CN215374437U - Optical parameter detection device for fundus camera - Google Patents
Optical parameter detection device for fundus camera Download PDFInfo
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- CN215374437U CN215374437U CN202120533215.5U CN202120533215U CN215374437U CN 215374437 U CN215374437 U CN 215374437U CN 202120533215 U CN202120533215 U CN 202120533215U CN 215374437 U CN215374437 U CN 215374437U
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Abstract
The utility model discloses an optical parameter detection device for a fundus camera, which comprises a backlight plate and a detection screen, wherein the backlight plate provides a light source, the detection screen integrates a view field, a magnification scale and a resolution line array, the view field and the magnification scale comprise x-axis, y-axis, x 'and y' -axis scale marks, the included angle between the x 'axis and the positive direction of the x axis is 45 degrees, and the included angle between the y' axis and the positive direction of the x axis is 135 degrees; the resolution line array comprises 4 line groups, and the line width and the line interval of the line groups are the same; resolution line arrays with different line widths are respectively arranged at the position of the center of the field of view, the middle of the field of view and the edge of the field of view of the fundus camera, which correspond to the field of view and the scale with magnification. The utility model integrates the field scale, the magnification scale and the resolution line arrays of different fields, can realize that the eye fundus camera can detect three parameters of field, magnification and resolution by 1 time of shooting, and greatly simplifies the detection process.
Description
Technical Field
The utility model belongs to the field of optical detection, and particularly relates to an optical parameter detection device for an eye fundus camera.
Background
After the eye fundus camera is actually processed and assembled, the field of view, the magnification factor and the resolution ratio of the eye fundus camera need to be measured and calculated, and the errors of the actual parameters and the theoretical design parameters and whether the errors can reach the shipment standard are checked.
In international YY0634-2008 (ophthalmology instruments fundus camera), the field of view is detected by taking a screen at a position 1m from the exit pupil of the fundus camera; the magnification is detected by shooting a screen marked with a 100mm scale 1m from the fundus camera; the resolution is to photograph resolution line arrays at positions 1m from the fundus camera and place the resolution line arrays at different view field positions for detection (three times of placement is needed, namely, the resolution line arrays are placed at the central view field, the middle view field and the edge view field of the fundus camera once respectively). Therefore, in the conventional inspection, at least three kinds of apparatuses are required to perform five inspections in total to confirm the actual field of view, the magnification, and the different field of view resolutions of the fundus camera, which is troublesome.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the utility model aims to provide an optical parameter detection device for an eye fundus camera, wherein a view field scale, a magnification scale and a resolution line array are integrated into a whole, so that 1-time shooting of the eye fundus camera can be realized, and three parameters of the view field, the magnification and the resolution are detected.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
an optical parameter detection device for an eye fundus camera is characterized by comprising a backlight plate and a detection screen on the backlight plate, wherein the backlight plate provides a light source for the detection screen, and the size of the backlight plate is larger than or equal to that of the detection screen;
the radius of the detection screen is larger than 41.5cm, and the detection screen integrates a view field, a magnification scale and a resolution line array; the view field and magnification scale comprises scale marks of an x axis, a y axis, an x 'axis and a y' axis, wherein the included angle between the x 'axis and the positive direction of the x axis is 45 degrees, and the included angle between the y' axis and the positive direction of the x axis is 135 degrees; the maximum scale on the scale mark is larger than 41.5cm, each grid is set to be 1mm, and the scale comprises 100 mm;
the resolution line array comprises 4 line groups, and resolution line arrays with different line widths are respectively arranged at the positions of the center of the field of view, the middle of the field of view and the edge of the field of view of the fundus camera, which correspond to the field of view and the scale with magnification.
Furthermore, the number of lines of each line group is odd number which is larger than 3, lines of the line group of the group a are parallel to the x axis, lines of the line group of the group b are parallel to the y axis, an included angle between the lines of the line group of the group c and the y axis is 45 degrees, an included angle between the lines of the line group of the group d and the x axis is 45 degrees, and the line width and the line interval of each group are the same.
Further, the optical parameter detection device is placed at the exit pupil 1m of the fundus camera in use, and the optical axis of the fundus camera and the mechanical axis of the optical parameter detection device are made coaxial.
Further, the positions of the center of the field of view, the middle of the field of view and the edge of the field of view of the fundus camera, which correspond to the field of view and the magnification scale respectively, are determined by the design value of the full field of view of the fundus camera; the line width of the resolution line array is determined by the design value of the magnification of the fundus camera and the lowest resolution in the international YY0634-2008 for the center of the field of view, the middle of the field of view and the edge of the field of view of the fundus camera, respectively.
Furthermore, the view field, the magnification scale and the resolution line array are all set to be transparent areas, and the rest areas on the detection screen are opaque.
