JP2551989B2 - Lens meter and method for measuring progressive multifocal lens by the lens meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a near-distance power of a progressive multifocal lens with a frame without a hidden mark and a mark sheet provided by a manufacturer, and a progressive multifocal lens with unclear features. The present invention relates to a lens meter capable of accurate and quick measurement and a method of measuring a progressive multifocal lens by the lens meter.

(Prior Art) Conventionally, there is a seamless progressive multifocal lens for presbyopia correction, but this progressive multifocal lens has a complicated distance zone portion, a near vision portion and a progressive zone portion between them. Since it is composed of spherical surfaces continuously, it is not possible to know the distance portion and the near portion from the outside like a bifocal lens, and therefore the lens maker delivers a circular uncut lens to the eyeglass store. Various marks on the lens, such as distance mark, near mark,
A mark indicating the geometric center and the optical center, a hidden mark, etc. are provided, and when measuring the spherical power in the distance portion with the lens meter, for example, the distance portion mark is aligned with the measurement optical axis of the lens meter, and the near portion is used. In the case of measuring the spherical power in, the near-distance portion mark is aligned with the measurement optical axis of the lens meter.

By the way, it may be necessary to measure a framed progressive multifocal lens (also referred to as a spectacle lens) that has been ground around the uncut lens and placed in a spectacle frame. Of the various marks that have been ground on the uncut lens, some of them, including the distance part mark and the near part mark, have not been erased and the progressive multifocal lens with frame has a Since it is not symmetrical, it is difficult to distinguish the distance portion and the near portion from the appearance.

Therefore, conventionally, each manufacturer prepares a lens mark sheet in advance, and the eyeglass store measures the distance portion and the near portion based on the hidden mark and the lens mark sheet, but all the mark sheets of each manufacturer It is not always prepared at an eyeglass store, and even if it is prepared, its management is difficult, and it is not only difficult to search for the hidden mark itself, but also it is necessary to search and find the lens mark sheet with frame progressive There is a problem that the work of sticking to the multifocal lens and measuring is troublesome.

(Problems to be Solved by the Invention) Therefore, as disclosed in Japanese Patent Laid-Open No. 61-200441, a distance diopter is obtained by shifting from the optical center of a progressive multifocal lens with a frame by a dimension designated by each lens manufacturer. ,
Although a measuring method of measuring the near dioptric power has been proposed, this measuring method has a problem that the far dioptric power and the near dioptric power cannot be measured unless the kind of the progressive multifocal lens is known in advance.

There is also a lens meter for detecting image distortion as disclosed in Japanese Patent Laid-Open No. 54-14757, but this one does not measure the near dioptric power closely related to the distance dioptric power. .

An object of the present invention is to provide a lens meter which does not require a hidden mark, a lens mark sheet provided by a manufacturer, and can accurately and quickly measure its near dioptric power even with a progressive multifocal lens whose feature is not clear. To provide a method of measuring a progressive multifocal lens according to the present invention.

(Means for Solving the Problem) In order to achieve the above-mentioned object, a lens meter according to the present invention has a spherical diopter, a cylindrical diopter, and a spherical diopter as a distance dioptric power measured in a distance dioptric power part of a progressive multifocal lens. A storage means for storing the axial angle, and it is determined whether or not the cylindrical power or the axial angle is changed by comparing the cylindrical power or the axial angle stored in the storage means with the cylindrical power or the axial angle of the part measuring the axial angle. And at least one of the cylindrical power and the axial angle is changed, and a display means for displaying that the deviation from the progressive band portion is displayed.

In order to achieve the above-mentioned object, the structure of the method for measuring a progressive multifocal lens by a lens meter according to the present invention has a distance portion of a progressive multifocal lens having a progressive zone between a distance portion and a near portion. Including the step of setting on the lens table so that its vicinity is aligned with the measurement optical axis, and confirming that there is no change in the cylindrical power and the axial angle by moving the progressive multifocal lens slightly with respect to the measurement optical axis. While the storage step of measuring and storing the spherical power, the cylindrical power and the axial angle in the distance portion, the progressive multifocal lens is moved to measure the spherical power, the cylindrical power and the axial angle, and the spherical power and the cylindrical power are measured. And a discriminating step of discriminating by means of discriminating means whether or not at least one of the cylinder power and the shaft angle of the shaft angle has changed, and based on that at least one of the cylinder power and the shaft angle has changed. Then, it is confirmed that the measurement optical axis deviates from the progressive zone portion while observing the display means, and a measuring step of measuring the spherical power or addition power as the near dioptric power of the progressive power multifocal lens, Characterize.

(Operation) According to the present invention, after the distance dioptric power is measured, when the progressive multifocal lens is moved in the direction in which the near vision portion is present, when the progressive multifocal lens deviates from the progressive zone portion, the measurement optical axis of the lens meter is displayed by the display means. Since it is displayed that it is out of the progressive zone, it is possible to check the position of the near portion while looking at the display means,
The near dioptric power can be easily measured.

(Example) Hereinafter, a case where an embodiment of a lens meter according to the present invention and a method of measuring a progressive multifocal lens by the same is applied to an auto lens meter will be described with reference to the drawings.

As shown in FIG. 5, in the case of the progressive power multifocal lens 1, the addition diopter (from the distance zone 2 to the near zone 3 including the distance zone 2 and the near zone 3) is added ( Although there is a change in the spherical power S), there is basically no change in the cylindrical power C and the axial angle A. In the area 5 indicated by the diagonal lines, incorrect distortion appears and the astigmatic component appears in the measurement. When the measurement is performed in the region 5, there is a property that the cylindrical power C and the axial angle A are changed. The method for measuring a progressive multifocal lens by the lens meter of the present invention is based on the essential characteristics of the progressive multifocal lens. The near dioptric power is measured by the following.
The measuring method will be described with reference to FIG.

