JPS6079A - Structure of threaded base and socket in tubular bulb unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to the structure of a socket and a cap when a tube having a screw-in cap is screwed into a socket.

[Technical background of the invention and its problems]

BACKGROUND OF THE INVENTION Some types of tubes require that their lighting direction be regulated. For example, a discharge lamp as shown in FIGS. 1 and 2, such as a metal halide lamp, can be cited as an alternative. Conventional metal halide lamps are housed with the axis of the arc tube aligned with the axis of the outer bulb, and when lit vertically, both the outer bulb and the arc tube are vertical, and when lit horizontally, the outer bulb and the arc tube are Both were in a horizontal position.

However, when lit with the arc tube in a horizontal position, there are problems such as the arc inside the arc tube being bent upward due to convection, so using the arc tube in a vertical position is more advantageous in terms of lamp characteristics. However, due to restrictions such as the mounting position of the rung and the mounting height, the outer tube may be required to be in a horizontal position.

Therefore, as shown in FIGS. 1 and 2, the arc tube 2 is placed inside the outer tube 1, and the tube axis of the arc tube is 01-o.

A metal halide lamp has been proposed in which the tube axis is orthogonal to the tube axis 0□-02 of the outer tube. In such a case, by attaching a screw-type cap 3 to one end of the outer tube 2 and screwing the cap 3 into the socket 4, the lamp can be attached to the socket 4 in a hypothetical manner. Connection and mechanical engagement are contemplated.

However, since the screw-in type cap 3 is threadedly engaged with the holder 5 of the socket 4, the rotational position changes depending on the amount of screwing. In particular, when attaching a lamp, the screwing force of the maker varies, resulting in variations in the position of the lamp. Such a change in the rotational position of the lamp, as shown by the imaginary line in Fig. 2, is due to the fact that the arc tube 2 is not in the correct vertical position, causing the arc to become unstable and adversely affecting the lamp characteristics. This results in drawbacks such as variations in light distribution characteristics.

[Purpose of the invention]

The present invention was made based on the above circumstances, and its object is to stop the tube in a fixed position when the tube is screwed into the socket through the screw-type cap. The object of the present invention is to provide a structure of a screw-in type cap and socket in a tube device in which the rotational position is constant.

[Summary of the invention]

In the present invention, a protrusion is formed on the threaded part of the cap, and a notch is provided in the receiver on the socket side, so that when the cap is screwed into the receiver, the protrusion passes through the cutout to a predetermined position. When the protrusion reaches the notch end, it is blocked, and the collision between these protrusions and the notch end regulates the amount of screwing in and the rotational position of the tab, thereby positioning the mounting posture of the tube in a fixed position. shall be.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings from FIG. 3 onwards.

This embodiment is shown in a metal halide lamp similar to that shown in FIGS. 1 and 2, and the same members are given the same numbers and their explanations will be omitted. The base 3 attached to the end of the outer tube 1 has a protrusion 10 at a position close to the opening of the outer tube 11fAIJ.
is formed.

As shown in FIGS. 6 to 8, this protrusion 10 is formed by cutting and raising the thread ridge 1 of the cap 3 outward. The height is almost the same.

Furthermore, an opening 13 is provided on the side surface of the protrusion 10, which is formed by cutting and raising the screw root 1 outward, and which is simultaneously formed by cutting and raising the thread.

The receiver 5 of the socket 4 is housed in a socket body 15 made of a well-known electrical insulator, and has a thread 16 into which the base 3 is screwed. As shown in FIGS. 4 and 5, this receiver 5 has a notch 17 formed therein. One end of the notch 17 is opened at the open end of the receiver 5, and the other end, the notch end 18, is along the axial direction. A portion 1l-1 between the open end and the notched end 18 is cut out along the threaded thread 16. That is, the notch 17 is formed by cutting the side wall of the receiver 5 into a substantially triangular shape.

