A multi-field ocular surface imaging optical system

Abstract

The present invention provides a multi-field ocular surface imaging optical system, comprising a CMOS sensor, a first lens, a filter, a second lens for eliminating the spherical aberration, astigmatism and field curvature of the system, and a third lens for eliminating the spherical aberration and complex chromatic aberration of the system; the CMOS sensor and the first lens are fixed at a distance by a mechanism, the filter is installed on the filter switching system, the second lens and the third lens are fixed at a fixed distance on the lens group motion mechanism, and the first lens, the second lens and the third lens form a zoom system. The present invention can be applied to ocular surface disease diagnosis equipment, meet the switching of different fields of view in the ocular surface imaging system, and realize clear imaging under the switching of different fields of view in the ocular surface disease diagnosis equipment. The obtained image constitutes the clinical diagnosis basis of the doctor for the ocular surface disease. The system has few components, a simple and compact structure, and has the characteristics of high reliability, high stability, low cost and a wide range of applications.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-field imaging, and in particular to a multi-field ocular surface imaging optical system. Background Art

[0002] Ocular surface diseases generally refer to diseases that damage the normal structure and function of the corneal and conjunctival ocular surface. Since the ocular surface is a holistic concept, ocular surface diseases and tear diseases need to be combined functionally and summarized as ocular surface tear diseases.

[0003] At present, the imaging systems of ocular surface disease diagnosis equipment mostly use fixed field of view systems. If a large field of view system is used, the details of a small field of view cannot be displayed, and if a small field of view system is used, the whole picture of a large field of view cannot be displayed. Therefore, there is an urgent need for an optical system suitable for ocular surface disease diagnosis equipment that can clearly image different fields of view. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a multi-field-of-view ocular surface imaging optical system, which solves the problem that the imaging systems of existing ocular surface disease diagnostic equipment mostly adopt a fixed field-of-view system, and the use of a large field-of-view system cannot display the details in a small field of view, and the use of a small field-of-view system cannot display the overall picture of a large field of view.

[0005] The present invention provides a multi-field eye surface imaging optical system, comprising a CMOS sensor, a first lens, a filter, a second lens for eliminating the spherical aberration, astigmatism and field curvature of the system, and a third lens for eliminating the spherical aberration and complex chromatic aberration of the system; the CMOS sensor and the first lens are fixed at a distance by a mechanism, the filter is installed on a filter switching system, the second lens and the third lens are fixed at a fixed distance on a lens group movement mechanism, and the first lens, the second lens and the third lens form a zoom system.

[0006] Furthermore, centers of the CMOS sensor, the first lens, the filter, the second lens, and the third lens are on the same axis.

[0007] Furthermore, the CMOS sensor is a high-resolution color sensor.

[0008] Furthermore, the focal length of the first lens is 10 mm to 30 mm.

[0009] Furthermore, the optical filters include visible light bandpass filters, blue-green narrowband filters, and infrared long-wave pass filters.

[0010] Furthermore, the visible light bandpass filter, the blue-green light narrowband filter, and the infrared long-wave pass filter are fixed on a rotating wheel of the filter switching system at intervals of 120 degrees.

[0011] Furthermore, the second lens is a meniscus lens.

[0012] Furthermore, the third lens is a double cemented achromatic lens.

[0013] Furthermore, the zoom system includes a small field of view, a medium field of view, and a large field of view.

[0014] Furthermore, the small field of view is the pupil area, the medium field of view is the cornea area, and the large field of view is the entire eye including the area around the eye.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention provides a multi-field ocular surface imaging optical system, comprising a CMOS sensor, a first lens, a filter, a second lens for eliminating the spherical aberration, astigmatism and field curvature of the system, and a third lens for eliminating the spherical aberration and complex chromatic aberration of the system; the CMOS sensor and the first lens are fixed at a distance by a mechanism, the filter is installed on the filter switching system, the second lens and the third lens are fixed at a fixed distance on the lens group motion mechanism, and the first lens, the second lens and the third lens form a zoom system. The present invention can be applied to ocular surface disease diagnosis equipment, meet the switching of different fields of view in the ocular surface imaging system, and realize clear imaging under different field of view switching in the ocular surface disease diagnosis equipment. The obtained image constitutes the clinical diagnosis basis of the doctor for the ocular surface disease, and can be combined with Placido rings or Placido cones to form a corneal topograph, and can also be combined with other devices to form other ocular surface disease diagnosis equipment. The system has few components, a simple and compact structure, and has the characteristics of high reliability, high stability, low cost and a wide range of applications.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is a schematic diagram of a multi-field ocular surface imaging optical system of the present invention.

[0020] In the figure: 1, CMOS sensor; 2, first lens; 3, filter; 4, second lens; 5, third lens. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0022] A multi-field ocular surface imaging optical system that achieves clear imaging of various parts of the ocular surface such as the meibomian glands, cornea, pupil, etc. Figure 1 As shown, it includes a CMOS sensor 1, a first lens 2, a filter 3, a second lens 4 for eliminating partial spherical aberration, astigmatism and field curvature of the system, and a third lens 5 for eliminating partial spherical aberration and complex chromatic aberration of the system; the second lens 4 and the third lens 5 eliminate most of the aberrations that affect the imaging quality, and the filter 3 eliminates the stray light that affects the imaging quality, meeting the conditions for clear imaging of the optical system, the CMOS sensor 1 and the first lens 2 are fixed at a distance by a mechanism, the filter 3 is installed on the filter switching system, the second lens 4 and the third lens 5 are fixed at a fixed distance on the lens group movement mechanism, and the first lens 2, the second lens 4, and the third lens 5 form a zoom system. Preferably, the centers of the CMOS sensor 1, the first lens 2, the filter 3, the second lens 4, and the third lens 5 are on the same axis. Preferably, the CMOS sensor 1 is a high-resolution color sensor, specifically, the pixel is greater than 5 million, and the pixel size is not less than 2μ.

