CN202654102U - Image collecting device applied to corneal topographical instrument - Google Patents
Image collecting device applied to corneal topographical instrument Download PDFInfo
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- CN202654102U CN202654102U CN 201220210906 CN201220210906U CN202654102U CN 202654102 U CN202654102 U CN 202654102U CN 201220210906 CN201220210906 CN 201220210906 CN 201220210906 U CN201220210906 U CN 201220210906U CN 202654102 U CN202654102 U CN 202654102U
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Abstract
The utility model discloses an image collecting device applied to a corneal topographical instrument. The image collecting device applied to the corneal topographical instrument comprises a device shell provided with a though hole, an image collecting system located inside the device shell and a three-dimensional mobile platform installed on the image collecting system. The image collecting system comprises a CCD (Charge Coupled Device) image imaging system with a CCD camera, a lens system and an optical projecting device. The three-dimensional mobile platform is driven by a stepping motor. The stepping motor and the CCD camera are controlled by an upper computer with an image display device. The optimum location between the image collecting system and human cornea can be adjusted through an image collecting software window of the image display device of the upper computer. The image collecting device can replace human hands to adjust the relative location of the image collecting system and human cornea precisely and images of the human cornea are collected by applying an overlook location collecting method which replaces the conventional front location collecting method. The image collecting device applied to the corneal topographical instrument provided by the utility model is simple and convenient to operate and high in accuracy.
Description
Technical field
This utility model relates to a kind of cornea image collecting device, relates in particular to a kind of cornea image collecting device with automatic positioning function.
Background technology
Have in the market the multiple corneal topographers product based on the different measuring principle, measuring method commonly used has Placido dish method, crack scanning method, Three-dimensional triangle grating Grid Projection method, interferometry etc.Wherein the corneal topographers based on Placido dish method is most widely used the most, and the Placido dish is a chequered with black and white donut.When checking with the Placido dish, the examiner understands the flexibility of cornea by the picture of the concentric ring on the observation of the aperture in the dish examinee cornea.Normal cornea picture should be the concentric circular of rule, and regular astigmatism is difform ellipse, and irregular astigmatism then is irregular cornea picture.
Comprise the EyeSys2000 type corneal topographers that U.S. EyeSys company produces, the TMS-4 type corneal topographers that many beautiful (TOMEY) companies of Japan produce, the Keratograph corneal topographers that Germany OCULUS company produces, the Modi EYETOP2005 corneal topographers that Italy CSO company produces etc., these all are based on Placido dish principle and produce.These corneal topographers all are by after the donut on the placido dish is looked like to project anterior corneal surface reflecting, and by CCD the reflection virtual image of anterior corneal surface are collected the input computer and process.
The image capture device of corneal topographers is comprised of image capturing system, three-D displacement system and device housings.Focusing mode by the three-D displacement system in the prior art all adopts manual joystick to regulate the relative position of cornea and image capturing system that is taken, thereby finishes accurate location.Disclose a kind of corneal topographers structure among the US Patent No. 20030231283A1 such as the people such as Sergio Mura application, used stick during adjusting, manually adjusted the position of image capturing system according to the top to bottom, left and right, front and rear direction.Wherein moving up and down, is to finish by swivel lever, and left-right and front-back moves and wants the moving stick of passing of armrest to finish.
There is following shortcoming in above corneal topographers in measurement:
1, because the accurate collection of corneal image is based on placido dish, CCD camera and the accurate location of eye cornea on (X, Y, Z) three-dimensional.Moving forward and backward (Y dimension) is that the anterior corneal surface vertex position is adjusted at best acquisition system focal position, can have influence on unconsciously the location of position, the left and right sides (X dimension) during manipulation, makes the cornea image deflecting angle center membrane of collection.
2, when ophthalmologist or examiner's corneal image acquisition, in the situation that needs to judge whether to aim at by the image on the eyes observation computer screen, position with the hand adjustment finishing equipment is aimed at focusing, the poor operability of this design, and it is convenient not manually to adjust.
3, the structural design of this corneal topographers adopts the top view structure, namely in carrying out the cornea image gatherer process, the detected person need to sit positive health, faces the placido dish in the place ahead, and forehead is close to the forehead contact site, lower jaw is placed on the jaw platform, facial over against the placido dish to guarantee, in this case, the detected person is easy to cause sense of discomfort, and side occurs and turns in head easily, causes measurement error.
