CN205038415U - Toroid astigmatic lenses piece - Google Patents
Toroid astigmatic lenses piece Download PDFInfo
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- CN205038415U CN205038415U CN201520502411.0U CN201520502411U CN205038415U CN 205038415 U CN205038415 U CN 205038415U CN 201520502411 U CN201520502411 U CN 201520502411U CN 205038415 U CN205038415 U CN 205038415U
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- toroid
- lens
- curved surface
- summit
- ring curved
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Abstract
The utility model discloses a toroid astigmatic lenses piece. The front surface of lens does not have diopter difference, does not have the toroid that different curvatures changes in two mutually perpendicular direction for the summit, and the rear surface is the ring curved surface, is formed by the mould pouring that has toroid astigmatic lenses piece shape cavity. The utility model provides a toroid astigmatic lenses piece will play the ring curved surface and rear surface and the front surface of toroid dispersion design at the lens of correcting the effect of astigmatism eye, not only have light in weight, even, the good advantage of image quality of the peripheral thickness of lens, overcome the general toroid astigmatic lenses piece's of mould pouring the difficult processing of die holder convex curved surface, the shortcoming that the processing equipment expected much, the yield is hanged down moreover, greatly reduced the preparation cost.
Description
Technical field
The utility model relates to the shaping lens of a kind of die casting, particularly relates to a kind of toroid (ATORIC) astigmatic lenses.
Background technology
The lens of conventional corrective astigmatic eyes is ring toroidal lens, and one, two surfaces of lens are sphere, and one is ring curved surface, and usual spectacles industry is referred to as sphere astigmatoscope.Play the title outward loose eyeglass of ring curved surface at outside surface of astigmatism eye effect, play ring curved surface loose eyeglass in the title of inside surface of astigmatism eye effect.Interior loose eyeglass is all better than outer loose eyeglass in outward appearance or image quality, so loose eyeglass in generally all adopting.Sphere astigmatoscope have the shortcoming that ophthalmic lens edge is in uneven thickness, eyeglass is thick, weight is large.
Chinese invention patent CN1237366C discloses a kind of Super-torus astigmatic glasses lens, and its toroidal foundation line is high order aspheric surface curve, and the vertical direction of baseline is spherical curve.The function of ring curved surface astigmatism eye and the thinning eyeglass of aspheric surface, the function that improves picture element are combined on one face by this toroid, and are referred to as astigmatism face.The Super-torus astigmatic glasses lens provided can thinning eyeglass, improves image quality, and can alleviate the not uniform thickness of lens edge, but requires high to process equipment, and cost is high.
Chinese invention patent CN1105315C discloses a kind of concentric year torus lens for astigmatism eye, and one surface is double-curved surface, described ring curved surface namely, and another side is concentric year torus.Due to the rotational symmetry of concentric year torus, this kind of eyeglass can not alleviate the not uniform thickness of lens edge.Utility model patent CN202011091U discloses a kind of preparation die for astigmatic lenses, a curved surface is had at least to be double cone face in the upper bolster of mould and die shoe, use the lens of die casting to be applicable to large-scale production, have the advantages that cost reduces greatly compared with garage machining lens.But for astigmatic lenses, owing to usually all adopting interior loose eyeglass, astigmatism face certainly will be processed on die shoe convex surface.Than concave curved surface, milling and the polishing required time of convex surface are long, and difficulty is comparatively large, high to the requirement of process equipment.Adopt the toroidal function form that provides of prior art to make lower mould seat, on convex surface, everywhere not etc., difficulty of processing is just larger, and face type is easily out of shape, and yield rate is low, and production cost is high for curvature.
Sphere astigmatic lenses thickness is thick, and edge became uneven is even.And toroid astigmatic lens disclosed in prior art, although overcome above-mentioned shortcoming, have higher requirement to process equipment, production cost is high.Even if adopt the mode of die casting to process, owing to processing toroid on convex surface, curved surface is easily out of shape, and yield rate is low, and production cost is still higher.
