JPH0256828A - Manufacture of fluorescent lamp and chromaticity control device - Google Patents

Abstract

PURPOSE:To make it possible to automate the chromaticity control in the manufacturing process by measuring the luminous spectrum of the spread phosphor to find the mixing ratio of the phosphor, inferring the chromaticity at the completion of the lamp from the measured value, regulating the mixing ratio of the phosphor from the difference with the chromaticity control value of the fluorescent lamp, and carrying out the chromaticity control. CONSTITUTION:A phosphor is spread to a bulb 1, a starilizing lamp 2 is inserted as an ultraviolet-ray radiating source to the bulb 1 in the drying condition, and the luminous spectrum of the phosphor excited by the starilizing lamp 2 is measured with a spectrophotometer 3. The mixing ratio of the phosphor is found, the light color at the completion of the lamp is inferred from the value, the mixing ratio of the phosphor is regulated from the difference with the chromaticity of the fluorescent lamp, and the chromaticity control of the completed lamp in the fluorescent lamp manufacturing is carried out. As a result, the chromaticity control can be carried out in the spreading and drying process before the completion of the lamp, and the feedback to the mixing ratio in the phosphor mixing process can be carried out rapidly in a short time. Consequently, the automation of the chromaticity control in the manufacturing process is made possible.

Description

[Detailed Description of the Invention] Industrial Application Field The light color of fluorescent lamps is one of the important lamp characteristics.
JIS-Z9112 (color classification of fluorescent lamps: 1983)
Based on this, lamp manufacturers create and manage standards for the chromaticity control range for each product. In the case of three-component long-range fluorescent lamps, the chromaticity difference of (xty) is approximately ±o, oos.
This is a narrow control range, and is an extremely strict standard for three-component long-range fluorescent lamps manufactured by mixing three types of phosphors. In order to satisfy this standard and maintain high quality, the blending ratio of the phosphor is adjusted during manufacturing.The present invention is designed to improve the efficiency of chromaticity control by as early as possible in the process after phosphor preparation. This technology is used to predict the chromaticity of finished lamps.

Conventional technology The production of three-component long-range fluorescent lamps starts with blue.

A mixture of three types of phosphors, green and red, is made and applied to the bulb. The coated bulb goes through the steps of drying, sinking, exhausting, sealing, and aging to become a finished lamp. This completed lamp is taken out at regular intervals and placed in an integrating sphere to measure the chromaticity (x, y). If this chromaticity deviates from the control point, the result is fed back to the blending process to adjust the mixing ratio of the phosphors in the blend.

Problems to be Solved by the Invention As shown above, chromaticity management in the manufacture of fluorescent lamps is performed by repeating this feedback loop. Adjusting the mixing ratio of phosphors is delicate and is a difficult task that relies on the intuition of the operator. Furthermore, since the chromaticity is managed using the method described above, it takes approximately one hour after the phosphor is applied until the chromaticity result of the completed lamp is known. In this darkness, lamp manufacturing continues, so it is unacceptable for the measurement results of completed lamps to deviate from the chromaticity control range.For this reason, a control range that is even narrower than the standard has been set. The chromaticity is adjusted with great care during the compounding process.

Thus, due to the long management feedback time,
There is a risk of a large number of defects occurring if there is a management error, and the narrow range of chromaticity control makes adjusting the phosphor blending ratio a difficult task, which puts a lot of stress on workers. There's a problem.

Means for Solving the Problems In order to solve the above problems, in the fluorescent lamp manufacturing process where multiple types of phosphors are mixed and applied, phosphors are applied to the bulb, dried, and then placed inside the bulb. Insert an ultraviolet radiation source, make the coated phosphor emit light, measure its emission spectrum, determine the blending ratio of the phosphor, estimate the light color when the lamp is completed from that value, and manage the chromaticity of the fluorescent lamp. The chromaticity of finished lamps in fluorescent lamp manufacturing is managed by adjusting the blending ratio of phosphors based on the difference between the values.

Effect: By the method described above, chromaticity control in the fluorescent lamp manufacturing process can be performed in the coating and drying process without waiting for completion of the lamp, and feedback to the mixing ratio to the phosphor mixing process can be quickly and quickly performed.

For this reason, a feedback loop is created in which the completed lamp is taken out at regular intervals, placed in an integrating sphere, and its chromaticity (xsy) is measured, and the results are fed back to the formulation process to adjust the mixing ratio of the phosphors in the formulation. This eliminates the need for repetition and improves manufacturing efficiency. In addition, conventionally adjusting the mixing ratio of phosphors was delicate and a difficult task that relied on the intuition of the operator, but this makes it possible to automate chromaticity management during the manufacturing process.

Embodiment As an embodiment of the present invention, chromaticity control in the manufacturing process of a three-component long-range fluorescent lamp will be explained with reference to the drawings.

