CN103940377A - Optical lens ball center deviation measurement device - Google Patents
Optical lens ball center deviation measurement device Download PDFInfo
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- CN103940377A CN103940377A CN201410115044.9A CN201410115044A CN103940377A CN 103940377 A CN103940377 A CN 103940377A CN 201410115044 A CN201410115044 A CN 201410115044A CN 103940377 A CN103940377 A CN 103940377A
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Abstract
The invention relates to an optical lens ball center deviation measurement device, and belongs to the field of optical systems. The technical problems that in the prior, a device for optical lens ball center deviation measurement is not high enough in measurement accuracy or cannot measure eccentricity of a mirror surface with the larger curvature radius, and dead zones exist in the measurement range are solved. The optical lens ball center deviation measurement device comprises an optical lighting module, a beam splitter mirror, an optical alignment lens group, an optical focusing lens group, a photoelectric detector, a linear displacement sensor, a mechanical leveling table, a precision rotating table, a linear displacement mechanism and a main control computer. According to the optical lens ball center deviation measurement device, the higher measurement precision can be achieved, and the ball center deviation measurement of optical lenses with various curvature radiuses can be achieved at the same time.
Description
Technical field
The present invention relates to a kind of optical lens centre of sphere deviation measurement device, belong to field of optical systems.
Background technology
In optical system, in the time that the centre of sphere of optical mirror plane departs from optical axis, will affect the optical property of optical system, therefore, and debuging in process of optical lens, must the strict centre of sphere deviation of controlling optical lens.
At present, have the equipment of measuring for optical lens centre of sphere deviation, these equipment adopt two kinds of technical schemes: a kind of scheme is the mode that adopts optical lens interior focusing, spacing in adjusting optical measurement lens group between positive lens and negative lens, change the position of light beam focus point, thereby measure the offset of different curvature radius minute surface.But this scheme, because the spacing between positive negative lens changes, causes the enlargement ratio marked change of optical measurement lens group, thereby in the time calculating the offset of tested eyeglass, produces larger error.Another kind of scheme is the mode that adopts switchable optics camera lens, by changing the optical lens of different focal, changes the position of light beam focus point, thereby measures the offset of different curvature radius minute surface.Although this scheme measuring accuracy is higher, but because the focal length of the optical lens being switched is fixed value, and limited amount, thereby determine the scope of light beam focus point, can only measure the minute surface offset of the centre of sphere within the scope of this, causing this scheme cannot measure the minute surface offset compared with larger radius of curvature, there is blind area in measurement range.
Optical lens centre of sphere deviation measuring equipment based on above two kinds of technical schemes, due to technological deficiency separately, can not meet the requirement that the optical lens high precision in a lot of fields is debug.
Summary of the invention
The object of the invention is to solve the device measuring precision of measuring for optical lens centre of sphere deviation in prior art not high enough, or cannot measure the technical matters that has blind area compared with the minute surface offset of larger radius of curvature, measurement range, a kind of optical lens centre of sphere deviation measurement device and method are provided.
Optical lens centre of sphere deviation measurement device of the present invention comprises: optical illumination module, spectroscope, optical alignment lens group, optical focus lens group, photodetector, linear displacement transducer, mechanical leveling platform, precision rotation platform, straight-line displacement mechanism and main control computer, and described optical illumination module, spectroscope, optical alignment lens group, optical focus lens group, photodetector and linear displacement transducer form optical measuring head; Described optical focus lens group is detachable, in the time that optical focus lens group is pulled down, the cross curve target light beam that optical illumination module produces focuses on the position of the image of spherical center of tested minute surface successively through spectroscope and optical alignment lens group, cross curve target light beam, after tested mirror-reflection, focuses on the target surface of photodetector successively through optical alignment lens group and spectroscope; In the time that optical focus lens group is installed, the cross curve target light beam that optical illumination module produces focuses on the position of the image of spherical center of tested minute surface successively through spectroscope, optical alignment lens group and optical focus lens group, cross curve target light beam, after tested mirror-reflection, focuses on the target surface of photodetector successively through optical focus lens group, optical alignment lens group and spectroscope; The light signal of the cross curve target light beam reflecting is converted to electric signal by described photodetector, forms cross curve image, and by cross curve image transmission to main control computer; Described linear displacement transducer is used for measuring the diverse location of optical alignment lens group, and sends this positional information to main control computer; Described mechanical leveling platform is connected on precision rotation platform, for regulating the position relationship between the optical axis of tested optical lens and the rotation of precision rotation platform; Described precision rotation platform drives the axis rotation of tested optical lens around precision rotation platform; Described straight-line displacement mechanism drives optical measuring head to make the rectilinear motion of vertical direction, and measures the position of optical measuring head, and sends this positional information to main control computer; Described main control computer is used for calculating centre of sphere deviation.
