CN218209385U - Contact type fundus imager wide-angle lighting device - Google Patents

Abstract

The utility model discloses a contact eye ground imager's wide-angle lighting device belongs to eye ground imaging device field. The utility model discloses a mainly include first lens, optic fibre bundle and light source, one side and the eye cornea direct contact of first lens, for curvature radius is close people's eye's cornea curvature radius's arc concave surface, the opposite side then encircles marginal round and is provided with optic fibre bundle, and optic fibre bundle's end is provided with the light source. The emergent end surface of the optical fiber bundle is formed by combining a plurality of planes or curved surfaces and is used for changing the angle of emergent light of the optical fiber bundle and the illumination brightness. The utility model discloses an adopt and grind adjustment fiber bundle outgoing end face, realized among the prior art the similar even better effect of multistage formula illumination leaded light device commonly used to very big depression the cost of manufacturing.

Description

Contact type fundus imager wide-angle lighting device

Technical Field

The utility model belongs to eye ground imaging device field, specifically speaking relates to a wide-angle lighting device of contact eye ground imager.

Background

Retinopathy of infants, such as fundus oculi disorders like ROP, often occurs from the edge of the fundus oculi, and when performing fundus examination, patients cannot cooperate with doctors to rotate the eyeball to examine the periphery of the retina. It is therefore desirable to use an ultra-wide angle fundus camera with a very large field of view, all of which contact the surface of the eyeball, as close as possible to the pupil to obtain the maximum viewing angle.

The lens of the fundus camera directly contacts the surface of the eyeball, the imaging lens is arranged in the middle of the lens, the edge circle is an annular illumination light path, and the effective illumination caliber of the annular illumination light guide device cannot be larger than 8mm because the maximum diameter of the pupil of the human eye is only 8mm after the pupil is dilated.

For example, in the chinese patent No. 2014800287584, a multi-section illumination light guide device is designed, and the illumination light is controlled to exit from different angles through multiple refraction and reflection, so as to realize large-angle fundus illumination. The contact lens is limited by the size of eyes, the size of a light guide part is required to be very small, the surface shape is complex, the requirement on the size precision is high, the conventional processing method cannot finish processing, ultra-precision processing equipment is required, the processing technology is complex, the difficulty is extremely high, only a plurality of suppliers in the global range can process devices meeting the requirement at present, the processing cost is very high, and the processing period is relatively long. And the light guide device made of optical plastic through cold machining is low in light guide efficiency and large in energy loss, and the light guide device made of plastic is low in hardness, so that the surface of the device is easily scratched to cause reduction of reflection efficiency and stray light emission in the use processes of assembly and the like.

Therefore, a new design of a light guide device with a large illumination angle, uniform illumination, simple structure, and lower manufacturing and using costs than plastic materials is needed.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned problem that prior art exists, the utility model aims to provide a contact eye ground imager's wide-angle lighting device.

In order to solve the above problem, the utility model discloses the technical scheme who adopts as follows:

the large-angle illuminating device of the contact type fundus imager comprises a first lens, an optical fiber bundle and a light source, wherein the optical fiber bundle is annularly arranged on one side of the first lens, the light source is arranged at one end, away from the first lens, of the optical fiber bundle, and a plurality of emergent end faces are arranged at one end, close to the first lens, of the optical fiber bundle.

And a second lens is arranged on one side of the first lens, which is provided with the optical fiber bundle.

And a shielding ferrule is arranged between the second lens and the optical fiber bundle.

One side of the shielding ferrule close to the optical fiber bundle is a black extinction surface.

And a light transmitting sheet is arranged between the light outlet end of the optical fiber bundle and the first lens.

One side of the light-transmitting sheet close to the optical fiber bundle is a smooth and clean plane, and one side of the light-transmitting sheet close to the first lens is a frosted plane.

The plurality of exit end faces are any one of:

a continuous or discontinuous combination of planes;

a continuous or discontinuous combination of curved surfaces;

a combination of a flat surface and a curved surface.

The included angle between the optical fiber bundle and the optical axis of the first lens is 20-45 degrees.

The diameter of the excircle of the optical fiber bundle is 5-11mm.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses an adjustment optic fibre emergent terminal surface's scheme has avoided the requirement of the multistage formula illumination leaded light device of plastics material among the prior art to size precision, reduction manufacturing cost and the production degree of difficulty that can be very big, simultaneously because the characteristic of plastics material, prior art has the problem that leaded to reflection efficiency to descend on the low easy fish tail surface of leaded light device hardness. The emergent end face of the optical fiber bundle is adjusted by grinding, so that the effect similar to or even better than that of the prior art can be realized, and the production and manufacturing cost is greatly reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

FIG. 2 is a schematic view of an exit end of a planar optical fiber bundle;

FIG. 3 is a schematic view of an exit end of a curved fiber bundle;

FIG. 4 is a partial schematic view of embodiment 2;

in the figure: 1. a first lens; 2. a fiber optic bundle; 3. a shielding ferrule; 4. a light source; 5. a heat dissipating component; 6. a second lens; 7. an exit angle; 8. a first exit end face; 9. a second exit end face; 10. a light transmitting sheet.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

Example 1

As shown in fig. 1, the present invention mainly includes a first lens 1 and an optical fiber bundle 2.

One side of the first lens 1 is in direct contact with the cornea of the eye, and is shaped like an arc concave surface which is attached to the eyeball, and the curvature radius is close to the curvature radius of the cornea of the human eye. The other side of the first lens 1 is provided with the optical fiber bundle 2, and the optical fiber bundle 2 is arranged around the edge of the first lens 1 in a circle, so that the range of the light source output by the optical fiber bundle 2 is circular. The included angle of the optical fiber bundle 2 relative to the optical axis of the first lens 1 is 20-45 degrees, all the optical fiber bundles 2 are integrally in a hollow cone shape, and the diameter of the outer circle of each optical fiber bundle 2 is 5-11mm thick.

On the side of the first lens 1 where the fiber bundle 2 is disposed, there is also provided a second lens 6, and the second lens 6 is tapered to be responsible for an imaging portion of the fundus illuminating device. A circle of conical shielding ferrule 3 is arranged between the second lens 6 and the optical fiber bundle 2, one side of the shielding ferrule 3 close to the optical fiber bundle 2 is a black extinction surface and is used for isolating the light leaked from the side surface of the optical fiber bundle 2 and preventing the light from being radiated into the second lens 6 to generate stray light so as to influence the imaging effect.

The black extinction surface has various kinds of choice, can adopt electroplating blackening, also can scribble black extinction coating or adopt oxidation blackening, as long as can play the function of absorbing the stray light that leaks out of the optic fibre side, and various processes and production methods all can be applicable to and cover ferrule 3.

The tail end of the optical fiber bundle 2 is provided with an LED light source 4, a heat dissipation component 5 for assisting the light source 4 in heat dissipation is arranged behind the light source 4, and a metal block with a high heat conductivity coefficient, which is adopted by the heat dissipation component 5, can quickly dissipate heat on the LED, so that the overhigh junction temperature of the LED is avoided, and the service life of the LED light source can be effectively prolonged.

The type of the light source 4 is not limited to the LED light source, and only because the LED light source is a suitable light source in the related art, a more suitable light source 4 can be used in the fundus camera field, and the type of the light source 4 can be replaced.

The main feature of the design is that the optical fiber bundle 2 is close to the illumination exit end face of the first lens 1, and the exit end face of the optical fiber bundle 2 is not an integral plane or curved surface, as shown in fig. 2, wherein the exit end face includes two parts, namely a first exit end face 8 and a second exit end face 9, both exit end faces are planes, but the angles of the exit planes are different, and the generated illumination exit angle 7 is larger than that of a single plane.

As shown in fig. 3, the first exit end surface 8 is a curved surface, and the second exit end surface is a flat surface, so that the change of the overall light-emitting angle is not large, but the ratio of light to light can be adjusted according to the radian of the curved surface, and the illumination brightness in different areas can be adjusted according to actual requirements.

The number of the exit end surfaces is not limited to the total two exit end surfaces of the first exit end surface 8 and the second exit end surface 9 illustrated in this embodiment, and may be any number of combinations of planes and planes, combinations of planes and curved surfaces, and combinations of curved surfaces and curved surfaces, and the number of the planes and the curved surfaces and the radian of the curved surfaces are adjusted according to actual needs.

Example 2

The whole structure of this embodiment is identical to that of embodiment 1, except that a ring-shaped light-transmitting sheet 10 is disposed between the first lens 1 and the optical fiber bundle 2, as shown in fig. 4.

The side of the light-transmitting sheet 10 facing the optical fiber bundle 2 is a smooth plane, the side facing the first lens 1 is a frosted plane, and the light-transmitting sheet is fixed on the conical shielding ferrule 3, and the size of the outer circle of the light-transmitting sheet 10 is larger than that of the light-emitting boundary of the optical fiber bundle 2, so that all the optical fibers emitted by all the optical fiber bundles 2 surrounding the first lens 1 can completely pass through the light-transmitting sheet 10.

When the optical fiber is emitted from the light-emitting end of the fiber bundle 2 and passes through the light-transmitting sheet 10, the light can become more uniform, and the illumination effect can be better adjusted.

The utility model discloses compare in the multistage formula illumination leaded light device among the prior art, avoided the use to need adopt the optics plastics of the high grinding precision of high refracting index, saved the processing cost and the material cost of ultraprecision machining optics plastics. The grinding of the emergent end face of the optical fiber bundle 2 is adopted, and the combination of a plurality of planes or curved surfaces is matched to adjust the illumination angle and the illumination intensity, so that the effect similar to or even better than that of the prior art is realized.

Claims (9)

1. The large-angle illuminating device of the contact type fundus imager is characterized by comprising a first lens, an optical fiber bundle and a light source, wherein the optical fiber bundle is annularly arranged on one side of the first lens, the light source is arranged at one end, away from the first lens, of the optical fiber bundle, and a plurality of emergent end faces are arranged at one end, close to the first lens, of the optical fiber bundle.

2. The device as claimed in claim 1, wherein the first lens is provided with a second lens on the side of the optical fiber bundle.

3. The device as claimed in claim 2, wherein a shielding ferrule is disposed between the second lens and the fiber bundle.

4. The wide angle illuminator for a contact fundus imager of claim 3, wherein said shielding ferrule has a black extinction surface on the side adjacent to the bundle.

5. The large angle illuminator of claim 1, wherein a light transmissive plate is disposed between the first lens and the end of the fiber bundle adjacent to the first lens.

6. The device as claimed in claim 5, wherein the light transmissive sheet is smooth and frosted on the side adjacent the first lens.

7. The high-angle illuminator for a contact fundus imager of claim 1, wherein said exit facets are either:

a continuous or discontinuous combination of planes;

a continuous or discontinuous combination of curved surfaces;

a combination of a flat surface and a curved surface.

8. A contact fundus imager macro-angle illuminator as claimed in claim 1 wherein said fiber bundle is angled between 20-45 ° from the optical axis of said first lens.

9. The large-angle illuminator for a contact fundus imager of claim 1, wherein the diameter of the outer circle of said fiber bundle is 5-11mm.

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