JP2002119475A - Alignment apparatus and optometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alignment apparatus and an optometer capable of making a Z-directional auto-alignment region wide. SOLUTION: This optometer is provided with the Z-alignment detection optical system 100R detecting the Z-directional coarse alignment. The Z- alignment detection optical system 100R has an image formation lens 101 and a CCD 102 photographing the image formation lens 101 and the front eye part from a diagonal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an alignment detecting device for detecting a coarse alignment in a Z direction, and an optometric apparatus equipped with the alignment detecting device.

[0002]

2. Description of the Related Art Conventionally, there has been known an alignment detecting device which detects a position in a Z direction and automatically performs alignment.

When the apparatus main body is moved within a predetermined area in the Z direction, the alignment detecting apparatus detects a position in the Z direction, obtains a shift amount from the alignment completion position in the Z direction, and based on the shift amount. This is for automatically performing precise alignment in the Z direction by moving the apparatus body.

[0004]

However, in such an alignment detecting device, the region where the automatic alignment can be performed is narrow, and the device main body must be manually moved to that region, and the operation is troublesome. And so on.

The present invention has been made in view of the above problems, and has as its object to make it possible to widen the auto-alignment area in the Z direction and to perform an operation of moving the apparatus body to the auto-alignment area. An object of the present invention is to provide an alignment apparatus that can be easily performed and an optometry apparatus equipped with the alignment apparatus.

[0006]

According to one aspect of the present invention, there is provided an image pickup means for picking up an anterior eye from an oblique direction, and an image of a subject's eye formed on a light receiving surface of the image pickup means. And a coarse alignment detecting means for detecting a coarse alignment in the Z direction from the position (1).

According to a second aspect of the present invention, there is provided a slit light beam projection optical system for projecting a slit light beam obliquely toward an anterior eye, an imager for imaging the anterior eye from the front, and a light receiving surface of the imager. A rough alignment detecting means for obtaining an irradiation part of the anterior eye part irradiated by the slit light beam from the formed anterior eye part image and detecting a coarse alignment in the Z direction from the position of the irradiation part; I do.

According to a third aspect of the present invention, there is provided a left-eye refractive power measurement unit and a right-eye refractive power which can be driven to approach and move away from each other at least to the right and left and can determine the eye refractive power of the left and right eyes of the subject. An optometry apparatus including a measurement unit,
Imaging means for obliquely imaging the anterior segment of the eye to be inspected; and Z
Coarse alignment detecting means for detecting coarse alignment in each direction is provided for each measuring unit, and each measuring unit is moved based on the coarse alignment information detected by each coarse alignment detecting means to perform coarse alignment. It is characterized in that alignment in the Z direction is performed.

According to a fourth aspect of the present invention, there is provided a left-eye refractive power measuring unit and a right-eye refractive power which can be driven to approach and move away from each other at least to the right and left and can determine the eye refractive power of the left and right eyes of the subject. An optometry apparatus including a measurement unit,
A slit light beam projection optical system for projecting a slit light beam from an oblique direction toward the anterior eye, an imaging unit for imaging the anterior eye from the front, and a slit from an anterior eye image formed on a light receiving surface of the imaging unit A coarse alignment detecting means for obtaining an illuminated portion of the anterior segment irradiated by the light beam and detecting a coarse alignment in the Z direction from the position of the illuminated portion is provided in each measurement unit. The method is characterized in that each measurement unit is moved based on the alignment information to perform coarse alignment, and thereafter, precise alignment in the Z direction is performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an optometry table whose height can be adjusted up and down, 2 is a refractive power measuring device (optometry device) disposed on the optometry table 1, 3 is an optometry chair, and 4 is an optometry chair 3. A seated subject.

As shown in FIGS. 1 to 7, an eye refractive power measuring device 2 comprises a box body 5 formed in an inverted L-shape from an upright portion 5a and an upper horizontal portion 5b, and an upright portion 5a. Flat support portions 6 and 7 are provided integrally on both left and right sides of the front surface and extend toward the front. Further, the eye refractive power measuring device 2
Has cursor keys (cursor buttons) 8, 9, 10, 11 provided on the left flat support portion 6, and a joystick lever 12 provided on the right flat support portion 7. A photographing switch 12a is provided at the upper end of the joystick lever 12.
Is provided.

Further, the eye-refractive-power measuring device 2 includes a horizontal portion 5a.
Stay 1 attached to the lower surface of the central part of
3, a support shaft 14 protruding from the stay 13, and a support shaft 1
And a left eye refractive power measurement unit 16L disposed on the left and right of the forehead 15 attached to the forehead 15, respectively.
And a right eye refractive power measurement unit 16R.

The eye refractive power measuring units 16L and 16R
Are supported by the horizontal portion 5a by supporting means 17L and 17R which can be driven in three-dimensional directions. This support means 1
Reference numeral 7L denotes a three-dimensional driving device (three-dimensional driving mechanism) 18L disposed in the horizontal portion 5a, and a horizontal rotating device (horizontal rotating driving device) disposed below the three-dimensional driving device 18L as a tertiary driving means. Having. Further, the support means 17R is provided for the horizontal portion 5
a three-dimensional drive device (three-dimensional drive mechanism) 1
It has a horizontal rotation device (horizontal rotation drive device) 19R disposed below 8R. <Three-dimensional driving device> Three-dimensional driving device (three-dimensional driving means)
Reference numerals 18L and 18R denote Y (vertical) direction driving devices (driving means) 20 for vertically moving the support shaft 20a using a pulse motor, a hydraulic cylinder, or the like, and Y (vertical) attached to the lower end of the support shaft 20a. Direction supporting member 21, a Z-direction moving supporting member 22 attached to the Y-direction moving supporting member 21 so as to be movable in the Z (front-back) direction, and a Z-direction moving supporting member 22 capable of moving in the X (left-right) direction. It has an X-direction moving support member 23 attached.

As shown in FIG. 8, the Z-direction moving support member 22 includes a Z-direction driving device (driving means) 24 such as a pulse motor attached to the Y-direction moving supporting member 21.
And a feed screw 25 rotated and driven by a Z-direction drive unit 24 to drive the Z-axis drive unit 24 to move forward and backward in the Z (front-back) direction. The X-direction moving support member 23 is driven by a left-right driving device (driving means) 26 such as a pulse motor attached to the Z-direction moving support member 22 and a feed screw 27 rotationally driven by the pulse motor 26 so that X (right and left) is controlled. ) Direction. <Horizontal rotating device> Also, a horizontal rotating device (horizontal rotating means)
19L and 19R are Xs of the three-dimensional driving devices 18L and 18R.
Horizontal rotation driving devices (convergence driving means) 28, 28, such as pulse motors, fixed at the centers of the moving support members 23, 23
And rotating shafts 29, 29 driven to rotate about vertical axes by pulse motors 28, 28, respectively. The left eye refractive power measurement unit 16L and the right eye refractive power measurement unit 16R are fixed to the rotation shafts 29, 29. <Eye refractive power measurement unit> Left eye refractive power measurement unit 16
The configuration of the L and right eye refractive power measurement unit 16R is substantially the same except for omitting a part, and therefore, the measurement optical system of the left eye bending power measurement unit 16L will be described first. (A) Measurement optical system of left eye refractive power measurement unit 16L The measurement optical system of left eye refractive power measurement unit 16L is an anterior ocular segment observation optical system 30L shown in FIGS. 9, 10, and 11.
XY alignment optical system 31L and fixation optical system 32
L, a refractive power measuring optical system 33L, and a Z alignment optical system 100L for detecting coarse alignment in the Z direction. Note that the measurement optical system of the right eye refractive power measurement unit 16R includes an anterior ocular segment observation optical system 30R and X as shown in FIG.
Y alignment optical system 31R, fixation optical system 32R,
It has a refractive power measuring optical system 33R and a Z alignment detecting optical system 100R for detecting coarse alignment in the Z direction. (Anterior segment observation optical system 30L) Anterior segment observation optical system 30L
Has an anterior segment illumination optical system 34 and an observation optical system 35.

The anterior segment illumination optical system 34 has a light source 36 for anterior segment illumination, a diaphragm 36a, and a projection lens 37 for projecting light from the light source 36 to the anterior segment of the eye E to be examined.

The observation optical system 35 includes a prism P on which reflected light from the anterior segment of the eye E is incident, and the objective lens 3.
8, dichroic mirror 39, diaphragm 40, dichroic mirror 41, relay lenses 42, 43, dichroic mirror 44, CCD lens (imaging lens) 45, C
A CD (imaging means) 46 is provided in this order. (XY alignment optical system 31L) The XY alignment optical system 31L has an alignment illumination optical system 47 and an observation optical system 35 as an alignment light receiving optical system. As shown in FIG. 10, the alignment illumination optical system 47 includes an illumination light source 48 for alignment, a diaphragm 49 as an alignment target, a relay lens 50, a dichroic mirror 41, a diaphragm 40, a dichroic mirror 39, an objective lens 38, and a prism. P in this order. (Fixation Optical System 32L) The fixation optical system 32L includes a fixation target light source 51, a collimator lens 52, a fixation target 53, a reflection mirror 54, a collimator lens 55, a reflection mirror 56, a moving lens 57, a relay lens 58, 59, reflection mirror 6
0, dichroic mirrors 61 and 39, objective lens 38
And a prism P in this order.

In the fixation optical system 32L, the moving lens 57 can be moved in the optical axis direction by a pulse motor PMa in accordance with the refractive power of the eye to be examined, and can fixate the cloud. (Refractive power measuring optical system 33L) Refractive power measuring optical system 33L
Are the measuring beam projection optical system 62 and the measuring beam receiving optical system 6
3

The measurement light beam projection optical system 62 includes a measurement light source 64 such as an infrared LED, a collimator lens 65, a conical prism 66, a ring target 67, a relay lens 68, a ring stop 69, and a through hole 70a formed in the center. It has a perforated prism 70, dichroic mirrors 61 and 39, an objective lens 38 and a prism P in this order.

The measuring light beam receiving optical system 63 includes a prism P for receiving reflected light from the fundus oculi Ef of the eye E, an objective lens 38, dichroic mirrors 39 and 61, a through hole 70a of a perforated prism 70, and a reflecting mirror. 71, a relay lens 72, a moving lens 73, a reflection mirror 74, a dichroic mirror 44, a CCD lens 45, and a CCD 46 in this order. (Z alignment detection optical system 100L) The Z alignment detection optical system 100L includes an imaging lens 101 and a CCD.
(Image pickup means) 102, and when the rough alignment in the Z direction is completed, an anterior eye image is formed at the center of the CCD 102. When the eye E moves away from the coarse alignment completion position, An eye part image is formed on the right side of the CCD 102, and when the eye E to be examined approaches the coarse alignment completion position, an anterior eye part image is formed on the left side of the CCD 102.

An arithmetic control circuit (coarse alignment detecting means) 62 described later detects coarse alignment in the Z direction from the position of the anterior ocular segment image formed on the light receiving surface 102A of the CCD 102, and moves in a direction in which the coarse alignment is completed. The drive of the Z-direction drive device 24 is controlled. And CCD
An alignment detection device is configured by the arithmetic control circuit 62 and the control control circuit 62.

The measuring optical system of the right-eye refractive power measuring unit 16R is exactly the same as the measuring optical system of the left-eye refractive power measuring unit 16L, and a description thereof will be omitted. (Control Circuit of Left Eye Refractive Power Measuring Unit 16L) The above-described driving devices 20, 24, 26, 28, the light source 36 for observing the anterior segment, the light source 51 for the fixation target, the light source 64 for measurement, the pulse motor PMa, and the like are The operation is controlled by the arithmetic and control circuit 62 shown in FIG. The arithmetic control circuit 62 receives a detection signal from the CCD. (B) Measurement optical system and control system of right eye refractive power measurement unit 16R The right eye refractive power measurement unit 16R has the same configuration as the left eye refractive power measurement unit 16L as described above. <Overall Control Circuit> As shown in FIG. 14, the overall control circuit includes the above-described control circuits 62, 62 of the eye refractive power measurement units 16L, 16R and an arithmetic control circuit 63 for controlling the control circuits 62, 62. Have. The arithmetic control circuit 63 includes:
A tilt detection sensor 12 that detects a tilt operation of the photographing switch 12a and the joystick lever 12 to the front, rear, left and right.
b, a rotation sensor 12c for detecting a rotation operation of the joystick lever 12 about an axis is connected. Also,
A display device (display means) 64 such as a liquid crystal display is connected to the arithmetic control circuit 63. This liquid crystal display 64
It is arranged and used on the front side of the box body 5 as shown in FIG.

