CN107978212B - Objective type simulation eye convenient for adjusting top focal power - Google Patents
Objective type simulation eye convenient for adjusting top focal power Download PDFInfo
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- CN107978212B CN107978212B CN201711341222.XA CN201711341222A CN107978212B CN 107978212 B CN107978212 B CN 107978212B CN 201711341222 A CN201711341222 A CN 201711341222A CN 107978212 B CN107978212 B CN 107978212B
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- 238000004088 simulation Methods 0.000 title claims description 7
- 230000004308 accommodation Effects 0.000 claims abstract description 4
- 210000001747 pupil Anatomy 0.000 abstract description 3
- 210000001525 retina Anatomy 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/28—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for medicine
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Abstract
The present invention relates to an objective simulated eye facilitating accommodation of a top power, comprising: a base, on which a plano-convex lens and a diffuse reflection screen are arranged in parallel from front to back, and an aperture diaphragm is arranged in front of the plano-convex lens; and the adjusting device is arranged on the base and is used for adjusting the distance between the diffuse reflection screen and the plano-convex lens. The diffuse reflection screen is equivalent to retina, the plano-convex lens is equivalent to refractive system of human eye, the aperture diaphragm is equivalent to pupil of human eye, and the distance between diffuse reflection screen and plano-convex lens is equivalent to length of eye axis. The distance between the diffuse reflection screen and the plano-convex lens is adjusted by the adjusting device to directly adjust the top focal power, and compared with the prior art, the device is more convenient to use because the top focal power is adjusted by standard equipment with different top focal powers.
Description
Technical Field
The invention relates to the field of medical instruments, in particular to an objective simulated eye which is convenient for adjusting top focal power.
Background
The objective type simulated eyes developed by the national institute of metrology and science comprise 11 sets of objective type simulated eyes which are 0D, ±2.5D, ±5D, ±10D, ±15D, ±20D, namely, a plurality of standard equipment are manufactured by taking a plurality of interval top powers, and if the objective type simulated eyes have the measuring range exceeding the top power range or want to measure a plurality of different top powers, the set of simulated eyes cannot meet the requirements; the set of simulation eyes are a plurality of independent objective simulation eyes, can not be integrated into a whole for use or carried, are scattered, are easy to lose and are inconvenient to carry; and the simulated eye of the China national institute of metrology now offers more than 4 ten thousand RMB, and the price is higher.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the objective simulation eye which is convenient for adjusting the top focal power, can directly adjust the top focal power and has good convenience.
The present invention solves the above-mentioned problems by: objective simulated eye facilitating adjustment of a top power, comprising:
a base, on which a plano-convex lens and a diffuse reflection screen are arranged in parallel from front to back, and an aperture diaphragm is arranged in front of the plano-convex lens;
and the adjusting device is arranged in the base and is used for adjusting the distance between the diffuse reflection screen and the plano-convex lens.
The diffuse reflection screen is equivalent to retina, the plano-convex lens is equivalent to refractive system of human eye, the aperture diaphragm is equivalent to pupil of human eye, and the distance between diffuse reflection screen and plano-convex lens is equivalent to length of eye axis. The distance between the diffuse reflection screen and the plano-convex lens is adjusted by the adjusting device to directly adjust the top focal power, and compared with the prior art, the device is more convenient to use because the top focal power is adjusted by standard equipment with different top focal powers.
Further, the adjusting device is used for adjusting the position of the diffuse reflection screen or the plano-convex lens. The diffuse reflection screen or the plano-convex lens can be adjusted in position, so that the diffuse reflection screen and the plano-convex lens can be adjusted in distance, and the effect of convenient adjustment is achieved.
Further, the plano-convex lens and the diffuse reflection screen are respectively arranged on the base through the first bracket and the second bracket, and the distance between the diffuse reflection screen and the plano-convex lens is adjusted by adjusting the position of the first bracket or the second bracket through the adjusting device.