In the embodiment with such a configuration, when attaching the lamp to the socket 4 via the base 3, the base 3 is screwed into the holder 5. Then, the protrusion 10 enters the notch 17 and eventually comes into contact with the notch end 18. Once the protrusion 10 hits the notched end 18, further screwing is no longer possible. Therefore, the rotation of the lamp relative to the socket 4 is stopped by the collision between the protrusion 10 and the cutout end 18, so that the mounting posture of the arc tube 2 is restricted. If the socket 4 is positioned and installed in advance on the chamber wall 19 or the like so that the luminous tube 2 is in a vertical position, when the lamp is installed in the socket 4, the protrusion 10 and the cutout end 18 are aligned. The blocking action ensures that the arc tube 2 can be stopped at a vertical position.

Note that if the protrusion 10 is formed in the thread valley 11 so that the height of the protrusion 10 is approximately equal to or less than the thread thread 12, the protrusion 10 will not protrude from the outer surface of the cap 3 and will be a hindrance in handling. No.

If the opening 13 is formed at the same time as the protrusion 10 is formed, the opening 13 communicates between the inside and outside of the base 3. In the cap 3, the center terminal 2θ is soldered to a lead wire on the lamp side (not shown), but the temperature inside the cap 3 rises during soldering, and the temperature inside the cap 3 increases accordingly. The air pressure inside also increases. An increase in air pressure will not blow away the molten solder and will cause soldering defects, but if the opening 13 is formed, the air pressure will be released through this opening 13, so the soldering will not be defective. It can be prevented.

It should be noted that the present invention is not limited to the metal halide lamp described above, but can be applied to various types of tubes equipped with screw-type caps, where it is necessary to regulate the lighting posture of the tubes.

Further, in the above embodiment, the protrusion 10 is located at the thread valley 1 of the base 3.
The protrusion 10 is made to protrude from the bottom of the 1 part.
may be provided protrudingly from the midway side surface of the thread root, or may be further provided protrudingly from the thread 12 portion.

〔Effect of the invention〕

As described above, according to the invention 1, when the tube is attached to the socket, the protrusion formed on the base hits the notch end provided on the receiver and stops the rotational position, so that the rotation of the tube with respect to the socket is stopped. The position is positioned in place. Therefore, when it is necessary to regulate the posture in which the tube is used, the posture can be correctly regulated.

[Brief explanation of drawings]

Figures 1 and 2 are for explaining the background art of the present invention. Figure 1 is an explanatory diagram showing the relationship between the metal halide driver/f and the socket, and Figure 2 is shown along the line ■-■ in Figure 1. FIG. Figure 3 and subsequent figures show one embodiment of the present invention, Figure 3 is an explanatory view corresponding to Figure 1, Figure 4 is a side view showing an enlarged base and socket, and Figure 5 is a perspective view of the receiver. 6 is a perspective view of the cap, and FIGS. 7 and 8 are cross-sectional views taken along lines 1--2 and 1--2 in FIG. 6, respectively. 1... Outer tube of metal halide lung, 2... Luminescent tube, 3... Base, 4... Socket, 5... Receiver, 1
0...Protrusion, 11...Thread valley, 17...Notch,
18... Notch end. Applicant's agent Patent attorney Suzue Takehiko γ2 3 (' No. 591 Figure 6 1", 7r!

Claims (2)

[Claims] (1) In a tube device in which a screw-type cap attached to one end of a tube is screwed into a receiver on the socket side for electrical and mechanical connection, the cap is provided with a protrusion on the threaded portion, and A notch is formed in the metal, one end of which is connected to the opening edge and extends approximately in the direction of the cotton wire, and when the cap is screwed into the receiver, the protrusion hits the end of the notch to determine the rotation of the tube. A structure of a screw-in type cap and socket in a tube device, characterized in that it is stopped at a certain position. (2) The structure of a screw-in type cap and socket in a tube device according to claim (1), wherein the protrusion is formed in a trough in a threaded portion of the cap.