EP1320890A2 - Strahlungsquelle und verfahren zur herstellung einer linsenform - Google Patents
Strahlungsquelle und verfahren zur herstellung einer linsenformInfo
- Publication number
- EP1320890A2 EP1320890A2 EP01956408A EP01956408A EP1320890A2 EP 1320890 A2 EP1320890 A2 EP 1320890A2 EP 01956408 A EP01956408 A EP 01956408A EP 01956408 A EP01956408 A EP 01956408A EP 1320890 A2 EP1320890 A2 EP 1320890A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- radiation source
- semiconductor chips
- radiation
- microlenses
- source according
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00278—Lenticular sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00365—Production of microlenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W90/00—Package configurations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/50—Bond wires
- H10W72/531—Shapes of wire connectors
- H10W72/536—Shapes of wire connectors the connected ends being ball-shaped
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W72/00—Interconnections or connectors in packages
- H10W72/50—Bond wires
- H10W72/531—Shapes of wire connectors
- H10W72/5363—Shapes of wire connectors the connected ends being wedge-shaped
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W74/00—Encapsulations, e.g. protective coatings
- H10W74/10—Encapsulations, e.g. protective coatings characterised by their shape or disposition
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W90/00—Package configurations
- H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
- H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
- H10W90/754—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between a chip and a stacked insulating package substrate, interposer or RDL
Definitions
- the invention relates to a radiation source with a multiplicity of semiconductor chips arranged next to one another.
- the invention further relates to a method for producing a lens shape suitable for producing a field of microlenses.
- Radiation sources such as, for example, luminescent diodes, generally have a semiconductor chip cast into a transparent lens body. It is also known to increase the radiation power of such radiation sources by providing a large number of semiconductor chips. Such radiation sources usually have condenser optics which consist of a lens. However, the radiation density of such radiation sources is often unsatisfactory when it is important to create a luminous radiation source with a small spatial extent.
- the object of the invention is to create a radiation source of high radiance.
- This object is achieved in that a field of lenses forming a hexagonal grid is arranged in the radiation direction in front of the semiconductor chips.
- the hexagonal arrangement of the lenses enables a high areal density of the associated semiconductor chips to be achieved.
- the radiance of the radiation source is correspondingly high. Since the lenses are usually formed by spherical segments, spherical segments with a large radius can be used for the lenses. be chosen. As a result, the radiation-emitting active layer of the semiconductor chips can for the most part be arranged within the egg strass associated with the respective sphere. This results in a high radiation yield with respect to the individual semiconductor chips.
- the invention is also based on the object of providing a rational method for producing a lens shape which is suitable for producing a field of lenses.
- This object is achieved in that the lens shape is molded on a set of balls held by a hexagonal frame.
- the set of balls is, as it were, brought into a hexagonal lattice structure when the balls are close together. It is therefore sufficient to ensure that the socket is completely filled with the balls to be molded.
- Figure 1 is a plan view of a semiconductor chip equipped and already bonded circuit board for the radiation source according to the invention
- Figure 2 is an enlarged cross-sectional view of the circuit board of Figure 1;
- Figure 3 is a plan view of a field of lenses
- FIG. 4 shows a cross section through a casting mold that can be used to produce a microlens field
- Figure 5 is a plan view of the casting mold from Figure 4.
- FIG. 6 shows a cross section through a further device used for the production of the casting mold
- FIG. 7 shows a cross section through the casting device used to produce the microlens field
- Figure 8 is a diagram showing the radiation power as a function of the distance between the top edge of the semiconductor chip and the associated hemispherical microlens.
- Figure 1 shows a plan view of a circuit board 1, which is made of Al 2 0 3 or Si.
- circuit board 1 which is made of Al 2 0 3 or Si.
- connection contacts 2 are formed, of which conductor tracks 3 to
- Semiconductor chips 7 are attached to the chip contact areas 6 and bonded in rows in each case.
- FIG. 2 shows an enlarged detail from a cross section through the printed circuit board 1 provided with microlenses 8. It can be seen that the semiconductor chips 7 are each attached to the chip contact surfaces 6 with an underside 9. The bond wires 5, which lead to an adjacent chip contact area 6 or to one of the contact points 4, are respectively attached to an upper side 10 of the semiconductor chips 7.
