Embodiment 3 FIG.
Next, Embodiment 3 will be described. In the third embodiment, the first packing 5-1 will be described.

FIG. 8 is a view showing the first packing 5-1. FIG. 8A is a perspective view of the first packing 5-1, and FIG. 8B is a perspective view of the state in which the first packing 5-1 is attached to the heat transfer member 4.
As described above, the first packing 5-1 fills the space between the fluorescent lamp and the first heat retaining cover 3-1, at the axial end of the fluorescent lamp. When the heat transfer member 4 is attached to the fluorescent lamp, the first packing 5-1 has the heat transfer member 4 attached to the fluorescent lamp and the first heat retaining cover 3- at the axial end of the heat transfer member 4. Fill the space between 1. That is, the first packing 5-1 is formed in a substantially cylindrical shape, and is attached in close contact with the axial end of the outer surface of the fluorescent lamp tube or the axial end of the outer wall of the heat transfer member 4. The first packing 5-1 is attached in close contact with the inner wall of the first heat retaining cover 3-1. And when attaching to the heat-transfer member 4, it attaches between the return part 13 and the heat-transfer member convex part 16. FIG. Moreover, the 1st packing 5-1 is attached to the heat-transfer member 4 by adhesion or adhesion | attachment, for example. Further, the first packing 5-1 is formed of a single (independent) bubble-based sponge material so that the hermeticity is maintained even if there is a tolerance of the diameter of the fluorescent lamp.

FIG. 9 is a view showing a first packing 5-1 having a packing recess 20 and a packing protrusion 21. 9A is a plan view of the first packing 5-1 having the packing recess 20 and the packing protrusion 21, and FIG. 9B is a stage in the middle of attaching the first packing 5-1 to the heat transfer member 4. (C) is a perspective view of a state in which the first packing 5-1 is attached to the heat transfer member 4. FIG. In (b), the inner side portion 11 of the heat transfer member 4 and the outer side portion 10 covered with the first packing 5-1 are indicated by broken lines. FIG. 10 is a perspective view of the heat transfer member 4 having the heat transfer member recess 12.
As shown in FIG. 9, the packing recess 20 is provided in a concave shape at one end in the circumferential direction of the first packing 5-1. The packing convex portion 21 is provided in a convex shape at the other end where the circumferential packing concave portion 20 of the first packing 5-1 is provided. The first packing 5-1 is attached so as to cover the periphery of the fluorescent lamp or the heat transfer member 4 by fitting the packing concave portion 20 and the packing convex portion 21 together. Further, the first packing 5-1 is attached to the fluorescent lamp or the heat transfer member 4 with one end provided with the packing concave portion 20 and the other end provided with the packing convex portion 21 being in close contact with each other.
Furthermore, as shown in FIG. 10, the heat transfer member 4 has a concave heat transfer member recess 12 provided at the circumferential end of the outer portion 10 by being cut out in the circumferential direction. In the first packing 5-1, the circumferential end of the outer portion 10 is substantially coincident with the close contact position where the one end provided with the packing concave portion 20 and the other end provided with the packing convex portion 21 are substantially in close contact. Attached. The first packing 5-1 is attached so that the heat transfer member recess 12 and the packing recess 20 are substantially aligned with each other, and the packing protrusion is formed on the inner side portion 11 that is the inner side of the overlapping portion 15 via the heat transfer member recess 12. 21 is attached.

Therefore, according to the first packing 5-1 according to the third embodiment, the hermeticity between the fluorescent lamp or the heat transfer member 4 and the first heat retaining cover 3-1 is enhanced. Therefore, since the air in the first air layer does not leak, the heat retaining power is increased.
In addition, according to the first packing 5-1 according to the third embodiment, when there is an error in the fluorescent lamp and the diameter is increased, one end provided with the packing recess 20 and the packing protrusion 21 are provided. Even if the close contact with the end becomes weak, the sealability between the fluorescent lamp or the heat transfer member 4 and the first heat retaining cover 3-1 does not deteriorate because the packing recesses 20 and the packing protrusions 21 are provided. That is, even if the close contact between the one end provided with the packing recess 20 and the other end provided with the packing projection 21 is weak, the packing recess 20 and the packing projection 21 can form a continuous space in the axial direction. There is no.
Furthermore, according to the first packing 5-1 according to the third embodiment, the packing convex portion 21 is attached to the inner side portion 11 which is the inner side of the overlapping portion 15 via the heat transfer member concave portion 12. Therefore, the first packing 5-1 does not prevent the circumference of the heat transfer member 4 from spreading. That is, even if it has the packing recessed part 20 and the packing convex part 21, and it is a case where it adheres or adheres to the heat-transfer member 4, it can absorb the error of a fluorescent lamp.