Further, described optical illumination module comprises light source, frosted glass and cross curve target.
Further, described spectroscope is right angle cemented prism, the target surface of photodetector is positioned at spectroscopical upside, and cross curve target is positioned at spectroscopical right side, and the target surface of photodetector equals the distance of cross curve target to the right surface of spectroscope to the distance of spectroscope upper surface.
Further, the position of described optical alignment lens group can regulate.
Further, described optical focus lens group can be switched the optical lens of different focal.
Further, the process of described main control computer calculating centre of sphere deviation is:
Step 1, centre of sphere deviation Survey Software, according to radius-of-curvature, minute surface interval and the eyeglass refractive index of each minute surface of the tested camera lens of input, are calculated centre of sphere position and the vertical axle magnification β 2 of all thereon mirror images image of spherical center afterwards relatively of tested each minute surface of camera lens;
Step 2, centre of sphere deviation Survey Software are according to the tested minute surface the calculating position of its upper all mirror images image of spherical center afterwards relatively, provide the positional information of optical alignment lens group, or provide the focus information of optical focus lens group and regulate the positional information of straight-line displacement mechanism;
The vertical axle magnification β of the positional information calculation optical measuring head of the optical collimation lens group that step 3, centre of sphere deviation Survey Software transmit according to linear displacement transducer
1, or according to the vertical axle magnification β of the focal length calculating optical measuring head of the optical focus lens group using
1;
Step 4, centre of sphere deviation Survey Software are processed by the cross curve image information to obtaining, and calculate the diameter S of cross curve image deferent;
Step 5, centre of sphere deviation Survey Software be the centre of sphere line deviation α of through type calculating minute surface again:
In formula (1), β=β
1β
2;
Or through type (2) calculates the centre of sphere angular displacement value χ of minute surface:
In formula (2), R is the radius-of-curvature of tested minute surface, β=β
1β
2.
Beneficial effect of the present invention:
(1) the present invention has adopted the mode of operation that cutaway and interior focusing combine: the mode of operation of cutaway, in measuring process, there are not the parts of motion in the optical lens group in optical measuring head, can accurately obtain the vertical axle enlargement ratio of optical lens group in optical measuring head; Interior focusing mode of operation, has increased the focussing distance of optical alignment lens group in optical measuring head, can accurately obtain in optical measuring head the optical lens group axle enlargement ratio that hangs down, and therefore, the present invention can reach higher minute surface misalignment measurement precision;
(2) the present invention can be used for the optical lens misalignment measurement of various radius-of-curvature, does not exist and measures blind area, has solved the problem that measuring accuracy and curvature mirror radius measurement scope can not be taken into account, and is widely used.
Brief description of the drawings
Figure 1 shows that the structural representation of optical lens centre of sphere deviation measurement device of the present invention;
In Fig. 1,
The 1st, optical illumination module;
The 101st, light source;
The 102nd, frosted glass;
The 103rd, cross curve target;
The 2nd, spectroscope;
The 3rd, optical alignment lens group;
The 4th, optical focus lens group;
The 5th, photodetector;
The 6th, linear displacement transducer;
The 7th, mechanical leveling platform;
The 8th, precision rotation platform;
The 9th, straight-line displacement mechanism;
The 10th, main control computer;
The 11st, optical measuring head;
The 12nd, tested optical lens.
