JP2003001514A - Method for processing photo-transmitting surface of rod shape photo-transmitting body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a rod shape photo-transmitting body having a smooth photo-transmitting surface and an excellent optical property at low cost and good productivity. SOLUTION: In such a processing method that ends of respective rod shape photo-transmitting bodies are cut by moving at least either a photo-transmitting body array, in which a plurality of rod shape photo-transmitting bodies are arranged in parallel with each other, or a cutting blade, so that the end of each rod shape photo-transmitting body of the photo-transmitting body array abuts against the tip of the cutting blade, the end of each rod shape photo- transmitting body is cut a plurality of times with the depth of cut smaller than 1 μm at one time of the abutment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating an optical transmission surface of a rod-shaped optical transmission body.

[0002]

2. Description of the Related Art Conventionally, mirror finishing of a light transmitting surface of a light transmitting body such as an optical fiber or a rod-shaped lens is carried out after primary processing such as cutting, followed by (a) rough polishing using coarse abrasive grains and sequentially Polishing method for performing final polishing instead of fine polishing material, (b) coating method for applying transparent resin to the polished surface after rough polishing by spraying or dipping, and hardening treatment, (c) rotation with diamond cutting blade attached Diamond milling method for cutting with a milling method using a head (Japanese Patent Laid-Open No. 9-152518), (d) Diamond planner method for cutting with a planer method in which a diamond cutting blade and an optical transmission body are relatively moved (Japanese Patent Laid-Open No. H11-11511). -1
56628) and the like.

[0003]

However, in the polishing method (method a) in which the abrasive grains of the abrasive material are sequentially changed from coarse ones to finer ones, the optical transmission surface usable as an optical component is finished. Therefore, it is necessary to use very fine abrasive grains having a grain size of 0.5 μm or less in the final stage final polishing. Moreover, the abrasive having a relatively large particle size used in the previous polishing step tends to remain, and the remaining abrasive particles may cause scratches on the optical transmission surface during the final polishing. Therefore, when polishing with fine abrasive grains,
It is necessary to completely remove the abrasive used for the previous polishing,
As a result, there is a problem that the whole processing and apparatus become complicated and the productivity becomes low.

On the other hand, in the coating method (method b), scratches remaining after rough polishing can be filled with a coating material to finish the surface state usable as an optical component. At that time, the rough polishing has a grain size of 3 μm. Polishing with a certain degree of abrasive grains is sufficient, and the productivity is high as compared with the above polishing method (method a). However, when there is a difference in the refractive index between the material forming the optical transmission body and the coating material, light is refracted or scattered at the scratched portion. In addition, irregularities on the optical transmission surface due to foreign matter adhering to the coating material during coating processing, irregularities on the optical transmission surface before coating, and defective adhesion of the coating material due to repellency of the coating material on the optical transmission surface may occur. However, there is a problem in that the optical properties are likely to deteriorate as compared with the polishing method (method a).

In the diamond milling method (method c),
Knife marks and undulations are likely to occur on the optical transmission surface, and fluctuations in the cutting state due to rattling of the optical transmission component feed section, eccentricity of the rotating shaft, and the like are compounded, and the quality of the finished surface is likely to deteriorate. Furthermore, in order to reduce the number of knife marks on the optical transmission surface, it is necessary to repeatedly cut the optical transmission surface with a small amount of feed, and the cutting distance reaches several tens to several hundred times the total length of the optical transmission surface. Therefore, there is a problem that the wear of the cutting edge progresses very quickly, the life of the diamond cutting blade is shortened, and the cost is increased.

With the diamond planner method (method d), it is possible to treat the optical transmission surface of a general-purpose optical transmission body with high productivity, but minute cracks are likely to occur during cutting, and high performance applications are possible. However, there is a problem in that it is difficult to apply to the processing of the optical transmission surface of the optical transmission body.

Therefore, an object of the present invention is to provide an optical transmission surface treatment method capable of producing a rod-shaped optical transmission body having a smooth optical transmission surface and having excellent optical characteristics at low cost and with high productivity.

