KR101374173B1 - Lensmeter for vertex distance adjustable and vertex distance adjust method - Google Patents

Abstract

The present invention relates to a lens meter for adjusting vertex distance which automatically adjusts a position of a lens supporter through VD measurement and a vertex distance adjusting method, wherein the lens meter comprises: a distance measuring unit which measures a distance from a measurement target lens; a control unit calculating a VD value based on distance measured from the distance measuring unit, comparing the calculated VD value with a predetermined VD value, and controlling a lens supporter movement so as to match the calculated value on the basis of difference with the determined VD value; and a position movement unit moving the lens supporter corresponding to the control by the control unit so as to match the calculated VD value with the determined VD value, and therefore a position of the lens supporter can be automatically adjusted by VD measurement and accurate measurement can be made regardless of lens shape and state. [Reference numerals] (110) Distance measuring unit; (120) Vertex distance input unit; (130) Control unit; (140) Display unit; (150) Position movement unit; (160) Storage unit

Description

Lens meter and vertex distance adjustable method

The present invention relates to a lens meter and a method for adjusting the distance between the vertex distance (VD), and more particularly, the distance between the vertex distance to automatically adjust the position of the lens supporter (Lens Supporter) through the VD measurement is possible. It relates to a lens meter and a method for adjusting the distance between vertices.

Lenses used in eyeglasses correct the vision of a person by changing an optical path of a beam incident to the human eye and forming an image on the retina. Therefore, in order to correct the vision, a lens suitable for the corrected vision of the person who wants to use the glasses should be selected. At this time, a lens meter (Lensmeter) is used to measure the optical characteristics of the lens for corrected vision. In general, a lens meter measures optical characteristics of a lens such as spherical power, cylindrical power, and cylindrical axis.

A general technique for a lens meter is shown in FIG.

As shown in FIG. 1, a general lens meter includes an LED 11 as a light source, an objective lens 12 for converting light generated by the LED 11 into parallel light, an aperture 13, and a macro. An image sensor 16 for capturing an image through the microlens 14, the pinhole lens 15 for image formation, and the pinhole lens 15, storing the image through an electrical signal, and continuously digitally processing the image. Receiving a digital image output from the image sensor 16, the image processing, the microcontrol unit (MCU) (17) and the refractive power output from the microcontrol unit 17 to calculate and output the refractive power through the calculation It is composed of an indicator 18 for displaying on the screen.

Here, the micro control unit 17 sets the distance between the vertices VD to a fixed value when calculating lens information such as refractive power, and calculates lens information.

In order to measure refractive power and the like using such a lens meter, the lens to be measured is placed on a lens supporter and the value of the lens is measured. Here, the lens supporters vary in shape and vary in length.

The lens meter as described above determines the precision and reliability depending on how well the optical axis is made.

The diopter D, which is a unit for indicating the refractive power of the lens, is expressed by the inverse of the focal length. This refractive power causes a difference in refractive power when the VD is changed.

For example, looking at the difference in refractive power according to the change in the distance between the vertices shown in FIG. 2, when the focal length L1 is directly in contact with the lens meter, the lens distance is 121.95 mm and is measured as + 8.2D. However, if the VD moves 28.88mm away from the lens meter, the distance from the focal point F is 97.07mm (121.95-28.88), so the diopter value is 10.74D, which is 1000mm / 93.07. As such, when the VD value is changed by 28.88mm, the difference of 2.54D value occurs.

Therefore, the VD value becomes a very important factor in the measurement of refractive power.

Another conventional technology for a lens meter is disclosed in the following Patent Document 1, Korean Patent Publication No. 10-2008-0099409 (published November 13, 2008).

The disclosed <Patent Document 1> is a first light source for emitting a parallel beam to the lens to be measured; A second light source which emits a diffusing beam to the lens under measurement; A beam splitter for combining the beams emitted from the first light source and the second light source to guide the beam to a lens under measurement; An aperture plate for dividing the beam passing through the lens under measurement into a plurality of signal lights; And a detector for detecting an image distribution of the divided signal light.

