CN210300952U

CN210300952U - Portable auto-focusing fundus imaging system

Info

Publication number: CN210300952U
Application number: CN201920704769.XU
Authority: CN
Inventors: 潘爱霞; 李牧; 滕鹏伟
Original assignee: Shanghai New Eyes Medical Inc
Current assignee: Shanghai New Eyes Medical Inc
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-04-14
Anticipated expiration: 2029-05-17

Abstract

The utility model relates to the field of medical equipment design, in particular to a portable automatic focusing eyeground imaging system, wherein a fixed-vision LED lamp forms an image on the eyeground through a lens, a second reflector, a prism spectroscope and an ocular lens to provide a fixation point, the light emitted by an illuminating system is transmitted through an eyepiece and an eyeshade to illuminate the eyeground, the reflected light of the eyeground is imaged on a photosensitive chip in the automatic focusing system through the eyepiece, the prism spectroscope and an imaging lens group, an image processing chip contained in the automatic focusing system acquires an eyeground image acquired by the photosensitive chip and displays the eyeground image on a display screen of the display system, a key on the display screen controls the automatic focusing system to automatically focus, the eyeshade is used for completely covering a single eye, the automatic focusing system finds an optimal focusing value through continuously moving the position of the photosensitive chip, shooting is started, an imaging mode is entered, an image processing unit, the image is sent to a display system for displaying, the fundus image acquisition is completed, the accurate focusing is realized, and the imaging definition is improved.

Description

Portable auto-focusing fundus imaging system

Technical Field

The utility model relates to the field of medical instrument design, especially, relate to a portable auto focus eye ground imaging system.

Background

At present, most of portable fundus imaging devices on the market adopt a manual focusing mode, and some portable fundus imaging devices adopt a gear structure focusing mode. The focusing definition is subjectively judged by repeatedly adjusting the manual focusing of a shooting person, the efficiency is low, misjudgment is easy to generate, and deviation is easy to occur in shooting; moreover, the observation light and the imaging light have chromatic aberration, and manual compensation cannot be carried out, so that an image with observation definition can be obtained, and a focus is changed during imaging, so that the imaging is not clear.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defect that above-mentioned prior art exists, providing a portable auto focus eye ground imaging system, can realize quick, the accuracy focuses, improve the definition of formation of image.

The utility model provides a technical scheme that its technical problem adopted is: a portable auto-focusing eyeground imaging system comprises an imaging system, a fixation lamp system, an illuminating system, an auto-focusing system, a display system, an eyeshade and a shooting key, wherein the imaging system comprises an eyepiece, a prism, a first reflector, an imaging lens group, a photosensitive chip and a display screen module, the fixation lamp system comprises a fixation LED lamp, a lens, a second reflector, a prism spectroscope and an eyepiece, the fixation LED lamp forms an image on the eyeground through the lens, the second reflector, the prism spectroscope and the eyepiece to provide a fixation point, the illuminating system comprises a near infrared LED lamp and a plurality of visible light LED lamps, the light emitted by the illuminating system illuminates the eyeground through the eyepiece and the eyeshade, the eyeground reflected light is imaged on the photosensitive chip in the auto-focusing system through the eyepiece, the prism spectroscope and the imaging lens group, an image processing chip contained in the auto-focusing system acquires an eyeground image acquired by the photosensitive chip and displays the eyeground image on a, the keys on the display screen control the automatic focusing system to carry out automatic focusing, and the eyeshade and the shooting keys are fixed on the shell.

The automatic focusing system comprises a front fixed plate, a rear fixed plate, a motor, a screw rod mechanism and a moving block, wherein the motor, the screw rod mechanism and the moving block are arranged between the front fixed plate and the rear fixed plate, the motor drives the moving block to do linear reciprocating movement through the screw rod mechanism, two parallel guide rods are fixed between the front fixed plate and the rear fixed plate, a sliding plate is fixed on the moving block, the two guide rods vertically and freely pass through the plate surface of the sliding plate, the sliding plate is driven to move along the two guide rods when the moving block moves, a limit switch is arranged between the front fixed plate and the rear fixed plate, the sliding plate moves above the limit switch, a shielding piece triggering the limit switch is arranged at the bottom of the sliding plate, and a photosensitive chip is.

