JP3348323B2 - Discharge lamps and lighting devices - 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 mounted on a reading device or a backlight device used for OA equipment such as a facsimile, an electronic copier, a personal computer, a word processor, and a display device such as a television, or a lighting fixture. The present invention relates to a discharge lamp used in the above and a lighting device such as the above-described display device or lighting device equipped with the lamp.

[0002]

2. Description of the Related Art There is a fluorescent lamp as a discharge lamp having excellent luminous efficiency and a long service life in place of an incandescent lamp. In this fluorescent lamp, an electrode (hot cathode) composed of a filament coil in which a tungsten wire is wound twice or three times is provided at both ends of a glass bulb having a phosphor film coated on an inner surface thereof. Is filled with an inert gas such as argon gas for facilitating electric discharge and an appropriate amount of mercury.

When the filament coil is preheated by passing an electric current through the electrode (hot cathode), thermoelectrons are emitted from the filament coil into the bulb, and the thermoelectrons are attracted by the high pressure of the opposite electrode and move, so that both electrons move. Discharge starts between the electrodes. The electrons moving by the discharge collide with mercury atoms in the bulb and emit ultraviolet rays, which excite the phosphor applied on the inner surface of the bulb and emit visible light outside the bulb. For this light emission, various emission colors such as white, daylight, blue, and pink are obtained depending on the type of the phosphor.

In recent years, this fluorescent lamp is used not only for illumination mounted on lighting equipment and the like, but also for OA such as facsimile, reading light source and exposure light source of an electronic copier, personal computer, word processor and the like.
It is widely used as a backlight light source for display devices such as devices and televisions.

[0005] For example, as colorization and miniaturization of high brightness of personal computers and televisions are promoted,
Similarly, fluorescent lamps used in backlight devices are required to have a smaller diameter, smaller size, lower power consumption, higher luminance, higher color rendering, and longer life than fluorescent lamps for ordinary lighting. ing. In particular, since these devices are for consumer use, lamp replacement is not performed in principle, and a life of 10,000 hours or more is required.

For this reason, a compact fluorescent lamp for a backlight device has been designed to be optimal from the viewpoint of life as well as the current and voltage, the type of rare gas to be enclosed and the amount of mercury, so as to be suitable for low power consumption. I have.

As one means for reducing the size of a straight tube type fluorescent lamp, there is a type in which a base is not attached to a tube end. By making the baseless, it is possible to shorten the entire lamp length not only by the base part but also by the socket in which the base is mounted. Conversely, if the lamp length is the same as the conventional one, the effective light emission length can be increased, and the efficiency of the lamp can be increased.

Therefore, recently, when a plurality of fluorescent lamps having hot cathode type electrodes, for example, two to six fluorescent lamps having a hot cathode type electrode are mounted and arranged in parallel for a large backlight, the lamp is not provided with a base at an end. In addition, a wire harness system is often used in which a power supply line is directly connected to an external lead wire derived from each lamp, and the plurality of power supply lines are sequentially aligned and connected to terminal pieces.

However, when a large number of lamps are mounted, the convergence of power supply lines becomes complicated when a power supply line directly connected to an external lead wire is routed in an OA device or the like. In addition, the power supply line must be accommodated in a narrow space around the equipment,
At this time, an undesired tensile stress is applied to the external lead wire, and sometimes the external lead wire is caught on the exhaust pipe, and when the pipe is forcibly removed, the exhaust pipe is broken and the lamp leaks, The tip portion at the end of the exhaust pipe protruding from the opening of the stem tube is likely to come into contact with another object, and the tip portion may be chipped, causing a leak. In addition, there is another problem that the external lead wires that are not insulated from each other in the stem tube are in contact with each other and short-circuited, causing the lamp to become inconsistent.

