JP3069320B2 - Automatic lens meter - Google Patents

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 optical characteristics of a lens, and more particularly to a lens meter suitable for measuring an addition.

[0002]

2. Description of the Related Art A lens capable of projecting measurement light onto a test lens, detecting the locus of the measurement light transmitted through the test lens by a light receiving element, and obtaining optical characteristics of the test lens based on the detection result. Meters are known. This lens meter usually has an addition measurement mode, and measures the addition of a progressive multifocal lens or the like.

According to this apparatus, after measuring and storing the distance portion of the lens to be inspected, the mode is switched to the addition measurement mode, the lens is moved from the measurement position, and it is determined that the examiner has reached the near portion. The measured value at the determined position is stored, and the addition is calculated and displayed from the difference.

[0004]

However, in the apparatus described above, the positions of the distance portion and the near portion are left to the subjective judgment of the measurer, and the accuracy of the judgment is determined by the measurer. It depended on intuition and experience. Usually, a mark is attached to each position of the distance portion and the near portion of the lens before the framing, so that accurate measurement can be performed according to the mark, but the mark is easily erased. Furthermore, these marks are wiped off by the lens after the frame is inserted, making it difficult to visually recognize the hidden marks. Therefore, there is a problem that a measurer needs considerable skill for accurate measurement, and there is no objective material for ensuring the accuracy.

An object of the present invention is to provide a lens meter which can easily measure an addition without depending on the skill of a measurer.

[0006]

The present invention is characterized by having the following configuration in order to achieve the above object.

(1) In an automatic lens meter for projecting measuring light to a lens to be measured, detecting the measuring light transmitted through the lens to be measured by a light receiving element , and measuring the optical characteristics of the lens to be measured, a progressive lens measuring mode is set. and mode switching means for switching, a display that performs prescribed displaying the optical axis and the sample lens of the measurement optical system for aligning and measuring means for continuously measuring the optical properties at predetermined intervals, the progressive Les
The optical characteristics to be the moving target are determined according to the stage of the lens measurement.
Setting means , based on the optical characteristics serving as the moving target and the measurement result by the measuring means , the measurement position is set as the moving target.
A calculating means for calculating a relative position against, when displaying the moving target indicating a target to move the lens into a progressive lens shapes and the progressive lens shape of the image of the distance portion and the progressive zone
In both cases, a measurement point mark is displayed based on the calculation means .
And having a display control means of the display that.

(2) In the automatic lens meter of (1), the measuring means obtains the measurement position based on the prism value in the left-right direction at the time of measuring the distance portion.

[0009] In the automatic lens meter (3) (2), said computing means <br/> when the test lens has an astigmatic power is characterized by correcting the astigmatism component.

[0010]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [Configuration] (External Configuration Diagram) FIG. 1 is an external view of the lens meter of the present embodiment.

Reference numeral 1 denotes a display, which displays a reticle indicating the optical axis of the measurement optical system, a cross target for positioning, a measurement result, and the like in a normal measurement mode. FIG. 1 shows a display in the additional power measurement mode, which will be described later in detail. 2 is a print switch for printing the measurement results,
Reference numeral 3 denotes left and right selection switches, and 4 denotes a switch for reading a measured value. Reference numeral 5 denotes a progressive lens measurement switch for switching the measurement mode for progressive lens measurement.

Reference numeral 6 denotes a lens holder, which mounts the lens L to be measured on the nosepiece 7 and holds the lens holder 6.
Is lowered and the lens L to be inspected is held. Reference numeral 8 denotes a backing plate, which moves toward the front in the figure by pressing the frame.

(Refractive power measuring system) Next, an example of the measuring optical system of the lens meter will be described with reference to the optical system layout diagram of FIG.

Reference numeral 11 denotes a light emitting diode such as an LED.
Four are arranged near the focal point of the objective lens 12 orthogonally to the optical axis. When the lens L to be inspected is set on the nosepiece 7, an LED is issued according to an instruction from the microcomputer.
The driver operates and the four LEDs (a, b, c, d) are sequentially turned on. The LEDs a to d are sequentially turned on while the test lens L having refractive power is placed on the nosepiece 7.
It is performed repeatedly at predetermined time intervals.

Reference numeral 13 denotes a measuring target plate having orthogonal slits, which is fixedly disposed near the focal points of the objective lens 12 and the collimating lens 14. If the lens L has a power (refractive power) other than 0D, the four target images are blurred and the image positions are shifted by an amount proportional to the power, causing a measurement error. It is desirable to move the target plate so as to reduce the amount of displacement.

The nosepiece 7 is arranged near the focal points of the collimating lens 14 and the imaging lens 15.
Reference numeral 16 denotes a half prism, and 17 denotes two one-dimensional image sensors which are provided orthogonal to the optical axis and are arranged so that the detection directions are orthogonal to each other.

The light from the LED 11 forms an image on two orthogonal image sensors 17 via an objective lens 12, a collimating lens 14, a test lens L, and an imaging lens 15.

The relationship between the refractive power of the lens to be inspected and the imaging position of the measurement target will be briefly described.

The target 13 is individually illuminated by four LEDs, but when there is no lens to be inspected and when a 0D lens is mounted on the nosepiece 7, the LEDs a, b, c, d are used. Is an image sensor 17
All target images that can be formed on top of each other overlap.

When the lens L has only a spherical refractive power, the position of the target image formed on the image sensor 17 moves on the image sensor 17 by an amount corresponding to the spherical refractive power.

When the lens L to be tested has only a cylindrical refractive power, the light beam incident on the cylindrical lens has a refractive power in a direction orthogonal to (or in the same direction as) the main radial line. The columnar refractive power can be calculated from the movement amount of the target image.

Now, when the LEDs a, b, c, and d are turned on, the center of the target image is A (x
_{a, y a), B (} x b, y b), C (x c, y c), D (x d,
y _d )

[0023]

(Equation 1)

[0024]

(Equation 2)

[0025]

(Equation 3)

[0026]

(Equation 4) After all,

[0027]

(Equation 5)

[0028]

(Equation 6)

[0029]

(Equation 7)

[0030]

(Equation 8) Becomes

The microcomputer 25 described later substitutes the center coordinates of the target image of each LED into the above-mentioned equation to calculate the spherical refraction, the column refraction, the axis angle, and the prism amount (see FIG. 4). -When the get plate is moved, it is corrected by the amount of movement.)

(Control Circuit) FIG. 3 is a block diagram showing a main control circuit of the present apparatus.

The signals from the two image sensors 17 are CCD
Through a driving circuit 21, a comparator 22 and a peak hole
Input to the field circuit 23. The peak voltage detected and input to the peak hold circuit 23 is converted into a digital signal by the A / D converter 24 and then input to the micro computer 25. The digital signal of the peak voltage output from the peak hold circuit 23 is supplied to the computer 25.
The signal is converted by the D / A converter 26 into a voltage signal of 1/2 of the peak voltage, and inputted to the comparator 22. This signal is compared with the signal directly input to the comparator 22 to generate a strobe signal. In response to the strobe signal, the signal of the counter 27 enters the latch 28, and the position of the light-dark edge is read from the waveform at that time, and the microcomputer
The coordinate position is detected by the data 25, and the optical characteristics of the lens to be measured are calculated based on the detection result.

These information are stored in the microcomputer 2
5 via the display control circuit 29,
Characters and graphics are displayed on the display 1 together with the information stored in the device. [Operation] The operation of the lens meter configured as described above will be described.

First, the measurement mode of the single focus lens will be briefly described. Spherical power, astigmatic power of a single focus lens,
In the mode for measuring the astigmatic axis angle, the display 1 displays a reticle centered on a point indicating the measurement optical axis. The sequential lighting of the LEDs a to d is repeatedly performed at predetermined time intervals, and the refractive power is continuously measured. When the test lens L is placed on the nosepiece 7, the refractive power of the test lens L is calculated and displayed on the display 1, and the optical axis of the test lens L and the measuring light are measured from the prism value. Obtain the amount of displacement from the lens to be measured on the axis (Prentice's equation). The display control circuit 29 superimposes the cross target on the reticle of the display 1 and displays the cross target at a position corresponding to the shift amount. When the reticle and the cross target have a predetermined positional relationship, the measured value is the measured value of the lens to be inspected.

Next, the measurement mode of the framed progressive multifocal lens will be described.

The progressive lens measuring switch 5 is pressed to enter the progressive multifocal lens measurement mode. In a state where the test lens is not mounted, the screen of the display 1 includes two curves 30 simulating a progressive portion (band) fixedly displayed and a measurement point as shown in FIG. The vertically long rectangular target 31 shown is displayed. Press the left / right selection switch 3 to specify the left and right sides of the lens to be measured, and the lower side of the frame (in this specification, the upper and lower sides of the frame and the lens mean the upper and lower sides with the spectacles on). The lens to be inspected is placed on the nosepiece 7 in a state where the lens is brought into contact with the frame holder 8. The lens to be inspected is placed on the nosepiece 7 slightly above the center from the center, and the step of measuring the distance portion is started.

