CN103512730A - Device for measuring back vertex power of lens - Google Patents
Device for measuring back vertex power of lens Download PDFInfo
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- CN103512730A CN103512730A CN201310464670.4A CN201310464670A CN103512730A CN 103512730 A CN103512730 A CN 103512730A CN 201310464670 A CN201310464670 A CN 201310464670A CN 103512730 A CN103512730 A CN 103512730A
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Abstract
The invention provides a device for measuring back vertex power of a lens. The device comprises a light source, a target reticle, a collimator objective and a telescope. An afocal target is generated by means of the collimator objective through the target reticle illuminated by the light source, the to-be-tested lens is arranged between the collimator objective and the telescope, an image space reticle is adjusted so that a clear image of the target reticle is obtained in the telescope, and the back vertex power phi is obtained in a calculating mode through a formula. According to the method, what is measured is the back vertex power in principle, approximation does not exist, the target is arranged to be afocal in the method that the collimator objective is additionally arranged, an instrument measurement device is shortened, integration can be achieved, and accordingly an instrument occupies little space, daily maintenance, detection and calibration are facilitated. Due to the fact that the focal length of the telescope is long enough, the measurement accuracy is greatly improved. The vertex power and the moving distance of the image space reticle are in a linear relationship, and accordingly the moving distance is shorter when the same measurement accuracy of the measurement device needs to be reached. The length measurement can be achieved through a mechanical rule, and cost of the instrument is reduced.
Description
Technical field
The present invention relates to a kind of measurement mechanism of optical mirror slip, measuring method and the device of the little rear vertex lens power of especially a kind of optical mirror slip.
Background technology
The inverse of the eyeglass paraxial back vertex focal length that rear vertex lens power Back vertex power Shi Yi meter Wei unit records.Unit is the inverse (m-1) of rice.After eyeglass, summit is called paraxial back vertex focal length to the distance of paraxial back focus, as shown in Figure 1, and F-focus in object space wherein; F '-rear focus; H-object space principal point; H '-image space principal point; F-object space focal length; F '-image space focal length; Lf-paraxial front vertex focal distance; l
f'-paraxial back vertex focal length.An eyeglass contains former and later two vertex lens powers.According to ophthalmic optics agreement, the vertex lens power of eyeglass all refers to rear vertex lens power.
Sunglasses, protective glasses and goggles belong to little vertex lens power eyeglass, and this eyeglass is because vertex lens power value is little, and measuring accuracy requires high and needs special vertex lens power measurement mechanism to measure.Conventionally this special measurement device measurement range is ± 0.25m
-1, measuring accuracy reaches 0.01m conventionally
-1.
The detection method of this class eyeglass has automatic lensometer method (4 unthreaded hole methods), and this method is because its principle is based on Magnification method, irrelevant with lens image quality, is not admitted in the world always.
Another method is the sunglasses detection method of current European Union standard recommendation, and the sunglasses detection method that sunglasses iso standard is recommended is the measuring method of current comprehensive optometry instrument.Its principle is: target graticule is placed on 4.6 meter position, tested eyeglass is placed in to the optional position between target graticule and object lens, and the distance of measuring telescope Focal Point Shift, then according to the rear vertex lens power D of formula calculating eyeglass.Described sunglasses iso standard checkout equipment used as shown in Figure 2, comprising bulb 21, canonical measure plate 22, sample 23, telescope 24, focus control 25 is successively set in light path, displacement transducer 26 is for the displacement of measuring telescope focus, zero-bit system 28 is electrically connected to displacement transducer 26 and digital voltmeter 29 respectively, and calibration system 27 is for calibration bits displacement sensor 26 and zero-bit system 28, and the data of surveying are finally inputted computing machine 30 and obtained measurement result.
When eyeglass is thin lens, tested rear vertex lens power can be approximate by the focal power of eyeglass.Tested focal power with the pass of the distance Z moving is: tested focal power
wherein b is: object distance is 4600mm telephotolens focal length corresponding image distance while being f; Z is the distance of telescope Focal Point Shift.There is following shortcoming in the method:
1) in principle, the method is a kind of approximate.Said system measurement is actually the focal power of sunglasses eyeglass, rather than rear vertex lens power.Approximate for the actual rear vertex lens power that will measure of human eye by the focal power measuring.
2) principle of this measurement is that target graticule is placed on 4.6 meter position, makes apparatus measures device too huge, takes up room excessive.Meanwhile, instrument cannot be realized integrated, and instrument is not integrated is unfavorable for the calibration (to) of instrument itself, detects (instrument externally detects Sunglasses lenses sun clips) and daily servicing (target location changes the error of indication that will image instrument).