Further, the base is also provided with a guide rail with scales, and the adjusting device is used for adjusting the first bracket or the second bracket to move on the guide rail. The distance between the diffuse reflection screen and the plano-convex lens can be measured through scales, so that the corresponding top focal power can be obtained conveniently through the measured distance.
Further, when the adjusting device is used for adjusting the first bracket to move on the guide rail, a secondary ruler is arranged on the first bracket; when the adjusting device is used for adjusting the second bracket to move on the guide rail, a secondary ruler is arranged on the second bracket; the scale on the guide rail is used as a main scale, and a vernier caliper structure is formed by matching with an auxiliary scale. This arrangement helps to further improve the accuracy of the measurement.
Further, the first bracket and/or the second bracket are/is a three-dimensional adjusting bracket. Therefore, the plano-convex lens and the diffuse reflection screen have good space three-dimensional adjusting effect.
Further, an expanding lens frame for placing the plano-convex lens is arranged in front of the aperture diaphragm. The lens frame is expanded, the lens groups with different top focal powers can be placed on the lens frame to expand a larger sphere lens top focal power range, the applicability is strong, and the invention can replace the existing multiple standard simulated eye devices by only one simulated eye, thereby being convenient to carry and reducing the cost.
Further, the adjusting device comprises a rotary table and a rotating piece connected with the rotary table, the rotating piece is installed in the base, a first thread structure is arranged on the rotating piece, and a second thread structure meshed with the first thread structure is arranged on the corresponding first support or second support. The rotating piece is rotated through the turntable, and the first support or the second support is made to advance or retreat through the mutual meshing rotation of the first thread structure and the second thread structure.
Compared with the prior art, the invention has the beneficial effects that: the adjustable simulated eye top focal power is realized through the adjusting device, the vernier caliper structure is further arranged to improve the measuring precision, and the lens frame is expanded to improve the measuring range.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the main scale and the auxiliary scale of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific embodiments and drawings.
An objective simulated eye as shown in fig. 1 for facilitating accommodation of a top power, comprising:
a base 10 on which a plano-convex lens 1 and a diffuse reflection screen 5 are mounted in parallel from front to back through a first bracket 4 and a second bracket 6; an expanding lens frame 2 and an aperture diaphragm 3 are arranged in front of the first bracket 4 from front to back; the base 10 is also provided with a guide rail 7 with scales, and the second bracket 6 is arranged in the guide rail 7;
the adjusting device comprises a rotary table 13 and a rotary piece 14 connected with the rotary table 13, wherein the rotary piece 14 is arranged in the base 10, a first thread structure 9 is arranged on the rotary piece 14, and a second thread structure 8 meshed with the first thread structure 9 is arranged at the lower end of the second bracket 6.
A secondary ruler 12 is arranged on the second bracket; the scale on the guide rail 7 is used as a main scale 11, and a vernier caliper structure is formed by matching with an auxiliary scale 12.
The first bracket 4 and the second bracket 6 are three-dimensional adjusting frames, so that the plano-convex lens and the diffuse reflection screen have good space three-dimensional adjusting effect.
In the specific implementation process, the plano-convex lens 1 is a lens with a focal length f of 40mm, which is equivalent to a refractive system of human eyes, and is manufactured by optical glass with Abbe number v between 58 and 60, the optical surface of the plano-convex lens should be optically polished, and other surfaces should be clean but can be roughly processed; the diameter of the light transmission hole of the aperture diaphragm 3 is 4mm, which is equivalent to the pupil of human eyes; the secondary ruler is 49mm long.