The utility model content
This utility model provides a kind of cornea image collecting device, this equipment can replace staff to come relative position between fine adjustment image capturing system and the eye cornea, and uses and overlook formula positioning acquisition method and replace the traditional formula of facing positioning acquisition method to gather the image of eye cornea.
A kind of image capture device for corneal topographers, comprise the device housings that is provided with light hole, be positioned at the image capturing system of this device housings and the three-dimensional mobile platform of described image capturing system is installed, described image capturing system comprises ccd image imaging system, lens combination and the optical projection means with the CCD camera, described three-dimensional mobile platform is by step motor drive, and this motor and CCD camera all are controlled by the host computer with image display device.
Image display device shows the change amplitude of described motor and CCD camera control signal by graphical interfaces.At examinee's face when eyes are looked down by light hole down, the operator observes the position at CCD camera place at the image capture software window of host computer, and by the scroll bar in the image capture software window being moved the working signal that produces motor, motor drives the three-D displacement platform movement, makes image capturing system and examinee's canthus be in best collection position.
Described three-dimensional mobile platform comprises: the first displacement platform that is slidingly matched along X-axis with described device housings; The second displacement platform that is slidingly matched along Y-axis with described the first displacement platform; Be fixed on the arm of lifting on described the second displacement platform, lift the support platform that arm is installed described image capturing system along Z axis being used for of being slidingly matched with described, described X-axis, Y-axis and Z axis are spatially vertical in twos.Image capturing system is installed on the three-dimensional mobile platform, by regulating three-dimensional mobile platform, can make image capturing system be in best collection position; X-axis, Y-axis and Z axis are respectively the glide direction of the first displacement platform, the second displacement platform and support platform, and namely the first displacement platform, the second displacement platform and support platform are mutually vertical in twos in glide direction.
Described motor is the first motor, the second motor and the 3rd motor that is respectively applied to drive the first displacement platform, the second displacement platform and support platform.The first motor, the second motor and the 3rd motor drive respectively the first displacement platform, the second displacement platform and support platform by ball screw/nut, slide at X-axis, Y-axis and Z axis thereby drive three-dimensional mobile platform, to adjust the position between image capturing system and the eye cornea.
Described the first displacement platform, the second displacement platform and support platform be decussation roller guide rail and described device housings, the first displacement platform by correspondence and lift arm and be slidingly matched respectively.The decussation roller guide rail is a kind of linear rolling track of precision, has higher bearing capacity and higher rigidity, to perseveration, start, stop can to reduce complete machine weight and drive mechanism power in the higher situation of reciprocating frequency.Adopt the decussation roller guide rail can obtain higher sensitivity and high performance plane and straight line fortune, force of rolling friction is low, and stability is good, and is easy to install, can improve the positioning accuracy of equipment.
Described host computer is by the described motor of motor control card control.Motion control card is connected with host computer by the USB connecting line, be based on the PC bus, utilize high-performance microprocessor (such as DSP) and field programmable gate function to realize a kind of high performance motor motion control card of the multiaxis coordination control of a plurality of motors, comprise pulse output, step-by-step counting, the numeral input, numeral output, the functions such as D/A output, it can send continuous, high-frequency train of pulse, the frequency of sending pulse by change is controlled the speed of motor, change the position that the quantity of sending pulse controls motor, its pulsed output mode comprises single pulse mode and double pulse modes.Step-by-step counting can be used for the position feedback of encoder, and accurately position of machine is provided, and corrects the error that produces in the transmission process.Fortune power control fabrication will realize that the bottom software of motor control and hardware integration be in the same place, and make it have the required various speed of step motor control, Position Control function, and these functions can be called easily by computer.
Described light hole is positioned at the top of described device housings.In the prior art, the cornea image collecting device adopts the mode of top view, use this mode detected person and be easy to cause sense of discomfort, and head side occurs easily turns, and causes measurement error.Adopt light hole to be positioned at the design at device housings top, guarantee the measured in measuring process face all the time over against below, thereby avoid that the head rotation because of the measured causes test error when test.
