JP2000136985A - Lens meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable required measurement information to be seen easily, and to improve ease-of-use by changing the screen configuration being displayed on a display according to a measurement mode. SOLUTION: For example, when an L/R mode for specifying the left and right of a lens to be inspected of a single-focus lens, a control part performs initialization and displays a measurement screen on a display 2 via a display circuit when the power of a (L/R mode) lens meter body 1 is turned on. Since an initial screen when the power is turned on is set to a single mode/the measurement mode of single-focus lens, a measuring person pushes a switch 3c for selecting L/R mode to select an L/R mode. When the L/R mode is selected, a lens LE to be inspected is placed on a nose piece 4 for measurement. When the lens to be inspected is placed on a measurement optical axis, the control part calculates refraction force for obtaining the measurement values of S (the degree of spherical surface), C (the degree of astigmatism), A (the angle of astigmatism axis), and a prism. Each lens measurement mode is displayed in a display column.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens meter for measuring an optical characteristic of a test lens.

[0002]

2. Description of the Related Art A lens meter for measuring optical characteristics of a lens to be inspected has a function of selecting a measurement mode depending on a lens type such as a single focus lens or a progressive lens, and a left and right lens such as a lens having a spectacle frame. The left and right designation mode (L / R mode) in which measurement is performed by designating a single mode (S / S
Mode). The measurement screen of this type of lens meter generally has L /
When the R mode is selected, the left and right measurement results can be displayed on the same screen, and the measurement result in the single mode can be obtained by using only the left or right display area.
It was displayed in the same size as in mode.

Further, the size of the display area of the alignment reticle displayed on the measurement screen is the same regardless of the measurement mode.

[0004]

However, L / R
Although the required measurement information (display elements) displayed on the measurement screen differs depending on the measurement mode such as the single mode and the single mode, the same type of measurement information is displayed in the same size with the conventional lens meter. The display area of the screen was not being used effectively. For this reason, there was a drawback in viewability and usability of the measurement information.

Further, in the conventional lens meter, the display color of the measurement information is uniform regardless of the measurement mode and the measurement state, and therefore, it is not always visually easy to understand.

SUMMARY OF THE INVENTION In view of the above prior art, it is an object of the present invention to provide a lens meter which makes necessary measurement information more easily viewable and which is easy to use.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) In a lens meter for measuring an optical characteristic of a lens to be measured, a display means for displaying measurement information necessary for measuring the lens to be measured, and a display means for selecting a lens from among a plurality of measurement modes. Mode selection means for selecting the measurement mode, and display control means for changing the display size of measurement information displayed on the screen of the display means in accordance with the measurement mode selected by the mode selection means. ,
It is characterized by having.

(2) In the lens meter of (1),
The measurement mode selected by the mode selection means is an L for specifying and measuring whether the test lens is for the right eye or the left eye.
/ R mode and a single mode for performing measurement without distinction between left and right, and the display control means displays the measurement information for each of the left and right lenses on the same screen when the L / R mode is selected. When the single mode is selected, the display size of the measurement information to be displayed on the screen is enlarged and displayed when the L / R mode is selected.

(3) In the lens meter of (1),
The measurement mode selected by the mode selecting means is L / L for designating whether the test lens is for the right eye or the left eye.
When the L / R mode is selected, the display control means displays the measurement information for each of the left and right lenses on the same screen, and reduces the display size of one of the left and right designated measurement information to the other. It is characterized in that it is larger than the display size of the measurement information.

(4) In the lens meter of (1),
The measurement information whose display size is made variable by the display control means includes at least one of alignment information for aligning the test lens or a measured value of an optical characteristic of the test lens.

(5) In the lens meter according to any one of (1) to (4), the display control means may further change a display color of the measurement information whose display size is changed to a predetermined display color. Features.

(6) In a lens meter for measuring an optical characteristic of a lens to be measured, a display means for displaying measurement information necessary for measuring the lens to be measured, and the display means according to a measurement state of the lens to be measured. And display control means for changing a part of the display color of the measurement information displayed on the screen.

