CN1119686C - Lens assembly for photographic camera, camera comprising such lens assembly and method for manufacture thereof - Google Patents
Lens assembly for photographic camera, camera comprising such lens assembly and method for manufacture thereof Download PDFInfo
- Publication number
- CN1119686C CN1119686C CN 99101779 CN99101779A CN1119686C CN 1119686 C CN1119686 C CN 1119686C CN 99101779 CN99101779 CN 99101779 CN 99101779 A CN99101779 A CN 99101779A CN 1119686 C CN1119686 C CN 1119686C
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- CN
- China
- Prior art keywords
- lens
- lens assembly
- camera
- framework
- shell
- 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.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title description 10
- 238000004519 manufacturing process Methods 0.000 title description 5
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 239000005341 toughened glass Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 12
- 229910052594 sapphire Inorganic materials 0.000 claims description 8
- 239000010980 sapphire Substances 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 10
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 5
- 239000004926 polymethyl methacrylate Substances 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000005355 lead glass Substances 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 210000000707 wrist Anatomy 0.000 description 1
Images
Landscapes
- Lenses (AREA)
- Lens Barrels (AREA)
Abstract
The present invention provides a lens device for cameras, including a frame (1, 21) and an optical system formed of at least one front surface lens (3, 23). The surface (3a, 23a) of the front surface lens forms the front part surface of the lens, the surface (3a, 23a) forms a contact angle &alpha of more than 120 DEG with the frame (1, 21), and the lens (3, 23) is formed of a transparent material having the hardness of equal to or more than that of tempered glass.
Description
Technical field
The present invention relates to take or photographic means, for example the lens assembly used of camera or television camera.
Background technology
This lens assembly comprises framework and at least one lens, and the latter's a surface forms the outside surface of this lens assembly.
In the lens assembly of current use, for fear of the hard thing scratch of quilt, the protection of outer surface is paid much attention to.This safeguard measure is extremely important, because the defective of lens surface quite seriously reduces the quality of taking.
The framework of this lens assembly is generally cylindrical, and stretches out and surpass lens outer surface.The formed angle of the joint face of framework and lens is generally near 90 °.Therefore, lens are subjected to the protection of frame ends.
In such structure, the joint face of framework and lens forms groove, wherein can pile up dust.For fear of this point, lens assembly is lived with the mirror cap that can extract usually.Such safeguard measure can make the banking process of dust slow down, but always can not avoid.In addition, it is careful that the cleaning of groove requires, so be difficult to thoroughly finish.
On the minor diameter lens assembly in for example being contained in the miniature camera of preparing to be attached in the wrist-watch, this shortcoming is harmful especially.
Such camera is easy to accumulate dust especially.Have been found that in use the cavity is fast reactor dust stratification dirt very.
The mirror cap of extracing that is easy to take when in addition, being difficult to load onto a kind of taking pictures for such camera.
Summary of the invention
Fundamental purpose of the present invention is under needn't emitting by the situation of scratch danger, prevents to pile up dust on the outside surface of lens.
Therefore, the present invention relates to the lens assembly that a kind of camera is used, it comprises framework and at least one lens, the latter's a surface forms the outside surface of described lens assembly, described lens assembly has following feature: described surface and framework form its value more than or equal to 120 ° connection angle, and described lens are made more than or equal to the transparent material of the hardness of tempered glass by its hardness.
Because these features, lens assembly keeps clean, owing to do not have the cavity, so can avoid the accumulation of dust.In addition, because the hardness of the lens material of formation lens assembly outside surface is more than or equal to the hardness of tempered glass, so it is actually anti scuffing.
According to favourable feature of the present invention, lens assembly comprises first front lens, second intermediate lens and the 3rd rear lens.Forward and backward lens all are convergent lenses, are made by refractive index and the high as far as possible material of Abbe number.Intermediate lens is a divergent lens, is made by the alap material of Abbe number.Such structure can be compensated aberration.
