CN-122004736-A - Manual adjustment sighting mark adapting and adjusting force measuring device and measuring method

CN122004736ACN 122004736 ACN122004736 ACN 122004736ACN-122004736-A

Abstract

The invention relates to a manually-adjusted optotype adapting and adjusting force measuring device and a measuring method. The lens component adopts a coaxial structure of a front fixed convex lens, a rear fixed convex lens and a middle sliding concave lens, and the equivalent diopter is adjusted through the movable middle concave lens. The device also integrates a displacement detection unit, acquires lens displacement in real time and converts the lens displacement into diopter output through a data processing module. The invention realizes wide-range simulation of the sighting target distance and accurate measurement of the adjusting force, and has the advantages of compact structure, high linear adjusting precision, convenient operation and the like.

Inventors

WANG NINGLI
NIU ZHIXIN
LI DONGYANG
JIANG SHUAI
ZHANG YIN
He Anjie

Assignees

河南省医学科学院

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. Manually adjustable optotype adaptation and adjustment force measuring device, characterized by comprising: A base extending in the front-rear direction; the lens assembly comprises a front convex lens and a rear convex lens which are fixed at two ends of the base, and a middle concave lens which is assembled on the base in a sliding way, wherein the middle concave lens is positioned between the front convex lens and the rear convex lens, and the front convex lens, the rear convex lens and the middle concave lens are arranged in an extending way along the same optical axis, and the equivalent diopter of the lens assembly can be adjusted when the middle concave lens moves on the base; The adjusting mechanism is used for driving the concave lens to reciprocate along the front-back direction and comprises a rough adjusting unit and a fine adjusting unit, wherein the rough adjusting unit is connected between the concave lens and the base and is used for rapidly positioning, and the fine adjusting unit is used for accurately focusing; and the displacement detection unit is in signal connection with the concave lens so as to acquire displacement data of the concave lens in the extending direction of the optical axis in real time.
2. The manually adjusted optotype adapting and adjusting force measuring device of claim 1, further comprising: a guide rail fixed on the base, on which racks extending in the front-rear direction are arranged; the sliding seat is assembled on the guide rail in a guiding way, and an output gear meshed with the rack is arranged on the sliding seat; The coarse tuning unit and the fine tuning unit are arranged on the slide carriage, wherein The coarse adjustment unit comprises a coarse adjustment gear meshed with the output gear, and one end of the coarse adjustment gear is connected with a coarse adjustment hand wheel; The fine tuning unit comprises an input gear, one end of the fine tuning gear is connected with a fine tuning hand wheel, and the fine tuning gear and the output gear are in meshed transmission through an intermediate reduction gear.
3. The manually adjusted optotype adapting and adjusting force measuring device of claim 1, wherein, Further comprises: The guide rail is fixed on the base, and is provided with a rack extending along the front-back direction and a friction rail arranged on at least one side of the rack and extending in the same direction; the sliding seat is assembled on the guide rail in a guiding way, and a swing bracket with a teeterboard structure is arranged on the sliding seat; the coarse adjustment unit comprises a coarse adjustment gear rotatably assembled at one end of the swing bracket and used for being meshed with the rack; the fine adjustment unit comprises a friction roller rotationally assembled at the other end of the swing bracket and used for rolling friction with the friction rail; The swing bracket is provided with a rough adjusting position which swings forward to mesh the rough adjusting gear with the rack and separate the friction roller from the friction rail when driven, and a fine adjusting position which swings reversely to separate the rough adjusting gear from the rack and contact the friction roller with the friction rail; The sliding seat is provided with a locking structure which is matched with the swinging bracket to limit the swinging bracket to a rough adjusting position and a fine adjusting position.
4. A manually adjustable optotype adapting and adjusting force measuring device according to claim 3, characterized in that the locking structure comprises an elastic closing-in arranged on the slide, which is arranged on the swinging path of the input shaft of the coarse adjusting gear and/or the input shaft of the friction roller and is arranged corresponding to the coarse adjusting position and the fine adjusting position of the swinging bracket, so that when the swinging bracket enters the coarse adjusting position and the fine adjusting position, the corresponding input shaft is pressed into the elastic closing-in to realize locking.
5. The manually adjustable optotype adapting and adjusting force measuring device according to claim 4, wherein the slide base is provided with an arc-shaped long hole for the input shaft of the friction roller to pass through, the extending path of the arc-shaped long hole is consistent with the swinging path of the input shaft of the friction roller, and the elastic closing-in is arranged at two ends of the arc-shaped long hole, and the openings are oppositely arranged.
6. The manually adjustable visual target adapting and adjusting force measuring device according to claim 5, wherein the elastic closing-in comprises an arc-shaped elastic sheet arranged in the arc-shaped long hole, arc-shaped guide sections are arranged at two ends of the arc-shaped elastic sheet, and openings of the two arc-shaped guide sections are gradually reduced along the direction opposite to the opening.
7. The manually adjusted optotype adapting and adjusting force measuring device of claim 1, wherein the displacement detection unit comprises a fixed grating and a movable grating integrated in an adjusting mechanism, the movable grating moving synchronously with the concave lens.
8. The manually adjusted optotype adapting and adjusting force measuring device according to claim 1, wherein the total length of the optical path of the lens assembly is 120mm, the focal power of the front convex lens and the focal power of the rear convex lens are 4.5D, the focal power of the middle concave lens is-18D, the equivalent diopter adjusting range of the lens assembly is-15D to +5D, the front convex lens adopts a double-gluing achromatic structure of K9 material and ZF2 material, and the middle concave lens adopts a plane concave lens of K9 material.
9. The manually adjusted optotype adapting and adjusting force measuring device of claim 1, further comprising a data processing module in signal connection with the displacement detection unit for converting and outputting corresponding equivalent diopter values based on displacement data.
10. A measuring method based on a manually adjusted optotype adapting and adjusting force measuring device according to any one of claims 1-9, characterized by the steps of: a) Initializing, namely presetting the actual physical distance of the external visual target observed currently, and matching the corresponding target diopter reference value and the target reference position of the concave lens; b) Coarse positioning, namely driving the concave lens to quickly move to the vicinity of the target reference position by an operator until the detected human eyes observe that the external optotype presents a preliminary contour; c) Fine tuning focusing, namely fine tuning the position of the concave lens by an operator until the detected human eyes judge that the external optotype reaches the clearest state; d) Acquiring instantaneous displacement data and converting the instantaneous displacement data into an actual equivalent diopter value; e) And calculating and outputting, namely combining the known distance parameter of the external visual target and the physiological parameter of the tested person, calculating and obtaining and storing the regulating force value.

