JP2002175716A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix part of the circumferential surface and the end faces of a discharge lamp 9 by bonding them to lamp holders 1 by an adhesive 11, to accurately and solidly fix the discharge lamp 9 to predetermined positions of the lamp holders 1, and to reduce the cost of a light source device. SOLUTION: Each lamp holder 1 is semicylindrically formed with a bottom 2, a side wall 3 and end faces 4 and 5, and a lamp insertion hole 6 opened to the one end face 4, adhesive filling recessed parts 7 and an adhesive injection hole 8 are formed inside. Each adhesive filling recessed part 7 is formed by recessing the hole wall of the lamp insertion hole 6 in a semicylindrical elongate slot-like form. The adhesive injection hole 8 is opened to and communicates with the lamp insertion hole 6 and is opened to the other end face 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device used as a reading light source for OA equipment such as a copying machine or a scanner or a backlight light source for a liquid crystal display device. The present invention relates to a light source device having an improved shape of a lamp holder for fixedly holding a discharge lamp at a desired position.

[0002]

2. Description of the Related Art Conventionally, this kind of light source device comprises a lamp holder and a discharge lamp, wherein an end of the discharge lamp is inserted into a lamp insertion hole of a lamp holder having a lamp insertion hole opened at one end surface inside. The discharge lamp was fixed to the lamp holder with an adhesive interposed between the end surface of the discharge lamp and the outer end surface of the lamp insertion hole. This conventional example is shown in FIGS.
This will be described specifically based on First, in FIGS. 14 and 15, the lamp holder 100 has a flat bottom surface 101.
And a side wall 102 having an upper part formed in an arched curved surface and a lower part formed in a vertical wall surface, and end faces 103 and 104, and are formed in a semi-cylindrical shape. Inside the lamp holder 100, there is a lamp insertion hole 105 opening at one end face 103, and at the center of the outer end face facing the opening of the lamp insertion hole 105, an adhesive horizontally penetrating the other end wall of the lamp holder 100. The inner end of the injection hole 106 is open. Then, the end of the discharge lamp 9 is inserted into the lamp insertion hole 105, and the adhesive 11 is pressed into the inside of the adhesive injection hole 106 through the opening of the other end surface 104 of the adhesive injection hole 106. The inside diameter of the lamp insertion hole 105 is about 0.1 from the outside diameter of the end of the discharge lamp 9.
As shown in FIG. 15, the adhesive 11 can be fed into a gap formed between the outer peripheral surface of the end portion of the discharge lamp 9 and the hole wall of the lamp insertion hole 105 as shown in FIG. No, the end face of the discharge lamp 9 and the lamp insertion hole 1
The gap between the outer end surface of the discharge lamp 9 and the adhesive injection hole 106 is filled, and the end surface of the discharge lamp 9 and the outer end surface of the lamp insertion hole 105 are fixed with the adhesive 11, so that the discharge lamp 9 is positioned at a predetermined position of the lamp holder 100. It was held stationary. In the light source device shown in FIGS. 14 and 15 described above, the gap between the outer peripheral surface of the discharge lamp 9 and the hole wall of the lamp insertion hole 105 is narrow, so that the adhesive 11 may enter the gap. Is impossible, and the discharge lamp 9 is fixed to the lamp holder 100 by the adhesive force of the adhesive 11 filled between the end face of the discharge lamp 9 and the outer end face of the lamp insertion hole 105. There was a drawback that it was weak and had low durability. In order to solve the disadvantages of the light source device shown in FIGS. It is conceivable to form a gap between the hole wall and the adhesive so that the adhesive can enter the hole wall. However, when the discharge lamp is inserted into the lamp insertion hole and the adhesive is pressed and filled, the gap between the outer peripheral surface of the discharge lamp and the hole wall of the lamp insertion hole is too large, and the discharge lamp is fixed to a desired position of the lamp holder. It was extremely difficult to do so. Therefore, there has been proposed a light source device in which the end surface of the discharge lamp and a part of the peripheral surface of the end portion of the discharge lamp are fixed to the lamp holder with an adhesive without changing the inner diameter of the lamp insertion hole. An example of this light source device will be described with reference to FIGS. 16 and 17.
02, an opening 107 communicating with the lamp insertion hole 105 is formed by cutting out a length substantially equal to the length of the lamp insertion hole 105 in the lamp insertion direction from the one end surface 103 to the other end surface 104. An adhesive 11 is filled and adhered to a portion of the discharge lamp 9 exposed at the opening 107, the opening 107 is closed with the adhesive 11, and a fixing portion between the discharge lamp 9 and the lamp holder 100 by the adhesive 11 is formed. ,
The discharge lamp 9 and the lamp holder 100 are more firmly fixed to each other at two positions corresponding to the opening 107 and the end face of the discharge lamp 9.

