JP4204620B2 - Tube, tube with reflector, and lighting device - Google Patents

Description

  The present invention relates to a tube, a tube with a reflector, and an illumination device, and more particularly to a technique for improving a filament body in a tube.

A halogen bulb with a reflector, which is a kind of tube with a reflector, is a combination of a reflector having a concave reflecting surface and a halogen bulb, and is used for spot lighting in stores, for example. Yes.
The halogen bulb has a configuration in which a filament body is housed in a hermetically sealed bulb. When a halogen bulb is used in combination with a reflecting mirror, the condensing efficiency can be improved by making the filament body as compact as possible and concentrating the light emitting region at the focal position of the reflecting mirror as much as possible. In this case, it is known that reducing the light emitting region particularly in the optical axis direction of the reflecting mirror is effective for improving the light collection efficiency.

  However, generally, when the rated voltage [V], rated power [W], and rated life (for example, 3000 hours) of a halogen bulb are determined, the diameter of the tungsten wire constituting the filament body is The length is substantially determined. Therefore, for example, it is difficult to make the filament body compact by simply reducing the length of the tungsten wire.

  Therefore, in a halogen bulb having a rated voltage of 100 [V] or higher, a double-wound coil is generally used in order to make the filament body compact. Patent Document 1 discloses a halogen light bulb using a triple wound coil as a filament body for further compaction. According to this, if the length of the tungsten wire is the same, the length of the entire coil (coil length) in the optical axis direction of the reflecting mirror can be shortened, thereby improving the light collection efficiency.

However, as the number of coil turns increases, the vibration amplitude of the coil generated when an external force (impact force) is applied to the halogen bulb increases, which causes a problem that the wire is easily disconnected.
As a halogen light bulb that seems to be able to reduce the size of the filament body (shortening the optical axis direction) while solving this problem, Patent Document 2 discloses that a plurality of single coils are entirely connected to the optical axis of the reflecting mirror. There is disclosed a configuration in which each single coil is arranged in such a manner that its coil axis is parallel to the optical axis of a reflecting mirror so as to be symmetrical with respect to the other. As a result, the length corresponding to the plurality of single coils is shortened in the optical axis direction as compared with the case where the single coil is produced, so that the light collection efficiency is improved. In addition, since each coil is single, it is considered that the problem due to the vibration is reduced.

Further, as an improvement, Patent Document 3 discloses a halogen light bulb in which one of the plurality of single coils is arranged in a position parallel to and including the optical axis of the reflecting mirror. Is disclosed.
By the way, due to the diversification of production techniques in store lighting in recent years, there is a tendency for halogen lamps with reflectors to be frequently used. For this reason, further improvement in light collection efficiency is required from the viewpoint of energy saving and the like.
Therefore, the inventors of the present application arrange a plurality of single coils at intervals in a direction intersecting the optical axis of the reflecting mirror, arrange each single coil substantially parallel to the optical axis, and each A filament body was created in which a single coil was formed by winding a wire in a flat cylindrical shape.

According to this, in comparison with a conventional single coil obtained by winding a wire in a cylindrical shape (when the short axis length of the flat tube is equal to the diameter of the cylinder), the wire length per turn If the element wire length of the tungsten wire is the same, the coil length can be shortened, so that the filament body can be further shortened in the optical axis direction and the light collection efficiency is further improved. Expected to be able to. By flattening the coil, the length in the direction intersecting the optical axis of the reflecting mirror is longer than that of the coil wound in a cylindrical shape, but in order to improve the light collection efficiency, it intersects with the optical axis. It is considered that there is no problem because the effect of shortening in the direction of the optical axis is greater than the direction in which it is performed.
JP 2001-345077 A Japanese National Patent Publication No. 6-510881 JP 2002-63869 A

However, as the study progresses, simply replacing the conventional coil wound in a cylindrical shape with a coil wound in a flat cylindrical shape will provide the required light collection efficiency and impact resistance. It turned out not to be obtained.
Therefore, an object of the present invention is to provide a tube that defines an optimum range of the specification of the filament body and has a light condensing property and an impact resistance higher than those of a tube that has been put into practical use. Another object of the present invention is to provide a reflector-equipped tube having such a tube and an illumination device.

In order to achieve the above object, the tube according to the present invention is used by being incorporated in a reflecting mirror having a concave reflecting surface, and has a rated voltage of 100 [V] or more and 150 [V] or less, and a rating. A tube whose electric power is set to 100 [W] or less, comprising a hermetically sealed valve and a filament body provided in the bulb, the filament body having a flat shape having a major axis and a minor axis Three light-emitting portions having a single coil shape wound in a cylindrical shape having a transverse cross section are spaced at equal intervals in a direction perpendicular to the optical axis of the reflecting mirror, and each coil axis is located on the optical axis. In a posture in which the major axes are substantially parallel to each other and arranged symmetrically with respect to the optical axis, in the xy orthogonal coordinate system, the major axis length of the inner periphery of the light emitting unit The flatness [dimensionalless] obtained by dividing the length by the short axis length is taken on the x-axis and between the light emitting parts. When [mm] is taken on the y-axis, the short axis length and the flatness and the interval between the light emitting parts are defined in any one of the following relationships (i) to (v): It is characterized by being.

  (i) When the minor axis length is at least 0.5 mm and the flatness is greater than 1 and less than or equal to 5, the interval between the light emitting portions is a point (1, 1.0) represented by (x, y) coordinates. ), Point (2, 2.3), point (3, 2.6), point (4, 2.7), point (5, 2.7), point (5, 0.3), point (4 , 0.2), the point (3, 0.2), the point (2, 0.3), the point (1, 0.4), and the point (1, 1.0), which are sequentially connected by line segments. Set to the y-coordinate value within the region (including the above line segment, except for x = 1).

  (ii) When the minor axis length is at least 0.4 mm and the flatness ratio is greater than 1 and less than or equal to 5, the interval between the light emitting portions is a point (1, 0.7) represented by (x, y) coordinates. ), Point (2, 1.9), point (3, 2.2), point (4, 2.3), point (5, 2.4), point (5, 0.3), point (4 , 0.23), the point (3, 0.25), the point (2, 0.4), the point (1, 0.6), and the point (1, 0.7), which are sequentially connected by line segments. Set to the y-coordinate value within the region (including the above line segment, except for x = 1).

  (iii) When the minor axis length is at least 0.3 mm and the flatness is greater than 1 and less than or equal to 5, the interval between the light emitting portions is represented by (x, y) coordinates (1.33, 0 .83), point (2,1.5), point (3,1.9), point (4,2.0), point (5,2.1), point (5,0.3), point (4, 0.25), point (3, 0.3), point (2, 0.5), and point (1.33, 0.83) are sequentially connected by a line segment (in the above-described region). Y coordinate value is included).

  (iv) When the minor axis length is at least 0.2 mm and the flatness is greater than 1 and less than or equal to 5, the distance between the light emitting portions is expressed by a point (1.65, 0.88), point (2, 1.2), point (3, 1.6), point (4, 1.8), point (5, 1.9), point (5, 0.3), Point (4, 0.28), point (3, 0.35), point (2, 0.6), point (1.65, 0.88) are connected in sequence by a line segment ( Y coordinate value is included).

  (v) When the minor axis length is at least 0.1 mm and the flatness is greater than 1 and less than or equal to 5, the interval between the light emitting parts is expressed by (x, y) coordinates (1.89, 0) .82), point (2, 1.2), point (3, 1.6), point (4, 1.8), point (5, 1.9), point (5, 0.3), point (4, 0.28), the point (3, 0.35), the point (2, 0.6), and the point (1.89, 0.82) are sequentially connected by a line segment (in the above-described region). Y coordinate value is included).

