JP2008094634A - Method for producing diamond particle whose cut surface is colored and method for producing diamond particle on whose cut surface pattern is drawn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a diamond particle whose cut surface is colored; and to provide a method for producing a diamond particle on whose cut surface a pattern is drawn. <P>SOLUTION: The method for producing the diamond particle whose cut surface is colored comprises irradiating a cut surface to be colored of a diamond particle 12 with high energy ions 13 at an acceleration energy within a range of 1-5 MeV and an irradiation quantity of ion within a range of 1×10<SP>12</SP>-1×10<SP>15</SP>ions/cm<SP>2</SP>in a temperature range of ordinary temperature to about 200°C under a vacuum atmosphere of 10<SP>-3</SP>to 10<SP>-4</SP>Pa by using an ion accelerator. Further, the method for producing the diamond particle on whose cut surface a pattern is drawn comprises irradiating the cut surface with the high energy ions 13 after covering the cut surface with a mask or photoresist perforated into a character or mark shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for producing diamond particles having a cut surface and a method for producing diamond particles having a pattern drawn on the cut surface. More specifically, high energy ions are implanted into the cut surface of the diamond particle to produce a diamond particle colored on the cut surface, and the diamond particle having a pattern such as a letter or mark drawn on the diamond particle cut surface. It relates to a manufacturing method.

  Diamond particles are transparent, colorless and large, and are valuable. However, most diamond particles have low transparency, and small ones are sorted for industrial use. Therefore, a processing method for coloring diamond particles having low transparency and low commercial value for jewelry to make jewelry with high added value has been proposed and partially used. Conventionally, diamond particle coloring methods include (1) high pressure and high temperature treatment (HPHT) method, (2) electron beam irradiation method, (3) neutron irradiation method, (4) radium treatment method, and (5) low energy ion implantation. Laws, etc. are known. The above (1) HPHT method is a method that requires high-temperature heating to several thousand degrees and pressure of several hundred kilobars, and further requires a long time of several tens of hours (Patent Documents 1 to Patent Documents). 2). In these proposed methods, since the entire surface of the diamond particles is colored, color coloring only on a part of the cut surfaces and pattern drawing only on a part of the cut surfaces cannot be performed.

  The electron beam irradiation method (2) is a method in which a cut surface of diamond particles is irradiated with an electron beam of several MeV and then annealed at a temperature of about 1000 ° C. for several hours to several tens of hours (Patent Documents 3 to 3). (See Patent Document 7). According to these proposed methods, it is necessary to shield secondary X-rays generated when the diamond particle cut surface is irradiated with an electron beam, which requires a large facility. In addition, electron beams of several MeV have high transmission power and are likely to generate scattered radiation. Therefore, it is difficult to shield scattered radiation even if a mask is applied to the child cut surface of diamond grains. It is difficult to draw patterns such as.

  The neutron irradiation method of (3) above is a method of irradiating a child cut surface of a diamond grain with neutrons using a nuclear reactor or the like (see Patent Document 8), and then a method of heat-treating at several hundred degrees C (Patent Document 9, Patent Document). 10) is proposed. These proposed methods require a large-scale facility such as a nuclear reactor and may activate impurities in the diamond particles, resulting in a risk of residual radioactivity when using jewelry. Since neutrons with high energy have high penetrating power, even if a mask is applied to the diamond particle cut surface, the mask cannot prevent neutron transmission. Or it is impossible to draw a pattern such as a mark.

  The radium treatment method (4) is a method of irradiating the cut surfaces of the diamond particles with α rays emitted from radium, and is a treatment method proposed by William Crooks in 1904. In this method, in order to put diamond particles in a radium salt, a radioactive material that is a daughter nuclide of radium adheres to the cut surface of the diamond particles. In addition, since it is not beam-like α-ray irradiation, it is difficult to draw a pattern such as a character or a mark on only a part of the diamond particle cut surface.