[0008]

According to the present invention, an end portion of each rod-shaped light transmission body of an optical transmission body array in which a plurality of rod-shaped light transmission bodies are arranged in parallel with each other is brought into contact with a cutting edge of a cutting blade. As described above, in the optical transmission surface treatment method for a rod-shaped optical transmission medium, which moves at least one of the optical transmission medium array and the cutting blade to cut the end of each rod-shaped optical transmission medium, The present invention relates to a method for treating an optical transmission surface of a rod-shaped optical transmission body, wherein the rod-shaped optical transmission body is cut a plurality of times with a cutting amount of 1 μm or less per contact with one end of the rod-shaped optical transmission body.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The treatment method of the present invention is applied to a surface treatment of an end face of a rod-shaped light transmission body, that is, a light transmission plane (a surface cut out perpendicularly to the light transmission direction (longitudinal direction of the rod-shaped light transmission body)). It is preferable, in particular, an optical end face of an array of optical transmission bodies (hereinafter, appropriately referred to as “lens array”) in which a plurality of rod-shaped optical transmission bodies are arranged in parallel between two substrates (optical transmission surface of rod-shaped optical transmission body It is suitable as a finishing treatment for the exposed end surface). Although the rod-shaped light transmission body is made of various transparent materials, the present invention can obtain an excellent effect particularly on a plastic rod-shaped light transmission body.

The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an apparatus suitable for simultaneously processing both optical end faces of a lens array. Figure 1
Inside, 1 is a lens array body, 2 is a lens array body fixing unit, 3 is a fixed pedestal (shank) on which the single crystal diamond cutting blade 3a is installed, 4 is a cutting blade micro-moving unit, and 5 is preliminary cutting. A blade moving unit, 6 is a cutting blade lifting unit, and 7 is a lens array fixing unit moving guide.

FIG. 2 shows an example of a lens array processed by the optical transmission surface processing method of the present invention. In FIG. 2, 21 is a rod-shaped light transmission body (lens), 22 is a substrate, and 23 is an adhesive curing portion. The lens array can be formed by arranging a plurality of rod-shaped light transmission bodies 21 in parallel with each other between two substrates 22 and fixing them with an adhesive. For example, after arranging the rod-shaped optical transmission elements in parallel between two substrates 22 such as a resin plate made of phenol resin or acrylic resin or a non-ferrous metal plate made of copper or brass,
A liquid adhesive may be filled in the gap between the substrate 22 and the rod-shaped light transmission body 21, the liquid adhesive may be cured, and then, if necessary, the rod-shaped light transmission body may be cut perpendicularly to the longitudinal direction to form a predetermined size. .

FIG. 3 shows an example of a single crystal diamond cutting blade used in the optical transmission surface treatment method of the present invention. 3 in FIG.
1 is a cutting blade fixed pedestal (shank), 32 and 33 are single crystal diamond tips (cutting blades) having a linear cutting edge,
Reference numeral 34 indicates a cutting edge. In FIG. 3, the cutting blade is composed of two single crystal diamond chips, but it can be composed of one single crystal diamond chip.

In the apparatus shown in FIG. 1, a lens array body 1 in which a plurality of rod-shaped transmission bodies are arranged in parallel is fixed by a clamp of a lens array body fixing unit 2. The end of the lens array 1 fixed in this way on the optical end face side is preferably precut, and then a single crystal diamond cutting blade 3a whose cutting position is adjusted by the fine cutting blade fine moving unit 4 is used. Cutting (finish cutting),
This cutting is performed multiple times.