In order to achieve the above object, the tube according to the present invention is used by being incorporated in a reflecting mirror having a concave reflecting surface, and the rated voltage is 100 [V] or more and 150 [V] or less. And a rated bulb having a rated power of 100 [W] or less, including a hermetically sealed valve and a filament body provided in the bulb, the filament body having a major axis and a minor axis. The three light emitting portions having a single coil wound in a cylindrical shape having a flat cross section having an equal interval in a direction orthogonal to the optical axis of the reflecting mirror, and each coil axis is In a posture that is substantially parallel to the optical axis and in which the long axes are substantially parallel to each other, the optical axis is symmetrical with respect to the optical axis, and in the xy orthogonal coordinate system, the long axis of the inner periphery of the light emitting unit The flatness [dimensionalless] obtained by dividing the length by the short axis length is taken on the x axis, and the light emitting unit When the interval [mm] is taken on the y-axis, the short axis length and the flatness and the interval between the light emitting parts are defined as any one of the following relationships (i) to (v) It is characterized by being.

  (i) When the minor axis length is 0.5 mm and the flatness is greater than 5 and less than or equal to 8, the distance between the light emitting portions is represented by (x, y) coordinates (5, 2.7) , Point (6, 2.6), point (7, 2.5), point (8, 2.3), point (8, 0.9), point (7, 0.6), point (6, 0.4), the point (5, 0.3), and the point (5, 2.7) are sequentially connected by the line segment (including the above line segment, except for x = 5). )).

  (ii) When the minor axis length is 0.4 mm and the flatness is greater than 5 and less than or equal to 8, the distance between the light emitting portions is represented by (x, y) coordinates (5, 2.4) , Point (6, 2.4), point (7, 2.3), point (8, 2.2), point (8, 0.8), point (7, 0.55), point (6, 0.39), the point (5, 0.3), and the point (5, 2.4) are connected by the line segment in order (including the above line segment, except for x = 5). )).

  (iii) When the minor axis length is 0.3 mm and the flatness is greater than 5 and less than or equal to 8, the distance between the light emitting parts is represented by (x, y) coordinates (5, 2.1) , Point (6, 2.2), point (7, 2.2), point (8, 2.1), point (8, 0.7), point (7, 0.5), point (6, 0.38), the point (5, 0.3), and the point (5, 2.1) are sequentially connected by the line segment (including the above line segment, except for x = 5). )).

  (iv) When the minor axis length is 0.2 mm and the flatness is greater than 5 and less than or equal to 8, the distance between the light emitting parts is represented by (x, y) coordinates (5, 1.9) , Point (6, 2.0), point (7, 2.0), point (8, 2.0), point (8, 0.6), point (7, 0.45), point (6, 0.37), the point (5, 0.3), and the point (5, 1.9) are sequentially connected by the line segment (including the above line segment, except for x = 5). )).

  (v) When the minor axis length is 0.1 mm and the flatness is greater than 5 and less than or equal to 8, the distance between the light emitting parts is represented by (x, y) coordinates (5, 1.6) , Point (6, 1.7), point (7, 1.8), point (8, 1.8), point (8, 0.5), point (7, 0.4), point (6, 0.35), point (5, 0.3), and point (5, 1.6) are connected by a line segment in order (including the above line segment, except for x = 5). )).

In order to achieve the above object, a tube with a reflector according to the present invention includes a reflector and the tube incorporated in the reflector.
In order to achieve the above object, an illuminating device according to the present invention is characterized by having a luminaire having a reflecting mirror, and the above-described tube incorporated in the reflecting mirror.
In order to achieve the above object, an illuminating device according to the present invention includes a luminaire and the bulb with a reflector attached to the luminaire.

In the present invention, the “flat cross section having a short axis and a long axis” includes shapes as described below. The shape will be described with reference to FIG. In FIG. 10, the symbol “SX” is assigned to the minor axis, the symbol “LX” is assigned to the major axis, and the central axis (ie, the coil axis) substantially orthogonal to both the minor axis and the major axis “ "CX" is attached respectively.
(I) As shown in FIG. 4A, when viewed from the coil axis CX direction, the track shape, that is, two parallel line segments and their respective ends connected by a substantially semicircle (ii) ) As shown in the figure (b), when viewed from the direction of the coil axis CX, a shape obtained by crushing a circle (iii) As shown in the figure (c), as seen from the direction of the coil axis CX, Substantially elliptical shape (iv) As shown in FIG. 4D, the shape is substantially rectangular when viewed from the coil axis CX direction. However, the four corners are rounded for processing.

  (V) Other than the coil axis CX direction, a shape similar to the above (i) to (iv). For example, in (i) above, as shown in (e) in the figure, even if two parallel line segments are curved inward, they are included in a shape similar to (i) above. In addition, here, the deformed shapes (i) to (iv) described above due to processing variations are also included.

According to the tube according to the present invention, it is possible to obtain light condensing performance and impact resistance higher than those of a conventional tube including a filament body formed of a practically used double wound filament coil.
Moreover, according to the tube with a reflecting mirror and the illumination device according to the present invention, the light condensing property and the impact resistance more than those having the conventional tube can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a partially cutaway view showing a schematic configuration of lighting apparatus 10 according to Embodiment 1. FIG. In all the drawings including FIG. 1, the scales between the members are not unified.
The illumination device 10 is used as a spotlight in a house, a store, a studio, or the like, for example. The lighting device 10 includes a lighting fixture 12 and a halogen bulb 14 shown as an example of a tube.

The lighting fixture 12 includes a bottomed cylindrical tool body 16 and a reflecting mirror 18 housed in the tool body 16.
A receiver (not shown) for attaching a base 30 (see FIG. 2) of the halogen light bulb 14 is provided at the bottom of the instrument body 16. Note that the instrument body 16 is not limited to a cylindrical shape, and may have various known shapes.

The reflecting mirror 18 can be attached to and detached from the instrument body 16 so that the halogen bulb 14 can be replaced.
The reflecting mirror 18 has a hard glass substrate 20 having a funnel shape. A multilayer interference film 22 constituting a reflection surface is formed on a concave surface portion 20A formed on a spheroidal surface or a paraboloid of the substrate 20. The multilayer interference film 22 can be formed of silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), magnesium fluoride (MgF), zinc sulfide (ZnS), or the like, in addition to a metal film such as aluminum or chromium. The opening diameter (mirror diameter) of the reflecting mirror 18 is 100 mm. In addition, you may form a facet in a reflective surface as needed.

The reflecting mirror 18 has a front glass 24 provided at the opening of the base 20. In this example, the front glass 24 is fixed to the base 20, and the base 20 is configured to be detachable from the instrument body 16 for replacement of the halogen light bulb 14. However, the present invention is not limited to this. The front glass may be fixed to the main body and the front glass may be detachable from the base.
The halogen light bulb 14 is attached to the receiver (not shown) and incorporated in the reflecting mirror 18 for use. In the assembled (attached) state, a central axis B of a bulb 26 described later of the halogen bulb 14 and an optical axis R of the reflecting mirror 18 are positioned substantially coaxially. The halogen light bulb 14 is a light bulb having a rated voltage of 100 [V] or more and 150 [V] or less and a rated power of 100 [W] or less.

FIG. 2 shows a partially cutaway front view of the halogen bulb 14.
The halogen light bulb 14 includes a bulb 26 that is hermetically sealed, and an E-type base 30 that is fixed to the sealing portion 38 side of the bulb 26 with an adhesive 28.
The valve 26 is formed by a tip-off portion 32 that is a residual mark of sealing cut, a filament body housing portion 34 that houses a filament body 60 and the like to be described later, a substantially cylindrical tube portion 36, and a known pinch seal method. The sealing portions 38 are connected in this order.

  As shown in FIG. 2, the filament body storage portion 34 has a substantially spheroid shape. The "substantially spheroid shape" mentioned here means not only including a complete spheroid shape, but also including a shape deviated from the complete spheroid shape by the amount of variation in processing of the glass. Yes. The filament body storage portion is not limited to the shape described above, and may be, for example, a substantially cylindrical shape, a substantially spherical shape, or a substantially complex ellipsoidal shape.

Further, the structure of the valve is not limited to the one described above, and for example, a tip-off part (which may not be provided in some cases), a filament body housing part, and a sealing part may be connected in this order.
An infrared reflecting film is formed on the outer surface of the filament body storage portion 34. However, this infrared reflective film is not necessarily required, and is appropriately formed.

A predetermined amount of halogen substance and rare gas are sealed in the bulb 26. In addition to this, nitrogen gas may be sealed.
The halogen substance is for returning tungsten, which is a constituent material evaporated from the filament body 60 to the filament body 60 again by the halogen cycle during lighting, and preventing the bulb 26 from being blackened. The concentration of the halogen substance is preferably in the range of 10 [ppm] to 300 [ppm]. In order to activate the halogen cycle, the coldest spot temperature on the inner surface of the bulb 26 is preferably 200 [° C.] or higher. Furthermore, in order for the halogen cycle to function properly, the oxygen concentration in the bulb 26 is preferably set to 100 [ppm] or less.

As the rare gas, krypton gas is preferably used. In order to make the filament body 60 compact for the purpose of increasing the light collection efficiency by using krypton gas, an arbitrary place between the adjacent light emitting parts is used although the light emitting parts are arranged close to each other as described later. Thus, it is possible to obtain an effect of suppressing the occurrence of arc discharge during lighting and disconnection.
In particular, the filled gas contains nitrogen gas and a halogen substance mainly composed of krypton, and the gas pressure in the bulb 26 at normal temperature may be set within a range of 2 [atm] to 10 [atm]. preferable. If the gas pressure exceeds 10 [atm], if the bulb 26 is damaged, the luminaire 12 may be damaged by scattered pieces. On the other hand, if it is less than 2 [atm], the filament body 60 This is because tungsten, which is a constituent material, easily evaporates, and the lamp life is shortened. In other words, since the gas pressure is moderately suppressed in the above range of gas pressure, even if the bulb 26 is broken, fragments are not scattered at such a moment that the lighting fixture 12 is broken, and Since the gas pressure is moderately high, tungsten, which is a constituent material of the filament body 60, is difficult to evaporate, and a long life can be realized. Further, arc discharge occurs at any place between adjacent light emitting portions at the time of lighting. It is the range which can suppress generating and disconnecting.

  Moreover, when nitrogen gas is included in the sealed gas, the composition ratio of the nitrogen gas is preferably set in the range of 8 [%] to 40 [%]. If the composition ratio of nitrogen gas exceeds 40 [%], the heat generated in the filament body 60 during lighting is excessively released through the nitrogen gas, and the efficiency may be reduced. On the other hand, less than 8 [%] This is because arc discharge is likely to occur between adjacent light emitting portions during lighting, and disconnection is likely to occur. In other words, since the composition ratio of nitrogen gas is moderately suppressed, the composition ratio range of nitrogen gas is efficient because heat generated in the filament body 60 during lighting is excessively released through the nitrogen gas. In this range, it is possible to prevent the occurrence of a decrease in arc current and the occurrence of arc discharge between adjacent light-emitting portions during lighting and suppression of disconnection because nitrogen gas is appropriately contained.

A pair of metal foils 40 and 42 are sealed in the sealing portion 38. The metal foils 40 and 42 are made of molybdenum. In addition, in order to prevent the airtightness of the valve 26 from being impaired due to overheating of the metal foils 40 and 42 sealed to the sealing portion 38, the surface of the sealing portion 38 is made uneven. It is preferable to increase the surface area and improve the heat dissipation at the sealing portion 38.
One end portion of the external lead wire 44 is joined to one end portion of the metal foil 40, and one end portion of the external lead wire 46 is joined and electrically connected to one end portion of the metal foil 42. The external lead wires 44 and 46 are made of tungsten. The other end portions of the external lead wires 44 and 46 are led out of the valve 26 and are electrically connected to the terminal portions 48 and 50 of the base 30, respectively.

  Here, a fuse (not shown) is provided between at least one of the two external lead wires 44 and 46 and the corresponding terminal portion (48 or 50) of the base 116. Is preferred. By providing the fuse, even if a break occurs in the light emitting part and an arc discharge occurs at the disconnection point, the fuse is immediately blown and the continuation of the arc discharge is stopped, and the arc discharge is interrupted. 26 can be prevented from being damaged. In particular, when a plurality of light emitting portions are arranged close to each other, it is preferable to provide a fuse between each of the external lead wires 44 and 46 and the corresponding terminal portions 48 and 50 of the base 116. In this case, there is a possibility that arc discharge may occur between adjacent light emitting units even if arc discharge due to disconnection in the light emitting unit does not occur.

  One end portion of the internal lead wire 52 is joined to the other end portion of the metal foil 40, and one end portion of the internal lead wire 54 is joined and electrically connected to the other end portion of the metal foil 42. The internal lead wires 52 and 54 are made of tungsten. One end portions of the internal lead wires 52 and 54 are supported by the sealing portion 38 of the valve 26. The internal lead wires 52 and 54 supply external power supplied to the filament body 60 via the base 30 and serve as a support member that directly supports a part of the filament body 60.

3 is a perspective view showing a support structure that supports the filament body 60, and FIG. 4 is a perspective view showing a state in which the filament body 60 is supported by the support structure.
As shown in FIG. 3, there are other support members 56 and 58 as support members that directly support a part of the filament body 60. The support lines 56 and 58 are made of tungsten.
The internal lead wires 52 and 54 and the support wires 56 and 58 are sandwiched between a pair of cylindrical stem glasses 57 and 59. As a result, the support wires 56 and 58 are supported, and the relative positions between the internal lead wires 52 and 54 and the support wires 56 and 58 are maintained.

As shown in FIG. 4, the filament body 60 is composed of a plurality (three in this example) of filament coils 62, 64 and 66. The filament coils 62, 64, 66 are made by winding a tungsten wire as will be described later.
Each of the internal lead wires 52 and 54 and the support wires 56 and 58 is inserted into one of the end portions of the filament coils 62, 64 and 66 to support any of the filament coils 62, 64 and 66. It has one or two portions bent in a “U” shape (hereinafter, this portion is referred to as a “coil support portion”).

Here, the filament coil 62 is supported by the coil support portion 52 </ b> A of the internal lead wire 52 and the coil support portion 56 </ b> A of the support wire 56.
The filament coil 64 is supported by a coil support portion 56B of the support wire 56 and a coil support portion 58A of the support wire 58.
The filament coil 66 is supported by a coil support portion 58B of the support wire 58 and a coil support portion 54A of the lead wire 54.

  Further, since both the support lines 56 and 58 are formed by bending one tungsten wire, the coil support parts 56A and 56B in the support line 56 are connected to each other, and the coil support parts 58A and 58B in the support line 58 are connected to each other. Are connected. Therefore, the filament coils 62, 64, and 66 are electrically connected in series while being attached to the internal lead wires 52 and 54 and the support wires 56 and 58.

  In the state shown in FIG. 4, when power is supplied from the internal lead wires 52, 54, the filament coils 62, 64, 66 do not emit light at the portion where the coil support portion is inserted (non-light emitting portion), and between the coil support portions. Flashes on. Here, the portions between the coil support portions (that is, the portions that emit light) in the filament coils 62, 64, and 66 are defined as the light emitting portions 62A, 64A, and 66A, respectively. That is, the filament body 60 has a plurality of (in this example, three) light emitting portions 62A, 64A, 66A in a single coil shape.

In addition, one column body in which the light emitting units 62A, 64A, and 66A are viewed as a unit, that is, in this example, a column body that connects the four corners of each of the light emitting units 62A, 64A, and 66A (in this example, a prismatic column body). ) Region is a light emitting region LA in the filament body 60. Since it becomes complicated to fill in FIG. 4, a region corresponding to the light emitting region LA is shown by a one-dot chain line in FIG.
With the halogen bulb 14 attached to the luminaire 12 (FIG. 1), the shapes of the related members of the halogen bulb 14 and the luminaire 12 are such that the light emitting area LA is positioned so as to contain the focal point of the reflector 18. And dimensions are defined (designed). Here, “includes the focal point” means that the focal point is located inside or on the surface of the column of the light emitting region LA having a columnar shape. In this example, the center point of the light emitting area LA (the center point of the light emitting portion 64A) is at a position that substantially coincides with the focal point of the reflecting mirror 18. That is, the filament coil 64 is arranged so that the coil axis of the filament coil 64 substantially coincides with the optical axis of the reflecting mirror. Hereinafter, the filament coil 64 may be referred to as a center coil 64, and the filament coils 62, 66 disposed on both sides in the short axis direction may be referred to as side coils 62, 66. The light emitting part 64A of the center coil 64 may be referred to as a center light emitting part 64A, and the light emitting parts 62A, 66A of the side coils 62, 66 may be referred to as side light emitting parts 62A, 66A.

  Here, as described above, it is important to reduce the light emitting region as much as possible and concentrate it on the focal position of the reflecting mirror in order to improve the light collection efficiency. However, when the rated voltage [V], rated power [W], and rated life (for example, 3000 hours) of the halogen bulb are determined, the wire diameter and length of the tungsten wire constituting the filament coil are substantially reduced accordingly. As described above, for example, it is difficult to reduce the light emitting region by simply reducing the length of the tungsten wire.

That is, defining the rated voltage and the rated power is nothing other than defining the strand diameter and effective length of the tungsten wire. Here, the effective length means the total of the wire lengths of the tungsten wire portions constituting the light emitting portions 62A, 64A, 66A.
Specifically, for example, the relationship between the rated voltage [V] and the rated power [W] and the strand diameter and effective length of the tungsten wire is as follows.

(i) When the rated voltage is 110 [V] and the rated power is 65 [W], the strand diameter of the tungsten wire is 0.045 [mm] to 0.065 [mm], and the effective length is 500 [mm] to 600. It is determined in the range of [mm].
(ii) When the rated voltage is 110 [V] and the rated power is 55 [W], the strand diameter of the tungsten wire is 0.04 [mm] to 0.06 [mm], and the effective length is 450 [mm] to 550. It is determined in the range of [mm].

(iii) When the rated voltage is 110 [V] and the rated power is 50 [W], the strand diameter of the tungsten wire is 0.035 [mm] to 0.055 [mm], and the effective length is 400 [mm] to 500 It is determined in the range of [mm].
(iv) When the rated voltage is 110 [V] and the rated power is 40 [W], the strand diameter of the tungsten wire is 0.03 [mm] to 0.05 [mm], and the effective length is 380 [mm] to 480. It is determined in the range of [mm].

(v) When the rated voltage is 110 [V] and the rated power is 30 [W], the strand diameter of the tungsten wire is 0.022 [mm] to 0.042 [mm], and the effective length is 350 [mm] to 450. It is determined in the range of [mm].
(vi) When the rated voltage is 120 [V] and the rated power is 65 [W], the strand diameter of the tungsten wire is 0.04 [mm] to 0.06 [mm], and the effective length is 510 [mm] to 610. It is determined in the range of [mm].

(vii) When the rated voltage is 120 [V] and the rated power is 55 [W], the strand diameter of the tungsten wire is 0.03 [mm] to 0.05 [mm], and the effective length is 460 [mm] to 560. It is determined in the range of [mm].
(viii) When the rated voltage is 120 [V] and the rated power is 50 [W], the strand diameter of the tungsten wire is 0.033 [mm] to 0.053 [mm], and the effective length is 410 [mm] to 510. It is determined in the range of [mm].

(ix) When the rated voltage is 120 [V] and the rated power is 40 [W], the strand diameter of the tungsten wire is 0.025 [mm] to 0.045 [mm], and the effective length is 390 [mm] to 490. It is determined in the range of [mm].
(x) When the rated voltage is 120 [V] and the rated power is 30 [W], the strand diameter of the tungsten wire is 0.02 [mm] to 0.04 [mm], and the effective length is 355 [mm] to 455. It is determined in the range of [mm].

  As described above, since the effective length of the tungsten wire is inevitably determined, the inventor of the present application makes the filament coils 62, 64, 66 (light emitting portions 62A, 64A, 66A) flat as shown in FIG. This is a single coil wound in a cylindrical shape (hereinafter abbreviated as “flat coil”). By doing so, compared to a conventional single coil wound in a cylindrical shape (hereinafter abbreviated as “cylindrical coil”), the short axis length of the flat tube and the diameter of the cylinder are equal. If the wire length of the tungsten wire is the same, the coil length can be shortened so that the length of the light emitting region in the optical axis direction of the reflecting mirror can be reduced. Reduction can be achieved. By flattening the coil, the length in the direction intersecting the optical axis of the reflecting mirror is longer than that of the coil wound in a cylindrical shape, but in order to improve the light collection efficiency, it intersects with the optical axis. There is no problem because the effect of shortening in the direction of the optical axis is greater than the direction in which it is performed.

The filament coils 62, 64, and 66 which are flat coils are manufactured as follows.
That is, as shown in FIG. 5, after winding the tungsten wire 70 around the outer periphery of a plurality of cylindrical core wires (mandrels) 68 (three in the illustrated example) arranged in parallel and in close contact with each other. Then, the core wire 68 is removed. Alternatively, the core wire 68 may be dissolved and removed.

  FIG. 6 is a schematic view of the filament coils 62, 64, 66 attached to the internal lead wires 52, 54 and the support wires 56, 58 as seen from the longitudinal direction (coil axis direction). 6 is used for the purpose of explaining the shape of the filament coils 62, 64, 66, etc., the internal lead wires 52, 54 and the support wires 56, 58 are not shown in the drawing.

  Since the filament coils 62, 64, and 66 have the same shape, the filament coil 62 will be described as a representative. The filament coil 62 has a so-called (track and field) track shape in which corresponding ends of two line segments arranged in parallel are connected by a semicircle when viewed from the longitudinal direction. This shape is derived from the above-described manufacturing method, and the flatter track shape is obtained as the number of the core wires 68 is increased. That is, the degree of flatness (flatness) can be adjusted by the number of core wires 68.

