JP5268026B2 - Lamp with outer tube - Google Patents

Description

The present invention protects the lamp body from external damage, prevents the lamp body from scattering due to rupture and destruction, and suppresses or reduces ultraviolet radiation harmful to the human body. The present invention relates to a lamp with an outer tube to which an outer tube to be accommodated is attached.

As this type of lamp, a metal vapor such as a metal halide lamp or the like, in which a lamp body composed of an arc tube or a lamp body composed of an arc tube and an airtight tube accommodating the arc tube is accommodated in an outer tube forming the outer shell of the lamp. There are a discharge lamp, a halogen lamp in which a lamp body composed of a light emitting filament and an airtight tube for accommodating the light emitting filament is accommodated in an outer tube forming an outer shell of the lamp. In these lamps with an outer tube, a mounting base for attaching a lamp body and an outer tube for housing the lamp body is formed on the base, and the outer tube is fixed to the mounting base with a heat-resistant adhesive. However, when the adhesive strength is reduced due to the deterioration of the adhesive over time, the outer tube may come off from the attachment base of the base and fall off.

Therefore, in order to prevent the outer tube from falling off due to deterioration of the heat-resistant adhesive, a metal vapor discharge lamp such as a metal halide lamp is proposed in which the outer tube is fixed to the base of the base by a bayonet mechanism as shown in FIGS. (See Patent Document 1). The lamp shown in FIG. 3 has a lamp body 51 composed of a ceramic arc tube 52 filled with metal halide, mercury, starting gas, and the like, and a quartz glass hermetic tube 53 that accommodates the arc tube. A metal halide lamp housed in an outer tube (protective tube) 54 made of hard glass that has a strength that can withstand the impact of bursting and that can absorb low-wavelength ultraviolet light that is difficult to absorb by an airtight tube made of quartz glass. An attachment base 56 for attaching the lamp body 52 and the outer tube 54 for housing the lamp body is formed on the lamp cap 55.

As shown in FIGS. 4A and 4B, the mounting base 56 of the base 55 is a cylindrical shape that supports and fixes one end side of the lamp body 51 to a disc body (flange portion) 58 that closes the opening 57 of the outer tube 54. The entire column 59 is formed in a projecting manner, and the entire structure is integrally formed of a steatite ceramic having a function as an insulator. In addition, the support | pillar 59 inserts the pinch seal part 60 of the airtight tube 53 which comprises the lamp | ramp main body 51 along the axial direction from the front-end | tip, and the slit 61 for fixing with a heat resistant adhesive is formed. It is shaped like a cylinder divided into two.

As a bayonet mechanism for fixing the outer tube 54 to the mounting base 56 of the base 55, as shown in FIGS. 3 and 4A, a convex portion 62 serving as a bayonet claw projecting and formed inside the opening 57 of the outer tube 54. Is fixed to a concave portion 63 that is a bayonet groove formed on the peripheral side surface of the support column 59 of the mounting base 56, and as shown in FIG. A method is disclosed in which a convex portion 64 serving as a bayonet claw is locked to an L-shaped notch 65 serving as a bayonet groove formed by notching the opening side of the outer tube 54 in a bowl shape from its opening end. ing.

The attachment process for attaching the outer tube 54 to the attachment base 56 of the base 55 is first performed between the opening end of the outer tube 54 and the board (flange portion) 58 of the attachment base 56 of the base 55 with which the opening end abuts. In the meantime, after applying a heat-resistant inorganic adhesive, the open end of the outer tube 54 is brought into contact with the flange portion 58 of the base 55, and the outer tube 54 is twisted (rotated) in this state. In the case of 4 (a), the convex portion 62 that is a bayonet claw formed in the outer tube 54 and the concave portion 63 that is a bayonet groove formed in the column 59 of the attachment base 56 of the base 55 are engaged with each other, In the case of FIG. 4B, a convex portion 64 serving as a bayonet claw formed on the column 59 of the mounting base 56 of the base 55, and an L-shaped notch 65 serving as a bayonet groove formed in the outer tube 54. By engaging the outer tube 54 with each other. It is fixed to the attachment base 56 of the base 55 by the yonet mechanism, and then the outer tube 54 rotates in a direction in which the bayonet claw and the bayonet groove are disengaged by vibration or the like and falls off the attachment base 56 of the base 55. In order to prevent this, the heat-resistant inorganic adhesive applied as described above is baked, and the opening end of the outer tube 54 is joined to the flange portion 58 of the base 55 with the adhesive.

However, as described above, the mounting process in which the outer tube 54 is mounted on the mounting base 56 of the base 55 with a double drop-off preventing structure using a bayonet mechanism and a heat-resistant adhesive has a processing procedure. Since it is cumbersome and time consuming, the productivity of the lamp may be significantly reduced.