[0023] In one embodiment, preferably, the filter 3 includes a visible light bandpass filter, a blue-green narrowband filter, and an infrared long-wave pass filter. Preferably, the visible light bandpass filter, the blue-green narrowband filter, and the infrared long-wave pass filter are fixed on the rotating wheel of the filter switching system at intervals of 120 degrees. In this embodiment, the filter switching system is a rotating motor, which realizes the switching of the visible light bandpass filter, the blue-green narrowband filter, and the infrared long-wave pass filter.

[0024] In one embodiment, preferably, the focal length of the first lens 2 is 10 mm to 30 mm. Preferably, the second lens 4 is a meniscus lens. Preferably, the third lens 5 is a double cemented achromatic lens. In this embodiment, the lens group movement mechanism is a stepping motor to achieve coaxial movement of the second lens 4 and the third lens 5 by 0 to 100 mm. Preferably, the zoom system includes a small field of view, a medium field of view, and a large field of view. Preferably, the small field of view is the pupil area, the medium field of view is the corneal area, and the large field of view is the entire eye including the area around the eye. The zoom system enables each different field of view to be clearly imaged, which is particularly suitable for ocular surface disease diagnosis equipment and can greatly improve the efficiency and convenience of ocular surface disease diagnosis equipment. Specifically, when the second lens 4 and the third lens 5 are 10mm to 20mm away from the first lens 2 at a fixed distance, the working distance of the optical system is 105mm to 110mm, and the field of view of the optical system is 30mm, which can complete the system's imaging of the entire eye including the area around the eye; when the second lens 4 and the third lens 5 are 20mm to 30mm away from the first lens 2 at a fixed distance, the working distance of the optical system is 100mm to 105mm, and the field of view of the optical system is 15mm, which can complete the system's imaging of the corneal area; when the second lens 4 and the third lens 5 are 30mm to 40mm away from the first lens 2 at a fixed distance, the working distance of the optical system is 95mm to 100mm, and the field of view of the optical system is 5mm, which can complete the system's imaging of the pupil area. The above optical system is applied to ocular surface disease diagnosis equipment to meet the switching of different fields of view in the ocular surface imaging system, realize clear imaging under switching of different fields of view in the ocular surface disease diagnosis equipment, and form clear imaging of different fields of view of the pupil area, corneal area, whole eye and meibomian gland area around the eye.

[0025] The present invention provides a multi-view ocular surface imaging optical system, comprising a CMOS sensor 1, a first lens 2, a filter 3, a second lens 4 for eliminating the spherical aberration, astigmatism and field curvature of the system, and a third lens 5 for eliminating the spherical aberration and complex chromatic aberration of the system; the CMOS sensor 1 and the first lens 2 are fixed at a distance by a mechanism, the filter 3 is mounted on the filter switching system, the second lens 4 and the third lens 5 are fixed at a fixed distance on the lens group motion mechanism, and the first lens 2, the second lens 4 and the third lens 5 form a zoom system. The present invention can be applied to ocular surface disease diagnosis equipment, meet the switching of different fields of view in the ocular surface imaging system, realize clear imaging under different field of view switching in the ocular surface disease diagnosis equipment, and the obtained image constitutes the clinical diagnosis basis of the doctor for the ocular surface disease, can be combined with Placido rings or Placido cones to form a corneal topograph, and can also be combined with other devices to form other ocular surface disease diagnosis equipment, the system has few components, simple and compact structure, high reliability, high stability, low cost and wide application range.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A multi-field ocular surface imaging optical system, characterized in that: The system comprises a CMOS sensor, a first lens, a filter, a second lens for eliminating the spherical aberration, astigmatism and field curvature of the system, and a third lens for eliminating the spherical aberration and achromatic aberration of the system; the CMOS sensor and the first lens are fixed at a distance by a mechanism, the filter is mounted on a filter switching system, the second lens and the third lens are fixed at a fixed distance on a lens group movement mechanism, and the first lens, the second lens and the third lens form a zoom system; The zoom system includes a small field of view, a medium field of view, and a large field of view; the second lens and the third lens are at different distances from the first lens at a fixed distance to form the small field of view, the medium field of view, and the large field of view; Wherein, the distance from the first lens when forming the large field of view is smaller than the distance from the first lens when forming the medium field of view; The distance from the first lens when forming the medium field of view is smaller than the distance from the first lens when forming the small field of view; The focal length of the first lens is 10 mm to 30 mm.

2. A multi-field ocular surface imaging optical system according to claim 1, characterized in that: Centers of the CMOS sensor, the first lens, the filter, the second lens, and the third lens are on the same axis.

3. The multi-field ocular surface imaging optical system according to claim 1, characterized in that: The CMOS sensor is a high-resolution color sensor.

4. The multi-field ocular surface imaging optical system according to claim 1, characterized in that: The optical filters include visible light bandpass filters, blue-green narrowband filters, and infrared long-wave pass filters.

5. A multi-field ocular surface imaging optical system as claimed in claim 4, characterized in that: The visible light bandpass filter, the blue-green light narrowband filter, and the infrared long-wave pass filter are fixed on the rotating wheel of the filter switching system at intervals of 120 degrees.

6. The multi-field ocular surface imaging optical system according to claim 1, characterized in that: The second lens is a meniscus lens.

7. The multi-field ocular surface imaging optical system according to claim 1, characterized in that: The third lens is a double cemented achromatic lens.

8. The multi-field ocular surface imaging optical system according to claim 1, characterized in that: The small field of view is the pupil area, the medium field of view is the cornea area, and the large field of view is the entire eye including the area around the eye.

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