(7) In the lens meter of (6),
A mode selection unit for selecting an L / R mode for specifying whether the lens to be inspected is for the right eye or the left eye, and the display control unit is configured to select each of the left and right lenses when the L / R mode is selected. Are displayed on the same screen, and the display color of the measurement value for which the left or right is designated is changed to a predetermined display color.

(8) In the lens meter of (6),
Detecting means for detecting an alignment state of the lens to be inspected, wherein the display control means graphically displays a mark for guiding to a desired alignment state on a screen of the display means based on a detection result of the detection means; In addition, the display color of the mark is changed to a predetermined display color according to the alignment state.

[0016]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the appearance of the device of the embodiment.

Reference numeral 1 denotes a lens meter main body. 2 is LCD
And the like, and displays information necessary for measurement such as measurement results and alignment targets. Further, an icon indicating a switch function is displayed at a position corresponding to the switches 3a to 3d of the switch group 3 below the screen of the display 2 at the lower part of the screen. By changing the function assigned to each switch in accordance with each icon display, various commands can be issued with a small number of switches. For example, the switch 3a at the time of measurement is a print switch function for printing out a measurement result, and the switch 3b is a lens type for selecting a measurement mode of a type of a lens to be measured (single focus lens, progressive lens, contact lens). A selection switch function, a switch 3c has an L / R mode selection switch function for selecting a measurement mode whether the test lens is for the right eye or a left eye, and a switch 3d has measurement data stored in the apparatus. A CLEAR switch function for erasing is assigned, and the CLEAR switch also has a measurement mode selection function for returning the L / R mode to the single mode.

Reference numeral 4 denotes a nosepiece on which the lens LE to be measured is placed and which serves as a base point for measurement. Contact lens (CL)
When measuring the nosepiece 4, the attached CL (not shown)
Replace with nosepiece. Reference numeral 5 denotes a lens press, which can be held down to stably hold the lens LE placed on the nosepiece 4.

Reference numeral 6 denotes a lens holder, which is used, for example, when making a reference for Axis (astigmatic axis angle) measurement by contacting the lower part of the frame and stabilizing the lens in a spectacle frame. The lens cradle 6 can be moved in the front-rear direction by using a lens cradle lever 7. Reference numeral 8 denotes a READ switch for reading optical characteristic data of the lens LE to be measured. When the READ switch 8 is pressed, the measured value is displayed on the display 2 as a hold and is stored in a memory inside the apparatus.

FIG. 2 is a diagram showing an optical system and a control system.
Reference numeral 11 denotes four measurement light sources, such as LEDs, which are arranged near the focal point of the objective lens 12 at right angles to the optical axis L, and are sequentially turned on under the control of the control unit 40. Reference numeral 13 denotes a mirror, and 14 denotes a target plate having an orthogonal slit, which is fixed or movable near the focal points of the objective lens 12 and the collimating lens 15. Reference numeral 17 denotes an imaging lens, and the nosepiece 4 includes the collimating lens 15 and the imaging lens 1.
7 are located near the focal point. Reference numeral 18 denotes a mirror, 19 denotes a half prism, and 20 denotes two image sensors provided on a plane orthogonal to the optical axis and arranged so that their detection directions are orthogonal to each other. Reference numeral 21 denotes two cylindrical lenses, and the image sensor 20 is disposed at each strong principal meridian focal position. Light from the measurement light source 11 illuminates the target plate 14 via the objective lens 12. The light beam that has passed through the target plate 14 passes through the collimating lens 15, the lens LE to be inspected, the imaging lens 17, the cylindrical lens 21, and the like.
An image is formed on each of the two image sensors 20.