Embodiment
Below in conjunction with brief description of the drawings the specific embodiment of the present invention.
As shown in Figure 1, optical lens centre of sphere deviation measurement device of the present invention comprises: optical illumination module 1, spectroscope 2, optical alignment lens group 3, optical focus lens group 4, photodetector 5, linear displacement transducer 6, mechanical leveling platform 7, precision rotation platform 8, straight-line displacement mechanism 9 and main control computer 10.Wherein, optical illumination module 1, spectroscope 2, optical alignment lens group 3, optical focus lens group 4, photodetector 5 and linear displacement transducer 6 form optical measuring head 11.
Optical illumination module 1, in optical lens centre of sphere deviation measuring process, provides uniform cross curve target light beam.Optical illumination module 1 comprises light source 101, frosted glass 102 and cross curve target 103; Light source 101, can select Halogen lamp LED or high-brightness LED; Frosted glass 102, plays even light action; Cross curve target 103 provides thin cross curve target, and this target is generally bright line dark background.
Spectroscope 2 makes the reflection of cross drone beam section, the part transmission within the scope of service band, and spectroscope 2 is generally formed by two right-angle prism gummeds, plates spectro-film on cemented surface.
The position of optical alignment lens group 3 can regulate, and can modulate generation directional light, also can move up and down.
Optical focus lens group 4 is detachable, and in the time measuring the minute surface of different curvature radius, can as required optical focus lens group 4 be switched to the optical lens of different focal, in the time that optical focus lens group 4 is installed, optical alignment lens group 3 is adjusted to the position that produces directional light, the cross curve target light beam that optical illumination module 1 produces reflexes to optical alignment lens group 3 through spectroscope 2, optical alignment lens group 3 is parallel beam by cross curve target optical beam transformation, focal length by switchable optics amasthenic lens group 4 also regulates the position of optical measuring head 11 by straight-line displacement mechanism 9, make parallel beam focus on the position of the image of spherical center of tested minute surface through optical focus lens group 4, cross curve target light beam is after tested mirror-reflection, another mistake is to process optical focus lens group 4, optical alignment lens group 3 and spectroscope 2, focus on the target surface of photodetector 5, in the time that optical focus lens group 4 is pulled down, the cross curve target light beam that optical illumination module 1 produces reflexes to optical alignment lens group 3 through spectroscope 2, by regulating the position of optical alignment lens group 3, make cross curve target focus on the position of the image of spherical center of tested minute surface, cross curve target light beam is after tested mirror-reflection, reverse through optical alignment lens group 3 and spectroscope 2, focus on the target surface of photodetector 5.
Photodetector 5 is connected with main control computer 10, and the light signal of the cross curve target light beam reflecting is converted to electric signal by photodetector 5, forms cross curve image, and sends this cross curve image information to main control computer 10; Photodetector 5 can regulate gain and time shutter; The target surface of photodetector 5 is positioned at the upside of spectroscope 2, and cross curve target 103 is positioned at the right side of spectroscope 2, and the target surface of photodetector 5 is to the distance of spectroscope 2 upper surfaces, equals the distance of cross curve target 103 to spectroscope 2 right surfaces.
Linear displacement transducer 6 is connected with main control computer 10 with optical alignment lens group 3 respectively, and linear displacement transducer 6 is for measuring in real time the diverse location of optical alignment lens group 3, and sends this positional information to main control computer 10.
Machinery leveling platform 7 is connected on precision rotation platform 8, in measuring process, tested optical lens 12 is placed on the center of mechanical leveling platform 7, by regulating mechanical leveling platform 7, adjusts the position relationship between the optical axis of tested optical lens 12 and the rotation of precision rotation platform 8.
Precision rotation platform 8, in measuring process, drives the axis rotation of tested optical lens 12 around precision rotation platform 8.According to the requirement of optical lens centre of sphere deviation measuring accuracy, select the rotation platform of corresponding precision.
Straight-line displacement mechanism 9 is connected with optical measuring head 11, main control computer 10 respectively, in measuring process, straight-line displacement mechanism 9 drives optical measuring head 11 to make the rectilinear motion of vertical direction, measures the position of optical measuring head 11, and sends this positional information to main control computer 10.
Main control computer 10 moves centre of sphere deviation Survey Software, Load Images capture card on mainboard; Image pick-up card gathers the cross curve image information of photodetector 5;
Centre of sphere deviation Survey Software, according to radius-of-curvature, minute surface interval and the eyeglass refractive index of each minute surface of the tested camera lens 12 of input, is calculated centre of sphere position and the vertical axle magnification β of all thereon mirror images image of spherical center afterwards relatively of each minute surface
2;
Centre of sphere deviation Survey Software is according to the relatively position of its upper all mirror images image of spherical center afterwards of tested minute surface, provide the position of optical alignment lens group 3, or provide the focus information of the optical focus lens group 4 that select and regulate the positional information of straight-line displacement mechanism 9, by the position of the image of spherical center that focuses on tested sphere of cross curve target;
The positional information of the optical collimation lens group 3 that centre of sphere deviation Survey Software transmits according to linear displacement transducer 6, vertical axle magnification β 1 that can calculating optical measuring head 11; Or according to the focal length of used optical focusing lens group 4, vertical axle magnification β 1 that can calculating optical measuring head 11;
Centre of sphere deviation Survey Software is processed by the cross curve image to obtaining, and calculates the diameter S of the deferent of cross curve image;
Through type (1) calculates the centre of sphere line deviation of minute surface again:
In formula (1), α is the centre of sphere line deviate of tested minute surface, and S is the deferent diameter that the cross curve that obtains on photodetector 5 marks, β=β
1β
2, β
2for the vertical axle magnification of tested minute surface, β
1for the vertical axle magnification of optical measuring head 11;
Or through type (2) calculates the centre of sphere angular displacement value of minute surface:
In formula (2), χ is the centre of sphere angular displacement value of tested minute surface, and R is the radius-of-curvature of tested minute surface.S is identical with upper formula definition with β.
Design philosophy of the present invention: in the time that the image of spherical center of tested minute surface is nearer apart from optical measuring head 11, optical alignment lens group 3 is adjusted to the position that produces directional light, switch the optical focus lens group 4 of different focal, regulate again the position of straight-line displacement mechanism 9, cross curve target is focused on to the position of the image of spherical center of tested minute surface; In the time that the image of spherical center of tested minute surface is far away apart from optical measuring head 11, remove optical focus lens group 4, only regulate the position of optical alignment lens group 3, cross curve target is focused on to the position of the image of spherical center of tested minute surface; Utilize this two kinds of working methods, can realize the centre of sphere deviation of various radius-of-curvature optical mirror planes and measure, meanwhile, can reach higher measuring accuracy.
