US20070251272A1 - Rectangular monobloc optical lens and manufacturing method thereof - Google Patents
Rectangular monobloc optical lens and manufacturing method thereof Download PDFInfo
- Publication number
- US20070251272A1 US20070251272A1 US11/826,395 US82639507A US2007251272A1 US 20070251272 A1 US20070251272 A1 US 20070251272A1 US 82639507 A US82639507 A US 82639507A US 2007251272 A1 US2007251272 A1 US 2007251272A1
- Authority
- US
- United States
- Prior art keywords
- lens
- mold
- aspherical
- rectangular
- rectangular sheet
- 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.)
- Abandoned
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0025—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having one lens only
-
- 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
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/40—Product characteristics
- C03B2215/46—Lenses, e.g. bi-convex
- C03B2215/49—Complex forms not covered by groups C03B2215/47 or C03B2215/48
Abstract
A rectangular monobloc optical lens and a manufacturing method thereof are disclosed. A monobloc optical lens includes a rectangular surround and a central mirror-surface area. The rectangular surround is mounted inside a clipping part of a lens holder. The central mirror-surface area consists of a convex aspherical surface and a concave aspherical surface while the convex aspherical surface faces an image side and the concave aspherical surface faces an object side. The manufacturing method includes the steps of: cutting a sheet made from glass material into a plurality of rectangular sheet units; then setting the rectangular sheet unit into a mold for lens for hot pressing. Thereby, the manufacturing process is simplified and the cost is reduced. Moreover, the lens has high resolution and the volume of the lens is effectively reduced so as to increase the applications of the lens.
Description
- The present invention relates to a rectangular monobloc optical lens and a manufacturing method thereof, especially to a monobloc glass lens having a concave and a convex aspherical surfaces with features of high performance and lower cost and a manufacturing method thereof. The lens is applied to mobile phones with cameras, or other cameras with image sensors such as Charge-Charged Device (CCD), or Complementary Metal-Oxide Semiconductor (CMOS).
- Due to fast progress of modern technology, electronics are getting more compact, light-weigh, and having multiple functions. While a lot of electronics such as digital cameras, PC cameras, network cameras, mobile phones or personal digital assistance are mounted with an image taking device. For easy carrying and requirements of users, the image taking device not only has good image quality, but also has compact size as well as low cost so that it can be used widely.
- There are various materials for producing spherical lens. The glass lens is better for correcting chromatic aberration so that it is adapted widely. However, it's difficult to correct Aberrations such as aplanatism or astigmatism for the glass spherical lens with smaller F Number and wide angle. In order to improve such disadvantages, aspherical plastic lens or aspherical glass lens are applied on image taking devices for better image quality. Please refer to U.S. Pat. No. 6,031,670, Japanese Patent Application No. P2001-183578A, or Taiwanese Patent Application No. 573740. Yet the lens length of the optical lens disclosed above is still too long. For example, the lens disclosed in Japanese Patent Application No. P2001-183578A consists of two lens sets. The so-called 1g-1p lens includes a glass lens and a plastic lens while “2-g”, “2-p” respectively represent two sets of glass lens and plastic lens. The distance from the first surface of the first lens to the second surface of the second lens is larger or equal to 0.9f (d≧0.9f, f is focal length of the whole lens set). Thus the volume of camera lens can't be reduced. Neither can the manufacturing cost be reduced.
- Moreover, manufacturing processes of a conventional aspherical lens with biconvex aspherical surfaces includes following steps: a block of molding glass is cut into a plurality of small units. Each of the units is grinded and polished so as to form a semi-product with biconvex surfaces or a spherical semi-product. Then the semi-product is set into a mold for lens for hot pressing. It's time and labor consuming to run the grinding and polishing processes. Thus the manufacturing cost is increased and the process can't be refined. Therefore, the requirements of compact size and light weight for electronics can't be satisfied and the applications of the lens are restricted.
- Therefore it is a primary object of the present invention to provide a rectangular monobloc optical lens that is made by steps of: cutting a sheet made from glass material into a plurality of rectangular sheet units. Then set the rectangular sheet unit into a mold for lens for hot pressing to form a monobloc glass lens. The rectangular monobloc optical lens includes a rectangular surround and a central mirror-surface area. The rectangular surround fits size of a clipping part of a lens holder for being mounted inside the lens holder. The central mirror-surface area consists of a convex aspherical surface and a concave aspherical surface while the convex aspherical surface faces an image side and the concave aspherical surface faces an object side. The manufacturing method includes the steps of: cutting a sheet made from glass material into a plurality of rectangular sheet units; then setting the rectangular sheet unit into a mold for lens for hot pressing. Thereby, the manufacturing process is simplified and the cost is reduced. Moreover, the lens has high resolution and the volume of the lens is effectively reduced so as to increase the applications of the lens.
- It is another object of the present invention to provide a rectangular monobloc optical lens whose central mirror-surface area includes a convex aspherical surface and a concave aspherical surface. The lens not only has high resolution but also has minimized volume. For example, the focal length is 1.87 mm or even less while the total length—distance from front surface of the lens to the sensing surface is 2.87 mm or even less. And diagonal line of the sensing surface of the CMOS image sensor equals or less than 1/7″
- It is a further object of the present invention to provide a method for manufacturing a rectangular monobloc optical lens comprising steps of: provide a glass sheet that is cut into a plurality of rectangular sheet units. Then the rectangular sheet unit is set into a mold for lens having a convex aspherical surface and a concave aspherical surface for hot pressing to produce a rectangular monobloc optical lens. Thus the manufacturing process is simplified and the cost is reduced.
-
FIG. 1 is a perspective view of an optical structure of an embodiment in accordance with the present invention; -
FIG. 2 (A) is a side view of the embodiment in accordance with the present invention; -
FIG. 2 (B) is a front view of the embodiment in accordance with the present invention; -
FIG. 3 is a side view of the embodiment being used in accordance with the present invention; -
FIG. 4 is a schematic drawing showing light pathway of the embodiment inFIG. 3 ; -
FIG. 5 (A) shows reference size of the embodiment inFIG. 2 (A); -
FIG. 5 (B) shows reference size of the embodiment inFIG. 2 (B); -
FIG. 6 shows reference size of the embodiment inFIG. 3 ; -
FIG. 7 is a schematic drawing of the manufacturing processes in accordance with the present invention. - Refer to
FIG. 1 ,FIG. 2 (A),FIG. 2 (B), &FIG. 3 , anoptical lens 1 in accordance with the present invention is a monobloc glass lens composed by arectangular surround 10 and a central mirror-surface area 20. Therectangular surround 10 should match aclipping part 31, of alens holder 3 so that thelens 1 can be mounted inside thelens holder 3. The central mirror-surface area 20 includes a convexaspherical surface 21 and a concaveaspherical surface 22. The convexaspherical surface 21 faces an image side while the concaveaspherical surface 22 faces side of the object. In usage, as shown inFIG. 4 , light enters from anaperture 32 on front side of thelens holder 3, firstly through the concaveaspherical surface 22 into thelens 1, then passing the convexaspherical surface 21 and out of thelens 1. Next the light passes alens protector 41 and an image is formed on sensingsurface 42 of the image sensors 4 such as CMOS or CCD. - Due to requirements such as compact size and light weight of products, the optical lens also develop toward trends of high-quality, low cost, short length, small size, and lightweight. The manufacturing processes of the
optical lens 1 according to the present invention are quite specific so that the formed lens has special structure for matching above requirements. Refer fromFIG. 5 (A),FIG. 5 (B) &FIG. 6 , the focal length of thelens 1 is about 1.87 mm or less while the total length—distance from theaperture 32 in front of thelens holder 3 to thesensing surface 42 is 2.87 mm or even less. And diagonal line of thesensing surface 42 of the CMOS image sensor 4 being used equals or less than 1/7″. As to the convexaspherical surface 21 and concaveaspherical surface 22 of the mirror-surface area 20 in accordance with the present invention, the related parameters are as followings:Concave aspherical surface 22 R = −1.131684 K = 2.199666 A4 = 2.4218476 A6 = −51.453692 A8 = 327.77628 A10 = −990.56954 A12 = 0 A14 = 0 convex aspherical surface 21 R = −0.5835097 K = −14.1246 A4 = −5.1269103 A6 = 32.985477 A8 = −193.86029 A10 = 574.86653 A12 = −763.00562 A14 = 0
Aspherical Surface Equation:
where C=1/R - X (Sag value) is the length (in mm) of a line drawn from a point on the aspheric lens surface at a distance Y from the optical axis to the tangential plane of the aspheric surface vertex,
- Y is the distance (in mm) from the optical axis
- C is the curvature; the inverse of the radius of curvature at the vertex
- K: the Conic constant
- A2-An: respectively is an aspheric coefficient, with the summation extending over n,
- Refer to
FIG. 7 , the manufacturing processes of the present invention includes following steps: - Step 1: providing a
laminated glass material 5 with homogeneous thickness; - Step 2: cutting the
laminated glass material 5 into a plurality ofrectangular sheet units 6 while each of therectangular sheet units 6 got the homogeneous thickness of theglass material 5; - Step 3: providing a
mold 7 for lens and two corresponding aspherical mold surfaces-an asphericalconcave mold surface 71 and an asphericalconvex mold surface 72 are disposed on central part of the upper and lower molds; amold cavity 73 is arranged on circumference of the asphericalconcave mold surface 71 and the asphericalconvex mold surface 72; - Step 4: set the