[0003]

However, in the light source device shown in FIGS. 16 and 17 of the prior art, an adhesive application opening is formed in the side wall of the lamp holder so as to open into the lamp insertion hole. Therefore, the opening area of the discharge lamp has an advantage that the fixing strength is large because it is fixed to the lamp holder with an adhesive, but requires an operation of applying an adhesive to the opening, and the production efficiency is poor, In addition, there is a problem that the cost is increased. Therefore,
According to the present invention, in order to solve the above-mentioned problems of the related art, a hole wall of a lamp insertion hole provided inside a lamp holder is depressed, and an adhesive filling recess opening in the lamp insertion hole is formed. It is recessed at a predetermined interval, the adhesive filling recess is formed by press-fitting the adhesive from an adhesive injection hole opening formed on the other end surface of the lamp holder, a gap between the discharge lamp end surface and the lamp insertion hole outer end surface, and An adhesive is filled into the adhesive injection hole, and at least two portions of the outer peripheral surface and the end surface of the discharge lamp are fixed to the lamp holder with an adhesive by a single adhesive press-in operation, and the discharge lamp is mounted on the lamp holder. It is an object of the present invention to provide a low-cost light source device that is firmly and precisely fixed at a predetermined position.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, a lamp insertion hole opening at one end surface inside a lamp holder, the lamp insertion hole, An end of the discharge lamp is inserted into the lamp insertion hole, and an end surface of the discharge lamp and an outer end surface of the lamp insertion hole are provided. The discharge lamp is filled with an adhesive and the lamp holder is attached to both ends or one end of the discharge lamp. And an adhesive filling recess extending in the insertion direction of the discharge lamp, and the adhesive filling recess for fixing the end outer peripheral surface of the discharge lamp also to the lamp holder via an adhesive. Characterized in that it also filled with adhesive parts. The invention according to claim 2 is characterized in that an opening communicating with at least one adhesive filling recess is formed in a side wall of the lamp holder, and the opening is filled with an adhesive. I do. When formed in this way, the area surrounding the discharge lamp of the lamp holder is large, and the discharge lamp is more firmly fixed to the lamp holder.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a configuration of a light source device, FIG. 2 is an explanatory view of a lamp holder viewed from an opening side of a lamp insertion hole, FIG.
FIG. 4 is an explanatory view showing a state in which a discharge lamp is inserted and attached to a lamp insertion hole and an adhesive is pressed into a lamp holder.
FIG. 3 is a perspective view showing a light source device. In these figures,
The lamp holder 1 is made of insulating rubber, synthetic resin or the like, and is formed in a semi-cylindrical shape with a bottom surface 2, side walls 3 and opposing end surfaces 4, 5. 6, an adhesive filling recess 7, and an adhesive injection hole 8 opened in the other end surface 5. Lamp insertion hole 6
Is formed to be about 0.02 to 0.8 mm larger than the outer diameter of the end of the discharge lamp 9 to be inserted and attached. The discharge lamp 9 may have any shape such as a straight tube shape, a U shape, and a W shape. The adhesive filling recess 7 is formed by recessing the hole wall of the lamp insertion hole 6 into a semi-cylindrical long groove shape. That is, the adhesive filling recess 7 is
It is spaced apart from the hole wall of the lamp insertion hole 6 in parallel with a predetermined distance in the circumferential direction, and extends along the insertion direction of the discharge lamp 9. The other end wall of the lamp holder 1 is provided with an adhesive injection hole 8 that penetrates substantially the center of the outer end face 10 of the lamp insertion hole in the horizontal direction.

The end of the discharge lamp 9 is inserted into the lamp insertion hole 6 through the opening of the lamp insertion hole 6 of the lamp holder 1, and the discharge lamp 9 is arranged at a desired position on the lamp holder 1.
As shown in FIG. 4, the opening of the adhesive injection hole 8 provided on the other end surface 5 of the lamp holder 1 and the injection hole of the injection tool 12 are made to coincide with each other, and then the adhesive 11 in the injection tool 12 is replaced with the adhesive injection hole. 8, the adhesive 11 is fed into the adhesive filling recess 7 through the adhesive injection hole 8, the gap between the end face of the discharge lamp 9 and the outer end face 10 of the lamp insertion hole, and the adhesive filling recess. 7 and the adhesive injection hole 8 are filled with the adhesive 11, and close the opening of the adhesive injection hole 8 provided on the other end surface 5. Adhesive 1
1 is preferably made of a material having electrical insulation and fluidity. For example, a silicone resin is used. The injection tool 12 uses, for example, a syringe. Since the adhesive injection hole 8 is opened substantially at the center of the outer end face 10 of the lamp insertion hole, the injection tool 1 is provided.
The adhesive 11 pressed into the adhesive injection hole 8 from 2 is filled into the adhesive injection hole 8, the gap between the outer end face 10 of the lamp insertion hole and the end face of the discharge lamp 9, and the adhesive filling recess 7. The discharge lamp 9 is firmly fixed to the lamp holder 1 at four locations with an adhesive.

The embodiment shown in FIGS. 6 and 7 will be described. The only difference from the embodiment shown in FIGS. 1 to 5 is that the adhesive filling recess 7 has a long groove shape with a circular arc cross section. In this way, when the opening area of the adhesive filling recess 7 into the lamp insertion hole 6 is significantly larger than the hole wall area of the lamp insertion hole 6 for positioning the discharge lamp 9, The bonding area with the adhesive 11 is increased, and the discharge lamp 9 is mounted on the lamp holder 1.
Thus, it is more firmly fixed.