The front fixing plate and the rear fixing plate are vertically arranged and are parallel to each other.

The limit switch is in a U-shaped groove shape, and when the sliding plate moves, the shielding piece at the bottom of the sliding plate penetrates through the groove of the limit switch.

One of the guide rods close to the motor is sleeved with a spring and a shaft sleeve, one end of the spring is abutted against the front fixing plate, the other end of the spring is abutted against one end part of the shaft sleeve, and the other end part of the shaft sleeve is fixed on the sliding plate through screw connection.

The fixation LED lamp provides a plurality of positions of a fixation point in a visual field, including a plurality of positions at the center of the visual field and at the edge of the market.

Has the advantages that: when the eye shade is used, firstly, the eye shade is utilized to completely cover a single eye to form a darkroom, a fixed vision LED lamp of the fixed vision lamp system forms an image on the eyeground after passing through a lens, a second reflective mirror, a prism spectroscope and an eyepiece to provide a fixation point, a near infrared LED lamp of the illumination system is turned on, the light emitted by the near infrared LED lamp is used for illuminating the eyeground through the eyepiece and the eye shade, the reflected light of the eyeground is imaged on a photosensitive chip in an automatic focusing system through the eyepiece, the prism spectroscope and an imaging lens group, an image processing chip of the automatic focusing system acquires an eyeground image acquired by the photosensitive chip, the image processing chip displays the eyeground image acquired by the photosensitive chip on a display screen of the display system, a key on the display screen is clicked to enter an automatic focusing state, the automatic focusing system finds an optimal focusing value by continuously moving the position of the, the display system finishes focusing prompt signals through display of the display screen, the display system enters an imaging mode, the image processing unit closes a near-infrared LED lamp of the illumination system, the image processing unit opens a visible light LED lamp, visible light penetrates through an ocular lens and a pupil to illuminate the eye ground, reflected light of the eye ground passes through a binocular lens, a prism spectroscope and an imaging lens group to be imaged on a photosensitive chip, the image processing unit automatically acquires the clearest eye ground image, the most clear eye ground image is sent to the display system to be displayed, the eye ground image acquisition is finished, so that rapid and accurate focusing can be realized, and the imaging definition is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a block diagram of an auto focus system.

Detailed Description

The invention will be further described with reference to fig. 1-2.

A portable automatic focusing eyeground imaging system comprises an imaging system, a fixed-view lamp system, an illuminating system, an automatic focusing system, a display system, an eyeshade 10 and a shooting key 20, wherein the imaging system comprises an eyepiece 30, a prism 40, a first reflecting mirror, an imaging lens group, a photosensitive chip 69 and a display screen module, the fixed-view lamp system comprises a fixed-view LED lamp 51, a lens 52, a second reflecting mirror 53, a prism spectroscope and an eyepiece 30, the fixed-view LED lamp 51 forms an image on the eyeground through the lens 52, the second reflecting mirror 53, the prism spectroscope and the eyepiece 30 to provide a fixation point, the illuminating system comprises a near infrared LED lamp and a plurality of visible light LED lamps, light emitted by the illuminating system penetrates through the eyepiece 30 and the eyeshade 10 to illuminate the eyeground, eyeground reflected light passes through the eyepiece 30, the prism spectroscope and the imaging lens group to be imaged on the photosensitive chip 69 in the automatic focusing system, and an image processing chip contained in the automatic focusing system obtains an eyeground image On the display screen of the system, keys on the display screen control an automatic focusing system to carry out automatic focusing, and the eyeshade 10 and the shooting keys are fixed on the shell.

