WO2014021049A1 - Ceramic metal halide lamp - Google Patents

Description

Ceramic metal halide lamp

The present invention relates to a high-intensity discharge lamp, and more particularly to a ceramic metal halide lamp.

High-intensity discharge lamps (hereinafter referred to as HID lamps) are widely used because of their high efficiency and economy. HID lamps are roughly classified into three types, mercury lamps, metal halide lamps, and high-pressure sodium lamps, depending on the type of additive sealed in the arc tube. In general, high-pressure sodium lamps have a long lifetime and high luminous efficiency, but high-saturation and color-rendering high-pressure sodium lamps are known as light sources for vividly displaying red colors, although their lifetime and luminous efficiency are inferior to ordinary high-pressure sodium lamps. It has been. In recent years, ceramic metal halide lamps using an arc tube made of ceramic (translucent alumina: PCA) instead of an arc tube made of quartz glass have been widely used. The lamp life and luminous efficiency of ceramic metal halide lamps are said to be superior to that of high chroma and color rendering high pressure sodium lamps.

However, high-saturation and color-rendering high-pressure sodium lamps are usually used for lighting fresh foods.

In the case of a high saturation high color rendering high-pressure sodium lamp, the correlated color temperature is about 2500 K. However, in the case of a ceramic metal halide lamp, the correlated color temperature is relatively high, and it is difficult to achieve about 2500 K.

Japanese Unexamined Patent Publication No. 2004-288617 (Japanese Patent No. 4279122) discloses a ceramic metal halide lamp having a correlated color temperature of 2000 to 4500 K, Japanese Unexamined Patent Publication No. 2003-187744 and Japanese Unexamined Patent Publication No. 2009-520323. Ceramic metal halide lamps having a color temperature of 2500 to 4500K, Japanese Unexamined Patent Application Publication Nos. 2007-53004 and 2011-154847 describe ceramic metal halide lamps having a color temperature of 2800 to 3700K, respectively. However, these patent documents do not disclose a specific technique for reducing the correlated color temperature to about 2500 K, but also disclose a specific technique for making a red-colored irradiation object appear colorful. Not.

The wavelength spectrum distribution is also important as an illumination condition. In JP 2009-87602 A and JP 2012-113883 A, in order to perform efficient growth in a plant factory, in order to adjust the ratio of the energy intensity of the wavelength region of three colors to a predetermined value. It describes the setting of arc tube additives.
JP 2004-288617 A (Patent No. 4279122) Japanese Patent Laid-Open No. 2003-1877444 (Japanese Patent No. 4262968) JP 2009-520329 A JP 2007-53004 A JP 2011-154847 JP 2010-3488 JP 2009-87602 JP JP 2012-113883 A

As described above, in the conventional technology, a technique for making a red-colored object to be vividly displayed in a ceramic metal halide lamp, such as a high-saturation, high-color-rendering high-pressure sodium lamp, has not been established.

An object of the present invention is to provide a ceramic metal halide lamp suitable for illumination of fresh foods such as a high chroma and high color rendering high-pressure sodium lamp that wants to show a red color vividly.

According to the present invention, there is provided a ceramic metal halide lamp having an arc tube formed of a translucent ceramic in which a rare gas for start-up, mercury, and an additive are enclosed, and a translucent outer tube that houses the arc tube. In the manufacturing method,
Visible light wavelength region 380 to 780 nm, purple-blue first wavelength region with wavelength 380 to 490 nm, green second wavelength region with wavelength 490 to 570 nm, and yellow third wavelength with wavelength 570 to 590 nm A wavelength region dividing step for dividing the region into an orange-red fourth wavelength region having a wavelength of 590 to 780 nm;
The ratio of the integrated values of the energy intensity of light from the arc tube calculated for each of the four wavelength regions is 6 ± 3: 18 ± 5: 6 ± 3: 70 ± 11 (however, the total value is 100). As described above, an additive setting step for setting the composition and amount of the additive is included.

According to this embodiment, in the additive setting step, the ratio of the integrated values of the energy intensity of light from the arc tube calculated for each of the four wavelength regions is 6 ± 1: 18 ± 3: 6 ± 1: The composition and addition amount of the additive are set so as to be 70 ± 5 (however, the total value is 100).