The marker 32 flashes slightly below the center of the display 1. The marker 32 indicates the target of movement of the target 31, and the position of the target 31 with respect to the marker 32 informs the measurer of the direction (and the amount of movement) of the lens to be moved. Since the distance portion of the progressive multifocal lens exists on the above-mentioned reference vertical axis, the marker 32 displayed first indicates the position on this reference vertical axis (FIG. 4B).

When the distance measurement step is started and measurement data is obtained, it is determined whether the distance portion is a low-power lens. The obtained refraction value (S, C, A) is expressed by X-
Decomposed into each component of the Y coordinate, and X + Sin ² which is the X component
A lens in which θ or S + Ccos ² θ as a Y component is equal to or smaller than a predetermined value (0.75D in this embodiment) is determined to be a low-power lens.

(A) When it is determined that the lens is not a low-power lens When it is determined that the lens is not a low-power lens, the target 31 is displayed at the position determined as follows.

If the lens to be inspected is a spherical lens, the direction and amount of deviation from the reference vertical axis can be obtained based on the prism values in the left and right directions at each measurement point, so that the target 31 is a marker. It is displayed at a position indicating the relative position of each measurement point with respect to 32.

When the test lens is an astigmatism lens, the position where the prism becomes 0 in the left-right direction of the test lens is on the astigmatism axis. Therefore, the influence of the astigmatism lens is offset from the prism value at each measurement point. Then, correction is made to values indicating the amount of deviation from the reference vertical axis and the direction of deviation (since a spherical lens is considered to be a special astigmatic lens with C = 0, all progressive lenses can be processed in this manner).

Now, in any astigmatic lens having each value of S, C, and A, any point A (x) of the XY coordinates (the optical axis of the lens is set to 0 and the reference vertical axis is set to the Y axis). , Y)
The amount of prism (Px, Py) at is: Px =-(Dxx.x + Dxy.y) Py =-(Dyx.x + Dyy.y) The amount of prism (Px0, Py0) at point B (0, y) is Px0 =- Dxy · y Py0 = −Dyy · y where Dxx = S + Csin ² θ Dyx = −Csin θ · cos θ (= Dxy) Dyy = S + Ccos ² θ C is a minus reading. From the above equation, Px0 = Dxy · (Py · Dxx−Px · Dyx) / (Dxx · D
yy−Dyx · Dxy), so that Px0 is offset from Px and x =
The position of 0 and the display position of the target are determined. This offset calculation is still performed for monitoring the lens position.

The measurer moves the lens to be inspected to align the target 31 with the marker 32 (FIG. 4c), and stores the refractive power a at the position where the coincidence signal is obtained.

When the target 31 matches the marker 32, a horizontally long rectangular target 33 is displayed above the marker 32 in place of the target 31 (d in FIG. 4).
Move the measuring point to the upper side of the lens and mark the target 33
Adjust to the mosquito 32 (e in FIG. 4). In this case, the movement of the target 33 is performed when the test lens moves a predetermined distance (several mm) converted from the prism value in the vertical direction of the lens.
Control is performed so as to match the marker 32. The refractive power b at the position where the matching signal is obtained is stored.

By comparing the stored spherical powers of the refractive powers a and b, it is determined whether the current measurement point is in the progressive portion or in the vicinity of the distance portion after the progressive portion. When the difference between the two spherical powers is within a predetermined range (= approximately 0), it is determined that the measurement point is in the vicinity of the distance portion. It is possible).

(A) -1 When it is determined that the measurement point is near the distance portion.

In this case, the marker 32 is displayed above the target 33 (FIG. 5A). This marker 32 is
It is merely for indicating the moving direction of the get 33. As the target 33 moves toward the marker 32,
The measurer moves the test lens to the near side. The refractive power is continuously measured during the movement, and the microcomputer 2
Reference numeral 5 converts the moving distance from the amount of prism of the lens, and detects a change in addition per unit moving amount. When it is detected that the measurement position has entered the progressive portion from the addition change per unit movement amount, the target 33 changes its shape into a round target 34, and the target 33 is positioned below the round target 34. The marker 32 is displayed (b in FIG. 5). Note that a position where the value increases by a certain amount (for example, 0.12D) from the value of the spherical power of the refractive power b may be detected.

