JP2515396Y2 - Light source - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a light source device having a short arc type discharge lamp.

[Conventional technology]

When a short arc type discharge lamp formed so that one and the other sealing tube portions extend on both sides of the central light emitting space bulging portion is combined with a concave reflecting mirror to form a light source device, it is usually arranged on the reflecting mirror side. The lead wire extending from the other sealing tube portion crosses the front opening of the concave reflecting mirror and is connected to a fixed terminal of a power supply line arranged so as to extend to the back surface of the concave reflecting mirror.

[Problems to be solved by the device]

The above-described conventional light source device has a problem that the structure is complicated because a fixed terminal is required, and the assembly is troublesome and the device is large.

If the lead wire on the concave reflector side is extended and fixed to the neck opening side, there is a limit to how large the neck opening may be in relation to the light utilization rate. There is a problem in terms of insulation to withstand high voltage application when the discharge lamp is lit.

The present invention has been made in view of the above problems, and an object thereof is to provide a light source device having a simple structure, a high light utilization rate, and good insulation resistance. .

[Constitution of device]

The light source device of the present invention comprises a short arc type discharge lamp in which one and the other sealing tube portions extend on both sides of the central light emitting space bulging portion, and a groove portion along the longitudinal direction of the outer surface of the cylindrical ceramic. Has a base formed therein, a cylindrical neck portion extending outward from an opening formed in the top portion, and a first taper portion extending largely diverging from the top opening on the inner surface of the neck portion, 1 taper part, followed by a concave reflecting mirror formed with a second taper part which expands and extends a little, and one of the sealing tube parts is inserted into the base and fixed with an adhesive,
A lead wire extending from the other sealing tube portion is extended to one sealing tube portion side and disposed along the groove portion, and the adhesive leakage prevention washer fitted to the base is brought into contact with the first taper portion of the neck portion. The adhesive is filled from the outer end side of the neck portion and dried to fix the base and the concave reflecting mirror.

[Action]

Since the lead wire extending from the other sealing tube is arranged in the groove formed along the outer surface of the base, the base to be inserted into the neck of the concave reflecting mirror can be designed small and it is necessary to increase the opening of the neck. Absent. The inner surface of the neck is provided with a first taper portion that expands to a larger extent than the top opening and a second taper portion that expands to a smaller extent and continues following the first taper portion to prevent leakage of the adhesive fitted to the base. Since the stop washer is brought into contact with the first taper portion and the adhesive is filled from the outer end side of the neck portion, the filling of the adhesive is easy, and the lead wires are not connected by the adhesive. Insulation can be sufficiently secured.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention. The short arc type discharge lamp 1 is a 150 W metal halide lamp, and a light emitting space bulging portion 12 is formed at the center of a bulb 11. The light emitting space bulging portion is formed. One and the other sealing tube portions 13 and 14 are formed on both sides of 12. A pair of electrodes 2 are arranged to face each other in the central light emitting space bulging portion 12.
Are connected to a metal foil 21 embedded in the sealing tube portions 13 and 14, respectively, and one and the other external leads 23 and 24 are connected to the metal foil 21, respectively, and extend outward.
Then, the coated lead wire 25 is directly connected to the one outer lead 23, and the other outer lead 24 is connected to the coated lead wire 27 via the connection wire 26 extending toward the one sealing tube portion 13. There is.

A ceramic base 3 is attached to one of the sealing tube portions 13. The base 3 has a crescent-shaped hole 31 through which the one sealing tube portion 13 is inserted, as shown in the sectional view of FIG. And a groove portion 32 extending along the longitudinal direction of the outer side surface, in a state where the sealing tube portion 13 is inserted so that the connection portion 28 between the external lead 23 and the coated lead wire 25 fits in the hole 31, An adhesive 33 is filled and fixed in the hole 31. The connecting wire 26 is connected to the external lead 24 extending outward from the other sealing tube portion 14.
, The sealing lead portion 14 and the light emitting space bulging portion 12 are extended downward, and the covering lead wire 27 introduced from below is connected to the groove portion formed in the ceramic base 13. In addition, when the 150 W short arc type metal halide lamp of this embodiment is turned on, a high voltage of 10 to 15 KV is applied.

The concave reflecting mirror 4 has an opening 41 at the top thereof.
A neck portion 42 extending outward is formed on 41. The inner surface of the neck portion 42 has a first taper portion 43 that widens and expands as it extends outward from the opening 41, and a second taper portion 44 that expands and extends smaller than the first taper portion 43.
The short arc type discharge lamp 1 to which the base 3 is attached is inserted into this neck portion 42, and the ceramic-made adhesive leakage washer 5 is fitted from the outer end side of the base 3, It abuts on the first tapered portion 43 at a position on the inner end side of the base 3. Then, the adhesive 6 is filled from the outer end 45 side of the neck portion 42 and dried for a predetermined time to fix the base and the concave mirror. The adhesive leakage prevention washer 5 may be formed in the shape of a single ring, or two cutouts of one may be used.

FIG. 3 is a sectional view of an essential part of another embodiment of the present invention,
This is an example in which a cylindrical portion 34 having a small diameter is provided on the outer end side of the base 3.
When the small-diameter portion 34 is provided in this manner, the periphery of the connecting portion 28 is narrowed, the adhesive 33 is less likely to leak, and it can be effectively used as a chucking portion when positioning the short arc discharge lamp 1. it can. The other numbers in FIG. 3 are the same as those in FIGS. 1 and 2, and therefore the description thereof is omitted here.

[Effect of device]

As described above, the light source device of the present invention has the following four effects.

(A) When a short arc type discharge lamp is lit, a high voltage is applied between the two lead wires, but a connecting portion between the lead wire and the covered lead wire extending from one sealing tube portion arranged in the base. Since a sufficient insulation distance is provided between the lead wire and the lead wire extending from the other sealing tube portion, it is possible to withstand a high voltage and not cause a short circuit.

(B) Since the covered lead wire is arranged in the groove formed along the outer surface of the base, the base becomes compact.

(C) Since the first taper portion and the second taper portion are expanded and extend to the outer end side, the opening of the neck portion is also small, and the light utilization efficiency is improved.

(D) Since the adhesive leakage washer is provided, the adhesive does not leak from the opening side of the base.

[Brief description of drawings]

FIG. 1 is a sectional view of a light source device according to an embodiment of the present invention, FIG. 2 is a sectional view of a base, and FIG. 3 is a sectional view of an essential part of another embodiment. DESCRIPTION OF SYMBOLS 1 ... Short arc type discharge lamp, 11 ... Bulb 12 ... Luminous space bulging part, 13, 14 ... Sealing tube part 2 ... Electrode, 21 ... Metal foil 23, 24 ... External lead, 25, 27 ... Coated lead wire 26 ... Connecting wire, 28,29 ... Connecting portion 3 ... Base, 32 ... Groove portion 4 ... Concave reflecting mirror, 42 ... Neck portion 43 ... First taper portion, 44 ... Second taper portion 5 ... Adhesive leakage preventing washer 33,6 ... adhesive

Claims (1)

(57) [Scope of utility model registration request] 1. A short arc type discharge lamp in which one and the other sealing tube portions extend on both sides of a central light emitting space bulging portion, and a groove portion is formed along the longitudinal direction of the outer surface of a cylindrical ceramic. A base and a first neck portion having a tubular neck portion that extends outward from an opening formed in the top portion, the first taper portion that greatly extends from the top opening and extends on the inner surface of the neck portion, and the first taper portion. The concave reflecting mirror is formed with a second taper portion which is expanded to a small extent and extends. One of the sealing tube portions is inserted into the base and fixed with an adhesive, and extends from the other sealing tube portion. The lead wire is extended to one sealing tube side and is arranged along the groove part, and the adhesive leakage washer fitted to the base is brought into contact with the first taper part of the neck part to apply the adhesive to the outer end side of the neck part. It was filled from above and dried to fix the base and concave mirror. Light source device according to symptoms.