WO2024048127A1 - Prisme, article en verre et procédé de fabrication de prisme - Google Patents

Prisme, article en verre et procédé de fabrication de prisme Download PDF

Info

Publication number
WO2024048127A1
WO2024048127A1 PCT/JP2023/027060 JP2023027060W WO2024048127A1 WO 2024048127 A1 WO2024048127 A1 WO 2024048127A1 JP 2023027060 W JP2023027060 W JP 2023027060W WO 2024048127 A1 WO2024048127 A1 WO 2024048127A1
Authority
WO
WIPO (PCT)
Prior art keywords
prism
glass
glass member
cross
prism body
Prior art date
Application number
PCT/JP2023/027060
Other languages
English (en)
Japanese (ja)
Inventor
光佑 吉田
義正 山口
Original Assignee
日本電気硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Publication of WO2024048127A1 publication Critical patent/WO2024048127A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms

Definitions

  • the present invention relates to a prism, a glass article, and a method for manufacturing a prism.
  • Prisms are widely used as main components of various optical devices. Prisms include those having a glass prism body (hereinafter sometimes simply referred to as a prism body) having a polygonal prism shape such as a triangular prism shape.
  • the prism body has a plurality of optically functional surfaces on its side surfaces, and both end surfaces are non-optically functional surfaces.
  • a functional film such as an antireflection film is formed on the optically functional surface of the prism body, if necessary.
  • This type of prism body is manufactured, for example, by press-molding a spherical or cylindrical glass base material while heating it (see, for example, Patent Document 1).
  • Prisms are also used in endoscopes, and in the field of endoscopy there is a medical need to insert them into very narrow tubes and holes, such as blood vessels, to observe the inside.
  • endoscopes are required to be further miniaturized.
  • minute prisms mainly prism bodies
  • glass articles including minute prisms.
  • An object of the present invention is to obtain a minute prism or a glass article provided with a minute prism.
  • the present invention which was created to solve the above problems, is a prism comprising a polygonal columnar glass prism body having a plurality of optical functional surfaces on the side surfaces, the prism body having a polygonal cross section.
  • the prism body has a cross-sectional area of 0.032 mm 2 or less, and at least one side of the plurality of sides defining the cross-section of the prism body is 0.25 mm or less.
  • the surface roughness Ra of the optical functional surface is 50 nm or less.
  • the prism body is formed from borosilicate glass having a glass transition point of 700°C or less and a refractive index nd of 1.4 to 1.9. is preferred.
  • the prism body is formed from such borosilicate glass, fluidity suitable for formation can be easily ensured when stretch molding or press molding is used to manufacture the prism body. In other words, it becomes easier to manufacture the prism body. Furthermore, the refractive index within the range required for the prism body can be easily achieved.
  • the cross section of the prism body is an isosceles triangle.
  • the three corners of the isosceles triangle are defined as apex angle A, base angle B, and base angle C, respectively.
  • base angle B and base angle C do not have to be strictly equal; for example, in the case of "base angle B ⁇ base angle C", the ratio of "base angle C/base angle B" is greater than 1 to 1.2. It doesn't matter if it's less than that. In other words, the lengths of the two equilateral sides of an isosceles triangle do not have to be exactly equal.
  • a lens portion may be provided on the optical functional surface.
  • the prism has a predetermined lens function such as condensing and diffusing light.
  • the prism body and the lens portion are integrally molded.
  • the present invention which was created to solve the above problems, is a glass article that includes a prism having the configuration described in (5) or (6) above, and a glass rod, and the end face of the glass rod. is bonded to an optically functional surface different from the optically functional surface on which the lens portion is provided.
  • a reflective film is provided on the optical functional surface located on the optical path between the optical functional surface to which the glass rod is bonded and the optical functional surface on which the lens portion is provided. Preferably.
  • the glass rod is bonded to the prism body via an adhesive layer, and the refractive index difference between the glass rod and the adhesive layer is 0 to 0. 4, and the difference in refractive index between the adhesive layer and the prism body is preferably 0 to 0.4.
  • the present invention which was created to solve the above problems, is a method for manufacturing a prism including a polygonal columnar glass prism body having a plurality of optically functional surfaces on the side surfaces, the first glass member being heated. a stretch-forming step in which the second glass member is press-molded while being heated to obtain an elongated second glass member; a cutting step of cutting the three glass members to a predetermined length to obtain a prism body, the third glass member having a polygonal cross section, and the cross section of the third glass member having an area of 0. 032 mm 2 or less, and the length of at least one side of the plurality of sides defining the cross section of the third glass member is 0.25 mm or less.
