JPS6070653A - Metal halide lamp - Google Patents

Abstract

PURPOSE:To prevent a fluorescent film from being damaged and a light distribution characteristic from being deteriorated by specifying a position of the restricted end of the fluorescent film or a diffusion film formed on the internal surface of an outer tube, with respect to the dimension with which an elastic conductor thin wire for supplying electric power to a luminous lamp is held inside the outer tube. CONSTITUTION:A luminous lamp 3 is provided inside an outer tube 1 by means of stem frames 7, 8 together with a glow lamp 4, resistance 5, and a bimetal switch 6. A straight tube inner diameter D of the neck portion 1a of the outer tube 1 is made 48.0mm., and the internal surface of the outer tube is coated with a fluorescent film 9. A curvature radius R of a bent part 1b where the straight tube inner diameter of the neck portion 1a gradually increases is made 40mm., and an angle theta of an elastic conductor small-gage wire 2 for supplying power to the luminous lamp 3 is made 24 deg.. A distance l from the deepest end of the straight tube of the neck part 1a to the restricted end of the fluorescent film 9 is set to satisfy a relation: l>=Rsintheta, i.e., 18.0mm.. In such a way, a metal halide lamp can be formed without damaging the fluorescent film and a diffusion film deposited on the outer tube inner surface and deteriorating a light distribution characteristic.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a metal halide lamp. 0 Construction of conventional examples and their problems Metal halide lamps are used as white light sources with high efficiency and high color rendering properties in fields such as general lighting. NaI-TRI-InI yarn, which is becoming popular, and is used as an additive in arc tubes, 5
Among these metal halides, NaI
It is included in most additive systems because it has a high visible light emission efficiency and contributes to arc stabilization. However, due to the well-known photoelectric effect, Na During long-term operation, Ha passes through the quartz of the arc tube and precipitates inside the outer bulb, and the iodine remaining inside the arc tube does not adversely affect the lamp characteristics, so various countermeasures have been adopted. One type of mounting structure is known in which the current supply conductor that passes through the side of the arc tube is thinned and placed as far away from the arc tube as possible. The inconvenience is
Because the elastic thin wire that is the current supply conductor and the assembly mount components (such as the arc tube) are larger than the diameter of the neck of the outer tube, the thin wire must be bent while inserting the mount into the outer tube. At this time, the thin wire passes through the inner surface of the outer tube while sliding, so if the inner surface of the outer tube is coated with a phosphor film or a diffusion film,
Particularly when these are relatively weakly adhered by the electrostatic coating method, part of this film may be peeled off. If part of the phosphor film or diffuser film is peeled off, a linear film may be formed. This results in an unsightly appearance and greatly reduces the product value, and there is also the risk that powder from the peeled off coating may adhere to the mounting member and cause problems such as deterioration of the conductivity of parts such as bimetal switch contacts. be.

Purpose of the Invention The present invention has been made based on the above circumstances, and
Even if the phosphor film or diffuser film adhered to the inner surface of the outer tube is formed by an electrostatic coating method, no film will be formed, the unsightly appearance will be eliminated, and the product value will be increased. It also provides a metalno-ride lamp with improved quality and reliability.

Structure of the Invention The metal halide lamp of the present invention has a metal halide lamp that passes through the side of an arc tube that is held inside an outer tube that has a base at its end and a phosphor film or a diffusion film formed on its inner surface. The conductor that supplies power to the arc tube of the lever is made of a thin elastic wire, and the maximum inclination angle between the tangent of the thin wire located from the center of the arc tube toward the base and the lamp axis is θ( Every time),
When the inner diameter of the neck straight tube of the outer tube is D (+m), and the distance from the innermost end of the neck straight tube to the normal end of the phosphor film strip or diffusion film (1 (mm)) , approximately approximates a curve with a radius of curvature R(ii) drawn around a point on a line perpendicular to the lamp axis at the innermost end of the neck straight pipe and at a distance of D + H from the lamp axis. at a portion where the inner diameter of the outer tube gradually increases from the inner diameter of the straight tube at the neck portion,
The normal end of the phosphor film or diffusion film must be positioned so as to satisfy the relationship l≧Rsinθ, and the original characteristics obtained by using the phosphor film or diffusion film may be impaired. 0 Description of Embodiments The present invention will be described below with reference to the drawings.

As shown in Fig. 1, the neck portion 1a of the outer tube 1 has a straight tube shape, and the inner diameter of the outer tube 1 gradually increases from the innermost end of this straight tube and continues to the neck portion 1a of the outer tube 1. and curved part 1b
is formed. The curve of the curved portion 1b is on a line perpendicular to the lamp axis at the innermost end of the straight tube, with the inner diameter of the straight tube of the neck portion 1a being D (+m), and is i from the lamp axis.
The radius of curvature R (+m
) approximately approximates the curve. On the other hand, thin wire 2 with elasticity
When inserting the mount into the outer tube 1, as shown in FIG. be in contact with As shown in Fig. 1, when the maximum inclination angle of the tangent to the thin line 2 with the lamp axis Y-Y is θ (degrees), a point is made on the inner surface of the outer tube 1 at an angle θ with respect to the lamp axis Y-Y. If we draw a straight line A-B that touches at point C, point C corresponds to the point where the thin wire 2 finally touches the inner surface of the outer tube 1 when inserting the mount into the outer tube 1, and before that, the thin wire 2 is bent. Point C and also neck part 1a
It comes into contact with the inner surface of the outer tube 1 on the side.