A method of measuring the optical characteristics of the lens to be measured by using such a measuring optical system will be briefly described. Each measurement light source 11
The target plates 14 are individually illuminated by the sequential lighting of. When there is no lens LE to be inspected, all the target images formed on the image sensor 20 by sequentially turning on the respective measurement light sources 11 overlap. When the test lens LE has only spherical refractive power, the position of the target image on the image sensor 20 moves by an amount corresponding to the spherical power. When the test lens LE has only the columnar refractive power, the parallel light flux incident on the cylindrical lens 21 has a refractive power in a direction (or the same direction) orthogonal to the strong principal meridian. Therefore, the spherical power, the cylindrical power, the astigmatic axis angle, and the prism amount can be known based on the center coordinates of the target image obtained by turning on each measurement light source 11. This calculation is described in
It is basically the same as No. 60-17355.

The output signal from the image sensor 20 is input to the control unit 40, and the control unit 40 performs a predetermined calculation to obtain the optical characteristics of the lens LE. The control unit 40 is connected to the switch group 3, a memory 41 for storing measurement results, and a display circuit 42 for displaying measurement information such as measurement results on the display 2.

The operation of the apparatus having the above configuration will be described. Here, in a single focus lens,
The case where the L / R mode for specifying the left and right of the test lens is selected, the case where the single mode in which the left and right of the test lens are not distinguished is selected, and the case where the display color of the measurement information is made variable will be described separately. .

(L / R Mode) When the power of the lens meter main body 1 is turned on, the control unit 40 initializes and then displays a measurement screen on the display 2 via the display circuit 42. Since the initial screen when the power is turned on is in the single mode / single focus lens measurement mode, the measurer selects the L / R mode by pressing the L / R mode selection switch 3c.

After selecting the L / R mode, the lens LE to be inspected
Is placed on the nosepiece 4 for measurement. For example, it is assumed that a lens in an eyeglass frame is measured. FIG. 3 shows an example of a screen displayed on the display 2 at this time, on which various display elements (measurement information) for measuring the optical characteristics of the lens LE to be measured are displayed. An alignment circle 31 is displayed in the center of the screen, and a display column 30a for displaying the measured value of the right-eye lens is provided on the right side, and a display column 30b for displaying the measured value of the left-eye lens is provided on the left side. . In each display column, S (spherical power), C (astigmatic power), A (astigmatic axis angle), and prism value are displayed. Further, the display of the mark 33 distinguishes the left and right of the currently designated lens. When the mode is first switched from the single mode to the L / R mode, the measurement mode of the right-eye lens is set as shown in FIG. 3, so that the measurer switches the designation of the left and right of the lens as necessary. Each time the switch 3c is pressed, the left and right measurement modes are switched, so that the operator can know the state of the mark 33 depending on where it is displayed.

The measurement will be described. When the test lens is placed on the measurement optical axis, the control unit 40 calculates the refractive power and obtains the measured values of S, C, A, and the prism value. In the case of the right lens measurement mode, it is displayed in the display column 30a. The measurement is continuously performed at predetermined intervals, and the value in the display column is constantly updated and displayed as the measured value changes.

Further, the control unit 40 obtains the deviation amount of the optical center of the lens to be measured from the measurement optical axis from the prism value, and places the alignment target 32 at a position corresponding to the deviation amount with respect to the center of the alignment circle 31. indicate. The measurer moves the lens so that the target 32 overlaps the center of the alignment circle 31. The shape of the display of the target 32 changes depending on the degree of centering. When the deviation amount of the optical center exceeds 0.5Δ (prism diopter), the target 32 is a ring-shaped mark 32a as shown in FIG. Further, when the amount of deviation falls within a predetermined allowable range, the shape changes to a large cross mark 32c (for obtaining the optical characteristics of S, C, and A, the accuracy of the target 32 is sufficient if the shape of the target 32 is at least the cross mark shape). Yes, but if you need to know more or mark a lens, use a crosshair.)

The operator presses the READ switch 8 when the alignment is completed by such a change in the display of the target 32. When the READ switch 8 is pressed, the control unit 40 stores the measurement result of the optical characteristics of the lens LE to be measured in the memory 4.
1 and hold the optical characteristics at that time in the measured value display column 30.