  • the second glass member having a very small cross-sectional area can be easily formed by the stretch forming process.
  • the side surface of the second glass member becomes a fire-shaped surface resulting from stretching and forming, and becomes a very smooth surface.
  • the second glass member can be finished into a third glass member having a polygonal cross section that matches the shape of the cross section of the prism body.
  • the side surface of the third glass member also becomes a smooth surface similar to the side surface of the second glass member, so that it functions sufficiently as an optically functional surface even in an unpolished state. Therefore, by cutting the third glass member in the cutting process, a minute prism body can be obtained. In other words, if this prism body is used, minute prisms can be easily manufactured.
  • the value obtained by dividing the cross-sectional area of the second glass member by the cross-sectional area of the third glass member is 1.01 to 1.1.
  • the cross-sectional area of the second glass member is 0.036 mm 2 or less.
  • the area of the cross section of the second glass member obtained in the stretching process becomes sufficiently small. Therefore, changes in the shape of the second glass member during the press molding process can be suppressed to a small extent, making it easier to precisely process the third glass member.
  • the second glass member has a cylindrical shape.
  • the second glass member having a very small cross-sectional area can be easily formed in the stretch forming process.
  • the cross section of the third glass member is an isosceles triangle.
  • the second glass member is uniformly deformed around the line-symmetrical axis in the press molding process. be able to. Therefore, it becomes easier to precisely mold the third glass member from the second glass member.
  • the second glass member is press molded without restraining both ends in the longitudinal direction.
  • the film forming process can be performed more easily than when the functional film is individually formed on the prism body obtained by cutting the third glass member. . Therefore, prism productivity is improved.
  • FIG. 1 is a perspective view showing a prism according to a first embodiment of the present invention.
  • 2 is a sectional view taken along line AA in FIG. 1.
  • FIG. It is a figure showing the example of use of the prism concerning a first embodiment of the present invention. It is a figure showing the example of use of the prism concerning a first embodiment of the present invention. It is a figure showing the example of use of the prism concerning a first embodiment of the present invention. It is a figure showing the example of use of the prism concerning a first embodiment of the present invention. It is a figure showing the example of use of the prism concerning a first embodiment of the present invention.
  • FIG. 2 is a flow diagram showing a method for manufacturing a prism according to a first embodiment of the present invention.
  • FIG. 2 is a side view showing a stretch forming process included in the prism manufacturing method according to the first embodiment of the present invention.
  • FIG. 2 is a perspective view (with the mold open) showing a press molding process included in the prism manufacturing method according to the first embodiment of the present invention.
  • FIG. 9 is a sectional view taken along line BB in FIG. 9;
  • FIG. 2 is a cross-sectional view (with the mold closed) showing a press molding process included in the prism manufacturing method according to the first embodiment of the present invention.
  • FIG. 3 is a perspective view showing a cutting step included in the prism manufacturing method according to the first embodiment of the present invention. It is a top view which shows the glass article based on 2nd embodiment of this invention. 14 is a view taken along arrow C in FIG. 13.
  • FIG. 7 is a cross-sectional view (with the mold closed) showing a press molding step included in the method for manufacturing a glass article according to the second embodiment of the present invention. It is a perspective view which shows the cutting process included in the manufacturing method of the glass article based on 2nd embodiment of this invention.
  • FIG. 2 is a perspective view showing a prism including a lens portion.
  • the prism 1 according to the first embodiment includes a prism body 2 made of glass.
  • the prism body 2 has a triangular prism shape with three optically functional surfaces 3, 4, and 5 on the sides.
  • Each of the optical functional surfaces 3, 4, and 5 is a flat surface.
  • Two adjacent surfaces of the optical functional surfaces 3, 4, and 5 are connected by connection surfaces (corners) 6, 7, and 8, respectively.
  • the connecting surfaces 7 and 8 are rounded, and the connecting surface 6 has a so-called pin angle, which has a sharper tip than the connecting surfaces 7 and 8.
  • both end surfaces 9 and 10 of the prism body 2 are non-optically functional surfaces.
  • the term "optical functional surface” means a surface that intentionally reflects, refracts, transmits, etc. light in a predetermined direction.