As the low energy ion implantation method of (5) above, the method described in Patent Document 11 has been proposed. However, after the low energy ions are implanted, a process of heat treatment at 500 ° C. or higher is required (see Patent Document 12). ). In this method, since the ion energy is as low as 50 to 100 keV, the surface modification is only performed in a shallow region from the cut surface to the order of several tens of nm. Therefore, a heat treatment is performed after the ion implantation to diffuse the implanted ions. Further, the ion implantation amount requires a large implantation amount of 5 × 10 ^{15 to} 5 × 10 ¹⁸ ions / cm ² . In addition, the coloring method described in the examples describes only one black color, and does not describe coloring by other colors. Furthermore, characters such as letters and marks drawn by heat treatment may diffuse and become blurred.

As a method for drawing a pattern such as a print or a mark on the cut surface of the diamond particle, there is a method for finely processing the diamond surface. For example, the method described in Patent Document 13 is a method of etching with a focused ion beam. The method described in Patent Document 14 is a method of performing plasma etching after masking. In addition, laser processing methods, etc. are known, and the number and symbol of diamond particle identification, identification, warranty, etc. are engraved, and each certificate and the diamond particle on which these are engraved are the same. It is used for proof that there is a certain thing, and proof that it is an artificial diamond. However, since these techniques are processes by cutting the diamond surface, color drawing is impossible.
Special table 2004-505765 gazette Special table 2003-528023 gazette JP-A-1-131014 JP-A-1-138112 JP-A-1-183409 JP-A-6-263418 Japanese Patent Publication No. 5-36399 Japanese Patent Publication No.57-40120 JP 63-162600 A Japanese Patent Laid-Open No. 6-21985 JP-A-2005-247686 JP-A-2005-247686 JP-A-6-36594 JP 2002-226290 A

The object of the present invention is as follows.
1. To provide a method for producing colored diamond particles having high value as jewelry by coloring the cut surface of diamond particles having low commercial value.
2. Provided is a method for producing colored diamond particles that can be processed in a short time and does not require heat treatment after irradiation.
3. To provide a method for producing diamond particles in which a pattern such as letters or marks is drawn only on a part of cut surfaces.

In order to solve the above problems, in the first invention, in the method for producing diamond particles having a colored cut surface, the cut surface of the diamond particles to be colored has a temperature range of room temperature to about 200 ° C., 10 ⁻³ to 10. ^In a vacuum atmosphere of ⁻⁴ Pa, irradiation with high energy ions with an acceleration energy in the range of 1 to 5 MeV and an ion irradiation amount in the range of 1 × 10 ¹² to 1 × 10 ¹⁵ ions / cm ² is performed by an ion accelerator. Provided is a method for producing diamond particles having colored cut surfaces.

In the second invention, in the method for producing diamond particles having a pattern drawn on the cut surface, the cut surface of the diamond particle is covered with a mask or a mask made of a photoresist, which is processed into a shape such as a character or a mark and has holes drilled. After that, in a temperature range from room temperature to about 200 ° C., in a vacuum atmosphere of 10 ⁻³ to 10 ⁻⁴ Pa, the acceleration energy is in the range of 1 to 5 MeV and the ion irradiation dose is 1 × 10 ¹² from the hole. Provided is a method for producing diamond particles having a pattern drawn on a cut surface, which is characterized by irradiating high energy ions in a range of ˜1 × 10 ¹⁵ ions / cm ² .