Next, the state of use of the eye-refractive-power inspection apparatus having such a configuration will be described. (1) Adjusting the height of the eye refractive power measurement unit, etc. The subject 4 is seated on the chair 3 as shown in FIG. 1, and the height of the prisms P, P of the eye refractive power measurement units 16L, 16R is The height of the optometry table 1 is adjusted up and down by a vertical driving unit (not shown) so that the eye height becomes the height of the eye. A well-known vertical drive mechanism for the optometry table 1 can be employed, and a detailed description thereof will be omitted. (2) Alignment to Left and Right Eyes in Far Vision State Next, when the subject 4 turns on the power supply of the eye refractive power measurement device 2 (not shown), the operation procedure is sequentially displayed on the arithmetic control circuit display device 64. . The subject 4 proceeds with the optometry according to the procedure.

At this time, the arithmetic control circuit 63 includes the arithmetic control circuits 62 of the eye refractive power measurement units 16L and 16R.
The operation of 62 is controlled to start preparation for an alignment operation for the left eye EL and the right eye ER of the subject 4. That is, each operation control circuit 6 of the eye refractive power measurement units 16L and 16R
Reference numerals 2 and 62 denote anterior segment observation light sources 36 of the eye refractive power measurement units 16L and 16R, illumination light sources 48 for alignment,
The fixation target light source 51 is turned on. Further, the arithmetic control circuits 62, 62 of the eye refractive power measurement units 16L, 16R operate and control the horizontal rotation driving devices 28, 28 based on the control signal from the arithmetic control circuit 63, to thereby control the eye refractive power measurement units 16L, 16R. The optical axes OL, OR directed from the 16R prisms P, P toward the subject 4 are made parallel as shown in FIGS.

In such a state, when the subject 4 measures the refractive power of the left and right eyes, the subject 4 makes the forehead abut the forehead 15 before the measurement, and the subject 4 The optical axes of the left and right eyes 4 are prisms P, P of the eye refractive power measurement units 16L, 16R.
The XY alignment is performed by moving the eye refractive power measurement units 16L and 16R right and left and up and down so as to come to the center position (optical axis OL and OR) of the eye. (i) Alignment of left eye refractive power measurement unit with left eye EL (a) X of left refractive power measurement unit 16L with respect to left eye EL
Y Alignment For the XY alignment, the arithmetic control circuit 63 is set to perform the XY alignment of the left eye refractive power measurement unit 16L first. That is, the arithmetic control circuit 63
First, the driving device 2 of the left eye refractive power measurement unit 16L
0 and 26 are controlled by the joystick lever 12 so that they can be driven.

At this time, the illumination light from the anterior segment illumination light source 36 is projected onto the anterior segment of the subject's eye EL via the stop 36a and the projection lens 37. Then, the reflected light from the anterior segment is applied to the prism P, the objective lens 38, the dichroic mirror 39, the diaphragm 40, and the dichroic mirror 4.
1, relay lenses 42, 43, dichroic mirror 4
4, CCD through CCD lens (imaging lens) 45
(Imaging means) Projected onto 46, and the left eye E
An image of the anterior segment of L is formed.

On the other hand, an illumination light source 48 for XY alignment
Of the alignment light beam from the lens, an aperture 49 as an alignment target, a relay lens 50, a dichroic mirror 4
1. Cornea CL of left eye EL of subject via aperture 40, dichroic mirror 39, objective lens 38, and prism P
Is projected on. The reflected light from the cornea CL is
Prism P, objective lens 38, dichroic mirror 3
9, a CCD (imaging means) 46 via an aperture 40, a dichroic mirror 41, relay lenses 42 and 43, a dichroic mirror 44, and a CCD lens (imaging lens) 45
And a bright spot image from the cornea CL is formed on the CCD 46. Here, CR is the cornea of the right eye EL of the subject.

In such a state, the operation control circuit 63
When the subject 4 tilts the joystick lever 12 left or right while the forehead 4 is in contact with the forehead 15, the X (left and right) direction driving device 26 is rotated forward from the output signal of the tilt sensor 12 b. Alternatively, the left eye refractive power measurement unit 16 </ b> L is controlled to move left and right by being reversely driven. The arithmetic control circuit 6
3, when the joystick lever 12 is turned around one axis or turned around the other, the Y (up / down) direction driving device 20 is driven forward or backward to rotate the left eye refractive power measurement unit 16L. Control movement up and down. Therefore, the subject 4 operates the joystick lever 12 to move the optical axis of the left eye (examined eye) EL of the subject 4 to the center (optical axis) of the prism P of the left eye refractive power measurement unit 16L. (OL). The center (optical axis OL) of the prism P coincides with the center of the CCD 46.

As described above, when the optical axis of the left eye of the subject 4 falls within a predetermined range of the center (optical axis OL) of the prism P of the left eye refractive power measurement unit 16L, a bright spot image by the alignment light beam is obtained. Falls within a predetermined range at the center of the CCD 46. When the signal of the bright spot image from the CCD 46 enters a predetermined range at the center of the CCD 46, the arithmetic control circuit 63
Of the driving device 2 in a direction in which the optical axis of the left eye corresponds to the center (optical axis OL) of the prism P of the left eye refractive power measurement unit 16L.
0 and 26 are drive-controlled. Along with such driving, the arithmetic control circuit 63 sets the allowable range in which the optical axis of the left eye of the subject 4 coincides with or substantially coincides with the center (optical axis OL) of the prism P of the left eye refractive power measurement unit 16L. When entering, the drive device 20,
26, the left eye refractive power measurement unit 16 is stopped.
The XY alignment for the left eye EL of L is completed.

