WO2010103968A1 - 光学素子、光学素子の製造方法、発光ユニットおよび発光ユニットの組立方法 - Google Patents
光学素子、光学素子の製造方法、発光ユニットおよび発光ユニットの組立方法 Download PDFInfo
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- WO2010103968A1 WO2010103968A1 PCT/JP2010/053415 JP2010053415W WO2010103968A1 WO 2010103968 A1 WO2010103968 A1 WO 2010103968A1 JP 2010053415 W JP2010053415 W JP 2010053415W WO 2010103968 A1 WO2010103968 A1 WO 2010103968A1
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- optical element
- concave
- light emitting
- emitting unit
- optical
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- 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
- C03B11/06—Construction of plunger or mould
- C03B11/10—Construction of plunger or mould for making hollow or semi-hollow articles
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/68—Means for parting the die from the pressed glass other than by cooling or use of a take-out
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1089—Methods of surface bonding and/or assembly therefor of discrete laminae to single face of additional lamina
Definitions
- the present invention relates to an optical element, a method for manufacturing an optical element, a light emitting unit, and a method for assembling a light emitting unit, and in particular, a molten glass droplet dropped on a lower mold is pressed by an upper mold and a lower mold.
- the present invention relates to an optical element, a method for manufacturing the optical element, a light emitting unit, and a method for assembling the light emitting unit.
- a droplet method in which molten glass droplets dropped on a lower mold are pressed by an upper mold and a lower mold, rather than the conventional lens production by polishing. It is getting popular.
- Optical elements such as small-diameter lenses and lenses with short focal lengths that have been difficult to manufacture in the past can now be manufactured by using the droplet method.
- Patent Document 1 discloses a manufacturing method and a manufacturing apparatus of an unpolished lens by a droplet method.
- FIG. 6 is a schematic view showing a method for manufacturing an optical element by a conventional droplet method.
- a molten glass droplet 101 is formed at the tip of the nozzle 40 by glass melted in a melting furnace (not shown).
- the molten glass droplet 101 falls by its own weight (arrow P), and is dropped onto the molding surface 31 (concave surface here) of the lower mold 30 for molding.
- the dropping timing is detected by the dropping sensor 50 by, for example, an optical method or an electrical method.
- FIG. 6 (c) the lower mold 30 having the molten glass droplet 101 mounted on the molding surface 31 is moved to directly below the upper mold 20 having the molding surface 21 (here, convex surface) (arrow Q), and FIG.
- FIG. 6 (d) the upper mold 20 is lowered to the molding position (arrow R), and after a predetermined time has elapsed from the dropping of the molten glass droplet 101, press molding is performed by the upper mold 20 and the lower mold 30.
- FIG. 6E the upper mold 20 is raised from the molding position (arrow S), and the upper mold 20 and the lower mold 30 are separated, and the meniscus lens 10 Molding is completed.
- the temperature of the dropped molten glass droplet 101 is considerably higher than the temperature of the upper mold 20 and the lower mold 30. Since the shrinkage of the meniscus lens 10 during molding is larger than the shrinkage of the upper mold 20 and the lower mold 30, a force F in the direction in which the meniscus lens 10 is wound around the molding surface 21 of the upper mold 20 is generated. As a result, the concave surface 11 of the meniscus lens 10 sticks to the molding surface 21 (convex surface) of the upper mold 20 and the meniscus lens 10 cannot be released from the upper mold 20 as indicated by a broken line in FIG. .
- the present invention has been made in view of the above circumstances, and in the case of molding an optical element having a deep concave surface, the optical element capable of ensuring good releasability without the concave surface of the optical element sticking to the convex surface of the mold. And it aims at providing the manufacturing method of an optical element.
- the object of the present invention can be achieved by the following configuration.
- the optical element has at least one concave optical surface, and an end portion connected to an outer edge portion of the concave optical surface,
- the optical element according to claim 1 wherein a tapered portion having an inclination with respect to a plane formed by an outer edge portion of the concave optical surface is provided at the end portion.
- the tapered portion has an inclination of a taper angle ⁇ on the outer side of the concave optical surface with respect to a plane formed by an outer edge portion of the concave optical surface,
- the taper angle ⁇ is 15 ° ⁇ ⁇ ⁇ 45 ° 2.
- the concave angle ⁇ is 70 ° ⁇ ⁇ ⁇ 90 ° 3.
- the optical element as described in 1 or 2 above.
- an optical element in which a molten glass droplet dropped on a lower mold is pressed by the upper mold and the lower mold, and molded.
- the optical element has at least one concave optical surface;
- the upper mold or the lower mold having a convex surface for forming the concave optical surface of the optical element has a tapered portion inclined with respect to a surface formed by an outer edge portion of the convex surface.
- the tapered portion has an inclination of a taper angle ⁇ on the outer side of the convex surface with respect to a surface formed by an outer edge portion of the convex surface,
- the taper angle ⁇ is 15 ° ⁇ ⁇ ⁇ 45 ° 8.
- a light emitting unit comprising a light emitting member mounted on the substrate, The light emitting unit, wherein the optical element and the substrate are positioned by bringing the positioning part and the tapered part of the optical element into contact with each other.
- An optical element that is positioned on the substrate of the light emitting unit and covers the light emitting element mounted on the substrate, At least one concave optical surface; And an end portion connected to an outer edge portion of the concave optical surface, An optical element having a tapered portion at an end with respect to a plane formed by an outer edge portion of the concave optical surface.
- an end part connected to the outer edge part of the concave optical surface of the optical element is provided on the end face of the optical element, and the outer edge of the concave optical surface is provided at the end part.
- the light emitting unit and the light emitting device that can shorten the process time and prevent the appearance defects due to centering scratches and the occurrence of defects such as cracks and chips.
- a method for assembling the unit can be provided.
- the optical element positioned on the substrate of the light emitting unit and covering the light emitting element mounted on the substrate is provided with at least one concave optical surface and an end connected to the outer edge of the concave optical surface.
- the mold can be released well without sticking the concave optical surface to the convex surface of the mold when molding the optical element. It is possible to provide an optical element that can ensure the property.
- FIG. 1 is a schematic diagram for explaining an optical element that is an object of the present invention.
- the optical element that is the subject of the present invention is an optical element having at least one deep concave surface.
- the meniscus lens 10 composed of the concave surface 11 and the convex surface 12 illustrated in FIG. 1A the concave lens 10 composed of the concave surface 11 and the concave surface 14 illustrated in FIG. 1B, or FIG.
- An optical element 10 such as a concave mirror 10 in which, for example, Al, Ag or the like is vapor-deposited on the concave surface 11 illustrated in FIG.
- the flat surface portion connected to the concave surface 11 is referred to as an end surface 13.
- the concave surface 11 functions as a concave optical surface in the present invention.
- concave surface 11, convex surface 12, concave surface 14 and reflecting surface 11M are not limited to spherical surfaces, but may be aspherical surfaces or a plurality of spherical surfaces or aspherical composite surfaces.
- the concave surface 14 in FIG. 1B may be a plano-concave concave lens formed of a plane having no curvature.
- the optical element 10 according to the present invention only needs to have the deep concave surface 11.
- the concave surface angle ⁇ is defined as the concave surface angle ⁇ .
- FIG. 2 shows the shape of the optical element and the mold according to the first embodiment of the present invention.
- 2A is a cross-sectional view taken along the line AA ′ of FIG. 2B showing the shape of the first embodiment of the optical element
- FIG. 2B is a first embodiment of the optical element.
- 2A is a top view seen from the direction of the arrow R in FIG. 2A
- FIG. 2C is a cross-sectional view showing the shape of the first embodiment of the upper mold corresponding to FIG. It is.
- the optical element 10 is an example of the meniscus lens 10 shown in FIG. 1 (a), which is composed of a concave surface 11 and a convex surface 12, and is defined in FIG. 1 (a).
- the concave surface angle ⁇ is 70 °.
- the end surface 13 of the meniscus lens 10 is provided with an end portion 15 connected to the outer edge portion 111 of the concave surface 11 over the entire circumference, and the end portion 15 is a plane formed by the outer edge portion 111 over the entire circumference.
- the fact that the end portion 15 is connected to the outer edge portion 111 does not only mean that the outer edge portion 111 and the end portion 15 are directly connected, but, for example, the tapered portion 16 of the outer edge portion 111 and the end portion 15. Are also connected by a spherical surface 111R.