The embodiment shown in FIGS. 8 to 11 will be described. One end face 4 of the adhesive filling recess 7 provided corresponding to the side wall 3 of the lamp holder 1 is connected to the other end face 5.
The opening 13 is formed by notching in the direction of. The length of the opening 13 in the lamp insertion direction is shorter than the end position of the discharge lamp 9 when the discharge lamp 9 is inserted into and attached to the lamp holder 1. Even if the opening 13 is provided in the adhesive filling recess 7, the fact that the peripheral surface of the discharge lamp 9 is surrounded by the groove bottom of each adhesive filling recess 7, means that the discharge lamp 9 is mounted on the lamp holder. 1 because it is necessary to fix it at a predetermined position. As shown in FIG. 11, the opening 13 is filled with an adhesive 11 and bonded to the discharge lamp 9, and the discharge lamp 9 is fixed to the lamp holder 1. Other configurations are the same as those of the embodiment shown in FIGS. 6 and 7 described above.

The embodiment shown in FIGS. 12 and 13 will be described. The opening 14 is provided at the outer end face 1 of the lamp insertion hole.
It is formed in a long hole cut out along the lamp insertion direction up to 0. Other configurations are the same as those of the embodiment shown in FIGS.

[0010]

According to the present invention, the discharge lamp can be fixed to the lamp holder by the adhesive while the position of the discharge lamp is stable with respect to the lamp holder. Further, since the discharge lamp is fixed to the lamp holder by bonding the peripheral surface and the end surface of the discharge lamp to the lamp holder with an adhesive, there is an effect that the bonding area is larger than that of the conventional product, and the fixing can be performed more firmly. In addition, since the adhesive can be filled between the peripheral surface of the discharge lamp and the inner surface of the lamp holder by press-fitting the adhesive from the opening on the other end surface of the lamp holder, the production efficiency is improved and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a configuration of a light source device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a lamp holder as viewed from an opening side of a lamp insertion hole.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an explanatory diagram showing a state in which a discharge lamp is inserted and attached to a lamp insertion hole and an adhesive is pressed into a lamp holder.

FIG. 5 is a perspective view showing a light source device.

FIG. 6 is an explanatory view of a lamp holder of a light source device according to another embodiment, as viewed from an opening side of a lamp insertion hole.

FIG. 7 is an explanatory view showing a state where a discharge lamp is inserted into the lamp holder of FIG. 6 and filled with an adhesive.

FIG. 8 is an explanatory diagram of a lamp holder of a light source device according to another embodiment as viewed from an opening side of a lamp insertion hole.

FIG. 9 is a right side view of FIG.

FIG. 10 is a sectional view taken along line BB of FIG. 9;

FIG. 11 is an explanatory diagram showing a state where a discharge lamp is inserted into a lamp holder and filled with an adhesive.

FIG. 12 is a side view of a lamp holder of a light source device according to still another embodiment.

FIG. 13 is an explanatory view showing a state where a discharge lamp is inserted into a lamp holder and filled with an adhesive.

FIG. 14 is an explanatory view of a lamp holder of a conventional light source device viewed from an opening side of a lamp insertion hole.

FIG. 15 is an explanatory view showing a state where the discharge lamp is fixed to the lamp holder shown in FIG. 12 with an adhesive.

FIG. 16 is an explanatory view of a lamp holder of another conventional light source device viewed from an opening side of a lamp insertion hole.

17 is a right side view showing a state where the discharge lamp is inserted into the lamp holder of FIG. 14 and fixed with an adhesive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp holder 3 Side wall 4 One end face 5 Other end face 6 Lamp insertion hole 7 Adhesive filling recess 8 Adhesive injection hole 9 Discharge lamp 10 Outer end face of lamp insertion hole 11 Adhesive 13, 14 Opening

Claims (2)

[Claims] A lamp insertion hole formed in one end of the lamp holder and an adhesive injection hole which communicates with the lamp insertion hole and has a smaller diameter than the lamp insertion hole formed in the other end of the lamp holder; Insert the end of the discharge lamp into the lamp insertion hole, fill the gap between the end surface of the discharge lamp and the outer end surface of the lamp insertion hole and the adhesive injection hole with an adhesive, and insert the adhesive into both ends or one end of the discharge lamp. In a light source device to which a lamp holder is attached, the hole wall of the lamp insertion hole is provided with an adhesive filling recess extending in the circumferential direction and extending in the direction in which the discharge lamp is inserted, and the outer peripheral surface of the discharge lamp end portion is provided. The light source device, wherein the adhesive filling recess is also filled with an adhesive so as to be fixedly attached to the lamp holder via an adhesive. 2. The lamp holder according to claim 1, wherein an opening communicating with the at least one adhesive filling recess is formed in a side wall of the lamp holder, and the opening is filled with an adhesive. Light source device.