JP5078953B2 - Fluorescent lamp - Google Patents

Description

  The present invention relates to a fluorescent lamp base into which a metal pin is inserted by press-fitting and a fluorescent lamp using the base.

  It is desirable that the metal pin holding force (base pin torque) of the base body during the manufacture of the base is in the range of 0.10 N · m to 0.12 N · m. If the holding force is smaller than 0.10 N · m, a defect such as a missing pin occurs. On the other hand, if the holding force is greater than 0.12 N · m, the pin torque can be maintained at a sufficient value. However, when the pin is inserted, the base cracks frequently occur, and scraps are often generated due to scraping of the base resin. Will adversely affect productivity.

  In addition, as a means for setting the metal pin holding force (base pin torque) of the base body in the range of 0.10 N · m to 0.12 N · m, the hole diameter Dh and the pin when inserting the metal pin by press-fitting A method has been employed in which the ratio Dh / Dp of the outer diameter Dp is kept in the range of 0.96 to 0.98, and the glass filler used as the reinforcing agent is made 5 wt% to 30 wt%.

  Maintaining the metal pin holding force of the base body during manufacture of the base in the range of 0.10 N · m to 0.12 N · m, and other performances required for fluorescent lamp bases (heat resistance, nonflammability, The selection of the most suitable resin and the blending ratio of pigments and the like have been carried out to realize the anti-color change property. For example, as the thermoplastic resin, polybutylene terephthalate (PBT), polyethylene terephthalate (PET), etc. having high heat resistance are selected as the thermoplastic resin. A white pigment such as titanium is added. The white pigment is added in an amount of 5 to 10% by weight in order to make the body color of the base body white and prevent discoloration due to high temperature or the like.

  Japanese Patent Application Laid-Open No. 08-273602 discloses a technique for darkening a resin case that houses a lighting circuit.

Japanese Patent Laid-Open No. 08-273602 Japanese Utility Model Publication No. 61-146851 JP 2001-307680 A

  Despite the fact that the metal pin holding force of the base body at the time of manufacturing the base is sufficient in the prior art, there is a problem that the pin sometimes comes off when the lamp is attached to or detached from the fixture in the market. It was found that the occurrence was more at the end of life (lighting time of about 10,000 hours).

  Therefore, in the embodiment of the present invention, from the initial use of the fluorescent lamp to the end of its life, when the lamp is attached to and detached from the fixture, the pin comes off, and when the lamp is turned off, It is desirable to prevent the dropout.

  An object of the present invention is to make discoloration due to heat at the time of lighting inconspicuous without using a white pigment.

  The fluorescent lamp according to the present invention has a base composed of a base body made of a thermoplastic resin and a pin press-fitted into a hole formed in the base body, and the thermoplastic resin contains 0.1% by weight of a black pigment. It contains above.

  The thermoplastic resin contains 0.2% by weight or more of a black pigment.

  The thermoplastic resin contains 0.5% by weight or more of a black pigment.

  The thermoplastic resin contains carbon black as a black pigment.

  The thermoplastic resin further contains 0 to 3% by weight of a white pigment.

  The thermoplastic resin further contains 0 to 2% by weight of a white pigment.

  The thermoplastic resin further contains a white pigment in an amount of 0% by weight to 1% by weight.

  The thermoplastic resin further contains 5 to 30% by weight of a glass filler.

  An initial pin holding force Fi at which the base body holds the pin when the fluorescent lamp is not used is 0.10 N · m or more and 0.12 N · m or less.

  The pin holding force Fe after use in which the base body holds the pin when the rated life time is lit is 0.08 N · m or more.

  The ratio Fe between the initial pin holding force Fi that holds the pin when the fluorescent lamp lamp is not used and the pin holding force Fe after use that the base holds the pin when the lamp body is lit for the rated life time. / Fi is 0.66 or more.

  The ratio Fe between the initial pin holding force Fi that holds the pin when the fluorescent lamp lamp is not used and the pin holding force Fe after use that the base holds the pin when the lamp body is lit for the rated life time. / Fi is 0.8 or more.

  The ratio Dh / Dp between the hole diameter Dh of the hole formed in the base body and the outer diameter Dp of the pin is 0.89 or more and 0.99 or less.

  The ratio Dh / Dp between the hole diameter Dh of the hole formed in the base body and the outer diameter Dp of the pin is 0.92 or more and 0.98 or less.

  The ratio Dh / Dp between the hole diameter Dh of the hole formed in the base body and the outer diameter Dp of the pin is 0.96 or more and 0.98 or less.

  The temperature of the base during lighting of the fluorescent lamp is 70 ° C. or higher.

  The rated life time is 10,000 hours.

  The base is press-fitted into the hole formed in the base body in parallel with four metal pins as the pin, and the fluorescent lamp further includes a cover portion engaged with the base body. And an arc tube installed in a hole provided in the cover portion.

  The base body is either black or dark, and the cover portion is white.

  It consists of a base body made of a thermoplastic resin and a pin press-fitted into a hole formed in the base body, and the thermoplastic resin contains 0.1% by weight or more of a black pigment.

  The thermoplastic resin further contains 0 to 3% by weight of a white pigment.

  The thermoplastic resin further contains 5 to 30% by weight of a glass filler.

  An initial pin holding force Fi at which the base body holds the pin when the fluorescent lamp is not used is 0.10 N · m or more and 0.12 N · m or less.

  The pin holding force Fe after use in which the base body holds the pin when the rated life time is lit is 0.08 N · m or more.

  The ratio Fe between the initial pin holding force Fi that holds the pin when the fluorescent lamp lamp is not used and the pin holding force Fe after use that the base holds the pin when the lamp body is lit for the rated life time. / Fi is 0.66 or more.

  The ratio Dh / Dp between the hole diameter Dh of the hole formed in the base body and the outer diameter Dp of the pin is 0.89 or more and 0.99 or less.

  According to the present invention, discoloration due to heat during lighting can be made inconspicuous without using a white pigment.

It is the figure which showed an example of the fluorescent lamp demonstrated in embodiment. It is the figure which isolate | separated and showed the single-piece | mold metal-type fluorescent lamp shown in FIG. 1 to the component to comprise. 2 is a detailed view of a base 110. FIG. It is a figure (graph) showing the outline of the time-dependent change of the pin holding force of a nozzle | cap | die. It is a figure (table | surface) which shows the result tested about the relationship between initial pin holding force Fi and the incidence (%) of the crack at the time of pin insertion. It is a figure (graph) which shows the result tested about the relationship between the initial pin holding force Fi and the incidence (%) of the crack at the time of pin insertion. It is a figure which shows the result of having tested about the pin retention strength Fe (N * m) after use after lighting for 10,000 hours, and the relationship of pin omission | removal at the time of the lamp | ramp attachment / detachment to a receiver, and pin fall generation | occurrence | production. It is a figure (graph) which shows the result tested about the relationship between Dh / Dp and the initial pin retention force Fi (N * m). It is a figure (table | surface) which shows the result tested about the relationship between Dh / Dp and initial pin retention force Fi (N * m). It is the figure (table) which showed the combination of the amount of glass fillers, and the amount of white pigment addition. It is the figure (table) which showed the combination of the amount of glass fillers, and the amount of white pigment addition. It is the figure (table | surface) which showed the result of having measured the pin retention strength in each combination of the Example and comparative example which were shown in FIG. It is the figure (table | surface) which showed the result of having measured the pin holding force in each combination of the Example shown in FIG. It is the figure (table | table | tablet) which showed the crack incidence rate of a nozzle | cap | die, pin omission, and the number of pin collapse occurrence about a typical Example. It is the figure which showed the result of having measured the time-dependent change of the pin retention strength in a typical Example. It is the figure (table) which showed the combination of the amount of carbon black, and the amount of white pigment addition. It is a figure (table | surface) which shows the result of having tested the relationship between the amount of carbon black and discoloration. It is the table | surface which showed the result of having tested the relationship between the amount of carbon black, the initial pin retention strength Fi, and the pin retention strength Fe after use. It is the figure which showed an example of the torque gauge. It is the figure (table | surface) showing an example of the model number of the nozzle | cap | die which can apply this invention.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an example of a fluorescent lamp described in the embodiment.

  FIG. 1 shows a perspective view of a one-piece die fluorescent lamp as an example of the fluorescent lamp.

  FIG. 2 is a diagram showing the single-piece fluorescent lamp shown in FIG. 1 separated into constituent parts. FIG. 2 shows a side view of the component.

  1 and 2, the one-piece base fluorescent lamp has a base 110, a cover part 120, and an arc tube 130.

  Further, in the embodiment, the case where the base body 111 is black or dark (when it is not white) will be described as an example. For this reason, in FIG. 1, the base body 111 is hatched to clearly show that it is colored. In FIG. 2 and FIG. 3 described later, diagonal lines are omitted.

  Next, components will be described.

  The base 110 has a part to be inserted into a metal receiver (an instrument, a lighting apparatus having a socket) and a part to be mated with the cover part 120. The base 110 includes a base body 111 made of a thermoplastic resin and four metal pins 112. In the base body 111, four holes 113 are formed, and a pin 112 is press-fitted into each of the formed four holes 113. In this embodiment, an example of the base 110 having four pins 112 is shown, but the number is not limited to four.

  The cover part 120 is made of a thermoplastic resin and joins the base 110 and the arc tube 130. The cover part 120 has a hole for installing the arc tube 130. Further, the cover part 120 mates with the base 110.

  The arc tube 130 is a part that lights up, and is installed in the cover unit 120. The arc tube 130 is electrically connected by a lead wire (not shown).

  Examples of the thermoplastic resin include PBT (polybutylene terephthalate) and PET (polyethylene terephthalate).

  FIG. 3 is a detailed view of the base 110.

  3A is a front view, FIGS. 3B and 3C are side views, FIG. 3D is a perspective view, and FIG. 3E is a cross-sectional view (a part of the base body 111). Is shown. FIG. 3F shows a side view of the pin 112 (partial cross-sectional view (right side portion of the center line)).

  As shown in FIG. 3, the base body 111 has four metal pins 112 pressed into the base body 111 in parallel two by two.

  FIG. 3E shows a cross-sectional view of a portion of the base body including the hole 113 in the base body 111. The length (diameter) indicated by Dh is the hole diameter of the hole 113 provided in the base body. This corresponds to the diameter of the hole 113.

  In FIG. 3F, the length (diameter) indicated by Dp is the outer diameter of the pin 112. The portion having the outer diameter of Dp includes a portion that contacts the portion of the hole 113 having the hole diameter of Dh. The pin 112 is inserted into the hole 113 formed in the base body 111 and is held by the pressure received from the hole 113.

  The pin holding force is a force (base pin torque) at which the base body 111 holds the pin 112. The pin holding force is indicated by a value of N · m (Newton meter).

  The “initial pin holding force Fi” is a holding force before the fluorescent lamp is used after the metal pin 112 is press-fitted into the base body 111 (when the fluorescent lamp is not used and before the fluorescent lamp is turned on). The initial pin holding force Fi is related to the pin outer diameter Dp and the hole diameter Dh.

  The “pin holding force Fe after use” is a pin holding force that the base body 111 holds the metal pin 112 after the lamp is lit for 10,000 hours.

  The lighting time of 10,000 hours corresponds to the rated life (rated life time) of a typical compact fluorescent lamp FHT57W.

  “Rated life” is the life published based on the average life of lamps of the same type manufactured over a long period of time. As an example, the rated life is obtained by calculating an average value of the lifespan of a continuous repeated test in which a number of lamps are turned on for 2.75 hours and then turned off for 0.25 hours. Thus, not all lamps reach the end of their life when they reach the rated life. In addition, variations occur due to voltage, blinking frequency, manufacturing conditions, and the like.

  “Lifetime” means the total lighting time until the lamp stops lighting when it is lit under specified conditions, or the total luminous flux is 70% of the initial luminous flux (a lamp with a predetermined color rendering property and a compact fluorescent lamp) The lamp is the shorter of the total lighting time until the lamp falls to 60%.

  In addition, when “Pin holding force after use” is simply written (when Fe is not written), the pin holding force after lighting the lamp for a predetermined time is used, and after using the fluorescent lamp for a predetermined time ( This is the holding power after the fluorescent lamp is turned on. The predetermined time is an arbitrary time and includes a rated life and other times (not limited to the rated life).

  FIG. 4 is a diagram (graph) showing an outline of the change over time of the pin holding force of the base.

  The pin holding force in FIG. 4 is a value when the fluorescent lamp shown in FIGS. 1 to 3 is used. Moreover, the temperature of the lamp | cap | die currently turned on becomes 70 degreeC or more in a fluorescent lamp.

  Pattern 1 shows an initial pin holding force Fi of 0.1, pattern 2 shows an initial pin holding force Fi of 0.12, and pattern 3 shows an initial pin holding force Fi of 0.12. This pattern is also a diagram showing an example in which the pin holding force Fe after use (pin holding force after lighting of the rated life) exceeds the lower limit value 0.08. Pattern 3 shows a case where the decrease in pin holding force is larger than those of pattern 1 and pattern 2.

Further, Comparative Example 1 shows an example of a case of the base body 111 including a glass filler 15 wt%, of a white pigment TiO ₂ amount added 5 wt%.

Comparative Example 4 shows an example of the base body 111 including 60% by weight of a glass filler and 5% by weight of white pigment TiO ₂ added.

  In the following description, when the glass filler and the white pigment addition amount are not particularly specified (including cases where they are simply expressed as%), it means that the amount is% by weight with respect to the base body 111.

  The fluorescent lamps of pattern 1, pattern 2, and pattern 3 have the following characteristics.

  The pin 112 that is press-fitted into the base body 111 of the fluorescent lamp comes off at the end of the life and causes problems such as falling over. This is one of the causes that the base body 111 deteriorates due to heat when the fluorescent lamp is turned on. In order to prevent this problem, the occurrence of the problem can be suppressed when the pin holding force Fe after use is 0.08 N · m or more at the end of the life. The initial pin holding force Fi is preferably 0.12 N · m or less, and the pin holding force Fe after use is preferably 0.08 N · m or more.

  From the above results, the Fe / Fi ratio is desirably 0.66 (0.08 / 0.12) or more. Further, in consideration of longer life up to a rated life of 15000 hours of a fluorescent lamp that will be required in the future, the Fe / Fi ratio is 0.80 (0.80 / 0.10 or 0.10 / 0.12) or more is more desirable (see patterns 1 and 2 in FIG. 4). Furthermore, as shown in FIG. 4, when the Fe / Fi ratio is 0.8 or more, a good value is maintained even if the pin holding force Fe after use decreases (rapidly decreases) after the lamp is lit for 15000 hours. Has been. In particular, in the case of the pattern 2 in FIG. 4, 0.08 N · m or more is maintained even after 15000 hours of lighting.

  As the value of the Fe / Fi ratio approaches 1.00, the deterioration of the base body 111 is suppressed.

  Further, since the pin holding force Fe after use does not become a value larger than the initial pin holding force Fi, and the pin holding force deteriorates due to lighting of the lamp, the pin holding force Fe after use becomes the initial value. It can be said that the value is smaller than the pin holding force Fi (the pin holding force Fe after use <the initial pin holding force Fi). Accordingly, the Fe / Fi ratio is less than 1.0. That is, when the desired pin holding force Fe after use is determined, the initial pin holding force Fi needs to be larger than the lower limit value of the desired pin holding force Fe after use.

  As shown in Comparative Example 1 and Comparative Example 4 in FIG. 4, the pin holding force is particularly lowered after the rated life has elapsed, and preventing this reduction leads to the suppression of the malfunction of the fluorescent lamp at the end of the life. Become.

  Therefore, it is desired to suppress a decrease in pin holding power of the fluorescent lamp at the end of life.

  From these, it was found that the ratio Fe / Fi of the initial pin holding force Fi after use of the rated life and the pin holding force Fe after use is preferably 0.66 or more, and particularly preferably 0.80 or more. .

  Next, the base body 111 will be examined.

  It has been found that the base body 111 preferably has a ratio Dh / Dp between the hole diameter Dh and the pin outer diameter Dp of 0.89 or more and 0.99 or less, particularly 0.96 or more and 0.98 or less.

  In the additive contained in the thermoplastic resin of the base body 111, the white pigment is 3% by weight or less, and the glass filler used as the reinforcing agent is 10% by weight or more and 30% by weight or less. Thus, it was found that the pin holding force can be maintained. Moreover, it turned out that it is desirable that a white pigment is 2 weight% or less. Since the addition of the white pigment to the thermoplastic resin causes deterioration, it can be said that the lower limit of the white pigment is 0% by weight or more.

  In addition, it was found that the discoloration due to heat during lighting can be made inconspicuous without using a white pigment because the thermoplastic resin of the base body 111 contains 0.2% by weight or more of a black pigment. . Moreover, the discoloration by heat can be made inconspicuous by adding 0.2 to 1.0 weight% of black pigment content.

  As shown in FIG. 1, the fluorescent lamp has a black or dark base 110 covered with a white cover by making the resin base body 111 black or dark and the resin cover 120 white. Do not touch. For this reason, an external appearance can be maintained white. In addition, even when the base 110 touches the user's eyes when the lamp is attached or detached, the base is black or dark, and the discoloration due to heat at the time of lighting is inconspicuous. Never give to.

  Hereinafter, the test results in Examples 1 to 5 will be described with reference to FIGS.

The method of measuring the cap pin torque was measured using a torque gauge (an example of a measuring device) shown in FIG. The torque gauge shown in FIG. 19 is as follows.
Manufacturing company name Tohnichi Corporation Model name ATG12CN
Specifications 1-12 (cNm) Minimum unit 0.2 (cNm)
As a standard, the four pins are required to be 8.0 (cN · m) (0.08 N · m).

The measuring method is as follows.
(1) Insert the tip of the torque gauge into the pin to be measured, and fix it firmly with the screw.
(2) Set the torque gauge needle to 0 (zero).
(3) Twist the torque gauge body. In FIG. 19, it is twisted in the direction of the arrow.
(4) When the torque reaches the maximum, the pin and the press-fit portion of the base slip, and the needle does not move.
(5) Unscrew the main body and read the value of the needle. To check the holding power of the focus base, measure using torque strength. That is, how much the pin has a holding force is measured and measured as torsion torque and read as data. As a result, the pin holding force is quantified.
(6) The above operations (1) to (5) are performed on other pins.

  The contents described in the above embodiment have been described using the single-piece fluorescent lamp shown in FIGS. 1 to 3, but can also be applied to the fluorescent lamps having the type shown in the table of FIG. 20. Is possible.

  Further, in the embodiment and the examples described below, the case where the base body 111 is made of a thermoplastic resin and the pin 112 is made of metal is described as an example, but is not limited thereto. The base body 111 or the pin 112 made of another material may be used.

  FIG. 5 and FIG. 6 are diagrams showing the results of testing the relationship between the initial pin holding force Fi and the occurrence rate (%) of cracks during pin insertion.

  The test was conducted using the FHT57W lamp as the fluorescent lamp, the GX24q-5 base as the base, and the GX24q-5 as the base as an example. In addition, also about the Example after Example 2 demonstrated below, the test was implemented using the fluorescent lamp of the same shape, a nozzle | cap | die, and a metal receiver.

In the data of FIGS. 5 and 6, the base body 111 uses PBT as an example of a thermoplastic resin. The base body 111 was added with 5% by weight of TiO ₂ (titanium dioxide) as a white pigment. The test was performed by changing the glass filler amount (% by weight) and Dh / Dp to the values shown in the table. By changing at least one of the glass filler amount (% by weight) and Dh / Dp, the initial pin holding force Fi was changed. When the pin 112 was inserted into the base in the production line, the number of cracks per 1,000 bases was counted and indicated as a crack generation rate (%).

  As shown in FIGS. 5 and 6, it was found that when the initial pin holding force Fi exceeds 0.12 N · m (in FIG. 5, Fi is 0.126 or more), the base cracks.

  Therefore, it was found that the initial pin holding force Fi is suitably 0.12 N · m or less.

  FIG. 7 shows the results of testing the relationship between the pin holding force Fe (N · m) after use and the occurrence of pin pull-out and pin collapse when the lamp is attached to and detached from a receiver in a fluorescent lamp that has been lit for 10,000 hours. FIG.

In the data of FIG. 7, the base body 111 uses PBT as an example of a thermoplastic resin. The test was performed by changing the value of the glass filler amount (% by weight), the value of Dh / Dp, and the value of the white pigment addition amount (TiO ₂ ) (% by weight) as shown in FIG. By changing each value, the removal of the pin and the falling of the pin when the lamp was attached to and removed from the receiver when the pin holding force Fe after use was changed were investigated. Twenty lamps after lighting for 10,000 hours were used as samples, and when the lamp was attached to and detached from the receiver ten times, the removal of the pin from the base and the collapse of the pin were counted.

  The removal of the pin means that the pin 112 press-fitted into the hole 113 of the base body 111 is removed.

  The fall of the pin is that the pin is tilted from the base due to the deformation of the hole 113 of the base body 111 in which the pin 112 is inserted. The falling of the pin is a phenomenon different from the turning of the pin itself.

  As shown in FIG. 7, if the pin holding force Fe after use is 0.08 N · m or more, the pin does not come off and the pin falls. It has been found that when the pin holding force Fe after use is smaller than 0.08 N · m, problems such as pin dropout and pin collapse occur.

  FIG. 8 and FIG. 9 are diagrams showing the results of testing the relationship between Dh / Dp and the initial pin holding force Fi (N · m).

8 and 9, the base body 111 uses PBT as an example of a thermoplastic resin. Moreover, the base body 111 did not add TiO ₂ (titanium dioxide) as a white pigment (0 wt%). The test was performed by changing the value of glass filler amount (% by weight) and the value of Dh / Dp as shown in FIG. The initial pin holding force Fi was measured for a plurality of combinations with different values.

  As a test sample, at least one lamp corresponding to each combination of the initial pin holding force Fi and the Dh / Dp ratio was prepared. In the test, the pin holding force (torque) of three pins out of the four pins press-fitted into the lamp corresponding to the above combination was measured.

  When Dh / Dp is 0.96 or more and 0.98 or less, the initial pin holding force Fi is 0.10 N · m when the glass filler amount is 5 wt%, 15 wt%, or 30 wt%. It was within the range of 0.12 N · m or less.

  When Dh / Dp is 0.89 or more and 0.99 or less, the initial pin holding force Fi may not fall within the range of 0.10 N · m or more and 0.12 N · m or less depending on the amount of glass filler. . When Dh / Dp is 0.92 or more and 0.98 or less, the initial pin holding force Fi is within the range of 0.10 N · m or more and 0.12 N · m or less in the case of the glass filler amount of at least two values. Met. When Dh / Dp is 0.94, when the glass filler is 30% by weight, the initial pin holding force Fi is 0.121, which is out of the range with a slight difference from 0.120.

  As shown in FIGS. 8 and 9, Dh / Dp is suitably 0.89 or more and 0.99 or less, and Dh / Dp is 0.92 or more and 0.98 or less, and particularly 0.96 or more and 0.98 or less. Was found to be preferred.

  In Example 4, the result of having tested about the element relevant to pin retention strength at the time of changing the compounding ratio of the material of the nozzle | cap | die main body 111 is shown.

10 and 11 are tables showing combinations of glass filler amounts and white pigment addition amounts. As an example of the white pigment, TiO ₂ was used. The amount of glass filler and the amount of white pigment added are shown as% by weight relative to the base body 111. Moreover, in Example 4, the base body 111 used PBT as an example of a thermoplastic resin.

  Examples 1 to 21 and Comparative Examples 1 to 6 are used as identifiers for identifying the combinations.

  In each of Examples 1 to 21 and Comparative Examples 1 to 6, the base body 111 used PBT as an example of a thermoplastic resin.

  Further, Examples 1 to 17 and Comparative Examples 1 to 6 were tested with Dh / Dp of 0.97, and Examples 18 to 21 were tested with Dh / Dp of 0.85.

  12 and 13 are tables showing the results of measuring the pin holding force in each combination of the example and the comparative example shown in FIGS. 10 and 11.

  At least two lamps corresponding to the respective examples were prepared as test samples. In the test, pin holding force (torque) of three pins out of four pins press-fitted into the lamp was measured. The initial pin holding force Fi and the pin holding force Fe after use were measured using different lamps.

  As shown in FIG. 12, when the glass filler is 5 wt% or more and 30 wt% or less and the white pigment addition amount is 0 wt% or more and 3 wt% or less, the values of Fi, Fe, Fe / Fi are as follows. It becomes a good range.

  Furthermore, it has been found that it is more preferable that the glass filler is 5 wt% or more and 30 wt% or less and the white pigment addition amount is 0 wt% or more and 2 wt% or less. Since the value of Fe / Fi is large, the deterioration of the base body 111 is suppressed, which can be said to be more preferable. From the viewpoint of the value of Fe / Fi, it can be said that it is more preferable that the glass filler is 5 wt% or more and 30 wt% or less and the white pigment addition amount is 0 wt% or more and 1 wt% or less.

  When the glass filler is 5 wt% or more and 30 wt% or less and the white pigment addition amount is 0 wt%, or the glass filler is 5 wt% or more and 15 wt% or less, and the white pigment addition amount is In the case of 1% by weight, the value of Fe / Fi is 0.80 or more, which can be said to be particularly preferable.

  By setting the glass filler amount and the white pigment addition amount within the above ranges, the pin retention force Fe after use can be maintained even when the fluorescent lamp is used beyond the rated life.

  Further, as shown in FIG. 13, in any of the examples shown in FIG. 11, the initial pin holding force Fi is a large value, and the result of FIG. Turned out to be impractical.

  Further, FIG. 14 is a table showing the rate of occurrence of base cracking, the number of pins falling out, and the number of pin collapses for typical examples.

  In FIG. 14, Examples 7, 4, and 17 of FIG. 10 and Comparative Examples 1 and 4 were used. The crack occurrence rate (%) was tested in the same manner as in Example 1, and the test of pin removal and pin collapse was performed in the same manner as in Example 2.

  In Comparative Example 4, the value of Fi exceeds 0.139, which is an appropriate range, and the crack generation rate is high. In Comparative Example 1, the value of Fe is smaller than 0.067 and 0.08, and the number of occurrences of pin dropout and pin collapse is large. In the examples other than the above, the occurrence rate of cracking, pin omission, and the number of pin collapse occurrences are not generated, and it can be said that the pin holding force is sufficient. Therefore, it is considered that the pin holding force of the base 100 is maintained when the rated life is exceeded by using the base body 111 having the composition of the above embodiment.

  FIG. 15 is a diagram showing the results of measuring the temporal change in pin holding force in a typical example. In FIG. 15, Examples 4, 10, and 17 and Comparative Examples 1 and 4 of FIG. 10 were used.

  Since the test was a destructive test, lamps having the number of times to be measured were prepared, and measurement was performed every 1000 hours from the start of the test to 16000 hours. Therefore, at least 16 lamps were prepared, and measurement was performed using three pins among the four pins press-fitted into the lamp.

  In FIG. 15, in Examples 4, 10, and 17, when the lamp is lit for 10,000 hours, the pin holding power is maintained at 0.08 N · m, which is a necessary value, and the lamp is lit for more than 10,000 hours. Even in this case, there is no sudden drop in the pin holding force, suggesting that it can cope with a longer life.

  From FIG. 15, Examples 4, 10, and 17, especially Examples 4 and 10, have a gentler slope of the graph and slower pin holding force reduction speed than Comparative Examples 1 and 4. I understand. In particular, in the case of Example 4, even when the lamp was lit for more than 15000 hours, the pin holding force after use was maintained at 0.08 N · m, and the fluorescence rated life could be extended. When the value of Fi is close to 0.120 N · m, the value of Fe / Fi is large, and the deterioration of pin holding force is suppressed, the necessary pin holding force can be maintained even after lighting for a long time. all right. Therefore, even when the rated life is longer than 10,000 hours (for example, 15000 hours), it can sufficiently cope.

  Thus, by appropriately combining the glass filler amount and the white pigment addition amount, the pin holding force can be maintained, and the life of the lamp can be extended. As shown in FIG. 15, it was found that maintaining the pin holding force can cope with a longer lamp life because there is no sudden drop even when the lighting time exceeds 10,000 hours.

  In Example 5, the results of testing the relationship between the amount of carbon black contained in the base body 111 and discoloration and the relationship between the amount of carbon black and Fi, Fe are shown.

FIG. 16 is a table showing combinations of carbon black amount (also referred to as “carbon amount”) and white pigment addition amount. As an example of the white pigment, TiO ₂ was used. The amount of carbon black and the amount of white pigment added are shown as% by weight with respect to the base body 111. The base body 111 uses PBT as an example of a thermoplastic resin. The base body 111 includes 15% by weight of a glass filler. Dh / Dp was tested using the case of 0.97.