3) distance that the focal power in this principle scheme and image space graticule move is not linear relationship.The calculating of vertex lens power after this not only requires measurement mechanism must adopt electronic surveying equipment to realize.The distance that also will take into account the measuring accuracy of instrument and image space graticule is moved is elongated.Measuring accuracy can not guarantee.And measuring accuracy corresponding to movable length that linear relationship is same graticule is identical, nonlinear relationship, the measuring accuracy corresponding to movable length of identical graticule is not identical in different positions, in order to guarantee precision, need closeer non-linear section, so will waste and dredge the stroke of a section.
Summary of the invention
The object of the invention is to for above-mentioned existing problems, propose vertex lens power device after a kind of Accurate Measurement eyeglass, its device compared with prior art dwindles greatly, and reduces and measure cost.
The measurement mechanism of vertex lens power after a kind of eyeglass, comprise light source, target graticule, telescope, also comprise collimator objective, light source wherein, target graticule, telescope is successively set in light path, between target graticule and telescope, collimator objective is set, target graticule is imaged in to infinity, and tested eyeglass is placed between collimator objective and telescopical object lens, and telescope image space graticule is adjustable.
A measurement mechanism for vertex lens power after eyeglass, wherein calculates the relational expression of rear vertex lens power Φ and z according to formula:
Wherein, the displacement of z telescope image space graticule; F ' is the focal length of telephotolens; X is the departing from of summit relative reference face (front focal plane of telephotolens) after eyeglass.
A measurement mechanism for vertex lens power after eyeglass, wherein telephotolens focal range is 100-1000mm, preferably 150-400mm.
A measurement mechanism for vertex lens power after eyeglass, wherein target graticule is positioned on the focal plane of collimator objective.
A measurement mechanism for vertex lens power after eyeglass, wherein collimator objective can adopt simple lens, two cemented objective or other complicated lens.
A measurement mechanism for vertex lens power after eyeglass, wherein tested eyeglass is placed on the front focal plane of telephotolens.
A measurement mechanism for vertex lens power after eyeglass, wherein target graticule is removable, with this, regulates telescopical picture.
A measurement mechanism for vertex lens power after eyeglass, wherein its computing formula is
wherein z is the displacement of target graticule; F ' is the focal length of collimator objective; X is the departing from of summit relative reference face (back focal plane of collimator objective) after eyeglass.
A measurement mechanism for vertex lens power after eyeglass, wherein telescopical image space receiver can also be CCD.
A measurement mechanism for vertex lens power after eyeglass, wherein light source adopts the lighting system of LED illumination, preferred green LED illumination or bulb, condenser and optical filter.
A measurement mechanism for vertex lens power after eyeglass, wherein adopts precision resistor, grating equal length sensor measurement graticule displacement.
After eyeglass, a measurement mechanism for vertex lens power, comprises light source, target graticule, telescope, also comprise collimator objective, light source wherein, target graticule, telescope is successively set in light path, between target graticule and telescope, collimator objective is set, so that target graticule is imaged in to infinity, a catoptron is at least set between collimator objective and telescope ocular, for reducing the size of measuring system, tested eyeglass is placed between collimator objective and telephotolens.
A measurement mechanism for vertex lens power after eyeglass, wherein, after collimator objective, is provided with object space catoptron before tested eyeglass, the certain angle of the light of autocollimation object lens reflection in the future.
A measurement mechanism for vertex lens power after eyeglass is wherein provided with image space catoptron between telephotolens and image space graticule, and by the light reflection certain angle from telephotolens, telescope image space graticule is adjustable.
A measurement mechanism for vertex lens power after eyeglass, wherein calculates the relational expression of rear vertex lens power Φ and z according to formula:
Wherein, the displacement of z telescope image space graticule; F ' is the focal length of telephotolens; X is the departing from of summit relative reference face (front focal plane of telephotolens) after eyeglass.
A measurement mechanism for vertex lens power after eyeglass, wherein telephotolens focal range is 100-1000mm, preferably 150-400mm.
A measurement mechanism for vertex lens power after eyeglass, wherein target graticule is positioned on the focal plane of collimator objective.
A measurement mechanism for vertex lens power after eyeglass, wherein collimator objective can adopt simple lens, two cemented objective or other complicated lens.
A measurement mechanism for vertex lens power after eyeglass, wherein tested eyeglass is placed on the front focal plane of telephotolens.
A measurement mechanism for vertex lens power after eyeglass, wherein target graticule is removable, with this, regulates telescopical picture.
A measurement mechanism for vertex lens power after eyeglass, wherein its computing formula is
wherein z is the displacement of target graticule; F ' is the focal length of collimator objective; X is the departing from of summit relative reference face (back focal plane of collimator objective) after eyeglass.
A measurement mechanism for vertex lens power after eyeglass, wherein telescopical image space receiver can also be CCD.
A measurement mechanism for vertex lens power after eyeglass, wherein light source adopts the lighting system of LED illumination, preferred green LED illumination or bulb, condenser and optical filter.
A measurement mechanism for vertex lens power after eyeglass, wherein adopts precision resistor, grating equal length sensor measurement graticule displacement.
A measurement mechanism for vertex lens power after eyeglass, wherein the prism degree of eyeglass can calculate according to formula:
Wherein a is the deviation distance at the relative image space graticule of target cross division line center, f
1' be telephotolens focal length.
After a kind of eyeglass of the present invention, the measuring method of vertex lens power and device advantage are:
1) in principle the method measurement be after vertex lens power, in full accord about ametropic definition in this and spectacles industry and ophthalmic optics, do not exist in theory approximate.
2) this measuring method is placed in infinity by increasing the method for collimator objective by target, and apparatus measures device is dwindled, and can realize integratedly, and it is less that this not only makes instrument take up room, and be conducive to daily maintenance, detects and calibration.And due to the focal length long enough of telephotolens, measuring accuracy is increased substantially.
After existing eyeglass, the measuring method of vertex lens power and measurement device is ± the common eyeglass of 2.5D, and the present invention measures is ± and the eyeglass of little vertex lens power below 0.5D, so precision is high.
3) distance that the vertex lens power in this principle scheme and image space graticule move is linear relationship.Make the displacement of the measuring accuracy needs that measurement mechanism is identical shorter.Meanwhile, due to linear relationship, linear measure longimetry part can adopt machinery to carve chi just can realize measurement, the cost that this will lowering apparatus.Also can adopt electronic sensor to realize measurement the final measurement that realizes rear vertex lens power of Length Quantity.The method has better applicability.
4) on vertex lens power is measured, also can adopt precision resistor, grating equal length sensor measurement graticule displacement, after final realization, the measurement of vertex lens power, has avoided human eye according to the triviality of vernier reading, improves accuracy and measuring accuracy.
5) by increasing by one group of catoptron reflection light path of turning back, can improve the reasonable structure of optical system, make the size decreases of device, thereby make people's operating instrument of being more convenient for.
6) pick-up unit adopts CCD to receive optical imagery on receiving, and the method makes surveying instrument no longer as long-term use of traditional visual optical system, cause eye fatigue.And can realize according to the shown cursor position of CCD the measurement of prism degree.
7) can receive by eyepiece, human eye judgement sharpness, human eye is realized focusing, reduces costs.
8) image that also can utilize CCD to receive, adopts the judgement of computer realization sharpness, and then realizes precision and focus.Make measurement result more objective, more accurate.
9) in post mirror axle position, measure, adopt angular encoder 23, realize the measurement of axle position and avoided human eye according to the triviality of vernier reading, improve accuracy.Also can adopt mechanical scale to realize post mirror axle position measures.
Accompanying drawing explanation
Fig. 1 is eyeglass back focal distance schematic diagram;
Fig. 2 is vertex lens power detection method schematic diagram after international standard sunglasses;
Fig. 3 is the schematic diagram of the measurement mechanism of vertex lens power after a kind of eyeglass of the present invention;
Fig. 4 is the preferred schematic diagram of the measurement mechanism of vertex lens power after a kind of eyeglass of the present invention.
Embodiment
If Fig. 3 is the schematic diagram of the measurement mechanism of vertex lens power after a kind of eyeglass of the present invention, the measuring system of vertex lens power after eyeglass of the present invention, comprise light source (not shown), target graticule 1, telescope 7, telescope 7 is comprised of telephotolens 3, image space graticule 4 and eyepiece 5, and telephotolens focal range is 100-1000mm, preferred 150-400mm, the more long measurement that more can realize little vertex lens power eyeglass of telephotolens focal length.Measuring system also comprises collimator objective 2, wherein be arranged on the light source at target graticule 1 place, target graticule 1, telescope 7 is successively set in light path, between target graticule 1 and telescope 7, collimator objective 2 is set, target graticule 1 is imaged in to infinity, and target graticule 1 is positioned on the focal plane of collimator objective 2.Tested eyeglass 6 is placed between collimator objective 2 and the object lens 3 of telescope 7, and telescope 7 image space graticules 4 are adjustable.According to formula, calculate the relational expression of rear vertex lens power Φ and z:
Wherein, the displacement of z telescope image space graticule; F ' is the focal length of telephotolens; X is the front focal plane of summit relative reference face 8(telephotolens after eyeglass) depart from.
