JP3456141B2 - How to incorporate a high-pressure discharge lamp into a reflector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base of a high pressure discharge lamp, and more particularly to a base structure for installing a compact short arc high pressure discharge lamp for projection in a reflecting mirror.

[0002]

2. Description of the Related Art A high-pressure discharge lamp, especially a small high-pressure discharge lamp with a short arc, is used in a liquid crystal projection type projector. At this time, for the purpose of projecting, the lamp is installed so that the focal position in the reflecting mirror and the lamp light emitting portion are aligned with each other. FIG. 3 shows a general lamp installed in a reflecting mirror. In general, the lamp is of a double-base type and is horizontally lit, and one side of the base is inserted and fixed in a hole in the center of the reflecting mirror. By fixing the lamp light emitting part and the reflecting mirror at a position where the focal point of the mirror matches, parallel light is obtained in the projection direction, and the light is transmitted to the liquid crystal panel in the required optical system.

The base structure on the side inserted into the reflecting mirror is
As shown in FIG. 3, the side portion of the arc tube is inserted into a cylindrical base made of a conductive material, and a drawer at the end of the base is exposed from the arc tube. Through the line
The base and the lead wire are welded at the end. The gap between the side of the arc tube and the cap covered, and the gap between the cap and the reflecting mirror are fixed by a filler such as cement. The end of the base is a screw type to attach the lamp to the jig when positioning the lamp at the focal position, and after fixing
This is because it is used to connect the power supply line from the lighting circuit.

[0004]

A high-pressure discharge lamp consumes a considerable proportion of input power as heat. Particularly in the case of a high-pressure discharge lamp with a small size and a short arc, the discharge arc reaches 6000 ° C, and the arc tube reaches 800 ° C to 1000 ° C. The arc tube temperature is higher by about 100 to 200 ° C. than that of a general high pressure discharge lamp. The generated heat is transmitted to each part from the discharge arc inside the arc tube, and the part of the base is also heated.

Since the lamp is generally operated in the atmosphere,
The part of the die that is made of a metallic material and has a high temperature is often oxidized. In particular, when the welded portion of the base and the lead wire is oxidized, the contact resistance increases, and further, the base and the lead wire are separated from each other, which causes the lamp not to light.

In the present invention, when the target small short arc high pressure discharge lamp is installed in the reflecting mirror for projection, the reflecting mirror becomes smaller than the case where the conventional lamp is used, and the focus position of the reflecting mirror becomes smaller. Since the distance between the lamp and the hole at the center of the reflector is small, the distance from the discharge arc to the base is short, and the base temperature is likely to rise.

The present invention invents a method of maintaining the power supply and guaranteeing the lighting state of the lamp even under the condition that the welded portion is oxidized by the temperature rise of the base, and provides a lamp having a base structure based on the method. The purpose is to

[0008]

To achieve the above object, the following means are used.

Incorporating a high-pressure discharge lamp into the reflector of the present invention
No method is provided with the light emitting tube, and the discharge electrode located on the side of the arc tube, a spiral lead lines which are electrically connected are taken out to the outside of the arc tube to the discharge electrode, the
The high-pressure discharge lamp is smaller than the maximum diameter of the arc tube.
Inserted from the front surface of the reflector in the reflector lamp insertion hole having again minimum diameter, said the inserted side of the arc tube reflecting mirror, the inner diameter from the rear surface of the reflector to the diameter of the luminous bulb side
Through a ring-shaped lid whose inner surface has a spiral groove, and twist the base having a spiral groove on the inner surface into the spiral leader line from the rear surface of the reflecting mirror to form the high pressure discharge lamp and the reflecting lamp. injecting cement between the insertion hole.

Incorporating a high-pressure discharge lamp into the reflector of the present invention
No method, a light emitting tube, and the discharge electrode located on the side of the arc tube, the high pressure discharge is electrically connected to the discharge electrode and a lead line that is taken out to the outside of the arc tube The lamp has a minimum diameter smaller than the maximum diameter of the arc tube.
Inserted from the front of the reflector in the reflector lamp insertion hole having
Then, on the side of the arc tube inserted into the reflecting mirror , the inner diameter is approximately equal to the diameter of the side of the arc tube from the rear surface of the reflecting mirror.
Through a ring-shaped lid, weld the spiral lead wire to the lead wire, and attach the base having the spiral groove on the inner surface from the rear surface of the reflecting mirror to the spiral lead wire. narrowing twisting, injecting cement between the high-pressure discharge lamp and the reflector lamp insertion hole.