The top of described device housings is provided with baffle plate that can adjusting position and supports the pallet of the movement of measured's chin.According to the difference of people face shape, reconcilable baffle plate and pallet movably guarantee that position and the light hole of human eye adapts.During observation, make measured's head prop up baffle plate, measured's chin in the pallet holder, realizes fixing to the head part, avoids that the head rotation because of the measured causes test error when test.
The inwall at described device housings top is provided with the striped that points to the light hole position.The direction indication of each white small arrow of direction striped namely be the direction of light hole, can carry out in the test process the examinee like this, when regulating the relative position of image capturing system and examinee's cornea by host computer, in the image display device of host computer, demonstrate white arrow, the operator only need to move the direction of image capturing system by the arrow indication, both can realize aiming at of image capturing system and examinee's cornea.
Image capture device of the present utility model can be regulated the relative position between image capturing system and the eye cornea automatically, and is simple to operation, and accuracy is high, and the cornea image of shooting is more accurate, makes things convenient for processing data information.
Description of drawings
Fig. 1 is the structural representation of the image capture device for corneal topographers of the present utility model.
Fig. 2 is the structural representation of the device housings of image capture device of the present utility model.
Fig. 3 is lens combination organigram of the present utility model.
Fig. 4 is the fundamental diagram of image capturing system of the present utility model and three-dimensional mobile platform.
Fig. 5 is the work sheet of the image capture software window in the image display device of the present utility model.
Fig. 6 is the direction striped sketch map on the inner surface at device housings of the present utility model top.
The specific embodiment
As shown in Figure 1, a kind of image capture device that is applied in the corneal topographers, this cornea image collecting device comprises: be provided with the device housings 1 of light hole 12, be positioned at the image capturing system 2 of outer 1 shell of this equipment and the three-dimensional mobile platform 3 of installation image capturing system 2.
Image capturing system 2 is made of ccd image imaging system 21, optical projection means and lens combination 23.Ccd image imaging system 21 is made of CCD camera, drive circuit, 1394 connecting lines and 1394 cards.Optical projection means is made of LED-backlit source and placido dish 22.Lens combination 23 is made of frequency modulated light circle 231, battery of lens 232, pinhole diaphragm 233, half-reflecting half mirror 234, LED lamp 235 and lens barrel structure 236.
Three-dimensional mobile platform 3 comprises: the first displacement platform 33 that is slidingly matched along X-axis with device housings 1, the second displacement platform 37 that is slidingly matched along Y-axis with the first displacement platform 33, be fixed on and lift arm 32 on the second displacement platform 37, with the support platform 31 that image capturing system 2 be used for to be installed of lifting arm 32 and being slidingly matched along Z axis, motor is the first motor 34, the second motor 35 and the 3rd motor 36 that is respectively applied to drive the first displacement platform 33, the second displacement platform 37 and support platform 31, and X-axis, Y-axis and Z axis are spatially vertical in twos.The first displacement platform 33, the second displacement platform 37 and support platform 31 all by the decussation roller guide rail respectively with described device housings 1, the first displacement platform 33 with lift arm 34 and be slidingly matched.
As shown in Figure 2, the top of device housings 1 is provided with baffle plate 11, light hole 12, pallet 13 and fixed tray 14.
When cornea image gathers, eye cornea places on the light hole 12 of cornea image collecting device, three-dimensional mobile platform 3 can carry out moving freely adjustment on X-axis, Y-axis, the Z axis three-dimensional by the first motor 34, the second motor 35 and the 3rd motor 36, image capturing system 2 is aimed at the eye cornea of taking, image capturing system 2 is taken the eye cornea image when the optimum distance that moves to apart from eye cornea automatically.
In the image capturing system 2, placido dish 22 is arranged from top to bottom successively, LED-backlit source, lens combination 23, ccd image imaging system 21.As shown in Figure 3, wherein the frequency modulated light circle 231 in the lens combination 23 is positioned at the center tapping of placido dish 22, half-reflecting half mirror 234 is 45 ° and places under the frequency modulated light circle 231, pinhole diaphragm 233 is placed with half-reflecting half mirror 234 a distance on same level, LED lamp 235 places after the pinhole diaphragm 233, the light that LED lamp 235 sends is through too becoming a light spot on half-reflecting half mirror 234 behind the pinhole diaphragm 233, luminous point impinges upon on the eye cornea surface after being reflected by half-reflecting half mirror 234, impinges upon the lip-deep luminous point of eye cornea and is used for collimating effect.Battery of lens 232 places a distance under the half-reflecting half mirror 234, is the CCD camera in the ccd image imaging system 21 under the battery of lens 232.The virtual image of the placido dish 22 of eye cornea reflection is imaged on the CCD camera through half-reflecting half mirror 234.