Further, the detection screen is glued on the backlight plate; the backlight plate is a square plate. The utility model can be applied to the detection of optical parameters of the fundus camera, including the detection of the visual field, the magnification and the resolution of the fundus camera. The using method of the utility model is as follows: the present invention was placed at a position 1m in front of the fundus camera, and the mechanical axis of the apparatus and the optical axis of the fundus camera were made coaxial. Different scales on the utility model are shot by a fundus camera, then the imaged data are read, and the view field, magnification and resolution of the fundus camera can be calculated according to the geometrical relationship.
The utility model integrates the field scale, the magnification scale and the resolution line arrays of different fields, can realize that the eye ground camera can detect three parameters of field, magnification and resolution by 1 time of shooting, and greatly simplifies the detection process.
Drawings
FIG. 1 is a schematic view of an optical parameter detection device for a fundus camera according to the present invention;
FIG. 2 is a schematic view of a resolution line array according to the present invention;
FIG. 3 is a schematic view of the detection light path of the present invention;
the system comprises a backlight plate 1, a detection screen 2, a field of view 3, a scale with magnification, a resolution line array 4, an optical parameter detection device 5 and a fundus camera 6.
Detailed Description
The utility model is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the optical parameter detection device for a fundus camera of the present embodiment includes a backlight plate 1 and a detection screen 2, the size of the backlight plate 1 is larger than that of the detection screen 2, and the detection screen 2 is fixed on the backlight plate 1 by a fixing method including, but not limited to, gluing.
The radius of the detection screen 2 is larger than 41.5cm (the radius of the detection screen 2 needs to be larger than 41.5cm, because most of the eyeground cameras 6 have a viewing field of about 45 degrees, the radius of the detection screen 2 limits the detection range of the viewing field, and the radius larger than 41.5cm can at least cover 45-degree viewing field detection, while the circular plate with the radius of 44.5cm is selected in the embodiment (the shape of the detection screen 2 can also be set to be a square plate), and the viewing field, the magnification scale 3 and the resolution line array 4 are integrated.
The backlight plate 1 emits uniform white light to provide a light source for the detection screen 2, and in this embodiment, the backlight plate 1 is a square plate with a thickness of 1m × 1m and a thickness of 0.1 m.
As shown in fig. 1, the view field and the magnification scale 3 are integrated into four scale lines, which are x-axis, y-axis, x 'axis and y' axis scale lines, wherein the included angle between the x 'axis and the positive direction of the x axis is 45 °, and the included angle between the y' axis and the positive direction of the x axis is 135 °. The nodical central point for detecting screen 2 of four scale marks, the biggest scale of scale want to be greater than 41.5cm, and every check 1mm, and the biggest scale of this scale is 44cm in this implementation, every check 1mm, every 10mm identification number, if appear overlapping then do not mark.
As shown in fig. 2, the resolution line array 4 is formed by 4 line groups, where the number of lines in each group is an odd number greater than 3 (in this embodiment, 21 lines are used for each resolution line array 4), the lines in the a group of line groups are parallel to the x axis, the lines in the b group of line groups are parallel to the y axis, the included angle between the lines in the c group of line groups and the y axis is 45 °, the included angle between the lines in the d group of line groups and the x axis is 45 °, and the line width and the line interval are the same.
The line width is determined by the requirements of international YY0634-2008 (fully: YY0634-2008 ophthalmology instrument: fundus camera) and the magnification of the fundus camera, when the international YY0634-2008 requires that the full field of view of the fundus camera is more than 30 degrees, the resolution at the center of the field of view is more than 60lp/mm, the resolution at the middle of the field of view is more than 40lp/mm, the resolution at the edge of the field of view is more than 25lp/mm, according to the formula:
wherein, P is resolution, and the numerical values are respectively 60, 40 and 25 lp/mm; gamma is the design value of the magnification of the fundus camera; firstly, the resolution line widths at the center, middle and edge of the field of view can be calculated as d respectively by using the formula (1)1、d2And d3。
Next, let the total field of view of the fundus camera be 2 α (let the theoretical design value of the total field of view of the fundus camera be 2 α), and let d be1The resolution line array 4 with the width is placed at the scale mark 0, and the number of the resolution line array is 1; c is mixing the above d2The resolution line array 4 of width is placed on the scale lines x-axis, x '-axis, y-axis and y' -axis
The number of the positions is 8; c is mixing the above d3The resolution line array 4 of width is placed at (1000 × tan α) mm positions on the x-axis, x '-axis, y-axis and y' -axis of the scale line, and the number is 8.
In summary, the above-mentioned steps complete the structural design and the determination of the placement position of the resolution line array 4 of the optical parameter detection apparatus of the present embodiment.
Note: above-mentioned visual field, magnification scale 3 and resolution ratio lines array 4 all set up to logical light zone, and all the other regions do not lead to light (visual field, magnification scale 3 and 4 fretwork designs of resolution ratio lines array are light-permeable when detecting promptly, are white, and other positions are black on the detection screen 2).
