JP3226241B2 - 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 measuring lens is projected onto a lens to be measured, and the trajectory of the measuring light transmitted through the lens to be detected is detected by a light receiving element. -Is known. This lens
The camera 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 of the position is stored, and the addition is calculated and displayed from the difference.

[0003]

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. . Further, these marks are wiped off by the lens after the frame is placed, 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.
A first object of the present invention has been devised in view of the above-mentioned drawbacks, and a lens holder capable of performing highly reliable addition measurement even with a progressive lens which has been subjected to special processing called prism thinning. To provide data. A second object of the present invention is to provide a method which does not depend on the skill of a measurer,
An object of the present invention is to provide a lens meter capable of measuring an addition.

[0004]

The present invention has the following features to achieve the above object. (1) A lens meter for projecting measurement light onto a lens to be measured, detecting the locus of the measurement light transmitted through the lens to be measured by a light receiving element, and measuring the optical characteristics of the lens to be measured based on the detection result. Mode to switch to progressive lens measurement mode
Mode switching means, measurement control means for continuously measuring the refraction power at predetermined intervals, and a progressive lens by the mode switching means.
When in the measurement mode, a cumulative
Display graphic figures with areas imitating
Display and the lens under test is assumed to be a spherical lens.
When the amount of prism in the left-right direction is almost zero.
A marker to be moved to a position where
The marker based on the measurement result measured by the control.
A target indicating the current measurement point for the
The first guiding means displayed on a) and the measurement point is in the far vision area
Storage means for storing measurement results at a certain time
Measurement results in the far vision area to move the
And whether the measurement point deviates from the corridor based on the current measurement results
Monitoring means for monitoring whether or not the
When the measurement point deviates from the corridor,
Display on the display that there is a measurement point,
When the point is within the progressive zone, the progressive
A moving mark for moving the belt is displayed on the display.
And second guiding means . (2) In the lens meter of (1), the first lead
The means is based on the amount of prism in the horizontal direction at each measurement point.
To offset the distance and the deviation from the distance axis.
It is characterized by having arithmetic means for obtaining the position direction.

(3) In the lens meter of (1),
The first guiding means may further include the target being connected to a marker.
After that, the far vision marker is displayed at the position indicating the far vision area
And based on the measurement result at each measurement point,
Display the target for the distance section, and invite the user to the distance section area.
Is performed . (4) In the lens meter of (1), the storage means
Is the measuring point based on the continuously measured change in refractive power
Is a far vision area, and based on the result of the determination,
And automatically obtains the measurement result of the distance portion area .

(5) The measuring light is projected on the lens to be measured,
The trajectory of the measuring light transmitted through the inspection lens is detected by the light receiving element
The optical characteristics of the lens under test based on the detection results.
The progressive lens measurement mode
The mode switching means for switching and the refractive power are connected at predetermined intervals.
Measuring control means for continuously measuring and mode switching means;
When in the progressive lens measurement mode, guide the measurement point.
Graphic figure with an area mimicking a corridor
The display that displays
Moving amount detecting means for detecting the moving amount of the lens to be inspected;
When the lens is assumed to be a spherical lens,
The movement target is set to a position corresponding to the position where the
Marker based on the detection result by the movement amount detection means.
A target indicating the current measurement point for the marker.
First guidance means for displaying a list on the display;
A storage device that stores the measurement results when the fixed point is in the distance area
Step and distance to move the measuring point towards the near part
Measurement points based on the measurement results of the part area and the current measurement results
Monitoring means for monitoring whether the vehicle has deviated from the corridor,
Measuring points based on the results of the means and the movement amount detecting means.
Is outside the above-mentioned corridor, there is a measurement point outside the above-mentioned corridor.
Is displayed on the display, and the measurement point is
When it is within the zone, the moving mark that moves in the
Second guidance means for displaying on the display
It is characterized by. (6) The measurement light is projected onto the lens to be measured, and
The trajectory of the measurement light that has passed is detected by the light receiving element, and the detection is performed
A lens that measures the optical characteristics of the test lens based on the results
In the meter, a mode for switching to the progressive lens measurement mode
And means for continuously measuring the refractive power at predetermined intervals.
Measurement control means and the test lens is assumed to be a spherical lens.
Measured at a position where the amount of prism in the
First guiding means for guiding a fixed point, and guiding by the first guiding means
2nd guide which guides a measuring point from the set position to the upper side of the test lens
Means and said link when moved according to said second guiding means.
The distance power is calculated based on the change in the refractive power measured continuously.
A distance power measuring means for obtaining and storing the distance power;
Calculate the difference of the astigmatic power of the fixed point, and the difference of the astigmatic power is within the predetermined range.
Judgment means for judging whether the condition is within and judgment by the second judgment means
Means to indicate that the measuring point has deviated from the progressive part based on the result
After storing the distance reading, the measuring point is moved to the near reading part.
And a monitoring means for moving.