  • the surface roughness Ra of the optical functional surfaces 3, 4, and 5 is preferably 50 nm or less, more preferably 30 nm or less, and even more preferably 10 nm or less.
  • surface roughness Ra means a value measured by a method based on JIS B0601:2001.
  • the cross section of the prism body 2 is an isosceles triangle (for example, a right isosceles triangle) having line symmetry.
  • the apex angle ⁇ 1 of the isosceles triangle is preferably 80 to 100 degrees, more preferably 85 to 95 degrees, and even more preferably 90 degrees.
  • the "cross section” is defined as a cross section perpendicular to the three optical functional surfaces 3, 4, and 5, or a cross section perpendicular to the stretching direction if the stretching direction can be specified.
  • the cross-sectional area of the prism body 2 is 0.032 mm 2 or less.
  • the cross-sectional area of the prism body 2 is preferably 0.011 to 0.032 mm 2 , more preferably 0.016 to 0.025 mm 2 or less, and 0.019 to 0.021 mm 2 It is more preferable.
  • the sides 3a and 4a that are equal sides are the short sides, and the remaining side 5a is the long side (hypotenuse).
  • Two adjacent sides among sides 3a, 4a, and 5a are connected by connection lines 6a, 7a, and 8a, respectively.
  • the connecting lines 7a and 8a have a convex curved shape.
  • the sides 3a, 4a, and 5a are straight lines included in the cross sections of the optical functional surfaces 3, 4, and 5.
  • the connection lines 6a, 7a, 8a are straight lines or curves included in the cross section of the connection surfaces 6, 7, 8.
  • the lengths X1 and X2 of the short sides 3a and 4a are 0.25 mm or less.
  • the lengths X1 and X2 of the short sides 3a and 4a are preferably 0.15 to 0.25 mm, more preferably 0.18 to 0.22 mm, and 0.19 to 0.21 mm. is even more preferable.
  • the length X1 of the short side 3a is defined as the length including the connecting lines 6a, 8a on both sides
  • the length X2 of the short side 4a is defined as the length including the connecting lines 6a, 7a on both sides. defined.
  • the length X3 of the long side 5a is not particularly limited, but is, for example, 0.36 mm or less.
  • the length X3 of the long side 5a is defined as a length including the connecting lines 7a, 8a on both sides.
  • the length X4 between both end surfaces 9 and 10 of the prism body 2 is not particularly limited, but is, for example, 0.25 mm or less.
  • the prism body 2 is made of borosilicate glass, for example.
  • the glass composition of borosilicate glass is expressed in mol%: SiO 2 10-70%, B 2 O 3 5-50%, La 2 O 3 0-50%, Al 2 O 3 0-15%, Li 2 O + Na. 2 O+K 2 O 0-20%, CaO+MgO+SrO+BaO 0-15%.
  • Li 2 O + Na 2 O + K 2 O is the total amount of Li 2 O, Na 2 O, and K 2 O
  • CaO + MgO + SrO + BaO is the total amount of CaO, MgO, SrO, and BaO. .
  • the glass transition point of the prism body 2 is preferably 700°C or lower.
  • the glass transition point is preferably 600°C or lower, more preferably 550°C or lower, and even more preferably 500°C or lower.
  • the "glass transition point” is the value of the first inflection point obtained by crushing a glass sample and using DTA (differential thermal analysis).
  • the refractive index nd of the prism body 2 is preferably 1.4 or more, more preferably 1.45 or more, even more preferably 1.5 or more, particularly preferably 1.55 or more, preferably 1.9 or less, and more preferably It is 1.85 or less, more preferably 1.8 or less, particularly preferably 1.75 or less.
  • refractive index nd means the value of the refractive index for the d-line (wavelength 587.6 nm) measured by an Abbe refractometer.
  • the prism 1 may have a functional film on at least one of the optically functional surfaces 3, 4, and 5 of the prism body 2.
  • the functional film include an antireflection film, a reflective film, and a polarizing film.
  • Examples of use of the prism 1 according to the first embodiment are illustrated in FIGS. 3 to 6. Note that the usage examples of the prism 1 are not limited to these.
  • the light L1 is irradiated onto the optical functional surface 3 of the prism body 2 of the prism 1.
  • the light L irradiated onto the optically functional surface 3 passes through the optically functional surface 3 and enters the prism body 2, travels straight through the prism body 2, and is reflected by the optically functional surface 5.
  • the light L reflected by the optical functional surface 5 travels straight through the prism body 2, passes through the optical functional surface 4, and exits the prism body 2.
  • the light L1 is bent by the prism 1 at a predetermined angle (for example, 90 degrees).
  • an antireflection film is formed on the optical functional surfaces 3 and 4 as necessary.
  • a reflective film is formed on the surface of the optically functional surface 5, if necessary.
  • the lights L2 and L3 are irradiated onto the optical functional surfaces 3 and 4 of the prism body 2 of the prism 1, respectively.
  • the light L2 irradiated onto the optical functional surface 3 is reflected by the optical functional surface 3 without entering the prism body 2.
  • the light L3 irradiated onto the optical functional surface 4 is reflected by the optical functional surface 4 without entering the prism body 2.
  • the lights L2 and L3 are each bent at a predetermined angle (for example, 90 degrees) by the prism 1.
  • a reflective film is formed on the surfaces of the optical functional surfaces 3 and 4 as necessary.
  • the light L4 is irradiated onto the optical functional surface 5 of the prism body 2 of the prism 1.
  • the light L4 irradiated onto the optical functional surface 5 passes through the optical functional surface 5 and enters the prism body 2, travels straight through the prism body 2, and is reflected by the optical functional surface 3.
  • the light L4 reflected by the optical function surface 3 travels straight through the prism body 2 and is reflected by the optical function surface 4.
  • the light L4 reflected by the optically functional surface 4 travels straight through the prism body 2, passes through the optically functional surface 5, and exits the prism body 2.
  • the light L4 is bent by the prism 1 at a predetermined angle (for example, 180 degrees).
  • a reflective film is formed on the surfaces of the optical functional surfaces 3 and 4 as necessary.
  • An antireflection film is formed on the surface of the optically functional surface 5, if necessary.
  • two prisms 1 are combined into a cube.
  • one prism 1 will be referred to as a first prism 1x
  • the other prism 1 will be referred to as a second prism 1y.
  • the optically functional surface 5x of the prism body 2x of the first prism 1x is in contact with the optically functional surface 5y of the prism body 2y of the second prism 1y.
  • a polarizing film S having a beam splitter function is formed on at least one surface of the optical functional surfaces 5x and 5y.
  • the light L5 is irradiated onto the optically functional surface 3x of the prism body 2x of the first prism 1x.
  • the light L5 irradiated onto the optical functional surface 3x passes through the optical functional surface 3x, enters the prism body 2x, and travels straight through the prism body 2x to reach the polarizing film S.
  • a portion Lp of the light L5 that has reached the polarizing film S (for example, a P-polarized component included in the light L) is transmitted through the polarizing film S.
  • the light Lp that has passed through the polarizing film S enters the prism body 2y of the second prism 1y, travels straight through the prism body 2y, passes through the optical functional surface 3y, and exits the prism body 2y.
  • a portion Ls of the light L irradiated onto the polarizing film S (for example, an S-polarized component included in the light L) is reflected by the polarizing film S.
  • the light Ls reflected by the polarizing film S travels straight through the prism body 2x, passes through the optical functional surface 4x, and exits the prism body 2x. Thereby, the light L is separated into two lights Lp and Ls.
  • an antireflection film is formed on the surfaces of the optical functional surfaces 3x, 4x, 3y, and 4y as necessary.
  • the method for manufacturing the prism 1 according to the first embodiment includes a stretch molding step S1, a press molding step S2, and a cutting step S3 in this order.
  • the first glass member 11 is stretched downward while being heated to obtain a long second glass member 12 with a small cross-sectional area.
  • the stretch forming step S1 the upper end of the first glass member 11 is supported by the support part 13, and the first glass member 11 is supplied into the heating furnace 14 while lowering the support part 13. Inside the heating furnace 14, the first glass member 11 is heated and softened by the heater 14a. A pair of stretching rollers 15 are provided below the heating furnace 14 to sandwich the sides of the softened first glass member 11 from both sides. After the softened first glass member 11 is stretched downward by the pair of stretching rollers 15, the second glass member 12 is obtained by cutting it to a predetermined length with the cutter 16.
  • the heating temperature of the first glass member 11 is preferably in the range of +70 to 150° C. above the glass transition point of the first glass member 11, that is, the prism body 2.
  • the downward stretching speed (pulling speed) of the first glass member 11 is preferably 1500 to 3000 mm/min, more preferably 1800 to 2700 mm/min, and even more preferably 2000 to 2500 mm/min. preferable.
  • the first glass member 11 and the second glass member 12 are both cylindrical.
  • the cross section of the first glass member 11 is circular.
  • the cross-sectional area of the first glass member 11 before stretching is preferably 100 to 160 mm 2 , more preferably 110 to 150 mm 2 , and even more preferably 120 to 140 mm 2 .
  • the first glass member 11 has the same glass composition as the prism body 2, and is made of borosilicate glass, for example.
  • the cross section of the second glass member 12 is circular.
  • the cross-sectional area of the second glass member 12 is smaller than the cross-sectional area of the first glass member 11 before stretching.
  • the area of the cross section of the second glass member 12 is preferably 0.011 to 0.033 mm 2 , more preferably 0.016 to 0.026 mm 2 , and more preferably 0.019 to 0.022 mm 2 . It is even more preferable that there be.
  • the elongated cylindrical glass member 12 is press molded while being heated to obtain the elongated third glass member 21 in the shape of a triangular prism.
  • a mold 22 is used in the press molding process S2.
  • the mold 22 includes an upper mold 23 that molds a part of the side surface of the second glass member 12 and a lower mold 24 that molds the remainder of the side surface of the second glass member 12.
  • the upper mold 23 is movable relative to the lower mold 24 in the vertical direction.
  • the lower surface of the upper mold 23 has a flat surface 23a for molding a surface corresponding to the long side 5a (optical functional surface 5) in the cross section of the prism body 2.
  • the upper surface of the lower mold 24 has a V-shaped groove 24a for molding respective surfaces corresponding to the two short sides 3a and 4a (optical functional surfaces 3 and 4) that are equilateral in the cross section of the prism body 2.
  • the opening angle ⁇ 2 of the V-shaped groove 24a is the same as the apex angle ⁇ 1 of the prism body 2.
  • the second glass member 12 is placed in the V-shaped groove 24a of the lower mold 24 with the upper mold 23 and the lower mold 24 opened.
  • the longitudinal direction of the second glass member 12 coincides with the longitudinal direction of the V-shaped groove 24a.
  • the second glass member 12 is heated and softened.
  • the upper mold 23 and the lower mold 24 are closed, and the second glass member 12 is press-molded using the flat surface 23a and the V-shaped groove 24a.
  • the second glass member 12 having a circular cross section is deformed, and a long third glass member 21 having a triangular cross section is obtained.
  • both longitudinal ends of the V-shaped groove 24a of the lower die 24 are open. That is, as shown in FIG. 11, when the upper mold 23 and the lower mold 24 are closed and press-molded, both ends of the second glass member 12 in the longitudinal direction are not restrained by the mold 22. As a result, surplus glass left over when the second glass member 12 is press-molded can be released to both sides of the second glass member 12 in the longitudinal direction. Therefore, variations in size and shape of the second glass member 12 can be tolerated to some extent, and productivity of the prism body 2 is improved.
  • the heating temperature of the second glass member 12 is preferably in the range of +50 to 100° C. above the glass transition point of the second glass member 12, that is, the prism body 2.
  • the second glass member 12 is heated, for example, via a mold 22.
  • the mold 22 is heated by electrical heating, a heater, or the like.
  • the preferred range of the cross-sectional area of the third glass member 21 is the same as the preferred range of the cross-sectional area of the prism body 2.
  • the value obtained by dividing the cross-sectional area of the second glass member 12 by the cross-sectional area of the third glass member 21 is preferably 1.01 to 1.1, and preferably 1.02 to 1.08. is more preferable, and even more preferably 1.03 to 1.06. In this way, the change in the shape of the glass in the press molding step S2 can be suppressed to a small extent, making it easier to precisely process the third glass member 21.
  • the third glass member 21 is cut to a predetermined length using the cutter 31 to obtain a plurality of prism bodies 2.
  • the third glass member 21 is cut to a length of 0.25 mm or less. Note that both ends of the third glass member 21 in the longitudinal direction are discarded, and the prism body 2 is collected from the central part of the third glass member 21 in the longitudinal direction.
  • the second glass member 12 having a very small cross-sectional area can be easily formed by the stretch forming step S1.
  • the side surface of the second glass member 12 is a smooth surface made of a fire-finished surface.
  • the second glass member 12 can be finished into the third glass member 21 having a cross section that matches the cross-sectional shape of the prism body 2.
  • the side surface of the third glass member 21 also becomes a smooth surface similar to the side surface of the second glass member 12, it functions sufficiently as an optically functional surface even in an unpolished state. Therefore, by cutting the third glass member 21 in the cutting step S3, a minute prism main body 2 can be stably obtained. In other words, by using this prism body 2, a minute prism 1 can be easily manufactured.
  • the bubbles are stretched in the stretch forming step S1.
  • bubbles are less likely to be included in the cross section of the prism body 2, and even if bubbles are included, there is an advantage that the bubbles are very small and do not affect the optical characteristics of the prism 1.
  • a glass article 41 according to the second embodiment includes a prism 1 including a lens portion 42 and a glass rod 43.
  • the lens portion 42 includes a convex or concave curved lens.
  • Curved lenses include spherical lenses, aspheric lenses, cylindrical lenses, and the like. In this embodiment, the case where the lens portion 42 is an aspherical convex lens will be exemplified.
  • the lens portion 42 is provided on the optically functional surface 3 (corresponding to the short side 3a in the cross section) of the prism body 2.
  • the lens portion 42 is integrally molded with the prism body 2, and there is no adhesive layer interposed between the lens portion 42 and the prism body 2 to bond them together. Therefore, the lens portion 42 is made of the same glass material as the prism body 2 (for example, borosilicate glass).