The present invention is as described in detail below, has the following particularly advantageous effects, and its industrial utility value is extremely large.
1. The manufacturing method according to the present invention does not require high-temperature heating to several thousand degrees and high pressure unlike the conventional HPHT method, and can be carried out in a temperature range from room temperature to about 200 ° C. Therefore, diamond particles can be used as a noble metal ring or the like. Applicable even after setting.
2. The conventional electron beam irradiation method needs to shield secondary X-rays generated at the time of electron beam irradiation and requires a large facility. However, according to the manufacturing method according to the present invention, the ion accelerator to be used is a secondary X-ray. Since almost no lines are generated, no shielding facilities are required, so the facility does not become large.
3. The conventional electron beam irradiation method requires a heat treatment step for several hours at a temperature of about 1000 ° C. after the irradiation. However, according to the manufacturing method according to the present invention, heat treatment and annealing after ion irradiation of diamond particles are performed. Since it is unnecessary and diamond particles colored in a few minutes to an hour can be produced, productivity is greatly improved.
4). The conventional neutron irradiation treatment method requires a large-scale facility such as a nuclear reactor or a large accelerator, and there is a risk that impurities in diamond may be activated after irradiation. According to the manufacturing method according to the present invention, irradiation is performed. Since the amount of ion energy to be generated is not so high that impurities are activated, there is no fear that diamond particles will be activated.
5. The conventional low energy ion implantation method requires a large amount of ion implantation, but according to the manufacturing method of the present invention, the ion irradiation (implantation) amount is 1000 minutes of the implantation amount by the conventional low energy ion implantation method. The amount can be reduced to 1 or less.
6). According to the manufacturing method according to the present invention, the type of coloring and the coloring concentration can be adjusted by adjusting the type and irradiation time of the ion source, so that various colored products can be manufactured.
7). According to the manufacturing method according to the present invention, it is possible to draw an arbitrary pattern on the cut surface of diamond particles, and it is possible to manufacture a high-value-added jewelry with an original design that has not existed before.
8). According to the manufacturing method according to the present invention, it is possible to easily draw patterns such as numbers and letters on the cut surface of the diamond particles, so that it is possible to draw an identification number, a maker logo, and a maker mark on the diamond particles. Since it can be easily distinguished from fake brands by drawing, it is possible to increase customer confidence in diamond particles.

Hereinafter, the present invention will be described in detail.
In the present invention, diamond particles refer to particles obtained by processing natural diamond raw stone into particles and cutting them out, and applying various cuts to the cut particle surfaces. The kind of diamond is not particularly limited, and may be any of Ia type, Ib type, IIa type, and IIb type. There are no particular restrictions on the shape of the diamond particle cut, and conventionally known cut shapes such as musquiz cut, baguette cut, oval cut, french cut, pair sharp cut, briolette cut, table cut, rose cut , Cabochon cut, step cut, brilliant full cut, eight cut, scissor cut, emerald cut and the like. The size of the diamond particles is not particularly limited as long as it is a size that can be fixed to a fixing base when ions are irradiated. When diamond particles are small, the pattern to be drawn may be reduced accordingly.

  When the production method according to the present invention is used, the cut surface of the diamond particles is colored and / or patterns such as letters and marks are applied. In the present invention, coloring means coloring the cut surface of the diamond particles, and in the present invention, the pattern means an identification number, a maker mark (symbol), a maker logo (continuous characters), other small patterns and symbols. Means. The cut surface to be colored or patterned may be any surface such as a table, star facet, bezel facet, upper girdle facet, lower girdle facet, pavilion facet, girdle and the like. The cut surface to be colored or patterned may be one surface or a plurality of two or more surfaces.

  In order to color the cut surface of the diamond particles by the manufacturing method according to the first aspect of the present invention, the diamond particles are held by a holder, placed at a predetermined position in the ion irradiation chamber of the ion accelerator, and accelerated by the ion accelerator. Irradiate the cut surface. It is preferable that the holder is made of a material having heat resistance of 200 ° C. or higher without deformation such as softening, melting, and vaporization under the conditions when the cut surfaces of the diamond particles are irradiated with ions. Specifically, stainless steel, platinum, titanium, titanium alloy, magnesium alloy, aluminum, aluminum alloy, and the like can be given. Alternatively, the diamond particles may be set on a noble metal base such as a ring.

  As the ion accelerator used in the present invention, a commercial ion irradiator (implanter) can be used. Commercial ion accelerators include a cesium sputter ion source and a Cockcroft-Walton ion accelerator using a tandem accelerator tube (see FIG. 1 described later). These ion accelerators place a powdery raw material on an ion source to generate target ions. Impurity ions derived from impurities contained in the raw material are bent by 90 degrees by the mass separation electromagnet, Separate impurity ions. Depending on the magnetic force set in the electromagnet for mass separation, ions that are lighter than the target ions bend over 90 degrees, and ions that are heavier than the target ions show a property that the angle of bending is less than 90 degrees. Can be separated.

  The ion acceleration energy when irradiating ions to the cut surface of diamond particles penetrates into the inside of a few micrometers from the surface of the cut surface, and the surface into which this ion penetrates is the type of ion, ion irradiation energy, ion irradiation Color depending on the amount. The acceleration energy for irradiation is selected in the range of 1 to 5 MeV. When the ion acceleration energy is less than 1 MeV, the ion penetration (arrival) depth from the cut surface is shallow, and the diamond cut surface is insufficiently colored. When the ion acceleration energy exceeds 5 MeV, the diamond particles are heated at the time of irradiation. Neither is desirable. For example, when the temperature of the diamond particles exceeds 500 ° C., the diamond particles react with a small amount of oxygen remaining in the irradiation chamber, and the diamond particle surface is likely to be oxidized. Further, when the diamond particles are set on a pedestal made of noble metal, it is not preferable because the temperature of the diamond particles is close to 1000 ° C., since it becomes close to the melting point of the pedestal metal and the apparatus becomes large and the cost increases.

The ion irradiation dose is selected in the range of 1 × 10 ¹² to 1 × 10 ¹⁵ ions / cm ² . When the ion irradiation amount is less than 1 × 10 ¹² ions / cm ² , the ion irradiation amount is insufficient, coloring of the cut surface of the diamond particles becomes insufficient, and the ion irradiation amount is 1 × 10 ¹⁵ ions / cm ^2. If it exceeds 1, the ratio of the diamond crystal becoming graphitized or amorphized increases, it becomes only black and it becomes difficult to color in various colors, which is not preferable.

When irradiating ions accelerated by an ion accelerator onto the cut surface of diamond particles, the degree of vacuum is selected in the range of 10 ⁻³ to 10 ⁻⁴ Pa. This is because if the degree of vacuum is less than 10 ⁻³ Pa, the ion flying force is weak, and if the degree of vacuum is low, not only can ions not be accelerated, but also a high voltage is applied and there is a risk of discharge. In addition, if there is a large amount of residual gas in the ion irradiation chamber, it enters the cut surface of the diamond particles together with the accelerated target ions, so that it is colored in the color of the residual gas ions other than the target ions. When the degree of coloring vacuum exceeds 10 ⁻⁴ Pa, baking of the irradiation chamber (operation for increasing the degree of vacuum by heating) and the like are necessary, and it takes time to replace the sample, which is not preferable.

  Examples of ions that can be irradiated include ions such as gold (Au), silicon (Si), carbon (C), and boron (B). The concentration of the color imparted to the cut surface of the diamond particles can be easily changed by changing the intensity of the ion acceleration energy, the ion irradiation amount, and the like. For example, Au ions are light brown to brown to black, Si ions are dark green to light green, C ions are green to light green, and B ions are yellow green to light yellow green (see Table 1 in Examples described later). ). According to the production method of the present invention, only the irradiated cut surface is colored by irradiating the cut surface of the diamond particle with ions, but the cut diamond particle has a plurality of cut surfaces, and thus is complicatedly reflected. As a result, the diamond particles greatly increase the commercial value of jewelry.

  According to the second aspect of the present invention, after the cut surface of the diamond particle is coated with a mask or a photoresist in which holes are perforated into a shape such as letters or marks (see FIGS. 3 and 4 to be described later), As in the first invention described above, diamond particles are held by a holder and held in an ion irradiation chamber of an ion accelerator, and ions accelerated by the ion accelerator are irradiated onto the cut surface from the drilled holes. A pattern is applied to the cut surface following the pattern of a hole drilled in a mask or a photoresist (see FIGS. 5 and 6 to be described later).

