JPS6142152Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a digital light-emitting display element for a large watch that can eliminate high-frequency noise and make lighting easier and stable without increasing ambient temperature.

Conventionally, the above type of large digital clock, for example a clock with a character height of 145 mm and a width of 80 mm, has a height of 240 mm.
mm, width 780mm, depth 100mm, and the partition frames used in digital light emitting display elements of such watches are often made of plastic because they are easy to mold and have good insulation properties. However, this has poor heat dissipation, and the heat generated by the incandescent light bulb, which is the light source, causes deformation and discoloration of dials, diffusers, partition plates, etc. However, the blinking display of hours, minutes, and seconds on a clock shortens its lifespan and requires labor and expense for replacement, maintenance, and security.

On the other hand, a cold cathode discharge tube is a light bulb, in which argon gas is sealed in a glass tube, fluorescent paint is applied to the tube wall, electrodes are provided at both ends of the tube, and mercury vapor is sealed in the tube with a mercury getter. Compared to fluorescent lights, it has a lifespan several ten times longer, consumes only a few tenths of the power, and has many features, such as being extremely resistant to blinking and producing any desired color, making it ideal as a light source for large watches. Although it is optimal, it generates high frequency noise when lit,
This causes interference with radios, televisions, etc., and has the drawback that it cannot be put to practical use. In addition, to light up a cold cathode discharge tube, a high frequency oscillation voltage is applied to the electrode from a low DC voltage (for example, 12 V or 6 V), although the voltage is increased to 300 to 400 V at A, C 100 V (commercial frequency 50 Hz or 60 Hz). In this case, noise The generation source is the cold cathode discharge tube when increasing the A and C voltage, and the cold cathode discharge tube and the oscillation transformer when high frequency oscillation lighting is performed.

Therefore, the present invention attempts to provide a digital light-emitting display element for large watches that can eliminate the above-mentioned drawbacks, and its gist is that A cold cathode discharge tube is stored in each of the plurality of storage chambers, and both electrode portions of the cold cathode discharge tube are attached to a printed circuit board that closes the back side of the partition frame, and between the two electrode portions and on the printed circuit board. According to the present invention, by using a partition frame made of non-ferrous metal or metal, high-frequency noise can be eliminated, and the partition frame can also function as a heat dissipation plate. It also serves as a reflector for cold cathode discharge tubes, preventing the ambient temperature from rising and increasing illuminance, resulting in a clear luminescent display.Furthermore, it serves as a nearby conductor for cold cathode discharge tubes, making lighting easier and more stable. It is.

Next, the present invention will be explained in more detail with reference to an embodiment shown in FIGS. 1 to 4.

First, in FIGS. 1 and 2 showing a first embodiment of the present invention, 1 is a partition frame, 2 is a printed circuit board that closes the back side of the partition frame, 3 is a well-known U-shaped cold cathode discharge tube, Reference numeral 4 designates an oscillation transformer located in the leg of the discharge tube, and the partition frame 1 has upper and lower central space chambers 5 and 6 made of, for example, aluminum, and is adjacent to these space chambers. It is formed as a frame with a square cross section and has chambers 7 and 8 in which the cold cathode discharge tube 3 is housed.
Seven cold cathode discharge tubes 3 are housed in the seven storage chambers 7 and 8 to form one character 〓, and in this case, each of the cold cathode discharge tubes is connected to the substrate 2 as shown in FIG. It is attached to the top in a shape arrangement, and is inserted from the back side of the partition frame 1 to form a light emitting element body for one character, and a diffuser plate and a dial plate (not shown) are appropriately attached to the front side of the partition frame. In addition, 9 and 9' are the electrode parts of the cold cathode discharge tube 3, 10 and 10' are the lead wires of the same electrodes, and 1
1 and 11' indicate terminals of the oscillation transformer 4, respectively.

The lighting of the cold cathode discharge tube 3 can be achieved by boosting the commercial frequency to a high voltage or by using a high frequency of 10 to 30 KHz, but while the former has a simple circuit configuration,
The latter is advantageous because it is inferior to the latter in terms of illuminance and lifespan, but high-frequency noise further increases, that is, the noise is generated from the discharge tube and the oscillation transformer. Therefore, as shown in FIG. 2, the oscillation transformer 4 is disposed between the electrode portions 9 and 9' of the cold cathode discharge tube 3, and, for example, the U-shaped cold cathode discharge tube 3 used in a large watch. The distance between the electrode parts 9 and 9' is 40 mm, and the height of the tube is 40 mm.
mm, so the oscillation transformer 4 (height 10 mm, width 7
mm, depth 8 mm) can be disposed in one cold cathode discharge tube 3 (see FIG. 4). Also, 1
If the height of the letters is 90 mm and the width is 54 mm, the distance between the electrode parts 9 and 9' of the U-shaped cold cathode discharge tube 3 is 15 mm (the height of the tube is 40 mm), so the electrode parts are arranged as shown in Figure 2. It cannot be placed between 9 and 9'. Therefore, in such a case, for example, four oscillation transformers 3 are installed in the space 5 and three oscillation transformers 3 are installed in the space 6 in the central spaces 5 and 6 of the partition frame 1 shown in FIG. In this case, the central part 12 of the printed circuit board 2 shown in FIG.
It goes without saying that the oscillation transformer 4 may be disposed in the partition frame 1 so that it can be stored separately in the central spaces 5 and 6 of the partition frame 1.