- the outermost peripheral portion of the taper portion 16 of the end portion 15 is provided with a flat portion 17 that is parallel to the flat surface 113 formed by the outer edge portion 111 and is a butt surface with the upper mold 20 over the entire periphery. Yes.
- the flat part 17 is not essential.
- the width t of the end portion 15 is equal to the width of the end surface 13 of the meniscus lens 10.
- the width d of the tapered portion 16 is preferably not less than 1 ⁇ 2 of the width t of the end portion 15.
- FIG. 2 (c) shows only the periphery of the molding surface (convex surface) 21 of the upper mold 20.
- type 20 is comprised by the molding surface 21, the taper part 26, the flat part 27 grade
- the molding surface 21 and the taper portion 26 are connected by a spherical surface 211R having the smallest moldable radius.
- ⁇ 30 °
- the maximum value of the angle formed between the normal line H of the molding surface 21 and the pressing direction R of the press molding of the upper mold 20 and the lower mold 30, that is, the concave surface angle ⁇ is 70 ° here.
- FIG. 3 is a schematic view showing a method of manufacturing the optical element according to the first embodiment.
- FIG. 3A is a view showing the upper mold 20 and the lower mold 30 after the press molding is finished in FIG.
- FIG. 3B shows a state when the separation is started, and
- FIG. 3B shows a state where the upper mold 20 and the lower mold 30 are separated as in FIG. 6E.
- the taper angle ⁇ described above is preferably 15 ° ⁇ ⁇ ⁇ 45 °. Further, from the results of Examples described later, the concave surface angle ⁇ is effective when 70 ° ⁇ ⁇ ⁇ 90 °.
- the molding surface 21 of the upper mold 20 is a convex surface and the molding surface 31 of the lower mold 30 is a concave surface, but this may be reversed.
- the meniscus lens which consists of a concave surface and a convex surface was illustrated as an optical element, the other example shown in FIG. 1 may be sufficient and what is necessary is just an optical element which has a deep concave surface.
- the entire periphery of the end face of the optical element is connected to the outer edge of the concave optical surface of the optical element.
- the concave optical surface of the optical element becomes a convex surface of the mold. It is possible to provide an optical element and a method for manufacturing the optical element that can ensure good releasability without sticking.
- FIG. 4 is a schematic diagram showing the shape of the second embodiment of the optical element in the present invention.
- 4 (a) is a cross-sectional view taken along the line BB ′ of FIG. 4 (b) showing the shape of the second embodiment
- FIG. 4 (b) is the shape of the second embodiment shown in FIG. 4 (a). It is the top view seen from the arrow R direction.
- the end portion 15 is provided at a position obtained by dividing the end surface 13 into three equal parts and having a size obtained by dividing the end surface 13 into six equal parts, and protrudes along the end surface 13 toward the convex surface 12.
- tapered portion 16 and the flat portion 17 are provided in the end portion 15 as in the first embodiment, and the effect of improving the mold release provided by the tapered portion 16 is also the same.
- the concave optical surface of the optical element when molding the optical element by the droplet method, a part of the end face of the optical element is connected to the outer edge of the concave optical surface of the optical element.
- the concave optical surface of the optical element does not stick to the convex surface of the mold.
- FIG. 7 is a schematic diagram illustrating a problem in the optical element used in the light emitting unit
- FIG. 8 is a schematic diagram illustrating an example of the light emitting unit and a method for assembling the light emitting unit
- FIG. 9 is a schematic diagram showing an embodiment of a light emitting unit using the optical element of the present invention and a method for assembling the light emitting unit.
- the problem of the optical element used in the light emitting unit will be described.
- the molten glass droplet 101 is a cavity of the molding surface 31 (concave surface) of the lower mold 30 in FIG. 6C. It is illustrated that the droplets are dropped with a droplet smaller than the size of.
- the molten glass droplet 101 is a droplet larger than the position 31a where at least the surface shape of the molding surface 31 of the lower mold 30 is indicated by the broken line in FIG. Needs to be dripped.
- a part of the molten glass droplet 101 protrudes into the gap between the upper mold 20 and the lower mold 30 by press molding, and a meniscus lens as shown in FIG. 7C.
- a brim portion 19 is formed at 10.
- the size and shape of the brim portion 19 vary, normally, as shown in FIG. 8A, so-called centering is performed in which a part of the brim portion 19 of the meniscus lens 10 is removed by a method such as polishing. And trimming the outer shape. By this centering process, the end surface 19a with high dimensional accuracy is formed.