According to the present invention, in a ceramic metal halide lamp having an arc tube formed of a translucent ceramic in which a starting rare gas, mercury, and an additive are enclosed, and a translucent outer tube that houses the arc tube. Visible wavelength region 380 to 780 nm, purple-blue first wavelength region with wavelength 380 to 490 nm, green second wavelength region with wavelength 490 to 570 nm, and yellowish third wavelength region with wavelength 570 to 590 nm. The ratio of the integrated value of the energy intensity of the light from the arc tube calculated for each of the four wavelength regions is 6 ± 3 divided into a wavelength region and an orange-red fourth wavelength region having a wavelength of 590 to 780 nm. : 18 ± 5: 6 ± 3: 70 ± 11 (however, the total value is 100), and the composition and amount of the additive are set.

According to this embodiment, the ratio of the integrated values of the energy intensity of light from the arc tube calculated for each of the four wavelength regions is 6 ± 1: 18 ± 3: 6 ± 1: 70 ± 5 (however, the total value) 100), the composition and addition amount of the additive are set.

According to the present invention, it is possible to provide a ceramic metal halide lamp suitable for lighting fresh foods such as a high chroma and color rendering high-pressure sodium lamp that wants to show a red color vividly.

FIG. 1 is a diagram illustrating an example of an arc tube of a ceramic metal halide lamp according to the present embodiment. FIG. 2 is a diagram illustrating an example of a ceramic metal halide lamp according to the present embodiment. FIG. 3 is a diagram illustrating an example of a ceramic metal halide lamp according to the present embodiment. FIG. 4 is a diagram showing examples of wavelength spectra of a high-pressure sodium lamp and a conventional ceramic metal halide lamp. FIG. 5 is a diagram showing examples of wavelength spectra of the ceramic metal halide lamp according to the present embodiment and the conventional ceramic metal halide lamp.

Hereinafter, embodiments of a ceramic metal halide lamp according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

An example of an arc tube of a ceramic metal halide lamp according to the present invention will be described with reference to FIG. The arc tube 2 includes a light emitting unit 3 and capillaries 4A and 4B extending at both ends thereof. The light emitting section 3 and the capillaries 4A and 4B are formed by compressing and integrally forming a light transmitting ceramic powder such as alumina. Electrode assemblies 6A and 6B are inserted through both ends of the capillaries 4A and 4B, respectively. Both ends of the capillaries 4A and 4B are hermetically sealed by frit glass having electrical insulation. Thereby, the electrode assemblies 6A and 6B are fixed in place in the capillaries 4A and 4B. The electrodes 5A and 5B provided at the inner ends of the electrode assemblies 6A and 6B are arranged at fixed positions in the light emitting unit 3. Power supply leads 7A and 7B protrude from both ends of the capillaries 4A and 4B.

The inside of the light emitting unit 3 is filled with additives in addition to argon and mercury. Additives include luminescent materials such as alkali metal iodides, alkaline earth metal iodides, rare earth metal iodides, and the like. The additive sealed in the light emitting unit 3 will be described in detail later.

The effective length L and the effective inner diameter D are defined as the inner dimensions of the arc tube 2. The effective length L is the distance between both end faces in the case of a cylindrical arc tube, and in the arc tube in which the light emitting part and the capillary are continuously formed as shown in FIG. 1, light is emitted from the straight tubular capillaries 4A and 4B. It is defined by the distance between the outer ends of the transition curved surfaces L1, L1 between the tubes 3. The effective inner diameter D is defined as the maximum inner diameter of the central portion between the electrodes 5A and 5B in a light emitting tube other than a cylindrical shape. The effective length of the arc tube 2 is L, the effective inner diameter is D, and the ratio L / D between them is called the aspect ratio.

The temperature of each part of the light emitting unit 3 is determined by the wall load of the arc tube, the gas pressure in the translucent outer tube, the arc tube material, and the aspect ratio (L / D) of the arc tube, and particularly depends greatly on the wall load. The wall surface load is defined by a value obtained by dividing the lamp power by the total inner area of the light emitting unit 3. In the present embodiment, the light emitting unit 3 is designed so that the wall load is 20 to 30 W / cm ² (rated output 35 to 400 W). Thus, in this embodiment, the chemical reaction rate between the material constituting the inner wall surface of the light emitting part and the rare earth metal iodide can be kept low, and the life of the lamp can be extended.