  • the lens part 42 and the prism main body 2 may be constructed as separate bodies, and both may be joined with an adhesive.
  • an optical functional surface 5 is located on the optical path between the optical functional surface 3 (corresponding to the short side 3a in the cross section) of the prism body 2 and the optical functional surface 4 (corresponding to the short side 4a in the cross section).
  • a reflective film 44 is formed on the long side 5a (corresponding to the long side 5a in the cross section). Note that the reflective film 44 may not be formed.
  • the glass rod 43 is a rod-shaped glass member. In this embodiment, a case is illustrated in which the glass rod 43 is a cylindrical glass member.
  • the glass rod 43 is made of the same glass material as the prism body 2 (for example, borosilicate glass).
  • One longitudinal end surface 43a of the glass rod 43 is bonded to the optically functional surface 4 of the prism body 2 via an adhesive layer 45.
  • the area of the end surface 43a of the glass rod 43 is, for example, 0.07 to 0.2 mm 2 .
  • the longitudinal dimension X5 of the glass rod 43 is, for example, 0.3 to 1 mm.
  • the difference in refractive index between the glass rod 43 and the adhesive layer 45 is preferably 0 to 0.4.
  • the difference in refractive index between the adhesive layer 45 and the prism body 2 is preferably 0 to 0.4.
  • the refractive index difference between the glass rod 43 and the adhesive layer 45 and the refractive index difference between the adhesive layer 45 and the prism body 2 can be calculated from the refractive index values of each member 2, 43, and 45.
  • the refractive index nd of each of the glass rod 43 and the adhesive layer 45 is preferably 1.4 or more, more preferably 1.45 or more, even more preferably 1.5 or more, particularly preferably 1.55 or more, and preferably 1. It is 9 or less, more preferably 1.85 or less, even more preferably 1.8 or less, particularly preferably 1.75 or less.
  • the prism body 2 and the lens portion 42 do not protrude outside the end surface 43a.
  • the ratio P/Q of the area P of the optically functional surface 4 of the prism body 2 to the area Q of the end surface 43a is preferably 0.95 or less. In this way, the peripheral edge of the end surface 43a of the glass rod 43 is located outside the prism body 2 and the lens part 42, so that it is possible to suppress the prism body 2 and the lens part 42 from coming into contact with other members.
  • the light L6 incident on the glass rod 43 from the end surface 43b on one side in the longitudinal direction of the glass rod 43 propagates inside the glass rod 43, and then the light L6 enters the glass rod 43.
  • the light enters the prism body 2 from the other end surface 43a in the longitudinal direction via the optical functional surface 4 of the prism body 2.
  • the light L6 that has entered the prism body 2 is reflected toward the optical function surface 3 by the reflective film 44 formed on the optical function surface 5 of the prism body 2, and is focused by the lens portion 42.
  • the focused light L6 is irradiated onto a predetermined object 46, and the reflected light from the object 46 propagates in the opposite direction along the same optical path as the light L6 and returns to the end surface 43b of the glass rod 43.
  • the state of the object 46 can be grasped by capturing the reflected light that has returned to the end surface 43b of the glass rod 43 into a predetermined measuring device via an optical fiber or the like and analyzing it. Therefore, the glass article 41 is used, for example, in intravascular OCT (Optical Coherence Tomography). In this case, for example, infrared rays are used as the light L6, and the target object 46 is the inner wall of a blood vessel.
  • OCT Optical Coherence Tomography
  • the method for manufacturing a glass article 41 according to the second embodiment includes a first preparation step S4 in which a prism 1 including a lens portion 42 is prepared, and a second preparation step S5 in which a glass rod 43 is prepared. , and a joining step S6 of joining the prism body 2 of the prism 1 and the glass rod 43. Either of the first preparation step S4 and the second preparation step S5 may be performed first, or they may be performed simultaneously.
  • the stretch molding step S1, the press molding step S2, and the cutting step S3 are performed in this order to obtain the prism body 2.
  • the second embodiment is different from the first embodiment, as shown in FIG. The point is that a plurality of lens portions 42 are simultaneously and integrally molded at intervals in the longitudinal direction. Therefore, as shown in FIGS. 17 and 18, in the cutting step S3, the third glass member 21 including the plurality of lens parts 42 is cut to a predetermined length, thereby forming a prism integrally provided with the lens parts 42.
  • the main body 2 can be easily obtained. Note that the number of lens portions 42 molded on one side surface of the third glass member 21 is not limited to a plurality, and may be one.
  • a glass rod 43 is obtained by a redraw method or the like.
  • the prism body 2 of the prism 1 including the lens portion 42 and the glass rod 43 are bonded via the adhesive layer 45. Thereby, the glass article 1 can be obtained.
  • a film forming process may be performed to form a functional film on the side surface of the third glass member after the press molding process and before the cutting process. In this way, the film forming process can be performed more easily than when the functional film is individually formed on the prism body obtained by cutting the third glass member.
  • the third glass member and the prism body are triangular prisms, but the third glass member and the prism body may be polygonal prisms other than triangular prisms.
  • the second glass member formed in the stretch forming process is cylindrical. It may be a prism (for example, a triangular prism). In this way, the amount of deformation of the second glass member during the press molding process is reduced, so that the molding stability of the prism body is improved.
  • the polygonal column-shaped second glass member can be obtained, for example, by stretch-molding a polygonal column-shaped first glass member having a cross section that is substantially similar to the cross section of the second glass member.
  • Example 1 as shown in FIGS. 8 to 12, a cylindrical preform (corresponding to the second glass member) obtained by stretch molding is press-molded to form a triangular prism-shaped glass member (third glass member).
  • a cylindrical preform (corresponding to the second glass member) obtained by stretch molding is press-molded to form a triangular prism-shaped glass member (third glass member).
  • the cross-sectional area of the cylindrical preform (second glass member) was 0.031 mm 2 .
  • the value obtained by dividing the cross-sectional area of the cylindrical preform (second glass member) by the cross-sectional area of the triangular prism-shaped glass member (third glass member) was 1.04.
  • Comparative Example 1 an attempt was made to manufacture a prism body by molding a spherical gob into a triangular prism-shaped glass member by press molding, and then cutting the glass member to a predetermined length.
  • Comparative Example 2 an attempt was made to form a triangular prism-shaped glass member by polishing a gob of a predetermined shape, and then cut the glass member to a predetermined length to manufacture a prism body.
  • Example 1 and Comparative Examples 1 and 2 had a glass composition, in terms of mol%, of 50% SiO 2 , 20% B 2 O 3 , 15% La 2 O 3 , 5% ZnO, and Al 2 O 3 Borosilicate glass containing 5% Na 2 O and 5% Na 2 O was used.
  • the presence or absence of bubbles in the prism body was observed using an optical microscope (50x magnification).
  • the mass productivity of the prism body was judged in three stages: " ⁇ ", " ⁇ ", and “ ⁇ ".
  • ⁇ means that the number of high quality prism bodies obtained was 900 or more.
  • ⁇ means that the number of high quality prism bodies obtained was 500 to 899.
  • X means that less than 500 high quality prism bodies were obtained.
  • high quality means that the short side of the cross section of the prism body has a predetermined length, and there is no cracking or chipping that would affect optical properties.
  • Example 1 even a small prism body with a short side length of 0.25 mm or less in the cross section (the area of the cross section was 0.032 mm 2 or less) could be successfully mass-produced. .
  • Comparative Example 1 it was not possible to manufacture a prism body in which the length of the short side in the cross section was 0.30 mm or less.
  • Comparative Example 2 as the length of the short side in the cross section becomes smaller, the mass productivity of the prism body deteriorates. It was not possible to manufacture a small prism body with a diameter of .032 mm 2 or less.
  • Example 1 no bubbles were observed in the prism body, whereas in Comparative Examples 1 and 2, bubbles were observed in each. Bubbles can adversely affect the optical properties of the prism. Therefore, the prism according to Example 1 has better optical characteristics than the prism according to the comparative example.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un prisme 1 pourvu d'un corps de prisme en verre en forme de colonne polygonale 2 ayant une pluralité de surfaces fonctionnelles optiques en tant que surfaces latérales comprenant : une étape de moulage par étirage S1 pour mouler par étirage un premier élément en verre 11 pour obtenir un long deuxième élément en verre 12 ; une étape de moulage à la presse S2 pour mouler par pression le deuxième élément en verre 12 pour obtenir un troisième élément en verre long en forme de colonne polygonale 21 ; et une étape de découpe S3 pour découper le troisième élément en verre 21 à une longueur prédéterminée pour obtenir le corps de prisme 2. Le troisième élément en verre 21 a une section transversale polygonale. La surface de la section transversale du troisième élément en verre (21) est de 0,032 mm2 ou moins. La longueur d'au moins un côté parmi une pluralité de côtés délimitant la section transversale du troisième élément en verre (21) est inférieure ou égale à 0,25 mm.
PCT/JP2023/027060 2022-09-02 2023-07-24 Prisme, article en verre et procédé de fabrication de prisme WO2024048127A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022139949 2022-09-02
JP2022-139949 2022-09-02