After one of the lenses has been measured, the switch 3c is pressed to switch between the left and right measurement modes.
The other lens is measured in the same procedure. In the L / R mode, the measurement results of the left and right lenses are displayed in display columns 30a and 30b.
Is displayed in the same state.

(Single mode) This measurement mode is performed when the power of the main body 1 is turned on or when the CL
Selection can be made by pressing the EAR switch 3d. When the single mode is selected, the control unit 40 changes the screen design of each display element (each measurement value of the alignment circle 31, the target 32, and the display column 30) necessary for the measurement as shown in FIG. Display size is L /
The screen display of the display 2 is controlled via the display circuit 42 so as to display a larger image than that in the R mode.
In the case of the single mode, there is no need to distinguish between the left and right of the test lens LE, so that only one measurement value display column 30 is required. Therefore, the screen structure of the screen can be spared accordingly,
By changing the screen design, the necessary display elements can be enlarged and displayed.

The measurement in the single mode is also the same as that of L
As in the / R mode, the lens is moved so that the target 32 is aligned with the center of the alignment circle 31. When the completion of the alignment is confirmed by the change in the display of the target 32, the READ switch 8 is pressed. The measurement result is stored in the memory 41 and is held and displayed in the display column 30.

As described above, in the single mode, the display of the information for alignment and the large measured value are displayed, so that it is easy to visually grasp each information. Since the information display for alignment is large, the alignment operation is also facilitated. Further, the display color of the information for alignment and the display value of the measured value can be changed from the surrounding color to make it easier to visually recognize.

In this measurement mode, the display 2 is used to increase the display size of each display element and make it easier to see.
The center position of the alignment circle 31 on the screen and the target 32 corresponding to the center are programmed to be displayed shifted from those in the L / R mode, but this is merely a difference in how to take a reference. Does not affect measurement accuracy.

If there is a restriction on the screen configuration in enlarging each display element, at least S, C, A
It is good to enlarge the measured value of.

The measurement of a single focus lens has been described above as an example. In the measurement of a bifocal lens, a progressive lens, and a contact lens, when the single mode is selected, each display element is enlarged compared to the L / R mode. It is displayed. That is, in addition to the S, C, and A displays, the addition power is greatly displayed in the measurement of the bifocal lens and the progressive lens, and the equivalent sphere value (SE) in the measurement of the contact lens is displayed in S, C, and A. ) Is also enlarged.

The embodiment described above can be variously modified. For example, the measurement values in the left and right measurement value display columns in the L / R mode can have different display sizes. That is, as shown in FIG. 5, when the measurement mode of the right-eye lens is selected, the display size of the left-eye display column 30b is reduced, and the display of each measurement value in the right-eye display column 30a is reduced. Increase the size. In this way, by giving a difference in the size of the display size according to the selection of the left and right measurement modes, it is easy to see at a glance which lens is being measured, which is convenient.

There is also a lens meter provided with a function of automatically judging the left or right of a lens when measuring a lens contained in a frame. In the case where the right-eye lens and the left-eye lens are automatically discriminated in this manner, the display size of the measurement value display column can be made different correspondingly.

When the measurement information displayed on the screen of the display 2 changes the display color in addition to the change in the display size as described above, the necessary information can be more easily viewed. For example, in the L / R mode shown in FIGS. 5 and 3, when the measurement mode of the right-eye lens is selected, the display element 30b for the left eye and other display elements on the screen are different from the normal black display. , The display color of each measurement value in the display field 30a for the right eye is displayed in red which is easy to see visually. And RE
When the AD switch 8 is pressed, the measured values are stored in the memory 41 under the control of the control unit 40, and the display color of each stored measured value is changed from red to blue. Thus, the measurer can easily visually determine whether the lens currently being measured is left or right, and whether the left and right measurements have been completed. These color changes may be determined in advance as a convention.