Embodiment 4 FIG.
Next, a fourth embodiment will be described. In the fourth embodiment, the second packing 5-2 will be described.

FIG. 11 is a diagram showing the second packing 5-2. (A) of FIG. 11 is a perspective view of the 2nd packing 5-2, (b) is a perspective view of the state which attached the 2nd packing 5-2 to the 1st heat insulation cover 3-1, c) is a perspective view of a state in which the second packing 5-2 is attached to the first heat retaining cover 3-1 and the second heat retaining cover 3-2. FIG. 12 is a GG ′ cross-sectional view of the second packing 5-2.
As described above, the second packing 5-2 fills the space between the first heat retaining cover 3-1 and the second heat retaining cover 3-2 at the axial end of the fluorescent lamp. That is, the second packing 5-2 is formed in a substantially cylindrical shape and attached in close contact with the axial end portion of the outer wall of the first heat retaining cover 3-1. The second packing 5-2 is attached in close contact with the inner wall of the second heat insulating cover 3-2.

The second packing 5-2 has fringes 30a and 30b that go around the inner wall in the circumferential direction. Moreover, the 2nd packing 5-2 has the packing 4th taper part 31 which an inner wall narrows in a reverse trumpet shape toward an axial direction edge part. The second packing 5-2 is attached to the first heat retaining cover 3-1, with the fringes 30a and 30b, the packing fourth taper portion 31, and the outer wall of the first heat retaining cover 3-1 being in close contact with each other. Moreover, the 2nd packing 5-2 has the packing 1st taper part 26 which an outer wall spreads in a trumpet shape toward an axial direction edge part. The second packing 5-2 is attached to the second heat insulating cover 3-2 with the packing first tapered portion 26 being in close contact with the inner wall of the second heat insulating cover 3-2. Moreover, the 2nd packing 5-2 has the convex packing latching | locking part 27 on the outer side of the periphery in the outer wall of the axial direction one end of the side in which the packing 1st taper part 26 was provided. The packing locking part 27 may be provided at the end of the packing first taper part 26. Further, the second packing 5-2 has a packing second taper portion 28 whose outer wall narrows in a reverse trumpet shape toward the opposite axial end portion where the packing first taper portion 26 is provided. The second packing 5-2 has a packing third taper portion 29 whose inner wall extends in a trumpet shape toward the axial end on the side where the packing second taper portion 28 is provided.
Here, spreading from A to B in a trumpet shape means that the circumference spreads from A to B, and the spreading angle may or may not be constant. Further, narrowing from A to B in a reverse trumpet shape means that the circumference narrows from A to B, and the narrowing angle may or may not be constant. In other words, the trumpet shape is, in other words, a C shape, an eight character shape, a bell shape, a flare shape, or a taper shape.
That is, the lengths of the diameters shown in FIG. 12 are R3 <R4 <R5, R6 <R7, and R8 <R9 <R10.
Moreover, since the 2nd packing 5-2 pushes in and attaches the 1st heat retention cover 3-1 and the 2nd heat retention cover 3-2, it is desirable to form with rubber | gum etc. so that it can endure the pressure.

According to the 2nd packing 5-2 concerning Embodiment 4, by having fringe 30a, 30b and packing 1st taper part 26, it is the 1st heat insulation cover 3-1 and the 2nd heat insulation cover 3-2. Sealing is improved. Accordingly, since the air in the second air layer does not leak, the heat retaining power is increased.
Moreover, according to the 2nd packing 5-2 concerning Embodiment 4, since it has the packing latching | locking part 27, it can prevent that the 2nd packing 5-2 enters into the inside of the 2nd heat insulation cover 3-2.
Furthermore, according to the second packing 5-2 according to the fourth embodiment, the packing third taper portion 29 is provided, so that when the second packing 5-2 is attached to the first heat retaining cover 3-1, the packing second It can attach easily by inserting in the 1st heat retention cover 3-1 from the 3 taper part 29 side.
Furthermore, according to the second packing 5-2 according to the fourth embodiment, when the second packing 5-2 is attached to the second heat retaining cover 3-2 by having the packing second tapered portion 28, It can attach easily by inserting in the 2nd heat insulation cover 3-2 from the packing 2nd taper part 28 side.

Embodiment 5 FIG.
Next, a fifth embodiment will be described. In the fifth embodiment, the results of measuring the heat retaining power and the light output when the heat retaining covers 3-1, 3-2, 3-3 and the heat transfer member 4 described in the above embodiment are mounted will be described.

FIG. 13 is a diagram illustrating a measurement result when the ambient temperature is −30 ° C. FIG. 14 is a bar graph showing the ratio of the actually measured light output value to the maximum light output value at the time of relighting shown in FIG.
In FIG. 13, test No. (trial No) 1 is the result when a double cover is attached. The case where the double cover is mounted is a case where the first heat retaining cover 3-1 and the second heat retaining cover 3-2 are mounted on the instrument main body 1. Test No2 is the result when the double cover and the heat transfer member 4 are mounted. That is, this is a case where the heat transfer member 4, the first heat retaining cover 3-1, and the second heat retaining cover 3-2 are attached. Test No3 is a result when the triple cover and the heat transfer member 4 are mounted. The case where the triple cover is attached is a case where the first heat insulation cover 3-1, the second heat insulation cover 3-2 and the third heat insulation cover 3-3 are attached. That is, this is a case where the heat transfer member 4, the first heat insulation cover 3-1, the second heat insulation cover 3-2, and the third heat insulation cover 3-3 are attached.
Further, in FIG. 13, for each test, for the initial lighting, relighting, and maximum light output, the temperature of five locations, the actual measured value (lux) of light output under a predetermined condition, and light Indicates the ratio to the maximum output value. The five locations at which the temperature was measured were the corner of the base opposite to the glass tube, the glass tube outermost part 7, the filament part 8, and the part 200 mm away from the lamp center toward the end (lamp center → 200 ), And the center of the lamp.
Here, the fluorescent lamp is first stored at room temperature (25 ° C.) and then cooled (−30 ° C.). Then, the light is turned on, the light is stabilized, and the light is turned off. This process from turning on to turning off is called initial lighting. Next, it is cooled again (−30 ° C.). Then, the light is turned on, the light is stabilized, and the light is turned off. This process from turning on to turning off is called relighting.

As a result, in all the tests, the temperature of the glass tube outermost end portion 7 was the lowest among the five temperature measurement locations. That is, it was found that the glass tube end 7 is the coldest point regardless of which member is mounted. However, in each test, the temperature at the coldest spot changes, and the light output also changes.
In the case of test No. 1, the coldest spot temperature was 4.8 ° C. during initial lighting and 4.1 ° C. during re-lighting. The light output with respect to the maximum light output was 15.9% at the time of initial lighting and 14.7% at the time of relighting. In the case of test No. 2, the coldest spot temperature was 20.0 ° C. during initial lighting and 20.4 ° C. during re-lighting. The light output with respect to the maximum light output value was 62.4% at the time of initial lighting and 64.2% at the time of relighting. In the case of test No. 3, the coldest spot temperature was 31.5 ° C. during initial lighting and 31.0 ° C. during re-lighting. The light output with respect to the maximum light output was 85.8% at the time of initial lighting and 85.1% at the time of relighting.
When the double cover and the heat transfer member 4 are attached, the optical output is about four times that when the double cover is attached. Further, when the triple cover and the heat transfer member 4 are mounted, the light output is about 1.3 times that when the double cover and the heat transfer member 4 are mounted.

FIG. 15 is a diagram showing the position of mercury in the fluorescent lamp. FIG. 15A shows the position of mercury at normal temperature, and FIG. 15B shows the position of mercury at low temperature.
Mercury in the fluorescent lamp liquefies when the fluorescent lamp cools and collects at the coldest spot. That is, as shown in (a) at normal temperature, mercury is located in the center of the glass tube of the fluorescent lamp, which is the coldest point at normal temperature. However, if the fluorescent lamp is cooled and the temperature is not sufficiently maintained, the base portion is particularly cooled and the coldest point moves from the base, so that mercury moves from the glass tube base of the fluorescent lamp as shown in FIG.
As mercury liquefaction progresses, the light output of the fluorescent lamp decreases. Therefore, it is necessary to raise the temperature of the coldest spot where a lot of liquefied mercury collects. In each test shown in FIGS. 13 and 14, the coldest spot is the end of the glass tube of the fluorescent lamp. Therefore, in each test shown in FIGS. 13 and 14, the temperature at the extreme end of the glass tube of the fluorescent lamp is closely related to the light output of the fluorescent lamp.

FIGS. 16, 17, and 18 are diagrams showing the relationship between the light output of the fluorescent lamp and the temperature at the extreme end of the glass tube of the fluorescent lamp. As for the optical output, the ratio of the optical output to the maximum optical output value is shown. FIG. 16 shows the relationship between the light output and the temperature when the double cover is attached corresponding to test No1. FIG. 17 shows the relationship between the light output and the temperature when the double cover and the heat transfer member 4 are attached corresponding to Test No2. FIG. 18 shows the relationship between the light output and the temperature when the triple cover and the heat transfer member 4 are attached corresponding to Test No3.
As shown in FIG. 16, when the double cover is attached, the temperature is about 0 ° C. and the light output is about 15% after about 20 minutes. Thereafter, the temperature rises to about 4-5 ° C., but the light output stabilizes at about 15%. As shown in FIG. 17, when the double cover and the heat transfer member 4 are attached, the temperature is about 15 ° C. and the light output is about 40% after about 20 minutes. Thereafter, when about 40 minutes have passed, the temperature is about 20 ° C. and the light output is about 63%, which is stable. As shown in FIG. 18, when the triple cover and the heat transfer member 4 are mounted, the temperature is about 20 ° C. and the light output is about 50% after about 20 minutes. Thereafter, when about 40 minutes have passed, the temperature is about 31 ° C. and the light output is about 85%, which is stable.

  In summary, when the ambient temperature is −30 ° C., the triple cover and the heat transfer member 4 are preferably attached. Further, even when the triple cover and the heat transfer member 4 are mounted, the temperature of the coldest point has not reached the temperature at which the light output reaches the maximum value, and therefore a heat insulating cover may be further provided. . Further, when the ambient temperature is higher than −30 ° C. and the coldest spot temperature exceeds the temperature at which the light output reaches the maximum value, the double cover and the heat transfer member 4 may be attached. Moreover, it is good also as only a double cover.

FIG. 2 is a front half sectional view of the low-temperature lighting apparatus 100 according to the first embodiment. 1 is a side cross-sectional view of a low temperature lighting apparatus 100 according to a first embodiment. The figure which shows the heat-transfer member 4. FIG. Sectional drawing seen from the side surface direction which shows the state which attached the heat-transfer member 4 to the straight tube | pipe type fluorescent lamp 6. FIG. The perspective view of the heat-transfer member 4 which has the return part 13, the heat-transfer member taper part 14, and the heat-transfer member convex part 16. FIG. The perspective view of the heat-transfer member 4 which has a slit. Sectional drawing of the heat-transfer member 4 which has a slit. The figure which shows the 1st packing 5-1. The figure which shows the 1st packing 5-1 which has the packing recessed part 20 and the packing convex part 21. FIG. The perspective view of the heat-transfer member 4 which has the heat-transfer member recessed part 12. FIG. The figure which shows the 2nd packing 5-2. G-G 'sectional drawing of the 2nd packing 5-2. The figure which shows a measurement result in case ambient temperature is -30 degreeC. The bar graph which showed the ratio of the optical output actual measurement value with respect to the optical output maximum value at the time of relighting shown in FIG. The figure which shows the position of the mercury in a fluorescent lamp. The figure which shows the relationship between the light output at the time of mounting | wearing with a double cover, and temperature. The figure which shows the relationship between the optical output at the time of mounting | wearing with a double cover and the heat-transfer member 4, and temperature. The figure which shows the relationship between the optical output at the time of mounting | wearing with a triple cover and the heat-transfer member 4, and temperature.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Instrument main body, 2 Socket part, 3-1 1st heat insulation cover, 3-2 2nd heat insulation cover, 3-3 3rd heat insulation cover, 4 Heat-transfer member, 5-1 1st packing, 5-2 2nd packing , 6 Straight tube type fluorescent lamp, 7 Glass tube endmost part, 8 Filament part, 10 Outer part, 11 Inner part, 12 Heat transfer member concave part, 13 Return part, 14 Heat transfer member taper part, 15 Overlapping part, 16 Heat transfer member convex part, 17a, 17b, 17c slit, 18 slit end part, 19 connection part, 20 packing concave part, 21 packing convex part, 22 contact position, 23 outer walls, 24 inner walls, 25a, 25b side surface, 26 Packing 1st taper part, 27 Packing locking part, 28 Packing 2nd taper part, 29 Packing 3rd taper part, 30a, 30b Fringe, 31 Packing 4th taper Part.

Claims (13)

An instrument body;
A socket part provided in the instrument body, to which a straight fluorescent lamp is detachably attached;
It has a substantially cylindrical shape with overlapping portions where both ends in the circumferential direction overlap each other by a predetermined width, and at least the outer surface of the tube from the vicinity of the base portion of the fluorescent lamp to the high temperature portion of the fluorescent lamp attached to the socket portion is substantially elastically elastic. A low-temperature lighting apparatus comprising: a heat transfer member that closely contacts and covers at least one round of the outer surface of the tube. The heat transfer member is
A return portion that folds one end of the substantially cylindrical axial direction outward in the circumference;
The low-temperature lighting apparatus according to claim 1, further comprising a heat transfer member convex portion provided in a convex shape at a predetermined position of the outer wall. The low-temperature lighting apparatus according to claim 1, wherein the heat transfer member includes a heat transfer member tapered portion whose outer wall extends in a trumpet shape toward one end in the axial direction of the substantially cylindrical shape. . The low temperature lighting apparatus further includes:
A cylindrical first heat insulating cover having transparency to accommodate the fluorescent lamp while providing a predetermined space between the fluorescent lamp and the fluorescent lamp;
A packing that fills a space between the heat transfer member and the first heat retaining cover at an axial end portion of the heat transfer member, and has a concave packing recess at one end in the circumferential direction, and the other end in the circumferential direction A convex packing convex portion, and the packing concave portion and the packing convex portion are fitted together, and the one end and the other end are in close contact with each other so as to cover and attach the periphery of the heat transfer member. The low-temperature lighting apparatus according to claim 1, further comprising a packing. The heat transfer member includes a concave heat transfer member recess at a circumferential end of the outer portion which is an outer side in the overlapping portion,
The first packing is attached with an end portion in the circumferential direction of the outer portion and a close contact position where the one end and the other end are in close contact with each other, and the heat transfer member recess and the packing recess The low-temperature lighting fixture according to claim 4, wherein the packing convex portions are attached to an inner side which is an inner side of the overlapping portion via the heat transfer member concave portion. The low temperature lighting apparatus further includes:
A cylindrical second heat insulating cover having transparency for accommodating the first heat insulating cover while providing a predetermined space between the first heat insulating cover and the first heat insulating cover;
The second packing for filling a space between the first heat insulation cover and the second heat insulation cover at an axial end portion of the first heat insulation cover. Low temperature lighting fixtures. The second packing has a fringe that goes around the inner wall in the circumferential direction, and a packing first taper that the outer wall spreads in a trumpet shape toward the axial end, and the fringe and the outer wall of the first heat insulation cover 7 is attached to the first heat insulating cover in close contact with the first heat insulating cover, and the first taper portion of the packing is attached to the second heat insulating cover in close contact with the inner wall of the second heat insulating cover. The lighting fixture for low temperature as described. The low-temperature lighting apparatus according to claim 6 or 7, wherein the second packing has a convex packing locking portion on an outer wall at one end in the axial direction. The low-temperature lighting apparatus according to any one of claims 6 to 8, wherein the second packing has a packing second taper portion whose outer wall narrows in an inverted trumpet shape toward an axial end portion. The low-temperature lighting apparatus according to any one of claims 6 to 9, wherein the second packing has a packing third taper portion whose inner wall extends in a trumpet shape toward an axial end portion. The low temperature lighting apparatus further includes:
11. The device according to claim 6, further comprising a third heat insulation cover having transparency for accommodating the second heat insulation cover while providing a predetermined space between the second heat insulation cover and the second heat insulation cover. A low temperature lighting apparatus according to any one of the above. An instrument body;
A socket part that is provided in the instrument body and in which a straight tube fluorescent lamp is detachably mounted;
A slit that is substantially cylindrical and has a predetermined number of slits of a predetermined length that is at least the length from the vicinity of the base portion of the fluorescent lamp to the high temperature portion of the fluorescent lamp that is attached to the socket portion from one end in the axial direction. And a heat transfer member having a radius of a cross section from the other end in the axial direction to a terminal end of the slit is larger than a radius of the cross section of the slit portion. An instrument body;
A socket part that is provided in the instrument body and in which a straight tube fluorescent lamp is detachably mounted;
A cylindrical first heat insulating cover having transparency to accommodate the fluorescent lamp while providing a predetermined space between the fluorescent lamp and the fluorescent lamp;
A cylindrical second heat insulating cover having transparency for accommodating the first heat insulating cover while providing a predetermined space between the first heat insulating cover and the first heat insulating cover;
A low-temperature luminaire comprising a transparent third heat insulation cover that accommodates the second heat insulation cover while providing a predetermined space between the second heat insulation cover and the second heat insulation cover.

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