JP2003045218A - Bulb with reflecting mirror and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulb with a reflecting mirror in which the base supporting the arc tube and the reflecting mirror can be firmly fixed and positioned precisely, and assembled simply, and its manufacturing method. SOLUTION: The sealing part 1b of the arc tube 1 and the base 2 are fixed. A reflecting mirror 3 made of aluminum and of a funnel shape is fixed to the base 2. The reflecting mirror 3 comprises a reflecting part 3a that is finished in mirror face on the inner face and a barrel part 3b. Grooves 2c, 2d are formed at three points at an equal distance on the outer surface of the base 2 so as to cross at right angles respectively in the longitudinal direction and circumference direction of the base 2. The groove 2d is formed at the nearly center of the outer circumference of the base 2 in belt form. The reflecting mirror 3 and the base 2 are fixed by caulking the prescribed portions of the barrel part 3b of the reflecting mirror 3 to the grooves 2c, 2d of the base 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube with a reflecting mirror and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional tube with a reflecting mirror comprises an arc tube such as a halogen lamp or a discharge lamp and a glass reflecting mirror having a paraboloidal mirror surface. It is known that the light is reflected and radiated forward. In such a lamp with a reflecting mirror, after the arc tube is positioned inside the reflecting mirror, the arc tube and the reflecting mirror are fixed by cement or the like, and the reflecting mirror is fixed to the base by an adhesive. (JP-A-5-21043).

[0003]

However, in such a conventional bulb with a reflecting mirror, the reflecting mirror and the base are fixed by thermal expansion of the arc tube due to repeated lighting and extinguishing of the lamp depending on the situation of use. There is a risk that the existing adhesive such as cement will deteriorate and eventually the reflecting mirror will fall. In addition, since it is fixed with an adhesive such as cement, the reflecting mirror may fall off when a strong vibration impact is applied. Further, in the manufacturing process, since it is necessary to accurately irradiate the light forward, the alignment work for accurately aligning the light center of the arc tube and the focal point of the reflector, and the subsequent arc tube and reflector The lamp assembling process is complicated and costly, because the work of aligning the lamp with the base is required, and further, the work of injecting the cement is complicated and the position shifts until the cement hardens. .
Further, with the downsizing of the arc tube, higher accuracy is required for the alignment between the arc tube and the reflecting mirror, and it takes time to make adjustment to satisfy this accuracy.

According to the present invention, the base for holding the arc tube and the reflecting mirror can be firmly fixed to each other and has a structure that is resistant to deterioration over time and vibration and shock, and the positioning of the arc tube and the reflecting mirror can be performed with high accuracy. An object of the present invention is to provide a bulb with a reflecting mirror that can be assembled and can be easily assembled, and a method for manufacturing the same.

[0005]

SUMMARY OF THE INVENTION A tube with a reflecting mirror according to the present invention comprises an arc tube, a base for holding the arc tube, light fixed to the base and emitted from the arc tube. A reflecting mirror made of metal for irradiating the base, a groove is provided in the base, and the reflecting mirror is fixed to the groove by caulking.

With this, the base for holding the arc tube and the reflecting mirror can be firmly fixed, and the position of the arc tube and the reflecting mirror can be accurately adjusted, and the assembly can be performed easily.

Further, in the method of manufacturing a bulb with a reflecting mirror according to the present invention, the arc tube, the base for holding the arc tube, the light fixed from the base and emitted from the arc tube are forwarded. It is composed of a reflecting mirror made of metal for irradiating, the groove is provided in the base, and the reflecting mirror is a method for manufacturing a tube with a reflecting mirror fixed by being caulked in the groove, wherein the base is , Is inserted into a holder having a stopper for adjusting the punching position therein, and the end of the die is brought into contact with the stopper in the holder, and then the groove is punched.

With this, the punch can be easily positioned at the planned caulking position, so that the punching work thereafter can be performed easily and accurately.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a bulb with a reflecting mirror for a portable electric lamp according to an embodiment of the present invention is an arc tube 1.
As a light emitting portion 1a having a pair of electrodes (not shown) inside and containing mercury and iodide, the light emitting portion 1a
A one-end sealed 21W metal halide lamp having a sealing portion 1b in which a metal foil (not shown) connected to an electrode is sealed at the end of a is used. The sealing portion 1b
From, two external lead wires 1c are led out.

The arc tube 1 has a diameter of 12.8 mm and a length of 16
It is held by a cylindrical base 2 made of ceramic of mm. Depth 2mm for attaching arc tube 1 to base 2
2a, and two through holes 2b are provided in the hollow 2a. The two external lead wires 1c of the arc tube 1 are inserted into the through holes 2b, and the sealing portion 1b is formed in the hollow 2a.
After being positioned inside, cement is poured into the recess 2a to fix the sealing portion 1b of the arc tube 1 and the base 2.