In addition, the drop-off prevention structure by the bayonet mechanism requires that the bayonet pawl is screwed into the bayonet groove to be engaged with it, and the force applied to the outer tube 54 in FIG. There is a risk of damaging the formed convex portion 62 serving as a bayonet claw or damaging the L-shaped notch 65 serving as a bayonet groove formed in the outer tube 54 of FIG.

Further, the convex portion 62 formed on the outer tube 54 of FIG. 4A and the concave portion 63 formed on the support column 59 of the attachment base 56 of the base 55 are mutually connected so as to form a bayonet claw and a bayonet groove of the bayonet mechanism. It must be processed into a shape and size that can be matched, and is also formed on an L-shaped notch 65 formed on the outer tube 54 in FIG. Since the convex portion 64 has to be processed into shapes and sizes that can be engaged with each other so as to form a bayonet groove and bayonet claws of the bayonet mechanism, there is a problem that the processing is troublesome and the processing cost increases, In addition, if the machining accuracy is poor, there is a problem that the product yield of the lamp is lowered due to a problem that the bayonet claw and the bayonet groove are difficult or impossible to engage.

Moreover, the fall-off prevention structure by the heat-resistant adhesive prevents the outer tube 54 from dropping from the mounting base 56 of the base 55 by rotating in a direction in which the bayonet mechanism is disengaged due to vibration or the like. The open end of the tube 54 is joined to the flange portion 58 of the mounting base 56 of the base 55 with a heat-resistant adhesive. When the adhesive loses its adhesive force due to deterioration over time, the outer tube 54 becomes a bayonet mechanism. Therefore, there is a possibility that the base will be detached from the mounting base 56 of the base 55 by rotating in the direction in which the engagement state is released.

In addition, the adhesive placed around the support column 59 can be seen from the outside of the transparent outer tube 54, which is unpleasant and reduces the commercial value.

WO2007 / 088729

According to the present invention, the outer tube can be attached to the base of the base without depending on the adhesive force of the adhesive, and at the same time, there is no risk of damaging the outer tube, and simple processing that does not require much processing accuracy, The technical challenge is to reliably prevent the outer tube from falling off.

In order to solve the above-mentioned problems, the present invention provides an attachment base for attaching a lamp main body and an outer tube for housing the lamp main body to a base, and the attachment base has an inorganic opening end portion of the outer tube. An outer wall having a groove for supporting and fixing via an adhesive, and a lamp with an outer tube having a portion for supporting and fixing the lamp body via an inorganic adhesive, the outer wall and the opening of the outer tube Each part has a structure in which the inorganic adhesive does not fall off even if the inorganic adhesive loses adhesive strength after curing.

According to the present invention, the outer tube and the groove formed in the base each have a convex portion or a concave portion, and the gap formed between the outer peripheral surface of the outer tube and the inner peripheral surface of the outer wall of the base. The outer tube is attached to the attachment base of the base at the same time as the outer tube is attached to the attachment base by simple processing only by filling the heat-resistant adhesive or filler, and the outer tube is prevented from falling off from the attachment base.

In addition, the outer tube is attached to the attachment base of the base by a joint formed with the adhesive or filler, regardless of the adhesive force of the adhesive or filler. There is no risk of falling off the base of the base even if it is lost.

Also, since the protrusions or recesses formed on the peripheral side surface of the support column and the inner peripheral surface of the outer tube are not engaged with each other to prevent the outer tube from falling off, the process of forming the protrusions or recesses is The accuracy is not required so much, and when the outer tube is attached to the attachment base of the base, there is no possibility that the convex portion or the concave portion formed in the outer tube is damaged.

Furthermore, since the attachment portion between the outer tube and the base is hidden by the outer wall, the aesthetic appearance of the lamp is not impaired.

The figure which shows an example of the lamp | ramp with an outer tube | pipe which concerns on this invention The figure which shows the modification of the principal part of the lamp | ramp of FIG. Figure showing a conventional lamp with an outer tube The figure which shows the embodiment of the principal part of the conventional lamp | ramp with an outer tube | pipe

In the best embodiment of the lamp with an outer tube according to the present invention, a mounting base for mounting a lamp body and an outer tube for housing the lamp body is formed on a base formed of a ceramic body such as ceramic. The base has a structure in which a support column that supports and fixes the lamp body and an outer wall that surrounds the outer tube end portion are formed. The lamp body is formed of an arc tube, or an arc tube and an airtight tube that accommodates the arc tube, or a light emitting filament and an airtight tube that accommodates the arc tube, and an outer tube that accommodates the lamp body is formed of hard glass or quartz glass. Has been.