Summary of the invention
The deficiency that the utility model exists for prior art, one is provided not only to possess the thinning eyeglass of existing Super-torus astigmatic glasses lens, image quality is high, the advantage of lens edge not uniform thickness can be alleviated, and the difficulty of processing of mould convex surface in mould preparation process can be effectively reduced, greatly reduce the Super-torus astigmatic glasses lens of production cost.
Realize the purpose of this utility model technical scheme and be to provide a kind of Super-torus astigmatic glasses lens, comprise front surface and the rear surface of lens; Described front surface is the toroid of a summit without diopter difference,
xyzcartesian coordinates fastens the concave curved surface described in definition,
zaxle passes concave curved surface summit along inter normal,
xoyplane cross concave curved surface summit and with
zvertically, described toroid is determined by with minor function:
；
Wherein,
cfor the curvature on toroid summit,
k x for
xthe conic constant in direction,
k y for
ythe conic constant in direction, lens is the lens of myopia band astigmatism, then
k x > 0,
k y > 0, and
k x <
k y ; Lens is the lens of long sight band astigmatism, then
k x < 0,
k y < 0, and
;
a 4 ,
a 6 ,
a 8 ,
a 10 ,
a 12 be respectively
xthe high-order term coefficient in direction,
b 4 ,
b 6 ,
b 8 ,
b 10 ,
b 12 be respectively
ythe high-order term coefficient in direction; The value order of magnitude scope of described high-order term coefficient:
a 4 with
b 4 be 10
-7~ 10
-6,
a 6 with
b 6 be 10
-11~ 10
-10,
a 8 with
b 8 be 10
-15~ 10
-13,
a 10 with
b 10 be 10
-18~ 10
-17,
a 12 with
b 12 be 10
-22~ 10
-21;
Described rear surface is a ring curved surface,
xyzcartesian coordinates fastens the ring curved surface described in definition,
zaxle passes ring curved surface summit along inter normal,
xoyplane cross ring curved surface summit and with
zaxle is vertical, described ring curved surface with
xdirection is standard shaft direction, determines by with minor function:
；
Wherein,
c x for ring curved surface
xthe curvature in direction,
c y for ring curved surface
ythe curvature in direction,
c x <
c y .
Technical solutions of the utility model also comprise a kind of Super-torus astigmatic glasses lens obtained by above-mentioned preparation method.
Compared with prior art, the beneficial effects of the utility model are:
1, the Super-torus astigmatic glasses lens that provides of the utility model, toroid and astigmatism face are dispersed in former and later two on the surface, front surface be summit without diopter difference, the special toroid in two perpendicular direction with not identical asphericity coefficient, play thinning eyeglass, improve the effect of image quality; Rear surface is common ring curved surface, plays astigmatism.Lens is shaping by die casting, upper bolster concave curved surface processes toroid, die shoe convex surface is processed ring curved surface, upper bolster and die shoe respective axes matched moulds, shaping astigmatic lenses has lightweight, that lens periphery thickness is comparatively even, image quality is good advantage.
2, the Super-torus astigmatic glasses lens that provides of technical solutions of the utility model, adopt toroid processing on the upper bolster concave curved surface of mould, for convex surface, difficulty of processing reduces.Further, this special toroid has the feature of vertex curvature indifference, further reduces difficulty of processing and improves yield rate.And ring Machining of Curved Surface is on the die shoe convex surface of mould, identical with the die shoe preparation method of the sphere astigmatic lens that common die is poured into a mould, can process with spherical surface miling-grinding machine, technical maturity.Spherical surface miling-grinding machine price is tens thousand of unit only, than the free form surface numerically-controlled machine for processing the millions of unit of toroidal price, equipment investment only takes about one of percentage, greatly can reduce corresponding extraordinary mould production cost and difficulty, thus reduce eyeglass manufacturing cost and the universalness production contributing to this product.