  Here, the flatness is defined as a value obtained by dividing the length of the long axis LX in the inner periphery of the filament coil by the length of the short axis SX. In this example, the flatness is an integer value because of the above manufacturing method. Further, the interval between the filament coils (between the light emitting portions) (hereinafter referred to as “coil interval (light emitting portion interval)”) is defined as the shortest distance (d1) between the outer periphery of the adjacent filament coils. In this example, the filament coils 62, 64, and 66 are arranged so that the major axes LX of the filament coils 62, 64, and 66 are substantially parallel and the minor axis SX is substantially coaxial. The distance (d1) between the coils is a distance as illustrated. The flat shape of the filament coil is not limited to the track shape described above, and may be an elliptical shape, for example. In short, any shape may be used as long as it has a major axis and a minor axis that are orthogonal to each other and is symmetrical with respect to these two axes. In this sense, for example, a rectangular shape may be used. Further, the flatness is not limited to an integer, and can be an arbitrary decimal number.

  In the halogen light bulb having the above-described configuration, if the size and shape of each filament coil 62, 64, and 66 (that is, the short axis length and flatness) are the same, the shorter the coil interval is, the light emitting area LA becomes. Since the light is concentrated on the focal point of the reflecting mirror, the light collection efficiency is increased (light collection performance is improved), while the impact resistance is deteriorated. Here, “impact resistance” refers to the difficulty of occurrence of disconnection in the filament body when a predetermined impact force is applied to the halogen light bulb in the lit state. It is considered that there are two types of mechanisms that cause disconnection, which will be described later.

The inventor of the present application produced light bulbs having different coil intervals in each of the halogen bulbs obtained by variously combining the short axis length and the flatness ratio, and conducted tests on the light condensing property and the impact resistance.
The combinations of minor axis length and flatness were as follows. In other words, the minor axis length is 0.1 [mm], 0.2 [mm], 0.3 [mm], 0.4 [mm], and 0.5 [mm], and the flatness is , 1, 2, 3, 4, 5, 6, 7, and 8 were combined without omission. That is, 40 (= 5 × 8) combinations were used. Then, for each of the 40 combinations, ones having different coil intervals were produced and used for the test. Hereinafter, the halogen bulb subjected to the test is simply referred to as “test bulb”. In addition, the strand diameter of the tungsten wire in the test bulb was set to 0.056 [mm], the effective length was set to 539 [mm], and the coil pitches were all set to substantially the same pitch (0.08 [mm]).

  Evaluation of light collecting property was performed as follows. The halogen light bulb attached was removed from the halogen light bulb with a reflector that was put into practical use (manufactured by Matsushita Electric Industrial Co., Ltd., product number JDR110V65WKN / 5E11), and the test light bulb was attached and used for the test. The light source was turned on at a rated voltage of 110 [V] and a rated power of 65 [W], and the central illuminance [lx] on the irradiated surface at a distance of 1 [m] from the halogen bulb with a reflector was measured. Then, for each of the 40 combinations, a boundary of the coil interval (light emitting unit interval) that is equal to or greater than the central illuminance (hereinafter referred to as “reference illuminance”) of the above-mentioned halogen lamp with a reflector is defined. did.

In addition, the halogen light bulb attached to the halogen light bulb with a reflector of the above product number has a common double-coil filament body as a halogen light bulb.
The impact resistance was evaluated as follows. With the halogen bulb with a reflector turned on, an impact force with an acceleration of 40 [G] was applied from the direction orthogonal to the optical axis of the reflector, and the presence or absence of breakage in the filament body was examined. Those that withstood the impact force of 10 times and did not break were accepted, and those that were broken between 1 and 10 times were rejected. And the boundary of the coil interval (light emission part space | interval) which becomes a pass was defined for every 40 said combinations. Incidentally, as a matter of course, the halogen bulb with a reflector of the above-mentioned product number passes the impact test.

The test results are shown in FIG.
FIG. 7 is an xy orthogonal coordinate system in which the flatness is taken on the x-axis (horizontal axis) and the coil interval (light emitting unit interval) is taken on the y-axis (vertical axis). The plot point symbols in the figure are used properly according to the short axis length of the filament coil. Short axis length = 0.1 is diamond "◆, ◇", short axis length = 0.2 is square "■, □", short axis length = 0.3 is triangle "▲, △", short axis Length = 0.4 is plotted with circles “●, ○” and minor axis length = 0.5 with inverted triangles “▼, ▽”. For the use of black and white, the black symbols indicate the points on the boundary relating to the light condensing property, and the white symbols indicate the points on the boundary relating to the impact resistance. In addition, plot points having the same symbol are sequentially connected by line segments in the horizontal axis direction.

Here, a line segment sequence in which the short axis length = 0.1 and the points “♦” on the boundary line regarding the light condensing property are sequentially connected is referred to as a line C1. Hereinafter, similarly, the line segments corresponding to the minor axis length = 0.2, 0.3, 0.4, and 0.5 will be referred to as line C2, line C3, line C4, and line C5, respectively. To do.
In addition, a line segment sequence formed by sequentially connecting points “◇” on the boundary line regarding impact resistance with the short axis length = 0.1 is referred to as a line S1. Hereinafter, similarly, the line segments corresponding to the minor axis length = 0.2, 0.3, 0.4, and 0.5 are referred to as line S2, line S3, line S4, and line S5, respectively. To do.

FIG. 8 is a list showing the y-coordinate values of the plot points in FIG.
First, the light collecting property will be described with reference to FIG.
For example, in a test bulb with a short axis length of 0.5 [mm], a coil interval (light emitting unit interval) that falls in an area above the line C5 is lower than the reference illuminance, and an area below the line C5 ( Those entering (including the line C5) are equal to or higher than the reference illuminance.

  In the line C5, the coil interval increases as the flatness increases to 2 and 3. The increase in the flatness can shorten the overall length of the coil (the entire length of the light-emitting portion) and improve the light condensing performance. This is because the reference illuminance can be obtained even if the distance d1 (FIG. 6) between the side coils 62 and 66 (side light emitting portions 62 and 66) with respect to the (center light emitting portion 64A) is not so narrow.

  However, the line C5 is descending to the right since the aspect ratio exceeds 4,5. This is considered to be due to the following reasons. An increase in flatness means that the overall length of the coil (the entire length of the light emitting portion) is shortened, while the length in the major axis direction is increased. When the flatness exceeds a certain limit (in this case, when the flatness exceeds 4 or 5), the total length of the light-emitting portion is shortened, that is, the light-emitting area is reduced in the optical axis direction of the reflecting mirror. Since the length in the long axis direction becomes longer than the positive effect on the light intensity, that is, the light emitting region is expanded in the direction intersecting the optical axis direction, the adverse effect on the light collecting property is increased. This is because it is considered.

However, even in the case of 8 which is the maximum flatness rate in the test, there is no problem because the light collecting property is improved as compared with the case where the flatness rate of the conventional cylindrical coil is 1.
As described above, with respect to the light collecting property, when the short axis length is at least 0.5 [mm] and the flatness is greater than 1 and equal to or less than 8, the coil interval (light emitting portion interval) is the region where the line C5 is equal to or less. If it is in (including line C5), the reference illuminance or higher can be obtained.

Concerning the light condensing property, the minor axis length = 0, 0.4, 0.3, 0.2, 0.1 (line C4, line C3, line C2, line C1) is also described above. The same can be said for .5 (line C5).
Considering the relationship between the line C1 to the line C5, as the minor axis length becomes shorter from the minor axis length = 0.5 (line C5) to the minor axis length = 0.1 (line C1). The coil interval (light emitting unit interval) is shortened because, if the flatness is the same, the shorter the short axis length, the shorter the wire length per turn of the coil. (Total length) becomes longer. That is, since the light emitting area LA (FIG. 3) in the optical axis direction of the reflecting mirror becomes long, it is necessary to reduce the coil interval (light emitting unit interval) in order to ensure the necessary light collecting property.

The narrower the coil spacing (light emitting section spacing), the more concentrated the light emitting area LA (FIG. 3) is on the optical axis (focal point) of the reflecting mirror. However, if the coil interval (light emitting portion interval) is too narrow, there arises a problem that the impact resistance is lowered.
Hereinafter, the impact resistance will be described separately when 1 ≦ flat rate ≦ 5 and when 5 <flat rate ≦ 8. This is because, in both cases, the mechanism of disconnection that occurs upon impact is different.
(I) First, the impact resistance at 1 ≦ flatness ≦ 5 will be described.

  When each filament coil 62, 64, 66 receives an impact, the unsupported light emitting portions 62A, 64A, 66A (FIG. 4) bend like a bow and vibrate. At that time, between each light emitting portion 62A, 64A, 66A The direction of vibration varies. At this time, when the adjacent light emitting parts vibrate and come in contact with each other, they are electrically short-circuited, an overcurrent flows, and the coil wire is cut.

  Regarding the test results shown in FIG. 7, a test bulb having a minor axis length of 0.5 [mm] will be described as an example. In the region below the line S5, the coil interval (light emitting unit interval) is too narrow, Contact between adjacent filament coils is likely to occur and fails the impact resistance test, and those that fall in the area above the line S5 (including on the line S5) have sufficient coil spacing (light emitting section spacing) and pass the impact resistance test. It shows that it becomes.

As described above, with respect to impact resistance, when the short axis length is at least 0.5 [mm] and the flatness is greater than 1 and less than or equal to 5, the coil interval (light emitting portion interval) is the region where the line is greater than or equal to line S5. If it is in (including the line S5), the required impact resistance can be obtained.
Regarding the impact resistance, the minor axis length is 0.4, 0.3, 0.2, and 0.1 (line S4, line S3, line S2, and line S1), and the minor axis length is 0 as described above. The same can be said for the case of .5 (line S5).

Considering the relationship between the lines S1 to S5, as the minor axis length decreases from minor axis length = 0.5 (line S5) to minor axis length = 0.1 (line S1). The coil interval (light emitting portion interval) is longer because, if the flatness is the same, the shorter the short axis length, the shorter the wire length per turn of the coil. This is because the coil interval (light emitting unit interval) needs to be increased by the length of the total length) and the increase in vibration amplitude.
(Ii) Next, the impact resistance at 5 <flatness ≦ 8 will be described.

  When the flattening ratio increases, the filament coils 62, 64, and 66 have larger vibrations in the longitudinal direction (dominate) than vibrations that bend like a bow. In this case, contact between adjacent filament coils is reduced, but contact between adjacent turns in one filament coil occurs. The filament coil being lit is at a high temperature, and when adjacent turns come into contact with each other, the contact portions are fixed to each other, and some local short-circuit portions are generated. This short circuit does not cause an overcurrent so as to cause disconnection immediately, but the current increases as the short circuit occurs. As the current increases, the temperature of the filament coil rises excessively. When the filament coil is overheated, arc discharge occurs between adjacent filament coils, which causes disconnection.

In this case, if the minor axis length is the same, the greater the flattening ratio, and if the minority ratio is the same, the greater the minor axis length, the greater the degree of vibration in the longitudinal direction than the vibration that bends like a bow. The disconnection due to the arc discharge is likely to occur.
The test results shown in FIG. 7 will be described by taking a test light bulb with a short axis length of 0.5 [mm] as an example. Those that enter the region below the line S5 are adjacent to each other because the coil interval (light emitting unit interval) is too narrow. Arc discharge is likely to occur between coils, and the shock resistance test fails, and those that fall in the area above the line S5 (including on the line S5) have sufficient coil spacing (light emitting section spacing) and pass the shock resistance test. It shows that it becomes.

As described above, in terms of impact resistance, when the minor axis length is 0.5 [mm] and the flatness is greater than 5 and less than or equal to 8, the coil interval (light emitting portion interval) is a region where the line is greater than or equal to line S5 ( If it is in the line S5), the required impact resistance can be obtained.
Regarding the impact resistance, the minor axis length is 0.4, 0.3, 0.2, and 0.1 (line S4, line S3, line S2, and line S1), and the minor axis length is 0 as described above. The same can be said for the case of .5 (line S5).

  Considering the relationship between the lines S1 to S5, as the minor axis length increases from minor axis length = 0.1 (line S1) to minor axis length = 0.5 (line S5), As described above, the coil interval (light emitting unit interval) is large, as long as the flatness is the same, the longer the short axis length, the greater the vibration in the coil longitudinal direction, and the short circuit within the coil It becomes easy to get up. As a result, it is necessary to increase the coil interval (light emitting portion interval) as much as arc discharge between adjacent filament coils is likely to occur.

As described above, the mechanism of disconnection that occurs in the filament coil when an impact force is applied is different at a flatness ratio of 5. It is due to the difference in the mechanism that the magnitude relationship of the coil spacing (light emitting portion spacing) of the lines S1 to S5 is reversed with the flatness ratio = 5 as a boundary.
Therefore, a preferred relationship (combination) between the minor axis length and the flatness ratio and the coil interval (light emitting portion interval) will be described by dividing into a case where the flatness is 5 or less and a case where the flatness exceeds 5.
(I) 1 <Flat rate ≦ 5
(1) Minor axis length ≧ 0.5 [mm]
If at least the minor axis length is 0.5 [mm], in FIG. 7, the coil interval (light emitting portion interval) is a value (y coordinate value) within the region sandwiched in the vertical direction between the line C5 and the line S5. By setting to, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance.

  Specifically, in FIG. 7, the coil interval (light emitting portion interval) is represented by a point (1, 1.0), a point (2, 2.3), a point (3, 3) represented by (x, y) coordinates. 2.6), point (4, 2.7), point (5, 2.7), point (5, 0.3), point (4, 0.2), point (3, 0.2), A point (2, 0.3), a point (1, 0.4), and a point (1, 1.0) are sequentially connected by a line segment (including the line segment, provided that x = It may be set to the y-coordinate value of 1).

(2) Minor axis length ≧ 0.4 [mm]
If at least the minor axis length is 0.4 [mm], the coil interval (light emitting unit interval) in FIG. 7 is a value (y coordinate value) within a region sandwiched between the line C4 and the line S4 in the vertical direction. By setting to, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance.
Specifically, in FIG. 7, the coil interval (light emitting unit interval) is represented by a point (1, 0.7), a point (2, 1.9), a point (3, 3) represented by (x, y) coordinates. 2.2), point (4, 2.3), point (5, 2.4), point (5, 0.3), point (4, 0.23), point (3, 0.25), A point (2,0.4), a point (1,0.6), and a point (1,0.7) are sequentially connected by a line segment (including the line segment, where x = It may be set to the y-coordinate value of 1).

(3) Short axis length ≧ 0.3 [mm]
If at least the minor axis length is 0.3 [mm], in FIG. 7, the coil interval (light emitting portion interval) is a value (y coordinate value) within a region sandwiched in the vertical direction between the line C3 and the line S3. By setting to, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance. The line C3 and the line S3 intersect between x = 1 and x = 2, and the (x, y) coordinates of the intersection P3 are (1.33, 0.83).

  Accordingly, the coil interval (light emitting unit interval) is specifically shown in FIG. 7 as a point (1.33, 0.83), a point (2, 1.5) represented by (x, y) coordinates, Point (3, 1.9), point (4, 2.0), point (5, 2.1), point (5, 0.3), point (4, 0.25), point (3, 0 .3), the point (2, 0.5), and the point (1.33, 0.83) are sequentially set to the y-coordinate value in the area surrounded by the line segment (including the line segment). do it.