The conventional lens meter configured as described above improves the optical system structure of the lens meter, thereby improving the measurement function of the lens meter and at the same time providing a lens meter that is structurally simple, efficient and easy to manufacture.

Republic of Korea Patent Publication No. 10-2008-0099409 (published November 13, 2008)

However, the above-described general technology and the prior art put the lens to be measured on the lens supporter to measure the value of the lens. In the case of the lens supporter, the shape is diverse and the length is minutely different so that accurate refractive power measurement is impossible. there was.

In addition, when the lens mounted on the lens supporter is attached to the glasses or other instruments, it is difficult to determine the correct VD value, there was also a disadvantage in lacking accuracy in the refractive power measurement.

An object of the present invention is to solve the problems caused in the prior art as described above, a lens meter and a method for adjusting the distance between the vertices to automatically adjust the position of the lens supporter (Lens Supporter) through the VD measurement method To provide.

It is another object of the present invention to provide a lens meter and a method for adjusting the distance between the vertices, which can adjust the distance between the vertices to make precise measurements regardless of the shape of the lens and the situation of the lens.

Another object of the present invention is to automatically move the lens supporter of the lens meter to a set value, thereby providing a lens meter and a method for adjusting the distance between vertices to improve the accuracy and to facilitate the convenience of use. will be.

In order to achieve the object as described above, the lens meter capable of adjusting the distance between the vertices according to the present invention includes a distance measuring unit for measuring the distance to the measurement target lens; The VD value is calculated based on the distance value measured by the distance measuring unit, the calculated VD value is compared with the preset VD value, and the movement of the lens supporter so that the VD value calculated according to the difference coincides with the set VD value. Control unit for controlling the; And a position shifting unit which moves the lens supporter under the control of the controller to match the calculated VD value with the set VD value.

The distance measuring unit may be installed at both sides of the lens supporter, and include first and second distance detecting sensors measuring a distance from the lens to be measured.

The controller may compare the sensing distances of the first distance sensor and the second distance sensor, and generate a correction display signal for correcting the lens position if they do not match.

The controller may calculate and output a refractive power when the calculated VD value and the set VD value coincide with each other.

Wherein the position moving unit is characterized in that for adjusting the VD value by lifting the lens supporter under the control of the controller.

In order to achieve the above object, the lens meter capable of adjusting the distance between the vertices according to the present invention displays a calibration display signal output from the controller, and adjusts the position shift value so that the user can manually adjust the lens supporter. It further comprises a display unit for displaying on the screen.

In order to achieve the above object, the lens meter capable of adjusting the distance between the vertices according to the present invention is characterized in that it further comprises a vertex distance input unit for inputting the VD value to the controller.

In order to achieve the above object, the method of adjusting the distance between vertices according to the present invention comprises the steps of: (a) receiving a reference VD value; (b) measuring a distance to the measurement target lens using a distance measuring sensor, calculating a VD value based on the measured distance value, and setting a measured VD value; (c) comparing the measured VD value with the reference VD value, and if not, operating the distance measuring sensor and moving the lens supporter to match the measured VD value with the reference VD value.

In the step (c), when the measured VD value and the reference VD value do not coincide, the lens supporter is lifted to match the measured VD value and the reference VD value.

In order to achieve the above object, the method for adjusting the distance between vertices according to the present invention (d) compares the measured VD value and the reference VD value, calculates refractive power, and displays the calculated refractive power on the screen. It further comprises a step.

According to the present invention, there is an advantage of automatically adjusting the position of the lens supporter through the VD measurement.

In addition, according to the present invention there is an advantage that the accuracy of the refractive power calculation by adjusting the exact VD value.

In addition, according to the present invention there is an advantage to provide a lens meter capable of precise measurement regardless of the shape of the lens and the lens conditions.