When x=0, have
Be that the rear vertex lens power of tested eyeglass and the axial displacement z of image space graticule are directly proportional.According to the z recording, can obtain the rear vertex lens power of tested eye eyeglass.
After eyeglass as shown in Figure 3, in the measuring system of vertex lens power, collimator objective 2 can adopt simple lens, two cemented objective or other complicated lens.Tested eyeglass 6 is preferably placed on the front focal plane of telephotolens, also can be placed on the arbitrary position between telephotolens and collimator objective, now can ignore the slight error that bring to measurement above-mentioned position, also can be by this error of electronic display unit correction.
The lighting system of light source employing LED illumination, preferred green LED illumination or bulb, condenser and optical filter in the measuring system of vertex lens power after eyeglass of the present invention.
After eyeglass of the present invention, the image space receiver of the measuring system Instrumental of vertex lens power can adopt the imaging of image space graticule and eyepiece receiving system.Also can adopt CCD to receive image.The precision focusing of imaging receiver can adopt manual adjustments position, and human eye judgement sharpness realizes, and also can adopt electronic algorithms to realize the image that CCD is gathered and do sharpness evaluation, thereby realize automatic focusing.
After eyeglass of the present invention, in the measuring system of vertex lens power, position measurement can be carved chi with machinery, also can be realized the measurement of position and finally be conversed rear vertex lens power measurement result by other length measurement sensors.
The little vertex lens power eyeglass of the present invention post mirror degree is measured the strip pattern realization measurement that can pass through target graticule (or image space graticule), also can pass through the orthogonal cross spider patterns such as cross curve of target graticule (or image space graticule) and realize.When actual measurement: rotation sample or target graticule or image space graticule, gauger observes by telescope, makes aliging of the principal meridian of sample and strip pattern on target graticule.During measurement, choice criteria is measured the group leader's bar paten on plate, focusing telescope, until can observe clearly selected strip specimen page, now telescopical focusing scale is designated as S1.Then, gauger selects other one group of pattern perpendicular with measuring S1 again, focusing telescope again, until see clearly the picture of this pattern, now telescopical focusing scale is designated as S2.
Calculate according to the following formula diopter of correction:
In formula:
S---diopter of correction;
S1---measurement result for the first time
S2---measurement result for the second time
Calculate according to the following formula astigmatism:
C---astigmatism;
S1---measurement result for the first time
S2---measurement result for the second time
Measuring system of the present invention can also be measured the prism degree of eyeglass, and prism degree can adopt target graticule (or image space graticule) annulus to realize prism degree and measure, and also can adopt image space CCD to realize and measure.Prism degree wherein
Wherein a is the deviation distance at the relative image space graticule of target cross division line center, and f1' is telephotolens focal length.
The measuring system of vertex lens power after eyeglass of the present invention, wherein target graticule is removable, with this, regulates the picture of telescope 7.Its computing formula is
wherein z is the displacement of target graticule; F ' is the focal length of collimator objective; X is the departing from of summit relative reference face (back focal plane of collimator objective) after eyeglass.
The measuring method of vertex lens power after eyeglass of the present invention, as Fig. 3, comprises light source, target graticule 1, and collimator objective 2, telescope 7, also comprises the steps:
1) target graticule 1 use collimator objective 2 is produced to infinity target, while not putting tested eyeglass 6 in light path, target graticule 1, is positioned on the focal plane of collimator objective 2, can in the telescopic system being comprised of telephotolens 3 and eyepiece 5, obtain the picture of mark clearly;
2) tested eyeglass 6 is placed between collimator objective 2 and telephotolens 3;
3) regulate image space graticule 4, image space graticule 4 need move a segment distance z along optical axis, could again in telescopic system, obtain the picture of the plate of target differentiation clearly;
4) according to formula, calculate the relational expression of rear vertex lens power Φ and z:
Wherein, the displacement of z telescope image space graticule; F ' is the focal length of telephotolens; X is the departing from of summit relative reference face (front focal plane of telephotolens) after eyeglass.