The correspondence between the simulated eye top power D and the distance D of the diffuse reflecting screen from the plano-convex lens is shown in the following table:
it is clear from the above table that the range Δd=0.05 m to 0.03333 m=0.01667 m=16.67 mm in which the second holder is required to be moved is required to achieve a change in the power of-5D to +5d sphere, and therefore, it is only necessary to set the main scale at the 0D position of the guide rail 7 after determining the position on the guide rail 7 where the simulated eye top power is 0D. The method for finding and determining the 0D position of the guide rail 7 comprises the following steps:
s1, firstly, ensuring whether 0D reading of an objective refractometer is accurate or not through an objective simulation eye with top focal power of 0D developed by China research institute of metering science, and particularly finding the accurate 0D reading of the objective refractometer in a mode of repeated measurement and metering uncertainty;
s2, measuring the simulated eye in the embodiment through the optometry instrument, enabling the diffuse reflection screen 5 to move along the guide rail 7 by rotating the rotary table 13, and finding the accurate position of the simulated eye top focal power of 0D through the accurate 0D reading of the optometry instrument.
The main rule is at least 9mm long in front of 0D and at least 11mm long behind 0D, and the total length of the auxiliary rule is 49mm, so that the main rule is at least 69mm long on the basis that the front-back length of 0D is at least 49mm. The partial enlargement is as shown in fig. 2: the minimum graduation of the main scale is 1mm, the auxiliary scale is provided with 50 small equal graduations, the total length of the auxiliary scale is equal to 49mm, and therefore each graduation of the vernier is different from the minimum graduation of the main scale by 0.02mm.
The working principle of the invention is as follows:
during measurement, through carousel 13 rotatory rotating member 14, through first helicitic texture 9 and 8 intermeshing rotations of second helicitic texture for second support 6 advances or retreats along guide rail 7, can conveniently adjust the distance between first support 4 and the second support 6, also conveniently adjust the distance between plano-convex lens 1 and the diffuse reflection screen 5 promptly, reach the effect of conveniently adjusting top power, utilize slide caliper's principle simultaneously, read out the distance in 0D position on second support 6 and the guide rail through main scale 11 and auxiliary scale 12 cooperation, adjust according to the top power that different distances correspond, until adjusting to suitable top power, measurement accuracy is high.
If the measurement exceeds the measuring range, the lens frame 2 can be further provided with + -5D, + -10D, + -15D, + -20D and other optometric lens groups to expand a larger sphere top focal power range, and then the lens frame is matched with the-5D to +5D sphere top focal power change to realize the high-precision measurement covering the whole range of the measuring range, so that the invention has strong applicability, and can replace the existing multiple standard simulated eye devices by only one simulated eye, thereby being convenient to carry and reducing the cost.
Claims (4)
1. Objective simulated eye convenient for adjusting top focal power, characterized by comprising: a base, on which a plano-convex lens and a diffuse reflection screen are arranged in parallel from front to back, and an aperture diaphragm is arranged in front of the plano-convex lens; the adjusting device is arranged in the base and is used for adjusting the distance between the diffuse reflection screen and the plano-convex lens; an expanding lens frame for placing the plano-convex lens is also arranged in front of the aperture diaphragm;
the diffuse reflection screen is arranged on the base through a first bracket and a second bracket, and the distance between the diffuse reflection screen and the diffuse reflection lens is adjusted by adjusting the position of the first bracket or the second bracket through an adjusting device;
the base is also provided with a guide rail with scales, and the adjusting device is used for adjusting the first bracket or the second bracket to move upwards on the guide rail;
when the adjusting device is used for adjusting the first bracket to move on the guide rail, the auxiliary ruler is arranged on the first bracket, or when the adjusting device is used for adjusting the second bracket to move on the guide rail, the auxiliary ruler is arranged on the second bracket; the scale on the guide rail is used as a main scale, and a vernier caliper structure is formed by matching with an auxiliary scale;
the plano-convex lens is a lens with a focal length f of 40mm, and the diameter of a light hole of the aperture diaphragm is 4mm;
the simulated eye top focal power D is changed within the range of-5D to +5D, and the change range of the distance D between the diffuse reflection screen and the plano-convex lens is 0.03333 m-0.05 m;
the range Δd=0.05 m-0.03333 m=0.01667 m=16.67 mm for the second carriage to move;
the length of the main scale is more than or equal to 69mm, the minimum graduation is 1mm, 50 small equal division graduations are arranged on the auxiliary scale, the total length is equal to 49mm, and each graduation of the vernier is different from the minimum graduation of the main scale by 0.02mm.