FIG. 1 shows a method of emitting light from a bulb coated with a phosphor after a drying process and measuring the emission spectrum of the phosphor. In FIG. 1, reference numeral 1 indicates a bulb coated with a phosphor. A germicidal lamp 2 is inserted into the bulb 1 as an ultraviolet radiation source. The emission spectrum of the phosphor excited by this germicidal lamp 2 is measured by a spectrometer 3. An example of the emission spectrum (including the mercury emission line from the germicidal lamp 2) measured by this measuring device is shown in Figure 2. Of this spectrum shown in the figure, excluding the mercury emission line and finding the wavelength range in which each phosphor emits light independently, the shaded area in FIG. 2 is determined. and,
The light emission ratio of the three phosphors is determined from the ratio of the areas of the shaded areas.

For green-emitting phosphors, the wavelength bandwidth of the spectrometer is 5n
m or less, a value of 540 nm is also available.

Next, based on the correlation data of the luminescence ratio of the three phosphors between the bulb and the lamp, which was created in advance for each product type and manufacturing group, we calculated the luminescence ratio of the three phosphors of the bulb.
Correct the emission ratio of the phosphor.

This correction may vary depending on the conditions after the drying process in the fluorescent lamp manufacturing process, such as the sintering process, or the type of lamp.
This is done because the emission ratios of the three phosphors between the bulb and the lamp are different, and separate spectral distribution data for each of the blue, green, and red phosphors must be prepared in advance. , a single spectral distribution is synthesized according to the already determined ratio of the three phosphor emission ratios of the completed lamp.

Furthermore, 25°C mercury brightness II (visible range) data prepared for each product type is added to synthesize the spectral distribution data of the completed lamp. This is because the spectral intensity of the mercury emission line included in the spectral distribution differs depending on the type of lamp. Then, from this spectral data, the chromaticity (x+y) of the completed lamp is determined by chromaticity calculation. With this method, it is possible to predict the chromaticity of a completed lamp without being affected by changes or variations in the ratio of mercury emission lines.

In addition, in the method, ion lamps etc. are used instead of germicidal lamps,
Anything that can excite three types of phosphors can be used.

Effects of the invention By the method described above, chromaticity control in the fluorescent lamp manufacturing process can be performed in the coating and drying process without waiting for the completion of the lamp, and feedback on the mixing ratio to the phosphor mixing process can be quickly and quickly provided. can be done. For this reason, the completed lamp is taken out at regular intervals and placed in an integrating sphere with chromaticity (x
. , manufacturing efficiency is improved. In addition, conventionally, adjusting the mixing ratio of phosphors is delicate;
Previously, this was a difficult task that relied on the intuition of the operator, but this makes it possible to automate chromaticity management during the manufacturing process.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a method of emitting light from a bulb coated with phosphor after a drying process and measuring the emission spectrum of the phosphor as an example of the present invention, and Figure 2 is a diagram showing a method of measuring the emission spectrum of the phosphor using the method shown in Figure 1. A diagram showing an example of the emission spectrum of a phosphor-coated bulb (including the mercury emission line from germicidal lamp 2),
FIG. 3 is a process diagram for predicting the light color of a completed lamp from the emission spectrum of a bulb coated with phosphor. 110. Bulb coated with phosphor after drying process, 200. Germicidal lamp, 3000 spectrometer. Name of agent: Patent attorney Toshio Nakao

Claims (3)

[Claims] (1) In the manufacturing process of fluorescent lamps, in which multiple types of phosphors are mixed and applied, the phosphor is applied to the bulb, and after drying, an ultraviolet radiation source is inserted into the bulb, causing the applied phosphor to emit light. The light emission spectrum is measured, the phosphor mixing ratio is determined, the light color when the lamp is completed is estimated from that value, and the phosphor mixing ratio is adjusted based on the difference with the chromaticity control value of the fluorescent lamp. A method for manufacturing a fluorescent lamp, characterized in that chromaticity is controlled by (2) Partially separate the spectrum in the visible wavelength range of the excitation radiation source used to excite the phosphor from the emission spectrum of the phosphor-coated bulb, and separate the emission spectrum of each phosphor. Claims that calculate the luminescence ratio of the phosphor, correct the luminescence ratio to the value after completion of the lamp, synthesize the spectrum of the completed lamp based on the corrected luminescence ratio of the phosphor, and predict its chromaticity. 2. A method for manufacturing a fluorescent lamp according to item 1. (3) a device for inserting an ultraviolet radiation source into a phosphor-coated bulb and turning it on; and a spectrometer for measuring the emission spectrum of the phosphor in the phosphor-coated bulb excited by the ultraviolet radiation source; A chromaticity management device for manufacturing a fluorescent lamp, comprising a calculation device that calculates the light color of a completed lamp from the measured emission spectrum of the phosphor of the phosphor-coated bulb.