When x=0, have
Be that the rear vertex lens power of tested eyeglass and the axial displacement z of image space graticule are directly proportional.According to the z recording, can obtain the rear vertex lens power of tested eye eyeglass.
The present invention also can pass through moving target graticule 1, obtains the picture of target graticule 4 clearly in telescope 7, and its computing formula is still
wherein z is the displacement of target graticule; F ' is the focal length of collimator objective; X is the back focal plane of the rear summit of eyeglass 6 relative reference face 8(collimator objective) depart from.
Advantage of the present invention is that this method is measured in principle be after vertex lens power, in full accord about ametropic definition in this and spectacles industry and ophthalmic optics, do not exist in theory approximate, but data that after accurately measuring, vertex lens power obtains.This measuring method is placed in infinity by increasing the method for collimator objective by target, the size of at least 4 meter 6, the instrument that uses than international standard is dwindled greatly, can realize integratedly, it is less that this not only makes instrument take up room, and be conducive to daily maintenance, detect and calibration.The distance that vertex lens power in this principle scheme and image space graticule move is linear relationship.Make the displacement of the measuring accuracy needs that measurement mechanism is identical shorter.Meanwhile, due to linear relationship, linear measure longimetry part can adopt machinery to carve chi just can realize measurement, the cost that this will lowering apparatus.Also can adopt electronic sensor to realize measurement the final measurement that realizes rear vertex lens power of Length Quantity.The method has better applicability.
Fig. 4 is the measurement mechanism preferred embodiment of vertex lens power after a kind of eyeglass of the present invention, wherein with Fig. 3 in difference be that two catoptrons are set in imaging optical path, thereby reduced the size of whole measuring system, as shown in Figure 4, the measuring system of vertex lens power after eyeglass, comprise light source 13, be arranged on the target graticule (not shown) at light source 13 places, telescope, also comprise collimator objective 2, wherein light source 13, target graticule, telescope is successively set in light path, collimator objective 2 is set between target graticule and telescope, so that target graticule is imaged in to infinity, tested eyeglass 6 is placed between collimator objective 2 and telephotolens 3, an object space catoptron 14 is set between collimator objective 2 and telescope ocular 5, for reducing the size of measuring system, in the present embodiment, be provided with two catoptrons, after collimator objective 2, before tested eyeglass 6, be provided with object space catoptron 14, the certain angle of the light of autocollimation object lens 2 reflection in the future, be preferably 45 °, between telephotolens 3 and image space graticule 4, be provided with image space catoptron 9, by the light reflection certain angle from telephotolens, make whole measuring system present meal Z-shaped, like this, the size of the measuring system greatly reducing, realize integrated, it is less that this not only makes instrument take up room, and be conducive to daily maintenance, detect and calibration.Telescope image space graticule 4 is adjustable.The present embodiment telescope image space graticule 4 is adjustable.According to formula, calculate the relational expression of rear vertex lens power Φ and z:
Wherein, the displacement of z telescope image space graticule; F ' is the focal length of telephotolens; X is the departing from of summit relative reference face (front focal plane of telephotolens) after eyeglass.
The present embodiment selected objective target graticule 1 is positioned on the focal plane of collimator objective 2, and collimator objective 2 can adopt simple lens, two cemented objective or other complicated lens.Telephotolens 3 focal ranges are 100-1000mm, preferably 150-400mm.Tested eyeglass 6 is placed on the front focal plane of telephotolens 3.The image space receiver of telescope 7 can also be CCD.Light source 13 adopts the lighting system of LED illumination, preferred green LED illumination or bulb, condenser and optical filter.Adopt precision resistor, grating equal length sensor measurement graticule displacement.
Claims (21)
1. the measurement mechanism of vertex lens power after an eyeglass, comprise light source, target graticule, telescope, also comprise collimator objective, it is characterized in that light source, target graticule, telescope is successively set in light path, between target graticule and telescope, collimator objective is set, target graticule is imaged in to infinity, and tested eyeglass is placed between collimator objective and telescopical object lens, and telescope image space graticule is adjustable.
2. the measuring system of vertex lens power after eyeglass according to claim 1, is characterized in that calculating according to formula the relational expression of rear vertex lens power Φ and z:
Wherein, the displacement of z telescope image space graticule; F ' is the focal length of telephotolens; X is the departing from of summit relative reference face (front focal plane of telephotolens) after eyeglass.