Accompanying drawing explanation
The concave lens mould structure cross-sectional schematic that Fig. 1 provides for the utility model embodiment;
The hyperopic lens mould structure cross-sectional schematic that Fig. 2 provides for the utility model embodiment;
The myopic astigmatism eyeglass that Fig. 3 provides for the utility model embodiment and with the standard shaft directional profile rise figure of prescription sphere astigmatic lens, the section rise figure of vertical direction and lens edge one week thickness profiles figure;
The hypermetropic astigmatism eyeglass that Fig. 4 provides for the utility model embodiment and with the standard shaft directional profile rise figure of prescription sphere astigmatic lens, the section rise figure of vertical direction, and lens edge one week thickness profiles figure;
In figure, 1, upper bolster; 11, the concave curved surface of shaped glasses sheet front surface; 2, die shoe; 21, the convex surface of shaped glasses sheet rear surface.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
Embodiment 1:
The prescription of the myopic astigmatism mirror that the present embodiment provides is: apex sphere luminosity-6D, astigmatism-2D, axially 45 °, refractive index n=1.598, eyeglass bore 70 millimeters.Astigmatism axial direction in prescription only works at assembled glasses, does not need to consider in design process.Choosing front surface summit place diopter is 1D, then rear surface ring curved surface standard shaft direction (
xdirection) diopter is 7D,
ydirection diopter is 9D.
The present embodiment provides a kind of astigmatic lenses, and its front surface is a kind of special toroid,
xyzcartesian coordinates fastens definition toroid,
zaxle passes toroid summit along inter normal,
xoyplane cross toroid summit and with
zvertically, toroidal shape is determined by following formula (1):
（1）
In formula,
z a represent position (
x,
y) point on place's toroid arrives
xoythe vertical range of plane, is called the rise of toroid curved surface,
cfor the curvature on toroid summit,
k x for
xthe conic constant in direction,
k y for
ythe conic constant in direction,
a 4 ~
a 12 ,
b 4 ~
b 12 be respectively
xdirection and
ythe high-order term coefficient in direction.The toroid determined by above-mentioned formula, the curvature in its summit place all directions is all mutually
c, exist from vertex
x,
ytwo vertical direction outwards stretch with different Curvature varying, and conic constant is respectively
k x with
k y , high-order term coefficient is respectively
a 4 ,
a 6 ,
a 8 ,
a 10 ,
a 12 with
b 4 ,
b 6 ,
b 8 ,
b 10 ,
b 12 .
During design, choosing of conic constant and high-order term coefficient, toroid summit curvature is in any direction
c, ensure that the apex sphere luminosity at eyeglass vision area center and astigmatism can meet lens prescription.Simultaneously in order to eyeglass can have good image quality, also add in toroid formula
xthe high-order term in direction and
ythe high-order term in direction, the order of magnitude of high-order term coefficient is:
Applied Optics Design software carries out toroidal optimal design.Optimal design target not only will be considered thinning lens edge thickness and slow down the uneven of lens edge thickness, also to consider dioptric optical value that the inner region of eyeglass field of view center 10 millimeters keeps stable, have good imaging definition, and offset the error effect processed especially polishing process and can produce.The result of optimal design obtains a satisfactory toroid, provides the value of conic constant and high-order term coefficient simultaneously.
The rear surface of astigmatic lenses is ring curved surface,
xwith
ytwo mutually perpendicular side's upward curvature are different,
xyzcartesian coordinates fastens definition ring curved surface,
zaxle passes ring curved surface summit along inter normal,
xoyplane cross ring curved surface summit and with
zvertically, the face shape of ring curved surface is determined by following formula (2):
（2）
In formula,
z t represent position (
x,
y) point on place's ring curved surface arrives
xoythe vertical range of plane, is called the rise of ring curved surface,
c x for curved surface
xthe curvature in direction,
c y for curved surface
ythe curvature in direction.
c x <
c y ,
xdirection is referred to as the standard shaft direction of ring curved surface.
c x -
c y value is determined by the astigmatism value in eyeglass lens prescription.
c x with
c y absolute size then will by the curvature of the apex sphere shading value in eyeglass lens prescription and lens front surface
cdetermine.Due to
c x <
c y , so ring curved surface exists
xdegree of crook on direction comparatively
ydirection is little, if front surface is a sphere, then causes the became uneven of lens edge even.Alleviate the even object of the became uneven of lens edge to reach, front surface also must be
xdegree of crook on direction is less than
ydegree of crook on direction, in technical solution of the present invention, adopts
x,
yconic constant on direction
k x ,
k y not identical toroid design.
For the lens of myopia band astigmatism, the curvature of rear surface is greater than the curvature of front surface, and the thickness of thinning lens edge, the aspheric surface that can be greater than zero in front surface design conic constant, to increase the degree of crook at edge.The became uneven that rotational symmetric aspheric surface still can not slow down lens edge is even, so the present invention adopts
x,
yon direction
k x > 0,
k y > 0, and
k x <
k y toroid, the degree of crook of front surface is increased, exists simultaneously
xdegree of crook on direction comparatively
ydirection is little, can the thickness of thinning lens edge, and the became uneven that can slow down again lens edge is even.
For the lens of long sight band astigmatism, the curvature of rear surface is less than the curvature of front surface, reduce the center thickness of eyeglass, can in front surface design minus aspheric surface of conic constant, to reduce the degree of crook at edge.Equally, the became uneven that rotational symmetric aspheric surface can not slow down lens edge is even, so the present invention adopts
x,
yon direction
k x < 0,
k y < 0, and
toroid, the degree of crook of front surface is reduced, exists simultaneously
xthe amplitude that degree of crook on direction reduces comparatively
ydirection is large, and can reduce the center thickness of eyeglass, the became uneven that can slow down again lens edge is even.
In the present embodiment, vertex curvature
, rear surface both direction curvature is respectively
,
.
By optimal design, obtain
,
.
。
The Super-torus astigmatic glasses lens that the utility model provides is shaped by die casting, and see accompanying drawing 1, it is the concave lens mould cross-sectional schematic that the present embodiment provides; Mould comprises upper bolster 1 and die shoe 2, and upper bolster has a concave curved surface 11 for shaped glasses sheet front surface, namely upper bolster is processed with a concave curved surface according to above-mentioned toroid formula design rise; Die shoe has a convex surface 21 for shaped glasses sheet rear surface, namely die shoe is processed with a convex surface according to above-mentioned ring curved surface formula design rise.The summit of upper bolster concave curved surface and die shoe convex surface is at a distance of certain distance edge contact matched moulds, and form the mould with Super-torus astigmatic glasses lens shaped hollow, summit distance is apart the center thickness of shaped glasses sheet.Upper bolster and die shoe all will be carved with characterize ring curved surface standard shaft direction (
xdirection) axis, during matched moulds, the axis of upper bolster and die shoe contacts with each other aligning, guarantees that lens front surface corresponding to mould internal cavity shape exists
xdegree of crook on direction is less than
ydegree of crook on direction, reaches and slows down the even object of astigmatic lenses edge became uneven.
Toroid and astigmatism face are dispersed in former and later two on the surface by the utility model, front surface be summit without diopter difference, the special toroid in two perpendicular direction with not identical asphericity coefficient, play thinning eyeglass, improve the effect of image quality; Rear surface is common ring curved surface, plays astigmatism.Lens is shaping by die casting, upper bolster concave curved surface processes toroid, die shoe convex surface is processed ring curved surface, upper bolster and die shoe respective axes matched moulds, shaping astigmatic lenses has lightweight, that lens periphery thickness is comparatively even, image quality is good advantage.
Toroid processing is on the upper bolster concave curved surface of mould, and for convex surface, difficulty of processing reduces.Further, this special toroid has the feature of vertex curvature indifference, further reduces difficulty of processing and improves yield rate.
Ring Machining of Curved Surface is on the die shoe convex surface of mould, identical with the die shoe preparation method of the sphere astigmatic lens that common die is poured into a mould, and can process, technical maturity with spherical surface miling-grinding machine.Spherical surface miling-grinding machine price is tens thousand of unit only, and than the free form surface numerically-controlled machine for processing the millions of unit of toroidal price, equipment investment only takes about one of percentage.Therefore, the Super-torus astigmatic glasses lens of the die casting of the utility model design and preparation, can reduce production cost greatly.