When the XY alignment is completed, the joystick lever 12 is operated to move the left eye refractive power measurement unit 16L to the coarse alignment area in the Z direction.
When the left eye refractive power measurement unit 16L enters the coarse alignment area, the arithmetic and control circuit 62 performs coarse alignment in the Z direction. That is, the arithmetic control circuit 62 controls the CCD 1
The coarse alignment in the Z direction is detected from the position of the anterior segment image formed on the light receiving surface 102A of No. 02, and the driving of the Z direction driving device 24 is controlled in the direction in which the coarse alignment is completed. Z
When the rough alignment in the direction is completed, the precise Z-direction alignment is performed as described below.

(B) Precise Z-direction alignment of left eye refractive power measurement unit 16L with respect to left eye EL The arithmetic and control circuit 63 completes the XY alignment of the left eye refractive power measurement unit 16L with the left eye EL and adjusts the Z direction. When the rough alignment is completed, the driving of the Z-direction driving device 24 is controlled based on the output signal of the CCD 46. That is,
The arithmetic control circuit 63 controls the driving of the Z-direction driving device 24 so that the bright spot image on the CCD 46 becomes sharp to a certain extent,
The left eye refractive power measurement unit 16L is controlled to move in the optical axis OL direction (front-back direction). Then, the arithmetic control circuit 63
When the bright spot image of CD46 became clear to some extent, the CCD
When the detection is made from the output signal of 46, it is determined that the precise Z alignment has been completed, and the driving of the Z direction driving device 24 is stopped.

As described above, since the rough alignment in the Z direction is automatically performed, the auto alignment region in the Z direction can be widened. The operation of moving the left eye refractive power measurement unit 16L to the automatic alignment area by the operation can be easily performed. (ii). Alignment with right eye refractive power measurement unit 16R In this manner, the arithmetic and control circuit 63 performs XY alignment and Z alignment with the left eye EL of the left eye refractive power measurement unit 16L.
When the alignment is completed, the right eye refractive power measurement unit 1
The XY alignment and the Z alignment for the 6R right eye ER are performed in the same manner as the left eye refractive power measurement unit 16L. (3) Simultaneous measurement of eye refractive power in far vision state The moving lens 57 of the fixation optical system 32L is driven to advance and retreat in the optical axis O direction by a pulse motor (drive means) PMa. Moreover, the fixation target 53 is positioned at an initial position before the measurement, that is, a position where the eye refractive power measured by the refractive power measuring optical systems 33L and 33R is 0D ("0" diopter). The fixation optical system 32R has the same configuration.

The operation control circuit 63 calculates (1),
When the alignment of (2) is completed, the arithmetic control circuit 62 of the refractive power measuring optical system 33L and the refractive power measuring optical system 33R
Of the left and right refractive power measuring optical systems 33L, 33R by controlling the operation of the arithmetic control circuit 62, respectively.
Then, the fixation target light sources 51, 51 are turned on to emit infrared measurement light beams from the measurement light sources 64, 64, and the eye refractive power of the left eye EL and the right eye ER of the subject 4 is measured. Start at the same time. At this time, the measurement was performed for the left eye EL and the right eye ER
Is performed in the same manner, the measurement of the left eye EL will be described, and the description of the measurement of the right eye will be omitted. (i) Measurement of eye refractive power of left eye EL At this time, illumination light from the fixation target light source 51 of the fixation optical system 32L is projected onto the fixation target 53 as a parallel light beam via the collimators 52. Then, the fixation target light transmitted through the fixation target 53 is reflected by the reflection mirror 54, the collimator lens 55, the reflection mirror 56, the moving lens 57, and the relay lenses 58, 5.
9, reflection mirror 60, dichroic mirror 61, 3
9, the subject 4 via the objective lens 38 and the prism P
Is projected on the fundus oculi Ef of the left eye EL.

The measuring light beam from the measuring light source 64 of the left refractive power measuring optical system 33L is projected onto the fundus Ef of the left eye EL of the subject 4 via the measuring light beam projecting optical system 62. That is, the measurement light beam from the measurement light source 64 of the left refractive power measurement optical system 33L is guided to the ring target 67 via the collimator lens 65 and the conical prism 66 of the left refractive power measurement optical system 33L. Then, the ring-shaped measurement light beam transmitted through the ring target 67 is transmitted to the relay lens 68, the ring-shaped aperture 69,
The light is projected onto the fundus oculi Ef of the left eye EL of the subject 4 via the perforated prism 70 having a through hole 70a formed in the center, the dichroic mirrors 61 and 39, the objective lens 38 and the prism P.

On the other hand, a ring-shaped measurement light beam (ring-shaped target light) projected on the fundus oculi Ef of the left eye EL is reflected by the fundus oculi Ef. The reflected light is reflected by the measuring light beam receiving optical system 63, that is, the prism P of the refractive power measuring optical system 33L, the objective lens 38,
Dichroic mirrors 39, 61, perforated prism 70
A ring-shaped reflection image is formed on the CCD 46 through the through hole 70a, the reflection mirror 71, the relay lens 72, the moving lens 73, the reflection mirror 74, the dichroic mirror 44, the CCD lens 45, and the like.

The detection signal from the CCD 46 is input to the arithmetic control circuit 62 of the left refractive power measuring optical system 33L. When the detection signal from the CCD 46 is input, the arithmetic control circuit 62 determines the size of the ring-shaped reflection image formed on the CCD 46 and the size and shape of the reference ring-shaped reflection image to obtain the left eye EL. Measure the eye refractive power. At this time, the left eye EL
Because it is not known whether or not the accommodation power is working,
Since accommodation power may be acting on the left eye EL, when the eye refractive power obtained by the refraction measurement is, for example, 3D, 1.5.
D, the pulse motor PMa is driven and controlled so that the fixation target 53 comes to the position of 4.5D.
7 is driven forward and backward along the optical axis O direction.