The distance from the addition start position to the distance portion varies depending on the type of progressive lens and the addition power, and is not constant.
With respect to progressive lenses currently on the market, the upper side of the addition start position by a few mm (4 to 8 mm) corresponds to the distance portion area specified by each lens manufacturer. When the movement distance is converted from the amount of the prism measured in the vertical direction of the lens and the lens is moved a predetermined distance (6 mm in this embodiment), the target 34 and the marker 32 are displayed in agreement. In the present embodiment, focusing on the fact that the distance portion is indicated by an area having a certain area, in order to simplify the processing, to move a fixed distance from the measurement point detected as the progressive portion, The movement may be based on a position that is increased by a fixed amount from the value of the spherical power of the refractive power b. When a signal indicating that the lens has moved a predetermined distance is obtained,
The mosquito 32 changes its shape to a cross-shaped marker 35 to notify that they match (FIG. 5c). The microcomputer 25 detects that the measured value at the distance measuring point has stabilized, and stores the measured value in the microcomputer 25.

When the microcomputer 25 confirms that the measured value of the distance portion has been stored, the microcomputer 25 automatically shifts to the near portion measurement step (d in FIG. 5). By automatically shifting from the distance portion measurement step to the near portion measurement step, the displacement of the lens to be inspected due to the switch operation is eliminated. 3
Reference numeral 6 denotes a target for the near portion measurement step. The near portion is measured by moving the target 36 upward from the far portion measurement point (the measurement point is moved below the lens). The movement of the target 36 is performed by converting the change in the amount of prism in the vertical direction of the lens into the amount of movement, but the movement of the target 36 causes the measurement point to be imaged as proceeding through the progressive portion.

While moving the progressive section, the apparatus performs continuous measurement, displays the measured addition on the display section 37, and also displays this on the bar graph 38. This allows the examiner to know the approximate degree of addition and the state of the change even before the near vision measurement is completed.

Further, the apparatus detects the difference between the column surface power at the measurement position and the column surface power at the distance portion, and numerically displays the difference on the display unit 39 as an optical distortion amount. 0.25D) is monitored. If the amount exceeds the predetermined reference amount, the measured value for determining the addition is canceled and the deviation from the direction is obtained by the prism value in the left and right direction of the lens, and the position is deviated from the progressive portion. -Display the get 36 (FIG. 5e,
f). As described above, for a measurement error in a lens having a small refractive power, the change (whether or not to increase) in the amount of optical distortion due to the movement of the lens by the operator (obtained from data such as the change in the amount of prism) is measured. Corrected to the standard. Further, the same processing is performed on a lens whose prism change is disturbed.

In this manner, the measurement is performed up to the lower side of the spectacle frame. When the target 36 is located substantially at the center between the left and right sides, the measurement of the near portion is completed (g in FIG. 5).

The change in the addition power near the near portion is not constant but becomes gradual. Therefore, the measured value of the position where the change in the addition degree per unit movement amount is equal to or less than a certain amount (although the absolute addition amount may be indicated, but the change rate relative to the maximum addition change amount has higher accuracy) The distance from the eye point is shown in the display of the lens maker, but the distance from the distance part falls within the range of about 18 mm to 25 mm. The distance from the progressive start point is set. May be)
Is rounded in 0.25D units (the power unit of the present progressive lens is 0.25D), is estimated as a near portion power, and is within a predetermined range of the estimated near power and ± (in this embodiment, ± 0.
When the measurement value of 05D) is obtained, the measurement ends. In this way, the near power (addition power) can be automatically obtained.

(B) -2 When it is determined that the measurement point is in the progressive portion.

In this case, the target 33 is the marker 3
The measurement point is displayed above the lens 2 (FIG. 6A), and the target 33 is moved in the direction of the marker 32 by moving the measurement point to the upper side of the lens. The marker 32 merely indicates the moving direction of the target 33. The instrument measures the refractive power continuously,
The movement distance is converted based on the prism amount of the lens, and a change in addition per unit movement amount is detected. A position where the change in addition per unit movement amount is equal to or less than a predetermined value (0.03 D / mm in the embodiment) is determined as a position where the progressive portion has been removed, and a measuring point is a predetermined distance (about 2 mm) from this position. When it detects that it has moved and entered the distance section, the marker 32 becomes a cross-shaped marker 35.
The shape is changed to inform that they match (FIG. 6B). The microcomputer 25 detects that the measured value at the distance measuring point has stabilized, and stores the measured value in the microcomputer 25. After storing the measured value at the distance portion measurement point, the near portion measurement is performed in the same manner as (a).

