JP2548005Y2 - Reflector for halogen lamp and front protective glass - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a halogen lamp having a reflector and a front protective glass, and particularly to sealing between the reflector and the front protective glass. The present invention relates to an improved reflector for a halogen lamp and a front protective glass.

(Prior Art) In recent years, halogen lamps that are compact and provide high illuminance have attracted attention as a new light source in many fields such as for store lighting.

Conventionally, as shown in FIG. 8, a halogen lamp 1 includes a halogen lamp 1 and a glass reflective substrate 2 surrounding the halogen lamp 1 and having a spheroidal or parabolic concave portion with an enlarged front portion. The halogen bulb 1 is sealed at the center of the reflecting mirror 4 by a sealing agent 5 made of cement or the like inserted from the front side of the reflecting mirror 4. Stopped and fixed.

In the conventional halogen lamp, since the halogen bulb 1 is exposed, the halogen bulb 1 is touched with bare hands, or the halogen bulb 1 self-explodes due to the high temperature generated by the halogen bulb 1 itself, and adversely affects surrounding objects. There was a risk of giving.

Therefore, recently, in consideration of the safety of the lamp, a halogen lamp in which a front protective glass is attached to a front opening of the reflecting mirror 4 by a mechanical method or a chemical method has begun to appear.

(Problems to be Solved by the Invention) However, the mounting by the above-described mechanical method has problems in terms of complexity and economical efficiency of the mounting method.

Further, in the above-mentioned chemical mounting method, an organic or inorganic adhesive is used, but when sealing the front protective glass, the adhesive is solidified unless the adhesive is applied within a few minutes after application. There is a problem that the force is reduced, the adhesive is deteriorated by the heat radiation of the halogen bulb, or the filler contained in the adhesive is vaporized and adheres to the inside of the halogen lamp.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reflector for a halogen lamp and a front protective glass provided with a sealing agent having excellent heat resistance and economical adhesive strength. I do.

[Constitution of the Invention] (Means and Actions for Solving the Problems) In order to achieve the above object, the present invention provides a glass base having a spheroidal or parabolic concave portion with an enlarged front surface. In a reflecting mirror for a halogen lamp which is formed of a reflective substrate and is used by bonding a front protective glass to a front opening of the reflective substrate, a bonding surface with the front protective glass formed in the front opening and a bonding surface The low-melting glass that has been applied and calcined is used as a sealing agent. Adhesion between the mirror and the front protective glass can provide sealing without thermal degradation.

In addition, the present invention provides a front protective glass for a halogen lamp, which is used by being joined to a front opening of a reflecting mirror made of a glass reflecting substrate having a spheroidal or parabolic concavity with a widened front surface as a base. In the above, since it is configured to include a bonding surface with the reflecting mirror formed on the periphery and a low melting point glass applied and temporarily calcined on the bonding surface, the bonding surface formed on the periphery of the front protective glass is By using the low-melting glass that has been applied and calcined as a sealing agent, the reflection mirror and the front protective glass can be bonded without thermal deterioration.

(Example) Hereinafter, an example of the present invention is described with reference to drawings.

FIG. 1 is a diagram showing an outline of a halogen lamp according to an embodiment of the present invention. The same parts as those in FIG. 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 1, the front protective glass 6 is sealed to the front opening of the reflecting mirror 4 with a sealing agent made of low melting point glass in consideration of the light distribution and safety of the halogen lamp. FIG. 2 shows a sealing portion 7 between the reflecting mirror 4 and the front protective glass 6.
As shown in the figure, the periphery of the front opening of the glass reflecting substrate 2 which is the base of the reflecting mirror 4 has a depth substantially equivalent to the thickness of the front protective glass 6. A bonding surface 2a having a step is formed. A bonding surface 6a having a step is formed on the periphery of the front protective glass 6 sealed to the bonding surface 2a formed on the reflection substrate 2 so as to face the step of the bonding surface 2a of the reflection substrate 2. ing. Reflector 4
The front protective glass 6 and the front protective glass 6 are bonded to each other at the joint surfaces 2a and 6a with a sealing agent made of a low-melting glass 8 having a thermal expansion coefficient close to that of the reflective substrate 2 and the front protective glass 6.

In FIG. 2, the front protective glass 6 has a somewhat arc shape, which is formed when the front protective glass 6 is stamped and manufactured by a press. When it is cut out in a circle, it is formed flat without forming an arc.

Next, a method of bonding the reflecting mirror 4 and the front protective glass 6 having the above configuration will be described with reference to FIGS.

(Coating Step) As shown in FIG. 3, a vehicle (organic solvent) is added to powdery low-melting glass uniformly to form a paste on the joint surface 2a formed at the front opening of the reflecting mirror 4. Low melting glass 8 is applied. In addition, the vehicle varies depending on the coating method, but when coating with a dispenser, use a solvent in which cellulose is dissolved in butyl ether, ethyl ether, or α-terpineol, and the ratio between the powdered glass and the vehicle at this time is: Powdered glass: vehicle = 10-20: 1 wt%. The low-melting glass 8 which has been made into a paste by adding a vehicle is applied to the joint surface 2a by a dispenser.

(Preliminary Firing Step) The reflecting mirror 4 coated with the low-melting glass 8 is placed in a heating furnace and heated according to the schedule shown in FIG.
After heating at a calcination temperature of 300 to 380 ° C for about 10 minutes, gradually cool
The binder in the powdered glass is substantially decomposed and sublimated by the heating at 380 ° C., and hardly remains in the powdered glass. A low-melting glass 8 as a sealing agent is adhered and solidified on the joining surface 2a of the reflecting mirror 4 taken out of the heating furnace.

