JPH0821451B2 - Lighting equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device, and more particularly, to a lighting device including a double-ended incandescent lamp and a socket for electrically connecting and holding the incandescent lamp. It is a thing.

Configuration of Conventional Example and Problems Thereof Conventionally, this type of illumination device has been used as a slit exposure light source device of an electronic copying machine or the like, and has a configuration as shown in FIG. That is, such a lighting device has a base 6 in which a filament 2 is provided in a straight tube-shaped bulb 1 and terminals 5 having a spherical concave surface 4 as a contact surface are provided in both ends of the bulb 1 in a cylindrical insulator tube 3. In order to electrically connect and support the double-ended incandescent light bulb 7 having a socket, the arc-shaped tip of the contact 9 of the socket 8 is pressed against the spherical concave surface 4 of the terminal 5 (first (See Figure 5). The contact 9 is made of a spring-like conductive material such as phosphor bronze. Ten
Is a member made of thermosetting resin.

By the way, in the double-ended incandescent lamp 7, the filament 2 is deviated from the valve axis or the center axis of the contactor in assembly. In the optical system of the slit exposure light source device of the electronic copying machine, adjustment at the time of mounting is performed in order to eliminate the nonuniformity of the illuminance distribution due to such deviation. However, there is a problem in that the incandescent light bulb after installation is apt to undergo axial rotation due to vibration during handling, transportation and use, and its light distribution characteristics are likely to change.

Therefore, some measures to prevent the rotation of the incandescent light bulb have already been proposed. That is, the flat sealing portion 11 of the valve 1 in contact with the backing plate 12 (FIGS. 6A and 6B) and the insulator tube 13 of the mouthpiece 13 are provided with a plurality of notches 14 on the outer side surface thereof, and the tip is provided separately from the socket. A member having a protrusion on its part (not shown)
Is provided and a projection is fitted in the notch (FIG. 7). Further, there is one in which a substantially keyhole-shaped hole 16 is provided in the side plate 15, and the flat sealing portion 11 of the valve 1 is fitted into the protrusion of this hole (FIGS. 8A and 8B).

However, although these lighting devices can stop the rotation of the double-ended incandescent lamp, the former two need to add another member, which not only increases the cost but also complicates the structure, Becomes larger. Furthermore, this is problematic in that the rotation angle of the incandescent light bulb cannot be adjusted except at a predetermined position of 90 degrees or 180 degrees, and the adjustment range is narrow, which makes adjustment difficult.

As a result of various studies, the inventor has found that the rotation of the double-ended incandescent light bulb can be reliably stopped without adding a separate member, and the degree of freedom of the adjustment range can be increased.

OBJECT OF THE INVENTION The present invention has a simple structure, and the contact surface of the incandescent light bulb rotates axially due to vibration without changing the structure of the double-incandescent light bulb having a base with a terminal having a spherical concave surface. It is possible to prevent the light distribution characteristic from changing, and it is possible to securely hold it at a predetermined angle, and it also has excellent centripetal returning force, which makes it possible to avoid increasing the size of the device. It is an object of the present invention to provide a lighting device that has a large degree of freedom in the adjustment range of the rotation angle of the incandescent light bulb and that can be easily adjusted at low cost.

According to the present invention, there is provided a double-ended incandescent lamp having a filament inside a straight tubular bulb, and a bulb having terminals having spherical concave contact surfaces at both ends thereof, and a W-shaped tip. And a socket having a contactor having a contact portion formed in a circular shape, and a spherical concave surface of the base has two contact portions of the contactor.
The lighting device is characterized by holding the double-ended incandescent lamp by pressing points together.