Draw as calculated, thinning 0.63 millimeter of the lens edge average thickness of the present embodiment, the most very much not uniform thickness of eyeglass alleviates 0.32 millimeter, alleviates degree 13.1%.
See accompanying drawing 3, be expressed as the present embodiment eyeglass standard shaft direction and the surperficial rise of its vertical direction and the change curve of lens edge thickness.The response curve of identical prescription sphere astigmatoscope is shown in broken lines in the drawings, compares to give.By two width rise curve maps in figure, namely lens section shape figure can find out, the toroid design of front surface adds the degree of crook of curved surface, and standard shaft direction (
xdirection) degree of crook comparatively its vertical direction (
ydirection) little.Lens edge thickness figure in Fig. 3 represents, this kind of design makes lens edge thickness reduce, and the not uniform thickness degree at edge slows down.
Table 1 be the present embodiment with identical prescription myopic spherical astigmatic lens along standard shaft direction with perpendicular to the axial curvature of field data of base, the curvature of field with the equidirectional far point sphere of eyeglass for benchmark.As seen from Table 1, this kind design toroid myopic astigmatism eyeglass the curvature of field comparatively sphere astigmatic lens have greatly improved, its curvature of field overlaps substantially with the far point sphere of eyeglass respective direction.
Table 1
。
Embodiment 2
See accompanying drawing 2, it is the hyperopic lens mould cross-sectional schematic that the present embodiment provides; Mould comprises upper bolster 1 and die shoe 2, and upper bolster has a concave curved surface 11 for shaped glasses sheet front surface, namely upper bolster is processed with the concave curved surface of toroid formula (1) the design rise that provides by embodiment 1; Die shoe has a convex surface 21 for shaped glasses sheet rear surface, namely die shoe is processed with a convex surface by ring curved surface formula (2) design rise.
The prescription of the hypermetropic astigmatism mirror that the present embodiment provides is: apex sphere luminosity 4D, astigmatism-1D, axially 75 °, refractive index n=1.598, eyeglass bore 70 millimeters.Astigmatism axial direction in prescription only works at assembled glasses, does not need to consider in design process.Choosing front surface vertex power is 5D, then rear surface ring curved surface standard shaft direction (
xdirection) diopter is 1D,
ydirection diopter is 2D.
Front surface toroid vertex curvature
, rear surface both direction curvature is respectively
,
.By optimal design, obtain
,
.
。
Draw as calculated, thinning 0.37 millimeter of the lens center thickness of the present embodiment, the most very much not uniform thickness of eyeglass alleviates 0.13 millimeter, and because hyperopic lens edge is very thin, alleviation degree also reaches 12.4%.
See accompanying drawing 4, be expressed as the present embodiment eyeglass standard shaft direction and the surperficial rise of its vertical direction and the change curve of lens edge thickness.The response curve of identical prescription sphere astigmatoscope is shown in broken lines in the drawings, compares to give.By two width rise curve maps in figure, namely lens section shape figure can find out, the toroid design of front surface reduces the degree of crook of curved surface, and standard shaft direction (
xdirection) reduction degree comparatively its vertical direction (
ydirection) obviously.The present embodiment lens edge minimum thickness is set to 1.1 millimeters, and one week thickness profiles such as the lens edge thickness figure in Fig. 4 in edge represents, in figure, dotted line is the edge thickness curve of identical prescription Hyperopic sphere astigmatoscope, and edge minimum thickness is also 1.1 millimeters.Calculate thinning compared with sphere astigmatoscope 0.37 millimeter of the lens center thickness of the present embodiment.Visible, this kind of design makes the center thickness of hypermetropic astigmatism eyeglass thinning, and the not uniform thickness degree at edge slows down.
See table 2, for the present embodiment and identical prescription Hyperopic sphere astigmatic lens are along standard shaft direction with perpendicular to the axial curvature of field data of base, the curvature of field with the equidirectional far point sphere of eyeglass for benchmark.As seen from Table 2, this kind design toroid hypermetropic astigmatism eyeglass the curvature of field comparatively sphere astigmatic lens have greatly improved, substantially overlap along the axial curvature of field of base with the far point sphere of eyeglass respective direction.