Therefore, point C becomes the deepest point at which the film is to be peeled off. By the way, if the regular end of the phosphor film or diffuser film is placed deeper than point C, no film portion will occur. However, the deeper the normal end is placed, the more problems arise in terms of manufacturing and light distribution. In other words, as a manufacturing problem, when applying a coating using an electrostatic coating method, it is difficult to provide a regulated end on a curved part with a larger diameter than the straight pipe at the neck. Afterwards, the coating on the curved part is removed using a rotating rubber plate, etc., to re-regulate the pipe, but in this case, the larger the diameter is than the inner diameter of the straight pipe, the longer it takes to re-regulate, and the finished end of the pipe does not have a beautiful finish. Another problem when the standard end is set further back is that the light distribution curve of the lamp becomes uneven, making it difficult to control the light distribution of the fixture.

Under these circumstances, it is desirable to set the minimum standard distance within a range where film edges do not occur. The present invention has been made in view of the above, and is made by passing through the side of an arc tube held inside an outer tube having a cap at the end and a phosphor film or a diffusion film formed on the inner surface. The conductor that supplies power to this is made of a thin elastic wire, and the maximum angle of inclination between the tangent of the thin wire located from the center of the arc tube to the cap and the lamp axis is θ (degrees). The inner diameter of the straight pipe at the neck of the outer pipe is D (yxm),
When the distance from the innermost end of the straight pipe section to the standard end of the phosphor film or diffuser film is e (+u), the distance between the innermost end of the straight pipe section and the lamp axis is on a line orthogonal to the lamp axis. The radius of curvature R drawn around the point P located at a distance of -+H from
The normal end of the coating is located at a portion where the inner diameter of the outer tube gradually increases from the inner diameter of the straight tube section, approximately approximating the curve of (tnm), so as to satisfy the relationship (1=Rs1nθ). .

Next, one embodiment of the present invention will be described using the drawings.

Figures 3 and 4 show an embodiment of the present invention with a rating of 40
A front view and a side view of a 0W metal halide lamp are respectively shown. In these figures, the arc tube 3 is made of quartz with an inter-electrode distance of 42 mm and an outer diameter of 22.5 mm, and contains NaI, ScI3. It is filled with mercury and argon gas, and is provided in the outer tube 1 by stem frames 7 and 8 together with a glow tube 4 for starting assistance, a resistor 6, a bimetal switch 6, and the like. The maximum diameter of outer tube 1 is 'r2
omm, the straight pipe inner diameter of the neck part 1a is 48.0ffJI
1, and the inner surface of the outer tube is coated with YVO4 by electrostatic coating method.
: A phosphor film 9 made of Eu+3 is deposited. The radius of curvature R of the curved portion 1b where the straight pipe inner diameter of the neck portion 1a gradually increases is 4()mu, and the angle θ of the thin wire 2 is 24°.
It is.

Therefore, R51nθ-16,:311ff. The distance l from the innermost end of the straight pipe of the neck part 1"a to the standard end dimension of the phosphor film 9 is 18.○".When a lamp with such a configuration was prototyped, no film part was generated. There were no irregularities in the light distribution curve, and there was no electrical disconnection at the bimetal switch contacts.

As described in detail, the present invention eliminates the occurrence of scratches on the phosphor film and diffusion film adhered to the inner surface of the outer tube, eliminates unsightly appearance, has high commercial value, and improves light distribution. It is possible to provide a metal halide lamp with stable quality, which has the same characteristics as conventional products and does not deteriorate the conductivity of parts such as bimetal switch contacts.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining the present invention in detail, Fig. 2 is a diagram showing the state in the middle of inserting the mount into the outer tube, and Fig. 3 is a part of a metal halide lamp which is an embodiment of the present invention. The cutaway front view and FIG. 4 are similarly partially cutaway side views. 1...Outer tube, 2...Thin wire, 3...
・・Earth tube, 9・・・・phosphor film, 1o・・・・
・Case. Name of agent: Patent attorney Toshio Nakao and 1 other person @1
Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A device that supplies power to the arc tube by passing through the side of the arc tube held inside the outer tube, which has a cap at the end and a phosphor film or a diffusion film formed on the inner surface. The conductor is made of a thin elastic wire, and the maximum angle of inclination between the tangent of the thin wire located from the center of the arc tube to the cap side and the lamp axis is θ (degrees), and The inner diameter of the tube is D
(mi), when the distance from the innermost end of the neck straight pipe to the normal end of the phosphor film or diffusion film is 4 (distance),
The curve approximately approximates a curve with a radius of curvature R (mm 2 ) drawn around a point located at a distance of +H from the lamp axis on a line perpendicular to the lamp axis at the innermost end of the neck straight pipe. A metal characterized in that the normal end of the phosphor film or the diffusion film is located at a portion where the inner diameter of the outer tube gradually increases from the inner diameter of the straight tube at the neck portion so as to satisfy the relationship β≧R sin θ. no ride lamp