An example of a ceramic metal halide lamp according to the present invention will be described with reference to FIG. The ceramic metal halide lamp 1 of the present example includes a light emitting tube 2, a cylindrical translucent sleeve 18 disposed so as to surround the light emitting portion 3, and an outer sphere 13 provided with a base 12 at one end. The structure of the arc tube 2 has been described with reference to FIG.

Two stems 15 and 16 are mounted on the stem 14 of the base 12. Two support disks 17A and 17B are mounted on the support at predetermined intervals. A cylindrical translucent sleeve 18 is fixed to the disks 17A and 17B. A getter 20 is mounted on the disk 17B. Power supply leads 7A and 7B protrude from both ends of the capillaries 4A and 4B. The tips of the power supply leads 7A and 7B are welded to the columns 15 and 16 directly or via nickel wires 19A and 19B, respectively. Thus, the electrodes 5A and 5B of the arc tube 2 are electrically connected to the base 12 via the power supply leads 7A and 7B and the columns 15 and 16.

An example of a ceramic metal halide lamp according to the present invention will be described with reference to FIG. The ceramic metal halide lamp 1 of this example has an arc tube 2 and an outer bulb 13. The structure of the arc tube 2 has been described with reference to FIG. An outer sphere tip-off portion 13A is formed at one end of the outer sphere 13, and a pinch seal portion 13B is formed at the other end. A base 12 is attached to the end of the pinch seal portion 13B. External terminals 9 </ b> A and 9 </ b> B are attached to the base 12.

Two struts 15 and 16 are fixed to the pinch seal portion 13B. Power supply leads 7A and 7B protrude from both ends of the capillaries 4A and 4B. The tips of the power supply leads 7A and 7B are welded to the columns 15 and 16, respectively. A getter 20 is mounted on the column 15. The support columns 15 and 16 are electrically connected to the external terminals 9A and 9B via the metal foils 8A and 8B at the pinch seal portion 13B.

Thus, the electrodes 5A and 5B of the arc tube 2 are electrically connected to the external terminals 9A and 9B via the power supply leads 7A and 7B, the support columns 15 and 16, and the metal foils 8A and 8B.

The ceramic metal halide lamp according to this embodiment may be a reflective ceramic metal halide lamp provided with a concave reflecting mirror in addition to the examples shown in FIGS.

The inventor of the present application examined the reason why high-saturation and high-color-rendering high-pressure sodium lamps were favorably used for lighting fresh foods. Various factors such as correlated color temperature CCT, color rendering index CRI, and wavelength spectrum distribution can be considered as the reason.

FIG. 4 shows an example of wavelength spectra of a high-saturation, high color rendering high-pressure sodium lamp (“NH” in the figure) and a conventional ceramic metal halide lamp (“CMH (conventional)” in the figure). The vertical axis represents energy [%], and the horizontal axis represents wavelength [nm]. The solid curve shows the wavelength spectrum of a high-chroma and high-color-rendering high-pressure sodium lamp (NH), and the dashed curve shows the wavelength spectrum of a conventional ceramic metal halide lamp (CMH). As shown in the figure, in the case of a high-chroma and high-color-rendering high-pressure sodium lamp, the energy value of a red wavelength component having a wavelength of 600 nm or more is larger than that of a conventional ceramic metal halide lamp, but there is no wavelength near 580 nm. Therefore, the high saturation and high color rendering high-pressure sodium lamp seems to be unsuitable for lighting fresh foods such as vegetables, bread and meat that want to show the red color vividly. However, as described above, in practice, high-saturation and color-rendering high-pressure sodium lamps are favorably used for lighting fresh food. The reason is not understood from the wavelength spectrum of the high-saturation, high color rendering high-pressure sodium lamp shown in FIG.

The inventors of the present application, as a result of repeated trial and error with reference to the wavelength spectrum of a high-chroma and high-color-rendering high-pressure sodium lamp, found that the ceramic metal halide can show red colors as vividly as the high-saturation and high-rendering-type high-pressure sodium lamp. We were able to prototype a lamp.

Table 1 shows the measurement results of the color rendering index of a high-saturation, high-color-rendering high-pressure sodium lamp (NH), a conventional ceramic metal halide lamp (CMH), and a prototype ceramic metal halide lamp (CMH). Since the prototype ceramic metal halide lamp (CMH) is an example of this embodiment, Table 1 shows the ceramic metal halide lamp (CMH) of this embodiment.

The first column of Table 1 is the color rendering index, the second column is the name of the color rendering index, the third is the measurement result of the color rendering index of the high-saturation, high color rendering high-pressure sodium lamp (NH), and the fourth column is conventional. Table 5 shows the measurement results of the color rendering index of the ceramic metal halide lamp (CMH), and the fifth column shows the measurement results of the color rendering index of the ceramic metal halide lamp (CMH) according to this embodiment.

The color rendering index represents the deviation from the color when viewed with the reference light defined by JIS. If the color rendering index is 100, this indicates a state where there is no deviation from the color when viewed with reference light. The closer the color rendering index is to 100, the smaller the color shift. As shown in Table 1, the various color rendering indices of the conventional ceramic metal halide lamp according to the present embodiment and the high color rendering high pressure sodium lamp are sufficiently high. Furthermore, the various color rendering evaluation numbers of the ceramic metal halide lamp according to the present embodiment are higher than those of the conventional ceramic metal halide lamp.

The present invention could be completed by conducting the following consideration on the prototype ceramic metal halide lamp of the present embodiment.

FIG. 5 shows examples of wavelength spectra of the ceramic metal halide lamp according to the present embodiment and the conventional ceramic metal halide lamp. The vertical axis represents energy [%], and the horizontal axis represents wavelength [nm]. A solid curve indicates the wavelength spectrum of the ceramic metal halide lamp according to the present embodiment, and a broken curve indicates the wavelength spectrum of the conventional ceramic metal halide lamp.

As shown in the drawing, in the case of the conventional ceramic metal halide lamp, the energy of the red wavelength component having a wavelength of 630 nm or more is small, but in the case of the ceramic metal halide lamp according to the present embodiment, it has a wavelength peak near the wavelength of 680 nm. However, in the case of the ceramic metal halide lamp according to the present embodiment, there is no loss of wavelength in the vicinity of the wavelength of 580 nm as in the case of the high chroma and color rendering high pressure sodium lamp. The ceramic metal halide lamp according to the present embodiment has been found to be suitable for illumination of fresh food, but the reason is not known from the wavelength spectrum shown in FIG.

Therefore, the inventor of the present application divides the wavelength region 380 to 780 nm of visible light into six wavelength regions, a high saturation high color rendering high pressure sodium lamp (NH), a conventional ceramic metal halide lamp (CMH), and the present embodiment. The integrated value (relative value) of the energy intensity in each wavelength region was determined for the ceramic metal halide lamp (CMH). This is shown in Table 2. The integrated value of the energy intensity corresponds to the area below the waveform.

The first column of Table 2 is six wavelength regions, the second column is the color of each wavelength region, the third column is the upper and lower limits of the wavelength of each wavelength region, the fourth column is a high saturation high color rendering high pressure sodium lamp (NH) The fifth column shows the integrated value of the energy intensity in each wavelength region, the fifth column shows the integrated value of the energy intensity in each wavelength region in the case of the conventional ceramic metal halide lamp (CMH), the sixth column shows the ceramic metal halide lamp according to this embodiment ( The integrated value of energy intensity in each wavelength region in the case of CMH). The integrated values in the fourth, fifth, and sixth columns are relative values.

The first wavelength region represents a violet system with a wavelength of 380 to 430 nm, the second wavelength region represents a blue system with a wavelength of 430 to 490 nm, the third wavelength region represents a green system with a wavelength of 490 to 570 nm, and the fourth wavelength region It represents a yellow system with a wavelength of 570 to 590 nm, the fifth wavelength region represents an orange system with a wavelength of 590 to 620 nm, and the sixth wavelength region represents a red system with a wavelength of 620 to 780 nm.

In Table 2, the energy intensity ratio for the conventional ceramic metal halide lamp is significantly different from the energy intensity ratio for the high-pressure sodium lamp. The energy intensity ratio in the case of the ceramic metal halide lamp according to the present embodiment is also different from the energy intensity ratio in the case of the high chroma and color rendering high pressure sodium lamp. Therefore, from Table 2, even if the reason why the conventional ceramic metal halide lamp is not suitable for lighting fresh food that wants to show the red color vividly can be explained, the ceramic metal halide lamp according to the present embodiment has high chroma and high color rendering. As with the high-pressure sodium lamp, the reason why it is suitable for lighting fresh food cannot be explained.

Next, the inventor of the present application divides the wavelength region 380 to 780 nm of visible light into four wavelength regions, a high pressure sodium lamp (NH), a conventional ceramic metal halide lamp (CMH), and the ceramic metal halide according to the present embodiment. For the lamp (CMH), the integrated value (relative value) of the energy intensity in each wavelength region was determined. This is shown in Table 3.

In Table 3, the first wavelength region represents a violet blue system with a wavelength of 380 to 490 nm, the second wavelength region represents a green system with a wavelength of 490 to 570 nm, and the third wavelength region is a yellow system with a wavelength of 570 to 590 nm. The fourth wavelength region represents an orange-red system with a wavelength of 590 to 780 nm.

In Table 3, the energy intensity ratio in the case of a conventional ceramic metal halide lamp is greatly different from the energy intensity ratio in the case of a high-pressure sodium lamp. However, the ratio of energy intensity in the case of the ceramic metal halide lamp according to the present embodiment substantially matches the ratio of energy intensity in the case of the high-pressure sodium lamp.

Therefore, from Table 3, the reason why the conventional ceramic metal halide lamp gives an impression different from the high saturation high color rendering high pressure sodium lamp can be explained. At the same time, the ceramic metal halide lamp according to the present embodiment is a high saturation high color rendering high pressure sodium lamp. Similarly, the reason why it is suitable for lighting fresh food that wants to show the red color vividly can be explained.

As shown in Table 3, in the ceramic metal halide lamp according to the present embodiment, the ratio of energy intensity in the four wavelength regions is 6: 19: 6: 69. On the other hand, in the high chroma and color rendering high pressure sodium lamp, the ratio of the energy intensity in the four wavelength regions is 5: 17: 5: 73. Therefore, when the ratio of the energy intensity in the four wavelength regions is at least 5 to 6:17 to 19: 5 to 6:69 to 73 (total value is 100), it is suitable for fresh food lighting. It can be said that there is.

Therefore, the inventor of the present application actually measured the allowable range of the ratio of the integrated values of the energy intensity in the four wavelength regions as a condition for being suitable for the illumination of fresh foods that would like to show the red color brilliantly. In the ceramic metal halide lamp according to the present embodiment, the ratio of the integrated values of the energy intensity in the four wavelength regions was changed and used for lighting fresh foods such as vegetables, bread and meat, respectively. In contrast, the number of people who answered “brilliant” was counted. The respondents are 50 men and women between the ages of 18 and 64. As a result, the following knowledge was obtained.

When the ratio of energy intensity in the four wavelength regions is 6 ± 3: 18 ± 5: 6 ± 3: 70 ± 11 (total is 100), more than 90% of people have fresh food color “brilliant” I replied. When the ratio of energy intensity in the four wavelength regions is 6 ± 1: 18 ± 3: 6 ± 1: 70 ± 5 (total is 100), 96% or more of people have fresh food color “brilliant” I replied.

Therefore, according to the ceramic metal halide lamp according to the present embodiment, the ratio of the energy intensity in the four wavelength regions is 6 ± 3: 18 ± 5: 6 ± 3: 70 ± 11 (however, the sum is 100), preferably 6 ± 1: 18 ± 3: 6 ± 1: 70 ± 5 (total is 100).