3. the measuring system of vertex lens power after eyeglass according to claim 2, is characterized in that telephotolens focal range is 100-1000mm, preferably 150-400mm.
4. according to the measuring system of vertex lens power after the eyeglass described in claim 1 or 3, it is characterized in that target graticule is positioned on the focal plane of collimator objective.
5. the measuring system of vertex lens power after eyeglass according to claim 4, is characterized in that collimator objective can adopt simple lens, two cemented objective or other complicated lens.
6. the measuring system of vertex lens power after eyeglass according to claim 1 or 5, is characterized in that tested eyeglass is placed on the front focal plane of telephotolens.
7. the measuring system of vertex lens power after eyeglass according to claim 6, is characterized in that target graticule is removable, regulates telescopical picture with this.
8. according to the measuring system of vertex lens power after the eyeglass described in claim 1 or 7, it is characterized in that its computing formula is
Wherein z is the displacement of target graticule; F ' is the focal length of collimator objective; X is the departing from of summit relative reference face (back focal plane of collimator objective) after eyeglass.
9. the measuring system of vertex lens power after eyeglass according to claim 8, is characterized in that telescopical image space receiver can also be CCD.
10. the measuring system of vertex lens power after eyeglass according to claim 9, is characterized in that light source adopts the lighting system of LED illumination, preferred green LED illumination or bulb, condenser and optical filter.
The measuring system of vertex lens power after 11. eyeglasses according to claim 10, is characterized in that adopting precision resistor, grating equal length sensor measurement graticule displacement.
After 12. 1 kinds of eyeglasses, the measurement mechanism of vertex lens power, comprises light source, target graticule, telescope, also comprise collimator objective, it is characterized in that light source, target graticule, telescope is successively set in light path, between target graticule and telescope, collimator objective is set, so that target graticule is imaged in to infinity, a catoptron is at least set between collimator objective and telescope ocular, for reducing the size of measuring system, tested eyeglass is placed between collimator objective and telephotolens.
After 13. eyeglasses according to claim 12, the measuring system of vertex lens power, is characterized in that after collimator objective, is provided with object space catoptron before tested eyeglass, the certain angle of the light of autocollimation object lens reflection in the future.
14. according to the measuring system of vertex lens power after the eyeglass described in claim 12 or 13, it is characterized in that being provided with image space catoptron between telephotolens and image space graticule, and by the light reflection certain angle from telephotolens, telescope image space graticule is adjustable.
The measuring system of vertex lens power after 15. eyeglasses according to claim 14, is characterized in that calculating according to formula the relational expression of rear vertex lens power Φ and z:
Wherein, the displacement of z telescope image space graticule; F ' is the focal length of telephotolens; X is the departing from of summit relative reference face (front focal plane of telephotolens) after eyeglass.
16. according to the measuring system of vertex lens power after the eyeglass described in claim 12 or 15, it is characterized in that telephotolens focal range is 100-1000mm, preferably 150-400mm.
The measuring system of vertex lens power after 17. eyeglasses according to claim 16, is characterized in that target graticule is positioned on the focal plane of collimator objective, and collimator objective can adopt simple lens, two cemented objective or other complicated lens.
18. according to the measurement mechanism of vertex lens power after a kind of eyeglass described in claim 12 or 17, it is characterized in that tested eyeglass is placed on the front focal plane of telephotolens.
The measuring system of vertex lens power after 19. eyeglasses according to claim 18, is characterized in that target graticule is removable, with this, regulates telescopical picture, and its computing formula is
wherein z is the displacement of target graticule; F ' is the focal length of collimator objective; X is the departing from of summit relative reference face after eyeglass.
20. according to the measuring system of vertex lens power after the eyeglass described in claim 12 or 19, it is characterized in that telescopical image space receiver can also be CCD, light source adopts the lighting system of LED illumination, preferred green LED illumination or bulb, condenser and optical filter, adopts precision resistor, grating equal length sensor measurement graticule displacement.
21. according to the measurement mechanism of vertex lens power after a kind of eyeglass described in claim 1 or 12 or 20, it is characterized in that the prism degree of eyeglass is:
Wherein a is the deviation distance at the relative image space graticule of target cross division line center, f
1' be telephotolens focal length.
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| CN108663197A (en) * | 2018-07-02 | 2018-10-16 | 北京全欧光学检测仪器有限公司 | A kind of small-sized lens detecting device and its detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663197A (en) * | 2018-07-02 | 2018-10-16 | 北京全欧光学检测仪器有限公司 | A kind of small-sized lens detecting device and its detection method |
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