JPH10199489A - Electric bulb with reflecting mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance luminous efficiency, reduce an infrared component illuminated to the front a reflecting mirror, reduce infrared emitted to the rear of the reflecting mirror, and enhance luminaire efficiency by constituting with a curved surface reflecting mirror on which a visible light reflecting infrared transmitting film is formed and a globular or spheroid light transmitting airtight container on which an infrared reflecting visible light transmitting film is formed. SOLUTION: A tungsten halogen lamp 1 has a bulb 2 which has a globular body part or a spheroid body part and is a light transmitting airtight container which is made of transparent quartz. An infrared reflecting visible light transmitting film 9 made of an optical interference film formed by alternately stacking a high refractive index layer and a low refractive index layer, reflecting infrared and transmitting visible light is formed on the outer surface of the bulb 2. An infrared absorbing film 14 made of AlO2 or the like is formed on the reflecting surface forming a rotating parabolic surface of a reflecting mirror main body 11 of an aluminum reflecting mirror 10, and a dichroic film 15 formed by alternately stacking a high refractive index layer and a low refractive index layer, transmitting infrared, and reflecting visible light is stacked on the infrared absorbing film 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a light bulb having an infrared-reflective visible light transmitting film formed on the inner surface or outer surface of a light-transmitting airtight container, and comprises a reflecting mirror for reflecting light emitted from the light bulb. The present invention relates to a light bulb with a reflector.

[0002]

2. Description of the Related Art For example, a spot downlight used in a store or the like is a so-called reflective type comprising a lamp as a light source and a reflecting mirror which houses the lamp and reflects light emitted from the lamp. Light bulbs with mirrors are used. Such a spot downlight is preferably a light of a high color rendering property and a cool color in order to make the irradiated product stand out distinctly from other products, that is, in order to enhance the lighting effect. Incandescent light bulbs,
In particular, a halogen bulb is used. In addition, a reflecting mirror provided with a dichroic film on the reflecting surface is used so that the product emitted from the lamp does not thermally deteriorate due to heat emitted from the lamp.

[0003] The dichroic film is formed of a multilayer optical interference film and has a property of reflecting visible light and transmitting infrared light. Therefore, the infrared light of the light emitted from the lamp is transmitted and the visible light is reflected. Therefore, the ratio of irradiating heat rays from the reflecting mirror is reduced, and the thermal effect on the product can be reduced.

However, in the case of a conventional halogen lamp with a mirror using a dichroic film, the heat ray radiated forward is reduced by about 80%, but this infrared ray is radiated backward from the reflector body.

[0005] The heat released to the rear heats the appliance, and when a large number of such bulbs with reflectors are used in the same room, the amount of heat released from these bulbs is considerably large, and even if the products are not thermally degraded. This puts a considerable burden on air conditioning equipment.

In order not to put a burden on the air conditioning equipment, it is necessary to reduce the amount of heat emitted from the bulb with a reflector, that is, it is desired to improve the lamp efficiency. In order to improve the lamp efficiency, it has recently been proposed to form an infrared-reflective visible light transmitting film on the inner surface or the outer surface of the bulb. The infrared reflecting visible light transmitting film of such a lamp is also formed of a multilayer light interference film, which transmits visible light emitted from the filament housed in the bulb, but reflects infrared light. The returned infrared rays are returned to the filament. The reflected infrared rays reheat the filament, and thus the power supplied from the outside for incandescent emission of the filament can be reduced, and the luminous efficiency is improved.

[0007]

However, the halogen bulbs conventionally considered have a bulb shape that is elongated and cylindrical along the center line (= optical axis) of the reflector. Thus, in the case of a lamp having a cylindrical bulb shape,
Since the reflecting surface is cylindrical, if the infrared radiation emitted from the filament is reflected by the infrared reflective film formed on the inner or outer surface of the cylindrical bulb, it may be reflected in the direction away from the filament. The rate at which the infrared light reflected by the film returns to the original filament is small.
As described above, in order to capture infrared rays reflected in a direction away from the filament, the length of the filament must be increased, but a lamp having a large filament length is of a high voltage type.

For example, when a low voltage type lamp with an infrared reflecting visible light transmitting film is required, it is necessary to shorten the filament length. However, if the filament length is shortened and the bulb shape is made cylindrical, it becomes difficult to capture infrared light reflected in a direction away from the filament, so that the efficiency of absorbing the infrared light by the filament is not good.

[0009] It is an object of the present invention to improve the luminous efficiency of the lamp, to reduce the infrared component in the light emitted from the reflector forward, and to reduce the infrared emitted to the rear of the reflector. It is an object of the present invention to provide a reflector-equipped light bulb with improved appliance efficiency.

[0010]

According to a first aspect of the present invention, there is provided a reflector-equipped light bulb having a curved surface having an opening at a front portion, a neck portion at a rear portion, and a visible light-reflecting infrared transmitting film formed at an intermediate portion; A light-transmitting airtight container having a substantially spherical body or a substantially spheroidal body provided with an infrared-reflective visible light-transmitting film, which is disposed optically opposite to the mirror, and disposed in the airtight container. The filament, one end of which is connected to the filament and the other end of which is electrically connected to the internal lead wire provided in the sealing portion of the light-tight hermetic container, and inside the sealing portion of the light-tight hermetic container And an incandescent light bulb having an external lead wire led out of the sealing portion.

According to the second aspect of the present invention, there is provided a light bulb with a reflector.
The described incandescent lamp is characterized by operating at a voltage of 6 to 36V. According to a third aspect of the present invention, the focal point of the reflector according to the first aspect is Fr, the outer diameter of the substantially spherical body portion or the substantially spheroidal portion is D, and the center of the translucent airtight container is O.
Where D / a ≦ 0.25 and O-Fr distance ≦ 2 mm are satisfied.

According to the first to third aspects of the present invention, the incandescent lamp having the improved infrared absorption efficiency of the filament and the improved luminous efficiency is attached to the reflector as described above, so that the infrared light emitted from the incandescent lamp is emitted. And the amount of heat that reaches the reflecting surface of the reflecting mirror is reduced, and the infrared component of the light emitted from the reflecting mirror forward is reduced, and the amount of infrared light emitted behind the reflecting mirror is also reduced. Is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to one embodiment shown in FIGS. The figure shows a halogen lamp with a dichroic mirror, 1 indicates a halogen lamp as an incandescent lamp, and 10 indicates a reflector. The halogen bulb 1 has a bulb 2 as a light-transmitting airtight container having a substantially spherical body or a substantially spheroidal body and made of, for example, transparent quartz glass having an outer diameter of about 8 to 15 mm. A crush seal portion 3 is formed at one end. The halogen bulb 1 operates at a low voltage, for example, about 6 to 36 V, and a pair of metal foil conductors 4 and 4 made of molybdenum or the like are sealed in the sealing portion 3. Are connected to internal introduction wires 5 and 5 as internal lead wires. These internal introduction lines 5, 5 are guided into the bulb 2, and a filament 6 made of a tungsten coil is provided between both ends thereof. Filament 6 is arranged to be located above the valve shaft O ₁ coil axis along the valve axis O _1.

External lead wires 7 are connected to the pair of metal foil conductors 4 and 4 sealed in the crush seal portion 3 as external lead wires.
The power supply terminal pins 8 are connected to the external introduction lines 7. Argon gas at a predetermined pressure and halogen such as a bromine compound are sealed in the bulb 2.

An infrared reflecting visible light transmitting film 9 is formed on the outer surface of the bulb 2. The infrared-reflective visible light transmitting film 9 is a light interference film, and although not shown, a high-refractive-index layer and a low-refractive-index layer are alternately layered, although not shown, and are configured as a multilayer film of, for example, a total of 9 to 17 layers. Thus, it has the property of reflecting infrared light but transmitting visible light.
The high refractive index layer is made of titanium oxide (TiO ₂ ), tantalum oxide (Ta ₂ O ₅ ), zirconium oxide (ZrO ₂ ), zinc sulfide (ZnS), and the like, and the low refractive index layer is silicon oxide (silica = SiO _2). ), Magnesium fluoride (Mg
F ₂ ).

The halogen lamp 1 having such a configuration is accommodated in the reflecting mirror 10. The reflecting mirror 10 includes a reflecting mirror main body 11 forming a paraboloid of revolution. This reflector body 1
1 may be made of glass, but in the case of this embodiment, is made of metal, for example, aluminum. The diameter of the mirror is 35 to 60 mm in the front opening of the reflecting mirror body 11.
And a lamp mounting cylindrical portion 13 is formed on the rear surface.

The lamp mounting tube 13 has a cylindrical or rectangular tube shape, and the crushable sealing portion 3 of the bulb 1 is inserted from the front side. A reflecting surface is formed on a paraboloid of revolution of the reflecting mirror body 11, and an infrared absorbing film 14 and a dichroic film 15 are laminated on the reflecting surface.

The infrared absorbing film 14 is made of Cr ₂ O ₃ SiO _x ,
It is formed of TiO _x , AlO _2, etc., and is formed on the inner surface of the reflector main body 11 made of aluminum. The dichroic film 15 is one type of a light interference film, and includes titanium oxide (TiO ₂ ) and tantalum oxide (Ta ₂ O) as described above.
₅ ), zirconium oxide (ZrO ₂ ), zinc sulfide (Zn
S) and a high refractive index layer such as silicon oxide (silica = SiO
₂ ) Low-refractive-index layers such as magnesium fluoride (MgF ₂ ) are formed by alternately stacking, for example, 21 layers, and have a property of transmitting infrared light and reflecting visible light.

The halogen bulb 1 is integrally attached to such a reflecting mirror 10. That is, the crushed sealing portion 3 of the halogen bulb 1 is bonded to the lamp mounting tube portion 13 of the reflecting mirror 10 with the adhesive 16. In this case pinch seal portion 3 of the bulb 1 is inserted into the lamp mounting cylinder portion 13 from the front side of the reflecting mirror 10, the central axis or optical axis O ₂ substantially coincides valve shaft O ₁ and the reflecting mirror 10 of the halogen lamp 1 Between the outer surface of the crushable sealing portion 3 and the inner surface of the lamp mounting tube portion 13 in a state where the filament 6 is adjusted to a predetermined position with respect to the focal position of the reflecting mirror 10. The adhesive 16 is filled, the adhesive 16 is dried and solidified, and the bulb 1 and the reflector 10 are joined.

The adhesive 16 is made of alumina, silica,
A heat-resistant inorganic adhesive mainly containing a metal oxide such as magnesia and zirconia is used. Reference numeral 17 denotes a closing plate, which closes a rear end opening of the lamp mounting tube portion 13,
It assists the positioning of the bulb 1 and prevents the adhesive from flowing out.

The operation of the bulb with a reflector having such a configuration will be described. When the halogen bulb 1 is turned on, the filament 6
This light passes through the bulb 2, is reflected by the reflection film 15 of the reflection mirror 10, and is radiated forward from the front opening 12. In this case, when the light emitted from the filament 6 passes through the bulb 2, it enters the infrared-reflective visible light transmitting film 9 formed on the outer surface of the bulb 2. Of the light that reaches the infrared-reflective visible light transmitting film 9, for example, 700 to 130
The light in the infrared region of 0 nm is reflected by the infrared reflective visible light transmitting film 9.
And visible light is mainly transmitted.

The reflected infrared light is returned to the filament 6, so that the filament 6 is heated again by the reflected infrared light, so that power consumption is reduced and luminous efficiency is improved.

In this case, the valve 2 has a spherical shape.
Since the infrared reflecting visible light transmitting film 9 formed on the inner surface or the outer surface is also arranged in a substantially spherical shape, the infrared light reflected by the infrared reflecting visible light transmitting film 9 is directed to the center of the bulb 2. For this reason, the infrared rays are surely returned to the filament 6 disposed at the center of the bulb 2, that is, the infrared rays return efficiency is high. Therefore, the lamp efficiency is improved.

From this, even if the filament 6 is shortened, the infrared light reflected by the infrared-reflective visible light transmitting film 9 is directed toward the center of the bulb 2 and reliably returns to the filament 6, and therefore operates at a low voltage. It can be applied to lamps that do.

The light that has passed through the infrared-reflective visible light transmitting film 9 and has reached the reflecting surface of the reflecting mirror 10 is a dichroic film 15 formed on the reflecting surface. Through the dichroic membrane 15,
The light is absorbed by the infrared absorbing film 14 and transmitted to the reflecting mirror body 11. Therefore, the temperature of the reflector main body 11 increases, but this heat is released from the back surface of the reflector main body 11. The visible light that has reached the dichroic film 15 is reflected by the dichroic film 15, is projected forward from the front light-emitting opening 12, and irradiates the surface to be irradiated.

For this reason, the infrared rays emitted from the filament 6 are cut off by the infrared reflecting visible light transmitting film 9 of the bulb 2 and the dichroic film 1 of the reflecting mirror 10 is cut off.
Since the light is transmitted to the back side at 5, the heat does not reach the irradiated surface,
Thermal degradation of the irradiated surface is prevented.

In the case of such an embodiment, the lamp efficiency of the halogen bulb 1 in which the bulb 2 is spherical and the infrared reflective visible light transmitting film 9 is formed on the inner surface or the outer surface of the bulb 2 is such that the infrared reflective visible light transmitting film 9 is formed. 20-3 compared to the case without
0% improvement.

Further, since the infrared rays are reused inside the lamp, the infrared rays reaching the reflecting mirror 10 are reduced, and the infrared rays irradiated on the front surface of the reflecting mirror 10 are reduced to 10% or less. Further, since the heat reaching the reflecting mirror main body 11 is also small, the temperature of the reflecting mirror main body 11 does not rise much. For this reason, the indoor temperature rise is reduced, and the load on the air conditioning equipment can be reduced.

The result of an experiment conducted on the present embodiment will be described. The halogen bulb 1 was composed of a spherical bulb 2 having an outer diameter D of 12 mm and having a rating of 12 V and 35 W. This lamp had a lamp efficiency of about 17.5 lm / W before the formation of the infrared-reflective visible light transmitting film 9, but the outer surface of the lamp was made of TiO.
_{When the} infrared-reflective visible light transmitting film 9 made of a _2- SiO ₂ multilayer film was formed, the lamp efficiency was about 23.1 lm / W, and an improvement of about 32% was recognized.

Further, a lamp having a rating of 12 V and 50 W was manufactured, and this lamp was mounted on a reflecting mirror 10 having a mirror diameter of 50 mm. The spectral spectrum distribution of the forward irradiation light reflected by the dichroic film 15 was measured. 2 were obtained. FIG. 2 shows the wavelength (nm) on the horizontal axis and the relative spectral power (%) on the vertical axis. In FIG. 2, the solid line is a lamp having the infrared-reflective visible light transmitting film 9 formed, and the broken line is the infrared-reflective visible light transmission. This is the case of a lamp without a film.

From this measurement result, it is apparent that the halogen bulb with a mirror according to the present embodiment hardly emits infrared rays forward, and it is confirmed that the halogen bulb is cut by 90% or more.

In this case, in order to obtain the same illuminance as the lamp without the infrared-reflective visible light transmitting film, the power consumption of the lamp having the infrared-reflective visible light transmitting film 9 of the present invention is about 37 W. It has been found that this can be achieved, which is a 26% improvement in lamp efficiency. With such power consumption, the temperature rise of the reflector 10 is reduced.