- the light emitting unit 3 includes a substrate 301, a light emitting element 303 such as a light emitting diode (LED) mounted on the substrate 301, and a light emitting element 303 provided on the substrate 301. It is composed of a meniscus lens 10 or the like to cover. In the light emitting unit 3, it is necessary to position the light emitting element 303 and the optical axis of the meniscus lens 10.
- the end surface 19a is brought into contact with the end surface 305b of the frame body 305 by using the end surface 19a having high dimensional accuracy formed by centering the collar portion 19 of the meniscus lens 10. To drop into the frame body 305 for positioning.
- the light emitting unit 3 is assembled by first mounting the light emitting element 303 on the substrate 301 by a method such as die bonding or wire bonding. Next, the frame body 305 is positioned by inserting the projections 305a of the frame body 305 into the positioning holes provided in the substrate 301, and in this state, the substrate 301 and the frame body 305 are bonded and fixed.
- the end surface 19a of the meniscus lens 10 is dropped into the inside of the frame body 305 so as to be in contact with the end surface 305b of the frame body 305, and in this state, the end surface 19a and the frame body 305 are bonded with an adhesive 307. And fix.
- the centering of the collar portion 19 of the meniscus lens 10 shown in FIG. 8A takes a long process time, and the centering scratches on the optical surface of the meniscus lens 10 due to chucking during centering. As a result, the appearance is poor, and defects such as cracks and chips on the end surface 19a and the optical surface due to polishing occur, which is a major factor in increasing costs.
- the flange 19 is left as it is without performing centering, and positioning is performed using the tapered portion 16 provided in the meniscus lens 10, thereby overcoming the above-described problems.
- FIG. 9A shows a shape in which the flange portion 19 is formed on the meniscus lens 10 of the first embodiment of the optical element shown in FIG.
- the collar portion 19 is formed on the outer periphery of the end portion 15 having the tapered portion 16.
- the structure of the light emission unit 3 is shown in FIG.9 (b).
- the light emitting unit 3 includes a substrate 301, a light emitting element 303 such as a light emitting diode (LED), a positioning member 315, a meniscus lens 10, and the like, as shown in FIG. 8B.
- the positioning member 315 is provided with a positioning portion 315 b at a position facing the tapered portion 16 of the meniscus lens 10. Note that the substrate 301 and the positioning member 315 may be integrally formed.
- the light emitting unit 3 is assembled by first mounting the light emitting element 303 on the substrate 301 by a method such as die bonding or wire bonding (light emitting element mounting step). Next, the protrusion 315a of the positioning member 315 is inserted into the hole provided in the substrate 301 to position the positioning member 315, and in that state, the positioning member 315 is attached to the substrate 301 by bonding or the like (positioning member attaching step). .
- a UV (ultraviolet) curable adhesive 317 is applied in advance to the positioning portion 315b of the positioning member 315, and the positioning portion 315b and the tapered portion 16 of the meniscus lens 10 are brought into contact with each other for positioning ( Positioning process).
- the positioning member 315 and the meniscus lens 10 are bonded and fixed by irradiating UV light from the outside of the meniscus lens 10 and curing the UV curable adhesive 317 (adhesion process).
- the light emitting element 303 can be sealed in the space surrounded by the substrate 301 and the meniscus lens 10 by applying and bonding the adhesive 317 to the entire circumference where the positioning portion 315b and the tapered portion 16 are in contact with each other. And reliability can be improved.
- a method of bonding the flange portion 19 and the substrate 301 is also conceivable. Also in this case, the flange portion 19 and the substrate 301 are bonded over the entire periphery, so that the light emitting element 303 can be sealed and the reliability can be improved.
- the meniscus is formed without performing centering of the flange portion 19 formed on the meniscus lens 10.
- the light emitting unit can shorten the process time and prevent the appearance defects due to centering scratches and the occurrence of defects such as cracks and chips.
- a method for assembling the light emitting unit can be provided.
- an end part connected to the outer edge part of the concave optical surface of the optical element is provided on the end face of the optical element.
- the light emitting unit and the light emitting device that can shorten the process time and prevent the appearance defects due to centering scratches and the occurrence of defects such as cracks and chips.
- a method for assembling the unit can be provided.