  Examples 3, 7, and 11, Examples 22 to 31, and Comparative Examples 1 and 5 are used as identifiers for identifying the combinations.

  FIG. 17 is a table showing the results of testing the relationship between the amount of carbon black and discoloration. The combination of the amount of carbon black and the amount of white pigment added is as shown in FIG. The test was conducted by having five subjects visually observe the base 100 of the fluorescent lamp. One subject visually observed three samples. “A subject recognizes discoloration” refers to a case where discoloration of at least one of the three samples is recognized.

  When the white pigment addition amount is less than 2% by weight, the carbon black amount is preferably 0.2% by weight or more, and particularly preferably 0.5% by weight or more.

  When the white pigment addition amount is 2% by weight, the carbon black amount is preferably 0.1% by weight or more, and particularly preferably 0.2% by weight or more.

  When the amount of white pigment added was 5% by weight or 10% by weight, no discoloration was observed even if the amount of carbon black was not added.

  FIG. 18 is a table showing the results of testing the relationship between the amount of carbon black, the initial pin holding force Fi, and the pin holding force Fe after use.

  The thermoplastic resin becomes completely black when it contains about 0.5% by weight of carbon black.

  As shown in FIG. 18, when the amount of carbon black is 1.0% by weight, the values of Fi, Fe and Fi / Fe are in an appropriate range. Therefore, it can be said that there is no problem if the amount of carbon black is about 1% by weight.

  The carbon black amount was not adversely affected in the range of 1.0% by weight shown in FIG. 18. However, excessive addition of carbon black is predicted to cause a short circuit due to a reduction in the surface resistance of the die. Is done. For example, when a large amount (for example, 5 to 10% by weight) of carbon black is added, the initial pin holding force Fi is increased, and it is considered that cracks of the die increase during the production.

17 and 18, the white pigment (TiO ₂ is 0 to 2% by weight) in a suitable range in which the deterioration of the base due to lighting does not have a problem at a level where discoloration does not become a problem (in the case of ○ and ● in FIG. 17). It can be said that the amount of carbon black of 0.2% by weight, which is judged to be not preferable in the case of Δ, is preferable.

  Hereinafter, the features of the fluorescent lamp and the base according to the embodiment of the present invention will be described again.

  A fluorescent lamp according to an embodiment of the present invention has a base composed of a base body and a pin that is press-fitted into a hole formed in the base body, and the base body holds the pin when it is lit for a rated lifetime. The pin holding force (base pin torque) Fe after use is 0.08 N · m or more.

  The ratio Fe / Fi of the initial pin holding force Fi for holding the pin to the base body when the fluorescent lamp is not used and the pin holding force Fe after use is 0.66 or more.

  The ratio Fe / Fi between the initial pin holding force Fi and the pin holding force Fe when the base body when the fluorescent lamp is not used holds the pin is 0.8 or more.

  The ratio Dh / Dp between the hole diameter Dh of the hole provided in the base body and the outer diameter Dp of the pin is 0.89 or more and 0.99 or less.

  The ratio Dh / Dp between the hole diameter Dh of the hole provided in the base body and the outer diameter Dp of the pin is 0.96 or more and 0.98 or less.

  The temperature of the base during lighting is 70 ° C. or higher.

  The rated life is 10,000 hours.

  The base body is made of a thermoplastic resin, and four metal pins are press-fitted into the base body in parallel two by two, and are provided in the cover part and mated with the base body. It consists of the arc tube installed in a hole, It is characterized by the above-mentioned.

  The thermoplastic resin contains 0 to 3% by weight of a white pigment and contains 5 to 30% by weight of a glass filler.

  The thermoplastic resin contains a white pigment in an amount of 0% by weight to 2% by weight.

  The thermoplastic resin contains 0.2% by weight or more of a black pigment.

  The black pigment contains carbon black.

  The base body is either black or dark, and the cover portion is white.

  Further, the fluorescent lamp according to the embodiment of the present invention has a base body made of a thermoplastic resin, a base provided with a hole provided in the base body and a pin press-fitted into the hole, and the thermoplastic resin is a white pigment. Is contained in an amount of 0 to 3% by weight, and a glass filler is contained in an amount of 5 to 30% by weight.

  The fluorescent lamp according to the embodiment of the present invention includes a base body and a base made of a pin that is press-fitted into a hole formed in the base body, and the base body before using the fluorescent lamp holds the pin. The ratio Fe / Fi between the initial pin holding force (cap pin torque) Fi and the pin holding force Fe after use in which the base body holds the pin after lighting the rated life time is 0.66 or more. Features.

  The base according to the embodiment of the present invention includes a base body and a pin that is press-fitted into a hole formed in the base body, and the base body holds the pin after use after the base body is lit for the rated life time. The force (cap pin torque) Fe is 0.08 N · m or more.

  The ratio Fe / Fi of the initial pin holding force Fi for holding the pin to the base body when the fluorescent lamp is not used and the pin holding force Fe after use is 0.66 or more.