When the eye shade is used, firstly, the eye shade 10 is utilized to completely cover a single eye to form a darkroom, a fixed vision LED lamp 51 of the fixed vision lamp system forms an image on the eyeground after passing through a lens 52, a second reflecting mirror 53, a prism spectroscope and an eyepiece 30 to provide a fixation point, a near infrared LED lamp of the illumination system is turned on, the lamplight emitted by the near infrared LED lamp penetrates through the eyepiece 30 and the eye shade 10 to illuminate the eyeground, the eyeground reflected light passes through the eyepiece 30, the prism spectroscope and an imaging lens group to form an image on a photosensitive chip 69 in an automatic focusing system, an image processing chip of the automatic focusing system acquires an eyeground image acquired by the photosensitive chip 69, the image processing chip displays the acquired eyeground image acquired by the photosensitive chip 69 on a display screen of the display system, a key on the display screen is clicked to enter an automatic focusing state, the automatic focusing system finds an optimal focusing value by continuously moving the position of the photosensitive chip 69, the photographing is started, the imaging mode is entered, the image processing unit closes the near-infrared LED lamp of the illumination system, the image processing unit opens the visible light LED lamp, visible light penetrates through the ocular lens 30 and the pupil to illuminate the eye ground, reflected light of the eye ground passes through the binocular lens 30, the prism spectroscope and the imaging lens group to be imaged on the photosensitive chip 69, the image processing unit automatically acquires the clearest eye ground image, the clearest eye ground image is sent to the display system to be displayed, the eye ground image acquisition is completed, therefore, rapid and accurate focusing can be achieved, and imaging definition is improved.

Preferably, the automatic focusing system comprises a front fixing plate 61, a rear fixing plate 62, a motor 63, a lead screw mechanism 64 and a moving block 65, wherein both the motor 63, the lead screw mechanism 64 and the moving block 65 are arranged between the front fixing plate 61 and the rear fixing plate 62, the motor 63 drives the moving block 65 to do linear reciprocating movement through the lead screw mechanism 64, two parallel guide rods 66 are fixed between the front fixing plate 61 and the rear fixing plate 62, a sliding plate 67 is fixed on the moving block 65, the two guide rods 66 vertically and freely penetrate through the plate surface of the sliding plate 67, the sliding plate 67 is driven to move along the two guide rods 66 when the moving block 65 moves, a limit switch 68 is arranged between the front fixing plate 61 and the rear fixing plate 62, the sliding plate 67 passes above the limit switch 68 in the moving process, a shielding piece for triggering the limit switch 68 is arranged at the bottom of the sliding plate 67, and a photosensitive. The motor 63 drives the moving block 65, the sliding plate 67 and the photosensitive chip 69 to move together through the lead screw mechanism 64, the moving block 65 starts to move from the position of the limit switch 68, the motor 63 is synchronous with the photosensitive chip 69, the motor 63 controls the moving block 65 to move to a position, the photosensitive chip 69 acquires an image, the image processing unit calculates the high-frequency component focusing value and the low-frequency component focusing value of the fundus image, the image processing unit transmits the calculated focusing value to the control unit of the motor 63, the control unit of the motor 63 records the image focusing value and the position information corresponding to the position, the control unit of the motor 63 controls the motor 63 to reach the position of the moving block 65 corresponding to the optimal focusing value, after the optimal focusing position is reached, the control unit of the motor 63 continuously drives the photosensitive chip 69 to move forwards for a fixed distance to complete the near infrared and visible light color difference compensation, and the control unit of the motor 63 informs the, and completing focusing. The speed of the slide plate 67 can be controlled by changing the frequency of the pulse signal of the motor 63, and when the shielding piece at the bottom of the slide plate 67 approaches the limit switch 68, the limit signal is triggered, so that the slide plate stops moving or moves reversely.

Preferably, the front fixing plate 61 and the rear fixing plate 62 are vertically arranged and parallel to each other.

Furthermore, the limit switch 68 is in a U-shaped groove shape, and when the sliding plate 67 moves, the shielding piece at the bottom of the sliding plate 67 passes through the groove of the limit switch 68.

Further, one of the guide rods 66 adjacent to the motor 63 is sleeved with a spring 70 and a bushing 80, one end of the spring 70 abuts against the front fixing plate 61, the other end of the spring 70 abuts against one end of the bushing 80, and the other end of the bushing 80 is fixed on the sliding plate 67 by a screw connection. Wherein, axle sleeve 80 and slide 67 fixed connection for slide 67's removal is more steady, and in addition, screw mechanism 64 appears the movement clearance very easily because of wearing and tearing in the motion process, and the movement clearance can increase linear motion positioning error and appear the repeated positioning, has caused the noise big, the motion precision reduces scheduling problem. After the spring 70 is added, the spring 70 eliminates the movement clearance, and in addition, the shaft sleeve 80 is longer, so that the length of the matching surface is increased, and the guiding is more stable.