Wherein placido dish 22 is the large placido dish that 24 chequered with black and white donuts consist of, its basal surface type is a kind of free quadratic surface structure, this free quadratic surface structure can radius be the virtual image that becomes of the coquille of 8mm substantially in one plane, the main body of placido dish 22 consists of the lucite that adopts a kind of uniform-light transmission, the main body back side of placido dish 22 adopts frosted to process, and coils the printing opacity uniformity of 22 integral body to improve placido.The main center of Placido dish 22 has logical light aperture.The main body front of Placido dish 22 outwards is aligned in sequence with 12 Crape rings that are in the light from the center tapping, Crape ring is that organic printing ink forms, bright ring cross arrangement with 12 printing opacities, in the situation with LED-backlit source lighting, the good uniform-light transmission of bright ring, thus Crape ring can stop light and forms 24 chequered with black and white donuts.
Wherein the LED-backlit source is made of wiring board, LED lamp array, drive circuit.Wherein LED lamp array is to arrange in the circuit board the annular light source that consists of by LED lamp pearl, and wherein drive circuit is used to LED lamp array that constant-voltage driving power source is provided.
Wherein ccd image imaging system 21 is made of CCD camera, drive circuit, 1394 connecting lines and 1394 cards.The CCD camera adopts a kind of black and white area array CCD chip, and the CCD camera provides driving pulse by drive circuit, and 1394 cards are used for being connected of CCD camera and host computer.Ccd image imaging system 21 mainly be collect the image of cornea and the upper computer software that is sent in for analysis.
In three-dimensional mobile platform 3, support platform 31 is positioned at the topmost position of three-dimensional mobile platform 3, be positioned under the image capturing system 2, support platform 31 with lift arm 32 and be connected, lifting arm 32 is vertically fixed on the second displacement platform 37, lifting arm 32 upper ends one side is the 3rd motor 36, lifting below the arm 32 is the second displacement platform 37, be the first displacement platform 33, the first motors 34 below the second displacement platform 37 be connected motor 35 respectively by drive lead screw and the first displacement platform 33 be connected displacement platform 37 and be connected.
As shown in Figure 4, the fundamental diagram of image capturing system 2 and three-dimensional mobile platform 3.Three-dimensional mobile platform 3 is connected respectively by 3 motors (the first motor 34, the second motor 35 and the 3rd motor 36) to be controlled.Motion control card is connected respectively with the first motor 34, the second motor 35 and the 3rd motor 36 by wire, the control signal that motion control card transmits host computer, be converted into the driving pulse square wave, control respectively the rotation direction of each motor with this, velocity of rotation and rotary state.
The main body of device housings 1 is that length and width are 40cm, the cube structure of high 20cm, the side has the connecting interface of 1394 connecting lines, USB connecting line, power line, the top of device housings 1 is provided with light hole 12, on it by the baffle plate 11 that slides, the light hole 12 of pallet 13, fixed tray 14 and device housings 1 forms, baffle plate is equipped with advance ball 11 times, can move front and back, can be fixed and remove fixing operation by rotating the baffle plate 11 of fixedly turning round mobile, pallet also is equipped with advance ball 13 times, can move forward and backward, and fixing by fixedly twisting into row.The light hole 12 of device housings 1 is the in the same size of two oval light hole 12, two oval light holes 12 opening of top center position, and each central point distance is 50mm.In measuring process, the measured bends to face down and inwardly observes placido dish 22 by light hole 12, the examiner is by the position of front and back controllable register 11, make measured's head prop up baffle plate 11, fixed tray 14 is supported on measured's the bridge of the nose, pallet 13 is holding in the palm measured's chin, guarantee the measured in measuring process face all the time over against below, thereby avoid that the head rotation because of the measured causes test error when test.