A funnel-shaped reflecting mirror 3 made of aluminum for irradiating the light emitted from the arc tube 1 to the front is fixed to the base 2. The reflecting mirror 3 has a reflecting portion 3a with an inner diameter of 65 mm and an opening diameter of 65 mm, and a body portion 3b with a thickness of 0.7 mm and an inner diameter of 13 mm to which the base 3 is fixed. Grooves 2c and 2d are provided on the outer surface of the base 2 at positions where the reflecting mirror 3 should be attached so as to be orthogonal to the longitudinal direction and the circumferential direction of the base 2, respectively. As shown in FIG. 2, the grooves 2c are formed on the outer peripheral surface of the base 2 on the side of the arc tube 1 at four positions with a length of 4 mm and a depth of 1 mm in the longitudinal direction of the base 2 at equal intervals. The groove 2d is formed in a strip shape on the outer peripheral surface of the base of the base 2. And the reflector 3
The reflecting mirror 3 and the base 2 are fixed by caulking predetermined portions of the body portion 3b of the base 2 into the grooves 2c and 2d of the base 2.

The arc tube 1 is preferably a one-end sealed type in view of vibration resistance and strength against external impact, but a double-ended type may be used. In order to fix the arc tube 1 and the base 2 to each other, it is desirable to fix the external lead wire 1c having the lowest temperature to the base 2 with a small amount of cement because cement deterioration due to thermal expansion is reduced.

It is desirable that the number of crimps is an odd number, and it is preferable that they are formed on the outer peripheral surface of the die 2 at equal intervals. In this case, by simultaneously punching the caulking points, the stresses due to the caulking act in the directions canceling each other out, and the caulking can be fixed at the correct position.

Further, the base 2 may be provided with a groove only at one place, and the body portion 3b of the reflecting mirror 3 may be caulked in the groove.
In order to firmly and accurately fix the base 2 to which the arc tube 1 is fixed, it is preferable to caulk at two or more places.
As described above, the base 2 and the reflecting mirror 3 can be more accurately and firmly fixed by forming the grooves at the three positions at equal intervals on the outer peripheral surface and caulking them. Further, only a band-shaped groove extending in the circumferential direction of the die or a groove extending in the longitudinal direction of the die may be used, or these grooves may be used in combination. The depths of the grooves 2c and 2d are such that the body portion 3a of the reflecting mirror 3 during caulking.
It is desirable that the thickness of the reflecting mirror 2 be about the same in order to minimize the deformation. The caulking shape may be a general conical shape (needle punching), or may be a wedge shape matching the shape of the groove of the die 2. This is because the contact area is increased as compared with the conical shape, so that the base 2 can be fixed more reliably. The material of the reflector is
Although aluminum is used as a lightweight metal in consideration of workability and portability, a metal such as iron or stainless steel may be used.

Next, a method of manufacturing a tube with a reflecting mirror according to the present invention will be described with reference to the drawings.

As shown in FIG. 2, a holder 4 for fixing the base 2 is provided with a guide projection 4a for positioning, and is fitted with a guide recess (not shown) formed in the base 2. It Then, the reflecting mirror 3 is covered on the base 2 to turn on the arc tube 1. After lighting, the caulking and fixing is performed at a predetermined position while moving the reflecting mirror 3 back and forth (or moving up and down) in the axial direction of the base while looking at the irradiation figure projected on the screen installed in front of the reflecting mirror 3.

A stopper (not shown) for regulating the punching position is provided at the bottom of the holder 4 to regulate the position of the punching position of the mouthpiece 2. Punch 5 for caulking
It suffices to use only the number of places where crimping is performed, but as shown in FIG. 2, a plurality of protrusions 5 a are provided at the tip of the punch 5.
Alternatively, one punch 5 may be used to perform caulking at a plurality of locations. Further, the punch 5 is fixed in position with reference to the stopper of the holder 4, and by inserting the end of the mouthpiece 2 until it comes into contact with the stopper in the holder 4, the caulking position of the mouthpiece 2, that is, the position of the groove. The punch 5 can be positioned at the position, and then the punching can be performed simultaneously by the three punches 5 and the caulking and fixing can be accurately performed at the planned caulking position.

A transparent front plate 6 is attached to the front opening of the reflecting mirror 3. As shown in FIG. 3, a holding piece 3c for holding the front plate 6 in advance is integrally molded at the peripheral portion of the front opening of the reflecting mirror 3, and the front plate 6 is inserted into the front opening of the reflecting mirror 3. After mounting, the front end portion of the holding piece 3c is bent by a squeezing roller (not shown) so as to hold the peripheral edge portion of the front surface plate 6 so that the front surface plate 6 is fixed to the front opening of the reflecting mirror 3. Can be provided. In the conventional tube with a reflecting mirror, the reflecting mirror and the front plate are fixed by using another member such as a tightening frame or a metal ring, but as described above, the sandwiching piece 3c is reflected in advance. If it is molded integrally with the mirror, it is not necessary to use a separate member such as a tightening frame or a metal ring, so the number of parts can be reduced compared to the conventional one, and the airtightness required for outdoor use is met. I can respond. Furthermore, the reflector 3 and the front plate 6
By sandwiching a packing (not shown) between and, airtightness is further enhanced and waterproofness is also improved.

The reflecting mirror 3 shown in FIG. 3 is formed by placing a metal block of aluminum on a mold of the reflecting mirror to be obtained and pressing it. After that, evaporate aluminum,
A reflecting surface is formed on the reflecting portion 3a. Here, aluminum was vapor-deposited in consideration of reflectance, durability at high temperature, and familiarity with the base material, but a mirror surface may be finished by chrome plating or the like. At the time of press working, as shown in FIG. 3, the sandwiching piece 3c is continuously provided on the reflecting portion 3a and integrally molded into a substantially L-shape. Thereby, the front plate 6 can be easily placed and aligned on the substantially L-shaped sandwiching piece 3c, and further, when the sandwiching piece 3c for sandwiching the front plate 6 is bent, it is formed into a linear shape. Unlike the one including the sandwiching piece, it is possible to prevent stress from being applied to the reflecting surface of the reflecting portion 3a and the deformation of the reflecting surface.

With such a configuration, in the tube with a reflecting mirror and the method for manufacturing the same of the present embodiment, unlike the conventional case, cement is not used for fixing the base to the reflecting mirror.
The reflecting mirror does not drop due to the deterioration of cement that has occurred in the past, and since the reflecting mirror is firmly fixed to the base by caulking, the reflecting mirror can fall off from the base even if strong vibration or shock is applied. In addition, since the light center of the arc tube and the focus of the reflecting mirror can be adjusted by moving the reflecting mirror back and forth (or up and down), unlike the conventional cement fixing method, It is not necessary to adjust the complex optical center of the arc tube and the focal point of the reflecting mirror by combining the movements, and the assembly can be easily performed.

[0022]

As described above, the bulb with a reflecting mirror of the present invention can firmly fix the base for holding the arc tube and the reflecting mirror, and has a structure resistant to deterioration over time and vibration and shock. The position of the arc tube and the reflecting mirror can be accurately adjusted, and the assembly can be easily performed.

Further, in the method of manufacturing a tube with a reflecting mirror according to the present invention, the punch can be easily positioned at the planned caulking position, so that the subsequent punching work can be performed easily and accurately.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a tube with a reflecting mirror according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a tube with a reflecting mirror.

FIG. 3 is a sectional front view of the same reflecting mirror.

[Explanation of symbols]

1 arc tube 1a light emitting part 1b Sealing part 1c External lead wire 2 clasp 2a hollow 2b through hole 2c, 2d groove 3 reflector 3a Reflector 3b body 3c clamping piece 4 holder 4a Guide projection 5 punches

Claims (5)

[Claims] 1. A base comprising: an arc tube, a base for holding the arc tube, and a metallic reflecting mirror fixed to the base and irradiating light emitted from the arc tube forward. A tube with a reflecting mirror, wherein the reflecting mirror is provided with a groove, and the reflecting mirror is fixed to the groove by caulking. 2. The bulb with a reflecting mirror according to claim 1, wherein a plurality of the grooves are formed on the outer peripheral surface of the die at equal intervals. 3. The reflection according to claim 1 or 2, wherein the groove comprises at least one kind of groove extending in a longitudinal direction of the die and a groove extending in a circumferential direction of the die. Lamp with a mirror. 4. An arc tube, a cap for holding the arc tube, and a metallic reflecting mirror that is fixed to the cap and irradiates light emitted from the arc tube forward. A method for manufacturing a tube with a reflecting mirror in which a groove is provided in the reflecting mirror, the reflecting mirror being caulked and fixed in the groove, wherein the base is inside a holder having a stopper for regulating a punching position. The method of manufacturing a tube with a reflecting mirror, comprising: inserting into a holder, bringing the end of the base into contact with the stopper in the holder, and then punching into the groove. 5. The reflecting mirror according to claim 4, wherein when the caulking groove is provided at a plurality of positions on the outer peripheral surface of the die, the punching is simultaneously performed on the grooves at a plurality of positions. Tube manufacturing method.