JPH0546208Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a one-sided sealed flash discharge tube in which both the positive and negative main electrodes are sealed at one end of the envelope, and particularly relates to an auxiliary member for attaching it to the device in which it is used. This invention relates to a single-side sealed flash discharge tube.

BACKGROUND ART Conventionally, flash discharge tubes that use light emitted by discharge as a light source have been known in various shapes, such as rod-like and spiral shapes. There is Utility Model Application Publication No. 62-20454, which was previously proposed by the applicant.

FIGS. 3a and 3b are a sectional view and a reduced perspective view showing an embodiment of the one-sided sealed flash discharge tube disclosed in the above proposal.

As is clear from FIGS. 3a and 3b, the one-sided sealed flash discharge tube in the above proposal has an anode 2 attached to the open end 1b of a transparent cylindrical envelope 1 whose one end is an open end 1b. , a discharge tube in which a cathode 3 and a base 5 that airtightly maintains a dividing body 4 that divides the interior of the cylindrical envelope 1 into a plurality of spaces 1c and 1d are hermetically sealed;
It has a mounting recess 7 into which the end of the base 5 of the discharge tube is fitted, a cylindrical terminal 8 into which the anode 2 and cathode 3 are fitted and which are crimped and fixed, for example, as shown by A in the figure; It is comprised of a frame 6 on which a trigger electrode 9 is mounted, which is in electrical contact with a transparent trigger electrode 1a provided on the outer surface of the enclosure 1.

That is, each of the components indicated by reference numerals 6 to 9 is electrically and mechanically connected to the single-sided sealed flash discharge tube indicated by reference numerals 1 to 5, and serves as an auxiliary installation member that simplifies its use. Needless to say.

Since the one-side sealed flash discharge tube shown in the above-mentioned proposal is configured with the mounting auxiliary member as described above, when considering the mounting work to the mounting part of the circuit board, etc., the anode 2 which is the main electrode , a cylindrical terminal 8 electrically connected to the cathode 3 and a trigger electrode 1a.
By protruding from the frame body 6 in the same direction as the trigger terminal 9 electrically connected to the trigger terminal 9, for example, a terminal hole may simply be provided on the circuit board and each terminal 8,
The installation work can be carried out simply by inserting 9.

In other words, the terminal can be treated as a single electrical component by simply inserting the terminal into the terminal hole, soldering, etc., that is, it can be used easily.

Problems to be solved by the invention The above-mentioned one-sided sealed flash discharge tube simplifies the installation process, and the configuration of the installation part can naturally be simplified. This may cause such inconvenience.

It is well known that when using a flash discharge tube sealed on one side, that is, when emitting light, it is necessary to apply a high voltage to the trigger electrode 1a via the trigger terminal 9.
On the other hand, the biggest feature of the single-sided sealed flash discharge tube itself is:
The shape can be made smaller.

If the characteristics of the single-sided sealed flash discharge tube are utilized to make its shape more compact, the main electrodes 2 and 3 and the trigger terminal 9 will inevitably become closer together, meaning that the electrical separation distance will become shorter. As a result, there is a possibility that an undesired discharge will occur between the main electrodes 2, 3 and the trigger terminal 9.

If such an undesired discharge occurs, a normal trigger operation cannot be expected and a serious problem arises in that the discharge tube does not emit light.

The present invention was developed in consideration of the above points, and is a one-sided sealed flash discharge that prevents undesired discharge from easily occurring between the main electrode and the trigger terminal even when miniaturized. The purpose is to provide pipes.

Means for Solving the Problems The one-sided sealed flash discharge tube according to the present invention is a single-sided sealed type flash discharge tube in which both positive and negative electrodes are hermetically held at one end of an envelope on which a trigger electrode is formed on the outer surface. a discharge tube, a trigger terminal electrically connected to the trigger electrode, a mounting recess which has an inner diameter approximately equal to the outer diameter of the electrode-sealed end of the discharge tube, and into which this end is mounted; - Consists of a frame body having an insertion hole through which the cathode and trigger terminal are inserted, and a discharge prevention wall that increases the electrical separation distance between at least the anode/cathode and the trigger terminal.

Function Since the flash discharge tube sealed on one side according to the present invention is constructed as described above, its installation work is easy as it can be treated as one electronic component including the frame etc., as in the previous proposal. By using the discharge prevention wall, it is possible to increase the electrical distance between the trigger terminal and the positive and negative electrodes in the installed state.

Therefore, even if the shape is made smaller, undesired discharge between the trigger terminal and the anode and cathode can be prevented.

Embodiment FIGS. 1a, b, and c are perspective views showing an embodiment of the flash discharge tube sealed on one side according to the present invention, and
These are a cross-sectional view and a side view taken along the X′ line, and the third
The same reference numerals as those in the figures indicate the same functional members.

As is clear from FIGS. 1a, b, and c, the one-sided sealed flash discharge tube according to the present invention has an outer enclosure in which a transparent trigger electrode 1a is formed on the outer surface and one end is an open end 1b. A dividing part 13a that divides the inside of the envelope 1 into a plurality of spaces 1c and 1d.
and a base 13b that is hermetically sealed with a sealing member 14 so that the anode 2 and cathode 3 are located at both ends of the spaces 1c and 1d, and the side surfaces of the divided portion 13a and the base 13b are the sides of the envelope 1. A one-side sealed flash discharge tube consisting of a base 13 hermetically sealed to the inner surface, a trigger terminal 15 electrically connected to the trigger electrode 1a, and a positive electrode of the envelope 1.
A mounting recess 10a having an inner diameter approximately equal to the outer diameter of the cathode sealing side end, and insertion holes 10b, 10c, 10 through which the anode 2, cathode 3, and trigger terminal 15 are inserted.
The frame body 10 is provided with a frame 10 having a diameter d.

The frame 10 further includes the anode 2, the cathode 3,
first and second discharge prevention walls 11 for increasing the electrical separation distance between the trigger terminals 15;
It has 12.

As mentioned above, the inner diameter of the mounting recess 10a is
The outer diameter of the base 13b of the sealed portion is approximately equal to the outer diameter of the sealed portion of the base 13b of the discharge tube and the trigger terminal 15.
Needless to say, the mounting work of the above-mentioned mounting recess 10a is a crimping work, but in this embodiment, a heat-resistant adhesive member 16 is further inserted between the mounting recess 10a, the envelope 1, the base 13b, and the trigger terminal 15. This provides a stronger and more stable attachment.

Further, the shapes of the first and second discharge prevention walls 11 and 12 can be designed in terms of height, width, etc., taking into consideration the structure of the mounting part to which the one-side sealed flash discharge tube according to the present invention is mounted. Needless to say. still,
In this embodiment, the first and second discharge prevention walls 1
1 and 12 are set to be smaller than the outer diameter of the frame 10, thereby forming a stepped portion 10e.

Now, let us consider how to attach the flash discharge tube sealed on one side according to the present invention as described above to the equipment in which it is used.

FIG. 2 is a side view showing an example in which the embodiment shown in FIG. 1 is directly fixed to a circuit board 17, for example.

As is clear from FIG. 2, the substrate 17
is provided with a discharge tube mounting hole 17a, through which the one side sealed flash discharge tube shown in FIG. 1 is attached to the substrate 1.
It is installed on 7. At this time, the step portion 10e comes into contact with one surface of the substrate 17, and the mounting operation can be performed stably and easily.

The cathode 3, trigger terminal 15, etc. are directly fixed to the substrate 17 with solder 18, for example, as shown.

On the other hand, the electric distance between the cathodes 3 and the like is such that the discharge prevention walls 11 and 12 are not provided because the height of the discharge prevention walls 11 and 12 is higher than the thickness of the substrate 17 which is the mounting member. As a result, the trigger terminal 15
Undesired discharge between the anode 2 or the cathode 3 is prevented.

Although the embodiment shown in FIG. 1 is provided with two discharge prevention walls 11 and 12, a first and a second discharge prevention wall,
Considering only the prevention of undesired discharge, since the relationship that may cause undesired discharge is between the trigger terminal 15 and the main electrode, it is unlikely that the first discharge prevention wall 11 alone can be expected to have sufficient effect. There is no need to elaborate.

That is, the second discharge prevention wall 12 functions particularly effectively in terms of short circuits between the main electrodes due to contamination of foreign matter, safety standards, etc. when a one-side sealed flash discharge tube is extremely miniaturized and used in alternating current. .

Effects of the invention In the one-side sealed flash discharge tube of the invention, the one-sided sealed discharge tube is attached to a frame body into which the main electrode and the trigger terminal are inserted, and the electrical distance between the main electrode and the trigger terminal is It is provided with a discharge prevention wall that increases the discharge prevention wall, and has the effect of preventing undesired discharge between the two.

This effect can also be expected to make better use of the small size, which is a characteristic of single-sided sealed flash discharge tubes.

[Brief explanation of the drawing]

Figures 1a, b, and c are a perspective view, a cross-sectional view taken along the line 1 is a side view showing the embodiment shown in FIG. 1 attached to a circuit board, and FIGS. 3a and 3b are a cross-sectional view and a reduced perspective view, respectively, showing an example of a conventional single-sided sealed flash discharge tube. 1... Envelope, 2... Anode, 3... Cathode, 1a
...Trigger electrode, 10...Frame body, 11, 12...
... Discharge prevention wall, 13 ... Base, 14 ... Sealing member, 15 ... Trigger terminal, 16 ... Heat-resistant adhesive member, 10a ... Mounting recess, 10b, 10c, 1
0d...Insertion hole.

Claims (1)

[Scope of utility model registration request] A one-side sealed flash discharge tube having an anode and a cathode hermetically held at one end of an envelope having a trigger electrode formed on the outer surface thereof, a trigger terminal electrically connected to the trigger electrode, and the flash discharge tube. It has a mounting recess which has an inner diameter substantially equal to the outer diameter of the electrode sealed end of the discharge tube, into which the end is mounted, and an insertion hole into which the anode, cathode, and trigger terminal are inserted, and at least the anode. and a frame with a discharge prevention wall that increases the electrical distance between the cathode and the trigger terminal.