[0010]

In order to solve such a problem, it is known to fill the stem tube with a silicone resin adhesive or the like to prevent the external lead wires from contacting each other. . However, even if a silicone resin adhesive is injected into a tube with a small inside diameter,
The adhesive did not reach the base of the exhaust pipe due to the viscosity and the difficulty in escaping the gas in the tube, so that the adhesive could be filled only near the opening of the stem tube. Also,
If you spend a lot of time in injecting this silicone resin adhesive, there is nothing you can do, but it takes a lot of work time and productivity is not good, and the adhesive pulls the thread and the injection workplace is extremely dirty and it takes time and effort to maintain Was required. In addition, the one filled with a silicone resin adhesive or the like in the vicinity of the opening of the stem tube in this way has an effect of preventing contact between the external leads, but when the external lead is pulled, the exhaust pipe is closed. When stress is applied in contact with the vicinity of the root, the exhaust pipe may be broken. Also, due to the tip-off operation, the tip of the exhaust pipe that protrudes from the opening of the stem tube is not covered with adhesive, and if something comes into contact with this tip, the tip will Leaks were sometimes generated due to chipping.

The present invention has been made in view of the above problems,
In a wire harness system in which a power supply line is directly connected to an external lead wire, an object of the present invention is to provide a discharge lamp that does not cause contact between external lead wires and breakage of an exhaust pipe, and a lighting device equipped with the lamp.

[0012]

DISCLOSURE OF THE INVENTION The discharge lamp of the present invention comprises:
A straight tubular glass bulb, a flare stem sealed at both ends of the bulb, and a hot cathode connected to at least two lead wires provided on the flare stem; enclosed in the glass bulb A discharge maintaining medium;
An elastic holder having an accommodating portion which is elastically inserted into the stem tube and penetrates the plurality of lead wires with an insulating partition interposed therebetween is provided.

A straight tubular glass bulb, a flare stem sealed at both ends of the bulb, a hot cathode connected to an exhaust pipe provided on the flare stem and at least two lead wires, A discharge sustaining medium sealed in the glass bulb, and an elastic holder provided with a receiving portion which is elastically inserted and inserted into the stem tube and through which the exhaust pipe and the plurality of leads are inserted through an insulating partition. Are provided.

Further, the elastic holder is characterized in that a locking portion for supporting a lamp is formed at a base end portion.

Further, the lead wire accommodating portion of the elastic holder is a through hole or a notch.

Further, the lighting device of the present invention is characterized in that the discharge lamp described above is mounted on an appliance or a lamp.

[0017]

According to the present invention, the outer lead wires and the exhaust pipe do not contact each other or the exhaust pipe.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a partially cutaway perspective view showing a state in which a plurality of discharge lamps used in a backlight device and the like are arranged, FIG. 2 is a front sectional view in which an end portion including a stem portion of the fluorescent lamp in FIG. FIG. 3 is a perspective view of an elastic holder mounted in a stem tube in FIG. 2.

This discharge lamp is, for example, a straight tube-type fluorescent lamp L. This lamp L has an outer diameter of about 8 mm and an inner diameter of about 6 mm.
mm, a tubular glass bulb 1 made of soda lime glass having a total length of about 300 mm.
Is sealed with a stem 3 having a flare portion 3b.

On the inner wall surface of the valve 1, for example, blue,
A three-wavelength phosphor film 4 is formed by mixing phosphors having emission regions of green and red, and mercury and a rare gas such as argon (Ar) or neon (Ne) are used as a discharge maintaining medium inside the bulb 1. It is enclosed alone or as a mixture.

The stems 3 sealed at both ends of the bulb 1 (both ends are the same and will be described with reference to one) are lead glass as shown in FIGS. Alternatively, a pair of lead wires 5, 5 and an exhaust pipe 31 are crushed and sealed at one end and a flare portion 3b formed at the other end is sealed with the opening of the glass bulb 1 at one end. Thus, the sealing portion 2 is formed.

The above-mentioned lead wire 5 is composed of a sealing wire 5a made of a dumet wire or the like, and a heat coil consisting of a filament coil connected to one end of the sealing wire 5a and having a tungsten wire wound double or triple inside the bulb 1. It comprises an internal lead wire 5b connected to the cathode 6, and an external lead wire 5c connected to the other end of the sealing wire 5a and connected to the power supply wire 7 outside the bulb 1. The sealing wire 5a made of a dumet wire having the same coefficient of thermal expansion as that of the glass of the stem 3 is hermetically sealed by the crush sealing portion 3a of the stem 3.