  The material that can be used as a mask is preferably made of a material that has a heat resistance of 200 ° C. or higher without deformation such as softening, melting, and vaporization under the conditions when the diamond particle cut surface is irradiated with ions. Specific examples include aluminum, stainless steel, silicon, magnesium, titanium, and platinum. If the thickness of the mask is too thin, the ion transmission cannot be shielded, so that the mask is sufficiently thick to shield the ion transmission. Depending on the material, a thickness of several tens of micrometers or more is preferable.

  As a method of drilling holes by processing the mask into letters or marks, laser processing, ion beam processing, electron beam processing, cutting, electrolytic processing, electrical discharge processing, etching, etc. Can be mentioned. For the hole drilling method, a processing method may be selected depending on the material of the mask and the size of the pattern to be formed. Any photoresist can be used as long as it can withstand the temperature during ion irradiation and can adhere to the surface of diamond particles. Photoresist materials having such properties differ depending on the light source employed for exposure of the photoresist. When the exposure light source is ultraviolet, an ultraviolet resist containing cyclized rubber and bisazide, an ultraviolet resist containing a diazoquinone compound, and the like can be given. When the exposure light source is an electron beam, an electron beam resist containing polymethyl methacrylate (PMMA), an electron beam resist containing polyhexafluorobutyl methacrylate (FBM), and an electron beam containing polyhexafluoropropyl methacrylate (FPM) A resist etc. are mentioned. When the exposure light source is X-ray, X-ray resist containing PMMA, X-ray resist containing FBM, and the like can be mentioned. As a method of punching holes by processing letters or marks in photoresist, the resist is coated on diamond particles, holes are drilled through the exposure and development processes, and ions are irradiated (implanted) from the drilled holes. And draw a desired pattern on the diamond particle cut surface.

  The ion source (apparatus) that can be used when carrying out the second invention according to the present invention may be the same as that used in the first invention, and the type of ions, ion irradiation intensity, degree of vacuum at the time of ion irradiation, etc. Moreover, it may be the same as described in the first invention. Patterns such as letters or marks colored in a desired color can be drawn on the cut surface by ions passing through holes formed in the mask or photoresist.

  Next, an outline of a method for producing colored diamond particles by the method according to the present invention will be described. FIG. 1 is a schematic view of an example of an ion accelerator used in the manufacturing method according to the present invention. The ion accelerator 1 includes a cesium sputtering ion source 2, an extraction electrode 3, a mass separation electrode 4, a tandem acceleration tube 5, an energy separation electromagnet 6, a scanning electrode 7, a neutral / ion separation electrode 8, and an irradiation chamber 9. The diamond particle fixture 10 is constituted.

  In FIG. 1, ions generated from the cesium sputter ion source 2 are negative ions, and the ion source is a powder of the material exemplified above, and has an average particle size of several tens to several hundreds of micrometers. Things are used. In FIG. 1, the arrow indicates the direction of ion transfer (travel, transport). Negative ions are guided to the mass separation electrode 4 by the extraction electrode 3 with an acceleration energy of about 20 keV. The impurity ions contained in the introduced negative ions are separated here, and only the target ions are separated and transferred to the tandem accelerator tube 5. The central part of the tandem type acceleration tube 5 is a positive electrode, and negative ions are accelerated to the central part. The voltage that can be applied at the center is in the range of 100 kV to 1.7 MV. The ions converted into positive ions at the center of the tandem accelerator tube 5 are further accelerated and transferred toward the end of the tandem accelerator tube 5. The positive ions may include a plurality of ions having different valences, and each has a different acceleration energy. Therefore, the positive ions are separated into single acceleration energy by the energy separating electromagnet 6 and become a uniform beam by the scanning electrode 7. It is scanned and irradiated to the cut surface of the diamond particles installed in the irradiation chamber 9.

  FIG. 2 is a schematic side view showing an example of a state in which diamond particles are fixed to a fixture and irradiated with ions based on the first invention. In FIG. 2, the brilliant-cut diamond particles 12 are fixed to the opening of the diamond particle fixture 11 by exposing only the table surface to the ion irradiation port. The high energy ions 13 are applied to the table surface from the opening of the diamond particle fixture 11 and only the table surface is colored.

