JP2778275B2 - Lamp house - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a lamp house of an ultra-high pressure mercury lamp used as a light source for exposure of a color cathode ray tube.

[0002]

2. Description of the Related Art Generally, in a shadow mask type color cathode ray tube, a method of applying a photoresist to an inner surface of a panel and exposing through a shadow mask is performed to obtain a black matrix film. As a feature of a photoresist having a large reciprocity law failure generally used as a photosensitive agent, as shown in FIG.
The light amount (brightness) of the light source acts as a parameter, and in order to make the hole diameter constant, it is necessary to make the light source brightness constant.

On the other hand, as shown in FIG. 4, the brightness of an ultra-high pressure mercury lamp used as a light source gradually decreases due to a change over time as compared with the initial stage of lighting. In order to prevent this, a method of changing the voltage applied to the ultrahigh pressure mercury lamp to increase the wattage and keeping the brightness constant as shown in FIG. 4 is usually adopted.

[0004]

However, the ultra-high pressure mercury lamp used here usually has an inner diameter of 1 mm to 2 m.
m, and a distance between electrodes (arc length) of about 10 mm to 30 mm is used. However, the wattage applied to this ultrahigh pressure mercury lamp has a limit, and the wattage is gradually increased to reach the limit. In such a case, puncture or devitrification occurs, and the product becomes unusable and becomes a life end. In particular, depending on the type of color CRT that requires a high amount of light (high brightness), the life of the ultra-high pressure mercury lamp is as short as three to four days.

An object of the present invention is to provide a lamp house which solves the above-mentioned problems.

[0006]

To achieve the above object, according to an aspect of the lamp house in accordance with the present invention is a lamp house having a shielding light tube and the reflective tube, the light-shielding tube, a semicircular cross section
The reflection tube has a diameter larger than the diameter of the light shielding tube.
The light-shielding cylinder and the reflection cylinder are cold
Is intended to be disposed on the both sides of the ultra-high pressure mercury lamp disposed却流fluid path, further wherein the shielding tube has a point light source
It said to have a circular opening produced is intended to cover the peripheral surface of the tube axis direction of ultra-high pressure mercury lamp, yet the reflection tube, before
It is reflected toward the serial light from an ultra-high pressure mercury lamp in the light shielding barrel
The flow rate of the cooling body is increased due to the large-diameter cross section.
Those who like to make.

[0007]

[0008]

[0009]

The cooling fluid passage 2 surrounding the ultra-high pressure mercury lamp 4 in the direction of the tube axis of the ultra-high pressure mercury lamp 4 is adjacent to the ultra-high pressure mercury lamp 4 and concentric with the tube diameter of the ultra-high pressure mercury lamp 4 and has a pipe structure with an upper half having a pipe structure. shielding tube 6 having an opening portion 6a to obtain, and the diameter d ₂ of the lower half is larger than the diameter d ₁ of the light-shielding tube (d _2>
d ₁ ) A concave reflecting mirror 5 is provided, and the same ultra-high pressure mercury 4
However, the same brightness was obtained at a low wattage.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 4 is a sectional view taken along line AA of FIG. In the figure, the interior of a lamp house main body 1 has a hollow structure, a cooling fluid passage 2 is formed, and a window glass 3 is attached to an upper portion of the lamp house main body 1 so as to face the cooling fluid passage 2. 3 blocks the atmosphere from the cooling fluid.

An ultra-high pressure mercury lamp 4 is mounted in the lamp house main body 1 such that its circumferential surface in the tube axis direction is exposed to the cooling fluid passage 2. The reflecting mirror 5 has a concave reflecting surface 5 a concentric with the ultrahigh-pressure mercury lamp 4, is installed in the lamp house main body 1 on the opposite side to the window glass 3, and has a lower half of the ultrahigh-pressure mercury lamp 4. It is designed to reflect light.

The light-shielding tube 6 has a semicircular cross section that covers the upper half of the ultrahigh-pressure mercury lamp 4, and has a circular opening 6a for obtaining a point light source at the end face facing the window glass 3. is there. The light emitted from the ultra-high pressure mercury lamp 4 travels in the radial direction of the tube axis of the ultra-high pressure mercury lamp 4, and the light in the lower half direction is reflected by the reflector 5 and returns to the center of the ultra-high pressure mercury lamp 4. The brightness of the light source toward the opening 6a for obtaining the brightness is increased by adding the brightness reflected from the reflecting mirror 5 to the conventional brightness. On the other hand, the light reflected by the reflecting mirror 5 increases not only the brightness but also the heat when returning to the ultrahigh-pressure mercury lamp 4, which adversely affects the life of the ultrahigh-pressure mercury lamp 4. In order to prevent this, it is necessary to increase the cooling flow rate. As a method of improving this, a method of increasing the supply pressure of the cooling water or increasing the sectional area of the cooling fluid passage 2 can be considered. There is a limit on the strength of the window glass 3 used at the boundary. On the other hand, as a method for increasing the cross-sectional area of the cooling fluid path 2, changing the diameter d ₁ of the upper half of the cooling fluid path 2, since the design change of the entire exposure system changes the product on Lande queuing pattern is required, which taken increase the diameter d ₂ of the lower half of the cooling fluid channel 2 in order to avoid, a method of increasing the coolant flow rate is considered. In this case, taking into account the increase in light quantity (brightness),
d ₂ is represented by the following equation.

[0013] _{^{√ (1.3d 1 2 -0.3d 0 2}} ) d 2: the reflecting mirror 5 d _1: the diameter d ₀ of the light-shielding tube 6: Results of the glass tube outer diameter experimental ultra high pressure mercury lamp 4, the present invention By using the same lamp house, the brightness increased by 30% at the same mercury lamp and the same wattage.

[0014]

As is clear from the above description, the lamp house according to the present invention can be used with a lower wattage than the conventional lamp house, and is sufficiently resistant to the aging of the ultra-high pressure mercury lamp. Feedback of high wattage is possible, and the life of the ultra-high pressure mercury lamp is 4 ~
5 times longer.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a lamp house according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing a relationship between a hole diameter and an exposure light amount when a photoresist having a large reciprocity is used.

FIG. 4 is a diagram showing a change over time in brightness of an ultra-high pressure mercury lamp.

FIG. 5 is a relationship diagram between power wattage and brightness for keeping brightness constant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp house main body 2 Cooling fluid path 3 Window glass 4 Ultra-high pressure mercury lamp 5 Reflector 6 Shielding tube

Claims (1)

(57) [Claims] 1. A lamp house having a shielding light tube and the reflective tube, the light-shielding tube is of a semicircular cross section, reflective tube, the
The light-shielding cylinder has a semicircular cross section with a diameter larger than the diameter of the light-shielding cylinder, and the light-shielding cylinder and the reflection cylinder are disposed on both sides of an ultrahigh-pressure mercury lamp disposed in a cooling fluid passage , Further, the light shielding tube has a circular opening for generating a point light source.
Intended to cover the peripheral surface of the tube axis direction of the ultra-high pressure mercury lamp having
There, further wherein the reflective tube, the causes and reflects the light from the ultra-high pressure mercury lamp in the <br/> shielding tube, the large径断surface shape
A lamp house characterized in that the flow rate of the cooling body is increased .