The following knowledge can be obtained from the analysis of the wavelength spectrum. Dividing the visible light wavelength range of 380 to 780 nm into six wavelength ranges and determining the ratio of the integrated values of the energy intensities in each wavelength range gives details of the characteristics of the wavelength spectrum of the lamp. It cannot be determined whether or not it is suitable for lighting fresh foods that want to show the color of the system vividly. However, when the visible light wavelength range of 380 to 780 nm is divided into four wavelength ranges and the ratio of the integrated values of the energy intensities in each wavelength range is determined, the lamp can be used for lighting fresh foods that want to show the red color vividly. Whether it is suitable or not can be determined.

Table 4 shows the composition of the arc tube additive of the ceramic metal halide lamp used in the experiment conducted by the inventors of the present application. Here, examples of five types of ceramic metal halide lamps having a correlated color temperature of 2500 K and a chromaticity deviation Duv within ± 2 are shown.

In Table 4, M (TmI ₃ ), M (HoI ₃ ), M (TlI), M (NaI), M (CaI ₂ ), and M (LiI) are respectively thulium iodide TmI ₃ and iodide. It represents the molar ratio (percentage) of holmium HoI ₃ , thallium iodide TlI, sodium iodide NaI, calcium iodide CaI ₂ and lithium iodide LiI. In experiments conducted by the inventors of the present application, the arc tube additive contains thallium iodide TlI, sodium iodide NaI, calcium iodide CaI ₂ and lithium iodide LiI. Sodium Na contributes to the orange system, calcium Ca contributes to the red system, and lithium Li contributes to the crimson system. By adding sodium iodide NaI, calcium iodide CaI ₂ and lithium iodide LiI in a predetermined molar ratio, a desired correlated color temperature can be obtained.

By adding thallium iodide TlI, the luminous efficiency increases, but the chromaticity deviation Duv increases. However, in this embodiment, by adding calcium iodide CaI _2, to suppress the increase of the chromaticity deviation Duv.

Further, the additive may include thulium iodide TmI ₃ as the rare earth metal iodide ReI _3, and may further include holmium iodide HoI ₃ . Luminous efficiency is improved by adding thulium iodide TmI ₃ and holmium iodide HoI ₃ , respectively.

The following knowledge is obtained from Table 4. According to the present embodiment, the arc tube additive includes sodium iodide NaI, calcium iodide CaI ₂ and lithium iodide LiI, and the molar ratio thereof is expressed as follows.

30 mol% <M (NaI) <70 mol% Formula 1
10 mol% <M (CaI ₂ ) <40 mol% Formula 2
10 mol% <M (LiI) <30 mol% Formula 3
Further, when the sum of the molar ratio of sodium iodide, the molar ratio of calcium iodide, and the molar ratio of lithium iodide is M (NaI + CaI ₂ + LiI), this value satisfies the following formula.

50mol% <M (NaI + CaI 2 + LiI) <96mol% Formula 4
The inventor of the present application selected the following parameters by paying attention to the amount of sodium iodide in the additive.

The amount of rare earth metal iodide added is G (ReI ₃ ), the amount of alkali metal iodide added is G (AI), and the amount of alkaline earth metal iodide added is G (AeI ₂ ). . The amount of thallium iodide added is expressed as G (TlI), and the total amount of additives is expressed as G (total). The total amount G (total) of the additive is expressed by the following formula.

G (total) = G (ReI ₃ ) + G (AI) + G (AeI ₂ ) + G (TlI) Equation 5
Here, G (total), G (ReI ₃ ), G (AI), G (AeI ₂ ), and G (TlI) are masses per 1 cm ^{3 of} the arc tube volume, and the unit is [mg / cm ³ ].

The molar ratio of sodium iodide to the total number of moles of additive is M (NaI) [mol%], and the sum of the molar ratio of the rare earth metal iodide and the thallium iodide is M (ReI ₃ + TlI) [mol %]. Let α be the ratio of the molar ratio M (NaI) of sodium iodide to the sum M (ReI ₃ + TlI) of this molar ratio. α is represented by the following equation.