Table 2
。
The toroid astigmatic lens mould that table 3 provides for the utility model embodiment 1 and 2 and the equipment needed for prior art toroid astigmatic lens mould, process statistics that is consuming time and qualification rate.
Table 3
。
Data listed by table 3, though the utility model toroid astigmatic lens also needs when preparing Mould Machining to carry out milling with free form surface numerically-controlled machine, but because toroid is that processing is on upper bolster concave surface, relatively the prior art toroid astigmatic lens of processing on die shoe convex surface prepares mould, process time used saves half, and qualification rate also brings up to 90% by 60 ~ 70%.Be combined the consuming time of the spherical surface miling-grinding machine of low price, and the polishing time of Mould Machining, the preparation cost that can estimate the toroid astigmatic lens mould that the utility model provides at least can reduce by 40% ~ 50%.
Claims (1)
1. a Super-torus astigmatic glasses lens, comprises front surface and the rear surface of lens, it is characterized in that:
Described front surface is the toroid of a summit without diopter difference,
xyzcartesian coordinates fastens the toroid described in definition,
zaxle passes toroid summit along inter normal,
xoyplane cross toroid summit and with
zvertically, described toroid is determined by with minor function:
；
Wherein,
cfor the curvature on toroid summit,
k x for
xthe conic constant in direction,
k y for
ythe conic constant in direction, lens is the lens of myopia band astigmatism, then
k x > 0,
k y > 0, and
k x <
k y ; Lens is the lens of long sight band astigmatism, then
k x < 0,
k y < 0, and
;
a 4 ,
a 6 ,
a 8 ,
a 10 ,
a 12 be respectively
xthe high-order term coefficient in direction,
b 4 ,
b 6 ,
b 8 ,
b 10 ,
b 12 be respectively
ythe high-order term coefficient in direction; The value order of magnitude scope of described high-order term coefficient:
a 4 with
b 4 be 10
-7~ 10
-6,
a 6 with
b 6 be 10
-11~ 10
-10,
a 8 with
b 8 be 10
-15~ 10
-13,
a 10 with
b 10 be 10
-18~ 10
-17,
a 12 with
b 12 be 10
-22~ 10
-21;
Described rear surface is a ring curved surface,
xyzcartesian coordinates fastens the ring curved surface described in definition,
zaxle passes ring curved surface summit along inter normal,
xoyplane cross ring curved surface summit and with
zaxle is vertical, described ring curved surface with
xdirection is standard shaft direction, determines by with minor function:
；
Wherein,
c x for ring curved surface
xthe curvature in direction,
c y for ring curved surface
ythe curvature in direction,
c x <
c y .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520502411.0U CN205038415U (en) | 2015-07-13 | 2015-07-13 | Toroid astigmatic lenses piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520502411.0U CN205038415U (en) | 2015-07-13 | 2015-07-13 | Toroid astigmatic lenses piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205038415U true CN205038415U (en) | 2016-02-17 |
Family
ID=55297308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520502411.0U Withdrawn - After Issue CN205038415U (en) | 2015-07-13 | 2015-07-13 | Toroid astigmatic lenses piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205038415U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815306A (en) * | 2022-04-20 | 2022-07-29 | 苏州明世光学科技有限公司 | Free-form surface monofocal astigmatic lens for hyperopia correction and design method |
-
2015
- 2015-07-13 CN CN201520502411.0U patent/CN205038415U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114815306A (en) * | 2022-04-20 | 2022-07-29 | 苏州明世光学科技有限公司 | Free-form surface monofocal astigmatic lens for hyperopia correction and design method |
| CN114815306B (en) * | 2022-04-20 | 2024-04-16 | 苏州明世光学科技有限公司 | Free-form surface monofocal astigmatic lens for correcting hyperopia and design method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160217 Effective date of abandoning: 20180323 |