Therefore, can produce the lens assembly that length is little and optical quality is high.
Another object of the present invention is to make a kind of sturdy and durable especially and camera that quality is high.
Therefore, the invention still further relates to and a kind ofly comprise shell and comprise the camera that is fixedly mounted in the lens assembly in this shell wall that it has following feature: the part that the shell of described lens assembly at least wherein has been installed forms surface spherical in shape basically with the front surface of described lens assembly.
The invention still further relates to a kind of like this manufacture method of camera,,, still can obtain ideally continuous surface although lens assembly is arranged on the shell according to this method.
The invention still further relates to a kind of manufacture method of camera, this camera comprises shell and comprise the lens assembly that is fixedly mounted in this shell wall that this method has following feature: grind with the particle of a kind of its hardness less than the hardness of the material that forms front lens after described lens assembly has been installed on the surface that the shell of described lens assembly has been installed on it.
At last, the present invention relates to the very little camera of a kind of size, its shell is a Watchcase, and described wrist-watch back also will be described in detail with the mode of giving an example, and is called " wrist-watch camera " for simplicity.
Reading it will be appreciated that other advantages of the present invention and feature below with reference to the detailed description that embodiment did of accompanying drawing to providing with illustrative and nonrestrictive example.
Description of drawings
Fig. 1 represents the sectional view according to the lens assembly of prior art;
Fig. 2 represents the sectional view according to lens assembly of the present invention;
Fig. 3 represents the skeleton view according to wrist-watch camera of the present invention;
Fig. 4 is Fig. 3 lens assembly, along the planar I V-IV parallel and through the sectional view of optical axis with wrist-watch;
Fig. 5 represents the skeleton view of the embodiment that substitutes according to wrist-watch camera of the present invention second; And
Fig. 6 is Fig. 5 lens assembly, along the plane VI-VI parallel and through the sectional view of optical axis with wrist-watch.
Embodiment
In all are described, be positioned at the part of lens assembly front in the camera outside to be called＜preceding portion.Otherwise,＜back〉and portion then is positioned at the back of camera internal lens device.In addition, term＜radially〉and＜axially〉relate to the optical axis of lens assembly.
As shown in Figure 1, known lens assembly comprises the framework 1 of cylindrical tubular, being loaded in the framework 1 is one group of lens, and the latter comprises for example convergence front lens 3, the rear lens of assembling 4 and the intermediate lens of dispersing 5 of the front surface of one face 3 ' formation lens assembly 2.This lens assembly 2 can focus on light 18 on the photosurface 19.
The inside of framework 1 has flat and columniform surface.Each cylindrical surface that has label 6,7 and 8 guarantees the radial location of lens 3,4 and 5 respectively.Have label 9,10 and become the axial locating surfaces that are used for respectively to lens 3,5 and 4 location with each planar shaped of 11.
The known method that lens 3,4 and 5 usefulness are not shown, for example bonding or threaded collar were fixed in the framework with cooperating of the internal thread of processing in framework.
The surperficial 3a of lens 3 and flange 12 form dust incrustation 14 together and are deposited in wherein groove 13 probably.Its effect is to reduce the effective diameter of lens 3 or produce the light scattering that can influence image quality.
The angle [alpha] that is formed by surperficial 3a and flange 12 is more little, and the danger of accumulation dust is just big more.As what can see from figure, generally this angle is less than 90 °.
Shown in Figure 2 also comprises framework 1 and the optical system that is formed by same lens assembly according to lens assembly of the present invention.Framework 1 forms and is used for to the identical locating surface 6 to 11 of lens 3,4 with 5 location.The difference of the lens assembly of it and Fig. 1 is that it does not comprise flange.Otherwise framework 1 has flat front surface 15, and the surperficial 3a of it and lens 3 is continuous.
Obviously, the lens assembly that no longer reference Fig. 2 is formed prevents to collide the protection with scratch.This problem can be resolved by making front lens 3 with sapphire or tempered glass or any other its hardness greater than the transparent material of currently used object lens thereby lens that can scratch.
Except the hardness that sapphire provided, its other optical properties allow with the short high lens assembly of length workmanship.
Can obtain significant compromise with three lens.Front lens 3 and rear lens 4 all are convergent lenses, by Abbe number (v) high made.Intermediate lens 5 is divergent lenses, by the low made of Abbe number.In addition, convergent lens 3 and 4 preferably has high as far as possible refractive index, and the lens of dispersing have alap refractive index (n).
At one actually in the advantageous embodiments, front lens 3 usefulness sapphire (n=1.768, v=72.41) make, rear lens 4 usefulness PMMA (polymethylmethacrylate) (n=1.492, v=57.43) make, and intermediate lens 5 usefulness SAN (styrene-vinyl cyanide) (n=1.59 v=30) makes.Although the refractive index of SAN is higher than the refractive index of PMMA, this is a kind of be entirely satisfactory compromise at optical view.In addition, in distortion, the dangerous aspect of the distortion that causes of temperature variation or impact for example, its mechanical property provides the insurance of higher level.
That following table illustrates the compactness of being made by following material shown in Figure 2 and have a feature of the lens assembly of high optical quality: lens material R1, (mm) R2, (mm) φ, (mm) e, (mm) d, (mm) 3 sapphires, 4.69 ∞, 6.1 2.00 0.384 PMMA, 6.41 ∞ 4.7 1.00 4.055 SAN-23.8-17.5 4.0 2.00 2.25
In this table, R1 is the radius-of-curvature in lens front, and R2 is the radius-of-curvature at the lens back side, and φ be its diameter, and e is its thickness, and d is that be distance to photosurface along optical axis from lens to next lens or for 4 on lens.
For between surperficial 3a and the photosurface 19 apart from 11.68mm (millimeter), the lens assembly of making on this basis has 20 ° aperture angle, described photosurface is that the image of the object that is taken must manifest surface thereon.Focal length is 10.50mm.The size of this lens assembly and wrist-watch adapts.
Referring now to Fig. 3 and 4, the wrist-watch according to camera of the present invention is housed shown in it.It comprises the watchcase 20 of rectangle, and its top seals with the crystal glass 26 that is arranged on dial plate 27 tops, and dial plate 27 has display unit 28.Lens assembly 22 is installed in the wall of watchcase 20.It has identical feature with the described lens assembly of Fig. 2.It has front lens 23, rear lens 24 and intermediate lens 25.More precisely, lens assembly 22 be installed in can with framework 21 that Fig. 2 framework 1 is compared in, be fixed in the watchcase 20, the front surface of its axis and crystal glass 26 is substantially parallel.
As shown in Figure 4, lens 23 are outstanding slightly forward.The surperficial 21a of its surperficial 23a and framework 21 forms the obtuse angle alpha greater than 120 °.Be easy to the imagination, this angle is not allow to accumulate dust.
With reference to second embodiment shown in Fig. 5 and 6, as can be seen, to compare with the embodiment shown in 4 with Fig. 3, difference is that in fact the surperficial 23a of front lens 23 ideally is attached in the surface of watchcase 20.As a result, the external peripheral surface 20a of the watchcase 20 suitable with the intermediate member of wrist-watch enters in the spheroid 31 shown in dotted lines in Figure 5.The radius R of this spheroid is substantially equal to form the spherical radius of the front surface 23a of front lens 23.The result is, watchcase 20 and lens 23 form continuous surface, and there be not cavity, hole or the protrusion that may accumulate dust in the part of carrying lens 23 at watchcase 20.
Describe the feature of the lens assembly that satisfies these conditions shown in Fig. 4 in the following table in detail.