rectangular sheet unit 6 into the center of themold 7 for high-temperature hot pressing operating so as to make acentral area 61 of therectangular sheet unit 6 be extruded into the convexaspherical surface 21 and the concaveaspherical surface 22 of the mirror-surface area 20 by the asphericalconcave mold surface 71 and the asphericalconvex mold surface 72 of themold 7. Moreover, theperiphery 62 of therectangular sheet unit 6 is pressed inside the mold cavity and is extended outward so as to form therectangular surround 10 of thelens 1. Furthermore, the temperature for (hot pressing) ranges from about 500 Celsius degrees to 700 Celsius degrees, depending on the characters of theglass material 5. - Step 5: releasing the molded
lens 1 form themold 7. - In
Step 1, instead of conventional glass block, theglass material 5 is a thin glass plate with large area and homogeneous thickness. In an embodiment of the present invention, the thickness of theglass material 5 is 0.40 mm. - In Step 2, the
rectangular sheet unit 6 is a small-sized glass lamina with certain circumference and thickness and is able to be set inside themold 7 for hot pressing. Compared with conventional glass blocks, there is no need to run the surface-grinding and polishing processes. Since the time-consuming processes of grinding and polishing are avoided, the manufacturing cost is effectively reduced. In an embodiment of the present invention, the thickness of therectangular sheet unit 6 is equal to that of theglass material 5 while theside length 63 thereof is 1.70 mm. This is a bit smaller than theside length 11 of therectangular surround 10 of thelens 1. The difference between them is a distance for extension of therectangular sheet unit 6 while being pressed inside themold 7. - In
Step 3, the asphericalconcave mold surface 71 and the asphericalconvex mold surface 72 that corresponds to each other are respectively on central part of the upper and lower molds of themold 7 so as to extrude the convexaspherical surface 21 and concaveaspherical surface 22 of the mirror-surface area 20 of thelens 1. Themold cavity 73 is disposed on circumference of the asphericalconcave mold surface 71 or the asphericalconvex mold surface 72, corresponding to therectangular surround 10 of thelens 1. In a preferred embodiment of the present invention, themold cavity 73 can be a round slot with diameter of 2.5 mm and depth of 0.319 mm, corresponding to the thickness of therectangular surround 10 of thelens 1. - In Step 4, under operation of hot pressing, the
central area 61 of therectangular sheet unit 6 is stamped to form the convexaspherical surface 21 and the concaveaspherical surface 22 of the lens 1 s as to compose the convex-concave central mirror-surface area 20. Meanwhile, therectangular sheet unit 6 is pressed inside themold 7 so that theperiphery 62 thereof extends outward to form therectangular surround 10 of thelens 1 while the fourcorners 64 of therectangular sheet unit 6 are pressed and extended against acircular surface 74 of the circular (round)mold cavity 73 to formround corners 12 of thelens 1. Furthermore, the temperature for hot pressing ranges from about 500 Celsius degrees to 700 Celsius degrees, depending on the characters of theglass material 5. - In
Step 5, the moldedlens 1 is cooled down to 100 Celsius degrees in themold 7 and then is released from themold 7. After the temperature down to the room-temperature, the manufacturing processes of thelens 1 are finished. - Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
Claims (8)
1-9. (canceled)
10. A method for manufacturing a rectangular monobloc optical lens comprising steps of:
cutting a sheet made from glass material into a plurality of rectangular sheet units and each rectangular sheet unit having homogeneous thickness as the glass plate;
providing a mold for lens in which central part of an upper mold and a lower mold is disposed with an aspherical concave mold surface and an aspherical convex mold surface respectively, corresponding to each other and a mold cavity is arranged on circumference of the aspherical concave mold surface or the aspherical convex mold surface;
setting the rectangular sheet unit in center of the mold for hot pressing so as to make center of the rectangular sheet unit form a concave aspherical surface and a convex aspherical surface by the aspherical concave mold surface and the aspherical convex mold surface of the mold; the concave aspherical surface and the convex aspherical surface form a central mirror-surface area of the lens; periphery of the rectangular sheet unit is pressed inside the mold cavity and is extended outward so as to form a rectangular surround of the lens;
releasing the molded lens from the mold.