The course of work of optical lens centre of sphere deviation measurement device of the present invention:
The first step, powers on to device;
Second step, tested optical lens 12 is placed on to the centre of mechanical leveling platform 7, observe the cross curve image gathering on main control computer 10, regulate straight-line displacement mechanism 9, make the clear picture of cross curve, regulate gain or time shutter of photodetector 5, the brightness that makes cross curve image is in can apparent scope;
The 3rd step, starts precision rotation platform 8, and the center of circle of cross curve image moves in a circle, and regulates mechanical leveling platform 7, and the center of circle that cross curve image is moved in a circle is positioned at the central area of photodetector 5 imaging areas;
Doing is like this optical axis of the optical axis in order to make tested optical lens 12 near optical measuring head 11, and while ensureing that tested optical lens 12 moves in a circle with precision rotation platform 8, deferent is within the scope of detector target surface;
The 4th step, stop precision rotation platform 8, by the centre of sphere deviation Survey Software of the radius-of-curvature of each minute surface of tested optical lens 12, minute surface interval and eyeglass refractive index input main control computer 10, calculate centre of sphere position and the vertical axle magnification β of all thereon mirror images image of spherical center afterwards relatively of each minute surface
2;
The 5th step, position according to the tested minute surface of four-step calculation with respect to the image of spherical center after all mirror images on it, in the time that the image of spherical center of tested minute surface is nearer apart from optical measuring head 11, optical alignment lens group 3 is adjusted to the position that produces directional light, the optical focus lens group 4 of proper focal length is installed, regulate the position of straight-line displacement mechanism 9, until cross curve blur-free imaging, make cross curve target focus on the position of the image of spherical center of the tested minute surface of four-step calculation, by the centre of sphere deviation Survey Software of the focal length input main control computer 10 of optical focus lens group 4, main control computer 10 calculates the enlargement ratio β 1 of optical measuring head 11 according to the focal length of optical focus lens group 4, in the time that the image of spherical center of tested minute surface is far away apart from optical measuring head 11, pull down optical focus lens group 4, regulate the position of optical alignment lens group 3, until cross curve blur-free imaging, make cross curve target focus on the position of the image of spherical center of the tested minute surface of four-step calculation, the position of the optical alignment lens group 3 that main control computer 10 transmits according to linear displacement transducer 6, the enlargement ratio β of calculating optical measuring head 11
1,
The 6th step, start precision rotation platform 8, precision rotation platform 8 drives tested optical lens 12 to circle, can obtain by photodetector 5 deferent that cross curve marks, calculate the diameter S of deferent by main control computer 10, the centre of sphere line of this minute surface is formula (1) calculating for deviate:
In formula (1), α is the centre of sphere line deviate of tested minute surface, and S is the deferent diameter that the cross curve that obtains on photodetector 5 marks, β=β
1β
2, β is the vertical axle magnification of optical system, β
1for the vertical axle magnification of optical measuring head 12, β
2for the vertical axle magnification of tested minute surface;
The centre of sphere angular displacement of this minute surface is formula (2) calculating for value:
In formula (2), χ is the centre of sphere angular displacement value of tested minute surface, and R is the radius-of-curvature of tested minute surface, and S and β are identical with formula (1).
In measuring process, in measuring process, the consistance of axis of reference, once after mechanical leveling platform 7 regulated, can not adjust again.
In the time that tested optical lens comprises multiple eyeglass, repeat the 5th step and the 6th step, measure successively from top to bottom the centre of sphere deviation of each minute surface, can obtain the offset of each minute surface, the personnel that debug are according to the minute surface centre of sphere deviate measuring, adjust the position of each eyeglass, until minute surface centre of sphere deviation reaches tolerance.
Embodiment
The present embodiment light source 101 is selected the high-brightness LED of power 3W; The line width of cross curve target 103 is 25 μ m, cross curve printing opacity, and other parts are light tight.Spectroscope 2, is formed by two right-angle prism gummeds, plates spectro-film on cemented surface, and within the scope of 400～700nm, the Transflective ratio of spectroscope 2 is 50%:50%, and the length of side of prism is 30mm.Optical alignment lens group 3, is made up of two cemented doublets, and focal length is 270mm, and its object plane is the surface of cross curve target 103, and its focusing stroke is 61mm, cross curve focus point scope is-∞～1200mm and+1200mm～+ ∞.Optical focus lens group 4, is a cemented doublet, in the time measuring optical mirror slip eccentric of different curvature radius, needs switchable optics amasthenic lens group 4, and its focal length is respectively :-1200mm ,-800mm ,-400mm, 400mm, 800mm, 1200mm.Photodetector 5, adopts highly sensitive area array CCD, produces black white image, and resolution is 1392 × 1040, can regulate gain and time shutter.Linear displacement transducer 6, adopts high-precision grating scale, and measuring accuracy is 5 μ m, range 100mm.Machinery leveling platform 7, can carry out position and angular adjustment, the be ± 5mm of position adjustment range of X and Y both direction, and position adjustments precision is ± 1 μ m, and angle of inclination range of adjustment is ± 1.5 °, and angular adjustment precision is ± 1 ".Precision rotation platform 8, adopts high-precision air supporting universal stage, and mesa diameter is 300mm, rotate a circle, its axially and radial beat eccentricity be less than 0.2 μ m.Straight-line displacement mechanism 9, adopts upright guide rail, stroke 600mm, and positioning precision is 0.1mm.
