JPS6113547A - Incandescent bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an incandescent lamp with high efficiency (and also reduced C1 infrared radiation).

[Technical background of the invention and its problems]

The applicant previously proposed an incandescent light bulb in which a tube-shaped bulb is provided with a visible-transmitting infrared reflective coating on either the inner or outer surface, and a C-shaped tungsten filament is enclosed near the center line of the bulb. Of the light emitted from the filament of a light bulb, visible light passes through an infrared reflective film and is reflected to the outside (2), while infrared light is shelled by an infrared reflective film and returns to the filament (-), heating it. He discovered that the efficiency of light bulbs could be further improved by increasing the length of the filament to a certain extent in relation to the large amount of reversible C2 consumed. 5
5-98459)).

Therefore, in order to increase the infrared reflectance of this type of incandescent light bulb C2, it is sufficient to increase the number of layers in which high refractive index layers and low refractive index layers constituting the infrared reflective film are alternately laminated. It is known. However, on the other hand, as the number of layers increases, manufacturing (=many processes and labor is required, and it is unavoidable that it will be expensive).Furthermore, as the number of layers increases, the infrared reflective film tends to peel off easily. As a countermeasure against this, the applicant proposed a method of dipping the glass tube for the bulb in a gold layer compound solution (two cloths) and firing it in an oxidizing atmosphere to form an oxide. A method was developed to form a 2M infrared reflective film by simultaneously forming a high refractive index layer or a low refractive index layer on both sides, and repeating this process to form a 2M infrared reflective film. According to this method, it is possible to form a double infrared reflective film, or in other words, twice the number of layers, with the same number of man-hours and effort.
It has the advantage that a reflective film with sufficient infrared reflectivity can be easily formed in a short time, and since the number of layers of the formed reflective film is not so large, there is no risk of peeling.

However, when infrared reflective films are formed on both the inner and outer surfaces of the bulb, the two reflective films face each other with the glass in between, so the visible light transmittance increases. In some cases, the efficiency may be lower than when no infrared reflective film is provided.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an incandescent light bulb having an incandescent light bulb provided with an infrared-reflecting coating on both the inner and outer surfaces of the bulb (in which the bulb is provided with an infrared-reflecting coating) and which is more efficient than a case without an infrared-reflecting coating.

[Summary of the invention]

If the length of the filament is made to be more than twice the inner diameter of the bulb, the infrared rays emitted from the filament in the diagonal direction, i.e. between the radial direction and the tube end direction (twice) will be effectively returned to the filament (two times, increasing the efficiency). This compensates for the decrease in visible light transmittance caused by the double infrared reflecting film.

[Embodiments of the invention]

The details of the present invention will be explained with reference to FIG. (1) Visible light transmitting and infrared reflective coatings provided on both inner and outer surfaces (2)
(4), (4) are sealing parts formed by crushing and sealing both ends of the valve (1), and (5), (5) are inside these sealing parts (4), (4) (= buried). Molybdenum introduced foil, (
61, (6) connect these two introductory foils (5), (5) l, inside the valve (1) C: 4 inner conductors, (the force is between the inner conductors t61. (61 (two mounted) The linear tungsten coil filament located approximately at the center of the bulb (1), (8), +8) is the anchor that supports this filament (7), (9), (9) is the introduction foil (5),
(5) (Two connected and sealed part (4), end face of (4) (
This is the cap with two attachments. The bulb (1) is then filled with argon and the necessary halogen. Then, the inner diameter of the bulb (1) is Dmm, and the filament (
5) Let the length be l mm.

The visible light transmitting infrared reflecting films (2) and (3) are enlarged in FIG.
2) High refractive index layer (2H), (3H) etc.
(upper left sheeting) and low refractive index layers (2L), (3L) (upper right sheeting) made of silica (SiOz) etc. are alternately layered for a total of 10 layers on one side (two sheets (= formed). .

Such infrared reflective films (2) and (3) are obtained (the second method is as follows. First, an organic titanium compound such as tetraisopropyl titanate is dissolved in an organic solvent such as acetic acid ester, and the titanium content is 2 to 2. 10%.

Viscosity approximately 1. Adjust the Ocps titanium solution, and separately,
Organosilicon compounds such as ethyl silicate are dissolved in organic solvents such as acetate (2 to 20% silicon content).
10 inches, viscosity approximately 1. Adjust the Ocps silicone liquid.

Then, both the inner and outer surfaces of the quartz glass tube for the bulb are immersed in the above-mentioned titanium solution, pulled up at a predetermined speed, and fired for about 5 minutes in an oxidizing atmosphere such as air to form a high refractive index layer made of titanium oxide. 2H) and (3H) are formed. Next, both the inner and outer surfaces of this glass tube are immersed in the above silicone liquid (= =
A low refractive index layer (2L) made of silica is formed by pulling it up at a predetermined speed and baking it in an oxidizing atmosphere such as air for about 5 minutes.
3L).

In this way (2) high refractive index layer (2H), (3H)
The low refractive index layers (2L) and (3L) may be alternately formed.

Next (-5 like this), both sides (two infrared reflective coatings (
2), the light transmittance spectrum from the traveling direction of the quartz glass bulb formed with +3> is shown in Figure 3 (2).
The vertical axis (dual transmittance is taken with a quartz glass bulb without any infrared reflective film as 100) in units of nnn, which is two wavelengths, and the curve shows the transmittance spectrum.

As is clear from this spectrum, it can be seen that the transmittance of this example is lower in both the near-infrared and visible regions than the one with only one infrared reflective film (compared to the other).