The outer tube opening is inserted into a groove formed between the support column formed on the base of the base and the outer wall, and a gap filling the heat-resistant adhesive or filler is formed between the groove and the outer tube opening. A low temperature curable paste-like heat-resistant filling the gap, with a hole penetrating the outer wall formed in a part of the outer wall and a recess formed in the opening side end of the outer tube A joint that joins the outer tube and the attachment base of the base is molded in-mold with a conductive inorganic adhesive or filler.

The outer wall is formed over the entire circumference, or has a shape in which the wall is provided only at a location necessary for bonding. Moreover, the said recessed part or convex part formed in the opening side edge part of an outer tube | pipe is formed in the substantially hemispherical dent or protrusion, or the concave groove or convex line extended in the circumferential direction of the outer tube | pipe.

FIG. 1 is a view showing an example of a lamp with an outer tube according to the present invention, and FIG. 2 is a view showing a modification of the main part. The lamp of this example is a metal halide lamp in which a lamp body 1 is composed of a ceramic arc tube 2 and a quartz glass hermetic tube 3 that accommodates it, as shown in the general view of FIG. 1 (right) . An attachment base 6 for attaching the lamp body 1 and an outer tube 5 made of hard glass or quartz glass that accommodates the lamp body is formed on the base 4.

The attachment base 6 of the base 4 has a structure in which a support 9 for supporting and fixing the lamp body 1 and an outer wall 8 surrounding the outer tube end portion are formed, and the whole is formed of a ceramic body such as ceramic. In addition, a pinch seal portion 10 of the airtight tube 3 constituting the lamp body 1 is inserted into the center portion of the column 9 along the axial direction from the tip thereof, and is fixed with a heat resistant adhesive. A deformed hole corresponding to the cross-sectional shape is formed.

As shown in FIG. 1 (left) , a groove 12 for filling a heat-resistant adhesive or filler is formed between the peripheral side surface of the support column 9 and the inner peripheral surface of the outer wall 8 facing the peripheral side surface. while being formed, the through-holes in two places provided on the outer wall 12, the open end of the outer tube 5 are formed protrusions 14 projecting from the inner circumferential surface, FIG. 1 in the groove 12 (right) The joint J that joins the outer tube 5 and the support column 9 is molded in-mold by the heat-resistant adhesive or filler S filled as described above. In addition, the protrusion part 14 of the outer tube | pipe 5 is formed in the substantially hemispherical bulge or the protruding item | line extended in the circumferential direction of the outer tube | pipe 5. As shown in FIG.

For example, the heat-resistant adhesive or filler S can be cured at a low temperature of about 100 to 300 ° C. and can withstand a high temperature of 1000 to 2000 ° C. (trade name of Asahi Chemical Industry Co., Ltd.) The low-temperature curing type paste-like inorganic adhesive or filler. As the pasty adhesive or filler S is applied to the amount by groove 12 of the mounting base 6 as shown in FIG. 1 (medium) necessary to fill the groove 12, then the outer tube 5 lamp body 1 and Cover the column 9. Thereby, the paste-like adhesive or filler S adheres to the inside and outside of the opening side end portion of the outer tube 5 and enters the through hole 13 provided in the outer wall 8. This state is shown in Fig. 1 (right) . The adhesive or filler S is in a state of being filled in the entire space inside the groove 12 including the periphery of the opening side end portion of the outer tube 5 and the through hole 13.

In this state, when the adhesive or filler S is heated and cured at a low temperature, the adhesive or filler S becomes a joint J that joins the outer tube 5 and the mounting base 6. Is attached to the attachment base 6 of the base 4. The outer tube 5 has a shape that does not fall off from the joint J by the protruding portion 14. At the same time, since the joint J enters the through hole 13, the joint J has a shape that does not fall off the mounting base 5. For this reason, the outer tube 5 is prevented from falling off the mounting base 6.

As described above, the outer tube 5 is not bonded to the column 9 by the adhesive force of the adhesive or filler S, but is bonded to the column 9 by the joint J in-molded with the adhesive or filler S. Therefore, even if the adhesive or filler S loses its adhesive force due to deterioration over time, there is no possibility that the outer tube 5 will drop off from the mounting base 6 of the base 4, and the adhesive or filler S has no adhesive effect. Even if the filler does not perform, it is possible to reliably prevent the outer tube 5 from falling off, and the product quality and reliability of the lamp are remarkably improved.

Further, the outer tube 5 is not attached to the attachment base 6 of the base 4 by directly engaging the protruding portion 14 formed on the inner peripheral surface thereof with the peripheral side surface of the support column 9 but is filled with an adhesive or a filler S. Therefore, there is no possibility that the projecting portion 14 of the outer tube 5 is damaged during the attachment.