The course of work of the embodiment of the present invention: for example, the radius-of-curvature of tested eyeglass upper and lower surface is respectively 360mm and 800mm, and lens thickness is 6mm, and material is K9, and operation steps is as follows:
The first step, powers on to device;
Second step, tested optical lens 12 is placed on to the centre of mechanical leveling platform 7, regulate the upper-lower position of straight-line displacement mechanism 9, obtain the picture rich in detail of cross curve, observe the brightness of the cross curve image on main control computer 10 screens, the gain or the time shutter that regulate photodetector 5, make the gray-scale value of cross curve in image between 150～220;
The 3rd step, starts precision rotation platform 8, regulates mechanical leveling platform 7, the cross curve that the uppermost optical mirror plane of tested optical lens 12 is reflected back, and the center of circle of the deferent marking, is positioned at the central area of photodetector 5;
The 4th step, stop precision rotation platform 8, by the centre of sphere deviation Survey Software of the radius-of-curvature of each minute surface of tested optical lens 12, minute surface interval and eyeglass refractive index input main control computer 10, calculate centre of sphere position and the vertical axle magnification β of all thereon mirror images image of spherical center afterwards relatively of each minute surface
2; In this example, the centre of sphere of upper surface is positioned at 360mm place under upper surface summit, and the axle magnification that hangs down is 1; The centre of sphere of lower surface, with respect to the centre of sphere after upper surface imaging, is positioned at 2240.49mm place under upper surface summit, and the axle magnification that hangs down is-4.216;
The 5th step, first measures the minute surface that radius-of-curvature is 360mm.The optical focus lens group 4 that is 400mm by focal length is arranged on optical measuring head 11, optical alignment lens group 3 is adjusted to the position that produces directional light, regulate the height of straight-line displacement mechanism 9, until cross curve blur-free imaging, cross curve target focuses on the position of the image of spherical center of tested minute surface, by the centre of sphere deviation Survey Software of the focal length input main control computer 10 of optical focus lens group 4, the enlargement ratio β of calculating optical measuring head 11
2;
The 6th step, start precision rotation platform 8, drive tested optical lens 12 to circle, can obtain by photodetector 5 deferent that cross curve marks, centre of sphere deviation Survey Software in main control computer 10, by graphical analysis, can obtain the diameter S of the deferent marking at cross curve center, utilize formula (1) can calculate the line offset α of this minute surface, utilize formula (2) can calculate the angle offset χ of this minute surface.
The 7th step, the minute surface that measurement radius-of-curvature is 800mm.Take off optical focus lens group 4, regulate the position of optical alignment lens group 3, cross curve is focused on to 2240.49mm place under upper surface summit, and the centre of sphere deviation Survey Software of main control computer 10 is according to the position of optical alignment lens group 3, the enlargement ratio β of calculating optical measuring head 11
2;
Repeat the 6th step, obtain line offset and the angle offset of this minute surface.