In this finishing cutting, the lens array 1 is fixed so that its optical end face projects from the side surface of the lens array fixing unit 2, and each rod-shaped optical transmission member of the lens array 1 fixed in this way. The cutting position of the single crystal diamond cutting blade 3a is adjusted by the fine moving unit 4 so that the edge of the single crystal diamond cutting blade 3a sequentially contacts the end of the. At that time, it is preferable to install the cutting blade so that the blade edge comes into contact with the end surface of the rod-shaped light transmission body as perpendicularly as possible. Further, as the cutting blade minute moving unit 4, a cutting blade movable stage having a piezo element as a cutting blade moving driving body for adjusting the cutting position of the cutting blade with respect to the end portion of each rod-shaped light transmission body can be used. . By using such a cutting blade movable stage, the position of the cutting edge can be controlled with high accuracy, and since the response speed is fast, the positioning of the cutting edge can be performed quickly. As such a cutting blade movable stage, for example, a stage provided with a laminated piezoelectric actuator (stage driver), a displacement sensor and a control unit can be used. A laminated piezoelectric actuator converts electrical energy into mechanical displacement energy, and is compatible with a wide range by stacking piezoelectric ceramic elements.For example, a capacitive displacement sensor is built into the driver to provide a closed By performing the servo loop control, highly accurate position control on the order of nm can be performed.

Next, the lens array 1 fixed to the fixing unit 2 is moved along the moving guide 7 with respect to the single crystal diamond cutting blade 3a to cut the end portion of each rod-shaped optical transmission body. . After each rod-shaped transmitter of the lens array 1 has completely passed through the contact position with the single crystal diamond cutting blade 3a and the cutting is completed, the single crystal diamond cutting blade 3a is brought into contact with the cutting surface of the lens array 1. After retracting so as not to do so, the lens array 1 is moved along the guide 7 and returned to the original position. Then, after adjusting the cutting position of the single crystal diamond cutting blade 3a for the next cutting, the next cutting is performed.

By performing the above-mentioned finishing cutting operation a plurality of times to repeatedly cut the end portion of each rod-shaped light transmission body, the end surface of each rod-shaped light transmission body is made into a smooth mirror surface state, for example, JIS.
The surface roughness Ra measured according to B0601 is 0.1 μm.
It can be m or less.

As shown in FIG. 1, when the cutting blades 3a are provided on both sides of the passing position of the lens array body 1, the lens array body 1 is passed once between the cutting blades 3a so that the lens array body 1 is passed.
Both ends of the can be cut.

Further, in FIG. 1, the cutting blade 3a is fixed and the optical transmitter array 1 is moved along the moving guide 7. However, even if the optical transmitter array 1 is fixed and the cutting blade 3a is moved. Good. It is also possible to move both the lens array 1 and the cutting blade 3a so as to face each other to improve the cutting speed.

Cutting blade 3a for finishing cutting
The relative movement speed of the lens array 1 with respect to is preferably 100 mm / sec or more, more preferably 500 mm / sec or more, from the viewpoint of productivity and obtaining a cut surface with sufficient flatness.
800 mm / sec or more is more preferable. By increasing the relative movement speed of the lens array 1 with respect to the cutting blade 3a, productivity can be improved and the flatness of the cutting surface can be increased. For example, by setting the relative movement speed to 1000 mm / sec or more, it is more excellent. The flatness can be formed with high productivity. As a device for moving the lens array and the cutting blade at high speed, a bearing which is usually interposed between the lens array fixing unit and the moving guide (or between the cutting blade moving unit and the moving guide) is used. A moving device provided with a linear motor type actuator that does not have a rotating part such as a roller and can perform extremely high acceleration / deceleration can be used.

When performing the pre-cutting, as shown in FIG. 1, a pre-cutting blade, a unit 5 or the like can be separately provided to perform the pre-cutting. It is also possible to change the cutting position of the cutting blade by using the unit 4 and the like.

Although not shown in FIG. 1, another set of a fine moving unit for finishing cutting blades and a moving unit for preliminary cutting are arranged between the moving unit 5 and the fixed unit 2 and arranged in mirror symmetry to reciprocate. It is possible to reduce the processing time by cutting with.