In addition, according to the present invention, by automatically moving the lens supporter of the lens meter to a set value, there is an advantage that it is convenient in use while improving accuracy.

1 is an optical system configuration diagram of a typical lens meter,
2 is an explanatory diagram for explaining a difference in refractive power according to a change in a conventional VD value;
3 is a sectional view of a lens supporter to which the present invention is applied;
4 is a block diagram showing the configuration of a lens meter capable of adjusting the distance between the vertices in accordance with a preferred embodiment of the present invention,
5 is a flowchart illustrating a method for adjusting the distance between vertices according to an exemplary embodiment of the present invention.

Hereinafter, a lens meter and a method for adjusting a distance between vertices according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram showing the configuration of a lens meter capable of adjusting the distance between the vertices according to an embodiment of the present invention, the distance measuring unit 110, the vertex distance input unit 120, the controller 130, the display unit 140, The position moving unit 150 and the storage unit 160 are included.

The distance measuring unit 110 measures a distance from the lens 101 to be measured. The distance measuring unit 110 includes first and second distance detecting sensors 111 installed at both sides of the lens supporter 102 of FIG. 3 and measuring distances from the lens 101 to be measured. The first and second distance detection sensors 111 may use an optical sensor that detects the distance using ordinary light, an ultrasonic sensor that detects the distance by using ultrasonic waves, and the like.

The vertex distance input unit 120 serves to input the VD value to the controller 130. This VD value is for a user to input a reference VD value in advance.

The controller 130 calculates a VD value based on the distance value measured by the distance measuring unit 110, compares the calculated VD value with a preset VD value (reference VD value), and calculates the difference according to the difference. It serves to control the movement of the lens supporter 102 so that the VD value matches the set VD value. The controller 130 compares the sensing distances of the first distance sensor 111 and the second distance sensor 111 and displays a correction display signal for correcting the lens position if they do not match. Occurs on). In addition, the controller 130 calculates the refractive power and outputs the refractive power to the display unit 140 when the calculated VD value coincides with the set VD value.

The display unit 140 displays the calibration display signal output from the control unit 130 and serves to display the position shift value on the screen so that the user can manually adjust the lens supporter 102.

The position moving unit 150 moves the lens supporter 102 under the control of the controller 130 to match the calculated VD value with the set VD value. The position moving unit 150 may raise or lower the lens supporter 102 by using a moving device made of a motor, a cylinder, or the like, or elevate the lens supporter 102 by rotating a screw or the like.

The storage unit 160 stores a movement control table for moving the lens supporter or a program for calculating the VD or calculating the refractive power in the controller 130.

Referring to Figures 3 and 4 attached to the operation of the lens meter capable of adjusting the distance between the vertices according to the present invention configured as described above are as follows.

First, as shown in FIG. 3, in a state where the measurement target lens 101 is placed on the lens supporter 102, the controller 130 may include the first and second distance detection sensors that are the distance measuring unit 110. 111 is operated to measure the distance to the lens 101 to be measured.

When the distance from the measurement target lens 101 is measured, the controller 130 compares the first sensing distance measured by the first distance sensing sensor with the second sensing distance measured by the second distance sensing sensor and checks whether the distance is the same. When the first detection distance and the second detection distance do not coincide with each other as a result of the checking, a correction display signal for correcting the lens position is generated and displayed on the display unit 140.

According to the calibration indication signal, the inspector places the measurement object lens 101 on the lens supporter 102 again correctly. Here, in order to correct the position of the lens 101 to be measured, the controller 130 displays the height difference obtained by comparing the first sensing distance with the second sensing distance as a numerical value, so that the user refers to the measurement target lens ( 101) can be calibrated. For example, a numerical value of the height of the left (first detection distance) and the height of the right (second detection distance) is displayed in numerical values, so that the inspector can correctly correct the measurement target lens 101 with reference thereto.