2. The objective simulated eye facilitating adjustment of a top power of claim 1, wherein said adjustment means is for adjusting the position of a diffuse reflecting screen or a plano-convex lens.
3. The objective simulation eye for facilitating adjustment of a top focal power according to claim 2, wherein the adjustment device comprises a turntable and a rotating member connected with the turntable, the rotating member is installed in the base, a first thread structure is provided on the rotating member, and a second thread structure engaged with the first thread structure is provided on the corresponding first bracket or second bracket.
4. An objective simulated eye facilitating accommodation of a top power as claimed in any of claims 1 to 3, wherein said first and/or second support is a three-dimensional accommodation support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711341222.XA CN107978212B (en) | 2017-12-14 | 2017-12-14 | Objective type simulation eye convenient for adjusting top focal power |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711341222.XA CN107978212B (en) | 2017-12-14 | 2017-12-14 | Objective type simulation eye convenient for adjusting top focal power |
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| CN107978212A CN107978212A (en) | 2018-05-01 |
| CN107978212B true CN107978212B (en) | 2024-03-22 |
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| CN201711341222.XA Active CN107978212B (en) | 2017-12-14 | 2017-12-14 | Objective type simulation eye convenient for adjusting top focal power |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2218524Y (en) * | 1994-10-28 | 1996-01-31 | 王莉茹 | Standard simulate eye for objective computer optometry instrument |
| CN1126580A (en) * | 1994-10-28 | 1996-07-17 | 王莉茹 | Standard model eye for subjective optometer |
| US5677750A (en) * | 1995-03-29 | 1997-10-14 | Hoya Corporation | Apparatus for and method of simulating ocular optical system |
| CN102540638A (en) * | 2012-01-05 | 2012-07-04 | 中航华东光电有限公司 | Detection device for focal position and detection method thereof |
| CN104749791A (en) * | 2015-01-15 | 2015-07-01 | 中山大学中山眼科中心 | Optical focusing regulating lens and optical focusing regulating method |
| CN205234447U (en) * | 2015-12-01 | 2016-05-18 | 重庆远视科技有限公司 | Automatic optometry top of head dioptric strength governing system |
| CN208351782U (en) * | 2017-12-14 | 2019-01-08 | 广东省医疗器械质量监督检验所 | Convenient for adjusting the Objective model eye of vertex lens power |
-
2017
- 2017-12-14 CN CN201711341222.XA patent/CN107978212B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2218524Y (en) * | 1994-10-28 | 1996-01-31 | 王莉茹 | Standard simulate eye for objective computer optometry instrument |
| CN1126580A (en) * | 1994-10-28 | 1996-07-17 | 王莉茹 | Standard model eye for subjective optometer |
| US5677750A (en) * | 1995-03-29 | 1997-10-14 | Hoya Corporation | Apparatus for and method of simulating ocular optical system |
| CN102540638A (en) * | 2012-01-05 | 2012-07-04 | 中航华东光电有限公司 | Detection device for focal position and detection method thereof |
| CN104749791A (en) * | 2015-01-15 | 2015-07-01 | 中山大学中山眼科中心 | Optical focusing regulating lens and optical focusing regulating method |
| CN205234447U (en) * | 2015-12-01 | 2016-05-18 | 重庆远视科技有限公司 | Automatic optometry top of head dioptric strength governing system |
| CN208351782U (en) * | 2017-12-14 | 2019-01-08 | 广东省医疗器械质量监督检验所 | Convenient for adjusting the Objective model eye of vertex lens power |
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| CN107978212A (en) | 2018-05-01 |
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