In the method of the present invention, as described above, a single crystal diamond cutting blade having a linear cutting edge is used, and this cutting edge and the end portion of each rod-shaped optical transmission member forming the lens array are arranged. The end faces of the rod-shaped optical transmission members are cut by sequentially contacting each other in order, and this cutting process is performed a plurality of times. At that time, the cutting amount per contact between the blade edge and the end portion of each rod-shaped light transmission body, that is, the thickness of the light transmission body cut out by one cutting is 1 μm or less, preferably 0.6 μm or less, More preferably, it is set to 0.4 μm or less. If the cut amount exceeds 1 μm, it becomes difficult to obtain an optical transmission surface having a desired flatness. On the other hand, the depth of cut per contact is preferably 0.05 μm or more, more preferably 0.1 μm or more. If the cut amount is too small, it is necessary to increase the number of cutting processes in order to obtain the desired flatness, and the productivity is reduced. In addition, in one cutting process (once contact),
Depending on the accuracy of movement of the cutting position of the cutting blade and the flatness of the end surface before cutting, it is not possible to obtain an optical transmission surface having a desired flatness.

Before the cutting (finish cutting) of the present invention,
If the flatness of the end face of the rod-shaped light transmission body is low or the warp is severe, use a cutting blade or device for finish cutting or a separately provided cutting blade or device for preliminary cutting before performing finish cutting. The cutting amount per contact is 10
The preliminary cutting treatment of about 100 μm to 100 μm may be performed once or plural times. Alternatively, the pre-cutting process may be performed using a general cutting tool such as a milling cutter or an end mill.

The flatness of the end face of the rod-shaped optical transmission body before finish cutting is the surface roughness R measured according to JIS B0601.
The value of a is preferably 2 μm or less, more preferably 1.5 μm or less. The preliminary cutting process is performed to improve the flatness of the end surface of the rod-shaped light transmission body, and then the finishing cutting process is performed, whereby the number of finishing cutting processes can be reduced.

As the cutting blade for pre-cutting, a cutting blade made of various superhard materials may be used, but a polycrystalline diamond cutting blade excellent in cost performance is preferable from the viewpoints of machinability, service life, price and the like. A single-crystal diamond cutting blade is preferable from the viewpoints of machinability and life. Also,
The pre-cutting is not limited to the one using the fixed cutting blade as shown in FIG. 1, but a rotary cutting tool such as an end mill may be used. Is not particularly limited.

FIG. 3 shows an example of a preferred embodiment of the cutting blade for finish cutting. In this cutting blade for finish cutting, two single-crystal diamond tips 32, 33 having a linear cutting edge 34 are attached to one cutting blade fixing base (shank) 31, and these cutting edges 34 are arranged on a straight line. It is arranged. By arranging the cutting edges 34 of the single crystal diamond tips 32 and 33 in a straight line, highly accurate polishing becomes possible. Three or more single crystal diamond tips each having a linear cutting edge may be provided so that the cutting edges are arranged in a straight line. In order to make the uncut area as small as possible, the distance between adjacent cutting blades (tips) is preferably as small as possible, preferably 50 μm or less, more preferably 20 μm or less, and more preferably 10 μm.
The following is particularly preferable.

The larger the size of diamond, the more exponentially the price increases, so that the width of the diamond cutting blade which is industrially used is usually 11 mm or less. When a cutting blade composed of such a small single crystal diamond tip is used, the width of the light transmission surface that can be cut at one time is equal to or less than the length of the cutting edge, and in order to process a wide light transmission surface, It becomes necessary to repeat the cutting process many times. On the other hand, it is possible to efficiently cut a wide optical transmission surface by using a cutting blade in which two or more diamond cutting blades (tips) having a linear cutting edge are installed on one cutting blade fixing base. You can

It is composed of a plurality of diamond tips,
When cutting is performed using the above-mentioned cutting blades whose cutting edges are arranged on a straight line, uncut portions may occur due to the gap (interval between cutting blades) at the joint between adjacent chips. There is no problem when using a cutting blade with no gap between chips or a very small gap, but when using a cutting blade with a gap between chips to some extent, it is necessary to cut the uncut portion after the first cutting. By using a cutting blade moving device such as the cutting blade lifting unit 6, the cutting blade is moved in the linear direction of the cutting edge beyond the size of the gap between the chips, and the cutting position is not changed in the same manner as the first cutting. It is preferable to perform the second cutting. Even if the number of diamond tips constituting the finishing cutting blade is three or more, a plurality of uncut portions can be simultaneously cut by the second finishing cutting.