[0011]

[0012]

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a base structure for a high pressure discharge lamp according to the present invention will be described with reference to the drawings.

(First Embodiment of the Invention) The first embodiment of the present invention is a base structure for maintaining the power supply and guaranteeing the lighting state of the lamp even under the lamp lighting condition in which the welded portion is oxidized by the temperature rise of the base. Is.

FIG. 1 shows a state of a high pressure discharge lamp having a base structure according to the first embodiment of the present invention. In the arc tube side portion 2 on the side where the base 1 is mounted, there is a lead wire 4 that is electrically connected to the discharge electrode 3 and is taken out to the outside of the arc tube. The base 1 has a cylindrical shape formed of a conductive metal material such as copper, and has a thin hole 5 at its end. The arc tube side portion 2 is inserted into the base 1, and the lead wire 4 is taken out through the hole portion 5.

At the end of the base 1, there is a weld 6 where the base 1 and the lead wire 4 are welded. Resistance welding or plasma welding is used. By welding this portion, electrical continuity between the lamp and the base 1 is guaranteed. The lamp is turned on by connecting the power output end of the lighting circuit between the base 1 and the lead wire on the side where the base is not attached.

A feature of the present invention is that the lead wire 4 has a spiral shape inside the base 1. In the case of the conventional example which does not have such a structure and in which a linear lead wire is simply passed through the hole 5 and welded at the end, under the lamp lighting condition in which the welded portion oxidizes, the base and the lead wire It was observed that the lamp peeled off and the lamp did not light. This means that it is difficult to ensure the electrical connection between the mouthpiece and the lead wire in the hole by merely making contact.

As described above, the spiral shape is employed in order to maintain the electrical continuity between the mouthpiece and the lead wire at other portions even when the welded portion, which was conventionally located at one place, is peeled off. This is because a large contact area between them is secured in advance. By setting the spiral winding diameter to be equal to or larger than the inner diameter of the die, tension is generated in the direction of pressing against the inner side surface of the die at the portion of the helical lead wire.

With such a structure, even if the welded portion 6 is peeled off, the electrical continuity is maintained and the lamp does not turn off.

The number of spiral turns is not limited to one, but may be plural. Further, even when the inner cross section of the die is different from the circular shape, it may be a spiral shape that generates tension in the direction of being pressed against the inner surface of the die.

Similar to the conventional example, when the gap between the side of the arc tube and the covered cap is filled with cement or the like, the spiral lead wire 4 should be sufficiently pressed against the inner bottom surface of the base to fix it. good. This is because the contact area with the inner surface of the die is further increased.

Further, by fixing the lamp with cement in this way, the contact portion inside the base is also covered with the filler, so that even if the temperature becomes high when the lamp is turned on, it does not come into direct contact with the atmosphere, and the contact portion is oxidized. Deterioration is also greatly suppressed, which is very advantageous as compared with the conventional example having only the welded portion 6 exposed to the atmosphere at the end.

FIG. 2 shows a case where the inner surface of the die 1 in FIG. 1 has a spiral groove. The internal cross section of the base is circular. The other configuration is the same as that of FIG.
The lead wire 8 has a spiral shape as in FIG.
When inserting into, it is done by screwing. With such a configuration, compared to the case of FIG. 1, the contact state between the inner surface of the die and the lead wire 8 is easily and surely realized such that the male screw and the female screw come into contact with each other.

In the configuration example of FIG. 1, the tension applied to the inner surface of the die is used, but in this example, the contact state is ensured by aligning the irregularities of the spiral screw groove. Since tension is not used, handling in actual configuration becomes easy.

The number of spiral turns is not limited, but 2
It is better to have multiple rolls of about 3 rolls. This is because the force applied to the groove during insertion is dispersed (does not wobble), and the central axis of the lamp is easily inserted parallel to the central axis of the base.
This is because it is advantageous for aligning the discharge arc when fixing the lamp to the reflecting mirror. Of course, also in the case of this example, it is very effective to fill the gap between the side portion of the arc tube and the covered cap with cement or the like as in the conventional example, and the reason is as described above.

There is another reason why the configuration of FIG. 2 is effective. As described in the section of the prior art, the lamp is attached to the reflecting mirror at a predetermined position after the base is attached. For fixing the lamp, cement is used as well as fixing the base. In the working process, after the position of the lamp is determined, liquid cement is poured into the gap with the reflector lamp insertion hole 9. At that time, it is necessary to pay attention to the dripping that flows through the gap to the surface of the reflecting mirror at the time of cement injection. Due to dripping, the glossy reflective film on the surface may become dirty and the projected light may decrease.

In order to prevent this accident to a minimum, a ring-shaped lid 10 is provided in the gap so that the cement does not flow out.
There is a way to do it. The structure is shown in FIG. In the manufacturing process, the ring-shaped lid 10 whose inner diameter is approximately equal to the diameter of the side is first passed through the side of the arc tube with no base attached, and then the base is attached, and the end from the rear side of the reflecting mirror to the side without the base. The first part is installed in the reflecting mirror lamp insertion hole 9.

Since the outer diameter of the lid 10 is larger than the minimum diameter of the lamp insertion hole portion 9 of the reflecting mirror, the lamp cannot be inserted any further as the base contacts the lid 10. In this state, the lamp is set at a predetermined position and cement is poured and fixed.

The problem is that the maximum diameter of the arc tube is larger than the minimum diameter of the reflector lamp insertion hole 9. In this case, the lamp can be installed in the lamp insertion hole 9 of the reflecting mirror only from the front surface of the reflecting mirror and the lid from the rear surface of the reflecting mirror. Figure 2
The cap structure shown in can be used.

The lamp is inserted from the front side of the reflecting mirror, the lid 10 is passed through the inserted arc tube side portion 2 from the rear part of the arc tube, and the base is inserted by screwing. Spiral lead wire 4 at this time
When the maximum diameter is large and the lid 10 cannot be inserted, the spiral lead wire 4 is not prepared at the time of sealing the arc tube, and it may be connected by welding after inserting the lid 10.

That is, the spiral lead wire 4 need not be a single material as long as it is a conductive material, and the same material or one or more welded portions may be used. The structure shown in FIG. 2 is also effective for preventing dripping when installing the insertion hole of the reflecting mirror of the lamp.

(Embodiment 2 of the Invention) Under the lamp lighting condition in which the welded portion is oxidized due to the temperature rise of the base, the idea for maintaining the power supply and guaranteeing the lighting state of the lamp is (1) the base and the drawer. The above-mentioned content is provided from the two viewpoints of providing a contact portion with the wire other than the welded portion to reduce the probability of lamp non-lighting, and (2) covering the contact portion between the base and the lead wire so as not to oxidize. Proposed.

As another effective means, there is a method of electrically contacting the inner surface of the die with the inserted lead wire by filling the inside with a conductive filler. Specifically, the cermet is matched to the shape of the filling portion and brazing is performed with a brazing material containing silver as a main component. In the case of filling with cement in the conventional configuration, since it is simply passing through the hole portion 5 of the die, as compared with the present method in which all the gaps are filled with a conductive filler, the inner surface of the die and the lead wire are The area of electrical contact with is greater with this method and contact is reliably maintained.

FIG. 5 shows an example. The lead wire 4 has a structure in which the lead wire 4 is wrapped around the arc tube side portion 2.
A conductive filler 11 is filled in the gap between the base 1 and the arc tube side portion 2. The diameter of the spiral when folded back is the inner diameter of the mouthpiece 1 so that it can be fixed so as not to wobble during insertion. Such a configuration not only ensures the electrical conduction state as compared with the conventional structure, but also eliminates the need to draw the lead wire through the hole to the outside of the base and weld it as in the conventional example, and simplifies the manufacturing process. . The appearance is smooth and looks good.

In the example shown in FIG. 5 as well, a screw groove is formed on the inner surface of the die as shown in FIG. 2, and the lead wire 4 wound back in FIG. 5 is used for screwing. In this case, the electrical continuity becomes more reliable.