Next, the principle of operation of this light bulb is explained in Figure 4 (=Thus, in Figure 1, (1) is the bulb wall, (the force is the filament.
degree (2) At an angle of incidence close to the bulb wall (1) (2) the incident light (A
), near-infrared m (AI) is reflected from the filament (
Visible light (A2) passes through the bulb wall (1) and is emitted to the outside. Also, the filament (consisting of the same part of the force and with a larger angle of incidence) (9th near-infrared g of the light (B) incident on 11 (B
l) is similarly reflected, but as shown in the figure (nifilament (if the force is short, this reflected near-infrared scarlet (B8)
The extension line of the filament (7) (1 returns only increases efficiency) 2 is useless, but the visible light (B,) is transmitted through the bulb wall and emitted to the outside. Therefore, in this case, if the filament (7) is long enough, the reflected near infrared rays (B1
) should also be useful for filament (force (2) feedback and efficiency improvement (2).In other words, the longer the filament (7) is, the higher the efficiency (2). ] (Lup wall (1)
(-The distance that human emitted light (C) passes through each layer of the infrared reflective film t2L (3) becomes longer, so the wavelength range of maximum reflectance changes, and near infrared light (C1) also passes through the bulb wall (1). In other words, if the filament (7) is longer than -short (= longer), the feedback rate of near-infrared rays will reach a plateau and will not improve further, and the efficiency will decrease significantly as the load per unit tube length 9 becomes smaller. As a result, efficiency decreases.

This principle of operation is based on the single-piece metal I-logen bulb shown in Figure 5.
The same applies to the second case. Incidentally, the same parts C''- of the light bulb in FIG. 5 are given the same reference numerals, and the explanation thereof will be omitted.

Next, in both the embodiments shown in Figs. The results are shown in Figure 6 (2).

The diagram is on the horizontal axis (Ni b 幺 is an anonymous number and 9, and on the vertical axis, the ○ mark is in Figure 5)
= indicates the second embodiment with a valve inner diameter of 13 am, Δ indicates the first embodiment with a valve inner diameter IQ ms shown in FIG. 1, and the curve is a dotted line of the results of these embodiments. Note that the X mark indicates the result of early disconnection in the first example.

As is clear from Fig. 6, there is a clear correlation between l/D and efficiency improvement, and when l=/D < 2.0, the efficiency decreases by 2, meaning there is no point in providing an infrared reflective film. 2.
When 0≦l/D, it is obvious (the double efficiency improves, and the effect of providing an infrared reflective film can be seen. However, when l/i) becomes too large, early deception occurs frequently, and although it is not clear in the figure, the opposite effect occurs. (″-Since efficiency may decrease, l/D
It is better to stop at C2 below 18.0. Therefore, in C2 of the present invention, l/D was set to 2.0 or more.

Incidentally, experiments were conducted with various inner diameters of the valves, but all of them were approximately at C2 position on the curve shown in FIG. Furthermore, we experimented with two ordinary tube-type incandescent bulbs and obtained similar results.In addition, in a long tube-type bulb (two or more filaments were connected in series via a short-circuit wire) near the center line (= In addition, it was found that in the case of a bulb in which an infrared reflective film is formed on both the inner and outer surfaces of the bulb, l/D should be 2.0 or more for each unit filament. (The two light emitting parts are short-circuited to form a plurality of light emitting parts (the light emitting parts correspond to the above-mentioned unit filament 1').

It should be noted that each layer of the visible light transmitting infrared reflective film may be formed by a known method other than the above-mentioned method of applying an organic metal compound solution (= dip coating and baking).

〔Effect of the invention〕

The incandescent light bulb of the present invention is provided with a visible light transmitting infrared reflecting film formed by alternately layering a high refractive index layer and a low refractive index layer on both the inner and outer surfaces of the tube-shaped bulb, and near the center line of the bulb (two surfaces). A linear filament is sealed.In a product, the length of the filament is at least 2.0 times the inner diameter of the loop, so visible light from the filament passes through the infrared reflective film and is emitted to the outside world. The infrared rays are reflected by the infrared reflecting film and returned to the filament, which heats the filament and improves efficiency.Moreover, since the length of the filament is limited to C2 as mentioned above, the double infrared reflecting film Although the visible light transmittance is reduced, the infrared ray conversion rate is significantly improved, and as a result, the efficiency can be improved compared to when no infrared reflective film is provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the first embodiment of the incandescent light bulb of the present invention, FIG. 2 is a schematic enlarged sectional view of the part surrounded by chain lines in FIG.
The figure is a light transmission spectrum diagram of the visible light transmitting infrared reflective film, Figure 4 is an explanatory diagram showing the working principle of the present invention, Figure 5 is a sectional view of the second embodiment, and Figure 6 is a numerical value of the present invention. This is a graph showing the basis of the limitation. (1)...... Bulb +2),' (3)... Visible light transmitting infrared reflective film (2H), (3H)... Shima refractive index layer (2L
), (3L)...Low refractive index layer (power...
・・ Filament 7 ・・・・・・・−・ Length of filament D ・・・・・ Inner diameter of valve Agent Patent attorney Inoue -Male~

Claims (1)

[Claims] A tube-shaped bulb is provided with a visible light-transmissive infrared reflecting film formed by alternately layering a high refractive index layer and a low refractive index layer on both the inner and outer surfaces, and a linear filament is sealed near the center line of the bulb, wherein the above-mentioned An incandescent light bulb characterized in that the length of the filament is 2.0 times or more the inner diameter of the bulb.