At this position, the eye refractive power of the left eye EL is measured as described above. The measurement result at this time is, for example, 4
At the time of D, the difference between the eye refractive power 3D obtained in the previous measurement and the eye refractive power 4D obtained in the current measurement is 1D, so that it can be seen that the left eye EL has accommodation power. Therefore,
The arithmetic and control circuit 63 adds 1D to the 4D obtained in this measurement.
By adding 5D to 5.5D to drive the moving lens 57 along the optical axis O by controlling the driving of the pulse motor PMa so that the fixation target 53 comes to the position of 5.5D. The fixation target 53 is fogged to the position of 4.5D, and the eye refractive power of the left eye EL is measured again.

Further, when the measurement result is, for example, 4.25D, the difference between the eye refractive power 4D obtained in the previous measurement and the eye refractive power 4.25D obtained in the current measurement is 0.25D.
Therefore, it can be assumed that the adjustment power of the left eye EL has almost disappeared.

That is, as described above, the rough measurement is sequentially repeated, and the difference between the eye refractive power obtained by the previous measurement and the eye refractive power obtained by the current measurement is, for example, 0.25D.
When almost disappears, it can be considered that the adjustment force of the left eye EL has almost disappeared. Moreover, the fixation target 53 is set to 4.
At the position of 25D, the left eye EL is in a state where the fixation target 53 can be clearly recognized. Therefore, the position of the moving lens 57 where the fixation target 53 can be clearly recognized is the cloud fog start position of the main measurement.

Then, the arithmetic and control circuit 62 determines that the final eye refractive power based on the rough measurement is 1.5D to a value of 4.25D.
Is added to 5.75D, and the fixation target 53 is moved by moving the moving lens 57 in the optical axis direction so that the fixation target 53 comes to the position of 5.75D from the position of 4.25D.
And make a main measurement. That is, the arithmetic control circuit 62
Controls the driving of the pulse motor PMa to
Is moved along the optical axis O direction, and the fixation target 53 is moved to 4.2.
By moving the fixation target 53 viewed by the left eye EL from the 5D position to the 5.75D position, the fixation target 53 is made to fog to a blurred position, and the left refracting power measurement optical system 33L is used to make the left eye EL eye. Measure the refractive power. This measurement of the eye refraction with fog is performed several times, and the average value is used as the eye refraction of the left eye EL. (ii) Measurement of the eye refractive power of the right eye ER The eye refractive power of the right eye ER is measured simultaneously with the left eye EL in the same procedure as the measurement of the eye refractive power of the left eye EL in (i). (iii) Therefore, by simultaneously measuring the eye refractive powers of the left eye EL and the right eye ER in this manner, the left eye EL and the right eye ER are compared with the case where the eye refractive power of each eye is measured one by one. The eye refractive power of the left eye EL and the right eye ER can be accurately measured with less accommodation power of the right eye ER and the right eye ER.

That is, when the eye refractive power of the left eye EL and the right eye ER is measured for each eye, the accommodation power of the unmeasured eye of the left eye EL and the right eye ER is measured. It may affect the accommodation power of the eye. However, the left eye EL and the right eye E
By simultaneously measuring the eye refractive power of R, the accommodation power of the left eye EL and the right eye ER does not influence each other, so that the accommodation power of the left eye EL and the right eye ER is less,
The eye refractive power of the left eye EL and the right eye ER can be accurately measured. (4). Simultaneous measurement of eye refractive power after moving from inward vision (convergence) state to far vision state As described in (3) above, at the time of simultaneous measurement of eye refractive power of left and right eyes in far vision state, Although there is almost no accommodation power of the left and right eyes, after moving from the inward vision state (the state where the optical axes OL and OR are congested) to the far vision state (the state where the optical axes OL and OR are parallel). By simultaneously measuring the eye refractive power, the accommodative power of the left and right eyes can be further reduced, and more accurate eye refractive power measurement can be performed.

At the time of this measurement, first, the left eye EL shown in FIG.
And the right eye ER from a far vision state (a state where the optical axes OL and OR are parallel) to an inward vision (a state where the optical axes OL and OR are congested)
State. For example, when the left eye EL and the right eye ER in FIG. 9 are in the far vision state (the optical axes OL and OR are parallel), the subject 4
Of the left eye EL and the right eye ER are looking forward by about 75 cm, and the left eye EL and the right eye ER are in a state of convergence. (i). Measurement of eye refractive power when the optical axes OL and OR are brought into an equilibrium state from the initial convergence state <Convergence to the initial position>
Operates and controls the driving devices 28, 28 of the eye refractive power measurement units 16L, 16R via the arithmetic control circuits 62, 62, and drives the eye refractive power measurement units 16L, 16R from the state of FIG. 16 and FIG.
As shown in FIG. 7, the optical axes OL and OR are converged so as to have an angle α.

At this time, the arithmetic and control circuit 62 of the eye-refractive-power measuring unit 16L determines the CC of the eye-refractive-power measuring unit 16L.
Based on the address and contrast of the bright spot image for alignment from D46, the operation of the driving devices 24 and 26 of the eye refractive power measurement unit 16L is controlled so that the working distance to the left eye EL of the eye refractive power measurement unit 16L is constant. Is controlled so that On the other hand, the arithmetic control circuit 62 of the eye-refractive-power measuring unit 16R includes the CCD 4 of the eye-refractive-power measuring unit 16R.
The operation of the driving units 24 and 26 of the eye-refractive-power measuring unit 16R is controlled based on the address of the bright spot image for alignment from Step 6 and the contrast, and the like.
Control is performed so that the working distance to the right eye ER of 6R is constant.

When the eyesight tables 53, 53 of the eye refractive power measurement units 16L, 16R are located at the convergence position of the angle α, this position is assumed to correspond to, for example, -8D. <From the initial convergence state to the optical axes OL and OR being in the equilibrium state> From this convergence state, the arithmetic control circuit 63 controls the eye refractive power measurement units 16L and 16R to operate the arithmetic control circuits 62 and 62, and the arithmetic control circuit 62, 62, the pulse motor P
Ma and PMa are simultaneously driven to control the moving lens 57.
Is moved in the optical axis O direction, and the eye refractive power measurement unit 16 is moved.
The L, 16R fixation targets 53, 53 are clouded to a position of -6.5D obtained by adding 1.5D to -8D.