- the microlenses 8 are hemispheres with a radius R.
- the geometric center of the microlenses 8 is located at a distance .DELTA.x from the top of the semiconductor chips 7.
- the distance .DELTA.x is selected so that the radiation in each case emitting active layer of the semiconductor chips 7 is located at least half within the Weierstrass' sphere with radius R / n, where n is the refractive index of the material used for the micro lens 8.
- the centers of the egg strass 'spheres coincide with the centers of the microlenses 8. Radiation generated within the Weierstrass' sphere can exit the microlens 8.
- microlenses 8 are expediently cast from synthetic resin.
- the manufacturing process is carried out as follows:
- a first mold plate 11 is produced, which, as shown in FIG. 4, has a central mandrel 12 with a hexagonal cross section which can be seen in FIG.
- the mandrel 12 is arranged on a base 13.
- Dowel pins 14 are located in the vicinity of the base 13.
- a holding frame 15, which has depressions 16 on its inside, is also attached to the first mold plate 11.
- the interior delimited by the holding frame 15 is filled with silicone. This forms a silicone frame 17, the one in the center
- Cross section has hexagonal opening.
- the silicone frame 17 engages in the recesses 16 and can therefore be simple Be attached together with the holding frame 15 to a second mold plate 19 shown in Figure 6.
- the dowel pins 14 also present here serve to align the holding frame 15 and the silicone frame 17 on the second mold plate 19.
- the silicone frame 17 comes to rest on the second mold plate 19 in such a way that the opening 18 of the silicone frame 17 with a socket 20 in the second Form plate 19 is aligned.
- the frame 20 occupies the space of the base 13 of the first mold plate 11 with its side webs 21. It also has a hexagonal cross section. Beads 22 are placed in the holder 20 in a tightly lying manner.
- the spheres 22 have a radius which essentially corresponds to the radius of the microlenses 8 to be produced. Since the holder 20 has a hexagonal cross section and since the beads 22 lie close together, the beads 22 are arranged according to a hexagonal lattice structure.
- the opening 18 is then filled with silicone.
- the casting device 23 has a suction nozzle 25, on which a base plate 26 is attached, which holds the circuit board 1.
- a central suction opening 27 is provided, which leads to the printed circuit board 1.
- the holding frame 15 with the microlens shape 24 is located above the base plate 26. Both are partially covered by a press plate 28, which is connected to the base plate 26 via a screw connection (not shown) and ensures the secure fit of the microlens shape 24 on the base plate 26.
- the dowel pins 14 have left passages 29 in the microlens mold 24 which serve to introduce the synthetic resin into the cavity of the microlens mold 24 above the printed circuit board 1. It should be noted that the circuit board 1 is of course already provided with the semiconductor chips 3 under the microlens mold 24 and is fully bonded.
- FIG. 8 shows a diagram in which the radiation power ⁇ is shown in a solid angle with a half opening angle of 60 °, that is to say an opening angle of 120 ° as a function of the distance ⁇ x.
- the diameters of the microlens 8 were 500 ⁇ m, 600 ⁇ m and 700 ⁇ m. It is clear from FIG. 8 that the radiation power takes the greatest values in the detected solid angle at a distance ⁇ x of 0.1 mm. There is the radiation line power approximately twice as large as without microlenses 8. At this distance, a large part of the active layer of the semiconductor chip 7 also lies within the Weierstrass' see ball of the microlenses 8.
- microlenses 8 For practical reasons, it can nevertheless be advantageous if a diameter of 700 ⁇ m is selected for the microlenses 8, since otherwise problems can occur when bonding the semiconductor chips 7 on the chip contact surfaces 6 and when bonding the bonding wires 5.