In this embodiment, the smoothness of the optical transmission surface is enhanced, and preferably the optical transmission surface is JIS B0601.
A single crystal diamond cutting blade, which is the most preferable cutting blade, is used as the cutting blade 3a in that it can be formed into a mirror surface state having a surface roughness Ra of 0.1 μm or less, which is measured according to. However, when the smoothness of the light transmission surface is not so high, it is possible to use a cutting blade made of another material such as polycrystalline diamond.

Further, since the light transmission surface of the rod-shaped light transmission body is usually formed in a flat shape, the one having a linear cutting edge has been described as the cutting blade. However, depending on the desired shape of the light transmission surface, other It is also possible to use a cutting blade having a cutting edge in the shape of.

By the method as described above, the light transmission surface of the rod-shaped light transmission body can be formed smoothly, preferably in a mirror-like state having a flatness of a surface roughness Ra of 0.1 μm or less measured according to JISB0601. It is possible to obtain a smooth optical transmission surface, preferably an optical transmission surface having optical characteristics equivalent to those of the polishing method, while significantly simplifying the processing steps as compared with the polishing method and the coating method. Further, it is possible to manufacture a rod-shaped optical transmission body and a lens array which can be applied to high-performance applications which were difficult to form by a normal diamond plane method.

[0033]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 First, a master plate for an array of optical transmission elements (optical transmission element array original plate) was manufactured as follows. A black phenol resin substrate was prepared as a substrate, and a plastic rod-shaped lens (hereinafter abbreviated as "rod-shaped lens" or simply "lens") was prepared as an optical transmission body. A plurality of rod-shaped lenses were arranged in parallel between the two substrates, and subsequently, an adhesive was filled in the gap between the substrates and the rod-shaped lenses. As this adhesive, a reactive epoxy adhesive (trade name: Epiform,
2% by mass of carbon black was kneaded with (Somal). Next, the filled adhesive was cured to obtain an optical transmission element array original plate having a structure in which a plurality of rod lenses were arrayed in parallel between two substrates.

Next, the original plate for the optical transmission medium is cut perpendicularly to the longitudinal direction of the lens (optical transmission direction), and the width (length of the longitudinal direction of the lens) 4.5 mm as shown in FIG. A strip-shaped lens array was obtained.

Next, in the apparatus shown in FIG. 1, the strip-shaped lens array 1 was fixed by a clamp. At that time, the lens array 1 was fixed so that the optical end faces of both sides protruded from the side faces of the fixed unit 2 by about 0.5 mm.

As the cutting blade 3a of the apparatus shown in FIG. 1, two single crystal diamond tips each having a linear cutting edge for both pre-cutting and finish cutting have straight cutting edges as shown in FIG. The one arranged so as to be located at was used. At this time, the distance between adjacent chips was set to 10 μm.

Next, the positions of the opposing cutting blades for pre-cutting were adjusted by the moving unit 5 so that the cutting depth was 100 μm on one side. Then, the lens array fixing unit 2 was passed between the cutting blades for preliminary cutting at a moving speed of 500 mm / sec.

In order to cut the uncut portion by the joint between the two diamond chips constituting the cutting blade, the cutting blade elevating unit 6 moves the cutting blade position upward by 100 μm, and then the lens array fixing unit 2 is again moved at the same speed. Fifty
It was passed between the cutting blades for preliminary cutting at 0 mm / sec. By the above first preliminary cutting, the width of the lens array 1 is 4.3 m.
m.

Next, the positions of the opposing cutting blades for the preliminary cutting were adjusted by the moving unit 5 so that the cutting depth was 48 μm on one side. After that, the second preliminary cutting was performed in the same manner as the first preliminary cutting, and the width of the lens array was 4.204 mm and the surface roughness Ra of the cut surface was 1.5 μm or less.

