CN2618557Y - Optometer for detecting retina using space grating - Google Patents

Abstract

The utility model relates to an ophthalmology inspection polemics, concretely speaking is an optometer which uses the spatial light shed to produce interference fringe in order to inspect the retinal. The optometer includes a coat and an internal optical system, that is characterized in that: the optical system includes a light source device which is used to produce parallel beam, a light shed device which can make the parallel beam produced by the light source device to diffractive thus to produce the interference fringe and a focusing mechanism which focuses the diffracted beam to the dioptric system of the eyes inspected. The parallel beam irradiates on the light shed, produces diffraction, forms the interference fringe, the interference fringe which falls on the dioptric system of the eyes inspected after focused by the focusing mechanism is two or plural minimal spot and very thin beam, so can pass the dioptric system and form interference fringed image on the retinal, thus can detect the retinal practical visual acuity of the sick eye which has the sick of refractive media opacity.

Description

A kind ofly check amphiblestroid visuometer with space grating

Technical field: this utility model relates to a kind of ophthalmologic examination instrument, specifically a kind ofly produces interference fringe with space grating and checks amphiblestroid visuometer.

Background technology: refracting media nubecula such as cataract are one of more common diseases of present ophthalmology, and existing Therapeutic Method comparatively effectively and completely generally is to adopt operative treatment.But lack a kind of effective means or instrument now and can before operation, the amphiblestroid vision to the patient carry out precheck, to make the judgement that whether can perform the operation, so that some patient but still can not recover vision because of amphiblestroid disease well after the operation of success, the misery and the medical expense loss of operation have been stood in vain, also caused the loss of medical resource, even more serious is therefore to make the treatment to retinal diseases increase difficulty, even has lost the chance of treatment.

Summary of the invention: the purpose of this utility model is to provide a kind of visuometer that can carry out the retina examination of visual acuity to the trouble eye of suffering from refracting media nubecula.

For achieving the above object, of the present utility modelly check amphiblestroid visuometer with space grating, comprise shell and internal optics system thereof, it is characterized in that: described optical system comprises a light supply apparatus that is used to produce collimated light beam, thereby one makes grating device that collimated light beam generation diffraction that described light supply apparatus produces produces interference fringe and one that described diffracted beam is focused on focusing in the tested refraction of eye system.

Adopt the visuometer of technique scheme, the light beam that light source sends is through becoming after the collimation mechanism on the collimated light beam irradiation grating, produce diffraction, form interference fringe, this light intensity by the interference fringe of Sine distribution through being two or several minimum luminous points and very thin light beam on the dioptric system that drops on tested eye after the focusing of focusing, so can form the image of interference fringe sample by dioptric system and on retina, thereby can detect amphiblestroid actual vision to the trouble eye of suffering from refracting media nubecula.

The utility model is described in further detail below in conjunction with accompanying drawing, and provide embodiment.

Description of drawings:

Accompanying drawing 1 is this utility model specific embodiment one structural representation;

Accompanying drawing 2 is this utility model specific embodiment two structural representations;

Accompanying drawing 3 is this utility model optical system light path sketch map.

Specific embodiment one: as shown in Figure 1, the shell of visuometer by several tubular substantially handles 27, lamp socket 22, prism table 16, connect cover 15 and grating dish seat 21 and handwheel 17, the inner chamber size and the battery of handle 27 constitutes battery compartment (can certainly directly introduce power supply from the outside and remove battery compartment from) movingly provides working power for light source 1; Lamp socket 22 inner chambers are provided with two-stage shoulder rank, after being installed in circular bakelite fixing head 26 centers as the light emitting diode of light source 1, place on the subordinate shoulder rank, it is fixing to put into external diameter and lamp socket 22 inner chamber internal diameters tubular packing ring 25, brightness decay sheet 2, ring washer 24, light barrier 3 and trim ring 23 movingly subsequently in proper order successively, light source 1 also can adopt other suitable light-emitting component such as bulb etc., and the purpose that brightness decay sheet 2 is set is to adjust the suitable brightness of light source 1; Grating dish seat 21 is the truncated cone member that a upper base center has boss, the center is provided with the cylindrical die cavity that passes for light beam, the die cavity inwall is provided with the shoulder rank that collimating lens 4 is installed, and collimating lens 4 lies on the shoulder rank, and opposite side is fixed with lens ring trim ring 20; It is adaptive and be interconnected on lamp socket 22 higher levels by screw thread and take on the rank that the boss external diameter of grating dish seat 21 and lamp socket 22 higher levels take on the rank internal diameter, the loophole of collimating lens 4, light barrier 3 and the central axis of light emitting diode overlap on same axis and with lamp socket 22, handle 27 central shafts, loophole will be on the focal plane of collimating lens 4 exactly, makes light that light emitting diode sends produce required collimated light beam behind the loophole of light barrier 3 and collimating lens 4; Grating dish 18 cards are circular, be provided with vertical rotation axis 19 in the heart in the one side panel face, on grating dish 18 cards several saturating windows 29 can be set evenly with one heart as required, this specific embodiment is provided with 10 saturating windows 29, the size of saturating window 29 should adapt with the light path visual field, be set with the different lenticular lenses of spatial frequency 5 respectively in the saturating window 29, lenticular lenses 5 can adopt the photo partitioning to make, on the grating dish seat 21 another side relative with boss be provided with one with grating dish 18 corresponding, eccentric and part falls within the outer circular-shaped, concave cavity of end face edge, the circle centre position of circular-shaped, concave cavity is provided with the blind hole parallel with primary optical axis and constitutes axis hole, the rotating shaft 19 of grating dish 18 is inserted in the axis hole movingly, the radius size of grating dish 18 cards should with circular-shaped, concave cavity movingly, and the rotary motion trace that makes window 29 drops in the beam path and grating dish 18 card part edges fall within outside the grating dish seat 21, forms the grating switching mechanism thus; Connect cover 15 and also be Cylinder shape constructional element, the top is provided with cover plate 14 sealings, the lower end is promptly pasted a side mutually with grating dish seat 21 and is provided with external diameter and is connected end face with the same big annular of grating dish seat 21 diameters, the tubular diameter connects the end face diameter root less than annular and forms shoulder rank, connecing cover 15 inner chambers constitutes by two sections, hypomere is cylindrical, epimere is that the cross section is foursquare four prism type, thereby the foursquare length of side forms shoulder rank less than the diameter of cylindrical cavity, prism table 16 is that central authorities are provided with the cylinder that runs through the square column die cavity vertically, profile with connect cover 15 hypomeres cylindrical die cavity movingly, Dove prism is fixedly installed in the prism table 16, prism table 16 is inserted movingly and is connect cover 15 hypomeres and by shoulder rank location, annular hand 17 is set in movingly and connects on the cover 15 outer roots, be drilled with a pin-and-hole until prism table 16 walls from handwheel 17 outside vertical in connecing cover 15 central shafts, connecing cover radially is provided with width on 15 walls and is slightly larger than the pin-and-hole diameter, angle equals the saturating groove of 180 degree, pin 28 inserts in the pin-and-hole and drops on groove, handwheel 17 constitutes interlock with prism table 16, form the stripe direction governor motion, in order to block those scatterings and unnecessary light, can block 6 at the visual field light that prism table 16 light inputting ends are provided with a similar light barrier 3; Connecing Amici prism 8 is set in the cover 15 inner chamber epimeres is also can observe the dioptric position whether light focusing point drops on tested eye by this Amici prism 8 for doctor when checking, therefore connect the coaxial unthreaded hole that was drilled with on the two side of overlapping corresponding Amici prism 8 refractive light paths on 15, one side is crossed sight glass 11 is set in the unthreaded hole, and opposite side is crossed the eyeglass seat 13 that ocular 9 is housed is set in the unthreaded hole.

