JP2008041483A - Small incandescent lamp and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small incandescent lamp improved in brightness by efficient light distribution of irradiation of light of a lamp and a lighting device using the same. <P>SOLUTION: A reflecting film 16 is formed at a pinch seal portion 7 in which the lower end of a glass bulb 5 is pinch-sealed, in the lower end part of the glass bulb 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a small incandescent lamp and a lighting device that is a signal lamp of an automobile using the small incandescent lamp.

  Illumination devices as various signal lamps are provided on front and rear portions and side surfaces of a vehicle such as an automobile. The lighting device is, for example, a turn signal lamp used when starting a vehicle, changing a course, turning left or right, and a brake lamp is disposed at the rear of the automobile.

  In the turn signal lamp device, a small incandescent light bulb having a colorless and transparent glass bulb is arranged in a lamp constituting a lighting device composed of a reflecting mirror and an orange translucent lens cover. It emits a signal. And this kind of apparatus can inform the driver of a following vehicle or an oncoming vehicle of the course etc. of the own vehicle by lighting a turn signal lamp. In addition, this turn signal lamp device can clearly show the orange blinking signal of the cover color to the driver of the following vehicle or the oncoming vehicle at night or in dark conditions such as dusk or tunnel, so that attention should be paid to it. Can be aroused.

  In addition, the stop tail lamp is directed toward the rear of the car body through the cover by the light emitted from the small incandescent light bulb being reflected directly or after being reflected by the reflecting surface of the inner surface of the housing. A light beam is irradiated. At that time, the light reflected by the individual minute reflecting surfaces of the reflecting surface is diffused on the basis of the convex shape, and is irradiated to a relatively wide angle range with respect to the rear. Thereby, the visibility from the back wide angle range can be secured.

  In addition, regarding these signal lamps for automobiles, various light distribution standards have been established because visibility is directly related to human life and safety. For this reason, automakers usually provide at least specifications for the US, Europe, and Japan to support various light distribution standards.

  In the illumination devices used as these signal lamps, a small incandescent bulb called a wedge base lamp is usually used as a light source. As for the wedge base lamp, as shown in a front view in FIG. 8A and a side view in FIG. 8B, the compact incandescent bulb 40 seals the mount 42 at the lower end of the glass bulb 41. Thus, a substantially plate-like pinch seal portion 43 is formed. The pinch seal portion 43 leads a pair of lead wires 44 extending from the mount 42 to the outside of the small incandescent bulb 4 in an airtight manner. In addition, the dimension of the long side of the substantially plate-like pinch seal portion 43 is set smaller than the diameter of the glass bulb 41.

  FIG. 9 is an arrangement explanatory view showing the arrangement relationship in the mounted state of the lighting device. In the mounting structure of the lighting device 50 using a small incandescent bulb (wedge base lamp) 40 as a light source, the small incandescent bulb 40 is fixed to a socket 52 disposed below the reflector 51. In order to fix or detach the small incandescent bulb 40 from the socket 52 in the reflector 51, an attachment hole 53 through which the small incandescent bulb 40 passes is provided. The attachment hole 53 is set to have a slightly larger inner diameter than the outer diameter of the small incandescent bulb 40. Therefore, a gap 54 with a predetermined interval is formed between the outer diameter of the small incandescent bulb 40 and the inner diameter of the mounting hole 53.

  Note that an incandescent bulb such as the wedge base lamp 40 is a light source having a wide light distribution as shown in the region D, unlike the LED, and therefore, on the lower side (socket side) irradiated from the wedge base lamp. The light that spreads out passes through the attachment hole 53 or irradiates the socket 52 as in the region E indicated by the oblique lines. However, the mounting hole 53 and the socket 52 have almost no function of reflecting light emitted from the wedge base lamp 40. Therefore, the light that spreads below the wedge base lamp 40 cannot be used as illumination in front of the wedge base lamp 40, and is wasted light.

A technique in which a visible light transmitting infrared reflecting film is formed on a sealing-side curved portion of a tubular bulb of a halogen bulb is disclosed. (For example, see Patent Document 1)
Moreover, the structure of the vehicle headlamp provided with the reflector is also disclosed. (For example, see Patent Document 2)
Japanese Utility Model Publication No. 5-72042 JP-A-8-96774

  As described above, with regard to a signal lamp for an automobile, the visibility is directly related to the life and safety of a driver or the like. Therefore, in order to improve visibility, it is desired to improve the brightness by efficient light distribution of the irradiation light of the lamp. In addition, there are strong demands from automobile manufacturers for power saving for reducing fuel consumption of automobiles and for extending the service life to realize maintenance-free.

  In addition, in the technique described in Patent Document 1 described above, a visible light transmitting infrared reflecting film is formed on a sealing-side curved portion or the like of a tube bulb of a halogen bulb. The visible light is transmitted and emitted to the outside of the tubular bulb, and has no reflection function. Therefore, efficient use of light is not possible.

  Further, in the technique described in Patent Document 1 described above, the light emitted from the lamp is reflected by the reflector, but the reflection at the base portion (socket) holding the bulb is not mentioned. Therefore, the efficient use of the light irradiated to the base part holding the light bulb is not clearly shown.

  The present invention has been made based on these circumstances, and an object of the present invention is to provide a small incandescent bulb having improved brightness by efficient light distribution of lamp irradiation light and an illumination device using the same.

A first feature of the embodiment of the small incandescent bulb according to the present invention is that a light emission source is formed inside a sealed glass bulb, and the lower end of the glass bulb is pinched with a lower end of the glass bulb. And a small incandescent bulb formed with a pinch seal portion for leading the lead wire connected to the light emitting source to the outside of the glass bulb,
A reflection film is formed on the pinch seal portion.

  Moreover, the 2nd characteristic which concerns on embodiment of the small incandescent lamp of this invention is that the said reflecting film formed in the said pinch seal part is colored.

In addition, the first feature according to the embodiment of the lighting device of the present invention is a lighting device in which a small incandescent bulb is fixed to a socket through an attachment hole provided in the reflector,
A reflecting member is interposed between the small incandescent bulb and the socket.

  Moreover, the 2nd characteristic which concerns on embodiment of the illuminating device of this invention is that the said reflection member is a metal sheet or plastic sheet by which the mirror surface was formed in the surface by plating.

  Moreover, the 3rd characteristic which concerns on embodiment of the illuminating device of this invention is that the said reflection member is the dish shape curved to the said small incandescent lamp side.

  Moreover, the 4th characteristic which concerns on embodiment of the illuminating device of this invention is that the said reflection member is colored.

  ADVANTAGE OF THE INVENTION According to this invention, the light from the small incandescent lamp which is a light source can be efficiently distributed, and the small incandescent lamp which improved the brightness, and an illuminating device using the same can be provided.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the small incandescent lamp and the lighting device using the same according to the present invention will be described below with reference to the drawings.

  FIG. 1 is an external view showing a rear portion of a vehicle such as a passenger car in FIG. 1. That is, as shown in FIG. 1, the rear part of the passenger car 1 always emits a light signal of appropriate chromaticity with good visibility to the driver of the following vehicle or oncoming vehicle regardless of daytime or nighttime. A signal illumination device 2 is provided. The signal lighting device 2 is disposed at symmetrical positions on the left and right sides of the rear trunk 3. Types of the signal illumination device 2 are a brake lamp, a turn signal lamp, a stop lamp, and the like. In addition, as a light source of the lighting device 2 for these signals, a wedge base lamp which is a small incandescent bulb is usually used.

  Next, a small incandescent lamp (wedge base lamp), which is a light source that is a subject of the present invention, shown in FIG. 2 (a) and a side view in FIG. 2 (b) will be described.

  The small incandescent lamp 4 is formed with a substantially plate-like pinch seal portion 7 that seals a mount 6 provided inside the glass bulb 5 at the lower end of the glass bulb 5 in terms of shape. The pinch seal portion 7 leads a pair of lead wires 8 extending from the mount 6 to the outside of the small incandescent bulb 4 in an airtight manner. In addition, the dimension of the long side of the cross section of the direction in which the name of the glass bulb 5 of the substantially plate-like pinch seal portion 7 is orthogonal to the hand direction is set smaller than the diameter of the glass bulb 5.

  That is, the glass bulb 5 is formed of a soft glass such as lead glass or soda lime glass, and in terms of shape, the cylindrical straight portion 5a and the bulb throttle portion 5b are successively and continuously downward from the top 5t of the glass bulb 5. And the pinch seal part 7 is formed.

  The inside of the glass bulb 5 is filled with an inert gas containing a gas containing at least one kind of argon, krypton, xenon, nitrogen, or the like, or the glass bulb 5 is kept in a vacuum state with a vacuum atmosphere. ing. Inside the glass bulb 5, a coiled filament 9 made of tungsten is disposed as a light source. Both ends of the filament 9 are connected to lead wires 8 which are sealing wires. The other end of the lead wire 8 is led out of the glass bulb 5 through a pinch seal portion 7 in which the lower end of the glass bulb 5 is pinched. In addition, the lead wire 8 which is a sealing wire uses, for example, a three-layer composite wire in which a 42 Ni-Fe wire which is a core metal is coated with a 20 wt% to 25 wt% Cu layer and Ni is coated on this surface. Yes.

  Next, a lighting device using the small incandescent bulb 4 will be described.

FIG. 3 is a layout explanatory diagram for explaining the positional relationship among the small incandescent light bulb 4, the socket 12, and the reflector 13 when the small incandescent light bulb 4 is mounted on the socket 12 as the lighting device 11.

  That is, the socket 12 and the reflector 13 are each fixed and arranged at a predetermined position by a structural member such as an automobile (not shown). A lamp mounting hole 14 through which the small incandescent bulb 4 can be detachably mounted is provided at the coaxial position corresponding to the socket 12 of the reflector 13. The small incandescent bulb 4 is fixed to the socket 12 through the lamp mounting hole 14. Therefore, a predetermined gap 15 is formed between the outer diameter of the small incandescent bulb 4 and the lamp mounting hole 14 so as not to damage the outer shape of the small incandescent bulb 4 when being attached or detached.

  Hereinafter, each embodiment of the small incandescent light bulb 4 and the illumination device 11 of the present invention will be described. In addition, since the structure itself of the small incandescent lamp 4 and the attachment state to the socket 12 as the illuminating device 11 have been described above, they are omitted in the following embodiments. In addition, in each embodiment, the above-mentioned description is used for the name and code | symbol of each part.

(Embodiment 1)
FIG. 4A shows a front view and FIG. 4B shows a side view. In the first embodiment, the reflective film 16 is formed on the bulb aperture portion 5b of the glass bulb 5 of the small incandescent bulb 4a. The reflective film 16 is formed by means such as vacuum deposition, sputtering, spray coating, dipping, sol-gel, electrostatic coating, ion plating, CVD, etc. It is formed by using a material such as aluminum. When the reflective film 16 is formed, the pinch seal portion 7 and the valve straight portion 5a are masked so that the reflective film 16 is not formed at those locations.

  Moreover, by making the reflective film 16 into a colored coating, it is possible to change the emission color of the small incandescent bulb 4a whose reflected light has been discolored. As the pigment material for the colored film, for example, an oxide of chromium is used in the case of orange or yellow, and an oxide of selenium or iron is used in the case of red.

  That is, since the reflection film 16 is formed on the bulb aperture portion 5 b of the glass bulb 5, the light irradiated from the filament 9 and directed downward is reflected by the reflection film 16 and directed toward the front of the glass bulb 5. Light is distributed to irradiate. Thereby, the light irradiated from the filament 9 can be efficiently distributed forward, and the light distribution efficiency of the small incandescent bulb 4a can be increased.

(Embodiment 2)
FIG. 5A shows a partially cutaway front view, and FIG. 5B shows a plan view of the reflecting member. In the second embodiment, a reflecting member 17 that reflects light is interposed between the small incandescent bulb 4 and the socket 12 that holds the small incandescent bulb 4. The reflecting member 17 is formed with a rectangular through hole 18 that penetrates the pinch seal portion 7 in a close state in the center, and the small incandescent bulb 4 has the socket 12 with the pinch seal portion 7 passing through the through hole 18. It is fixed to.

  As the reflecting member 17, for example, a mirror-like metal sheet or a silver-plated plastic sheet is used.

  Also in the second embodiment, the reflecting member 17 is disposed on the pinch seal portion 7 below the valve throttle portion 5b of the glass bulb 5. Therefore, the light emitted from the filament 9 (not shown) and directed downward is distributed by the reflecting member 17 so as to be irradiated toward the front of the glass bulb 5. Further, since the outer periphery of the reflecting member 17 extends to a position covering the gap 15 formed between the small incandescent bulb 4 and the reflector 13, the light entering the gap 15 is also shielded and reflected by the reflecting surface. Light distribution.

  Thereby, the light irradiated from the filament 9 can be efficiently distributed in front of the filament 9, and the light distribution efficiency of the small incandescent bulb 4 can be improved.

  Moreover, by making the reflective member 17 into a colored coating, it becomes possible to change the color of the reflected light and change the emission color of the small incandescent bulb 4. As the pigment material for the colored film, for example, an oxide of chromium is used in the case of orange or yellow, and an oxide of selenium or iron is used in the case of red.

(Embodiment 3)
FIG. 6A shows a front view, FIG. 6B shows a side view, and FIG. 6C shows a plan view of the reflecting member 19. In the third embodiment, similarly to the second embodiment, a reflective member 19 that reflects light is interposed between the small incandescent bulb 4 and the socket 12 that holds the small incandescent bulb 4. However, the shape of the reflecting member 19 is different from that of the second embodiment.

  In the third embodiment, a dish-shaped reflecting member 19 that reflects light is inserted between the small incandescent bulb 4 and the socket 12 that holds the small incandescent bulb 4. The reflection member 19 is formed with a rectangular through hole 18 that penetrates the pinch seal portion 7 in a close state in the center, and a plurality of cuts 21 are formed in the rectangular through hole 18 toward the outside. Are formed radially. The small incandescent bulb 4 is fixed to the socket 12 with the pinch seal portion 7 passing through the through hole 18. When fixed, it is deformed into a dish shape by a plurality of radial cuts 21 and is brought into close contact with a portion corresponding to the valve throttle portion 5b.

  The plurality of radial notches 21 formed in the reflecting member 19 are for deforming the reflecting member 19 into a dish shape. Therefore, when the reflecting member 19 is molded into a dish shape, a plurality of radial notches 21 are formed. There is no need to provide the radial cuts 21 of the book.

  Also in the third embodiment, as the reflecting member 19, for example, a mirror-like metal sheet or a silver-plated plastic sheet is used.

  Also in the case of the third embodiment, the reflecting member 19 is arranged in close contact so that the portion corresponding to the bulb throttle portion 5b of the glass bulb 5 is along. Therefore, the light emitted from the filament 9 and directed downward is distributed by the reflection member 19 so as to be reflected toward the front of the glass bulb 5. Moreover, since the outer periphery of the reflecting member 19 extends to a position covering the gap 15 formed between the small incandescent bulb 4 and the reflector 13, the light distribution is performed so that the light entering the gap 15 is also blocked and reflected. Is done.

  Thereby, the light irradiated from the filament 9 can be efficiently distributed forward, and the light distribution efficiency of the small incandescent bulb 4 can be increased.

  Moreover, by making the reflective member 19 into a colored coating, it is possible to change the color of the reflected light and change the emission color of the small incandescent bulb 4. As the pigment material for the colored film, for example, an oxide of chromium is used in the case of orange or yellow, and an oxide of selenium or iron is used in the case of red.

  In addition, in the above-mentioned Embodiment 2 and Embodiment 3, although the small incandescent light bulb 4 to be used can use a conventional light bulb, of course, the small incandescent light bulb 4a described in Embodiment 1 can also be used.

  Next, comparison of light distribution characteristics between the above-described embodiments and the conventional case will be described.

  FIG. 7 is an explanatory diagram of a light distribution image showing a comparison between the above-described embodiments and the conventional case. In FIG. 7, the above-described embodiments and the conventional case are simultaneously displayed.

  That is, in the conventional case, the small incandescent bulb 4 or a reflecting means for reflecting the irradiation light from the small incandescent bulb 4 is not provided between the small incandescent bulb 4 and the socket 12. Accordingly, light from the small incandescent bulb 4 downward (in the direction of the socket 12) irradiates the region A indicated by the oblique lines from the gap 15 of the reflector 13.

  The light distribution image of the light irradiated in front of the small incandescent bulb 4 at that time is a region B indicated by plain color.

  On the other hand, in each of the above-described embodiments, the small incandescent bulb 4 or a reflecting means for reflecting the irradiation light from the small incandescent bulb 4 is provided between the small incandescent bulb 4 and the socket 12. Therefore, the light which irradiates the area | region A which is the light from the small incandescent lamp 4 below (direction of the socket 12) is reflected by a reflection means. Therefore, the area A indicated by hatching does not exist as an illumination light area and irradiates the front of the small incandescent bulb 4.

  As a result, the light distribution image of the light irradiated in front of the small incandescent bulb 4 is a region in which a region C indicated by hatching is added to a region B indicated by plain color.

  Therefore, in the case of each embodiment, it turns out that the light distribution efficiency ahead of the small incandescent bulb 4 has improved compared with the conventional case.

  Actually, as a result of measuring the total luminous flux in front of the small incandescent bulb 4 in the case of each embodiment and the conventional case, it was confirmed that the case of each embodiment was 4% brighter.

  From this confirmation result, the following can be said for each embodiment.

(A) If a small incandescent bulb having the same characteristics as the conventional one is used, the case of each embodiment becomes brighter.

(B) If the small incandescent light bulb has the same brightness as the conventional one, the power consumption can be reduced in each embodiment.

(C) If the small incandescent light bulb has the same power consumption as that of the prior art, the life of the small incandescent light bulb is extended in each embodiment.

(D) In each embodiment, it is possible to finely adjust the emission color by coloring the reflective surface of a small incandescent bulb or the like.

(E) In the case of each embodiment, if the small incandescent light bulb is a clear light bulb and uses a clear lens, it is difficult to see the small incandescent light bulb from the appearance of the light fixture. Thereby, the design as a lamp can be improved.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The external view which shows the rear part of the vehicle carrying the illuminating device of this invention. (A) is a front view of the small incandescent bulb which is the object of the present invention, and (b) is a side view thereof. The layout of the illuminating device of this invention. (A) is the front view of embodiment of this invention, (b) is the side view. (A) is a partially cutaway front view of an embodiment of the present invention, and (b) is a plan view of the reflecting member. (A) is a front view of embodiment of this invention, (b) is the side view, (c) is a top view of the reflection member. The light distribution image explanatory drawing which showed the comparison with each embodiment and the conventional case. (A) The front view of the conventional wedge base lamp, (b) is the side view. Arrangement explanatory drawing which shows the arrangement | positioning relationship in the attachment state of the conventional illuminating device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Passenger car, 2, 11 ... Illuminating device 4, 4a ... Small incandescent bulb, 5 ... Glass bulb, 6 ... Mount, 7 ... Pinch seal part, 8 ... Lead wire, 9 ... Filament, 12 ... Socket, 13 ... Reflector , 14 ... Lamp mounting hole, 15 ... Gap, 16 ... Reflecting film, 17, 19 ... Reflecting member, 18 ... Through-hole, 21 ... Notch

Claims (6)

A light emission source is formed inside the sealed glass bulb, and the lower end of the glass bulb is pinch-sealed at the lower end of the glass bulb, and a lead wire connected to the light emission source is led out of the glass bulb. A small incandescent bulb with a pinch seal part
A small incandescent bulb characterized in that a reflective film is formed on the pinch seal portion.   The small incandescent lamp according to claim 1, wherein the reflective film formed on the pinch seal portion is colored. A lighting device in which a small incandescent bulb is fixed to a socket through a mounting hole provided in a reflector,
A lighting device, wherein a reflective member is interposed between the small incandescent bulb and the socket.   The lighting device according to claim 3, wherein the reflecting member is a metal sheet or a plastic sheet having a mirror surface formed by plating.   The lighting device according to claim 3, wherein the reflecting member has a dish shape curved toward the small incandescent bulb.   The lighting device according to claim 3, wherein the reflecting member is colored.

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