11. The method as claimed in claim 10 , wherein thickness of the glass material is 0.40 mm.
12. The method as claimed in claim 10 , wherein side length of the rectangular sheet unit is 1.70 mm.
13. The method as claimed in claim 11 , wherein side length of the rectangular sheet unit is 1.70 mm.
14. The method as claimed in claim 10 , wherein the mold cavity is a round cavity with diameter of 2.5 mm.
15. The method as claimed in claim 10 , wherein depth of the mold cavity is 0.319 mm.
16. The method as claimed in claim 15 , wherein depth of the mold cavity is 0.319 mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/826,395 US20070251272A1 (en) | 2006-01-18 | 2007-07-13 | Rectangular monobloc optical lens and manufacturing method thereof |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW095101830 | 2006-01-18 | ||
TW095101830A TW200728215A (en) | 2006-01-18 | 2006-01-18 | Square single-body type optical image capture glass lens and the manufacture method thereof |
US11/403,894 US7312933B2 (en) | 2006-01-18 | 2006-04-14 | Rectangular monobloc optical lens and manufacturing method thereof |
US11/826,395 US20070251272A1 (en) | 2006-01-18 | 2007-07-13 | Rectangular monobloc optical lens and manufacturing method thereof |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/403,894 Division US7312933B2 (en) | 2006-01-18 | 2006-04-14 | Rectangular monobloc optical lens and manufacturing method thereof |
Publications (1)
Publication Number | Publication Date |
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US20070251272A1 true US20070251272A1 (en) | 2007-11-01 |
Family
ID=38285260
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/403,894 Expired - Fee Related US7312933B2 (en) | 2006-01-18 | 2006-04-14 | Rectangular monobloc optical lens and manufacturing method thereof |
US11/826,395 Abandoned US20070251272A1 (en) | 2006-01-18 | 2007-07-13 | Rectangular monobloc optical lens and manufacturing method thereof |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/403,894 Expired - Fee Related US7312933B2 (en) | 2006-01-18 | 2006-04-14 | Rectangular monobloc optical lens and manufacturing method thereof |
Country Status (2)
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US (2) | US7312933B2 (en) |
TW (1) | TW200728215A (en) |
Cited By (2)
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US20110281072A1 (en) * | 2010-05-17 | 2011-11-17 | Robert Sabia | Laminable shaped glass article and method of making the same |
US11543621B2 (en) | 2017-01-26 | 2023-01-03 | Sony Semiconductor Solutions Corporation | AF module, camera module, and electronic apparatus |
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JP4600418B2 (en) * | 2007-04-20 | 2010-12-15 | 株式会社日立製作所 | Receiving apparatus and receiving method |
TW200938892A (en) * | 2008-03-11 | 2009-09-16 | E Pin Optical Industry Co Ltd | Optical glass lens and its production method |
US20100127420A1 (en) * | 2008-11-25 | 2010-05-27 | Thierry Luc Alain Dannoux | Method of forming a shaped article from a sheet of material |
TW201100900A (en) * | 2009-06-30 | 2011-01-01 | E Pin Optical Industry Co Ltd | Lens holder for stacked lens module and the method for manufacturing thereof |
TW201104297A (en) * | 2009-07-28 | 2011-02-01 | E Pin Optical Industry Co Ltd | Lens holder with alignment for stacked lens module and the manufacturing method thereof |
GB2492785A (en) | 2011-07-12 | 2013-01-16 | Oclaro Technology Plc | Lens |
DE102014110923B4 (en) * | 2014-07-31 | 2016-06-02 | Schott Ag | Shaped glass or glass ceramic article |
KR101768575B1 (en) * | 2016-09-20 | 2017-08-17 | 주식회사 소모에너지엔테크놀러지 | Long-Wavelength Infrared Camera with 54 degree Angle of View and Lens for the Carera |
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2006
- 2006-01-18 TW TW095101830A patent/TW200728215A/en not_active IP Right Cessation
- 2006-04-14 US US11/403,894 patent/US7312933B2/en not_active Expired - Fee Related
-
2007
- 2007-07-13 US US11/826,395 patent/US20070251272A1/en not_active Abandoned
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US5434707A (en) * | 1993-09-14 | 1995-07-18 | Polaroid Corporation | Shaped plastic light-polarizing lens and method of making same |
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US20110281072A1 (en) * | 2010-05-17 | 2011-11-17 | Robert Sabia | Laminable shaped glass article and method of making the same |
US11543621B2 (en) | 2017-01-26 | 2023-01-03 | Sony Semiconductor Solutions Corporation | AF module, camera module, and electronic apparatus |
Also Published As
Publication number | Publication date |
---|---|
US7312933B2 (en) | 2007-12-25 |
US20070171535A1 (en) | 2007-07-26 |
TWI333083B (en) | 2010-11-11 |
TW200728215A (en) | 2007-08-01 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: E-PIN OPTICAL INDUSTRY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SHYU, SAN-WOEI;WU, CHIEN-MIN;REEL/FRAME:019631/0482 Effective date: 20060111 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |