JP2543525Y2 - Discharge lamp device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp device for easily replacing a discharge lamp.

[0002]

2. Description of the Related Art There are various types of discharge lamps such as mercury lamps, metal halide lamps, sodium lamps, xenon lamps, and in particular, high-pressure mercury lamps, metal halide lamps,
A high-pressure sodium lamp or the like is called a high-intensity discharge lamp (HID lamp). High-intensity discharge lamps are small, have high output,
It has features of high efficiency and long life, and is used as a light source for overhead projectors and stage lighting in theaters. These discharge lamps must be handled with care due to the high applied voltage at the start of lighting and considerable heat generation during lighting. Technicians had gone.

[0003]

[0005] By the way, in consideration of the fact that such a discharge lamp needs to be replaced in general in many cases, it is easy for anyone to replace the discharge lamp on the spot. It is desirable to be able to do it. However, the structure of the conventional discharge lamp or its mounting portion is based on the premise that a specialized engineer performs the replacement work as described above, and has a structure that is difficult for ordinary users to work. Especially in equipment that uses a discharge lamp together with an optical system for illumination, such as an overhead projector, if the discharge lamp is mounted eccentrically with respect to the optical system, the lighting efficiency may decrease or illumination unevenness may occur. The replacement and adjustment work was troublesome.

The present invention has been made in consideration of the above-mentioned problems of the prior art, and an object of the present invention is to provide a discharge lamp device which can easily be replaced.

[0005]

In order to achieve the above object, the present invention provides a discharge lamp having conductive screw rods projecting at both ends, and a plastic bracket member fixed to one of the screw rods. , Attached to the tip of each screw rod,
A pair of socket members to which the plug of the main device is mounted,
A first member in which the bracket member is fixed to the main body device by using a coil spring inserted from the other of the screw rods, the distal end side of which is engaged with the outer periphery of the discharge lamp, and the rear end side of which is wider than the outer diameter of the screw rod.
By attaching to the holding member and holding one end side of the discharge lamp, dropping the other screw rod into the insertion groove of the second holding member fixed to the main device, and receiving the rear end side of the coil spring by the second member. The other end of the discharge lamp is elastically held.

[0006]

The discharge lamp is replaced with a first holding member and a second holding member on the main body side, a bracket member attached to one end of the main body, a socket fitting fixed to a threaded rod at both ends, a coil spring, and the like. May be removed as a replacement unit, and a new replacement unit may be attached to the first and second holding members. When a new replacement unit is mounted, a positioning action is performed between the bracket member and the first holding member, and an elastic holding action by a coil spring can be used on the second holding member side on the other end side. It does not require such skill.

[0007]

FIG. 2 is a cross-sectional view of a main part of a transmission type overhead projector incorporating the discharge lamp device of the present invention. An openable and closable lamp house cover 3 is provided on the bottom surface of the projector main body 2, and a pair of frames 4 and 5 are fixed to the inner surface thereof. For example, both ends of a discharge lamp 6 composed of a metal halide lamp are held by frames 4 and 5, and are connected to a power supply circuit 8 via sockets 7a and 7b. The center of the discharge lamp 6 is spherical, and the light emitted from this portion reaches the stage glass 11 via the condenser lens 9 and the Fresnel lens sheet 10 for condensing, and the transparent original placed on the stage glass 11 is Illuminate from the side.
Thus, the image of the document is projected on the screen by the projection unit 12. Reference numeral 13 denotes a mirror that reflects light emitted downward from the discharge lamp 6 toward the stage glass 11.

As shown in FIG. 1, a tapered tubular portion extends to both sides from the spherical portion of the discharge lamp 6, and conductive screw rods 15a and 15b protrude from the respective ends.
A bracket 16 formed by molding heat-resistant plastic is fixed to one of the screw rods 15a in a state where the bracket 16 is sandwiched between a pair of nuts 17. The other screw rod 15b
A trapezoidal coil spring 18 is inserted through the side. Since the inner diameter of the distal end of the coil spring 18 is smaller than the outer diameter of the intermediate portion of the tubular portion of the discharge lamp 6, the distal end of the coil spring 18 does not reach the spherical portion of the discharge lamp 6 as shown in the figure. Stopped in the department. The rear end side of the coil spring 18 enters the sleeve 5b formed in the frame 5 and has a shape wider than the width of the notch 5a.
Has been reached. Further, the screw rod 15a,
15b, socket fittings 19a, 19b
Is screwed. In FIG. 1, the illustration of the mirror 13 is omitted to avoid complication of the drawing.

The bracket 16 is provided with a hole in the center thereof through which the screw rod 15a is inserted, a ridge 16a on a side surface, a pair of holding pieces 16b projecting leftward in the drawing, and a projection projecting toward the discharge lamp 6 side. Protection plate 16c is integrally formed. Then, the bracket 16 is positioned on the frame 4 by the projection 16a entering the groove 4a formed in the receiving portion of the frame 4. The frame 4 is screwed to the lamp house cover 3 via the elongated hole 4b, so that the fixing position of the frame 4 with respect to the lamp house cover 3 can be adjusted. As described above, the screw rod 15a of the discharge lamp 6 is fixed to the bracket 16 by the pair of nuts 17, and the bracket 16 is positioned by the frame 4. By adjusting the fixing position of the frame 4 in advance, It can be set so that the spherical portion of the discharge lamp 6 is located directly below the center of the stage glass 11. The screw rod 15b is fitted into the notch 5a of the other frame 5. Although the width of the notch 5a is larger than the diameter of the screw rod 15b, the right end side of the coil spring 18 in the drawing is wider than the notch 5a as described above.
Is elastically held by the coil spring 18 and the frame 5.

The sockets 7a and 7b connected to the lead wires from the power supply circuit 8 are socket fittings 19a and 19b, respectively.
b. FIG. 3 shows the socket 7b and the socket fitting 1.
9b shows a cross section in a state of connection with the socket 9b, and this structure is common to the other socket side. Socket 7b
Is comprised of a cylindrical insulator 20 made of cement, a contact tube 22 fixed therein by screws 21, and a contact fitting 23 to which a lead wire is soldered. The contact tube 22 has elasticity, and the socket fitting 19 fitted therein.
The electrical connection is made in close contact with the outer periphery of b. Further, the insulator 20 is formed with a stepped portion 20a, and the socket 7b can be pulled out from the socket fitting 19b by pinching the insulator 20 and pulling it to the right.

When the discharge lamp 6 burns out due to its service life during use of the overhead projector and is to be replaced with a new one, the projector main body 2 is turned over as shown in FIG. After loosening the screw 25, the lamp house cover 3 is opened. When the lamp house cover 3 is opened, the frames 4 and 5 and the discharge lamp 6 held by the frames 4 and 5 come out of the projector main body 2. Then, the insulators 20 of the sockets 7a and 7b are pinched and pulled, so that the sockets 7a and 7b are
9a and 19b.

After the sockets 7a and 7b are removed, the bracket 16 is pulled out from the frame 4. When performing this operation, the holding piece 1 formed integrally with the bracket 16 is required.
6b may be picked up and lifted. The screw rod 15 a of the discharge lamp 6 is fixed to the bracket 16 by a nut 17.
Since the other screw rod 15b is only pressed against the frame 5 by the coil spring 18, the discharge lamp 6 can be easily connected to the frame 4 together with the bracket 16 as described above.
5 can be removed. According to this detaching operation, it is not necessary to directly touch the discharge lamp 6 with a hand, so that it is not necessary to wait until the discharge lamp 6 is completely cooled.

Thereafter, a new replacement unit 30 enclosed by a broken line in FIG. The replacement unit 30 includes a discharge lamp 6, a bracket 16 fixed at predetermined positions on a screw rod 15a with nuts 17, 17, and a socket 19 screwed to ends of the screw rods 15a, 15b.
a, 19b and a coil spring 18. When attaching the replacement unit 30 to the frames 4 and 5, the holding piece 16b of the bracket 16 is grasped,
The screw rod 15 b is fitted into the notch 5 a of the frame 5, and the ridge 16 a of the bracket 16 is dropped into the groove 4 a of the frame 4 while pressing and deforming the coil spring 18 against the frame 5. Since the bracket 16 is fixed at a predetermined position according to the size of the discharge lamp 6 in advance, the spherical portion of the discharge lamp 6 is positioned just below the condenser lens 9 simply by mounting the replacement unit 30 as described above. Thus, efficient illumination can be given to the stage glass 11. Thus, the new replacement unit 30 is connected to the frames 4 and 5
After that, the socket fittings 19 at both ends of the discharge lamp 6 are mounted.
The power supply circuit 8 and the discharge lamp 6 may be electrically connected by pushing the sockets 7a and 7b over the sockets 7a and 19b and pushing them. The protective plate 16c provided on the bracket 16 and the sleeve 5b formed integrally with the frame 5 are provided with a screw rod 15
This is effective for preventing high-pressure leaks from a and 15b from flying to the chassis portion of the projector main body 2. Although the illustrated embodiment has been described above, the present invention can be used not only for a transmission type overhead projector but also for various devices using a discharge lamp as a light source.

[0014]

As described above, according to the discharge lamp device of the present invention, a positioning bracket member is fixed to one screw rod of the discharge lamp, and a coil spring is inserted into the other screw rod. A bracket member is attached to the first holding member fixed to the main body device to hold one end of the discharge lamp, and the second holding member of the main body device elastically holds the other end side of the discharge lamp by a coil spring. With this configuration, anyone can easily replace the discharge lamp without any skill, and can always position the discharge lamp at a position that provides efficient illumination.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of the discharge lamp device of the present invention.

FIG. 2 is a cross-sectional view of a main part of the overhead projector shown in FIG.

FIG. 3 is a sectional view of a main part showing a structure of a socket part of the discharge lamp device of the present invention.

[Explanation of symbols]

 3 Lamp house cover 4, 5 Frame 6 Discharge lamp 7a, 7b Socket 15 Screw rod 16 Bracket 18 Coil spring 19a, 19b Socket fitting 30 Replacement unit

Claims (1)

(57) [Scope of request for utility model registration] 1. A discharge lamp having conductive screw rods projecting at both ends, a plastic bracket member fixed to a predetermined position of the screw rod, and a socket of a main body device attached to a tip of each screw rod. And a coil spring inserted from the other of the screw rods, the tip end side of which is engaged with the outer periphery of the discharge lamp, and the rear end side of which is wider than the outer diameter of the screw rod. It is attached to a first holding member fixed to the device, holds one end of the discharge lamp, and the other screw rod is dropped into an insertion groove of a second holding member fixed to the main device, and the rear end of the coil spring is set to a second position. A discharge lamp device characterized in that the other end of the discharge lamp is elastically held by pressing against two members.