If the reflecting mirror 10 is made of metal, particularly aluminum, it has excellent heat conductivity and good heat dissipation, and is excellent in heat resistance, so that there is no fear of breakage as compared with glass. As a result, even if the reflector is made of aluminum and the diameter of the mirror is changed from 50 mm to 35 mm, it is suitable for practical use in terms of heat resistance, and can meet the demand for small size and high efficiency.

Next, the result of examining the return efficiency of the infrared light returned to the filament 6 for the spherical halogen lamp 1 will be described. First, a value representing how far the infrared rays return geometrically to the filament 6 will be referred to as a shape factor. The shape factor is defined as “shape factor = 1” when all the infrared rays reflected by the infrared-reflective visible light transmitting film 9 are returned to the filament, and “shape factor = 0 ".

As shown in FIG. 3, the outer diameter of the spherical bulb 2 is D, the length of the filament 6 provided with a filament center at the center of the bulb is n, and the coil diameter of the filament 6 is d. If the bulb 2 is spherical, the shape factor is 1 if the filament 6 is spherical. However, spherical filaments are difficult to produce, and considering the ease of production and filament efficiency, it is appropriate to use existing cylindrical filaments. In this case, n / d
It is easy to think that the shape becomes closer to a sphere if it is set to = 1, and it becomes more effective. However, it becomes difficult to pick up light emitted from the end of the filament, and a higher shape factor can be obtained by increasing n to some extent. When the filament is sufficiently small with respect to the valve diameter D, the influence of n / d may be considered to be small. Here, these relationships are expressed as follows: 1.0 <n / d ≦ 4.2 (1) 0.05 ≦ d / D ≦ 0.15 (2) or d / D <0.05 (3) If it is set to be such that, the shape factor is improved.

The relationship between the length n of the filament 6 and the coil diameter d and the relationship between the coil diameter d and the valve diameter D are experimental, and the experimental results are shown in FIG. FIG. 4 shows n on the horizontal axis.
/ D, and the vertical axis indicates the shape factor. The closer the shape factor is to 1, the better the return rate of the infrared rays to the filament and the higher the percentage of re-absorption by the filament. From this characteristic diagram, it can be seen that when d / D <0.05, the influence of the change in n / d is small and there is no particular restriction, and a high shape factor can be obtained at any time.

Conversely, when d / D> 0.15, the filament diameter d is larger than the bulb diameter D, so that a certain length is required, which is not practical. 0.05 ≦ d / D ≦
It is in the range of 1.0 <n / d ≦ 4.2 that the shape factor is improved over the case of n / d = 1 in the range of 0.15. Therefore, if the above expressions (1) and (2) are satisfied or the expression (3) is satisfied, the lamp efficiency can be improved as compared with a lamp without an infrared reflective visible light transmitting film.

Next, the relationship between the size of the lamp 1 and the reflecting mirror 10 was examined, and the results will be described. In the lamp 1 having this type of structure, the bulb 2 has a spherical shape. Therefore, when the light radiated toward the rear of the lamp 1 is reflected at the top of the reflecting mirror 10, a part of the reflected light is transmitted to the bulb 2. , And is reflected backward again. This reflection is repeatedly scattered, and a desired light beam may not be obtained. For this reason, the size of the reflector 10 and the size of the lamp 1 were examined.

FIG. 5 schematically shows the reflecting mirror 10 and the lamp 1. Since the reflector is by using a part of the spheroidal shape as a reflecting surface of the length of the major axis of the spheroid and a, the focal point of the ellipse F _r, the outer diameter of the spherical valve 2 D, the valve center O
And In this context, the visible light reflected by the reflection mirror can be prevented from scattering against the valve satisfies D / a ≦ 0.25 ... (4 ) OF r dimension between ≦ 2mm ... (5) There is a need.