At this time, the arithmetic control circuit 63 controls the operation of the arithmetic control circuits 62, 62 so that the arithmetic control circuits 62, 62 operate.
Drives the driving devices 28 and 28 of the eye refractive power measurement units 16L and 16R, thereby controlling the eye refractive power measurement units 16L and 16R.
L and 16R are horizontally rotated in the directions of arrows B and B in FIG. The driving devices 28 by the arithmetic control circuits 62, 62,
Drive control of the eye refractive power measurement units 16L, 16L
The operation is performed until the optical axes OL and OR of R are parallel.

In addition, in such drive control, the arithmetic and control circuit 62 of the eye refractive power measuring unit 16L determines the eye refractive power based on the address and contrast of the bright spot image for alignment from the CCD 46 of the eye refractive power measuring unit 16L. The operation of the driving devices 24 and 26 of the force measurement unit 16L is controlled so that the working distance of the eye refractive power measurement unit 16L to the left eye EL is constant. On the other hand, the arithmetic control circuit 62 of the eye-refractive-power measuring unit 16R determines the driving devices 24 and 26 of the eye-refractive-power measuring unit 16R from the address of the bright spot image for alignment from the CCD 46 of the eye-refractive power measuring unit 16R and the contrast. Is controlled so that the working distance of the eye refractive power measurement unit 16R to the right eye ER is constant. <Rough measurement of eye refractive power> Then, the arithmetic and control circuit 62 of the eye refractive power measurement unit 16L includes the driving device 24,
The optical axes OL and OR are made parallel by the drive control of 26 and 28, and the movable lens 57 is moved in the optical axis direction by the drive control of the pulse motor PMa to fixate the target 53.
Is turned to the position of -6.5D, the measurement light source 64 of the refractive power measurement optical system 33L is turned on to perform a rough (coarse) measurement of the eye refractive power of the left eye EL.

At the same time, the arithmetic and control circuit 62 of the eye-refractive-power measuring unit 16R includes the driving devices 24, 26,
28, the optical axes OL and OR become parallel, and the drive control of the pulse motor PMa moves the movable lens 57 in the optical axis direction, so that the fixation target 53 moves to -6.
When the cloud is formed to the position of 5D, the measurement light source 64 of the refractive power measurement optical system 33R is turned on to perform a rough measurement of the eye refractive power of the left eye EL.

In such a measurement, assuming that the value of the refractive power of the left eye EL is, for example, -6D and the value of the refractive power of the right eye ER is, for example, -5D, this value is determined by the left and right eyes EL, E
R may also be the value when there is accommodation. (ii) Measurement of the optical axes OL and OR moving from the convergence state to the equilibrium state at the measured value position <Congestion at the measured value position>
9 individually controls the driving devices 28, 28 of the eye refractive power measurement units 16L, 16R via the arithmetic and control circuits 62, 62 to control the eye refractive power measurement units 16L, 16R.
From the state shown in FIG.
In FIG. 16B, the optical axes OL, OR
Are converged independently, and the movable lens 57 of the eye refraction measuring unit 16L is moved in the optical axis direction to fix the fixation target 53 in FIG.
The fixation target 53 of the eye-refractive-power measuring unit 16R is positioned at a position -5D in FIG. 16A. <From the convergence state to the optical axes OL and OR being in the equilibrium state> From this convergence state, the arithmetic control circuit 62 of the left eye refractive power measurement unit 16L drives and controls the pulse motor PMa of the left eye refractive power measurement unit 16L, The moving lens 57 is moved in the optical axis O direction, and the visual acuity table 53 of the eye refractive power measurement unit 16L is moved.
Is clouded to a position of -4.5D obtained by adding 1.5D to -6D. On the other hand, the arithmetic and control circuit 62 of the right eye refractive power measurement unit 16R drives and controls the pulse motor PMa of the left eye refractive power measurement unit 16R to move the moving lens 57 in the optical axis O direction. The fixation target 53 of 16R is clouded to a position of -3.5D obtained by adding 1.5D to -5D.

At this time, the arithmetic control circuit 63 controls the operation of the arithmetic control circuits 62, 62 so that the arithmetic control circuits 62, 62
Drives the driving devices 28 and 28 of the eye refractive power measurement units 16L and 16R, thereby controlling the eye refractive power measurement units 16L and 16R.
L and 16R are horizontally rotated in the directions of arrows B and B in FIG. The driving devices 28 by the arithmetic control circuits 62, 62,
Drive control of the eye refractive power measurement units 16L, 16L
The operation is performed until the optical axes OL and OR of R are parallel. In addition, at this time, as described above, each arithmetic and control circuit 62 controls the operation of the driving devices 24 and 26 so that the working distances of the eye refractive power measurement units 16L and 16R to the left eye EL and the right eye ER are respectively constant. Control so that <Rough measurement of eye refractive power> The arithmetic control circuit 62 of the eye refractive power measurement unit 16L determines that the optical axes OL and OR are parallel and that the moving lens 57 is moved in the optical axis direction by drive control of the pulse motor PMa. Moved, fixation target 53
Is turned to the position of -4.5D, the measurement light source 64 of the refractive power measurement optical system 33L is turned on to perform a rough (coarse) measurement of the eye refractive power of the left eye EL.

At the same time, the arithmetic and control circuit 62 of the eye-refractive-power measuring unit 16R determines that the optical axes OL and OR are parallel and that the moving lens 57 is moved in the optical axis direction by the drive control of the pulse motor PMa. Fixation target 53 is -3.
When the cloud is formed to the position of 5D, the measurement light source 64 of the refractive power measurement optical system 33R is turned on to perform a rough measurement of the eye refractive power of the left eye EL.