Further, the crushed sealing portion 3a is separated from the flare
A substantially cylindrical elastic holder 8 made of a heat-resistant member such as silicone rubber is elastically inserted into the stem tube 3c up to b. The elastic holder 8 has a main body 8a whose outer diameter is substantially the same as the inner diameter of the stem tube 3c, and has an exhaust pipe insertion hole 83 (as shown in FIG. 3) into which the exhaust pipe 31 of the stem 3 is loosely inserted. Instead of a through hole, a bottomed hole may be used.) On the outside of the exhaust pipe insertion hole 83, a pair of lead wire insertion holes 85 for passing the external lead wires 5c, 5c are formed. In addition, 8b is a chamfered part which made the front-end | tip part the inclined surface shape. Reference numeral 7a denotes an insulating coating provided around the power supply line 7.

In the manufacture of the above-mentioned fluorescent lamp L, the flare portion 3b of the stem 3 having the hot electrodes 6 at both ends of the glass bulb 1 having the phosphor film 4 formed on the inner surface is sealed. Next, when the inside of the valve 1 is evacuated through the exhaust pipe 31 and an inert gas and mercury are enclosed, the exhaust pipe 31 is chipped off to obtain a wire valve.

Next, a pair of lead wire insertion holes 85 and 85 and an exhaust pipe insertion hole 83 of the elastic holder 8 are aligned with the distal ends of the external lead wires 5c and 5c and the exhaust pipe 31, respectively. The elastic holder 8 is mounted in the stem tube 3c by pushing the take-in portion 8a into the stem tube 3c from the open flare portion 3b. The external lead wires 5c and 5c and the exhaust pipe 31 are located in the lead wire insertion holes 85 and 85 and the exhaust pipe insertion hole 83, respectively.

Thereafter, the power supply line 7 is connected to the distal ends of the external lead wires 5c and 5c, and the exposed conductor near the connection is covered with an insulating coating 7a to complete the lamp L.

As shown in FIG. 1, the lamp L is composed of a plurality of lamps L to Ln as a set, and is used by being mounted on a backlight device (not shown). At this time, the power supply lines 7, 7,... Derived from the lamps L to Ln are routed for wiring in the apparatus, and even if stress is applied to the lead wire 5, the connection with the exhaust pipe 31 and other lead wires 5 may occur. It is possible to provide a wire harness system that is free from entanglement and free from trouble.

The fluorescent lamps L to Ln having such a configuration are
When connected to a predetermined high-frequency lighting circuit and energized, a discharge is generated between the electrodes 6 composed of a hot cathode, and the electrons moving in the bulb 1 collide with mercury atoms to emit ultraviolet light due to the discharge. The phosphor film 4 on the inner surface of the bulb 1 receives and excites and emits predetermined visible light outside the bulb 1 to emit light.

In this lamp L, the exhaust pipe 31 and the external lead wires 5c, 5c in the stem tube 3c are located in the respective exhaust pipe insertion holes 83 and the lead wire insertion holes 85, 85 of the elastic holder 8, Even when a stress such as the external lead wires 5c, 5c being pulled directly or indirectly through the power supply line 7 is applied when the lamp L is installed, the stress is not given to the exhaust pipe 31 and each external Since the lead wires 5c and 5c are inserted through the separate lead wire insertion holes 85, they do not come into contact with each other and short-circuit. Further, the holder 8 is elastically held in the stem tube 3c and does not require a special adhesive or the like.

Therefore, the power supply line (wire harness)
It is possible to provide a fluorescent lamp having a long life, such that breakage from the root of the exhaust pipe 31 and breakage of the chip portion can be prevented at the time of routing and there is no occurrence of leaks, and a short circuit between the external lead wires 5c and 5c can be prevented. . In addition, exhaust pipe 3
After one tip-off, it is only necessary to simply insert the elastic holder 8 into the stem tube 3c, so that it is simple and requires no skill.
In this mounting, if the chamfered portion 8b is formed as shown in the figure, it is easy to insert.

FIGS. 4A and 4B show another embodiment of the elastic holder according to the present invention. In FIG. 4A and FIG. Omitted. The elastic holder 8 shown in FIG. 5A has a pair of lead wire insertion grooves 86, 86 opened on the outer surface of the main body 8a.

In the elastic holder 8 shown in FIG. 3B, the side wall of the main body 8a is cut off and a partition wall 87 for isolating the lead wire is provided at the center.
Is formed. In the figure, the outer diameter of the lower body portion 8a and the width of the partition 87 are substantially the same as the inner diameter of the stem tube 3c, and the holder 8 inserted into the stem tube 3c crosses the external lead wires 5c, 5c at the partition 87 portion. There is nothing to do.

The elastic holder 8 of FIG. 4 is the same as that of the embodiment of FIG. 3 except that the configuration of the lead wire accommodating portion is different, and the operation and effect are the same.

FIG. 5 shows another embodiment of the elastic holder of the present invention. In FIG. 5, the same parts as those in FIGS. 2 to 4 are denoted by the same reference numerals, and the description thereof will be omitted. The elastic holder 8 shown in FIG. 5 is provided with a closing portion 8c having a diameter larger than that of the main body portion 8a adjacent to the main body portion 8a. The sealing portion 2 is protected when receiving the same. In addition, this closing part 8c
May be provided, for example, as shown by a one-dot chain line in FIG. 3, or the main body 8a shown in FIG. 4B may be formed with a larger diameter to have a protective effect.

As shown in FIG. 5, a locking portion 9 for attachment to a backlight or a lighting device may be formed at the base end of the elastic holder 8, and such a locking portion 9 may be formed. The formed lamp does not require special parts, and the lamp L can be easily attached to the apparatus. And the lamp L of the present invention
As shown in FIG. 6, the light source is mounted on a reflector R as a light source, combined with a light diffusing plate D and a display plate P, and used as a backlight of a liquid crystal display device such as a television or a personal computer to obtain high efficiency and to use the device There is an advantage that it can be miniaturized.

The present invention is not limited to the above embodiment. For example, the discharge lamp is not limited to a fluorescent lamp, and can be applied to other straight tube discharge lamps using a flare stem, such as a lamp using rare gas emission. Further, the application is not limited to display such as a backlight device, but can be applied not only to OA equipment and lighting, but also to lamps for ultraviolet radiation such as sterilization. Further, the number of external lead wires led out from one end of the bulb is not limited to two, but is three in a lamp using an auxiliary electrode.
It may be more than books.

In a discharge lamp using a straight tubular bulb, an exhaust pipe is provided on at least one of the stems for exhausting or filling gas inside the bulb, and no discharge pipe is provided on the other side. Yes, an elastic holder may be inserted into the stem tube on the side not having such an exhaust pipe to prevent the external lead wires from contacting each other.

Further, the material of the elastic holder is not limited to silicon rubber, but may be formed of a rubber having elasticity, such as fluorine rubber or butyl rubber, or a synthetic resin material. In addition, the number of insertion holes and insertion grooves of the external lead wires formed in the elastic holder is not limited to the minimum two required for the hot cathode, and two or more plural ones are provided for use in a lamp having the above-mentioned auxiliary electrode. If a large number of the elastic holders are provided, the external lead wires can be inserted into arbitrary holes and grooves when the elastic holder is mounted on the stem tube. In the case where the insertion groove is formed on the outer surface of the elastic holder, since the outer surface has irregularities, the elastic holder can be held in the stem tube with a higher elastic force, so that there is no extraction. Also, the chamfer at the tip of the holder is not essential.

The material of the bulb is not limited to lead glass, but may be a soft glass such as soda lime glass or a hard glass such as aluminosilicate glass. The glass material of the flare stem may be appropriately adjusted according to the glass material of the bulb to be combined. You can choose.

Further, the means for connecting the external lead wire and the power supply line (wire harness) is not limited to the embodiment.

Further, as the illuminating device according to the present invention, in addition to the above-described display device such as a backlight of a liquid crystal display device, OA equipment such as a facsimile or a copying machine or an exposing device, or general illuminating equipment, lamps or the like. It can be applied to an ultraviolet irradiation device and the like.

