JP2000228109A - Lamp housing for bent-tube discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent thermal energy from returning to a bent-tube discharge lamp again and reheating it, and thereby extend the service life of the bent-tube discharge lamp by emitting forward the radiant light from the side face direction to the back face direction of the bent-tube discharge lamp received in a lamp receiving part. SOLUTION: Ultraviolet light rays A-F emitted from the peripheral part of a bent-tube discharge lamp M toward the back face of the bent-tube discharge lamp M on its concave part side are scattered at the concave part of an concave mirror, irradiates an exposed body irradiation surface 8 through a face plate 6 and a correction filter 5 in front of it and enhances the intensity of the ultraviolet rays irradiating the exposed body irradiation surface 8. Additionally, a radiant ultraviolet ray G toward the back face of the bent-tube discharge lamp M irradiates a flat part 1 m, is scattered obliquely forward, so that its ill effect such that it is reflected again to the bent-tube discharge lamp M and reheats the bent-tube discharge lamp M is eliminated. That is, an ill effect that shortens the service life of the bent-tube discharge lamp M by reheating the bent-tube discharge lamp M as thermal energy can be eliminated, and the service life can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curved tube discharge lamp lamp house suitable for use in a curved tube discharge lamp such as an ultra-high pressure mercury lamp.

[0002]

2. Description of the Related Art An ordinary discharge tube, for example, an ultra-high pressure mercury lamp which is of a straight tube type and performs arc discharge using the principle of a capillary tube, has a lighting pressure of 2 × 10 ⁷ pa and an electrode temperature of 1600 during discharge. In order to reach from 1 to 1700 ° C, cooling is performed through a water-cooled jacket.

The present inventor has developed an inverted U-shaped ultra-high pressure mercury lamp obtained by improving these straight tube type ultra-high pressure mercury lamps in Japanese Patent Publication No. 6-3024.
No. 0 proposes this.

FIG. 5 shows an ultra-high pressure mercury lamp disclosed in the above-mentioned publication. The structure of the ultra-high pressure mercury lamp M will be briefly described. A tube body 21 made of a quartz tube or the like is provided, and rod-like discharge electrodes 23L and 23R made of, for example, a tungsten wire are disposed at both ends of the tube body 21 on both ends of the tube body so as to penetrate therethrough. Sealed.

At both ends of the tubular body 21, narrowed portions 24 L and 24 R are annularly protruded from the respective ends of the tubular body 21 at positions maintaining a required distance from each end, and the narrowed portions 24 L and 24 R are connected to each other. Mercury reservoirs 25L and 25R filled with mercury 26L and 26R are formed between the sealing portions at each end of the tube 21. Each electrode 2
3L and 23R have inner ends protruding from the mercury 26L and 26R, and the leads composed of the outer ends of the electrodes 23L and 23R or the leads 27L and 27R connected to the outer ends are connected to the tube 21. Led out.

[0006] At both ends of the ultra-high pressure mercury lamp M, bases 28 made of metal or synthetic resin are provided for electrical connection with other parts and mechanical reinforcement. Through holes 29L and 29R into which both ends of the tube body 21 are inserted are formed in the base 28, and the two electrodes 2 are inserted through the through holes 29L and 29R.
3L and 23R leads 27L and 27R are base 28
For example, from the lower end. Also, the through holes 29L and 2L
9R is filled with an adhesive 30, for example, an insulating adhesive when the base 28 is conductive, so that the tube 28 is mechanically held on the base 28.

According to the above configuration, since the discharge space 22 is physically disposed above the mercury reservoirs 25L and 25R at both ends, the liquefied mercury 2
6L and 26R return to the mercury reservoirs 25L and 25R promptly due to their own weight as well as the surface tension.
It is possible to drastically reduce the incorporation of the rare gas, thereby effectively reducing the generation of air bubbles.
Since the terminals of the two electrodes can be led out of the tube, connection to an external circuit is simplified, and the tube 28
By mechanically integrating the two ends of the tube 1, a reinforcing effect is produced, and the number of breakage accidents of the tube 21 is drastically reduced. In addition, the overall size and size can be reduced. Further, there is an advantage that the light distribution can be easily obtained as compared with the case where the ultra-high pressure mercury lamp is linear.

[0008] Using the above-mentioned inverted U-shaped ultra-high pressure mercury lamp (hereinafter referred to as a curved tube discharge lamp), exposure of a phosphor of a cathode ray tube, a shadow mask, printing plate making, a printed circuit board, an IC lead frame or the like is performed. When used as a printing light source, a curved tube discharge lamp storage device is used as shown in FIGS. Such a curved tube discharge lamp accommodating device has been previously proposed by the present applicant as Japanese Patent Application Laid-Open No. 1-14572.

FIGS. 6 and 7 are a plan view and a sectional view taken along the line VI-VI of FIG.

In FIG. 6 and FIG. 7, reference numeral 31 denotes a lamp house base, which is positioned at a base by fitting pin holes 31a at four corners with guide pins. On the lamp house base 20, a screw hole 31b is formed on the upper surface, and a concentric window hole 31c having a diameter slightly smaller than the screw hole 31b is formed. A storage section 31d is formed. The lamp housing 31d is continuously arranged below the window hole 31c.

A flat columnar partition plate 32 forming a horseshoe-shaped lamp housing portion 31d is fixed to the center of the arc portion at the tip of the lamp housing portion 31d by screws 33. As a result, a substantially semicircular curved tube housing portion is formed in the lamp housing portion 31d, and the lamp housing portion 31d is formed at this end.
The flow paths 31 e, 3
1f are respectively formed.

On the other hand, a curved tube discharge lamp M which is formed in an inverted U-shape and is, for example, an ultra-high pressure mercury lamp described in detail in FIG. 5 is disposed in a horseshoe-shaped lamp housing portion 31d, and has a socket flange 28a of a base 28. O-ring 34 on lamp house base 31
, And are screwed tightly. In addition, 35 is a terminal screwed to the flange, and 27L and 27R are leads of the curved tube discharge lamp M drawn out from the terminal.

A face plate 36 made of glass is fitted into the window hole 31c, and an outer edge of the face plate 36 is
8 are provided. By screwing the frame ring 39 into the screw hole 31b, the ring 38 is pushed downward to compress the O-ring 37, and the window hole 31c is kept airtight.

In such a configuration, when cooling water flows in from the flow path 31f, the water passes around the curved tube discharge lamp M and flows out from the flow path 31e, and the curved tube discharge lamp M is water-cooled. . Then, when the leads 27L and 27R are connected to a power supply, a high voltage is applied between the discharge electrodes 23L and 23R, a discharge occurs in the tube 21, and the inverted U-shaped curved tube discharge lamp M emits light as a light source. I was

[0015]

According to the above-mentioned conventional structure, the lamp housing portion 31d formed on the lamp house base 31 is provided.
(In the direction of arrow A in FIG. 7) from the curved tube discharge lamp M disposed at the center through a face plate 36 fitted in the window hole 31c.
For example, arrows B, C, and
There is a problem that the ultraviolet light emitted in the directions indicated by D, E and F is absorbed in the lamp housing 31d and cannot be used effectively.

Further, the thermal energy radiated to the back side of the curved tube discharge lamp M as shown by an arrow E is reflected on the bottom surface of the lamp housing 31d, returned to the curved tube discharge lamp M again, and discharged again. In order to heat the electric lamp M, there is a problem that the life of the curved tube discharge lamp M is shortened particularly in the case of a curved tube discharge lamp M whose electrode temperature reaches 1600 ° C. to 1700 ° C. like an ultra-high pressure mercury lamp.

An object of the present invention is to provide a lamp house for a curved tube discharge lamp which solves the above-mentioned problems, and an object to be solved by the invention is to emit ultraviolet light radiated from a curved tube discharge lamp in all directions. Is effectively scattered to the front surface of the object to be exposed or the object to be printed to obtain a lamp house for a curved tube discharge lamp in which the intensity of ultraviolet light reaching the object to be exposed or the object to be exposed is increased. It is to try.

Another object of the present invention is to return the heat energy radiated from the curved tube discharge lamp M back to the curved tube discharge lamp M so as not to reheat it, thereby extending the life of the curved tube discharge lamp. The purpose of the present invention is to obtain a lamp house with a curved tube discharge lamp capable of performing the following.

[0019]

A lamp house for a curved tube discharge lamp according to the present invention accommodates a discharge portion of the curved tube discharge lamp and has a substantially horseshoe-shaped counterbore hole serving as a cooling water channel. Lamp housing for a curved tube discharge lamp having a portion, provided with a reflector housed in a lamp housing portion and for radiating light emitted from a side surface direction to a back surface direction of the curved tube discharge lamp forward. It is.

According to the lamp house for a curved tube discharge lamp of the present invention, an object to be exposed or an object to be printed can be effectively irradiated with ultraviolet light radiated in all directions from the curved tube discharge lamp.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a curved tube discharge lamp house according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a perspective view of a curved tube discharge lamp house according to the present invention, and FIGS.
FIG. 3C is a plan, side, and bottom view of the lamp house for a curved tube discharge lamp of the present invention, FIG. 3 is an exploded perspective view of the curved tube discharge lamp storage device of the present invention, and FIG. is there.

FIGS. 1 and 2 show a lamp house for a curved tube discharge lamp of the present invention, which corresponds to the conventional lamp house base 31 shown in FIGS. 6A and 7.

As shown in FIGS. 1 and 2A to 2C, the lamp house 1 is formed of a substantially disk-shaped metal having a size of, for example, 110.times.20 tons, and a human-shaped protrusion 1b is provided at the center of the disk 1a. To form a counterbore 1c while radially extending from the center 1d of the disk 1a in the direction of the counterbore 1c.
A sector 1e is formed by dividing the range of 20 ° into seven equal parts. Within the other range of 140 °, the humanoid projection 1b and the counterbore 1c
Left and right semi-elliptical portions 1f and 1g are formed.

The plurality of sector-shaped portions 1e, 1e 'and the left and right semi-elliptical shaped portions 1f and 1g are directed from the hole diameter of the counterbore 1c to the humanoid projection 1b as shown in FIGS. As shown in the cross-sectional view as seen from the arrow D in (A), seven concave portions 1h are formed.

The left and right semi-elliptical portions 1f and 1g extend from the hole diameter of the counterbore 1c and the outer periphery of the humanoid protrusion 1b toward the outermost end boundary peak 1J of the sector 1e. A concave portion 1k is formed so as to form a curved surface.

Further, 30 m left and right from the center 1d of the disk 1a.
Terminal 3 of a curved tube discharge lamp M having a width of about 10 mm at a position of about m
5 and 35, and a left and right passage 1L serving as a cooling water passage to be described later.
And 1R are cut open from the outer periphery of the disk 1a and between the counterbore holes 1c to reach the left and right semi-elliptical portions 1f and 1g.

Therefore, a curved tube discharge lamp M, which is an ultra-high pressure mercury lamp formed in an inverted U-shape, can be disposed between the counterbore 1c and the human-shaped protrusion, and a passage through which water for cooling passes is provided. Thus, a horseshoe-shaped counterbore 2 is formed.

The plurality of concave portions 1h have a radius of curvature of about 15 mmR from 1.5 mm below the upper surface of the disk 1a as shown in a sectional view taken along the arrow D in FIG. 2A and as shown in FIG. 2B. Thus, a concave portion 1h is formed, and a deepest valley portion forming the horseshoe-shaped counterbore portion 2 is formed as a flat portion 1m. The flat portion 1m has a substantially elliptical shape as shown in FIGS. 1 and 2 (A) and has the same curvature (radius of about 22 mm) as the discharge portion of the curved tube discharge lamp M of the horseshoe-shaped counterbore portion 2. ).

1n is a screw hole formed on the back surface,
1p indicates a positioning pin.

The entire surface of the disk 1a of the lamp house 1 as described above is plated with nickel or the like, and at least the concave portions 1h and 1h and the flat portion 1m are mirror surfaces, and the concave portions 1h and 1h are concave mirrors. Thus, a reflecting mirror (plate) that scatters ultraviolet light emitted from the curved tube discharge lamp M disposed on the horseshoe-shaped counterbore portion 2 to the rear side (the lamp house 1 side) toward the front side is formed. .

One embodiment of a method of assembling the lamp house having the above-described configuration will be described with reference to an exploded perspective view of FIG.

In FIG. 3, reference numeral 1 denotes a lamp house. A base 3 with a flange 3a is screwed into a screw hole 1n formed on the back surface of the lamp house 1 via a screw hole 3b and fixed.

Next, a correction file 5 for correcting the light source image of the curved tube discharge lamp M is fitted so as to cover the irradiation window 4b of the irradiation ring 4a of the holder 4 from below, and is further transparent through a predetermined spacer. The face plate 6 made of a suitable quartz glass is held in the irradiation ring 4a.

The correction file 5 forms a plurality of circular and dome-shaped concave or convex portions 5c, 5c # along a horseshoe-shaped inverted U-shaped portion 5b on the surface of a quartz glass disk 5a. The concave or convex portions 5c, 5c # are formed as micro concave lenses or micro convex lenses.

Next, the bent tube discharge lamp M, which is bent in an inverted U-shape and has the terminal 35 attached thereto, is attached to the holder base 4c of the holder 4.
To be fixed.

That is, the terminal 35 of the curved tube discharge lamp M is inserted and fixed in the terminal insertion hole 4d formed in the holder base 4c.
The holder base 4c has water passage holes 4e, 4e communicating with the left and right passages 1L and 1R formed in the lamp house 1.

