JP4069828B2 - Light source device - Google Patents

Description

The present invention relates to a light source device which is used in combination with a reflecting mirror and which is optically efficient and is mainly a light source for video equipment or optical equipment.

Conventionally, such light source devices are mainly used for projectors, projection TVs, projectors, and the like.

Projectors using this reflective lamp are becoming popular as a substitute for television (CRT) and OHP (overhead projector). Among them, the spread of liquid crystal projectors and DLP (digital light processing) projectors is remarkable.
The requirements for such a projector include high resolution, high definition, improved brightness, uniformity of the illuminated screen, small size, light weight, and low cost. In recent years, the transmittance of an LCD (liquid crystal display) panel used in each projector and the reflectance of a DMD (digital mirror device) chip have been remarkably improved, and characteristics can be improved with smaller elements.

To meet these demands for small size, light weight and low cost, LCD chips or DMD chips used in projectors are becoming smaller, and light source devices used are also required to be downsized. In such a background, light source devices are required to improve light utilization in addition to miniaturization.

When considering miniaturization of the projector, miniaturization of the light source device is one of the mandatory conditions. At present, the miniaturization of the reflector used is also progressing, and a light source device having a size smaller than the outer size of 50 mm × 50 mm is considered even in the 150 W class. In addition, the depth of the light source device is an important item for downsizing, and the discharge lamps are becoming shorter.
Due to the smaller size of the reflector, the effective reflection area is reduced, and there is a concern that the emitted light will be reduced. However, by shortening the arc of the discharge lamp, improving the luminous efficiency, and using an elliptical mirror, etc. There is no significant decrease in emitted light.

The shortening of the discharge lamp by reducing the depth of the light source device is often dealt with by shortening the seal length. When the seal length is shortened, the temperature of the welded portion between the molyb foil and the power supply line is increased. The oxidation of the welded portion is promoted, resulting in a problem of non-conduction and short lighting. In order to suppress oxidation at such welding point temperature, air may be blocked by filling with a frit agent, etc., but sufficient effect until the end of the life of the light source device has not been obtained. At present, it must be used.

An adhesive mainly composed of heat-resistant alumina and silica is used for the sealing part on the bottom side of the reflecting mirror when fixing to the reflecting mirror, and in some cases, a ceramic insulator is often used.
In such a case, a heat retention effect by an adhesive or the like also occurs, which is disadvantageous for a temperature rise. However, there is a case where a cooling structure is improved by providing a ventilation structure by devising a ceramic structure (patent) Reference 2). Furthermore, there are cases where the power supply line and the external line are connected inside the ceramic insulator. In this case, in addition to working against the temperature rise, it may be disadvantageous for shortening depending on the handling of the connection part. Become.

When considering shortening the length as a top priority, there is an example in which the connection between the power supply line and the external line is made where there is no influence on the depth of the light source device . However, as in the conventional example shown in FIGS. how to wire connection to the external line 22 is bent substantially at right angles to the optical axis X of the reflector 21 to 20 at the end face 24 side of the base 23 is most efficient. However, in such a case, a load is applied from the bent portion of the power supply line 20 to a portion in the base 23, and the mechanical strength becomes a problem.

That is, FIG. 6 shows an enlarged view of a power supply line bent portion of the conventional example. A portion where the power supply line 20 is bent is indicated by A in the drawing. The bent portion A is rotated in the circumferential direction of the base 23 along the end surface 24 of the base 23 as shown by the arrow in the drawing (see FIG. 6A), or the optical axis X of the reflecting mirror 21. since the fulcrum for the movement of the direction or are swung in a direction perpendicular to the optical axis X (see FIG. 6 (b)) the power supply line 20, Ri Ah at a portion most external load is applied, and, from that portion a Since the mechanical strength of the portion in the base 23 is lowered due to the thermal influence when the arc tube sealing portion of the discharge lamp is sealed, there is a possibility of breaking when a load is applied from the outside. Further, when the external line 22 is connected to the power supply line 20 from the state of FIG. 6, a larger load is applied from the bent portion A of the power supply line 20 to the portion in the base 23, which is a problem. Things can be easily guessed. Reduces mechanical strength

In order to block the force generated when an action such as twisting or pulling the power supply line is performed against such a problem, there is also an example in which the power supply line is fixed by a supply line fixing member protruding from the reflector bottom side. Although it has been reported (see Patent Document 1) , it is obvious that it is disadvantageous when considering the viewpoint of miniaturization, particularly the depth of the light source device.
In addition, there are cases where a cradle for connection is provided on the reflector, such as the connection between the power supply line on the open side of the reflector and the external line. A hole must be drilled, not only detracting from the characteristics of the reflector, but in order to avoid damaging the effective surface of the reflector as much as possible, a cradle must be attached to the open part of the reflector. Therefore, it is necessary to keep the power supply line on the bottom side of the reflector long. In such a case, there arises a problem of high voltage for lighting the light source device and insulation of peripheral components.

JP 2002-260432 A Japanese Patent No. 3353893

The invention, when considered in top priority in size of the light source device, as no influence the wiring of the power supply line and the external line to the depth of the light source device, bent substantially at a right angle to the optical axis power supply line, It is an object of the present invention to provide a good light source device which does not cause a problem in mechanical strength even when it is efficiently downsized, and does not cause a problem of high voltage for lighting the light source device and insulation of peripheral components.

To achieve the above object, the present invention is double ended discharge lamp having a pair of electrodes are disposed the optical axis in the reflector, one end of the discharge lamp is fixed to the reflector bottom portion has a cap, reflector In a reflector-integrated light source device having a structure in which a power supply line on the side fixed to the bottom part is connected to an external line near the bottom part of the reflector, the power supply line extends along the end face of the base. After being bent at a substantially right angle to the optical axis of the reflector, it is bent along the side of the base, and the part along the side is fixed to the base by the support attached to the base. Features.

In the light source device according to the present invention, the power supply line on the side fixed to the bottom part of the reflector of the double-end type discharge lamp is bent substantially perpendicular to the optical axis of the reflector so as to be along the end face of the base. from being fixed to the base in a state, where there is no influence of connection of the power supply line and the external line to the depth of the light source device that is, carried out in the vicinity of the reflector bottom portion, miniaturization of the light source apparatus, in particular shortening of Can be planned. In such a case, conventionally, it is necessary to bend the power supply line in order to connect it to the external line . At that time , a load is applied to the bent portion of the power supply line, but this power supply line is made to follow the end face of the base. By fixing to the base in a bent state and then connecting to the external line, the load on the bent portion of the power supply line is greatly reduced, and no problem is caused in mechanical strength. Further, by connecting the power supply line and the external line in the vicinity of the bottom of the reflector, there is no problem of high voltage for lighting the light source device and insulation of peripheral components.

Next, Embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a diagram omitting a part of an embodiment of a light source device according to the present invention. In the figure, reference numeral 1 denotes a quartz glass double-end type discharge lamp arranged on the reflecting mirror 4 on the optical axis , and electrodes 2a and 2b are embedded and fixed in sealing portions at both ends of the discharge lamp 1. The distance 1 between the electrodes 2a and 2b, that is, the arc length is 1.0 mm. 5 is a base, 7 is a cradle, 8 is a power supply line, 9 is a support, 10 is an insulator, and 11 is an external line.

In the discharge lamp 1 formed in this manner, halogen gas, Hg, and starting argon are enclosed as an enclosure. 3a and 3b are molybdenum foils connected to the electrodes 2a and 2b, connected to the power supply line 8, and connected to the ballast via the external line 11 connected to the power supply line 8 .

The discharge lamp 1 is fixed to the bottom of a dichroic reflector 4 with an inorganic heat resistant adhesive 6 mainly composed of alumina and silica through a base 5 to constitute a light source device. The power supply line 8 on the side fixed to the bottom of the reflecting mirror 4 via the base 5 is substantially perpendicular to the optical axis X of the reflecting mirror 4 so as to be along the end face 14 of the base 5 as shown in the figure. After being bent, the portion is bent along the side surface 15 of the base 5, and the portion along the side surface 15 is fixed to the base 5 by the support 9 attached to the base 5. In this way, the power supply line 8 is fixed to the base 5 while being bent at a substantially right angle with respect to the optical axis X of the reflecting mirror 4 so as to be along the end surface 14 of the base 5. There is no risk of breakage due to a load applied to the bent portion of the wire.

The light source device as described above is lit horizontally using a dedicated electronic ballast at a power of 150 W so that the discharge lamp shaft is horizontal.

As shown in FIGS. 2 and 3, the support 9 is mounted on the side surface 15 of the base 5, and is fitted into a concave groove 12 formed in an annular shape along the circumferential direction of the side surface 15. Incidentally, the provision of the recessed groove 12 is for the attachment of the support 9 and the stronger ones.

As shown in FIGS. 3A and 3B, the side surface 15 of the base 5 is formed with a concave groove 18 into which the power supply line 8 bent so as to be along the side surface 15 is fitted. This of providing concave groove 13 is for the purpose of further securing the movement of the power supply line 8, it is possible to further improve the mechanical strength.

The embodiment is a short arc type mercury lamp, but a metal halide lamp or a xenon lamp having a similar structure may be used.

The utilization of the present invention is mainly used for projectors, projection TVs, projectors, and the like.

Schematic longitudinal sectional view of a light source apparatus according to the present invention The partially expanded longitudinal cross-sectional view of the light source device which concerns on this invention 1 is a partially enlarged vertical view of a light source device according to the present invention and a rear view of a base. Schematic longitudinal sectional view of a conventional light source device Schematic longitudinal sectional view of a conventional light source device Partially enlarged rear view and partially enlarged longitudinal sectional view of a conventional light source device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Discharge lamp 2a, 2b ... Electrode 3a, 3b ... Molybdenum foil 4 ... Reflective mirror 5 ... Base 6 ... Inorganic heat-resistant adhesive 7 ... Base 8 ...・ Power supply line 9 ... support 10 ... insulator 11 ... external line 12 ... concave groove 13 ... concave groove
14 ... End face of the base
15: Side of the base
X ... Optical axis of reflector

Claims (3)

A double-ended discharge lamp (1) having a pair of electrodes is arranged on the reflecting mirror (4) with an optical axis, and one end of the discharge lamp has a base (5) and is fixed to the reflecting mirror bottom part. In the reflector-integrated light source device having a structure in which the fixed power supply line (8) is connected to the external line (11) in the vicinity of the bottom of the reflector, the power supply line (8) is a base. after being bent approximately at right angles to the end face the optical axis of the reflector so that along the (14) in (5) (X), is bent so as to extend along the side surface (15) of the base (5), A light source device characterized in that a portion along the side surface (15) is fixed to the base (5) by a support (9) attached to the base (5) . The support (9) is mounted on the side surface (15) of the base (5) and is fitted into a concave groove (12) formed in an annular shape along the circumferential direction of the side surface (15) . The light source device according to claim 1 . A side surface (15) of the mouthpiece (5), its side (15) according to claim bent by said fitted into the power supply line (8) grooves (13) are formed such that along the 1 or 2 The light source device described.

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