  FIG. 3 is a schematic side view showing an example of producing diamond particles having a pattern colored on the cut surface based on the second invention, and FIG. 4 is colored on the cut surface based on the second invention. FIG. 5 is a schematic side view showing another example of producing diamond particles having a pattern, FIG. 5 is a plan view of an example of diamond particles with a picture drawn on the cut surface, and FIG. 6 is a character on the cut surface. FIG. 3 is a schematic side view of an example of a diamond particle on which is drawn.

  In FIG. 3, 14 is diamond particles, 15 is a mask for shielding high energy ions, and 16 is high energy ions. In FIG. 4, 17 is a diamond particle, 18 is a photoresist layer which shields high energy ions, and 19 is high energy ions. FIG. 5 is a heart-shaped pattern formed on the table surface 20, FIG. 6 is a character formed on the girdle part 21, and FIG. 7 is an enlarged view of the character part of FIG.

EXAMPLES Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not limited to the following description examples, unless the meaning is exceeded. In the examples described below, the xy chromaticity of the sample after ion irradiation was measured as follows.
1. Measurement method of xy chromaticity: D65 standard light source and color luminance meter (manufactured by Konica Minolta Co., Ltd.) in accordance with “JIS 7816 (1991), a regular light source fluorescent lamp D65 used for comparison of surface color, D65-type and performance”. Model: CS-220) was prepared, white light from a standard light source was applied to the colored cut surface of the diamond particles prepared according to the following examples, and the reflected light was measured with a color luminance meter. The same sample was measured three times, and the average value was calculated.

[Example 1]
Brilliant-cut melee diamond particles having a maximum diameter of about 1 mm were fixed to an aluminum fixture having a structure as shown in FIG. This was arrange | positioned in the irradiation chamber 9 of the ion accelerator shown in FIG. Gold (Au) powder (average particle diameter: about 600 micrometers) is placed in the cesium sputter ion source 2 of FIG. 1, the acceleration energy is constant at 3 MeV, and the ion irradiation dose is 1 × 10 ¹² to 1 × 10. Ions were irradiated at a temperature of ¹⁵ ions / cm ² , the diamond particle temperature was 200 ° C., and the degree of vacuum was 10 ⁻⁴ Pa, and the relationship between the ion irradiation amount and coloring was examined. The results are shown in Table-1. As for the obtained sample, those with a small amount of ion irradiation exhibited a light brown color, and those with a large amount of ion irradiation exhibited a black color.

[Example 2]
In the example described in Example 1, the sample placed in the ion source was changed to silicon (Si) powder (average particle diameter: about 650 micrometers), the acceleration energy was constant at 3 MeV, and the ion irradiation dose was 1 ×. Ion irradiation was performed at a temperature of 10 ^{13 to} 5 × 10 ¹⁴ ions / cm ² , a diamond particle temperature of 200 ° C., and a degree of vacuum of 10 ⁻⁴ Pa, and the relationship between the ion irradiation amount and coloring was examined. The results are shown in Table-1. As for the obtained sample, those with a small amount of ion irradiation exhibited a light green color, and those with a large ion irradiation exhibited a dark green color.

[Example 3]
In the example described in Example 1, the sample put into the ion source was changed to carbon (C) powder (average particle size: 700 micrometers), the acceleration energy was constant at 3 MeV, and the ion irradiation dose was 1 × 10. Irradiation was performed in the range of ^{13 to} 5 × 10 ¹⁴ ions / cm ² , and the diamond particle temperature was 200 ° C. and the degree of vacuum was 10 ⁻⁴ Pa, and the relationship between the ion irradiation amount and coloring was examined. The results are shown in Table-1. As for the obtained sample, those with a small amount of ion irradiation exhibited a light green color, and those with a large ion irradiation exhibited a dark green color.