- the optical element positioned on the substrate of the light emitting unit and covering the light emitting element mounted on the substrate is provided with at least one concave optical surface and an end connected to the outer edge of the concave optical surface.
- the mold can be released well without sticking the concave optical surface to the convex surface of the mold when molding the optical element. It is possible to provide an optical element that can ensure the property.
- FIG. 5 is a graph showing the release state of the example of the first embodiment of the optical element and the comparative example.
- Comparative Examples D, E, and F have a shape in which the end portion 15 does not have the tapered portion 16 connected to the concave surface 11, similarly to the meniscus lens 10 shown in FIG. The other points are the same as the meniscus lens 10 of the embodiment of FIG.
- press timing 3
- press time 4
- press time 3
- the time for press molding (hereinafter referred to as press time) T2 was changed from 0.1 second to 5 seconds, and the release state of the press-molded meniscus lens 10 was measured.
- the meniscus lens 10 used in the experiment has 14 types in total, including seven types from A to C and G to J in the example and seven types from D to F and K to N in the comparative example. This is shown in Table 1 together with the determination results described later.
- the other shapes and materials are common to the examples and the comparative examples.
- press time T2 1 second is used as the judgment condition, and when the press time T2 is 1 second or longer and a subscript state exists, it is judged as ⁇ , and when the press time T2 is 1 second or longer and no subscript state exists, it is judged as x did.
- Example (A) since the very favorable result was obtained compared with others, it was set as (double-circle).
- (D), (E), (L), (N) became (circle), (F), (K), (M) became x.
- the range of the taper angle ⁇ exhibiting good releasability even with a deep concave surface having a concave surface angle ⁇ of 70 ° to 90 ° is 15 ° ⁇ ⁇ ⁇ 45 °.
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Abstract
Description
前記光学素子は、少なくとも1つの凹の光学面と、前記凹の光学面の外縁部に連なる端部とを有し、
前記端部には、前記凹の光学面の外縁部がなす平面に対して傾斜を持ったテーパ部が設けられていることを特徴とする光学素子。
前記テーパ角度αは、
15°≦α≦45°
であることを特徴とする前記1に記載の光学素子。
前記凹面角度θは、
70°≦θ≦90°
であることを特徴とする前記1または2に記載の光学素子。
前記光学素子は、少なくとも1つの凹の光学面を有し、
前記光学素子の前記凹の光学面を形成するための凸面を有する前記上型または前記下型は、前記凸面の外縁部がなす面に対して傾斜を持ったテーパ部を有することを特徴とする光学素子の製造方法。
前記テーパ角度αは、
15°≦α≦45°
であることを特徴とする前記7に記載の光学素子の製造方法。