In detecting the optical parameters of the fundus camera 6 (as shown in fig. 3) with the present embodiment in practice, the optical parameter detecting device 5 of the present embodiment is placed at the exit pupil 1m of the fundus camera 6 with the optical axis of the fundus camera 6 and the mechanical axis of the optical parameter detecting device 5 coaxial, according to the formula (2):
wherein θ is the actual half field of view of the fundus camera; h is the maximum scale value in the readable field of view and magnification scale 3 in the shot image.
The full field of view 2 θ of the fundus camera 6 can be calculated from the formula (2).
The length L of the reading scale 100mm on the image taken by the fundus camera 6 (the number of pixels that the reading scale 100mm occupies on the image taken by the fundus camera 6, the product of this number of pixels and the size of pixels is the actual length L of the scale 100mm imaged on the fundus camera 6, the actual magnification of the fundus camera 6 can be calculated from L/100 mm), and the magnification of the fundus camera 6 can be calculated from L/100 mm.
Whether the resolution of the fundus camera 6 meets the requirements of the national standard YY0634-2008 can be determined according to whether the captured image can distinguish the resolution line arrays 4 at different fields of view on the detection screen 2 (that is, whether the lines on the resolution line arrays 4 at the center, middle and edge of the field of view on the captured image can be clearly seen, if so, the requirements are met).
The above description is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (6)
1. An optical parameter detection device for an eye fundus camera is characterized by comprising a backlight plate and a detection screen on the backlight plate, wherein the backlight plate provides a light source for the detection screen, and the size of the backlight plate is larger than or equal to that of the detection screen;
the radius of the detection screen is larger than 41.5cm, and the detection screen integrates a view field, a magnification scale and a resolution line array; the view field and magnification scale comprises scale marks of an x axis, a y axis, an x 'axis and a y' axis, wherein the included angle between the x 'axis and the positive direction of the x axis is 45 degrees, and the included angle between the y' axis and the positive direction of the x axis is 135 degrees; the maximum scale on the scale marks is larger than 41.5cm, and each grid of the scale marks is set to be 1mm and comprises 100mm scales;
the resolution line array comprises 4 line groups, and resolution line arrays with different line widths are respectively arranged at the positions of the center of the field of view, the middle of the field of view and the edge of the field of view of the fundus camera, which correspond to the field of view and the scale with magnification.
2. An optical parameter sensing device for a fundus camera according to claim 1, wherein the number of lines of each of said line groups is an odd number greater than 3, the lines of the a-group line group are parallel to the x-axis, the lines of the b-group line group are parallel to the y-axis, the included angle between the lines of the c-group line group and the y-axis is 45 °, the included angle between the lines of the d-group line group and the x-axis is 45 °, and the line width and line interval of each group are the same.
3. An optical parameter sensing device for a fundus camera according to claim 2, wherein the optical parameter sensing device is in use placed at the exit pupil 1m of the fundus camera with the optical axis of the fundus camera and the mechanical axis of the optical parameter sensing device being co-axial.
4. An optical parameter sensing device for a fundus camera according to claim 3, wherein the positions of the center of the field of view, the middle of the field of view and the edge of the field of view of said fundus camera corresponding to said field of view, respectively, on the magnification scale are determined by the design values of the full field of view of said fundus camera;
the line width of the resolution line array is determined by the design value of the magnification of the fundus camera and the lowest resolution in the international YY0634-2008 for the center of the field of view, the middle of the field of view and the edge of the field of view of the fundus camera, respectively.
5. An optical parameter sensing device for a fundus camera according to any one of claims 1 to 4, wherein the field of view, the magnification scale and the resolution line array are provided as transparent areas, the remainder of the screen being opaque.
6. An optical parameter sensing device for a fundus camera according to any one of claims 1 to 4, wherein said screen is glued to a backlight; the backlight plate is a square plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120533215.5U CN215374437U (en) | 2021-03-15 | 2021-03-15 | Optical parameter detection device for fundus camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120533215.5U CN215374437U (en) | 2021-03-15 | 2021-03-15 | Optical parameter detection device for fundus camera |
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| CN215374437U true CN215374437U (en) | 2021-12-31 |
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| CN202120533215.5U Active CN215374437U (en) | 2021-03-15 | 2021-03-15 | Optical parameter detection device for fundus camera |
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Effective date of registration: 20220718 Address after: 210000 room 273, No. 1, Tianzuo Road, Xingcheng, Xigang street, Qixia District, Nanjing, Jiangsu Province Patentee after: Nanjing Visual Medical Technology Co.,Ltd. Address before: 221005 room 208, building F, ruishang Longhu modern business industrial park, 255 Zhongshan North Road, Gulou District, Xuzhou City, Jiangsu Province Patentee before: Xuzhou Huiyou Medical Technology Co.,Ltd. |