Obviously, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that the those of ordinary skill for described technical field, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (6)
1. optical lens centre of sphere deviation measurement device, it is characterized in that, comprise: optical illumination module (1), spectroscope (2), optical alignment lens group (3), optical focus lens group (4), photodetector (5), linear displacement transducer (6), mechanical leveling platform (7), precision rotation platform (8), straight-line displacement mechanism (9) and main control computer (10)
Described optical illumination module (1), spectroscope (2), optical alignment lens group (3), optical focus lens group (4), photodetector (5) and linear displacement transducer (6) form optical measuring head (11);
Described optical focus lens group (4) is detachable, in the time that optical focus lens group (4) is pulled down, the cross curve target light beam that optical illumination module (1) produces focuses on the position of the image of spherical center of tested minute surface successively through spectroscope (2) and optical alignment lens group (3), cross curve target light beam, after tested mirror-reflection, focuses on the target surface of photodetector (5) successively through optical alignment lens group (3) and spectroscope (2); In the time that optical focus lens group (4) is installed, the cross curve target light beam that optical illumination module (1) produces focuses on the position of the image of spherical center of tested minute surface successively through spectroscope (2), optical alignment lens group (3) and optical focus lens group (4), cross curve target light beam, after tested mirror-reflection, focuses on the target surface of photodetector (5) successively through optical focus lens group (4), optical alignment lens group (3) and spectroscope (2);
The light signal of the cross curve target light beam reflecting is converted to electric signal by described photodetector (5), forms cross curve image, and by cross curve image transmission to main control computer (10);
Described linear displacement transducer (6) is for measuring the diverse location of optical alignment lens group (3), and sends this positional information to main control computer (10);
Described mechanical leveling platform (7) is connected on precision rotation platform (8), for regulating the position relationship between the optical axis of tested optical lens (10) and the rotation of precision rotation platform (8);
Described precision rotation platform (8) drives the axis rotation of tested optical lens (12) around precision rotation platform (8);
Described straight-line displacement mechanism (9) drives optical measuring head (11) to make the rectilinear motion of vertical direction, and measures the position of optical measuring head (11), and sends this positional information to main control computer (10);
Described main control computer (10) is for calculating centre of sphere deviation.
2. optical lens centre of sphere deviation measurement device according to claim 1, is characterized in that, described optical illumination module (1) comprises light source (101), frosted glass (102) and cross curve target (103).
3. optical lens centre of sphere deviation measurement device according to claim 2, it is characterized in that, described spectroscope (2) is right angle cemented prism, the target surface of photodetector (5) is positioned at the upside of spectroscope (2), cross curve target (103) is positioned at the right side of spectroscope (2), and the target surface of photodetector (5) equals the distance of cross curve target (103) to the right surface of spectroscope (2) to the distance of the upper surface of spectroscope (2).
4. optical lens centre of sphere deviation measurement device according to claim 1, is characterized in that, the position of described optical alignment lens group (3) can regulate.
5. optical lens centre of sphere deviation measurement device according to claim 1, is characterized in that, described optical focus lens group (4) can be switched the optical lens of different focal.
6. optical lens centre of sphere deviation measurement device according to claim 1, is characterized in that, the process that described main control computer (10) calculates centre of sphere deviation is:
Step 1, centre of sphere deviation Survey Software, according to radius-of-curvature, minute surface interval and the eyeglass refractive index of each minute surface of the tested camera lens (12) of input, are calculated centre of sphere position and the vertical axle magnification β of all thereon mirror images image of spherical center afterwards relatively of each minute surface of tested camera lens (12)
2;
Step 2, centre of sphere deviation Survey Software are according to the tested minute surface the calculating position of its upper all mirror images image of spherical center afterwards relatively, provide the positional information of optical alignment lens group (3), or provide the focus information of optical focus lens group (4) and regulate the positional information of straight-line displacement mechanism (9);
The vertical axle magnification β of the positional information calculation optical measuring head (11) of the optical collimation lens group (3) that step 3, centre of sphere deviation Survey Software transmit according to linear displacement transducer (6)
1, or according to the vertical axle magnification β of the focal length calculating optical measuring head (11) of the optical focus lens group (4) using
1;
Step 4, centre of sphere deviation Survey Software are processed by the cross curve image information to obtaining, and calculate the diameter S of cross curve image deferent;
Step 5, centre of sphere deviation Survey Software be the centre of sphere line deviation α of through type (1) calculating minute surface again:
In formula (1), β=β
1β
2;
Or through type (2) calculates the centre of sphere angular displacement value χ of minute surface:
In formula (2), R is the radius-of-curvature of tested minute surface, β=β
1β
2.
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