In such a measurement, assuming that the value of the refractive power of the left eye EL is, for example, -4D and the value of the refractive power of the right eye ER is, for example, -3D, this value is determined by the left and right eyes EL, E
R may also be the value when there is accommodation. (iii). Repeated Rough Measurement In this case, in the left eye EL, the value of the previously measured eye refractive power is −6D, and the value of the currently measured eye refractive power is −4D.
Since it is D, the difference between the eye refractive power of the previous time and the eye refractive power of the present time greatly increases to -2D, and accommodation power is working. Also, the right eye ER
In, the value of the eye refractive power measured last time is -5D, and the value of the eye refractive power measured this time is -3D.
Adjustment is working.

Therefore, in this case, as shown in the above (ii), the optical axes OL,
OR is independently converged, and the eye refractive power measurement unit 16L
Of the fixation target 53 by moving the moving lens 57 in the optical axis direction.
Is positioned at the position -4D in FIG. 16A, the moving lens 57 of the eye refraction measuring unit 16R is moved in the optical axis direction, and the fixation target 53 is positioned at the position -3D in FIG. 16A. Position.

From this convergence state, as shown in (ii), the moving lens 57 of the eye refractive power measuring unit 16L is moved in the optical axis direction, and the fixation target 53 is obtained by adding 1.5D to -4D. By fogging up to the position of 2.5D, rough measurement of the eye refractive power of the left eye EL is performed, and the moving lens 57 of the eye refractive power measurement unit 16R is moved in the optical axis direction to fixate the target. 53 plus -3D plus 1.5D-1.
Clouding is performed up to the position of 5D, and rough measurement of the eye refractive power of the right eye ER is performed.

In such a measurement, assuming that the value of the refractive power of the left eye EL is, for example, -3D, and the value of the refractive power of the right eye ER is, for example, -1D, this value is determined by the left and right eyes EL, E
R may be a value when the adjusting power is increased.

In this case, in the left eye EL, since the value of the eye refractive power measured last time is -4D and the value of the eye refractive power measured this time is -3D, the difference between the previous and current eye refractive powers is obtained. Are widely open at -1D, and the adjusting force is working. In the right eye ER, the value of the previously measured eye refractive power is -3D, and the value of the currently measured eye refractive power is -1D, so that the difference between the previous and present eye refractive powers is -2D. It's wide open and it's adjusted.

Therefore, in this case, as shown in the above (ii), the optical axes OL,
OR is independently converged, and the eye refractive power measurement unit 16L
Of the fixation target 53 by moving the moving lens 57 in the optical axis direction.
Is positioned at the position -3D in FIG. 16A, the moving lens 57 of the eye refraction measuring unit 16R is moved in the optical axis direction, and the fixation target 53 is positioned at the position -1D in FIG. 16A. Position.

From the convergence state, as shown in (ii), the moving lens 57 of the eye refractive power measuring unit 16L is moved in the optical axis direction, and the fixation target 53 is obtained by adding 1.5D to -3D. By fogging to the position of 1.5D, rough measurement of the eye refractive power of the left eye EL is performed, and the moving lens 57 of the eye refractive power measurement unit 16R is moved in the optical axis direction to obtain the visual acuity table 53. 0.5 obtained by adding 1.5D to -1D
Clouding is performed up to the position D, and rough measurement of the eye refractive power of the right eye ER is performed.

In such a measurement, if the value of the refractive power of the left eye EL is, for example, -2.75 D, the left eye EL
Since the value of the previously measured eye refractive power is −3D, the difference between the previous and present eye refractive powers is substantially the same as −0.25D, and the accommodation power is hardly applied. In such a measurement, the value of the refractive power of the right eye ER is, for example, −
If it is 0.75D, the value of the last measured eye refractive power of the right eye ER is -1D, so that the difference between the previous and current eye refractive powers is substantially the same as -0.25. The force is hardly working. (iV). Main measurement Therefore, in this case, the optical axis O
L and OR are independently converged, and the eye refractive power measurement unit 1
By moving the 6L moving lens 57 in the optical axis direction, the fixation target 53 is positioned at the position of -2.75D in FIG.
The moving lens 57 of the eye refractive power measurement unit 16R is moved in the optical axis direction, and the fixation target 53 is moved to −0.7 in FIG.
It is located at the position of 5D.

From this convergence state, as shown in (ii), the moving lens 57 of the eye refractive power measurement unit 16L is moved in the optical axis direction, and the fixation target 53 is added to -2.75D and 1.5D. Clouded to -1.25D position, left eye EL
The main measurement of the eye refractive power is performed, and the moving lens 57 of the eye refractive power measurement unit 16R is moved in the optical axis direction, so that the fixation target 53 is obtained by adding 1.5D to −0.75.
The cloud is made to fog to the position D, and the main measurement of the eye refractive power of the right eye ER is performed. (5) Others In the embodiment described above, the joystick lever 12 is used to drive the eye refractive power measurement units 16L and 16R.
Although drive control is performed for 24, 26, etc., the present invention is not necessarily limited to this.

For example, the Y-direction driving device 20 is not provided, and only the driving devices 24 and 26 are operated. By operating the cursor key 9, the driving device 24 is controlled to rotate in the normal direction, and the eye refractive power measuring unit 16L (16R) is controlled. ) To the back,
By operating the cursor key 11, the driving device 24 is reversely driven and controlled, and the eye refractive power measurement unit 16L (16R) is operated.
Is moved forward, and by operating the cursor key 8, the driving device 26 is controlled to rotate in the normal direction to move the eye refractive power measurement unit 16L (16R) to the left.
By operating the cursor key 10, the driving device 26 is reversely driven and controlled, and the eye refractive power measurement unit 16L (16R) is operated.
May be moved to the right. In this case, the height in the Y direction (vertical direction) is adjusted by adjusting the height of the table 1 or the height of the chair 3.