Publications (1)

Publication Number Publication Date
WO2024048127A1 true WO2024048127A1 (fr) 2024-03-07

Family

ID=90099584

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/027060 WO2024048127A1 (fr) 2022-09-02 2023-07-24 Prisme, article en verre et procédé de fabrication de prisme

Country Status (1)

Country Link
WO (1) WO2024048127A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH101321A (ja) * 1996-06-18 1998-01-06 Hooya Precision Kk 光学素子の製造方法
JP2003329817A (ja) * 2002-03-08 2003-11-19 Nippon Electric Glass Co Ltd プリズム及びプリズムの製造方法
JP2006069886A (ja) * 2004-09-03 2006-03-16 Schott Ag マイクロプリズムおよびマイクロロッドレンズ、ならびにそれらを製造する方法および装置
WO2007026776A1 (fr) * 2005-08-30 2007-03-08 Mitsubishi Rayon Co., Ltd. Feuille de déviation de lumière et son procédé de fabrication
JP2008145482A (ja) * 2006-12-06 2008-06-26 Epson Toyocom Corp 直角三角プリズムの製造方法
JP2011128176A (ja) * 2009-12-15 2011-06-30 Nippon Electric Glass Co Ltd 光学部品及びその製造方法
JP2011170224A (ja) * 2010-02-22 2011-09-01 Konica Minolta Opto Inc 光学素子の製造方法
WO2018186123A1 (fr) * 2017-04-03 2018-10-11 オリンパス株式会社 Système d'endoscope et procédé d'ajustement de système d'endoscope

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH101321A (ja) * 1996-06-18 1998-01-06 Hooya Precision Kk 光学素子の製造方法
JP2003329817A (ja) * 2002-03-08 2003-11-19 Nippon Electric Glass Co Ltd プリズム及びプリズムの製造方法
JP2006069886A (ja) * 2004-09-03 2006-03-16 Schott Ag マイクロプリズムおよびマイクロロッドレンズ、ならびにそれらを製造する方法および装置
WO2007026776A1 (fr) * 2005-08-30 2007-03-08 Mitsubishi Rayon Co., Ltd. Feuille de déviation de lumière et son procédé de fabrication
JP2008145482A (ja) * 2006-12-06 2008-06-26 Epson Toyocom Corp 直角三角プリズムの製造方法
JP2011128176A (ja) * 2009-12-15 2011-06-30 Nippon Electric Glass Co Ltd 光学部品及びその製造方法
JP2011170224A (ja) * 2010-02-22 2011-09-01 Konica Minolta Opto Inc 光学素子の製造方法
WO2018186123A1 (fr) * 2017-04-03 2018-10-11 オリンパス株式会社 Système d'endoscope et procédé d'ajustement de système d'endoscope

Similar Documents

Publication Publication Date Title
KR100822953B1 (ko) 광 도파관 렌즈 및 그 제조방법
WO2011108087A1 (fr) Dispositif à émission latérale et procédé de fabrication associé
US20090139268A1 (en) Optical glass, precision press-molding preform, optical element and processes for production of these
JP2013513430A5 (fr)
JP2004335080A5 (fr)
WO2024048127A1 (fr) Prisme, article en verre et procédé de fabrication de prisme
WO2018047714A1 (fr) Lentille d'objectif réfléchissante et procédé d'observation
JP2022533757A (ja) 光学システム
TWI222540B (en) Optical signal altering lensed apparatus and method of manufacture
KR100744648B1 (ko) 레이저빔 쉐이핑 모듈
CN111025453B (zh) 一种光纤锥及其制造方法
EP1484622A1 (fr) Prisme et procedure de fabrication correspondant
JPH1045419A (ja) ガラス被覆層を有するガラスレンズ及びその製造方法
JP3842553B2 (ja) 光学部品
RU2482522C2 (ru) Плоская линза из лейкосапфира и способ ее получения
US7561768B2 (en) Optical branching device
WO1999006865A1 (fr) Element de fixation de fibres optiques, faisceau de fibres optiques, et procedes de fabrication correspondant
TW569049B (en) Optical fiber collimators and their manufacture
US20020136490A1 (en) MEMS optical switch including tapered fiber with hemispheric lens
JP2002277611A (ja) レンズ及び光部品接合体
Lv et al. Fabrication and performances analysis of ball lenses
JP2003149172A (ja) ガラス塊の検査方法および検査装置、ガラス塊の成形方法、光学素子の製造方法、並びにプレス成形用ガラス素材
TW201940440A (zh) 玻璃製成形模型
JP2021196604A (ja) 光ファイバ
JPS62251706A (ja) 光回路とその製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23859896

Country of ref document: EP

Kind code of ref document: A1