JPH081525U - Noble gas discharge lamp - Google Patents

Abstract

(57) Abstract: A rare gas discharge lamp in which a terminal can be easily led out from the end of an external electrode and which does not damage the envelope when soldering a lead wire to the terminal. To provide. SOLUTION: An envelope 1 having a light emitting layer 2 on the inner surface and containing a rare gas in an inner space, and a strip-like shape formed on the outer surface of the envelope 1 so as to be separated along the axial direction thereof. Strip-shaped terminals 5A, 6A derived from the first and second external electrodes 3, 4 and at least one end of the first, second external electrodes 3, 4 so as to have an electrical connection relationship. And the widths of the terminals 5A and 6A are set smaller than the widths of the external electrodes 3 and 4, and the terminals 5A and 6A are superposed on the end portions of the external electrodes 3 and 4 to prevent troubles during assembly. It can be resolved.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a rare gas discharge lamp, and more particularly to an improvement in a structure for leading a terminal from an external electrode in a rare gas discharge lamp having a pair of external electrodes on the outer surface of an envelope.

[0002]

[Prior art]

 In general, the document irradiating device is configured to irradiate, for example, the light emitted from a discharge lamp onto the document surface, and the reflected light from the document surface is received by a linear sensor including a CCD element (charge coupled device). .

As a discharge lamp applied to this device, electrodes are arranged at both ends of a glass bulb having a light emitting layer made of a phosphor on the inner wall, and a predetermined amount of mercury and argon gas are enclosed in the inner space of the glass bulb. Since the light emitting layer is excited by the excitation line of mercury (mainly 253.7 nm) during operation, the illumination on the document surface can be increased.

However, although this discharge lamp can obtain excellent light output characteristics in the steady state as described above, it takes a long time from the lighting to the steady state. This is because it takes a relatively long time for the mercury vapor in the glass bulb to reach a stable state, and the light output is not stable during this time.

By the way, in the document irradiation device, since the document is read simultaneously with the operation of the device, it is immediately turned on according to the operating condition of the device, and the light amount thereof is equal to or more than a predetermined light amount in an extremely short time. It is required to reach up to about 100%, but the above-mentioned discharge lamp using mercury-argon gas has an insufficient illuminance at the beginning of lighting, so that the reading accuracy is significantly impaired.

Moreover, when the mercury vapor pressure in the glass bulb fluctuates with changes in ambient temperature, the light output also fluctuates. For this reason, if the temperature of the part where the document irradiation device is installed changes, the illuminance of the document surface also fluctuates greatly with the change in the light output of the discharge lamp, and the reading accuracy of the document is impaired. Be done.

[0007]

[Problems to be solved by the device]

 Therefore, the applicant has previously proposed the rare gas discharge lamp A shown in FIGS. In the figure, reference numeral 1 is an envelope made of, for example, lead glass or ceramics, and a light emitting layer 2 made of a phosphor is formed on the inner surface thereof. In particular, on the inner surface of the envelope 1, a light projection window (aperture portion) 2a in which the light emitting layer 2 is not formed is formed over substantially the entire length thereof. A rare gas containing xenon gas as a main component is sealed in the inner space of the envelope 1. On the outer surface of the envelope 1, a pair of strip-shaped external electrodes 3 and 4 are arranged so as to be separated from each other over substantially the entire length thereof, and the light projection window 2 a is not substantially closed. There is. The external electrodes 3 and 4 are made of a non-translucent metal member having excellent conductivity such as aluminum foil, and the end portions 3a and 4b thereof are respectively the end faces 1a of the envelope 1. , 1b to form terminals 5 and 6. Lead wires 7 and 8 for external lead-out are soldered to the terminals 5 and 6. Furthermore, a protective layer 9 made of, for example, a heat-shrinkable resin is attached to the outer surface of the envelope 1 so as to cover the external electrodes 3 and 4.

In the rare gas discharge lamp A configured as described above, a high frequency high voltage having a frequency of 20 to 100 KHz and a voltage of 1 to 2 KV is applied to the external electrodes 3 and 4 through the terminals 5 and 6, respectively. A discharge is generated in the rare gas. Then, the emitted light due to the excitation of the light emitting layer 2 is densified and projected to the outside through the light projection window 2a.

By the way, according to the discharge lamp A, since the mercury is not enclosed in the envelope, the light amount reaches about 100% almost at the same time as the lighting. Therefore, since the document is read at the same time as the operation of the document irradiation device, the operation efficiency of the device can be improved. Moreover, since the fluctuation of the light output is small even if the ambient temperature changes, it is possible to always maintain high-quality reading accuracy.

However, since the terminals 5 and 6 are arranged along the end surfaces 1a and 1b of the envelope 1, when the lead wires 7 and 8 are soldered, the outer surfaces of the end surfaces 1a and 1b are removed. Cracks due to thermal shock occur in the enclosure, and the function as a rare gas discharge lamp cannot be achieved. Particularly, when aluminum is used for the external electrodes 3 and 4, for soldering the lead wires 7 and 8, it is necessary to use a dedicated solder having a melting point higher than that of general solder. There is a problem that cracks are more likely to occur and the yield rate is reduced.

Therefore, an object of the present invention is to provide a rare gas that can easily lead the terminal out from the end of the external electrode and does not damage the envelope when the lead wire is soldered to the terminal. It is to provide a discharge lamp.

[0012]

[Means for Solving the Problems]

 Therefore, in order to achieve the above-mentioned object, the present invention provides an envelope having a light-emitting layer on the inner surface and enclosing a rare gas in the inner space, and an outer surface of the envelope in the axial direction. The strip-shaped first and second external electrodes formed separately along the strip-shaped strip-shaped external electrode that is electrically connected from at least one end of the first and second external electrodes. A terminal is provided so that the width of the terminal is set smaller than the width of the external electrode, and the terminal is superposed on the end portion of the outer electrode. The second invention of the present invention is the above-mentioned terminal. In the third invention, a protective layer is formed on the outer surface of the envelope so that the outer electrode is covered with the protective layer. It is characterized by having done.

[0013]

[Embodiment of device]

 Next, one embodiment of the present invention will be described with reference to FIGS. The same parts as those of the prior art shown in FIGS. 4 to 5 are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, the characteristic part of this embodiment is that the strip-shaped terminals 5A and 6A are overlapped and electrically connected to the end portions of the external electrodes 3 and 4, and the widths of the terminals 5A and 6A are set to the external electrodes 3 and 4. That is, it is set smaller than the width of 4. The terminals 5A and 6A and the external electrodes 3 and 4 are electrically connected by appropriate connecting means such as soldering, ultrasonic welding, caulking, and conductive adhesive. Particularly, the tip portions of the terminals 5A and 6A led out from the end portions of the external electrodes 3 and 4 are configured to be separated from the end face 1a of the envelope 1, and the lead wires for leading out to this portion are provided. 7 and 8 are soldered.

Another feature is that a protective layer 9 is provided on the outer peripheral surface of the envelope 1 so as to cover the external electrodes 3 and 4. The protective layer 9 is composed of, for example, a translucent heat-shrinkable insulating tube, a glass bulb, a ceramic bulb, or the like. In particular, when a heat-shrinkable insulating tube is used as the protective layer 9, it is attached to the envelope 1 by heating after being attached to the envelope 1.

According to this embodiment, since the strip-shaped terminals 5A and 6A having a width smaller than the width of the external electrodes 3 and 4 are overlapped at the end portions of the external electrodes 3 and 4, they are connected to each other. In addition, the final form can be made undesirably large and can be reliably incorporated into OA devices such as miniaturized image scanners and fax machines.

Particularly, when aluminum is used for the external electrodes 3 and 4 and copper is used for the terminals 5A and 6A, a high frequency high voltage having a frequency of 25 KHz and a voltage of 1 to 2 KV is applied to the external electrodes 3 and 4, for example. Due to this, due to long-term use, corrosion of dissimilar metals will occur at the connection between the two, and eventually the electrical connection between the two will be impaired. As described above, the width of terminals 5A and 6A Is smaller than the width of the external electrodes 3 and 4, so that the occurrence of corrosion can be suppressed.