Specific embodiment two: as shown in Figure 2, other structures of the visuometer of present embodiment are identical with embodiment one, different is: described grating switching mechanism is provided with a flattened rectangular grating frame 30, be provided with several saturating windows 29 on the grating frame 30 along its length, be set with the different lenticular lenses of spatial frequency 5 respectively in the saturating window 29, be provided with movingly between grating frame 30 and the shell and run through shell and make lenticular lenses 5 planes and primary optical axis vertically be inserted in inserting slot construction in the beam path.

During use, the hand-holdable visuometer of doctor also can be fixed on the support, allows the trouble eye lean against on the eyeglass seat 13, and the doctor observes by the sight glass 11 of opposite side simultaneously; In the time will regulating the direction of interference fringe, rotatable handwheel 17 drives prism 7 rotations and changes the interference fringe direction; Allow the lenticular lenses 5 of different space frequency enter in the light path with hands rotating shutter dish 18 exposed edge, can detect different visions; Embodiment two allows the lenticular lenses 5 of different space frequency enter in the light path by pulling grating frame 30, also can detect different visions.

Claims (6)

1, a kind ofly checks amphiblestroid visuometer with space grating, comprise shell and internal optics system thereof, it is characterized in that: described optical system comprises a light supply apparatus that is used to produce collimated light beam, thereby one makes grating device that collimated light beam generation diffraction that described light supply apparatus produces produces interference fringe and one that described diffracted beam is focused on focusing in the tested refraction of eye system.

2, according to claim 1ly check amphiblestroid visuometer with space grating, it is characterized in that: described light supply apparatus comprises that a light source (1), a collimating lens that is made of convex lens (4) and one are arranged between light source (1) and the collimating lens (4) and place light barrier (3) on described collimating lens (4) focal plane, which is provided with a loophole; Described grating device is provided with a plurality of lenticular lenses (5) and grating switching mechanisms that can as required selected lenticular lenses (5) be switched in the light path with different space frequency.

3, according to claim 2ly check amphiblestroid visuometer with space grating, it is characterized in that: described grating switching mechanism comprises a grating dish (18) with rotating shaft parallel with primary optical axis (19), grating dish (18) card is vertical with primary optical axis, be evenly distributed with several saturating windows (29) on grating dish (18) card with one heart, be set with the different lenticular lenses of spatial frequency (5) respectively in the saturating window (29), saturating window (29) rotary motion trace drops in the beam path.

4, according to claim 2ly check amphiblestroid visuometer with space grating, it is characterized in that: described grating switching mechanism is provided with a flattened rectangular grating frame (30), be provided with several saturating windows (29) on the grating frame (30) along its length, be set with the different lenticular lenses of spatial frequency (5) respectively in the saturating window (29), be provided with movingly between grating frame (30) and the shell and run through shell and make lenticular lenses (5) plane and primary optical axis vertically be inserted in inserting slot construction in the beam path.

5, describedly check amphiblestroid visuometer according to claim 3 or 4, it is characterized in that: also be provided with image rotation prism (7) and the stripe direction governor motion thereof that is used to regulate diffracted beam interference fringe direction in the light path of described visuometer between lenticular lenses (5) and focusing with space grating.

6, according to claim 5ly check amphiblestroid visuometer with space grating, it is characterized in that: described image rotation prism (7) is made of Dove prism.

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