That is, if the bulb 2 is too large with respect to the reflecting mirror 10, the light reflected by the reflecting mirror 10 hits the bulb and scatters the light, so that a desired light beam cannot be obtained. It is known that when the valve center O moves to the right or up and down in FIG. 5 with _respect to the focal position Fr, the reflected light becomes inward. In this case, the reflected light easily hits the bulb. Conversely, when the center O of the bulb is displaced to the left in FIG. 5 with _respect to the focal position _Fr , the distance between the reflecting mirror 10 and the bulb 2 becomes short, and in this case also, the reflected light easily hits the bulb. In consideration of such conditions, the size and position of the valve must be considered.

Therefore, the results of experiments on these factors will be described. FIG. 6 shows a light distribution pattern of the beam light, in which a beam of visible light from a light bulb with a reflecting mirror is irradiated downward, and the illuminance distribution at a distance of 1 m immediately below the lamp is measured. Patterns that can be actually used are indicated by judgments “circle” and “double circle”, and “triangle” and “x”
Is a pattern that should be avoided. Table 1 shows that O and _Fr
Are examined, and it is examined which of the light distribution patterns in FIG. 4 is similar when the value of D / a is changed.

[0042]

[Table 1]

From Table 1 above, it is considered that an acceptable light distribution can be obtained if D / a ≦ 0.25, and if D / a ≦ 0.20, scattering by the bulb does not occur. It goes without saying that the smaller D is, the better.

[0044] Further, Table 2 are those as D / a = 0.25, it was examined the relationship between the position of the focal point F _r of the valve center O. Position of the valve center O is the reflector closer relative to the focal F _r, i.e. a case in which align to the left in FIG. 5 "-O
And F _r ", the position of the valve center O conversely away from the reflector relative to the focal F _r, i.e. to a case in which closer to the right side in FIG. 5 as" + OF _r ".

[0045]

[Table 2]

From the above Table 2, the distance between O and _Fr is ± 2.0.
Within the range of mm, an acceptable light distribution is obtained, and the smaller D / a, the better. From these facts, it can be seen that it is sufficient to satisfy the expressions (4) and (5).

The present invention is not limited to the above embodiment. That is, the coil axis of the coil filament 6 in the example of FIG. 1 shows an example of a lamp that is disposed along the valve axis O _1, as the lamp 1 of the second embodiment shown in FIG. 7, the filament 6a there may be a structure in which in a posture crossing the direction of 90 degrees with respect to the valve axis O _1.

Further, as in the third embodiment shown in FIG. 8, a mirror-equipped lamp to which a light-transmitting cover 20 such as a front lens of a front light-emitting opening 12 of a reflecting mirror 10 is attached. There may be. In the case of such a structure, the cover 20 can prevent the glass fragments of the bulb 2 from dropping or scattering when the bulb 1 is broken.

As described above, the front projection port 12 of the reflecting mirror 10
If the cover 2 is closed by the cover 20, there is a concern that the temperature of the reflector body 11 will further increase. However, when an infrared-reflective visible light transmitting film is formed on the inner surface or the outer surface of the bulb 2 like the electric bulb of the present invention, If a heat load is not applied to the reflector 11 and the reflecting mirror main body 11 is made of aluminum, the thermal strength is increased, so that the reflector can be used in practice.

If the reflecting mirror body 11 is made of aluminum, mechanical connecting means such as clamping bands and screws are used in addition to the means using adhesive when the bulb 1 is mounted on the reflecting mirror 10. Also becomes possible.

The bulb 1 of the present invention is not limited to a spherical bulb, and as shown in FIGS. 9 and 10 as a fourth embodiment and a fifth embodiment, respectively, an elliptical bulb. 120 or 130.

When these elliptical spherical valves 120 and 130 are used, the coil axis of the filament 6 housed therein is arranged along the major axis of the ellipse, and the filament 6 is positioned at the first and second focal points of the ellipse. It is desirable to configure so as to exist at the positions of F ₁ and F ₂ .

By doing so, the valves 120, 130
The infrared rays reflected by the infrared-reflective visible light transmitting film 9 formed on the inner surface or the outer surface are surely returned to the filament 6, and the lamp efficiency is improved.