On the contrary, when the first sensing distance and the second sensing distance coincide, the VD value is calculated using either the measured first sensing distance or the second sensing distance. The calculated VD value is called a measured VD value.

In addition, the inspector inputs the VD value as a reference through the vertex distance input unit 120 at the beginning of the inspection. The input VD value is called a set VD value or a reference VD value.

 The controller 130 compares the measured VD value with the set VD value, and if it does not match, transmits a movement control signal for moving the lens supporter 102 to the position moving unit 150 according to the difference value. The movement control signal is a signal that determines whether to raise or lower the lens supporter 102 according to whether the difference value is + or-.

The position shifter 150 raises or lowers the lens supporter 102 according to the movement control signal transmitted. At this time, it is preferable to move up or down finely.

When the lens supporter 102 starts to move by the position shifter 150, the distance measurer 110 measures the distance from the lens 101 to be measured and the controller 130 simultaneously with the movement of the lens supporter 102. Real time updates the measured VD value based on the measured distance value in real time. In addition, the updated measurement VD value and the set VD value are continuously compared in real time. When the measured VD value and the set VD value coincide, the movement of the lens supporter 102 is stopped.

Through this process, the VD value is accurately set, and then the controller 130 calculates the refractive power based on the VD value. The refractive power calculation is performed in the same manner as the conventional method. In addition, the calculated refractive power is displayed through the display unit 140 to allow the inspector to recognize the lens measurement value.

That is, the present invention can accurately set the VD value through the automatic movement of the position of the lens supporter, it is possible to always calculate the refractive power accurately, thereby improving the precision in lens measurement.

5 is a method for adjusting the distance between vertices (a) receiving a reference VD value (S101); (b) measuring the distance to the measurement target lens using the distance measuring sensor, calculating a VD value based on the measured distance value, and setting the measured VD value (S102 to S103); (c) comparing the measured VD value and the reference VD value and operating a distance measuring sensor if they do not match, and moving the lens supporter to match the measured VD value and the reference VD value (S104 to S107); (d) comparing the measured VD value with the reference VD value and calculating the refractive power, and displaying the calculated refractive power on the screen (S108 to S109).

In step (c), when the measured VD value and the reference VD value do not coincide, it is preferable that the lens supporter is lifted to match the measured VD value and the reference VD value.

First, in step S101, the VD value as a reference is input through the vertex distance input unit 120 at the initial stage of the inspection. The input VD value is called a set VD value or a reference VD value.

Next, in a state where the measurement target lens 101 is placed on the lens supporter 102 in step S102, the controller 130 operates the first and second distance detection sensors 111, which are the distance measuring unit 110. The distance to the measurement target lens 101 is measured.

When the distance from the measurement target lens 101 is measured, the controller 130 compares the first sensing distance measured by the first distance sensing sensor with the second sensing distance measured by the second distance sensing sensor and checks whether the distance is the same. When the first detection distance and the second detection distance do not coincide with each other as a result of the checking, a correction display signal for correcting the lens position is generated and displayed on the display unit 140.

According to the calibration indication signal, the inspector places the measurement object lens 101 on the lens supporter 102 again correctly. Here, in order to correct the position of the lens 101 to be measured, the controller 130 displays the height difference obtained by comparing the first sensing distance with the second sensing distance as a numerical value, so that the user refers to the measurement target lens ( 101) can be calibrated. For example, a numerical value of the height of the left (first detection distance) and the height of the right (second detection distance) is displayed in numerical values, so that the inspector can correctly correct the measurement target lens 101 with reference thereto.

On the contrary, when the first sensing distance and the second sensing distance coincide, the VD value is calculated using either the first sensing distance or the second sensing distance measured in step S103. The calculated VD value is called a measured VD value.