  The ratio Dh / Dp between the hole diameter Dh of the hole provided in the base body and the outer diameter Dp of the pin is 0.89 or more and 0.99 or less.

  The base body is made of a thermoplastic resin, and the thermoplastic resin contains 0 to 3% by weight of a white pigment and 5 to 30% by weight of a glass filler.

  A base according to an embodiment of the present invention has a base body made of a thermoplastic resin, a base provided with a hole provided in the base body, and a pin press-fitted into the hole, and the thermoplastic resin contains a white pigment. It is characterized by containing 0 to 3% by weight and containing 5 to 30% by weight of a glass filler.

  The ratio Dh / Dp between the hole diameter Dh of the hole provided in the base body and the outer diameter Dp of the pin is 0.89 or more and 0.99 or less.

  Further, the base according to the embodiment of the present invention has a base composed of a base body and a pin that is press-fitted into a hole provided in the base body, and the base body before use of the fluorescent lamp holds the above-mentioned pin. The ratio Fe / Fi between the force (base pin torque) Fi and the pin holding force Fe after use in which the base body holds the pin after lighting the rated life time is 0.66 or more.

  According to a preferred embodiment of the present invention, it is possible to improve the pin holding force of the base body. Therefore, the fluorescent lamp can be lit for a long time.

  Further, since the pin holding force can be improved, the depth of the pin insertion portion can be reduced (the length of the pin can be shortened) when the pin is press-fitted into the base body. As a result, the cost of the pin can be reduced. Further, since the length of the pin is shortened, the working efficiency can be improved in the process of inserting the lead wire.

  110 base, 111 base body, 112 pins, 113 holes, 120 cover part, 130 arc tube.

Claims (17)

It is installed in a base made of a thermoplastic resin, a base made of a pin that is press-fitted into a hole formed in the base body, a cover portion that is fitted into the base body, and a hole provided in the cover portion. The thermoplastic resin contains 0.1% by weight or more of a black pigment, and the base is formed of four metal pins as the pins in parallel on the base body. is pressed into by holes, the base body is either black and dark, the cover part, a fluorescent lamp, wherein a white der Rukoto.   2. The fluorescent lamp according to claim 1, wherein the thermoplastic resin contains 0.2% by weight or more of a black pigment.   2. The fluorescent lamp according to claim 1, wherein the thermoplastic resin contains 0.5% by weight or more of a black pigment.   The fluorescent lamp according to any one of claims 1 to 3, wherein the thermoplastic resin contains carbon black as a black pigment.   The fluorescent lamp according to any one of claims 1 to 4, wherein the thermoplastic resin further contains a white pigment in an amount of 0% by weight to 3% by weight.   The fluorescent lamp according to any one of claims 1 to 4, wherein the thermoplastic resin further contains a white pigment in an amount of 0 wt% to 2 wt%.   The fluorescent lamp according to any one of claims 1 to 4, wherein the thermoplastic resin further contains 0 wt% or more and 1 wt% or less of a white pigment.   The fluorescent lamp according to any one of claims 1 to 7, wherein the thermoplastic resin further contains a glass filler in an amount of 5 wt% to 30 wt%.   9. The initial pin holding force Fi when the base body holds the pin when the fluorescent lamp is not used is 0.10 N · m or more and 0.12 N · m or less. Any one of the fluorescent lamps.   The fluorescent light according to any one of claims 1 to 9, wherein a pin holding force Fe after use in which the base body holds the pin when lit for a rated life time is 0.08 N · m or more. lamp.   The ratio Fe between the initial pin holding force Fi that holds the pin when the fluorescent lamp lamp is not used and the pin holding force Fe after use that the base holds the pin when the lamp body is lit for the rated life time. The fluorescent lamp according to any one of claims 1 to 10, wherein / Fi is 0.66 or more.   The ratio Fe between the initial pin holding force Fi that holds the pin when the fluorescent lamp lamp is not used and the pin holding force Fe after use that the base holds the pin when the lamp body is lit for the rated life time. The fluorescent lamp according to any one of claims 1 to 10, wherein / Fi is 0.8 or more.   The ratio Dh / Dp between the hole diameter Dh of the hole formed in the base body and the outer diameter Dp of the pin is 0.89 or more and 0.99 or less, any one of claims 1 to 12 Or a fluorescent lamp.   The ratio Dh / Dp between the hole diameter Dh of the hole formed in the base body and the outer diameter Dp of the pin is 0.92 or more and 0.98 or less, wherein any one of claims 1 to 12 Or a fluorescent lamp.   The ratio Dh / Dp between the hole diameter Dh of the hole formed in the base body and the outer diameter Dp of the pin is 0.96 or more and 0.98 or less, wherein any one of claims 1 to 12 Or a fluorescent lamp.   The fluorescent lamp according to any one of claims 1 to 15, wherein the temperature of the base during lighting of the fluorescent lamp is 70 ° C or higher.   The fluorescent lamp according to any one of claims 10 to 12, wherein the rated life time is 10,000 hours.