The positions of the opposing cutting blades for finish cutting of the lens array preliminarily cut as described above were adjusted by the fine moving unit 4 so that the cutting amount was 1.0 μm on each side. As the minute moving unit, one having a driving device using a piezo element was used. Then, the lens array fixing unit 2 was passed between the cutting blades for finish cutting at a moving speed of 800 mm / sec. Subsequently, the cutting blade elevation unit 6 moves the cutting blade position upward by 100 μm, and then the lens array fixing unit 2 is again moved at the same speed 80.
It was passed between the cutting blades for finish cutting at 0 mm / sec. The same operation was repeated four times, and the initial cutting and the subsequent cutting of the uncut portion were performed once as a single cutting treatment to perform a total of five finishing cutting treatments.

Regarding one of the plurality of lenses constituting the obtained lens array, a light transmission surface (cutting surface)
The surface roughness Ra and the MTF (12 line pairs / mm) of the optical characteristics were measured. The measurement results are shown in Table 1. Incidentally. M
TF stands for Modulation Transfer F
Abbreviation of unction, which is generally used as a value representing the resolution of a lens.

[Embodiment 2] A lens array body was manufactured in the same manner as in Example 1, and the optics of the lens array body was manufactured in the same manner as in Example 1 except that the cut amount on one side was 0.4 μm by finish cutting. The end face was processed to obtain a lens array having a width of 4.2 mm.

Regarding one of the plurality of lenses constituting the obtained lens array, a light transmission surface (cutting surface)
The surface roughness Ra and the MTF (12 line pairs / mm) of the optical characteristics were measured. The measurement results are shown in Table 1. The lens of the lens array obtained in this example is confirmed to have improved optical characteristics as compared with the lens obtained in Example 1, and exhibits sufficient performance as an optical transmission body that requires high optical characteristics such as an LED printer. Had.

[Embodiment 3] In this embodiment, in the apparatus shown in FIG. 1, the lens array fixing unit moving guide 7 is used.
As a device for moving the lens array fixing unit 2 along the line, a linear motor type actuator that does not have a rotating portion between the lens array fixing unit 2 and its moving guide 7 and is capable of extremely high acceleration / deceleration is used. Using the provided apparatus, the optical end face of the lens array body was treated in the same manner as in Example 2 except that the moving speed of the lens array body fixing unit 2 was 1200 mm / sec by finish cutting.

Regarding one of the plurality of lenses constituting the obtained lens array, a light transmission surface (cutting surface)
The surface roughness Ra and the MTF (12 line pairs / mm) of the optical characteristics were measured. The measurement results are shown in Table 1. The lens of the lens array obtained in this example is confirmed to have improved optical characteristics as compared with the lens obtained in Example 2, and has sufficient performance as an optical transmission body requiring high optical characteristics such as an LED printer. Had.

Comparative Example 1 In the same manner as in Example 1, a strip-shaped lens array having a width of 4.5 mm was produced, and this array was fixed to the apparatus shown in FIG.

Next, the positions of the facing pre-cutting blades were adjusted by the moving unit 5 so that the cutting depth was 147 μm on each side. Then, the lens array fixing unit 2 was passed between the cutting blades for preliminary cutting at a moving speed of 500 mm / sec. In order to cut the uncut portion by the joint between the two diamond tips constituting the cutting blade, the cutting blade elevating unit 6 moves the cutting blade position upward by 100 μm, and then the lens array fixing unit 2 is again moved at the same speed of 500 mm / sec. Then, it was passed between the cutting blades for preliminary cutting. By the above preliminary cutting, the width of the lens array 1 is set to 4.206.
mm.

Next, final cutting was performed in the same manner as in Example 1 except that the depth of cut on one side was 3.0 μm and the final cutting was performed once to obtain a lens array having a width of 4.2 mm. .

Regarding one lens of the plurality of lenses constituting the obtained lens array, a light transmission surface (cutting surface)
The surface roughness Ra and the MTF (12 line pairs / mm) of the optical characteristics were measured. The measurement results are shown in Table 1.