Next, in step S104, the controller 130 compares the measured VD value with the set VD value, and if it does not match, moves to step S105 to operate the distance measuring sensor, and moves to step S106 to set the measured VD value The movement control signal for moving the lens supporter 102 is transmitted to the position moving unit 150 according to the difference value from the VD value. The movement control signal is a signal that determines whether to raise or lower the lens supporter 102 according to whether the difference value is + or-.

The position shifter 150 raises or lowers the lens supporter 102 according to the movement control signal transmitted. At this time, it is preferable to move up or down finely.

In this case, as in step S107, the controller 130 may display the VD adjustment value. Based on the displayed VD adjustment value, the inspector may manually adjust the lens supporter to accurately set the VD value.

On the other hand, when the movement of the lens supporter 102 starts by the position shifting part 150, it moves to step S102, and the distance measuring part 110 is moved with the measurement object lens 101 simultaneously with the movement of the lens supporter 102. After measuring the distance, the controller 130 updates the measured VD value in real time based on the measured distance value in real time. In addition, the updated measurement VD value and the set VD value are continuously compared in real time. When the measured VD value and the set VD value coincide, the movement of the lens supporter 102 is stopped.

Through this process, the VD value is set correctly, and then the controller 130 moves to step S108 to calculate the refractive power based on the VD value. The refractive power calculation is performed in the same manner as the conventional method. In addition, the calculated refractive power is displayed through the display unit 140 to allow the inspector to recognize the lens measurement value.

As a result of the comparison in step S104, if the measured VD value and the set VD value coincide with each other, the process moves directly to step S108 without calculating the lens supporter to calculate the refractive power.

That is, the present invention can accurately set the VD value through the automatic movement of the position of the lens supporter, it is possible to always calculate the refractive power accurately, thereby improving the precision in lens measurement.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

The present invention is applied to a technique for measuring a lens. In particular, it is applied to the technique of automatically setting the VD value in the lens meter and measuring the lens.

110: distance measuring unit
120: vertex distance input unit
130:
140:
150: position moving unit

Claims (10)

A distance measuring unit measuring a distance from the lens to be measured;
The VD value is calculated based on the distance value measured by the distance measuring unit, the calculated VD value is compared with the preset VD value, and the movement of the lens supporter so that the VD value calculated according to the difference coincides with the set VD value. Control unit for controlling the; And
And a position shifter for moving the lens supporter under the control of the controller to match the calculated VD value with the set VD value.
The method of claim 1, wherein the distance measuring unit is provided on both sides of the lens supporter, it is possible to adjust the distance between the vertices, characterized in that it comprises a first distance sensor and a second distance sensor for measuring the distance to the measurement target lens Lens meter.
The vertex of claim 2, wherein the controller compares the sensing distances of the first distance sensor and the second distance sensor, and generates a correction display signal for correcting the lens position if they do not match. Lens meter with adjustable distance.
The lens meter of claim 1, wherein the controller calculates and outputs refractive power when the calculated VD value and the set VD value coincide with each other.
The lens meter of claim 1, wherein the position shifter adjusts the VD value by elevating the lens supporter under the control of the controller.
The apparatus of claim 1, further comprising a display unit configured to display a calibration display signal output from the controller on the screen and to display a position shift value on the screen so that the user can manually adjust the lens supporter. Lens meter available.
The lens meter of claim 1, further comprising a vertex distance input unit configured to input a reference VD value to the controller.
(a) receiving a reference VD value;
(b) measuring a distance to the measurement target lens using a distance measuring sensor, calculating a VD value based on the measured distance value, and setting a measured VD value;
(c) comparing the measured VD value with the reference VD value, and if not, operating the distance measuring sensor and moving the lens supporter to match the measured VD value with the reference VD value. How to adjust the distance.
The method of claim 8, wherein in step (c), when the measured VD value and the reference VD value do not coincide, the lens supporter is lifted to match the measured VD value and the reference VD value.
The method of claim 8, further comprising: (d) calculating the refractive power and displaying the calculated refractive power on the screen when the measured VD value and the reference VD value are matched with each other.

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