[0007]

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 a lens meter according to the present embodiment. A display 1 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. In FIG.
This shows a display in the additional power measurement mode, which will be described in detail later. Reference numeral 2 denotes a print switch for printing a measurement result, 3 denotes a left / right selection switch, and 4 denotes a switch for reading a measurement 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. The lens L to be measured is placed on a nosepiece 7 and the lens holder 6 is lowered to hold the lens L to be measured. 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 a measuring optical system for a 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, and four light emitting diodes are arranged near the focal point of the objective lens 12 at right angles to the optical axis. When the lens L to be inspected is set on the nosepiece 7, the LED driver operates according to an instruction from the microcomputer, and the four LEDs (a, b, c, d) are sequentially turned on. The sequential lighting of the LEDs a to d is repeatedly performed at predetermined time intervals while the lens L having refractive power is placed on the nosepiece 7. Reference numeral 13 denotes a measurement target plate having orthogonal slits.
And is fixedly disposed near the focal point of the collimating lens 14. If the lens L to be inspected has a power (refracting 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. For the measurement, 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 so as to be orthogonal to the optical axis and arranged so that their detection directions are orthogonal to each other. The light from the LED 11 is the objective lens 1
2, two image sensors 17 orthogonal to each other via a collimating lens 14, a lens L to be inspected, and an imaging lens 15.
Image each on top.

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. However, when there is no lens to be inspected and when a 0D lens is mounted on the nosepiece 7, the LEDs a, b, and For c and d, the target images formed on the image sensor 17 respectively overlap each other. When the test lens L has only a spherical refractive power, the position of the target image formed on the image sensor 17 is equivalent to the spherical refractive power of the image sensor 17.
Move on. When the test lens L has only a cylindrical refractive power, a light beam incident on the cylindrical lens has a refractive power in a direction (or the same direction) orthogonal to the main diameter line. The columnar refractive power can be calculated from the amount of movement of the target image. Now, L
Each a of ED, b, c, data at the time of lighting the d - center of the target image, respectively _{A (x a, y a)} , B (x b, y b), C
(X _c, y _c), and _{D (x d, y d)} ,

(Equation 1)

(Equation 2)

(Equation 3)

(Equation 4) After all,

(Equation 5)

(Equation 6)

(Equation 7)

(Equation 8) Becomes A microcomputer 25 described later is provided with each LE.
Substituting the center coordinates of the target image by D into the above-mentioned formula to calculate the spherical refraction, the columnar refraction, the axis angle, and the prism amount (when moving the target plate, the correction is made by the amount of movement) Do).

(Control Circuit) FIG. 3 is a block diagram showing a main control circuit of the present apparatus. Two image sensors 1
The signal of 7 is sent to the comparator 2 through the CCD drive circuit 21.
2 and the peak hold circuit 23. The peak voltage input to and detected by the peak hold circuit 23 is:
After being converted into a digital signal by the A / D converter 24, it is input to the micro computer 25. Peak hoe
The digital signal of the peak voltage output from the hold circuit 23 passes through a computer 25 and is peaked by a D / A converter 26.
Is converted to a voltage signal of 1/2 of the working voltage,
Input to the data 22. This signal and the direct comparator 22
A strobe signal is output by comparing the input signal. The signal of the counter 27 enters the latch 28 by the strobe signal, the position of the light and dark edge is read from the waveform at that time, the coordinate position is detected by the microcomputer 25, and the optical position of the lens to be inspected is detected based on the detection result. Calculate the characteristics.
These pieces of information are processed by the microcomputer 25 and are displayed on the display 1 together with characters and graphics together with the information stored in the apparatus via the display control circuit 29.

[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. In the mode for measuring the spherical power, astigmatic power, and astigmatic axis angle of the single focus lens, the display 1 displays a reticle centered on the point indicating the measured 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. Test lens L
Is mounted on the nosepiece 7, the refractive power of the lens L to be measured is calculated and displayed on the display 1, and the optical axis of the lens L to be measured and the optical axis on the measurement optical axis are calculated from the prism value. Obtain the amount of displacement from the lens (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 power multifocal lens will be described. The progressive lens measuring switch 5 is pressed to set 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). Is brought into contact with the frame holder 8, and the lens to be inspected is
It is placed on the speed 7 (contact with the frame holder 8 enables stable movement). 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) in which the test lens should move. The distance portion of the progressive multifocal lens exists on an axis (hereinafter, referred to as a distance portion axis in the present specification) where the prism in the left-right direction of the test lens in the case of a spherical lens is 0. Therefore, the initial marker 32 indicates the position on the distance portion axis (FIG. 4B). When the test lens is a spherical lens, the direction and amount of deviation from the axis of the distance portion can be obtained based on the prism values in the left and right directions at each measurement point. It is displayed at the position indicating the relative position. When the test lens is an astigmatism lens, the position where the prism becomes 0 in the left and right direction of the test lens is on the astigmatism axis, so that the influence of the astigmatism lens is offset from the prism value at each measurement point. Correction is made to values indicating the amount of displacement and the direction of deviation from the application axis (the spherical lens may be considered as a special astigmatic lens with C = 0). Now
For any astigmatic lens having each value of S, C, A, X
-Y coordinate (the optical axis of the lens is 0, and the distance portion axis is Y
Any point A taken as the axis) (x, y) prism amount at (P _x, P _{y) is, P x = - (D xx} · x + D xy · y) P y = - (D yx · x + D yy · y) The prism amount (P _x0 , P _y0 ) at the point B (0, y) is P _x0 = −D _xy · y P _y0 = −D _yy · y where D _xx = S + C sin ² θ D _yx = −C sin θ Cos θ (= D _xy ) D _yy = S + C cos ₂ θ C is a minus reading. From the above equation, since _{P x0 = D xy · (P} y · D xx -P x · D yx) / (D xx · D yy -D yx · D xy) is Ru sought, the P _x0 from P _x Offset and x =
The position of 0 and the display position of the target are determined. This offset calculation is performed thereafter, and its position is monitored. The measurer moves the lens to be inspected and moves the target 31.
Is matched with the marker 32 (c in FIG. 4), and the refractive power a at the position where the match signal is obtained is stored. When the power of the distance portion is small (for example, ± 0.25 D or less), the change in the amount of prism is small, so that the accuracy of the apparatus and the surface accuracy of the lens are affected, and good alignment accuracy may not be obtained. .
Therefore, when it is detected that the lens has a small power, 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 treated as the position on the distance portion axis.

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 that has left 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) 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). The marker 32 is only for indicating the moving direction of the target 33. Tar
The measurer moves the lens to be measured forward so that the get 33 moves toward the marker 32. The refractive power is continuously measured during the movement, and the
Converts the movement distance from the prism amount of the lens, and detects a change in addition per unit movement 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 differs depending on the type of progressive lens and the addition power, and is not fixed. However, for progressive lenses currently on the market, each lens lens is several mm (4 to 8 mm) above the addition start position. This corresponds to the far vision area specified by f. 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 marker 3
2 changes the 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 moves to the near portion measurement step (FIG. 5D). 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. When the change in the prism amount is converted into a movement amount, a measurement error is likely to occur when the refractive power is small. Therefore, when the refractive power is smaller than a predetermined amount (for example, 0.5 D or less), based on the increase amount of the addition power. Determine the amount of movement. Further, the same processing is performed on a lens whose prism change is disturbed.

While moving in the progressive section, the apparatus makes continuous measurements and displays the measured addition on the display 37 as well as a 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 prismatic power at the measurement position and the prismatic power at the distance portion, and numerically displays the difference on the display unit 39 as an optical distortion amount. ) 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 (e, f in FIG. 5). 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. In this manner, the measurement is performed up to the lower side of the spectacle frame, and the measurement of the near portion is completed when the target 36 is located substantially at the center of the right and left sides (g in FIG. 5).

(B) When it is determined that the measurement point is in the progressive portion. In this case, the target 33 is displayed on the marker 32 (FIG. 6A), and the measurement point is moved to the upper side of the lens to move the target 33 in the direction of the marker 32. The marker 32 merely indicates the moving direction of the target 33. The apparatus continuously measures the dioptric power, converts the moving distance based on the amount of prism of the lens, and detects a change in addition per unit moving distance. 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 is detected that it has moved and entered the distance portion, the marker 32 changes its shape to a cross-shaped marker 35 to notify that they match (FIG. 6B). Detecting that the measured value at this distance measuring point is stable,
The microcomputer 25 stores this measured value. After storing the measured value at the distance portion measurement point, the near portion measurement is performed in the same manner as (a).

[0019]

Embodiment 2 The configuration of Embodiment 2 is different from that of Embodiment 1 in that
A feature is that a position detection 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 measurement system itself is the same as that of the first embodiment, a description thereof will be omitted. FIG. 7 is a sectional view of the position detecting mechanism of the lens to be inspected, and FIG. 8 is a sectional view taken along line AA of FIG. 8
Is a backing plate for pressing a frame (the lens L is simply placed in the figure), and 41 is 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. 43 is the guide pin 41 leftward (upward in FIG. 7)
This is a coil spring that urges the coil spring. The rack 44 is supported movably in the front-rear direction of the apparatus, and the backing plate 8 is fixed to the rack 44, so that 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 controlled by the gear 4 via the rotating shaft 46.
It is conveyed to 8. The amount of rotation of the gear 48 is detected by a potentiometer 49. The rack 44 has a pinion 5
0 is engaged, and the amount of rotation of the pinion 50 is detected by the potentiometer 51. These signals are processed,
Input to the microcomputer. By moving the test lens L while making contact with the abutment plate 8 and the guide pin 41 in this manner, the amount of movement of the test lens L is detected, and the display information of the target and the marker is determined based on this detection information. .

In the first embodiment, the change in the amount of prism in the vertical direction (or the horizontal direction) of the lens is converted into the moving distance of the lens to be measured (measurement point). The only difference is that direct detection is performed, and a description of the operation of the apparatus is omitted. 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, and the target Can be moved in proportion to the amount of movement of the test 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. Further, it is not always necessary to perform all the steps described in the embodiments. For example, in the process of obtaining the power at the distance portion, the prism in the left-right direction becomes 0
At the point in time, if the examiner determines that it is in the distance section, it may be possible to provide a switch for omitting the operation for obtaining the additional power start position, or further, at the time of shifting to the near section measurement,
If it is not necessary to see the change in the addition of the progressive part, the operation may be performed so as to determine the left and right positions.

[0022]

According to the present invention, a highly reliable addition measurement can be performed even with a progressive lens which has been subjected to special processing called prism thinning. Further, the addition can be measured without depending on the skill 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 device.