位置決め部を有する基板と、
前記基板の上に実装された発光部材とを備えた発光ユニットにおいて、
前記位置決め部と前記光学素子の前記テーパ部とを当接させることで前記光学素子と前記基板とを位置決めすることを特徴とする発光ユニット。
位置決め部を有する基板と、
前記基板の上に実装された発光部材とを備えた発光ユニットの組立方法において、
前記位置決め部と前記光学素子の前記テーパ部とを当接させることで前記光学素子と前記基板とを位置決めする位置決め工程を備えたことを特徴とする発光ユニットの組立方法。
少なくとも1つの凹の光学面と、
前記凹の光学面の外縁部に連なる端部とを有し、
前記端部に、前記凹の光学面の外縁部がなす平面に対して傾斜を持ったテーパ部を有することを特徴とする光学素子。
11 凹面
11M 反射面
111 (凹面11の)外縁部
111R 球面
113 平面
12 凸面
13 端面
14 凹面
15 端部
16 テーパ部
17 平坦部
18 球面部
20 上型
21 成形面
211 (成形面21の)外縁部
211R 球面
213 平面
26 テーパ部
27 平坦部
30 下型
31 成形面
40 ノズル
50 滴下センサ
101 溶融ガラス滴
t (端面13の)幅
d (テーパ部16の)幅
T1 プレスタイミング
T2 プレスタイム
α テーパ角度
θ 凹面角度
3 発光ユニット
19 ツバ部
19a 端面
301 基板
303 発光素子
305 枠体
305a 突起部
305b 端面
307 接着剤
315 位置決め部材
315a 突起部
315b 位置決め部
317 接着剤
Claims (15)
- 下型の上に滴下された溶融ガラス滴を、上型と前記下型とで加圧して成形される光学素子において、
前記光学素子は、少なくとも1つの凹の光学面と、前記凹の光学面の外縁部に連なる端部とを有し、
前記端部には、前記凹の光学面の外縁部がなす平面に対して傾斜を持ったテーパ部が設けられていることを特徴とする光学素子。 - 前記テーパ部は、前記凹の光学面の外縁部がなす平面に対して前記凹の光学面の外側にテーパ角度αの傾斜を持っており、
前記テーパ角度αは、
15°≦α≦45°
であることを特徴とする請求項1に記載の光学素子。 - 前記凹の光学面の法線と前記上型と前記下型との加圧方向とがなす角度の最大値を凹面角度θとすると、
前記凹面角度θは、
70°≦θ≦90°
であることを特徴とする請求項1または2に記載の光学素子。 - 前記テーパ部は、前記端部の全周に設けられていることを特徴とする請求項1から3の何れか1項に記載の光学素子。
- 前記テーパ部は、前記端部の一部に設けられていることを特徴とする請求項1から3の何れか1項に記載の光学素子。
- 前記テーパ部は、前記光学素子の端部の厚さの1/2以上の幅を有することを特徴とする請求項1から5の何れか1項に記載の光学素子。
- 下型の上に滴下された溶融ガラス滴を、上型と前記下型とで加圧して成形する光学素子の製造方法において、
前記光学素子は、少なくとも1つの凹の光学面を有し、
前記光学素子の前記凹の光学面を形成するための凸面を有する前記上型または前記下型は、前記凸面の外縁部がなす面に対して傾斜を持ったテーパ部を有することを特徴とする光学素子の製造方法。 - 前記テーパ部は、前記凸面の外縁部がなす面に対して前記凸面の外側にテーパ角度αの傾斜を持っており、
前記テーパ角度αは、
15°≦α≦45°
であることを特徴とする請求項7に記載の光学素子の製造方法。 - 下型の上に滴下された溶融ガラス滴を、上型と前記下型とで加圧して成形される光学素子であって、少なくとも1つの凹の光学面と、前記凹の光学面の外縁部に連なる端部とを有し、前記端部に、前記凹の光学面の外縁部がなす平面に対して傾斜を持ったテーパ部を有する光学素子と、
位置決め部を有する基板と、
前記基板の上に実装された発光部材とを備えた発光ユニットにおいて、
前記位置決め部と前記光学素子の前記テーパ部とを当接させることで前記光学素子と前記基板とを位置決めすることを特徴とする発光ユニット。 - 前記位置決め部は、前記基板とは別体の位置決め部材に設けられていることを特徴とする請求項9に記載の発光ユニット。
- 前記位置決め部と前記光学素子の前記テーパ部とを当接させた後に、接着により前記光学素子を固定することを特徴とする請求項9または10に記載の発光ユニット。
- 下型の上に滴下された溶融ガラス滴を、上型と前記下型とで加圧して成形される光学素子であって、少なくとも1つの凹の光学面と、前記凹の光学面の外縁部に連なる端部とを有し、前記端部に、前記凹の光学面の外縁部がなす平面に対して傾斜を持ったテーパ部を有する光学素子と、
位置決め部を有する基板と、
前記基板の上に実装された発光部材とを備えた発光ユニットの組立方法において、
前記位置決め部と前記光学素子の前記テーパ部とを当接させることで前記光学素子と前記基板とを位置決めする位置決め工程を備えたことを特徴とする発光ユニットの組立方法。 - 前記位置決め部は、前記基板とは別体の位置決め部材に設けられていることを特徴とする請求項12に記載の発光ユニットの組立方法。
- 前記位置決め工程で、前記位置決め部と前記光学素子の前記テーパ部とを当接させた後に、接着により前記光学素子を固定する接着工程を備えたことを特徴とする請求項12または13に記載の発光ユニットの組立方法。
- 発光ユニットの基板に位置決めされ、前記基板に実装された発光素子をカバーする光学素子であって、
少なくとも1つの凹の光学面と、
前記凹の光学面の外縁部に連なる端部とを有し、
前記端部に、前記凹の光学面の外縁部がなす平面に対して傾斜を持ったテーパ部を有することを特徴とする光学素子。
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