[0051]

[Table 1]

[0052]

According to the present invention, a rod-shaped optical transmission medium and an optical transmission medium array having a smooth optical transmission surface and excellent optical characteristics can be manufactured at low cost by a simple process. Further, it is possible to manufacture a rod-shaped light transmission body and an array of light transmission bodies which can be applied to high-performance uses which were difficult to form by the conventional diamond plane method. Furthermore, since the relative moving speed of the array of light transmitters with respect to the cutting blade can be made as high as that of the diamond milling method, the productivity can be significantly improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an example of an apparatus used in the optical transmission surface treatment method of the present invention.

FIG. 2 is a diagram showing an example of a rod-shaped optical transmission body array processed by the optical transmission surface processing method of the present invention.

FIG. 3 is a diagram showing an example of a single crystal diamond cutting blade used in the optical transmission surface treatment method of the present invention.

[Explanation of symbols]

1 lens array 2 Lens array fixing unit 3 Cutting blade fixed base (shank) 3a Single crystal diamond cutting blade 4 Cutting blade fine movement unit for finishing 5 Cutting blade moving unit for preliminary cutting 6 Cutting blade lifting unit 7 Lens array fixing unit moving guide 21 Rod-shaped optical transmitter (lens) 22 Substrate 23 Adhesive curing part 31 shank 32, 33 Single crystal diamond tip (cutting blade) 34 cutting edge

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kei Saeki             20-1 Miyuki-cho, Otake-shi, Hiroshima Mitsubishi Rayo             Central Technology Research Institute F-term (reference) 2H038 CA22                 3C050 AB01 AC02

Claims (9)

[Claims] 1. An optical transmission medium array such that the ends of the rod-shaped optical transmission mediums of the optical transmission medium array in which a plurality of rod-shaped optical transmission mediums are arranged in parallel with each other are in contact with the cutting edge of the cutting blade. In the optical transmission surface treatment method of the rod-shaped light transmission body, which moves at least one of the body and the cutting blade to cut the end portion of each rod-shaped light transmission body, with respect to one end of each rod-shaped light transmission body. The method for treating an optical transmission surface of a rod-shaped optical transmission body is characterized in that cutting is performed a plurality of times with a cutting amount per contact of 1 μm or less. 2. The cutting edge is a single crystal diamond cutting edge having a linear cutting edge.
5. A method for treating an optical transmission surface of a rod-shaped optical transmission body according to. 3. The optical transmission surface treatment method for a rod-shaped optical transmission body according to claim 1, wherein a cutting amount per contact with one end of each rod-shaped optical transmission body is 0.05 μm or more and 1 μm or less. 4. The relative moving speed of the array of light transmitters with respect to the cutting blade is 500 mm / sec or more.
2. The method for treating an optical transmission surface of a rod-shaped optical transmission body according to 2 or 3. 5. The rod-shaped optical transmission according to any one of claims 1 to 4, wherein an optical transmission element array in which an end portion of each rod-shaped optical transmission element is precut is used as the optical transmission element array. Optical transmission surface treatment method of body. 6. The optical transmission element array according to claim 1, wherein the optical transmission element array is an optical transmission element array in which the surface roughness of the end face of each rod-shaped optical transmission element is 2 μm or less. Of the optical transmission surface of the rod-shaped optical transmission body of. 7. A cutting blade movable stage having a piezo element is used as a cutting blade moving driving body for adjusting a cutting position of the cutting blade with respect to an end portion of each rod-shaped light transmission body. The optical transmission surface treatment method for a rod-shaped optical transmission body according to any one of claims 1 to 5. 8. As the cutting blades, two or more single crystal diamond cutting blades having linear cutting edges are installed on one cutting blade fixing base, and the cutting edges of these cutting blades are positioned on the same straight line. The optical transmission surface treatment method for a rod-shaped optical transmission body according to any one of claims 1 to 7, wherein a cutting blade on which each cutting blade is arranged is used. 9. The optical transmission surface treatment method for a rod-shaped optical transmission body according to claim 8, wherein the interval between adjacent cutting blades installed on one cutting blade fixing base is 50 μm or less.