(B) When it is determined that the lens is a low-power lens: In the case of a low-power lens, the basic measurement step is (a).
Therefore, the differences will be mainly described below.

Similarly to (a), the position of x = 0 and the display position of the target are determined by offsetting Px0 from Px, but with a low power lens, a slight deviation from the reference vertical axis is far. since the Yodo number of measurement accuracy is not affected much, when an X component S + C sin ² theta is less than 0.75D unlike the (b) data - which lowers the moving speed of the target. This is because the influence of an error in the processing accuracy in manufacturing tends to be large. When S + Ccos ² θ exceeds 0.75D, the process returns to the step (A). S +
When Ccos ² θ is 0.75D or less, the process is performed in the next step.

The following processing can be performed instead of the method of lowering the target moving sensitivity as described above. The position where the prism is near 0 and the value of which is the minimum from the change in the cylinder value may be set as the position on the reference vertical axis.

The measurer moves the lens to be inspected to align the target 31 with the marker 32 (FIG. 4c), and stores the refractive power a and the prism amount Pa at the position where the coincidence signal is obtained. .

When the target 31 matches the marker 32, a horizontally long rectangular target 33 is displayed below the marker 32 in place of the target 31 (FIG. 5A).
The measurement point is moved to the lower side of the lens to search for a point at which the addition is increased by a predetermined amount from the refractive power a. When this point is detected, the difference between the measured prism amount Pb and the prism amount Pa at this position is determined, and the unit amount of prism change is determined.

Next, the marker 32 is displayed below the horizontally long rectangular target 33. Connect target 33 to marker 3
2 to move the measurement point toward the upper side of the lens. During this time, the apparatus performs continuous measurement, calculates the amount of change in the lens power with respect to the change in the amount of prism, and obtains the addition change per unit amount of change in prism. In a low-power lens, the measurement error greatly affects the measurement of the addition change per unit movement amount as shown in (a). Therefore, the addition change per unit prism change amount is determined by the distance section. Index.

By the way, since the prism change is small where the power change is small, it is impossible to reach the distance portion by the method of making judgments in steps. By the way, the addition degree near the addition start point does not increase in a linear function but gradually increases in the lens design. Therefore, focusing on the feature of the addition power change, it is determined from the change in the addition power per unit prism change amount whether or not the position is a position sufficiently close to the addition start point. This position is a position where a little additional power remains, and the power step of the progressive lens is determined (0.25D step) as described above, so that the distance power of the lens to be inspected is at that position. It can be estimated that the value is rounded in the negative direction from the frequency in 0.25D units. That is,
If it is + 0.35D, the distance portion predicts + 0.25D.

When the predicted value of the distance portion is obtained, the measurement point is further advanced in the direction of the distance portion. The lens power obtained at each measurement point is compared with the predicted value, and when the difference between the two comes within a predetermined range (± 0.06D in this embodiment), the mark is obtained.
The mosquito 32 changes its shape to a cross-shaped marker 35 to notify that the measurement point is located at the distance section (FIG. 5c). The refractive power at the distance section is stored.

Thereafter, the procedure automatically shifts from the distance measuring section to the near measuring step. The operation of the near portion measurement step is almost the same as in the case of (a). However, when the y component of the measured refractive power is smaller than a predetermined amount (0.75 D or less), the movement amount of the target is determined based on the increase amount of the addition power.

The above-described method for obtaining the distance portion of the low-power lens can be used for general lenses, even if the lens is not a low-power lens. It can also be used to determine the distance portion of the lens.

[0067]

Embodiment 2 The configuration of Embodiment 2 is different from that of Embodiment 1 in that
A feature is that a position detecting mechanism for the lens to be inspected is added, and the display position of the target 33 is determined using the detection result. Since the refractive power measuring system itself is the same as that of the second embodiment, its description is omitted.

FIG. 7 is a sectional view of the mechanism for detecting the position of the lens to be inspected, and FIG. 8 is a sectional view taken along line AA of FIG.