In the above-described embodiment, the distance between the eye refractive power measurement units 16L and 16R is manually driven so as to be the interpupillary distance. However, the interpupillary distance of the subject can be determined. Is not necessarily limited to only this configuration. For example, in addition to this configuration, if the interpupillary distance of the subject is known, or if there is this data, the interpupillary distance or the data is input to the arithmetic and control circuit 63 and the eye refractive power measurement is performed. The interval between the optical axes OL and OR of the units 16L and 16R may be set and controlled to the pupil distance. That is, the arithmetic control circuit 63
When the data of the interpupillary distance of the subject is input, the arithmetic and control circuits 62, 62 of the eye refractive power measurement units 16L, 16R
The operation control of the driving unit 62 and the driving devices 26 and 2 of the eye refractive power measurement units 16L and 16R
6 and controls the eye refractive power measurement units 16L and 16R.
May be set and controlled so that the interval when the optical axes OL and OR are parallel to each other becomes the interpupillary distance of the subject. [Second Embodiment] FIG. 18 shows a second embodiment. In the second embodiment, the eye refractive power measurement unit 1
A slit light beam projection optical system 110L that projects a slit light beam from a diagonal direction toward the cornea CL of the eye E is provided instead of the 6L Z alignment optical system 100L.

The slit light beam projection optical system 110L includes a light source 111, a collimator lens 112 for condensing light emitted from the light source to form a parallel light beam, and a slit hole (not shown).
And a slit plate 113 having A slit light beam is formed by the slit hole, and the slit light beam is projected obliquely toward the cornea CL of the eye E to be examined.

This slit light beam projection optical system 110L has
In the state where the rough alignment in the Z direction is completed, the slit light beam projects on the central portion of the cornea CL, and when the eye E moves away from the coarse alignment completion position, the slit light beam is projected on the cornea CL.
When the eye E approaches the rough alignment completion position, the slit light beam is projected onto the cornea CL (see FIG. 18).
On the left side (in FIG. 18). Then, rough alignment in the Z direction is detected from the projection position of the slit light beam, that is, the position of the irradiated portion of the cornea CL with the slit light beam. This detection is performed by CCD4
6 is determined based on the anterior segment image formed on the image 6.

The eye refractive power measuring unit 16R is also provided with a slit light beam projection optical system 110R (not shown) similar to the slit light beam projection optical system 110L, and its operation is the same as that of the slit light beam projection optical system 110L. Therefore, the description is omitted.

[0065]

According to the present invention, the auto alignment area in the Z direction can be widened, and the operation of moving the apparatus body to the auto alignment area can be easily performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an arrangement example of an eye refractive power measuring device according to the present invention.

FIG. 2 is an enlarged perspective view of the eye refractive power measuring device shown in FIG.

FIG. 3 is a front view of the eye-refractive-power measuring apparatus of FIG. 2;

FIG. 4 is a plan view of the eye-refractive-power measuring apparatus of FIG.

FIG. 5 is a left side view of the eye refractive power measuring device of FIG.

FIG. 6 is a right side view of the eye refractive power measuring device of FIG. 3;

FIG. 7 is a sectional view showing a support structure of the eye-refractive-power measuring unit shown in FIG. 2;

8 is an explanatory diagram of the support structure shown in FIG. 7 as viewed from below.

FIG. 9 is an explanatory diagram showing an optical system of the eye refractive power measurement unit shown in FIG.

FIG. 10 is an enlarged explanatory view of the left eye refractive power measuring unit of FIG. 7;

11 is an arrangement diagram of optical components when the optical system of FIG. 10 is viewed from the front side.

FIG. 12 is an enlarged explanatory diagram of the right eye refractive power measurement unit in FIG. 7;

13 is an arrangement diagram of optical components when the optical system of FIG. 12 is viewed from the front side.

FIG. 14 is a control circuit diagram of the eye-refractive-power measuring device shown in FIGS.

FIG. 15 is an explanatory diagram of a refractive power measurement in a far vision state of the eye refractive power measuring device shown in FIGS.

FIGS. 16 (a) and (b) are explanatory diagrams of a refractive power measurement by repeating the convergence and the far vision state of the eye refractive power measuring device shown in FIGS.

FIG. 17 is an explanatory diagram of an optical system showing a state where the eye refractive power measurement unit of FIGS. 1 to 13 is converged.

FIG. 18 is an explanatory diagram showing a second embodiment.

[Explanation of symbols]

 100L Z alignment detection optical system 101 Imaging lens 102 CCD (imaging means)

Claims (4)

[Claims] 1. An image pickup means for picking up an anterior eye from an oblique direction, and a coarse alignment detecting means for detecting a coarse alignment in a Z direction from a position of an eye image formed on a light receiving surface of the image pickup means. An alignment apparatus, characterized in that: 2. A slit light beam projection optical system for projecting a slit light beam from a diagonal direction toward an anterior eye part, an image pickup means for picking up an image of the anterior eye part from the front, and an image forming means on the light receiving surface of the image pickup means. An alignment apparatus comprising: a rough alignment detecting unit that obtains an irradiation part of an anterior eye irradiated by a slit light beam from an eye part image and detects a coarse alignment in a Z direction from a position of the irradiation part. 3. A left-eye refractive power measurement unit and a right-eye refractive power measurement unit that can be driven to approach and move away from each other at least to the right and left and that can determine the eye refractive power of the left and right eyes of the subject. An optometric apparatus, comprising: imaging means for imaging an anterior eye of an eye to be inspected from an oblique direction; and coarse alignment detection for detecting coarse alignment in the Z direction from the position of an eye image to be imaged on a light receiving surface of the imaging means. Means is provided for each measurement unit, and the coarse alignment is performed by moving each measurement unit based on the coarse alignment information detected by each coarse alignment detection means, and then precise Z-direction alignment is performed. Optometry device. 4. A left-eye refractive power measurement unit and a right-eye refractive power measurement unit that can be driven to approach and move away from each other at least to the right and left and that can determine the eye refractive power of the left and right eyes of the subject. An optometric apparatus, comprising: a slit light beam projection optical system that projects a slit light beam from an oblique direction toward an anterior eye part; an imaging unit that images the anterior eye unit from the front; and an image formed on a light receiving surface of the imaging unit. Each measurement unit is provided with a coarse alignment detecting means for obtaining an illuminated portion of the anterior eye illuminated by the slit light beam from the anterior eye image and detecting a coarse alignment in the Z direction from the position of the illuminated portion. A coarse alignment is performed by moving each measurement unit based on the coarse alignment information detected by the detecting means, and then a precise Z-direction alignment is performed. Eye apparatus.