In addition to the structure shown in FIG. 5, FIG. 6 shows a screw thread provided on the outer peripheral surface of the base 1, and a screw groove provided on the inner peripheral surface of the lamp insertion hole 9 of the reflecting mirror. is there.

With such a structure, there is an advantage that the step of fixing the lamp to the reflecting mirror can be simplified.

Further, instead of the cement filling in the configurations of FIGS. 1 and 2, the conductive filler used in the second embodiment may be used.

[0039]

The non-lighting of the lamp has a strong relation with the definition of the lamp life. The non-lighting in the definition of the lamp life refers to the one caused by the limit of the performance of the lamp itself such as the deterioration of the electrode or the deterioration of the material of the arc tube (excluding the part depending on the performance of the lighting circuit). However, if non-lighting occurs due to a defective contact other than the lamp in this case, especially in the early stage of lighting, it gives the user a misunderstanding about the originally guaranteed lamp life and causes troubles such as replacement. Could give you. According to the present invention, the original life of the lamp can be surely guaranteed to the user.

[Brief description of drawings]

FIG. 1 is a diagram showing a high pressure discharge lamp having a cap structure for a high pressure discharge lamp according to a first embodiment of the present invention.

FIG. 2 is a view showing a case where the inner surface of the die 1 of FIG. 1 has a spiral groove.

FIG. 3 is a partial cross-sectional view showing a conventional example.

FIG. 4 is a partial cross-sectional view showing a high pressure discharge lamp device using the base structure of the high pressure discharge lamp according to the present embodiment.

FIG. 5 is a diagram showing a high pressure discharge lamp having a cap structure for a high pressure discharge lamp according to a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing a high pressure discharge lamp device using a base structure for a high pressure discharge lamp according to a second embodiment of the present invention.

[Explanation of symbols]

1 mouthpiece 2 Side of arc tube 3 Discharge electrode 4 Leader line 5 holes 6 welds 7 base 8 leader line 9 Reflector lamp insertion hole 10 lid 11 Conductive filler

Continuation of the front page (56) Reference JP-A-6-260081 (JP, A) JP-A-5-54701 (JP, A) Actually opened 63-9785 (JP, U) Actually opened 55-93957 (JP , U) Actual flat 3-106615 (JP, U) Actual flat 3-106616 (JP, U) Actual flat 3-124411 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB) Name) H01J 5/50 F21S 2/00 F21V 19/00

Claims (2)

(57) [Claims] 1. A method for incorporating a high-pressure discharge lamp into a reflecting mirror, comprising : an arc tube, a discharge electrode located on a side portion of the arc tube,
A helical lead lines which are electrically connected are taken out to the outside of the arc tube to the discharge electrode, the high-pressure discharge lamp having a smaller minimum diameter than the maximum diameter of the arc tube
Inserted from the front of the reflector in the reflector lamp insertion hole having
Then, on the side part of the arc tube inserted in the reflecting mirror , the inside diameter is approximately equal to the diameter of the side part of the arc tube from the rear surface of the reflecting mirror.
Through ring-shaped lid, the cap having a helical groove on the inner surface, narrowing twisting from the rear surface of the reflector to the helical lead wire, the high-pressure discharge lamp and the reflector lamp insertion hole Inject cement between the and the high-pressure discharge lamp on the reflector
How to get in . 2. A method for incorporating a high-pressure discharge lamp into a reflecting mirror, comprising : an arc tube, a discharge electrode located on a side of the arc tube,
A lead wire electrically connected are taken out to the outside of the arc tube to the discharge electrode, the high-pressure discharge lamp provided with a anti <br/> having a smaller minimum diameter than the maximum diameter of the arc tube It is inserted into the mirror lamp insertion hole from the front side of the reflecting mirror, and the inner diameter of the side of the arc tube inserted into the reflecting mirror is approximately equal to the diameter of the side of the arc tube from the rear surface of the reflecting mirror.
Through a ring-shaped lid, weld the spiral lead wire to the lead wire, and twist the base having a spiral groove on the inner surface from the rear surface of the reflector to the spiral lead wire. Inject cement between the high pressure discharge lamp and the reflector lamp insertion hole , and install the high pressure discharge lamp in the reflector.
How to get in .