With reference to Fig. 5, the work process of this image capture device is as follows: at examinee's face when eyes are looked down by light hole 12 down, the operator is in the position at the image viewing CCD camera place that the image capture software window of host computer forms, and by the scroll bar 4 in the image capture software window being moved the working signal that produces the first motor 34 and the second motor 35, the first motor 34 and the second motor 35 drive respectively the first displacement platform 33 and the second displacement platform 37 moves, make image capturing system 2 and examinee's cornea in X-axis, after Y direction is aimed at, click again and move up and down button 5, make image capturing system 2 upwards or downwards carry out distance adjustment by certain speed, when making when reaching required distance between image capturing system 2 and the measured's cornea, be that image capturing system 2 is can collect the most clearly cornea image the time, click image acquisition button 6, finish the collection of corneal image.
As shown in Figure 6, has the direction striped around the light hole 12 on the inwall at device housings top, the direction indication of each white small arrow namely is the direction of light hole 12 among the figure, can carry out in the test process the examinee like this, when regulating the relative position of image capturing system 2 and examinee's cornea by host computer, demonstrate white arrow in the video window of host computer, the operator only need to move image capturing system 2 by the direction of arrow indication both can realize aiming at of image capturing system 2 and examinee's cornea.
Claims (8)
1. image capture device that is used for corneal topographers, comprise the device housings that is provided with light hole, be positioned at the image capturing system of this device housings and the three-dimensional mobile platform of described image capturing system is installed, described image capturing system comprises ccd image imaging system, lens combination and the optical projection means with the CCD camera, it is characterized in that, described three-dimensional mobile platform is by step motor drive, and this motor and CCD camera all are controlled by the host computer with image display device.
2. the image capture device for corneal topographers as claimed in claim 1 is characterized in that, described three-dimensional mobile platform comprises: the first displacement platform that is slidingly matched along X-axis with described device housings; The second displacement platform that is slidingly matched along Y-axis with described the first displacement platform; Be fixed on the arm of lifting on described the second displacement platform, lift the support platform that arm is installed described image capturing system along Z axis being used for of being slidingly matched with described, described X-axis, Y-axis and Z axis are spatially vertical in twos.
3. the image capture device for corneal topographers as claimed in claim 2, it is characterized in that described motor is the first motor, the second motor and the 3rd motor that is respectively applied to drive the first displacement platform, the second displacement platform and support platform.
4. the image capture device for corneal topographers as claimed in claim 3, it is characterized in that described the first displacement platform, the second displacement platform and support platform be decussation roller guide rail and described device housings, the first displacement platform by correspondence and lift arm and be slidingly matched respectively.
5. the image capture device for corneal topographers as claimed in claim 1 is characterized in that, described host computer is by the described motor of motor control card control.
6. the image capture device for corneal topographers as claimed in claim 1 is characterized in that, institute's light hole is positioned at the top of described device housings.
7. the image capture device for corneal topographers as claimed in claim 6 is characterized in that, the top of described device housings is provided with baffle plate that can adjusting position and supports the pallet of the movement of measured's chin.
8. the image capture device for corneal topographers as claimed in claim 6 is characterized in that, the inwall at described device housings top is provided with the striped that points to the light hole position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220210906 CN202654102U (en) | 2012-05-11 | 2012-05-11 | Image collecting device applied to corneal topographical instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220210906 CN202654102U (en) | 2012-05-11 | 2012-05-11 | Image collecting device applied to corneal topographical instrument |
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| CN202654102U true CN202654102U (en) | 2013-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220210906 Expired - Fee Related CN202654102U (en) | 2012-05-11 | 2012-05-11 | Image collecting device applied to corneal topographical instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102657512A (en) * | 2012-05-11 | 2012-09-12 | 浙江工业大学 | Image acquisition equipment applied to corneal topography instrument |
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2012
- 2012-05-11 CN CN 201220210906 patent/CN202654102U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102657512A (en) * | 2012-05-11 | 2012-09-12 | 浙江工业大学 | Image acquisition equipment applied to corneal topography instrument |
| CN102657512B (en) * | 2012-05-11 | 2014-12-31 | 浙江工业大学 | Image acquisition equipment applied to corneal topography instrument |
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| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20130511 |