JP4735656B2 - Tube with reflector - Google Patents

Description

  The present invention relates to a tube with a reflector.

  A tube with a reflector, for example, a halogen bulb with a reflector, has a configuration in which a halogen bulb is incorporated in a concave reflector, and is widely used for general illumination such as a spotlight in a commercial facility. Recently, energy saving is demanded for this type of halogen bulb with a reflector. Specifically, it has been proposed to improve the central illuminance of the halogen light bulb with a reflector and to reduce the power consumption accordingly. For example, while adopting a technology for improving the central illuminance for a commercially available halogen bulb with a reflector with a rated power of 65 W, the central illumination is maintained at the same level as that of a halogen bulb with a reflector with a rated power of 65 W. The power consumption is reduced, and a halogen light bulb with a reflector having a rated power of 50 W is provided.

  Here, the halogen light bulb includes a bulb and a filament disposed in the bulb. The more compact the filament, the closer the filament is to a point light source, and the light collection efficiency can be improved in combination with a reflecting mirror. However, generally, when the rated voltage [V], the rated power [W], and the rated life time (for example, 3000 hours) are determined, the strand length and the strand diameter of the tungsten wire constituting the filament are determined. Since it is substantially determined according to the rated voltage, rated power, and rated life time, it is difficult to make the filament compact by simply shortening the wire length, for example.

  The “light collection efficiency” referred to here indicates illuminance [lx / W] per electric power.

  In addition, the relationship between “rated voltage”, “rated power”, and “rated life time” is as follows. That is, when the rated voltage and the rated power are determined, the resistance value of the filament is determined. Therefore, if the wire length is shortened, it is necessary to reduce the wire diameter in order to maintain the resistance value. However, if the wire diameter is reduced, the tungsten wire becomes thinner due to evaporation of tungsten during lighting and the wire tends to be broken, and the life time tends to be shortened. On the other hand, when the strand diameter is increased in order to ensure the lifetime, it is necessary to increase the strand length in order to maintain the resistance value. However, if the strand length is too long, the filament dimensions must be kept within a certain range according to the size of the bulb, etc. Such tension must be reduced, and the mechanical strength of the filament may be weakened and may be broken. Therefore, in order to satisfy the predetermined rated voltage, rated power, and rated life time, the wire length and the wire diameter are substantially uniquely determined.

Therefore, in general, in a halogen bulb having a rated voltage of 100 [V] or more, for example, 110 [V], a double-winding coil is often used for the filament in order to achieve compactness. And as mentioned above, in order to realize the further demand for energy saving, it has been proposed to use a triple wound coil for this filament (see, for example, Patent Document 1).
JP 2001-345077 A

  However, as the coil is triple-turned and the number of turns is increased, the impact resistance is lowered. Therefore, in particular, when providing the triple coil in the bulb, in order to improve the impact resistance, the triple coil is pulled in the longitudinal direction, that is, the tension is applied to the internal lead wire etc. And mechanically connected. However, in such a case, the pitch of the tertiary coil in the triple-winding coil becomes large, and the entire triple-winding coil becomes longer in the longitudinal direction, resulting in a problem that sufficient compactness cannot be obtained.

  The present invention has been made in view of such circumstances, and provides a low-power-consumption reflector-equipped bulb without substantially reducing the central illuminance while sufficiently securing the impact resistance of the filament. For the purpose.

The tube according to claim 1 of the present invention has a rated voltage of 110 [V] including a reflecting mirror and a halogen bulb having a bulb incorporated in the reflecting mirror and having a filament disposed therein. A tube with a reflecting mirror having a rated power of about 50 [W], wherein the filament has a substantially straight double-winding coil portion extending in the optical axis direction of the reflecting mirror, and the double-winding coil When the coil length of the double-winding coil portion of the filament is L [mm] and the coil outer diameter is R [mm], the element wire of the section intersects the optical axis of the reflecting mirror. The outer diameter R of the coil is expressed by coordinates (L, R) (5.50, 1.95), point (7.50, 1.75), point (7.50, 0.95), Within a range surrounded by line segments connecting points (5.50, 1.15) in sequence (however, the above Have a value selected from the distribution including above), the double-wound coil unit, the wire length of 400 [mm] above 500 [mm] within the range, the wire diameter is 0.042 [mm ] In the range of 0.048 [mm] or less, the mandrel diameter of the primary coil is in the range of 0.20 [mm] or more and 0.32 [mm] or less, and the pitch of the primary coil is 0.05 [mm] or more and 0. 0.08 [mm] or less, the secondary coil mandrel diameter is 0.4 [mm] or more and 1.2 [mm] or less, and the secondary coil pitch is 0.5 [mm] or more. 9 [mm] Ru respectively set within the following range.

  In addition, the halogen bulb with a reflector according to the present invention is intended for a rated voltage of 110 [V], that is, one that is lit by a commercial power source. The rated power is “approximately 50 [W]”, but “approximately” here means that the range of the variation is included, and is substantially 46.0 [W] or more and 54.0 [W]. The following ranges are included.

  Further, the halogen light bulb with a reflector according to the present invention has “a linear double-wound coil portion extending in the longitudinal direction of the reflector” in the filament, but “substantially linear” here is strictly In addition to including a straight line shape in a simple sense, it includes, for example, a straight line shape in design but also a bow shape or a meander shape due to manufacturing variations.

  The present invention can provide a low-power-consumption reflector-equipped bulb with almost no reduction in central illuminance while sufficiently securing the impact resistance of the filament.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a halogen lamp 1 with a reflector according to a first embodiment of the present invention is used mainly for general illumination such as a spotlight as an example, and includes a reflector 2. And a halogen lamp 3 having a rated voltage of 110 [V] and a rated power of approximately 50 [W] incorporated in the reflecting mirror 2.

  The reflecting mirror 2 has a base made of hard glass or quartz glass, has an opening 4 for irradiating light at one end, a cylindrical neck 5 at the other end, and a spheroid surface on the inner surface. Alternatively, a reflecting surface 6 of a rotating body composed of a rotating paraboloid surface is formed.

  A front glass 7 is provided in the opening 4 and is fixed by an adhesive 8. As a method for fixing the front glass 7, a known stopper (not shown) may be used instead of the adhesive 8, or the stopper and the adhesive 8 may be used in combination. However, the front glass 7 is not necessarily provided.

  A base 9 attached to a socket (not shown) of a lighting fixture is provided outside the neck portion 5 so as to cover an end portion of the neck portion 5 and is fixed through an adhesive (not shown). ing. On the other hand, a sealing portion 14 to be described later of the halogen light bulb 3 is inserted into the neck portion 5 and is similarly fixed through an adhesive (not shown).

In addition to a metal film such as aluminum or chromium, a multilayer interference film made of silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), magnesium fluoride (MgF), zinc sulfide (ZnS) or the like is formed on the reflecting surface 6. Has been. Moreover, you may form a facet in this reflective surface 6 as needed.

As an example, the reflecting mirror 2 has a maximum outer diameter (aperture) D ₀ of 50 [mm] and a beam angle of a medium angle.

  As shown in FIG. 2, the halogen light bulb 3 includes a bulb 10 made of quartz glass, hard glass, or the like, and a filament 11 disposed inside the bulb 10.

  The bulb 10 is formed so that a chip-off portion 12 which is a residual mark of sealing cut, a substantially cylindrical light emitting portion 13 and a sealing portion 14 formed by a known pinch seal method are successively connected. . A predetermined amount of a halogen substance and a rare gas, or a halogen substance, a rare gas, and a nitrogen gas are sealed in the light emitting unit 13.

  The filament 11 is made of tungsten, and has a double-winding coil portion 15 wound in a substantially circular shape so as to extend in a substantially linear shape, and leg portions 17 formed at both ends via a skip portion 16. Yes. The filament 11 is positioned in the bulb 10 such that a substantially straight double-wound coil portion 15 extends in the direction of the optical axis X (see FIG. 1) of the reflecting mirror 2, and one end portion of each filament 11 It is supported by two internal leads 18, 19 that are electrically and mechanically connected to the part 17.

  Note that the skip portion 16 is a non-light emitting portion, the boundary between the light emitting portion (double winding coil portion 15) and the non-light emitting portion in the filament 11 is clarified, the power consumption of the light emitting portion is stabilized, and the halogen bulb It has a function of suppressing variations in the luminous flux from the filament 11 among the three individuals.

  The other end portions of the internal lead wires 18 and 19 are connected to one end portions of the external lead wires 22 and 23 through metal foils 20 and 21 sealed to the sealing portion 14. As shown in FIG. 1, the other end portions of the external lead wires 22 and 23 are led out from the end face of the sealing portion 14, and the terminal portions 24 and 25 of the base 9 are connected with a fuse or the like as necessary. Are electrically connected to each other.

  Here, as shown in FIGS. 2 and 3, the positional relationship between the double-winding coil portion 15 and the optical axis X of the reflecting mirror 2 is such that the central axis Y in the longitudinal direction of the double-winding coil portion 15 is the reflecting mirror 2. The double-wound coil section 15 and the optical axis X intersect each other so as not to coincide with the optical axis X. That is, the strand of the double-winding coil portion 15 and the optical axis X are directly crossed, and the portion of the double-winding coil portion 15 that intersects the optical axis X here includes a double-winding coil portion. The space of the inner diameter (mandrel diameter of the secondary coil) portion of the double-winding coil portion 15 through which the central axis Y in the longitudinal direction of 15 passes is not included. At that time, as shown in FIG. 2, the longitudinal center axis Z of the bulb 10 and the center axis Y of the double-winding coil portion are substantially aligned with each other, and the longitudinal center axis Z of the bulb 10 is shifted from the optical axis X. Accordingly, the double-winding coil portion 15 may intersect the optical axis X, and although not shown, the optical axis X of the reflecting mirror 2 and the central axis Z in the longitudinal direction of the bulb 10 are substantially matched. The double winding coil portion 15 may be crossed with the optical axis X by shifting the central axis Y of the double winding coil portion 15 from the central axis Z in the longitudinal direction of the bulb 10.

  Further, when the coil length of the double-winding coil portion 15 is L [mm] (see FIG. 3) and the coil outer diameter is R [mm] (see FIG. 3), the coil length L and the coil as shown in FIG. The outer diameter R is a point (5.50, 1.95), a point (7.50, 1.75), a point (7.50, 0.95), a point (5) represented by coordinates (L, R). .50, 1.15) in a range surrounded by line segments (including the above line segment). At that time, as another dimensional parameter in the double-winding coil portion 15, in the halogen bulb 3 having a rated voltage of 110 [V] and a rated power of approximately 50 [W], the double-winding coil portion 15 (in the filament 11). The light emitting part) has a strand length in the range of 400 [mm] to 500 [mm] and a strand diameter in the range of 0.042 [mm] to 0.048 [mm]. . At this time, when the coil length L and the coil outer diameter R are set within the above ranges, the primary coil pitch is within a range where the mandrel diameter of the primary coil is 0.20 [mm] or more and 0.32 [mm] or less. Is in the range of 0.05 [mm] to 0.08 [mm], and the secondary coil mandrel diameter is in the range of 0.4 [mm] to 1.2 [mm]. The pitch is set within a range of 0.5 [mm] or more and 0.9 [mm] or less.

  As described above, according to the configuration of the halogen light bulb 1 with a reflector according to the embodiment of the present invention, the filament 11 has sufficient impact resistance while the double winding coil is used as the filament 11 without using the triple winding coil. The center illuminance of a conventional halogen bulb with a reflector with a rated voltage of 110 [V] and a rated power of 65 [W] can be reduced while ensuring a compact size while maintaining power consumption (rated power) of 50 [W]. A central illuminance of approximately the same level can be secured. In particular, in order to make the filament 11 compact, conventionally, if the coil length L is shortened, the outer diameter R of the coil has to be increased, and for this reason, the impact resistance tends to be significantly reduced. By optimizing the outer diameter R, the coil length L and the outer diameter R can be ensured to ensure the mechanical strength of the entire filament 11 by intersecting the double coil portion 15 with the optical axis X of the reflecting mirror 2. It is possible to prevent the impact resistance from being lowered and to secure a desired central illuminance as described above.

  In addition, when the light distribution characteristics of such a halogen bulb 1 with a reflecting mirror were evaluated, a light distribution characteristic with a clear outline of the irradiated surface was obtained, which is suitable for applications where it is desired to clarify the light and darkness in spatial illumination. is there.

  Next, an experiment was conducted to confirm the operational effect of the halogen light bulb 1 with a reflecting mirror (hereinafter simply referred to as “the product of the present invention”) according to an embodiment of the present invention.

  In the above-described product of the present invention, as shown in Table 1, only the dimension of the double-winding coil portion 15 of the filament 11, that is, the coil length L is within the range of 5.0 [mm] to 8.0 [mm]. In the same manner, five samples (No. 1 to No. 35) with various changes in the coil outer diameter R within the range of 0.70 [mm] or more and 2.30 [mm] or less were prepared, and their centers The illuminance [lx] was measured and the impact resistance was evaluated. The results are shown in Table 1, respectively.

  In the evaluation of “center illuminance”, each sample was lit as rated, and the center illuminance [lx] on the irradiated surface at a distance of 1 [m] from the sample was measured. In Table 1, the value of the central illuminance of each sample is not an absolute value, but the central illuminance (3000 [lx]) of a conventional halogen lamp with a reflector having a rated power of 65 [W] (rated voltage 110 [V]). Is expressed as a relative value where 100 is 100. However, the relative value is an average value of five samples, and the samples indicated by “−” in Table 1 were not evaluated because impact resistance was not obtained as described later. In the evaluation, if the relative value is 95 or more, it can be said that it is practically almost the same as the central illuminance of a conventional halogen lamp with a reflector having a rated power of 65 [W]. Standard.

  The following vibration test was used for the evaluation of “impact resistance”. First, each sample mentioned above is lighted as rated with the base upward. In this state, a force of 0.6 [G] is applied to each sample, and the sample is vibrated for 20 minutes in the range of 10 [Hz] to 100 [Hz]. This operation is repeated 60 times continuously as one time. Then, the presence or absence of breakage of the filament 11 by this vibration test is evaluated. However, if one of the five samples was disconnected, the evaluation was “Yes”.

  In addition, when changing the coil length L and the coil outer diameter R variously as described above, other dimensional parameters (mandrel diameter and pitch) of the double winding coil portion 15 were appropriately set within the above-described range. Normally, when the coil length L is constant, the coil outer diameter R can be increased by reducing the mandrel diameter of the primary coil and increasing the mandrel diameter of the secondary coil. On the other hand, when the coil length L is constant, the coil outer diameter R can be reduced by increasing the mandrel diameter of the primary coil and decreasing the mandrel diameter of the secondary coil.

  The reflecting mirror 2 has a maximum outer diameter (aperture) of 50 [mm] and a beam angle of 20 [°]. The bulb 10 is not formed with a light interference film such as a visible light transmitting infrared reflection film.

