JPS61227343A - Display element - Google Patents

Abstract

PURPOSE:To excellently prevent a fall of optical output while holding the coolest part temperature within the proper range by forming one of a pair of the tube tip housing parts of a base in a size allowing loose fitting of the tube tip parts of a fluorescent lamp to be housed into said housing part while forming a through hole connected to a receptacle and opened to the rear side of the base. CONSTITUTION:A display element A, for example, is mounted on a display device B while having its projection part 2 on the front side for forming a display screen and cooled by a blast of a fan from the rear side of the display device B. Thereby, a wind flows into a receptacle 1 from a through hole 13 of one housing part 10 provided on a base 9 for cooling a fluorescent lamp 4 while being discharged from a ventilation hole 16. Since the through hole 13 is formed in the size allowing loose fitting of the tube tip 6 of the fluorescent lamp 4, a cooling wind directly hits the whole periphery of the one tube tip 6 for excellently cooling the tube tip 6. Thereby, the coolest part temperature of the tube tip 6 of the fluorescent lamp 4 is held within the most proper range thus making it possible to stably light and properly display.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a display element suitable for use in electronic display devices, displays, etc. [Prior art] Electric display devices that display letters and graphics outdoors, guide displays,
It has been proposed to use fluorescent lamps, which consume relatively little power and have relatively high brightness, as display elements used in displays and the like. However, conventional lamps using light lamps as display elements, for example,
In the device described in Japanese Patent No. 3343, a straight tube fluorescent lamp is bent into a U-shape, and this bent portion is used as a light emitting display portion. However, the light output of a fluorescent lamp is closely related to the temperature of the coldest part on the surface of the lamp pulp, and when the temperature of the coldest part is in the range of about 0°C to about 60°C, the display surface brightness is high and the light is emitted. It is known that efficiency is improved. Therefore, if the display device is installed outdoors. When the display element disclosed in the above-mentioned Japanese Utility Model Publication No. 48-23343 is exposed to the outside air, the surface temperature of the bulb may fall below the appropriate range, resulting in a decrease in light output and instability. For this reason, a transparent front cover is included. It houses a fluorescent lamp bent in a KU-shape, and has ventilation openings in the envelope and cap to maintain the temperature of the coldest part of the lamp bulb surface within an appropriate range for high display brightness. Various display elements have been proposed that are capable of achieving 5KL. For example, as seen in Japanese Patent Application No. 59-136356, a fluorescent lamp bent in a U-shape is housed in a container with a light projection part on the front, and connection terminals are connected to the electrodes of the fluorescent lamp. It has been proposed that a container is provided with a cap that protrudes and has a through hole formed on the back surface that communicates with both tube ends of the fluorescent lamp. [Problems to be Solved by the Invention] When this device is installed, for example, in an electronic display panel, air is blown from the back side of the electronic display panel to cool the display element, and the inside of the container is ventilated. It has been confirmed that the bulb surface of the Kanai Hikari lamp can be maintained within an appropriate range to some extent. Since this ventilates a part of each of the ends of the U-shaped light lamp, when using a U-shaped light lamp with a relatively large gap between the two ends, the surface temperature of the lamp bulb increases. It is possible to maintain the display surface brightness within a high appropriate range. However, in recent years, there has been a demand for downsizing of display elements using this type of fluorescent lamp, and for example, in a device using a small U-shaped fluorescent lamp of about 4W, the distance between the two ends of the tubes is small;
With the above-described configuration, there is a risk that the bulb surface temperature of the light lamp cannot be maintained within an appropriate range where the display surface brightness is high, and an improvement is desired. [Means for solving the problems] The present invention has been made in consideration of the above-mentioned circumstances. To provide a display element capable of maintaining the temperature of the coldest part of a fluorescent lamp within an appropriate range by blowing liquid air around the entire circumference of one tube end of a U-shaped fluorescent lamp disposed in a container. With the goal. In the present invention, a fluorescent lamp bent in a U-shape is housed in a container having a light projecting part on the front surface, with the bent part facing the light projecting part, and both tube ends of this curved light lamp are respectively stored. In a case where a pair of housing parts is formed and a base with a protruding connection terminal connected to the electrode of the light lamp is disposed on the back side of the container, one of the pair of housing parts of one base is placed in this housing part. It is characterized by being formed in a size that allows the end portion of the tube to be accommodated to fit loosely therein, and a through hole that opens on the back side of the cap and communicates with the container. In the present invention, when one cap is attached to a socket of a display device and the one display device is cooled by air blowing from the back side of the display device, the light lamp is turned on by the air flowing in from the tube end storage section consisting of the through hole of the one cap. One end of the tube is directly cooled over its entire circumference, which further cools the tube body of the fluorescent lamp. The temperature of the coldest part at the end of the lamp tube can be maintained within an appropriate range, and the brightness of the display screen can be maintained satisfactorily. In the present invention, the container may be made of any material, but for example, it may be made of a cylindrical body made of non-transparent synthetic resin, and a focusing lens made of a convex lens is disposed on the front surface to form a light projecting part. It can be configured as follows. Alternatively, the container may be made of metal, such as aluminum, and a focusing lens may be provided on the front surface to form a light projecting portion. Furthermore, the container can be made of synthetic resin with a light projecting section consisting of a focusing lens section integrally formed on the front surface. In addition, the fluorescent lamp uses a straight tube shaped light lamp, with the middle part bent into a U-shape. The bent portion is formed as a light emitting display portion. In addition, one cap is formed to close the opening on the back side of the container, and accommodates both tube ends of the fluorescent lamp. In addition to forming a pair of housing parts for storing the lamps, connecting terminals for connecting to the electrodes of the light lamps are provided protrudingly. One side of the tube end storage section of the zero cap is formed to a size that allows the tube end to fit loosely into it, and is formed with a through hole that communicates with the container.