In the spherical valve 2, it is desirable that the thickness of the valve top portion on the side opposite to the crushing sealing portion 3 be 1.2 to 1.8 times as thick as the side wall portion. This makes it possible to balance the heat with the crush-sealing portion 3, which is effective in preventing the occurrence of thermal strain, and can prevent the valve from being damaged.

Further, the present invention is not limited to a halogen bulb as a bulb to be used, and may be a general incandescent bulb. The sealing structure at the end is not limited to a crushed sealing type, but is a stem sealed bulb. The structure fixed to the reflecting mirror 10 is not limited to the adhesive 15.

The reflector main body 11 is not limited to aluminum, but may be other metals or may be formed of glass. When the reflecting mirror body 11 is formed of glass, the infrared absorbing film 14 is not required, and only the dichroic film 15 may be used.

[0057]

According to the first to third aspects of the present invention, a bulb in which the infrared ray absorbing efficiency of the filament is improved and the luminous efficiency is improved is attached to the reflector.
Since the infrared light emitted from the bulb itself is small, the heat reaching the reflecting surface of the reflector is reduced, and the infrared component in the light radiated forward from the reflector is reduced, and the infrared radiation emitted behind the reflector is also reduced. And the efficiency of the device is improved. For this reason, there is an advantage that the thermal influence of the irradiation object is reduced and the temperature rise of the appliance is reduced, so that the air conditioning load and the like can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a halogen lamp with a reflector according to an embodiment of the present invention.

FIG. 2 is a characteristic diagram showing a relative spectral output of the embodiment.

FIG. 3 is a configuration diagram of the spherical light bulb of the embodiment.

FIG. 4 is a characteristic diagram showing lamp efficiency according to the embodiment.

FIG. 5 is a schematic diagram illustrating the relationship between the size of the lamp and the reflector according to the embodiment.

FIG. 6 is a view showing an example of a light distribution pattern according to the embodiment;

FIG. 7 is a sectional view of a halogen lamp with a reflector according to a second embodiment of the present invention.

FIG. 8 is a sectional view of a halogen lamp with a reflector according to a third embodiment of the present invention.

FIG. 9 is a sectional view of a halogen lamp with a reflector according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view of a halogen lamp with a reflector according to a fifth embodiment of the present invention.

FIG. 11 is a configuration diagram of a spherical light bulb showing a sixth embodiment of the present invention.

FIG. 12 is a characteristic diagram showing lamp efficiency according to the embodiment.

FIG. 13 is a characteristic diagram showing a life characteristic of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Halogen lamp 2 ... Bulb 6 ... Filament 9 ... Infrared reflective visible light transmission film 10 ... Reflector mirror 11 ... Reflector main body 12 ... Front opening part 13 ... Lamp mounting part 14 ... Infrared absorbing film 15 ... Dichroic film.

Claims (3)

[Claims] 1. A reflecting mirror having a curved surface having an opening at a front portion, a neck portion at a rear portion, and a visible light reflecting infrared ray transmitting film formed at an intermediate portion; A translucent airtight container having a substantially spherical body or a substantially spheroidal body on which a reflective visible light transmitting film is formed, a filament disposed in the airtight container, one end of which is connected to the filament and the other end of which is transparent. The inner lead wire arranged in the sealing portion of the light-tight hermetic container, the external lead wire electrically connected to the inner lead wire inside the sealing portion of the light-tight hermetic container, and led out from the sealing portion are And an incandescent light bulb. 2. The light bulb with a reflector according to claim 1, wherein the incandescent light bulb operates at a voltage of 6 to 36V. 3. When the focal point of the reflecting mirror is Fr, the outer diameter of the substantially spherical body or the substantially spheroidal body is D, and the center of the translucent airtight container is O, D / a ≦ 0.25. And OF
2. The reflector-equipped light bulb according to claim 1, wherein a distance between r ≦ 2 mm is satisfied.