(4) Short axis length ≧ 0.2 [mm]
If at least the minor axis length is 0.2 [mm], the coil interval (light emitting unit interval) in FIG. 7 is a value (y coordinate value) within a region sandwiched between the line C2 and the line S2 in the vertical direction. By setting to, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance. The line C2 and the line S2 intersect between x = 1 and x = 2, and the (x, y) coordinates of the intersection P2 are (1.65, 0.88).

  Accordingly, the coil interval (light emitting unit interval) is specifically shown in FIG. 7 as a point (1.65, 0.88), a point (2, 1.2) represented by coordinates (x, y), Point (3, 1.6), point (4, 1.8), point (5, 1.9), point (5, 0.3), point (4, 0.28), point (3, 0 .35), the point (2,0.6), and the point (1.65,0.88) are sequentially set to the y-coordinate value in the area surrounded by the line segment (including the line segment). do it.

(5) Short axis length ≧ 0.1 [mm]
If at least the minor axis length is 0.1 [mm], in FIG. 7, the coil interval (light emitting portion interval) is a value (y coordinate value) within a region sandwiched between the line C1 and the line S1 in the vertical direction. By setting to, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance. The line C1 and the line S1 intersect between x = 1 to x = 2, and the (x, y) coordinates of the intersection P1 are (1.89, 0.82).

Therefore, the coil interval (light emitting portion interval) is specifically shown in FIG. 7 by points (1.89, 0.82), points (2, 1.2) represented by (x, y) coordinates, Point (3, 1.6), point (4, 1.8), point (5, 1.9), point (5, 0.3), point (4, 0.28), point (3, 0 .35), the point (2,0.6), and the point (1.89, 0.82) are sequentially connected to the y-coordinate value in the area surrounded by the line segment (including the line segment). do it.
(II) 5 <Flat rate ≦ 8
(1) Short axis length = 0.5 [mm]
When the minor axis length is 0.5 [mm], the coil interval (light emitting portion interval) in FIG. 7 is set to a value (y coordinate value) within a region sandwiched between the line C5 and the line S5 in the vertical direction. By doing so, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance.

  Specifically, in FIG. 7, the coil interval (light emitting unit interval) is represented by points (5, 2.7), (6, 2.6), (7, 7) represented by (x, y) coordinates. 2.5), point (8, 2.3), point (8, 0.9), point (7, 0.6), point (6, 0.4), point (5, 0.3), The point (5, 2.7) may be set to the y-coordinate value in the area surrounded by the line segment (including the line segment above, except for x = 5).

(2) Minor axis length = 0.4 [mm]
When the short axis length is 0.4 [mm], in FIG. 7, the coil interval (light emitting unit interval) is set to a value (y coordinate value) within the region sandwiched in the vertical direction between the line C4 and the line S4. By doing so, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance.
Specifically, in FIG. 7, the coil interval (light emitting portion interval) is represented by points (5, 2.4), (6, 2.4), (7, 7) represented by (x, y) coordinates. 2.3), point (8, 2.2), point (8, 0.8), point (7, 0.55), point (6, 0.39), point (5, 0.3), The point (5, 2.4) may be set to the y-coordinate value in the area surrounded by the line segment (including the line segment above, except for x = 5).

(3) Minor axis length = 0.3 [mm]
When the minor axis length is 0.3 [mm], the coil interval (light emitting portion interval) in FIG. 7 is set to a value (y coordinate value) within a region sandwiched between the line C3 and the line S3 in the vertical direction. By doing so, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance.
Specifically, in FIG. 7, the coil interval (light emitting portion interval) is represented by points (5, 2.1), (6, 2.2), (7, 7) represented by (x, y) coordinates. 2.2), point (8, 2.1), point (8, 0.7), point (7, 0.5), point (6, 0.38), point (5, 0.3), The point (5, 2.1) may be set to the y-coordinate value in the region surrounded by the line segment (including the line segment above, except for x = 5).

(4) Short axis length = 0.2 [mm]
When the minor axis length is 0.2 [mm], the coil interval (light emitting portion interval) in FIG. 7 is set to a value (y coordinate value) within a region sandwiched in the vertical direction between the line C2 and the line S2. By doing so, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance.
Specifically, in FIG. 7, the coil interval (light emitting portion interval) is represented by points (5, 1.9), (6, 2.0), (7, 7) represented by (x, y) coordinates. 2.0), point (8, 2.0), point (8, 0.6), point (7, 0.45), point (6, 0.37), point (5, 0.3), The point (5, 1.9) may be set to the y-coordinate value in the area surrounded by the line segment (including the line segment above, but excluding x = 5).

(5) Short axis length = 0.1 [mm]
When the minor axis length is 0.1 [mm], the coil interval (light emitting unit interval) in FIG. 7 is set to a value (y coordinate value) within a region sandwiched between the line C1 and the line S1 in the vertical direction. By doing so, it is possible to obtain a halogen light bulb having a necessary light collecting property and a necessary impact resistance.
Specifically, in FIG. 7, the coil interval (light emitting portion interval) is represented by points (5, 1.6), (6, 1.7), (7, 7) represented by (x, y) coordinates. 1.8), point (8, 1.8), point (8, 0.5), point (7, 0.4), point (6, 0.35), point (5, 0.3), The point (5, 1.6) may be set to the y-coordinate value in the area surrounded by the line segment (including the line segment above, but excluding x = 5).
(Embodiment 2)
FIG. 9 is a longitudinal sectional view showing a schematic configuration of the halogen bulb 100 with a reflector according to the second embodiment.

The halogen bulb 100 with a reflector is a reflector-integrated halogen bulb, but the halogen bulb 102 used therein is different from the halogen bulb 14 (FIG. 2) according to Embodiment 1 except that the base is mainly different. Since the configuration is basically the same, common portions are denoted by the same reference numerals, and description thereof is omitted.
The reflecting mirror 104 is made of hard glass or quartz glass and has a funnel-shaped base 106. On the concave surface portion 106A formed on the spheroidal surface or the paraboloid of the base 106, a multilayer interference film 108 constituting a reflective surface is formed. The multilayer interference film 108 can be formed of silicon dioxide (SiO ₂ ), titanium dioxide (TiO ₂ ), magnesium fluoride (MgF), zinc sulfide (ZnS), or the like, in addition to a metal film such as aluminum or chromium. The opening diameter (mirror diameter) of the reflecting mirror 104 is 100 mm. In addition, you may form a facet in a reflective surface as needed.

  The reflecting mirror 104 has a front glass 110 provided at the opening of the base 106. The front glass 110 is locked to the base 106 by a known stopper 112. In addition, it may replace with the fastener 112 and may adhere with an adhesive. Or you may use both together. However, the front glass is not an essential component of the halogen light bulb with a reflector, and may be omitted.

The neck portion 106 </ b> B of the base body 106 is fitted with a base body receiving portion 122 provided on the side opposite to the terminal portions 116 and 118 of the base 114 of the halogen light bulb 102, and is fixed by an adhesive 124.
Prior to the attachment of the base 106 to the base 114, the valve 26 is attached to the base 114.

As mentioned above, although this invention has been demonstrated based on embodiment, this invention is not restricted to an above-described form, Of course, it can also be set as the following forms, for example.
(1) In the first embodiment, the lighting device is configured by the lighting fixture including the reflecting mirror and the halogen light bulb. However, the lighting device is not limited thereto, and the lighting device does not include the reflecting mirror and the halogen light bulb with the reflecting mirror. It does not matter even if it constitutes. Specifically, for example, instead of the reflecting mirror 18 and the halogen bulb 14 in the lighting device shown in FIG. 1, the halogen bulb 100 with a reflecting mirror shown in FIG. 9 may be attached to constitute the lighting device.
(2) In the above embodiment, a halogen bulb is shown as an example of a bulb, but the present invention is also applicable to a bulb other than a halogen bulb. In short, any light source that emits incandescent light by passing an electric current through the filament body may be used.

