JP3320110B2 - Ophthalmic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmic apparatus used in an eyeglass store or the like.

[0002]

2. Description of the Related Art In a conventional ophthalmologic apparatus, it is necessary to press a switch to record a measured value after completion of alignment, and a member for pressing a spectacle lens is used. There is also known an automatic measuring device having no member for pressing.

[0003]

In this conventional example, usually, it is necessary to perform alignment while holding the glasses with both hands, and after the alignment is completed, it is necessary to shift one hand or release one hand to press a switch. It is difficult to press the switch so that it does not shift. Also,
Although it is possible to use a spectacle holding member and fix the lens after alignment and then press the switch, there is a drawback that the measurement takes time.

In an apparatus without a holding member,
Although it is detected that the position of the detected light beam does not change, for example, when comparing the positions of five light beams, there are x and y directions, respectively, and it is necessary to compare ten numerical values. Further, although it is possible to use only one light beam on the optical axis, there is a drawback that fluctuations in the optical axis direction, inclination, and the like of the test lens cannot be detected. In addition, since the determination is made based on whether or not the change in the position of the light beam is within a predetermined value, there is a disadvantage that the accuracy of the eccentricity at the time of measurement changes according to the refractive power of the lens to be measured.

An object of the present invention is to solve the above-mentioned problems and to provide an ophthalmic apparatus capable of simply and accurately measuring the refractive power of a lens to be measured.

[0006]

According to the present invention, there is provided an ophthalmologic apparatus, comprising: a light beam projecting unit for projecting a projection light beam onto a lens to be inspected; and a position of the lens to be inspected in an optical axis direction. The position of the lens to be inspected, a light beam selecting device for selecting a part of the projection light beam, a light beam detecting device for photoelectrically detecting the light beam selected by the light beam selecting device, and a light beam detecting device. An ophthalmologic apparatus comprising: a refraction information calculating means for calculating and calculating refraction information of the lens to be detected based on the detected information; and an alignment display means for displaying an alignment state of the lens to be tested. When the refractive power of the prism is Sy, and the eccentricity allowable to the extent that the measured value is not affected is h, the horizontal prism degree Px of the prism calculated by the refraction information calculating means, the vertical The value of the counter prism factor Py, respectively | Px | <Sx × h, | Py | <when satisfy the Sy × h, wherein the alignment and judging to be in the allowable range.

[0007]

The ophthalmologic apparatus according to the present invention having the above configuration is
It is detected that the lens to be measured is held for a certain period of time within the range of the measured values, and it is determined that the alignment is completed, the measured values are stored, and the measurement is terminated.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiments. FIG. 1 is a configuration diagram of an embodiment. On the optical path 09 of the measurement light source 71, a collimator lens 72 and a lens
A lens contact member 73, a five-hole stop 74, and an image pickup element 75 are arranged. As shown in FIG. 2, the five-hole stop 74 has five openings 74a to 74e, and four openings 74a to 74d are arranged on the circumference and the opening 74e is provided at the center. Further, the image sensor 75 is connected to a drive circuit 77, and the output of the drive circuit 77 is an AD converter 78,
It is connected to a data bus circuit 80 via an image memory 79. The output of the driving circuit 77 is output from the image
Is connected to the image synthesizing means 81 and the image symbol generating means 8
2 is also connected, and the output of the image combining means 81 is connected to a television monitor 83.

In addition to the image memory 79, the data bus circuit 80 includes an image symbol generating means 82, a microcomputer 84, a ROM 85 storing programs of the microcomputer 84, and an RA for storing arithmetic and data.
M86 and the light source control means 87 for measurement are connected, and the output of the light source control means 87 for measurement is connected to the light source 71 for measurement.

The light beam from the measuring light source 71 passes through the collimator lens 72, is projected on the lens G to be inspected, and refracted.
The light beam is divided into a plurality of light beams by a five-hole stop 74 substantially on the rear surface of the test lens G, and forms an image P on the image sensor 75 as a measurement light beam image P. The position of the test lens G in the optical axis direction at the time of measurement is set by the lens contact member 73.

The image sensor 75 is driven by a drive circuit 77, and the measured light beam image projected on the image sensor 75 is output from the drive circuit 77 as an image signal. The output image signal is digitized by the AD converter 78 and stored in the image memory 79. From the data stored in the image memory 79, the microcomputer 84 determines the position coordinates of the light flux image on the image sensor, and calculates the horizontal prism degree P of the prism as refraction information of the test lens from the coordinates.
x, the vertical prism power Py, the spherical power S, the cylindrical power C, and the axial angle A thereof are obtained.

An image symbol for displaying the alignment mark M and the measured value is generated by the image symbol synthesizing means 82, and a signal indicating these symbols is synthesized by the image synthesizing means 81 with the image signal output from the drive circuit 77. And displayed on the television monitor 83. FIG. 3 shows a television monitor 83.
FIG. 7 is an explanatory diagram of the upper image, in which an alignment mark M indicating the position of the optical axis is projected, and a 5-hole aperture 74 is further provided.
Of light fluxes Fa to selected through the five openings 74a to 74e
An image of Fe is shown.