Furthermore, in addition to the measured values, the alignment information can be more easily understood by changing the display color according to the measurement state. For example, the alignment mark 3 shown in FIG.
2, in the case of the ring-shaped mark 32 a, the black is the same as the alignment circle 31,
The color is changed such as yellow in the case of 2b and red in the case of the large cross mark 32c.

[0040]

As described above, according to the present invention,
The screen configuration displayed on the display is changed according to the measurement mode, and the measurement information necessary for the measurement is easily seen, so that the usability is improved. In addition, since the display color of the measurement information changes according to the measurement state, the necessary measurement information becomes more easily visually recognizable.

[Brief description of the drawings]

FIG. 1 is a schematic view showing the appearance of an apparatus.

FIG. 2 is a diagram showing an optical system and a control system.

FIG. 3 is a diagram illustrating a display state of a display in an L / R mode.

FIG. 4 is a diagram showing a display state of a display in a single mode.

FIG. 5 is a diagram showing a state in which the size of the display size is made different according to the selection of the left and right measurement modes in the L / R mode.

FIG. 6 is a diagram illustrating a change in the shape of a target indicating a shift amount of an optical center.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens meter body 2 Display 3 Switch group 3a Print switch 3b Lens type selection switch 3c L / R mode selection switch 3d CLEAR switch 4 Nosepiece 8 READ switch 32 Alignment mark 40 Control unit 42 Display circuit

Claims (8)

[Claims] 1. A lens meter for measuring an optical characteristic of a lens to be measured, a display means for displaying measurement information necessary for measuring the lens to be measured, and a measuring means suitable for the lens to be measured among a plurality of measurement modes. Mode selection means for selecting a measurement mode, display control means for changing the display size of measurement information displayed on the screen of the display means in accordance with the measurement mode selected by the mode selection means, A lens meter comprising: 2. The lens meter according to claim 1, wherein the measurement mode selected by the mode selection means is an L / R for specifying and measuring whether the test lens is for the right eye or the left eye.
And a single mode for performing measurement without distinction between left and right, and the display control means controls to display the measurement information for each of the left and right lenses on the same screen when the L / R mode is selected. When the single mode is selected, the display size of the measurement information to be displayed on the screen is enlarged and displayed as compared to when the L / R mode is selected. 3. The lens meter according to claim 1, wherein the measurement mode selected by the mode selection means includes an L / R mode for specifying and measuring whether the test lens is for a right eye or a left eye. When the L / R mode is selected, the display control means displays the measurement information for each of the left and right lenses on the same screen, and displays the display size of one of the left and right designated measurement information on the other. A lens meter characterized by being larger than the size. 4. The lens meter according to claim 1, wherein the measurement information whose display size is varied by the display control means is alignment information for aligning the lens to be measured, or a measurement of optical characteristics of the lens to be measured. A lens meter comprising at least one of: 5. The lens meter according to claim 1, wherein the display control means changes the display color of the measurement information whose display size is changed to a predetermined display color. Lens meter. 6. A lens meter for measuring optical characteristics of a lens to be measured, a display means for displaying measurement information necessary for measuring the lens to be measured, and a display means for displaying the measurement information on the lens according to a measurement state of the lens to be measured. A display control means for changing a part of the display color of the measurement information displayed on the screen. 7. The lens meter according to claim 6, wherein L is a value for designating whether the test lens is for the right eye or the left eye.
/ R mode selection means, wherein the display control means displays the measurement value information for each of the left and right lenses on the same screen when the L / R mode is selected, and displays the left and right lenses. Characterized in that the display color of the measured value is changed to a predetermined display color. 8. The lens meter according to claim 6, further comprising detection means for detecting an alignment state of the lens to be inspected, wherein said display control means displays a desired image on a screen of said display means based on a detection result of said detection means. A lens meter for displaying a mark for leading to an alignment state to be performed, and changing the display color of the mark to a predetermined display color in accordance with the alignment state.