The fixation LED lamp 51 provides a plurality of positions of the fixation point within the field of view, including a plurality of positions at the center of the field of view and at the edge of the market.

It should be understood that the above description of the specific embodiments is only for the purpose of explanation and not for the purpose of limitation. Obvious changes or variations caused by the spirit of the present invention are within the scope of the present invention.

Claims

1. A portable auto-focusing fundus imaging system, characterized in that: comprises an imaging system, a fixation lamp system, an illuminating system, an automatic focusing system, a display system, an eye cover (10) and a shooting key (20), wherein the imaging system comprises an ocular (30), a prism (40), a first reflector, an imaging lens group, a photosensitive chip (69) and a display screen module, the fixation lamp system comprises a fixation LED lamp (51), a lens (52), a second reflector (53), a prism spectroscope and an ocular (30), the fixation LED lamp (51) forms an image on the eyeground through the lens (52), the second reflector (53), the prism spectroscope and the ocular (30) to provide a fixation point, the illuminating system comprises a near infrared LED lamp and a plurality of visible light LED lamps, the light emitted by the illuminating system penetrates through the ocular (30) and the eye cover (10) to illuminate the eyeground, the reflected light of the eyeground passes through the ocular (30), the prism spectroscope and the photosensitive chip (69) formed by the imaging lens group in the automatic, an image processing chip in the automatic focusing system acquires an eyeground image acquired by the photosensitive chip (69) and displays the eyeground image on a display screen of the display system, a key on the display screen controls the automatic focusing system to carry out automatic focusing, and the eyeshade (10) and a shooting key are fixed on the shell.

2. The portable autofocus fundus imaging system of claim 1, wherein: the automatic focusing system comprises a front fixing plate (61), a rear fixing plate (62), a motor (63), a screw rod mechanism (64) and a moving block (65), wherein the motor (63), the screw rod mechanism (64) and the moving block (65) are all arranged between the front fixing plate (61) and the rear fixing plate (62), the motor (63) drives the moving block (65) to do linear reciprocating movement through the screw rod mechanism (64), two parallel guide rods (66) are fixed between the front fixing plate (61) and the rear fixing plate (62), a sliding plate (67) is fixed on the moving block (65), the two guide rods (66) vertically and freely penetrate through the plate surface of the sliding plate (67), the sliding plate (67) is driven to move along the two guide rods (66) when the moving block (65) moves, a limit switch (68) is arranged between the front fixing plate (61) and the rear fixing plate (62), and the sliding plate (67) passes through the upper part of the limit switch (68), and the bottom of the sliding plate (67) is provided with a shielding sheet for triggering the limit switch (68), and the surface of the sliding plate (67) is internally provided with a photosensitive chip (69).

3. The portable autofocus fundus imaging system of claim 2, wherein: the front fixing plate (61) and the rear fixing plate (62) are vertically arranged and are parallel to each other.

4. The portable autofocus fundus imaging system of claim 3, wherein: the limit switch (68) is in a U-shaped groove shape, and when the sliding plate (67) moves, the shielding piece at the bottom of the sliding plate (67) penetrates through the groove of the limit switch (68).

5. The portable autofocus fundus imaging system of claim 4, wherein: one guide rod (66) close to the motor (63) is sleeved with a spring (70) and a shaft sleeve (80), one end of the spring (70) abuts against the front fixing plate (61), the other end of the spring (70) abuts against one end of the shaft sleeve (80), and the other end of the shaft sleeve (80) is fixed on the sliding plate (67) through screw connection.

6. The portable autofocus fundus imaging system of claim 5, wherein: the fixation LED lamp (51) provides a plurality of positions of a fixation point within a field of view, including a plurality of positions at a center position of the field of view and at a market edge.