[There is. Furthermore, the light lamp may form a light film that emits light of red, green, blue, etc., and may also be heated to emit a desired color by itself, or may form a light film that is white. However, the outer surface may be painted in color. In this way, it can be used as a color display element. Further, the light projecting portion may be formed of a light-transmitting cover having the same color as the emission color of the fluorescent lamp. Furthermore, the container may be formed of a cylindrical body with a flat cross section. 〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings. 1
The container 1 is made of, for example, non-transparent synthetic resin and has a light projecting portion 2 on the front surface and is formed into a cylindrical shape with a flat cross section. In this dormitory embodiment, the light projecting section 2 is formed by a convex lens disposed in the front opening 3 of the container 1. Also, condition 1
The inner and outer surfaces may be black. Reference numeral 4 denotes a fluorescent lamp, and this fluorescent lamp 4 has a phosphor film formed on the inner surface of a transparent tube 5 made of, for example, a glass bulb.
．． A single discharge path 21 is formed by filling mercury at 006 mHH and argon gas at a pressure of several mmHg. The ends 6, 6 are provided with electrodes 7.7 and sealed. Then, this fluorescent lamp 4 is formed into a U-shape by bending the middle part, and this bent part is used as a light emitting display part 8, and this light emitting display part 8 is made to face the light projecting part 2 and attached to the container 1. It is stored. 9 is the base. This base 9 forms a pair of housing parts 10.11 for housing the tube ends 6, 6 of the fluorescent lamp 4, and also has a connecting terminal 12 connected to the electrode 7.7 of the fluorescent lamp 4.
．． 12 is provided protrudingly on the back side of the container 1. One of the pair of storage parts 10 and 11 of the cap 9 is formed to have a size such that the tube end 6 to be stored in the storage part 10 fits loosely therein, and the back surface of the cap 9 is It is formed with a through hole 13 that opens on the side and communicates with the container IK. Further, the other housing section 11 of the two caps 9 is formed of a recessed portion in which the tube end portion 6 can be accommodated. And, the fluorescent lamp 4 has a housing part consisting of a through hole 13 in one of both tube ends 6, 6] OK. The other side is housed in a housing section 11K formed by a recess, and the tube end 6 is attached with adhesive 14 in the other housing section 11.
is firmly attached. At this time, the tube end 6 stored in one of the storage sections 10K formed by the through hole 13 is suspended in the air because the through hole 13 is formed in a size that allows the tube end 6 to fit loosely. A vent hole 15 is formed around the entire circumference of the tube end 6. Reference numeral 16 denotes a ventilation hole provided in the vicinity of the light projecting portion 2 of the container 1, and reference numeral 17 represents a mounting portion provided on the outer surface of the container 1. As shown in FIG. 7, for example, the display element A configured as described above is formed by layering the display device BK with the light projecting section 2 facing the front side to form a display surface. Next, the operation of this embodiment will be explained. The display element A is cooled by air blowing from the back side of the display device B by a fan (not shown). At that time, the wind flows into the container 1 from the through hole 13 of one of the storage parts 10 provided in the cap 9,
The fluorescent lamp 4 is cooled and discharged from the ventilation hole 16. The second through hole 13 is formed in a size that allows the tube end 6 of the fluorescent lamp 4 to fit loosely therein, so the cooling air directly hits the entire circumference of one tube end 6, and the tube end 6 is well-fitted. is cooled to Therefore, the temperature of the coldest part of the tube end 6 of the fluorescent lamp 4 is maintained within the optimum range even when the ambient temperature changes, allowing stable lighting and proper display. According to the inventor's experiments, even if a 4W U-shaped light lamp is used, it is difficult to control the wind speed.
The temperature of the coldest part of the optical lamp 4 could be maintained within 40°C to 60°C. [Effects of the Invention] According to the present invention, one of the tube end storage portions of a pair of nine caps is formed in a size such that the tube end of a fluorescent lamp to be stored in this storage portion can be loosely fitted, and the cap is Since it is formed with a through hole that opens on the back side and communicates with the container, one tube end of the Kanai Hikari lamp can be directly cooled around the entire circumference, so the temperature of the coldest part of the tube end can be maintained within the appropriate range, and the light A decrease in output can be effectively prevented.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an enlarged cross-sectional view of the display element, Fig. 2 is an enlarged longitudinal sectional view, Fig. 3 is a front view of the display element, and Fig. 4 is a rear view of the display element. , FIG. 5 is a side view, FIG. 6 is a bottom view, and FIG. 7 is a front view of a portion of the display device with a display element attached thereto. 1...Container, 2...Light projection part. 5.5... Translucent tube body, 8... Light emitting display section. 4... Fluorescent lamp, 9... Base 1
0.11... Storage department, 12.12...
····Connecting terminal. 13...Through hole

Claims (1)

[Claims] (1) The middle part of a cylindrical container with a light projecting part on the front and a translucent tube with electrodes at both ends forming a discharge path is bent, and this bent part is used as a light emitting display part. A fluorescent lamp is housed in the container with the light-emitting display section facing the light projecting section, and a pair of storage sections is formed to respectively accommodate both tube ends of the fluorescent lamp. a cap with a protruding connection terminal connected to the electrode of the container and disposed on the back side of the container; 1. A display element characterized in that the display element is formed with a through hole that is sized to fit loosely and that opens on the back side of the cap and communicates with the container.