α = M (NaI) / M (ReI ₃ + TlI) Equation 6
The numerical values in Table 5 are the values of α represented by Formula 6, the sum of the molar ratio of rare earth metal iodide and the molar ratio of thallium iodide, M (ReI ₃ + TlI), for the additives shown in Table 4. 5 shows the results of calculating the total amount G (total) of additives per 1 cm ³ arc tube volume represented by 5, and the rare earth metal iodide addition amount G (ReI ₃ ) per 1 cm ³ arc tube volume. As shown in Table 4, rare earth metal iodides ReI ₃ are thulium iodide TmI ₃ and holmium iodide HoI ₃ .

Table 6 shows the results of measuring the correlated color temperature CCT, chromaticity deviation Duv, average color rendering index Ra, and luminous efficiency η for these five ceramic metal halide lamps. The average color rendering index Ra was greater than 90, and the luminous efficiency was greater than 75 lm / W.

Although the ceramic metal halide lamp according to the present invention has been described above, these are examples and do not limit the scope of the present invention. Additions, deletions, changes, improvements, and the like that can be easily made by those skilled in the art to the present embodiment are within the scope of the present invention. The technical scope of the present invention is defined by the appended claims.

DESCRIPTION OF SYMBOLS 1 ... Ceramic metal halide lamp, 2 ... Arc tube, 4A, 4B ... Capillary, 5A, 5B ... Electrode, 6A, 6B ... Electrode assembly, 7A, 7B ... Power supply lead, 8A, 8B ... Metal foil, 9A, 9B ... External Terminal: 12 ... Base, 13 ... Outer sphere, 14 ... Stem, 15, 16 ... Post, 17A, 17B ... Support disk, 18 ... Translucent sleeve, 19A, 19B ... Nickel wire, 20 ... Getter, 13A ... Outer sphere Chip-off part,
13B ... Pinch seal part

Claims (4)

In a method for manufacturing a ceramic metal halide lamp, comprising: an arc tube formed of a translucent ceramic in which a rare gas for start-up, mercury, and an additive are enclosed; and a translucent outer tube that houses the arc tube.
Visible light wavelength region 380 to 780 nm, purple-blue first wavelength region with wavelength 380 to 490 nm, green second wavelength region with wavelength 490 to 570 nm, and yellow third wavelength with wavelength 570 to 590 nm A wavelength region dividing step for dividing the region into an orange-red fourth wavelength region having a wavelength of 590 to 780 nm;
The ratio of the integrated values of the energy intensity of light from the arc tube calculated for each of the four wavelength regions is 6 ± 3: 18 ± 5: 6 ± 3: 70 ± 11 (however, the total value is 100). So, an additive setting step for setting the composition and amount of the additive,
A method for manufacturing a ceramic metal halide lamp including: In the manufacturing method of the ceramic metal halide lamp of Claim 1,
In the additive setting step,
The ratio of the integrated values of the energy intensity of light from the arc tube calculated for each of the four wavelength regions is 6 ± 1: 18 ± 3: 6 ± 1: 70 ± 5 (however, the total value is 100). Thus, the composition of the additive and the amount of additive are set, and the method of manufacturing a ceramic metal halide lamp is characterized in that: In a ceramic metal halide lamp having an arc tube formed of a translucent ceramic in which a rare gas for start-up, mercury, and an additive are enclosed, and a translucent outer tube that houses the arc tube,
Visible light wavelength region 380 to 780 nm, purple-blue first wavelength region with wavelength 380 to 490 nm, green second wavelength region with wavelength 490 to 570 nm, and yellow third wavelength with wavelength 570 to 590 nm The ratio of the integrated value of the energy intensity of the light from the arc tube calculated for each of the four wavelength regions is 6 ± 3: 6 ± 3: the region is divided into the orange and red fourth wavelength region having a wavelength of 590 to 780 nm. The ceramic metal halide lamp is characterized in that the composition and amount of the additive are set so as to be 18 ± 5: 6 ± 3: 70 ± 11 (the total value is 100). The ceramic metal halide lamp according to claim 3,
The ratio of the integrated values of the energy intensity of the light from the arc tube calculated for each of the four wavelength regions is 6 ± 1: 18 ± 3: 6 ± 1: 71 ± 5 (however, the total value is 100). Thus, the ceramic metal halide lamp is characterized in that the composition and amount of the additive are set.

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