Description

Manual adjustment sighting mark adapting and adjusting force measuring device and measuring method Technical Field The invention relates to the technical field of optical measurement, in particular to a manually-adjusted sighting mark adapting and adjusting force measuring device and a measuring method. Background In vision testing and clinical diagnosis of eye vision, accurate control and adjustment force measurement of the sighting target distance are key links. Currently, the following significant problems still exist in practical applications for measuring devices commonly used in this field: 1. The traditional device adopts a physical displacement method, namely, a mechanical guide rail drives the optotype card to move, or a tester is required to change the observation position in a physical space. Since human eye accommodation force measurements need to cover a span from a near point (about 10cm-20 cm) to a far point (infinity), the mechanical rail must be of sufficient physical length. This directly results in bulky, the structure of equipment is bloated, and mechanical wear is violent in the in-process of frequent removal optotype, and complex operation. The heavy structure is difficult to adapt to application scenes with high requirements on space and portability, such as basic medical institutions, community screening, portable home detection and the like. 2. The existing optical zoom scheme mostly adopts a double-lens or multi-lens group rotation structure. Limited by the optical combination logic and physical travel limitations of conventional lens groups, their zoom range can typically only cover within + -10D. When facing high myopia (> -10D) or hyperopia crowd, the device can not provide clear optotype simulation due to insufficient zoom range, so that blind areas appear in the adjustment force measurement of the special crowd, and the diagnosis requirement of clinical full crowd coverage can not be met. 3. When the zoom mechanism is manually adjusted, the lens is very easy to deviate or incline relative to the optical axis in the displacement process due to the deviation of the transmission axis and the optical axis in the assembly process or the radial movement of the movable lens seat on the guide rail. This slight decentration can introduce significant astigmatism and coma, resulting in blurring, distortion, and even ghosting of the sighting target image observed by the subject. This not only interferes with subjective judgment of the measured person, but also seriously weakens the accuracy and reliability of the measurement result. 4. Most conventional devices lack accurate quantitative feedback logic, the diopter reading of which often depends on a rough mechanical scale on a slide, or entirely on a subjective record of the subject's spoken response to the subject. In the measuring process, equivalent diopter data corresponding to lens displacement cannot be obtained synchronously in real time, so that hysteresis exists in data acquisition. The excessive dependence on subjective judgment causes larger dispersion of measurement results among different operators, and is difficult to realize standardized and objective clinical evaluation. Disclosure of Invention The invention aims to provide a manually-adjusted sighting target adapting and adjusting force measuring device which is used for solving the technical problems of huge volume, narrow zoom range and low adjusting resolution of the conventional sighting target measuring device, and also aims to provide a measuring method using the measuring device. The manual adjusting sighting mark adapting and adjusting force measuring device has the following technical scheme that: The manually adjusted optotype adapting and adjusting force measuring device comprises: A base extending in the front-rear direction; the lens assembly comprises a front convex lens and a rear convex lens which are fixed at two ends of the base, and a middle concave lens which is assembled on the base in a sliding way, wherein the middle concave lens is positioned between the front convex lens and the rear convex lens, and the front convex lens, the rear convex lens and the middle concave lens are arranged in an extending way along the same optical axis, and the equivalent diopter of the lens assembly can be adjusted when the middle concave lens moves on the base; The adjusting mechanism is used for driving the concave lens to reciprocate along the front-back direction and comprises a rough adjusting unit and a fine adjusting unit, wherein the rough adjusting unit is connected between the concave lens and the base and is used for rapidly positioning, and the fine adjusting unit is used for accurately focusing; and the displacement detection unit is in signal connection with the concave lens so as to acquire displacement data of the concave lens in the extending direction of the optical axis in real time. Further, the method further comprises the following steps: a guid