When the lens G to be inspected is a general spherical lens, its refractive power is measured at the optical center. Therefore, while watching the television monitor 83, the center light beam image Fe is cross-shaped to indicate the optical axis position. The alignment is performed by moving the test lens G so as to match M. While holding the test lens G so as not to move for about 1 second after the completion of the alignment, the microcomputer 84 uses the microcomputer 84 to determine the refraction information of the test lens G in the horizontal and vertical prism degrees Px and Py of the prism. The spherical power S, the cylindrical power C, and the axial angle A are calculated, and the horizontal prism power Px and the vertical prism power Py are further calculated for about 1 second.
Is within a predetermined value, and when it is determined that there is almost no change in the values of the spherical power S, the cylindrical power C, and the axis angle A, it is determined that the alignment is completed, and the measured value at that time is used as the measured value of the lens G to be measured. Store and end the measurement.

FIG. 4 is a flowchart showing this operation. In step 101, a timer for measuring one second is cleared, and this timer is not shown, but is always counted up at regular intervals. Step 1
At 02, refraction information is calculated by detecting the measurement light beam. In step 103, it is checked whether the lens to be inspected is in contact with the position setting member. If not, the process returns to step 101 to clear the timer and repeat the measurement. If the lens to be inspected is in contact, In step 104, it is determined whether the horizontal prism degree Px and the vertical prism degree Py of the prism are within predetermined values. If not within the predetermined value, step 1
Returning to 01, the timer is cleared and the measurement is repeated. If it is within the predetermined value, it is confirmed in step 105 that the spherical power S, the cylindrical power C and the shaft angle A have not changed, and if they have changed, In step 101, the timer is cleared and the measurement is repeated.

If there is no change, step 106
It is checked whether the state has continued for one second or more. If not, the process returns to step 102 and repeats the measurement without clearing the timer. If one second or more has elapsed, it is determined in step 107 that the alignment is completed, the measured value at that time is stored as the measured value of the lens to be measured, and the measurement is terminated.
Note that the determination in step 105 is that the prism value has not changed, but that the other values change, such as the direction of the optical axis or a tilting movement. Any or all of the spherical power S, the cylindrical power C, and the axial angle A may be omitted.

In this embodiment, the values of the prism degree Px in the horizontal direction and the prism degree Py in the vertical direction under the condition for terminating the alignment are within a predetermined range, but this range is determined by the equation of Prentice as | Px | <Sxx. h | Py | <Sy × h, it is possible to measure with a constant eccentricity regardless of the refractive power of the lens G to be inspected. This is effective when measuring the distance. Here, h is an allowable eccentric amount, which is an allowable eccentric amount that does not affect the measured value, and is usually, for example, 0.05 cm. The refractive power Sx in the horizontal direction and the refractive power Sy in the horizontal direction can be obtained by calculation using the spherical power S, the cylindrical power C, and the axial angle A.

FIG. 5 is a flow chart showing the operation of the apparatus under the above-mentioned conditional expression. In place of step 104 in FIG. 4, step 111 shows the horizontal refractive power Sx and vertical refractive power of the lens G to be inspected. Calculate the force Sy, step 112
To check whether the prism degrees Px and Py satisfy the conditional expressions.

The flowchart in FIG. 5 relates to automatic measurement at the optical center. However, as shown in the flowchart in FIG. 6, it is detected that there is no change in the prism degrees Px and Py for a certain period of time, and alignment is not performed. When it is determined that the measurement has been completed, the automatic measurement can be performed by holding the test lens G for a certain period of time even outside the optical axis. It is confirmed in step 113 that there is no change in the prism degrees Px and Py in place of the step in FIG.

FIG. 7 is a block diagram of another embodiment in which the optical center distance of a spectacle lens can be measured by using this embodiment. The data bus circuit 80 shown in FIG. A potentiometer 92 is connected, and this potentiometer 92 is used for measuring the next eyeglass position.

FIG. 8 shows an optical center distance measuring mechanism. In order to hold the eyeglasses GS at a predetermined position, there are provided a horizontally movable eyeglass backing plate 93, a movable back and forth support 94, and an eyeglass fixing member 95. ing. And potentiometer 9
The second shaft can rotate by meshing with a rack 93a provided on the spectacle plate 93.

The spectacles GS are fixed to the spectacle plate 93 by bringing the nose pad of the spectacles GS into contact with the fixing member 95. The potentiometer 92 rotates via the rack 93a by moving the spectacle plate 93 right and left, and its resistance value changes according to the position of the plate 93. The resistance value of the potentiometer 92 is converted into a voltage, and is read into the microcomputer 84 as positional information of the backing plate 93 via the AD converter 91 shown in FIG.

When one of the lenses G to be measured is measured, the measured value of the refractive power at this time is stored, and at the same time, the position of the spectacle plate 93 is read. Next, the spectacles GS and the spectacle plate 93 are switched in reverse, and the other lens G to be measured is measured in the same manner and the measured value is stored. At the same time, the position of the spectacle plate 93 is read. At this time, the difference between the positions of the left and right eyeglass contact plates 93 is the distance between the optical centers of the eyeglasses GS. In this case, the eccentricity is required in the horizontal direction, and the measurement is performed with a constant eccentricity irrespective of the refractive power of the lens G to be measured by using the Prentice's equation for comparison of the prism value Px in the horizontal direction. be able to.

In the above embodiment, the measurement point itself is accurately obtained. However, even if the measurement point slightly deviates from the true optical center, the measurement point is corrected by the Prentice's formula to thereby accurately correct the spectacles GS. The distance between the optical centers can be determined.

FIG. 9 is a diagram showing the relationship between the true optical center and the actual measurement point, and the right and left true optical centers C1 and C2 of the glasses GS.
The distance between them is the true optical center distance R1. Assuming that the distance between the points B1 and B2 measured by the lens meter is actually the measured distance R2, the eccentricity Δh1 is obtained from the horizontal prism value and the refractive power at the measurement points B1 and B2 by the above-mentioned Prentice's formula. , Δh2, and the true optical center distance R1 can be obtained by correcting the measurement distance R2.

In the above embodiment, the stop 74 is arranged directly on the rear surface of the lens G to be inspected, but may be provided at a position substantially conjugate with the rear surface of the lens G to be inspected.

Although an image sensor is used as the light beam detecting means, a line sensor, a position detector (PSD),
The same effect can be obtained by using a photo sensor or the like. Further, although a diaphragm having a plurality of apertures is used as the light beam selecting means, the shape of the opening may be a ring shape or a shape corresponding to the light beam detecting means. Further, although the television monitor is used as the display means, a display means such as an LED or a liquid crystal may be used.

[0027]

As described above, in the ophthalmologic apparatus according to the present invention, after the alignment of the lens to be inspected is completed, if the alignment of the lens to be inspected is not performed for a certain period of time, the alignment is automatically terminated. Because the measured value of the test lens is stored, the test lens can be measured simply by holding the test lens for a certain period of time without having to press the switch to store the measured value. Irrespective of this, the measurement can be performed with a constant eccentricity accuracy, and the distance between the optical centers of the spectacle lenses can be easily and accurately measured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment.

FIG. 2 is a front view of a five-hole aperture.

FIG. 3 is an explanatory diagram of a light beam image on a television monitor.

FIG. 4 is an operation flowchart.

FIG. 5 is an operation flowchart.

FIG. 6 is an operation flowchart.

FIG. 7 is a configuration diagram of another embodiment.

FIG. 8 is a configuration diagram of a part for detecting an optical center distance of an eyeglass lens.

FIG. 9 is a diagram illustrating a relationship between a true optical center point and an actual measurement point.

[Explanation of symbols]

 71 light source for measurement 75 image sensor 78, 91 AD converter 83 television monitor 84 microcomputer 92 potentiometer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-35638 (JP, A) JP-A-3-126433 (JP, A) JP-A-4-152237 (JP, A) JP-A-3-152 296638 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A61B 3/00-3/16

Claims (4)

(57) [Claims] 1. A light beam projecting device for projecting a projection light beam onto a test lens, a test lens position setting device for setting a position of the test lens in an optical axis direction, and a part of the projection light beam is selected. Light beam selecting means, light beam detecting means for photoelectrically detecting the light beam selected by the light beam selecting means, and refraction information calculating means for calculating refraction information of the lens to be inspected based on information detected by the light beam detecting means. And an alignment display means for displaying an alignment state of the test lens, wherein the horizontal refractive power is Sx, the vertical
Sy, the refractive power in the direct direction, so as not to affect the measured value
When the permissible eccentricity is h, the horizontal prism degree Px of the prism calculated by the refraction information calculating means,
The value of the vertical prism degree Py is | Px | <S
An ophthalmologic apparatus, wherein when the condition x × h, | Py | <Sy × h is satisfied , the alignment is determined to be within an allowable range. 2. The method according to claim 1, wherein the alignment is within a predetermined time allowable range.
If it is located, it is determined that the alignment adjustment has been completed, and the measured value
The ophthalmic apparatus according to claim 1, wherein
Place. 3. The movement of the lens to be inspected based on the refraction information.
The ophthalmic apparatus according to claim 1, wherein the ophthalmic apparatus detects
Place. 4. A spherical power S and an axial angle which are the refractive power information.
If the value of the degree A does not change for a predetermined time, the movement of the lens to be inspected
And that the alignment adjustment has been completed.
The method according to claim 1 or 2, wherein the determination is made and the measured value is stored.
4. The ophthalmic apparatus according to 2 or 3.