The socket 7 is disposed to face the holder base 4c, and joint pipes 7a, 7a through which cooling water flows in and out are planted at positions facing the water passage holes 4e and 4e. A through hole 7b into which the terminal 35 is inserted and projected is formed.

The holder base 4c and the socket 7 are integrally fixed by an appropriate method. In this manner, the sub-assembly in which the correction filter 5, the face plate 6, and the curved tube discharge lamp M are incorporated in the holder 4 is fitted to the lamp house 1 fixed to the base 3.

That is, the curved tube discharge lamp M is disposed in the horseshoe-shaped counterbore portion 2 of the lamp house 1, and the face plate 6 is hermetically fixed along the outer periphery of the disk 1a so that water does not leak. The curved tube discharge lamp storage device is assembled.

According to the above-described lamp house 1 of the present invention, as shown in FIG. 4, a curved portion from the peripheral portion of the curved tube discharge lamp M disposed in the concave portion 1h of the horseshoe-shaped counterbore portion 2 to the concave portion 1h side. UV light A, B, C, D, emitted toward the back of the tube discharge lamp M,
Since E and F are scattered by the concave portion 1h of the concave mirror and can be radiated to the irradiated surface 8 through the front face plate 6 and the correction filter 5, the irradiated surface 8 is irradiated. UV light intensity can be increased.

Further, the ultraviolet light radiated in the direction of the back of the curved tube discharge lamp M is applied to the flat portion 1m, so that, for example, the ultraviolet light G
Is scattered obliquely forward because the flat portion 1m is not formed with the concave surface portion 1h, and is reflected back to the curved tube discharge lamp M side to reheat the curved tube discharge lamp. Is removed. That is, the adverse effect of shortening the life of the curved tube discharge lamp M by reheating the curved tube discharge lamp M itself as heat energy can be eliminated.

In the lamp house 1 described above, radially
The case where the divided sector 1e is formed has been described.
The number of these divisions can be appropriately selected.
The reflecting mirror may be formed by using the c and the human-shaped projection 1b as one concave surface, and various modifications can be made without departing from the gist of the present invention.

[0043]

According to the lamp house for a curved tube discharge lamp of the present invention, the ultraviolet light radiated in all directions from the curved tube discharge lamp is effectively scattered in front of the object to be exposed or the object to be printed. Therefore, the intensity of ultraviolet light reaching the object to be exposed or the object to be printed can be increased, and the heat energy radiated from the curved tube discharge lamp M is returned to the curved tube discharge lamp M again so as not to be reheated. A lamp capable of extending the life of the tube discharge lamp is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a lamp house for a curved tube discharge lamp of the present invention.

FIG. 2 is a plan view, a side view and a bottom view showing one embodiment of a curved tube discharge lamp house according to the present invention.

FIG. 3 is an exploded perspective view of the curved tube discharge lamp housing device of the present invention.

FIG. 4 is an explanatory view of scattered light of a lamp house for a curved tube discharge lamp of the present invention.

FIG. 5 is a sectional view of a conventional curved tube discharge lamp (ultra high pressure mercury lamp).

FIG. 6 is a plan view of a conventional curved tube discharge lamp housing device.

FIG. 7 is a side sectional view of a conventional curved tube discharge lamp housing device.

[Explanation of symbols]

1 lamp house, 1a disk, 1b human shaped projection, 1c counterbore, 1e sector, 1L, 1R
‥ Left and right passage, 1m ‥‥ flat part, 2 ‥‥ shoe-shaped counterbore part,
M tube discharge lamp, 3 base, 4 holder, 5 mm
Correction filter, 6 ‥‥ face plate, 7 ‥‥ socket

Claims (3)

[Claims] 1. A lamp house for a curved tube discharge lamp having a lamp housing in which a discharge portion of a curved tube discharge lamp is housed and which has a substantially horseshoe-shaped counterbore serving as a cooling water channel, A lamp house for a curved tube discharge lamp, characterized in that a reflecting plate is provided for radiating light radiated from a side surface direction to a rear surface direction of the curved tube discharge lamp accommodated in the accommodating portion. 2. The reflecting plate formed in the lamp housing portion has a plurality of fan-shaped portions radially divided from the center of the horseshoe-shaped counterbore, and a concave mirror is formed in a radial direction of the plurality of fan-shaped portions. The lamp house for a curved tube discharge lamp according to claim 1, wherein the lamp house is formed. 3. The reflecting plate surface on the back side of the curved tube discharge lamp disposed in the horseshoe-shaped counterbore of the reflecting plate formed in the lamp housing portion is radiated from the curved tube discharge lamp. 2. The lamp house for a curved tube discharge lamp according to claim 1, wherein the heat energy is not reflected forward.