  As is clear from Table 1, the coil length L and the coil outer diameter R of the double-wound coil portion 15 in the filament 11 are represented by coordinates (L, R) (5.50, 1.95), point ( 7.50, 1.75), point (7.50, 0.95), point (5.50, 1.15) within the range surrounded by the line segment (however, above the line segment) Values selected from, for example, point (5.50, 1.95), point (5.50, 1.55), point (5.50, 1.15), point (6.00, 1.95). 90), point (5.50, 1.55), point (5.50, 1.15), point (6.00, 1.90), point (6.00, 1.50), point (6) .00, 1.10), point (6.50, 1.85), point (6.50, 1.45), point (6.50, 1.05), point (7.00, 1.80) ), Point (7.00, 1. 0), point (7.00, 1.00), point (7.50, 1.75), point (7.50, 1.35) and point (7.50, 0.95), It was confirmed that the central illuminance is almost the same as the central illuminance of a conventional halogen lamp with a reflector having a rated power of 65 [W], and the impact resistance is sufficiently practical. On the other hand, the point (5.50, 1.95), the point (7.50, 1.75), the point (7.50, 0) in which the coil length L and the coil outer diameter R are represented by coordinates (L, R). .95), a value outside the range surrounded by the line segment connecting the points (5.50, 1.15) in sequence (but not including the line segment), for example, a point (5.00, 2.30). ), Point (5.00, 2.00), point (5.00, 1.60), point (5.00, 1.20), point (5.00, 1.00), point (5. 50, 2.25), point (5.50, 0.95), point (6.00, 2.20), point (6.00, 0.90), point (6.50, 2.15) , Point (6.50, 0.85), point (7.00, 2.10), point (7.00, 0.80), point (7.50, 2.05), point (7.50) , 0.75), point (8.00, 2.00), point (8.00) 1.70), point (8.00, 1.30), point (8.00, 0.90) and point (8.00, 0.70), the filament was broken by the vibration test described above. In some cases, it was confirmed that the central illuminance was considerably lower than the central illuminance of a conventional halogen lamp with a reflector having a rated power of 65 [W]. This is because, especially when the coil length L is 5.00 [mm], the pitch interval of the secondary coil becomes too narrow and the pitch touch is easily performed between the two, resulting in power consumption. This is considered to be because the filament rose excessively and the filament was melted. Also, the coordinates (L, R) are point (5.00, 1.00), point (5.50, 0.95), point (6.00, 0.90), point (6.50, 0.00). 85), point (7.00, 0.80), point (7.50, 0.75), and point (8.00, 0.70), the pitch interval between the primary coil and the secondary coil becomes narrow. This is considered to be because the filament was blown out as described above. However, in these cases, it is considered that the lack of mechanical strength of the filament also has an influence.

  In the embodiment described above, the case where the reflecting mirror 2 has a beam angle of 20 [°] has been described. However, the present invention is not limited to this, and the beam angle is, for example, 7 [°] or more and 13 [°] or less. Even in the case of using a narrow angle or a wide angle of, for example, 26 [°] or more and 44 [°] or less, the same effect as described above can be obtained according to each beam angle.

  The present invention can also be applied to applications where it is necessary to make the filament compact and reduce the power consumption without substantially reducing the central illuminance.

1 is a partially cutaway front view of a halogen bulb with a reflector according to a first embodiment of the present invention. A partially cutaway front view of a halogen bulb that is also used in a halogen bulb with a reflector Front view of filament used in halogen bulb with reflector The figure which represented the relationship between the coil length L and the coil outer diameter R in the filament similarly used for the halogen light bulb with a reflecting mirror by the coordinate (L, R).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Halogen bulb with a reflector 2 Reflector 3 Halogen bulb 4 Opening 5 Neck part 6 Reflecting surface 7 Front glass 8 Adhesive 9 Base 10 Valve 11 Filament 12 Chip-off part 13 Light emitting part 14 Sealing part 15 Double coil part 16 Skip portion 17 Leg portion 18, 19 Internal lead wire 20, 21 Metal foil 22, 23 External lead wire 24, 25 Terminal portion

Claims (1)

A reflector having a rated voltage of 110 [V] and a rated power of approximately 50 [W], comprising a reflector and a halogen bulb having a bulb incorporated in the reflector and having a filament disposed therein. A tube,
The filament has a substantially straight double-winding coil portion extending in the optical axis direction of the reflecting mirror, and the strand of the double-winding coil portion intersects the optical axis of the reflecting mirror,
When the coil length of the double-winding coil portion in the filament is L [mm] and the coil outer diameter is R [mm], the coil length L and the coil outer diameter R are represented by coordinates (L, R). A line segment connecting point (5.50, 1.95), point (7.50, 1.75), point (7.50, 0.95), and point (5.50, 1.15) in sequence. within enclosed (although the line segment including the above) have a value selected from,
The double-winding coil section has a wire length in a range of 400 [mm] to 500 [mm], a wire diameter in a range of 0.042 [mm] to 0.048 [mm], primary The coil mandrel diameter is in the range of 0.20 [mm] to 0.32 [mm], the primary coil pitch is in the range of 0.05 [mm] to 0.08 [mm], the secondary coil The mandrel diameter is set within a range of 0.4 [mm] to 1.2 [mm], and the secondary coil pitch is set within a range of 0.5 [mm] to 0.9 [mm], respectively.
A tube with a reflector.

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