First, as shown in FIG. 3, a progressive multifocal lens 6 as a lens to be inspected is placed on a lens receiver 10 of a lens meter, and its frame 8 is brought into contact with a lens table 7 (step in FIG. 1). See S1).

Then, the lens table 7 is moved back and forth so that the distance portion 2 is located substantially on the measurement optical axis 11 of the lens meter, and this lens is moved left and right (in the direction of the arrow) to obtain spherical power S, cylindrical power C, While confirming that the axial angle A does not change, the spherical power S and the cylindrical power C as the distance dioptric power and the axial angle A are measured by the calculation measuring means 12 (see FIG. 2) (see step S2 in FIG. 1). The spherical power S, the cylindrical power C, and the axial angle A are stored in the memory 13 (see step S3 in FIG. 1), and are displayed on the monitor 14 serving as display means through the interface 15.

Next, as shown in FIG. 4, the vicinity of the near portion 3 is measured optical axis.
The lens table 7 is moved so as to be right above 11 (see step S4 in FIG. 1), and the spherical power S, the cylindrical power C, and the axial angle A in the near portion 3 are measured by the calculation and measurement means 12, and the distance is measured. Cylinder power C, axial angle A and near portion 3 in the portion 2
The cylinder degree C and the axis angle A in (3) are discriminated by the discriminating means which constitutes a part of the arithmetic measuring means 12.

Here, when a change occurs in the cylindrical power C in the distance portion 2, the cylindrical power C in the near portion 3 and the axial angle A with respect to the axial angle A, the spherical power S and the cylindrical power displayed on the monitor 14 are displayed. The diopter C and the axis angle A are displayed in a blinking manner, and the measurer observes whether or not the spherical diopter S is blinking (see step S5 in FIG. 1) and the near diopter in the near portion 3 The spherical power S (addition power ADD) is measured.

When located in the shaded area 5 shown in FIG. 5, the spherical power S blinks. Therefore, the process moves to step S6, and the lens table 7 is moved in the vicinity of the near vision part 3 to move the spectacle frame 8 left and right. Swing, and the spectacle frame 8 is set again at a place where the spherical power S does not blink. Then, the lens table 7 is moved in the front-rear direction while swinging the spectacle frame 8 left and right so that the spherical power S does not blink, and a portion where the spherical power S changes little is searched for. The difference between the spherical power S in the near portion 3 and the spherical power S in the distance portion 2 is stored in the memory 11 as the addition power (ADD) and the monitor 1
2 is displayed (see steps S7 and S8 in FIG. 1).

As described above, in the embodiment, the value of the spherical power S is displayed in a blinking manner when the region 5 is the measurement target, but the present invention is not limited to this.

Further, when the progressive multifocal lens 6 is moved from the distance portion 2 to the near portion 3 and the border of blinking addition power ADD is marked at any time by a conventionally known marking finger, It is possible to visually check the distribution of the progressive zone portion 4.

Further, in the embodiments, only the frame-added progressive multifocal lens has been described, but the lens meter according to the present invention can be applied to the measurement of an uncut lens as in the past, and a progressive multifocal lens having a prism thinning process. It can also be applied to focusing lenses.

(Effect) According to the lens meter and the method for measuring a progressive multifocal lens according to the present invention, even a progressive multifocal lens which does not require a hidden mark or a lens mark sheet provided by a manufacturer and has no obvious features There is an effect that the near dioptric power can be measured accurately and quickly.

[Brief description of drawings]

FIG. 1 is a flow chart of a lens meter according to the present invention and a method for measuring a progressive multifocal lens by the same, FIG. 2 is a block diagram showing a schematic configuration of the lens meter according to the present invention, and FIGS. FIG. 5 is a plan view showing a state in which a progressive multifocal lens according to the present invention is set on a lens table, and FIG. 5 is an explanatory diagram for explaining properties of the progressive multifocal lens according to the present invention. 2 ... Distance portion, 3 ... Near portion, 4 ... Progressive zone portion, 6 ...
Progressive multifocal lens, 7 ... Lens table, 11 ... Measuring optical axis, 12 ... Computational measuring means, 13 ... Memory (storage means), 14 ... Monitor (display means)

Claims (2)

(57) [Claims] 1. A storage unit for storing a spherical power, a cylindrical power and an axial angle as a distance power measured in a distance portion of a progressive power multifocal lens, and a cylindrical power or an axial angle stored in the storage unit. Based on that at least one of the cylinder power and the axis angle has changed, and a determination means that determines whether the cylinder power or the axis angle has changed in comparison with the cylinder power or the axis angle of the site being measured. A lens meter, comprising: at least a display unit for displaying a deviation from the progressive zone. 2. A setting step of setting the vicinity, including the distance portion of a progressive power multifocal lens having a progressive zone between the distance portion and the near portion, on the lens table in alignment with the measurement optical axis. A memory for measuring and storing the spherical diopter, the cylindrical diopter and the axial angle in the distance portion while confirming that the cylindrical diopter and the axial angle do not change by moving the progressive multifocal lens slightly with respect to the measurement optical axis. And a step of moving the progressive multifocal lens to measure a spherical power, a cylindrical power and an axial angle, and whether at least one of the spherical power, the cylindrical power and the axial angle of the cylindrical power and the axial angle has changed. A discriminating step of discriminating by means of discriminating means, and confirming that the measuring optical axis has deviated from the progressive zone based on a change in at least one of the cylindrical power and the axial angle, by observing the display means, Progressive Measurement method for a progressive multifocal lens according to the lens meter of the measuring step of measuring a spherical power or diopter as near power focus lens, in that it consists characterized.