- conventional casting resins shrink during curing, which is why the cured microlenses anyway are about 6% smaller than the corresponding shapes of the microlens mold 24.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Led Device Packages (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10038213A DE10038213A1 (de) | 2000-08-04 | 2000-08-04 | Strahlungsquelle und Verfahren zur Herstellung einer Linsensform |
| DE10038213 | 2000-08-04 | ||
| PCT/DE2001/002874 WO2002013231A2 (de) | 2000-08-04 | 2001-07-30 | Strahlungsquelle und verfahren zur herstellung einer linsenform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1320890A2 true EP1320890A2 (de) | 2003-06-25 |
Family
ID=7651403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01956408A Withdrawn EP1320890A2 (de) | 2000-08-04 | 2001-07-30 | Strahlungsquelle und verfahren zur herstellung einer linsenform |
Country Status (7)
| Country | Link |
|---|---|
| US (2) | US7262437B2 (de) |
| EP (1) | EP1320890A2 (de) |
| JP (2) | JP2004506321A (de) |
| CN (2) | CN101219568A (de) |
| DE (1) | DE10038213A1 (de) |
| TW (1) | TW538255B (de) |
| WO (1) | WO2002013231A2 (de) |
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| US5600148A (en) | 1994-12-30 | 1997-02-04 | Honeywell Inc. | Low power infrared scene projector array and method of manufacture |
| JPH08227603A (ja) | 1995-02-21 | 1996-09-03 | Koito Mfg Co Ltd | 車輌用表示ランプ |
| DE19621148A1 (de) | 1996-05-14 | 1997-12-04 | Magna Reflex Holding Gmbh | Leuchtelement |
| JPH1012926A (ja) | 1996-06-20 | 1998-01-16 | Toyoda Gosei Co Ltd | 全色発光型発光ダイオードランプ及びディスプレイ装置 |
| JP2000511711A (ja) * | 1997-03-18 | 2000-09-05 | オブシェストボ エス オグラノチェノイ オトヴェツトヴェノスチウ(コルヴェト ライツ) | 発光ダイオード |
| JP4171933B2 (ja) | 1997-09-12 | 2008-10-29 | ソニー株式会社 | 平面型レンズの製造方法 |
| CN1276917A (zh) | 1997-09-25 | 2000-12-13 | 布里斯托尔大学 | 光学辐照装置 |
| US6339503B1 (en) * | 1998-11-06 | 2002-01-15 | Oni Systems Corp. | Optical interconnect using microlens/minilens relay |
| US6665060B1 (en) * | 1999-10-29 | 2003-12-16 | Cytyc Corporation | Cytological imaging system and method |
| DE10051159C2 (de) | 2000-10-16 | 2002-09-19 | Osram Opto Semiconductors Gmbh | LED-Modul, z.B. Weißlichtquelle |
| US6715901B2 (en) * | 2002-08-15 | 2004-04-06 | Shi-Hwa Huang | Image projector system having a light source that includes at least four light emitting diode modules |
-
2000
- 2000-08-04 DE DE10038213A patent/DE10038213A1/de not_active Withdrawn
-
2001
- 2001-07-17 TW TW090117424A patent/TW538255B/zh not_active IP Right Cessation
- 2001-07-30 CN CNA2008100012624A patent/CN101219568A/zh active Pending
- 2001-07-30 JP JP2002518497A patent/JP2004506321A/ja active Pending
- 2001-07-30 US US10/343,819 patent/US7262437B2/en not_active Expired - Fee Related
- 2001-07-30 CN CNB018137725A patent/CN100517706C/zh not_active Expired - Fee Related
- 2001-07-30 WO PCT/DE2001/002874 patent/WO2002013231A2/de not_active Ceased
- 2001-07-30 EP EP01956408A patent/EP1320890A2/de not_active Withdrawn
-
2006
- 2006-11-08 JP JP2006302593A patent/JP2007112134A/ja active Pending
-
2007
- 2007-08-20 US US11/894,569 patent/US20070290383A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0213231A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002013231A2 (de) | 2002-02-14 |
| US20070290383A1 (en) | 2007-12-20 |
| CN100517706C (zh) | 2009-07-22 |
| CN101219568A (zh) | 2008-07-16 |
| JP2007112134A (ja) | 2007-05-10 |
| WO2002013231A3 (de) | 2002-06-20 |
| CN1447983A (zh) | 2003-10-08 |
| JP2004506321A (ja) | 2004-02-26 |
| US7262437B2 (en) | 2007-08-28 |
| US20040026706A1 (en) | 2004-02-12 |
| TW538255B (en) | 2003-06-21 |
| DE10038213A1 (de) | 2002-03-07 |
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