In the present invention, both sides of the lead wire insertion hole 85 and the lead wire insertion groove 86 formed in the elastic holder 8 in the above embodiment or the partition wall 87 shown in FIG. Also, the lead wire insertion holes 85 and 85 and the insertion grooves 86 and 8 of the elastic holder 8 are provided.
The main body 8a between the six is a part called a partition separating the lead wires 5c and 5c.

[0043]

As described in detail above, according to the present invention, this lamp has the exhaust pipe and the external lead wire located in the stem tube in the exhaust pipe receiving hole and the lead wire receiving hole of the elastic holder, respectively. Even when stress is applied, such as when the external lead wire is pulled directly or indirectly through the power supply line when the lamp is installed, no stress is applied to the exhaust pipe, and each external lead wire is provided separately. Since the lead wire accommodating holes are inserted, there is no possibility of short circuit due to mutual contact. Further, the holder is held elastically in the stem tube, and is held firmly without requiring any special adhesive or the like.

Therefore, the power supply line (wire harness)
It is possible to provide a discharge lamp having a long service life such that breakage from the root of the exhaust pipe and breakage of the chip portion can be prevented at the time of wiring, and no leak or the like can be caused. In addition, the discharge lamp has various advantages, such as simple installation and no skill is required, since the mounting operation can be performed simply by inserting the elastic holder into the stem tube after the exhaust pipe is chipped off, and a lighting device using this discharge lamp. Can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a discharge lamp of the present invention.

FIG. 2 is an enlarged front sectional view of a main part showing an end including a stem of the lamp of FIG. 1;

FIG. 3 is a perspective view of the elastic holder of the present invention shown in the lamp of FIG. 2;

FIGS. 4A and 4B are perspective views showing another embodiment of the elastic holder of the present invention.

FIG. 5 is a perspective view showing another embodiment of the elastic holder of the present invention.

FIG. 6 is an exploded perspective view showing an embodiment of the backlight device according to the present invention.

[Explanation of symbols]

 L: lamp 1: glass bulb 2: sealing portion 3: flare stem 31: exhaust pipe 3b: flare portion 3c: stem tube 5c: (external) lead wire 6: electrode (hot cathode) 7: power supply wire (wire harness) 8 : Elastic holder 83: Exhaust pipe accommodating part (insertion hole) 85: Lead wire accommodating part (insertion hole) 86: Lead wire accommodating groove (insertion groove) 9: Locking part D: Light diffusion plate P: Display plate R: Reflection mirror

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-343032 (JP, A) JP-A-5-89838 (JP, A) JP-A-7-11747 (JP, U) JP-A 57- 148763 (JP, U) JP-A-59-80959 (JP, U) JP-A 2-39447 (JP, U) JP-A 1-112586 (JP, U) JP-B 40-23829 (JP, B1) J. 45-22553 (JP, Y2) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01J 61/36

Claims (5)

(57) [Claims] 1. A straight tubular glass bulb; flare stems respectively sealed at both ends of the bulb; a hot cathode connected to at least two lead wires provided on the flare stem; A discharge sustaining medium enclosed in the stem tube; and an elastic holder having an accommodating portion inserted elastically into the stem tube and passing the plurality of leads through an insulating partition. And discharge lamp. 2. A straight tubular glass bulb; a flare stem respectively sealed at both ends of the bulb; a hot cathode connected to an exhaust pipe and at least two lead wires provided in the flare stem; A discharge sustaining medium sealed in the glass bulb; and an elastic holder provided with a housing portion elastically inserted and inserted into the stem tube and through which the exhaust pipe and the plurality of lead wires are inserted through an insulating partition. A discharge lamp comprising: 3. The discharge lamp according to claim 1, wherein the elastic holder has a locking portion for supporting a lamp at a base end portion. 4. The discharge lamp according to claim 1, wherein the lead wire accommodating portion of the elastic holder is a through hole or a notch. 5. A lighting device, wherein the discharge lamp according to claim 1 is mounted on an appliance or a lamp.