Description of Embodiments An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the illuminating device according to the embodiment of the present invention includes a double-ended incandescent lamp 7 and a socket 18. The double-ended incandescent light bulb 7 is no different from the conventional one. That is, a bulb 1 made of quartz glass has a filament 2 and both ends of the bulb 1, that is, a flat sealing portion,
A cylindrical insulator tube 3 having a terminal 5 whose contact surface is a spherical concave surface 4 inside is fixed with an adhesive (not shown) and an R7S type base 6 is provided. A halogen gas is enclosed in the bulb 1 together with a rare gas. Terminal 5 is nickel,
Made of material such as silver. The socket 18 has a contact 19 made of a spring conductive material such as phosphor bronze fixed to a member 10 made of a thermosetting resin. This contact 19
One end side of the is bent into an L-shape, and its tip is formed into a W-shape as shown in FIG.
Dots are formed. As shown in FIG. 3, the tip has a plate thickness of 0.5 to 0.8 mm, a width W of 3 mm, a peak height h of 1 mm, and a peak-to-peak distance 1 of 1.0 to 1.8 mm. The two pointed tips of the contactor 19 are in contact with the spherical concave surface 4 of the terminal 5.

As in the above configuration, the socket is formed on the spherical concave surface 4 of the terminal 5.
Since the two contact tips 19 of 18 are pressed against each other, the resistance against axial rotation becomes extremely strong. Therefore, even if vibration is applied, the double-ended incandescent light bulb 7 is prevented from rotating, and Good electrical connection can be made.

By the way, in the above configuration, the double-ended incandescent light bulb 7
If the hand accidentally touches the incandescent bulb during assembly or handling after it is aligned with the center axis or if a strong shock is applied to it, the position will shift and It was expected that the resistance force for returning to the predetermined position would be considerably larger than that of the conventional device, which would cause a problem in practical use. However, when the double-ended incandescent lamp is deviated, it is confirmed that it can be easily returned to its original position by rotating it around the axis of the incandescent lamp (hereinafter referred to as centripetal return), It was confirmed that there is no fear of the above, and it can be put to practical use.

EFFECTS OF THE INVENTION As described above, the present invention provides a filament in a straight tubular bulb, and a double-ended incandescent light bulb provided with a base having terminals with spherical concave contact surfaces at both ends of the bulb. A socket having a contact having a W-shaped tip and holding the double-ended incandescent light bulb by pressing two points of the tip of the contact onto the spherical concave surface of the base. Allows the incandescent light bulb to rotate axially due to vibration without changing the structure of the double-incandescent incandescent light bulb having a base with a terminal whose contact surface is a spherical concave surface without adding any special member. It is possible to prevent the characteristics from changing, it can be held securely at a predetermined angle, and it also has an excellent centripetal return force, a simple configuration, and it is possible to avoid increasing the size of the device. , And even the same incandescent bulb It is possible to provide an illuminating device that has a large degree of freedom in the adjustment range of the turning angle and that can be easily adjusted at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an illuminating device according to an embodiment of the present invention, FIG. 2 is a partially cutaway enlarged sectional view of the same, FIG. 3 is a front view showing an example of a contact, and FIG. FIG. 5 is a partially cutaway enlarged cross-sectional view showing an example of the lighting device of FIG. 6, FIGS. 6A and 6B are perspective views and cross-sectional views showing another example of the conventional lighting device, and FIG. FIG. 8 is a partial perspective view of an incandescent lamp used in a conventional lighting device of another example, and FIGS. 8A and 8B are a perspective view of a main part and a partial plan view of a side plate of the conventional device. 1 ... Valve, 2 ... Filament, 4 ... Spherical concave surface,
5: Terminal, 6: Base, 7: Double-ended incandescent lamp, 18
…… Socket, 19 …… Contact.

Claims (1)

[Claims] 1. A double-ended incandescent lamp in which a filament is provided inside a straight tube-shaped bulb, and a base having a terminal whose contact surface is a spherical concave surface is provided at both ends of the bulb, and a W-shaped tip. And a socket having a contact formed in
Illumination characterized in that the spherical concave surface of the base is pressed into contact with the two points of the tip of the contactor to electrically connect the double base incandescent bulb and hold the double base incandescent bulb. apparatus.