Further, since the tip portions of the terminals 5A and 6A led out from the end portions of the external electrodes 3 and 4 are configured to be separated from the end surface 1a of the envelope 1, the external conductors are tentatively connected to these portions. Even if the lead wires 7 and 8 for output are soldered, the end face 1a of the envelope can be completely prevented from being damaged by thermal shock. Therefore, the yield rate can be significantly improved.

Further, since the protective layer 9 is provided on the outer peripheral surface of the envelope 1 so as to cover the external electrodes 3 and 4, it is assumed that the space for incorporating the rare gas discharge lamp in the OA device is provisionally provided. The insulation between external electrodes and the insulation between external electrodes and OA equipment can be maintained sufficiently high even when the temperature is narrow or used in a humid environment.

Further, the external electrodes 3 and 4 are made of an extremely thin metal such as aluminum tape, and are weak in strength, but the protective layer 9 is not provided on the outer peripheral portion thereof. Therefore, even if an external force acts on the external electrodes 3 and 4 through the protective layer 9, they are not damaged at all. Therefore, when the device is installed in an OA device, damage caused by contact of the external electrode with the device can be ignored, so that the work can be performed efficiently.

The present invention is not limited to the above-mentioned embodiment at all, and for example, the aperture part of the light emitting layer is omitted, or a light reflecting layer having an aperture part is laminated on the light emitting layer. Can also be formed. Further, the protective layer can be formed by spraying a glass material. Furthermore, the terminals can be led out from both ends of the envelope.

[0021]

[Effect of device]

 As described above, according to the present invention, the ends of the external electrodes are overlapped with the strip-shaped terminals each having a width smaller than the width of the external electrodes, so that they can be easily connected to each other. In addition, the final form is not undesirably enlarged, and it can be reliably incorporated into OA devices such as miniaturized image scanners and fax machines.

Particularly, when aluminum is used for the external electrode and copper is used for the terminal, due to the high frequency high voltage being applied to the external electrode, corrosion of the dissimilar metal occurs on the connection between the two due to long-term use. However, the electrical connection between the two is impaired, but since the width of the terminal is set smaller than the width of the external electrode as described above, the occurrence of corrosion can be suppressed.

Further, since the tip end portion of the terminal led out from the end portion of the external electrode is configured to be separated from the end surface of the envelope, a lead wire for external leadout is provisionally provided in this portion. Even if soldered, the end face of the envelope can be completely prevented from damage due to thermal shock, and the yield rate can be significantly improved.

Further, if a protective layer is provided on the outer peripheral surface of the envelope so as to cover the external electrodes, it is assumed that the space for incorporating the rare gas discharge lamp into the OA device is narrow or the environment is humid. Even when used, the insulation between the external electrodes and the insulation between the external electrodes and the OA equipment can be maintained sufficiently high.

Further, the external electrode is made of a thin metal and is weak in strength. However, since the protective layer is provided on the outer peripheral portion of the external electrode, the external electrode is externally provided via the protective layer. Even if an external force is applied to the electrode, it is not damaged at all. Therefore, when the device is installed in an OA device or the like, the damage caused by the contact of the external electrode arrangement portion with the device can be ignored, and the work can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

3 is a cutaway side view of the main part of FIG.

FIG. 4 is a longitudinal sectional view of the prior art.

5 is a cross-sectional view taken along line YY of FIG.

[Explanation of symbols]

 1 Envelope 1a, 1b End face 2 Light emitting layer 2a Light projection window 3,4 External electrode 5A, 6A Terminal 7,8 Lead wire

Claims (3)

[Scope of utility model registration request] 1. An envelope having a light emitting layer on its inner surface and containing a rare gas in its inner space, and a strip-shaped first envelope formed on the outer surface of the envelope along the axial direction thereof. 1, a second external electrode, and strip-shaped terminals led out from at least one end of the first and second external electrodes so as to have an electrical connection relationship, and the width of the terminal is external. A rare gas discharge lamp characterized in that the width is set smaller than the width of the electrodes, and the terminals are superposed on the ends of the external electrodes. 2. The rare gas discharge lamp according to claim 1, wherein a lead-out end of the terminal from the external electrode is separated from an end face of the envelope. 3. A protective layer is formed on the outer surface of the envelope so as to cover the external electrodes.
The rare gas discharge lamp described.