Lens material R1 (mm) R2 (mm) φ (mm) e (mm) d (mm)
23 sapphires 17.5-143 4.8 1.26 0.1
24 PMMA 13.1 445 6.0 2.0 3.1
25 SAN 2.64 2.15 3.5 1.74 3.3
In order to obtain as far as possible the surface of rule, it is contemplated that after watchcase that lens assembly 22 is packed into, the outside surface of watchcase is carried out last machining.The material that forms watchcase 20 and framework will have the hardness that is lower than lens 23.By suitably selecting abrasive material, can be in any difference in height of eliminating under the situation that does not change surface state between watchcase 20, framework 21 and the front lens 23.
Adopt such configuration, lens 23 can be made with tempered glass, but better with the sapphire manufacturing.Therefore, the hardness of lens 23 is enough in the end in the mechanical processing process and avoids by scratch under regular service condition.Can point out, can make lens assembly originally, and lens assembly is placed on the back of such window with the window of flat sapphire system.The test shows of having finished, price still remains unchanged basically, but optical quality reduces the growth of lens assembly length.
At material therefor is under the sapphire situation, obviously, processes lens with crystal according to such orientation, no matter how described orientation angle of incident light can both guarantee that refractive index is constant.In other words, sapphire optical axis will be identical with the axis of lens assembly.
Like this, with regard to the level of optics and mechanical property, above-mentioned camera has favourable configuration.Therefore, it can be used for severe especially condition, and does not therefore influence its performance.
Claims (4)
1. the lens assembly that camera is used comprises framework (1; 21) and along with one assemble front lens (3; 23) optical system of identical axle formation, the front surface of described front lens and framework (1; 21) form its value more than or equal to 120 ° joint angle (α); Also comprise the intermediate lens of dispersing (5; 25) and the rear lens of assembling (4; 24), it is characterized in that described intermediate lens (5; 25) be lower than by Abbe number and form front lens (3; The material of the Abbe number of material 23) is made.
2. according to the lens assembly of claim 1, it is characterized in that: described front lens (3; 23) material is selected from sapphire and tempered glass.
3. camera, comprise shell (20), it is characterized in that, also comprise according to the lens assembly (22) in the described shell of being fixedly mounted on of claim 1 (20) wall, the part of shell of described lens assembly (22) and the front surface (23a) of described front lens (23) at least wherein have been installed have been formed surface spherical in shape basically together.
4. according to the camera of claim 3, it is characterized in that: described shell (20) is the shell of wrist-watch.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH0256/98 | 1998-02-03 | ||
| CH0256/1998 | 1998-02-03 | ||
| CH25698 | 1998-02-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1233763A CN1233763A (en) | 1999-11-03 |
| CN1119686C true CN1119686C (en) | 2003-08-27 |
Family
ID=4182865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99101779 Expired - Fee Related CN1119686C (en) | 1998-02-03 | 1999-02-02 | Lens assembly for photographic camera, camera comprising such lens assembly and method for manufacture thereof |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH11281867A (en) |
| CN (1) | CN1119686C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9599787B2 (en) | 2011-12-27 | 2017-03-21 | Tera Xtal Technology Corporation | Using sapphire lens to protect the lens module |
| US9244252B1 (en) * | 2014-07-31 | 2016-01-26 | Genius Electronic Optical Co., Ltd. | Optical lens system |
| JP6910184B2 (en) * | 2017-04-12 | 2021-07-28 | マクセル株式会社 | Wide-angle lens unit and in-vehicle camera |
| CN108303782A (en) * | 2018-02-11 | 2018-07-20 | 京东方科技集团股份有限公司 | Optical system and mobile terminal |
-
1999
- 1999-02-02 CN CN 99101779 patent/CN1119686C/en not_active Expired - Fee Related
- 1999-02-03 JP JP2607299A patent/JPH11281867A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11281867A (en) | 1999-10-15 |
| CN1233763A (en) | 1999-11-03 |
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| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |