JPH0128582Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a discharge lamp cooling device, and in particular, a cooling device for a discharge lamp (for example, a xenon lamp) that has a cap for connection with an external circuit at both ends. It is related to.

(Prior Art) FIG. 2 is a partially cutaway exploded perspective view showing an outline of an illuminator to which this type of discharge lamp is applied.

In FIG. 2, 1 is a discharge lamp such as a xenon lamp, and 2 is a rotating quadratic curved surface reflector (hereinafter abbreviated as a reflector) having a hole 3 in the center of the top for inserting the discharge lamp 1. Reference numeral 4 denotes a support fitting to which the discharge lamp 1 is attached, and this support fitting 4 is connected to an X, Y, and Z axis position adjustment mechanism (not shown). Note that the longitudinal cross-sectional shape of the reflecting mirror 2 may be an elliptical curved surface, a parabolic curved surface, or any other curved surface.

The discharge lamp 1 includes a transparent glass body 5 with a swollen middle portion, bases 6a and 6b for connecting to an external circuit provided at both ends of the case, and housing and arrangement inside the case 5, and one end of the body 5. The above connection cap 6a,
6b, and the other end is attached to the swollen part 5a of the main body 5.
Electrode rods 8a facing each other with a gap 7 in between,
8b. Terminal mounting threaded rods 9a,
9b is provided.

The support fitting 4 has a conductive plate 4a at its end.
For example, the terminal attaching threaded rod 9 is attached to the tip of the conductive plate 4a by welding, connecting, etc.
A notch 10 is formed through which b is passed. However, the conductive plate 4a does not necessarily need to be attached; in this case, a notch or a threaded rod insertion hole may be formed in the support fitting 4.

One end of the discharge lamp 1 is passed through the hole 3 of the reflector 2, and the terminal attachment threaded rod 9b at the end is passed through the notch 10 of the support fitting 4, and then tightened and fixed with a nut 12. Then, a terminal 14 provided at the tip of the flexible cable 13 is fitted onto the front terminal mounting threaded rod 9a and fixed with a nut 11.

Further, a terminal 16 provided at the tip of the flexible cable 15 is attached to the conductive plate 4a with a screw 17. This terminal 16 is connected to the support fitting 4 of the discharge lamp 1.
When attaching to the terminal, it may be attached directly to the terminal attaching threaded rod 9b.

Note that the reflecting mirror is mounted and supported in the illustrated state by another supporting metal fitting (not shown).

In the illuminator having the above configuration, a flexible cable 1 is connected to the connection bases 6a and 6b at both ends of the discharge lamp 1.
3 and 15, the discharge lamp 1 lights up. Due to this lighting, the temperature of the connection caps 6a, 6b and their vicinity becomes particularly high, and there is a risk of accidents such as stem cracks and explosions.

Therefore, conventionally, as shown in FIG. 3, cooling air is sent into the reflector 2 through the hole 3 by a blower fan 18 disposed on the side of the support metal fitting 4, and the discharge lamp 1 is
And the reflecting mirror 2 is cooled.

(Problem to be solved by the invention) However, as shown by arrow a, part of the cooling airflow flows along the outer surface of the reflector 2 and is wasted, and the cooling airflow that passes through the holes 3 is also lost. It is disturbed within the reflecting mirror 2, and a part of it flows along the inner surface of the reflecting mirror as shown by arrow b. For this reason, the cooling of the connection mouthpiece 9b on the side of the blower fan 18 was not sufficient, and the cooling of the connection mouthpiece 9a on the opposite side was hardly performed, resulting in a problem of extremely poor cooling efficiency as a whole.

The present invention has been made in order to eliminate the above-mentioned problems, and its purpose is to provide a cooling device that can efficiently cool the connection bases at both ends of the discharge lamp.

(Means and effects for solving the problem) In order to achieve the above object, the present invention covers the discharge lamp with a transparent cylindrical cover over almost its entire length, and covers the discharge lamp with a cylindrical cover from one end of the discharge lamp. The feature is that the cooling air flow sent into the cover is transferred to the other end side without wastage, and the cooling effect is efficiently performed.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, in which the same parts as in FIGS. 2 and 3 are designated by the same reference numerals.

In Fig. 1, reference numeral 19 denotes a cylindrical cover that covers almost the entire length of the discharge lamp 1. The end on the flow discharge side is bent inward to reduce its diameter.

Next, the cooling operation of the discharge lamp 1 will be explained.
A blower fan 18 is attached to the cylindrical cover 19 from one end thereof.
The cooling air flow sent in flows inside the cylindrical cover 19 from the feeding side toward the discharge end side, and efficiently cools the entire rod-shaped lamp 1. Further, in this case, the cooling air flow is particularly narrowed at the bent portion 19a at the discharge side end of the cylindrical cover 19 and strongly hits the connection cap 9a, thereby enhancing the cooling effect.

In addition, as mentioned above, the cooling air discharge end of the cylindrical cover 19 may not be constricted and the entire structure may be formed into a tubular shape, or the cooling air supply end may be enlarged into a funnel shape, and The tube diameter may be configured to gradually decrease from the feeding side end toward the discharge side.

(Effects of the invention) As described above, according to this invention, a light-transmitting and heat-resistant cylindrical cover is provided that covers almost the entire length of the discharge lamp, and the cylindrical cover is placed inside the cylindrical cover. Since the rod-shaped lamp is cooled by blowing a cooling air stream from one end side, all of the cooling air stream is used for cooling without wastage, and the entire discharge lamp can be efficiently cooled.

Furthermore, when the diameter of the cooling airflow discharge end side of the cylindrical cover is reduced, the cooling airflow is constricted and the cooling effect of the end of the discharge lamp remote from the cooling fan can be enhanced.

Therefore, the effect of reducing the causes of accidents such as stem cracks and explosions caused by the connection caps at both ends of the discharge lamp becoming hot can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway exploded perspective view showing a part of the outline of an illuminator using a discharge lamp, Fig. 2 is a vertical cross-sectional view of an illuminator using a conventional cooling device, and Fig. 3 is a schematic diagram of an illuminator using a conventional cooling device. FIG. 2 is a longitudinal cross-sectional view of an illuminator to which a cooling device is applied. DESCRIPTION OF SYMBOLS 1... Discharge lamp, 2... Reflector, 3... Hole, 4... Support metal fittings, 6a, 6b... Connection cap, 18... Ventilation fan, 19... Cylindrical cover, 19a... Bent part.

Claims (1)

[Claims for Utility Model Registration] (1) A discharge lamp having connection caps at both ends, a rotating quadratic curved surface reflector having an insertion hole for the discharge lamp in the center of the top, and a rotating quadratic curved surface reflector having the discharge lamp extending over almost its entire length. It is characterized by comprising: a translucent and heat-resistant cylindrical cover that extends over the insertion hole; and a blower fan that is disposed opposite to the end surface of the cylindrical cover protruding from the insertion hole and blows cooling air into the cylindrical cover. Discharge lamp cooling device. (2) The discharge lamp cooling device according to claim (1) of the utility model registration, characterized in that the airflow discharge side end of the cylindrical cover is bent inward to reduce its diameter.