(Sealing Step) Subsequently, when the front protective glass 6 is sealed to the reflecting mirror 4, the bonding formed on the peripheral surface of the front protective glass 6 on the bonding surface 2 a to which the low-melting glass 8 is adhered. Overlap the surface 6a,
It is placed in a heating furnace and heated according to the schedule shown in FIG. After heating at a bonding temperature of 400 ° C and 450 ° C for about 10 minutes, gradually cool. The reflecting mirror 4 taken out of the heating furnace has a front protective glass 6 on its joint surface 2a.
Is sealed. Note that this sealing step does not need to be performed immediately after the calcination step, and since the low-melting glass 8 is used as a sealing agent, the low-melting glass 8 does not change over time. After storage, the required number of sealing steps can be performed. In addition, since the bonding temperature is 400 to 450 ° C., the inside of the halogen lamp after hermetically sealed and slowly cooled has a negative pressure, and when the lamp is turned on, the temperature in the halogen lamp is lower than the bonding temperature. The internal pressure does not become excessive.

In this way, the front protective glass 6 is sealed to the reflecting mirror 4 by the low melting point glass 8 through the application step, the preliminary firing step, and the sealing step.

In the above embodiment, the low-melting glass 8 is applied to the bonding surface 2a formed at the front opening of the reflecting mirror 4. However, the present invention is not limited to this. For example, as shown in FIG.
The same applies when the low-melting glass 8 is applied to the bonding surface 6a formed on the peripheral edge of the front protective glass 6. That is, after the vehicle is applied and the low melting glass 8 in the form of paste is applied to the bonding surface 6a of the front protective glass 6, the reflecting mirror 4 and the front protective glass 6 are sealed through the above-mentioned preliminary firing step and sealing step. Be worn. Further, if the front protective glass 6 is formed by drawing a glass plate material and cutting it out in a circular shape, instead of press punching, the front protective glass 6 is formed flat.
By forming the joining surfaces 6a, 6a on both surfaces as shown in the drawing, the surface on which the joining surfaces are formed is not selected, and workability is improved.

Further, in the above embodiment, the halogen bulb 1 is inserted from the front of the reflecting mirror 4, but the present invention is not limited to this.
As shown in the figure, a type in which the halogen bulb 1 is inserted from the back of the reflecting mirror 4 and cemented to the reflecting substrate 2 may be used.

In addition, the present invention is not limited to the above-described embodiment, and can be variously modified without departing from the gist of the present invention.

[Effects of the Invention] As described above in detail, according to the reflector for a halogen lamp and the front protective glass of the present invention, a low-melting glass is used as a sealing agent for sealing the reflector and the front protective glass. As a result, even when the temperature in the halogen lamp becomes high, the sealing agent does not deteriorate due to heat, and a stronger bonding strength can be obtained with respect to bonding between glasses than other bonding agents.

In addition, since low-melting glass as a sealing agent is applied and pre-baked, it does not change over time even when stored for a long period of time, so that it can be mass-produced at a time and required when necessary. Only numbers can be used. Therefore, manufacturing costs can be reduced.

Also, since the binder is decomposed and sublimated during the solidification of the powdered low-melting glass in the calcination step, it does not remain as an impurity in the halogen lamp, so that the reflective film applied to the reflective substrate does not deteriorate, and Protective glass and halogen bulbs do not get dirty.

In addition, when sealing the front protective glass to the reflector with a halogen bulb inserted and cement sealed, the sealing is performed at a temperature of 400 ° C. or higher, so after sealing without using a decompression means in particular. The negative pressure inside the halogen lamp is negative, so even if the temperature rises due to the lighting of the lamp, the internal pressure does not become excessive and the adhesive strength and safety are high. A halogen lamp which is difficult to scatter is obtained.

[Brief description of the drawings]

FIG. 1 is a view showing a configuration of a halogen lamp according to an embodiment of the present invention, FIG. 2 is an enlarged view of a joint between a reflector and a front protective glass, and FIG. 3 is a view showing a reflector with a sealing agent. , FIG. 4 is a diagram showing a preliminary firing schedule, FIG. 5 is a diagram showing a sealing schedule, FIG. 6 is a diagram showing a front protective glass with a sealing agent,
FIG. 7 is a view showing another embodiment of the present invention, and FIG. 8 is a view showing a conventional halogen lamp. 2 ... reflection substrate, 2a ... joining surface, 3 ... reflection film, 4 ... reflection mirror,
6: Front protective glass, 6a: Joining surface, 8: Low melting point glass.

Claims (2)

(57) [Scope of request for utility model registration] 1. A reflective glass substrate having a base having a spheroidal or parabolic concave part with an enlarged front surface as a base, a front protective glass is bonded to a front opening of the reflective substrate, and a halogen is internally provided. In a reflecting mirror for a halogen lamp used by fixing a light bulb, a joining surface with the front protective glass formed in the front opening portion, and a coating and coating method for the joining surface.
And a low-melting glass which is heated to a predetermined temperature or more in an air furnace after being preliminarily fired to perform hermetic sealing. 2. A reflector made of a glass having a spheroidal or paraboloid-shaped concave part having a front surface expanded as a base and joined to a front opening of a reflector used with a halogen bulb fixed therein. In the front protective glass for a halogen lamp used in the present invention, a bonding surface with the above-mentioned reflecting mirror formed on the peripheral edge is coated with the bonding surface and pre-baked, and then heated to a predetermined temperature or higher in an atmospheric furnace to hermetically seal. And a low-melting glass for performing the above-mentioned.