[Example 4]
In the example described in Example 1, the sample put in the ion source was changed to boron (B) powder (average particle size: 650 micrometers), the acceleration energy was constant at 3 MeV, and the ion irradiation dose was 1 × 10. Irradiation was performed in the range of ^{13 to} 5 × 10 ¹⁴ ions / cm ² , and the diamond particle temperature was 200 ° C. and the degree of vacuum was 10 ⁻⁴ Pa, and the relationship between the ion irradiation amount and coloring was examined. The results are shown in Table-1. As for the obtained sample, those with a small amount of ion irradiation exhibited a light yellowish green color, and those with a large amount of ion irradiation exhibited a yellowish green color.

From Table 1, the following becomes clear.
1. Even if the ion source is the same, the color of the product obtained can be changed by selecting (changing) the ion irradiation amount.
2. Even if the ion source is the same, the color becomes darker when the ion irradiation amount is increased.

  According to the production method of the present invention, colored diamond particles having a low commercial value can be colored to produce colored diamond particles having a high commercial value as jewelry, and any pattern can be drawn on the cut surface of the diamond particles. This makes it possible to produce jewelry with high commercial value and an original design that has never been seen before. In addition, according to the manufacturing method of the present invention, it is possible to easily draw patterns such as numbers and letters on the cut surface of diamond particles, so that it is possible to draw an identification number, manufacturer logo, and manufacturer mark on diamond particles. Since these drawings can be easily distinguished from fake brands, customer confidence in diamond particles can be increased.

It is the schematic of an ion accelerator. It is a schematic side view showing an example of a state in which diamond particles are fixed to a fixture and irradiated with ions. It is a schematic side view showing an example of manufacturing diamond particles having a pattern colored on a cut surface. It is a side surface schematic diagram which shows the other example at the time of manufacturing the diamond particle which has the pattern colored on the cut surface. It is a top view of an example of the diamond particle by which the picture was drawn on the cut surface. It is a schematic side view of an example of diamond particles with characters drawn on the cut surface. It is an enlarged view of the character formed in the girdle part.

Explanation of symbols

1: ion accelerator 2: cesium sputter ion source 3: extraction electrode 4: electromagnet for mass separation 5: tandem accelerator 6: electromagnet for energy separation 7: scanning electrode 8: electrode for neutral / ion separation 9: irradiation chamber 10 11: Diamond particle fixtures 12, 14, 17: Diamond particles 13, 16, 19: High energy ions 15: Mask 18: Photoresist layer 20: Heart-shaped pattern 21: Number pattern

Claims (4)

In the method for producing diamond particles with colored cut surfaces, the cut surfaces of the diamond particles to be colored are subjected to an ion accelerator in a temperature range of room temperature to about 200 ° C. under a vacuum atmosphere of 10 ⁻³ to 10 ⁻⁴ Pa. A diamond particle colored cut surface, characterized by irradiating high energy ions with acceleration energy in the range of 1 to 5 MeV and ion dose in the range of 1 × 10 ¹² to 1 × 10 ¹⁵ ions / cm ² . Production method.   The production of diamond particles with colored cut surfaces according to claim 1, wherein the type of color to be colored and the shade of the color after coloring are changed by changing the type of ion to be irradiated and changing the amount of ion irradiation. Method. In a method of manufacturing diamond particles having a pattern drawn on a cut surface, the diamond particle cut surface is coated with a mask or a mask made of a photoresist or a mask with holes or holes formed in a shape such as letters or marks. In the vacuum range of 10 ⁻³ to 10 ⁻⁴ Pa, the acceleration energy is in the range of 1 to 5 MeV and the ion irradiation amount is 1 × 10 ¹² to 1 × 10 ¹⁵ ions / A method for producing diamond particles having a pattern drawn on a cut surface, wherein high energy ions in a range of cm ² are irradiated. The diamond particles having a pattern drawn on a cut surface according to claim 3, wherein the type of ion to be irradiated and the amount of ion irradiation are changed to change the type of pattern color to be drawn and the density of the pattern after drawing. Manufacturing method.

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