Reference numeral 8 denotes a backing plate for pressing a frame (in the figure, the lens L is simply placed), and 41 denotes a guide pin. Reference numeral 42 denotes a rack, which is held in the internal space of the backing plate 8 so as to be movable horizontally and horizontally, and a guide pin 41 is fixed to the rack 42. A coil spring 43 biases the guide pin 41 leftward (upward in FIG. 7). The rack 44 is supported so as to be movable in the front-rear direction of the apparatus.
Since the backing plate 8 is fixed to 4, the backing plate 8 is movable in the front-rear direction with respect to the apparatus. Reference numeral 45 denotes a spring that constantly biases the backing plate 8 forward.

A pinion 47 attached to a rotatable rotating shaft 46 meshes with the rack 42, and the pinion 47 moves in the front-rear direction integrally with the rack 44. The amount of rotation of the pinion 47 is transmitted to the gear 48 via the rotation shaft 46. The amount of rotation of the gear 48 is detected by a potentiometer 49. A pinion 50 meshes with the rack 44,
The rotation amount of the pinion 50 is detected by the potentiometer 51. These signals are processed and input to a microcomputer. By moving the lens L while making contact with the abutment plate 8 and the guide pin 41 in this manner, the amount of movement of the lens L is detected, and the target and marker display positions are detected based on the detected information. Is determined.

In the first embodiment, the change in the amount of prism is converted into the movement distance of the lens to be measured (measurement point). In the second embodiment, since the amount of movement of the lens to be inspected can be directly detected, the detected value can be used to determine the display position of the target.

In contrast to the first embodiment, the apparatus according to the second embodiment can accurately detect the amount of movement of the lens to be inspected. Therefore, when the measurement point deviates from the progressive portion, it can accurately determine whether the measurement point has deviated to the left or right. The target can be moved in proportion to the amount of movement of the lens to be inspected (especially useful for measuring a cylindrical lens). In addition, since the position of the near portion can be determined with high accuracy by displaying the distance from the far portion, the addition can be accurately obtained.

In the above embodiment, various transformations can be performed, and only the positional relationship between the target and the marker is displayed without providing two curves simulating a progressive portion (band). Alternatively, the progressive portion (band) may be moved with respect to the target. Thus, the examples are not intended to limit the embodiments of the present invention.

[0074]

According to the present invention, the addition can be easily measured without depending on the skill level of the measurer.

[Brief description of the drawings]

FIG. 1 is an external view of an apparatus of the present embodiment.

FIG. 2 is an optical layout diagram showing a measurement optical system.

FIG. 3 is a block diagram showing a control method of the apparatus.

FIG. 4 is an explanatory diagram showing a display on a screen of a display 1;

FIG. 5 is an explanatory diagram showing another mode of the display of the screen of the display 1.

FIG. 6 is an explanatory diagram showing still another mode of the display on the screen of the display 1.

FIG. 7 is a cross-sectional view showing a mechanism for detecting a position of a backing plate and a guide pin.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

[Explanation of symbols]

 1 Display 5 Progressive Lens Measurement Switch 25 Microcomputer 31, 33, 34, 36 Target 32, 35 Marker 37 Display 38 Bar Graph

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁷ , DB name) G01M 11/00-11/02 Practical file (PATOLIS) Patent file (PATOLIS)

Claims (3)

(57) [Claims] 1. An automatic lens meter for projecting measurement light onto a test lens, detecting the measurement light transmitted through the test lens with a light receiving element , and measuring the optical characteristics of the test lens, switching to a progressive lens measurement mode. and mode switching means, a display for displaying predetermined to align the optical axis and the sample lens of the measurement optical system, a measuring means for continuously measuring the optical properties at predetermined intervals, progressive lens Measurement
Setting that determines the optical characteristics to be the moving target according to a certain stage
Means, and a measurement position corresponding to the movement target based on the optical characteristics to be the movement target and the measurement result by the measurement means.
Calculating means and the lens in the progressive lens shapes and the progressive lens shape of the image of the distance portion and the progressive corridor to determine the relative position
And displays a moving target indicating a target to move,
Automatic lens meter, characterized in that and a display control unit of the display for displaying the measurement point mark on the basis of the calculation means. 2. The automatic lens meter according to claim 1, wherein
An automatic lens meter according to claim 1, wherein said calculating means obtains said measurement position based on a prism value in the left-right direction at the time of measuring a distance portion. 3. The automatic lens meter according to claim 2, wherein
Automatic lensmeter said calculation means, characterized in that to correct the astigmatism component when the test lens has an astigmatic power.