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 Marker 37 Display 38 Bar Graph

Claims (6)

(57) [Claims] 1. A lens meter for projecting measurement light onto a lens to be measured, detecting the trajectory of the measurement light transmitted through the lens to be measured by a light receiving element, and measuring the optical characteristics of the lens to be measured based on the detection result. , A mode switching means for switching to a progressive lens measurement mode, a measurement control means for continuously measuring a refraction power at predetermined intervals, and a cumulative mode by said mode switching means.
When in the progressive lens measurement mode, to guide the measurement point
Displays a graphic figure with an area imitating a corridor
Display and the lens under test is assumed to be a spherical lens.
To the position where the amount of prism in the left-right direction becomes almost 0 when
A marker to be moved to a corresponding position is measured and controlled.
Said mask based on the measurement result measured by the control of the means.
A target indicating the current measurement point for the
A first guiding means to be displayed on the spray, and a measuring point to be a distance portion
Storage means for storing a measurement result when in an area, and a measurement point
Measurement of the distance section to move the camera toward the near section.
The measurement point is outside the corridor based on the result and the current measurement result.
Monitoring means for monitoring whether or not the
When the measurement point deviates from the progressive zone,
Indication on the display that there is a measurement point outside the band
When the measurement point is in the progressive zone,
A moving mark for moving the corridor is displayed on the display.
And a second guiding means for displaying the information . 2. The lens meter according to claim 1, wherein
The first guiding means is based on the amount of prism in the horizontal direction at each measurement point.
Offset the effect of astigmatism lens and deviate from the far vision axis
A lens meter having calculation means for obtaining an amount and a deviation direction . 3. The lens meter according to claim 1, wherein:
The first guiding means may further comprise the target being coincident with the marker.
After that, the far vision marker is displayed at the position indicating the far vision area,
For the distance part marker based on the measurement result at each measurement point
Display the target for the distance section, and guide the user to the distance section area.
A lens meter characterized by performing . 4. The lens meter according to claim 1, wherein:
The storage means is based on the continuously measured change in refractive power
To determine that the measurement point is in the far vision area,
Automatically obtain the measurement result of the distance area based on the results
The lens meter characterized by the above. 5. A measuring lens is projected onto a lens to be measured, and
The trajectory of the measuring light that has passed through the laser
The optical characteristics of the lens under test based on the detection results
In lens meter, switch to progressive lens measurement mode
Mode switching means, and the refraction power continuously at predetermined intervals.
Measurement control means for measuring and the mode switching means
When in the progressive lens measurement mode, to guide the measurement point
Displays a graphic figure with an area imitating a corridor
Display and the test level in the horizontal and vertical directions.
Movement detecting means for detecting the movement of the lens, and a lens to be inspected.
The amount of prism in the horizontal direction when is assumed to be a spherical lens
To the position corresponding to the position where
-Based on the detection result by the movement amount detection means
A target indicating the current measurement point for the marker
The first guiding means displayed on the display and the measuring point
Storage means for storing a measurement result when in the distance section area;
To move the measurement point toward the near area,
The measurement point is progressive based on the measurement result of
Monitoring means for monitoring whether or not the band has been removed;
Measurement points based on the results of the movement amount detection means.
If you are out of the corridor, there must be a measurement point outside the corridor
Is displayed on the display, and the measurement point is within the corridor.
When moving, the moving mark for moving the corridor is displayed on the display.
And a second guiding means for displaying on a ray . 6. A measuring lens is projected onto a lens to be measured.
The trajectory of the measuring light that has passed through the laser
The optical characteristics of the lens under test based on the detection results
In lens meter, switch to progressive lens measurement mode
Mode switching means, and the refraction power continuously at predetermined intervals.
The measurement control means for measuring and the test lens are assumed to be spherical lenses.
Where the amount of prism in the left-right direction is almost 0 when set
First guiding means for guiding a measurement point to a position,
Guides the measurement point from the position
2 guiding means, and when moving in accordance with the second guiding means.
Distance based on the continuously measured change in refractive power
Distance power measuring means for obtaining and storing power, and distance power astigmatism
Calculate the difference between the number and the astigmatic power of the measurement point and determine the difference between the astigmatic powers
Determining means for determining whether the position is within the range of the second and the second determining means
Indicates that the measurement point has deviated from the progressive part based on the judgment result of
Measure the distance to the near part after memorizing the distance power
Lens monitoring means for moving a point .