  The tube according to the present invention is used, for example, by being incorporated in a reflecting mirror, and can be suitably used as a tube that requires light collection and impact resistance.

1 is a partially cutaway view illustrating a schematic configuration of a lighting device according to Embodiment 1. FIG. It is a figure which shows the halogen light bulb which comprises the said illuminating device. It is a perspective view which shows the support structure of the filament body in the said halogen bulb. It is a perspective view which shows the state by which the filament body was supported by the said support structure. It is a figure for demonstrating the manufacturing method of the filament coil which comprises the said filament body. It is the schematic diagram which looked at the filament body which consists of three filament coils from the coil axial direction. It is a figure which shows the test result which investigated the relationship between short axis length and flatness, and a coil space | interval. It is a list figure which shows the y coordinate value of each plot point in FIG. It is a figure which shows schematic structure of the halogen light bulb with a reflecting mirror which concerns on Embodiment 2. FIG. It is the figure which illustrated the shape of the cross section of a flat cylinder (shape).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Illuminating device 12 Lighting fixture 14,102 Halogen light bulb 18,104 Reflector 16 Valve 60 Filament body 62, 64, 66 Filament coil 62A, 64A, 66A Light emission part 100 Halogen light bulb with a reflector

Claims (13)

A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the minor axis length is at least 0.5 mm and the flatness is greater than 1 and less than or equal to 5, the spacing between the light emitting parts is
Point (1, 1.0), point (2, 2.3), point (3, 2.6), point (4, 2.7), point (5, 2.7), point (5, 0.3), point (4, 0.2), point (3, 0.2), point (2, 0.3), point (1, 0.4), The point (1, 1.0) is set to the y-coordinate value within the area surrounded by the line segment (including the line segment above, except for x = 1). A tube. A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the minor axis length is at least 0.4 mm and the flatness is greater than 1 and less than or equal to 5, the spacing between the light emitting parts is
The point (1, 0.7), the point (2, 1.9), the point (3, 2.2), the point (4, 2.3), the point (5, 5) represented by the (x, y) coordinates 2.4), point (5, 0.3), point (4, 0.23), point (3, 0.25), point (2, 0.4), point (1, 0.6), The point (1, 0.7) is set to the y-coordinate value in the area surrounded by the line segment (including the line segment above, except for x = 1). Tube. A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the short axis length is at least 0.3 mm and the flatness is greater than 1 and less than or equal to 5, the spacing between the light emitting parts is
A point (1.33, 0.83), a point (2,1.5), a point (3, 1.9), a point (4, 2.0), a point ( 5, 2.1), point (5, 0.3), point (4, 0.25), point (3, 0.3), point (2, 0.5), point (1.33, 0 .83) is set to the y-coordinate value in an area surrounded by the line segment (including the line segment). A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the minor axis length is at least 0.2 mm and the flatness is greater than 1 and less than or equal to 5, the spacing between the light emitting parts is
The point (1.65, 0.88), the point (2, 1.2), the point (3, 1.6), the point (4, 1.8), the point ( 5, 1.9), point (5, 0.3), point (4, 0.28), point (3, 0.35), point (2, 0.6), point (1.65, 0) .88) is set to the y-coordinate value in an area surrounded by the line segment (including the line segment). A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the minor axis length is at least 0.1 mm and the flatness is greater than 1 and less than or equal to 5, the spacing between the light emitting parts is
A point (1.89, 0.82), a point (2, 1.2), a point (3, 1.6), a point (4, 1.8), a point ( 5, 1.9), point (5, 0.3), point (4, 0.28), point (3, 0.35), point (2, 0.6), point (1.89, 0) .82) is set to a y-coordinate value in a region surrounded by a line segment (including the above-mentioned line segment). A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the short axis length is 0.5 mm and the flatness is more than 5 and 8 or less, the interval between the light emitting parts is
Point (5, 2.7), point (6, 2.6), point (7, 2.5), point (8, 2.3), point (8, 0.9), point (7, 0.6), point (6, 0.4), point (5, 0.3), and point (5, 2.7) are sequentially connected by line segments. A tube characterized in that it is set to a y-coordinate value within a region (including on the line segment, but excluding x = 5). A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the short axis length is 0.4 mm and the flatness is more than 5 and 8 or less, the interval between the light emitting parts is
Point (5, 2.4), point (6, 2.4), point (7, 2.3), point (8, 2.2), point (8, 0.8), point (7, 0.55), point (6, 0.39), point (5, 0.3), and point (5, 2.4) are sequentially connected by line segments. A tube characterized in that it is set to a y-coordinate value within a region (including on the line segment, but excluding x = 5). A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the minor axis length is 0.3 mm and the flatness is greater than 5 and less than or equal to 8, the distance between the light emitting parts is
Point (5, 2.1), point (6, 2.2), point (7, 2.2), point (8, 2.1), point (8, 0.7), point (7, 0.5), point (6, 0.38), point (5, 0.3), and point (5, 2.1) are sequentially connected by line segments. A tube characterized in that it is set to a y-coordinate value within a region (including on the line segment, but excluding x = 5). A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the short axis length is 0.2 mm and the flatness is more than 5 and 8 or less, the interval between the light emitting parts is
Point (5, 1.9), point (6, 2.0), point (7, 2.0), point (8, 2.0), point (8, 0.6), point (7, 0.45), point (6, 0.37), point (5, 0.3), and point (5, 1.9) are connected by a line segment in order. A tube characterized in that it is set to a y-coordinate value within a region (including on the line segment, but excluding x = 5). A tube that is used by being incorporated in a reflecting mirror having a concave reflecting surface, and whose rated voltage is set to 100 [V] or more and 150 [V] or less and the rated power is set to 100 [W] or less. ,
A hermetically sealed valve and a filament body provided in the valve;
In the filament body, three light emitting portions having a single coil shape wound in a cylindrical shape having a flat cross section having a major axis and a minor axis are equal to a direction perpendicular to the optical axis of the reflecting mirror. Each coil axis is arranged in a symmetrical manner with respect to the optical axis in a posture in which each coil axis is substantially parallel to the optical axis and the major axes are substantially parallel to each other.
In the xy orthogonal coordinate system, the flatness [dimensionalless] obtained by dividing the major axis length of the inner circumference of the light emitting part by the minor axis length is taken on the x axis, and the interval [mm] between the light emitting parts is When taken on the y-axis,
When the short axis length is 0.1 mm and the flatness is more than 5 and 8 or less, the interval between the light emitting parts is
A point (5, 1.6), a point (6, 1.7), a point (7, 1.8), a point (8, 1.8), a point (8, 1.8) represented by (x, y) coordinates 0.5), point (7, 0.4), point (6, 0.35), point (5, 0.3), and point (5, 1.6) are connected by line segments in order. A tube characterized in that it is set to a y-coordinate value within a region (including on the line segment, but excluding x = 5). A reflector,
The tube according to any one of claims 1 to 10, which is incorporated in the reflecting mirror;
A tube with a reflector, characterized by comprising: A lighting fixture having a reflector;
The tube according to any one of claims 1 to 10, which is incorporated in the reflecting mirror;
A lighting device comprising: Lighting equipment,
The tube with a reflector according to claim 11 attached to the lighting fixture;
A lighting device comprising:

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