In addition, noise can be further eliminated by grounding the partition frame 1. In addition to the transformer, each component of the high frequency oscillation circuit is soldered onto the printed circuit board 2. The luminous character should be composed of seven sets of cold cathode discharge tubes 3 and oscillation transformers 4 arranged on a frame 1 and a printed circuit board 2. The cold cathode discharge tubes and oscillation transformers, which are the sources of noise, are both placed in a narrow partition frame. 1, most of the emitted high-frequency noise is absorbed by the aluminum partition frame 1 and eliminated, without causing any trouble to electrical equipment such as televisions and radios. This enabled the practical use of large clocks using discharge tubes.

Conventionally, seven reflectors were attached to the light source of large watches, but the aluminum partition frame of this invention has good light reflectivity, so there is no need to attach them separately, which saves materials and saves materials. It is cheaper because it saves labor, and it also eliminates unevenness of light and makes the light more uniform.
In particular, heat tends to accumulate in the center of each character, causing the ambient temperature to rise.In this case, it was difficult to dissipate heat with plastic partition frames, and deformation and discoloration of the diffuser plate and dial plate were unavoidable. Aluminum partition frames have extremely good heat conduction, so heat can be dissipated from the center of the letters very easily, so not only the center of the letters but also the periphery of the letters are cooled, making them extremely effective as heat sinks. be.

Next, in FIG. 3 showing a second embodiment of the present invention, the same parts as in the first embodiment are given the same reference numerals, and the aluminum partition frame 1 has one space 5.
Vertically long protrusions 14 and 15 are provided oppositely in the vertical direction of the space, which hold the cold cathode discharge tube 3 at the center of the partition frame, and also hold the cold cathode discharge tube 3 in the center of the partition frame. By contacting or coming close to the protrusions 14 and 15, it acts as a proximal conductor for the discharge tube, and the discharge starting voltage can be lowered by about 10 to 20%, thereby extending the life of the discharge tube and at the same time improving the lighting state. It can play a role in maintaining stability.
Further, the vertically long protrusions 14 and 15 are the cold cathode discharge tubes 3.
It is more effective if they are provided along the electrode parts 10, 10', and it is necessary to cut both of these protruding parts obliquely near the diffuser plate so that they do not shade the characters.

Furthermore, when using commercial frequency voltage, one stabilizing resistor is used when applying a boosted secondary voltage (for example, 100 V on the primary side and 350 V on the secondary side) to the cold cathode discharge tube, which reduces noise generation. source cold cathode discharge tube 3
may be housed in an aluminum partition frame 1 as shown in FIGS. 1 to 3.

As described above, according to the present invention, high frequency noise can be eliminated and the following effects can be achieved.

(1) House the cold cathode discharge tube and oscillation transformer, which are the sources of high-frequency noise, in a non-ferrous metal or metal partition frame to eliminate the noise to a few tenths of what it would otherwise cause to other electronic equipment. Never.

(2) If the partition frame is made of aluminum, it will act as a reflector for the light source, eliminating uneven light and making the light of the characters uniform. This eliminates the need for a reflector, making it extremely inexpensive due to savings in materials and installation labor.

(3) The electrode part of a cold cathode discharge tube generates heat and raises the ambient temperature. However, since the partition frame is made of non-ferrous metal or metal, the partition frame acts extremely effectively as a heat dissipation plate. will never rise.

(4) By providing a vertically long protrusion in the space in which the cold cathode discharge tube is housed, the cold cathode discharge tube is held in the discharge tube, and when the discharge tube and the protrusion come into contact with each other or come close to each other, they act as a proximal conductor and start the discharge. It can be easily done.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a digital light emitting display element for a large watch according to the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a perspective view showing another embodiment of the present invention. , FIG. 4 is a perspective view showing the mounting arrangement of cold cathode discharge tubes on a printed circuit board. Note that the correspondence relationship between the main parts shown and the symbols is as follows. 1...Nonferrous metal or metal partition frame, 2...Printed circuit board, 3...Cold cathode discharge tube, 4...Oscillation transformer, 5, 6...Central space, 7, 8...Storage chamber, 9 , 9'... Electrode section, 14, 15... Projection section.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Cold cathode discharge tubes are housed in a plurality of storage chambers adjacent to the central space of a partition frame made of non-ferrous metal or metal, and both electrode parts of the cold cathode discharge tube are housed. A digital light-emitting display element for a large watch, characterized in that: is attached to a printed circuit board that closes the back side of the partition frame, and oscillation transformers are disposed between both the electrode parts and on the printed circuit board. (2) In the digital light emitting display device described in claim (1) for utility model registration, vertically elongated protrusions in the space of the non-ferrous metal or metal partition frame are installed opposite each other in the vertical direction, and the protrusions A digital light-emitting display element for large watches that holds a cold cathode discharge tube in the center.