Further, it is sufficient that the protruding portion 14 of the outer tube 5 and the through hole 13 of the outer wall 8 have such a size that the joint J for joining the outer tube 5 and the mounting base 6 can be formed in-mold. Since a high dimensional accuracy is not required, the process of forming the protrusion 14 and the through hole 13 is relatively easy and the processing defect rate is low. Further, an adhesive or filler S is filled between the opening 12 of the outer tube 5 in which the protruding portion 14 and the through hole 13 are formed and the groove 12, and the adhesive or filler S is cured. The joint J that joins the outer tube 5 and the mounting base 6 is in-molded by simple processing only, and the outer tube 5 is attached to the mounting base 6 of the base 4, and at the same time, the outer tube from the mounting base 6. 5 is reliably prevented from falling off, so that the mounting cost of the outer tube 5 is not increased, and the productivity of the lamp does not decrease.

The lamp of FIG. 1 has a protruding portion 14 formed at the opening side end portion of the outer tube 5 and a through hole 13 provided in the outer wall 8, but the configuration shown in FIG. That is, as shown in FIG. 2 (left), the groove 12 having a portion wider than the groove width of the groove opening end 15 is formed in the mounting base 6, and the protrusion 16 is formed at the opening end of the outer tube 5. 2, a through hole 17 is formed in the outer wall 8 as shown in FIG. 2 (middle) , and a recess 18 is formed near the end of the outer tube 5, or a through hole is formed in the outer wall 8 as shown in FIG. 2 (right) . 19 may be formed, and a convex portion 20 may be formed near the end of the outer tube 5.

The through holes 13, 17, and 19 are components for preventing the joint J formed in the groove 12 from dropping from the groove 12. In addition to the through hole, the same purpose can be achieved by processing the shape of the protrusion, recess, and protrusion on the inner peripheral surface of the outer wall 8 or the outer peripheral surface of the support column 9 constituting the groove 12.

Further, the protrusion 16 of the outer tube 5 shown in FIG. 2 (left) is a substantially hemispherical protrusion formed by heating and softening a part of the end of the outer tube 5 or a ridge extending in the circumferential direction of the outer tube 5. 2 and the recesses 18 and 20 of the outer tube 5 shown in (middle) and (right) of FIG. 2 are substantially hemispherical recesses or outer tubes 5 formed by heating and softening a part near the end of the outer tube 5. A convex portion 20 of the outer tube 5 shown in FIG. 2 (right) is a substantially hemispherical convex portion or outer tube formed by heating and softening a part near the end of the outer tube 5. 5 is formed with ridges extending in the circumferential direction. In FIG. 2 (left) , when the height of the column or outer wall constituting the groove 12 is lower than the other, the lower end surface position is the groove opening end position.

In addition, although the outer tube | pipe 5 of an Example is a cylindrical type, the outer tube | pipe of this invention is not limited to a cylindrical outer tube | pipe. Further, the outer tube of the present invention includes what is called an outer sphere, an outer sphere valve, or an outer valve.

The present invention simplifies the process of attaching the outer tube of the lamp with the outer tube to the mounting base of the base, and at the same time, reliably prevents the outer tube attached to the mounting base of the base from falling off.・ Contributes to improvement of reliability.

1: Lamp body 2: Arc tube 3: Airtight tube 4: Base 5: Outer tube 6: Mounting base 7: Outer tube opening 8: Outer wall 9: Post 10: Pinch seal portion 12 of the airtight tube 12: Groove 13: Through Hole 14: Projection 15: Groove opening end 16: Concave 17: Through hole 18: Concave 19: Through hole 20: Convex S: Adhesive or filler J: Joint

that's all

Claims (3)

An attachment base formed of a porcelain body for attaching a lamp body and an outer tube that accommodates the lamp body is formed on the base, and the opening end of the outer tube is connected to the attachment base via an adhesive or a filler. wherein an outer wall having a groove for supporting and fixing the lamp body at lamp with an outer bulb which has a structure in which a portion supporting and fixing through the inorganic adhesive is formed, a part of the mounting base constituting said groove Te The adhesive or filler filled between the opening of the outer tube is formed as a joint that prevents the outer tube from falling off the base even if the adhesive force is lost after curing. Lamp with outer tube to do. The lamp with an outer tube according to claim 1, wherein at least one through hole having a size capable of forming a joint for joining the outer tube and the attachment base to the outer wall of the attachment base is formed. The lamp with an outer tube according to claim 1, wherein the groove portion is formed over the entire circumference of the mounting base, and the groove portion has a portion that is wider than the groove width at the opening end of the groove portion.

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