JP5916333B2 - Z alignment device and ophthalmic device - Google Patents

Description

  The present invention relates to a Z alignment apparatus that performs rough alignment in the Z direction of an optometric unit that measures, for example, eye refractive power of an eye to be examined, and an ophthalmologic apparatus equipped with the Z alignment apparatus.

  2. Description of the Related Art Conventionally, an ophthalmologic apparatus that automatically performs alignment and then measures the eye refractive power of an eye to be examined is known (see Patent Document 1).

  Such an ophthalmic apparatus includes an optometry unit that is movably moved up and down, front and rear, and left and right with respect to a base, a measurement unit that measures eye refractive power, an alignment detection unit that detects alignment of the measurement unit with respect to the eye to be examined, and the like. Is provided.

  Further, this ophthalmic apparatus manually performs rough alignment in the XY direction and Z direction, and when the index image appears on the TV monitor, automatic alignment in the XY direction is performed.

  In recent years, it has been proposed to perform rough alignment in the Z direction automatically in an area outside the auto-alignment area. In this case, the illumination light source reflected in the anterior eye image captured from the optometry part at the stop position is proposed. The image is moved forward or rearward by about 5 mm from this stop position, and the anterior segment is imaged. The brightness of the illumination light source image reflected in the captured anterior segment image is compared, and the alignment direction is It is determined whether the current position is rearward or rearward, and the optometric part is moved in the determined direction to perform rough alignment in the Z direction.

Japanese Patent No. 3676055

  Thus, in order to determine the moving direction of the optometry part, after taking an image from the stop position, the optometry part is moved forward or backward by about 5 mm, and then the anterior eye part image is taken to obtain the anterior eye part image. For this reason, there is a problem that rough alignment in the Z direction cannot be performed quickly.

  An object of the present invention is to provide a Z alignment device and an ophthalmic device that can quickly perform rough alignment in the Z direction.

The invention according to claim 1 is an illumination light source for illuminating the anterior eye part of the eye to be examined, provided in an optometry part that can move back and forth and up and down with respect to the eye to be examined and that performs examination or measurement of the eye to be examined. An imaging device that images the anterior eye part, and a luminance detection unit that obtains the luminance of the illumination light source image of the illumination light source reflected in the anterior eye image captured by the imaging device, the luminance detection unit detects A Z alignment detection device that performs rough alignment in the front-rear direction of the optometry unit based on luminance,
When the optometry unit is located in a section from the alignment completion position in the front-rear direction to the cornea of the eye to be examined, a predetermined constant value in which the luminance of the illumination light source image captured by the imaging device is higher than a maximum or zero level Thus, the brightness of the illumination light source or the gain of the imaging device is set.

  According to the present invention, rough alignment in the Z direction can be performed quickly.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an external view of an ophthalmologic apparatus according to the present invention, wherein (a) is a side view showing a case where a display screen of a monitor unit is directed toward an examiner, and (b) is a diagram of (a). It is a rear view. (A) is a side view which shows the case where the display screen of a monitor part is orient | assigned to the subject's side, (b) is a front view of (a). (A) is the side view which turned the display screen of the monitor part to the right side, (b) is the rear view of (a). (A) is the side view which inclined the display screen of the monitor part toward the left side, (b) is a rear view of (a). It is an optical arrangement | positioning figure which showed arrangement | positioning of the optical system of an ophthalmologic apparatus. It is the block diagram which showed the structure of the control system of an ophthalmologic apparatus. It is explanatory drawing which showed the example in which the anterior eye part image was displayed on the screen of a monitor part. It is the graph which showed the relationship between the brightness | luminance of illumination light source image 61a ', 61a', and the position of an optometry part. It is the top view which showed arrangement | positioning of the optical system of the ophthalmologic apparatus of 2nd Example. It is the side view which showed arrangement | positioning of the optical system shown in FIG. It is the block diagram which showed the structure of the control system of the ophthalmologic apparatus of 2nd Example. It is explanatory drawing which showed the anterior eye part image, the bright spot image, and illumination light source image which are displayed on a display part. It is explanatory drawing which showed the anterior eye part image, the bright spot image, and the illumination light source image when the alignment of XY direction was completed.

  Hereinafter, an example which is an embodiment of an ophthalmologic apparatus equipped with a Z alignment detection device according to the present invention will be described with reference to the drawings.

[First embodiment]
1 to 4, reference numeral 1 denotes an ophthalmologic apparatus. The ophthalmologic apparatus 1 is generally composed of a base portion 2, an optometry portion 3, and a chin rest portion 4. The chin rest portion 4 is provided with a forehead pad 5 integrally therewith.

  The subject is inspected with the chin placed on the chin rest 4 and the forehead 5 on the forehead.

  A measuring unit 6 is provided inside the optometry unit 3 as indicated by a broken line in FIG. 1A, FIG. 2A, etc., and this measuring unit 6 is a known observation optical for observation and photographing. A measurement optical system (optical system) for measuring the system and refractive power is provided. By this measuring unit 6, the anterior eye part of the subject, the cornea of the eye to be examined, the fundus oculi and the like can be observed and photographed, and the fundus can be inspected.

On the side of the optometry unit 3 facing the subject, as shown in FIG. 2B and the like, a light source 61 for anterior segment illumination is arranged in a ring shape. The light source 61 is also used as a measurement light source for measuring the corneal shape.

  The base unit 2 is provided with a known drive mechanism / drive circuit 8 for driving the optometry unit 3 as indicated by broken lines in FIG. 1A, FIG.

  For example, a pulse motor (not shown) is used for the drive unit of the drive mechanism / drive circuit 8.

  The optometry unit 3 is driven in the up / down / left / right / front / rear direction with respect to the eye to be examined by operating a monitor unit described later. As shown in FIGS. 1 to 4, a liquid crystal monitor unit (display means, liquid crystal display) 10 is provided on the top 9 of the optometry unit 3.

The monitor unit 10 can be freely moved to a desired position as shown in FIGS. Further, a touch panel TC (see FIG. 6) is attached to the screen H of the monitor unit 10, and various operations can be performed by touching the touch panel TC.
[Measurement section]
An example of the optical system of the measurement unit 6 is shown in FIG . The optical system is compactly arranged in a case (not shown).

  In FIG. 5, reference numeral 41 denotes a fixation target projection optical system for projecting a visual target onto the fundus Er to fixate and cloud the eye E, 42 denotes an observation optical system for observing the anterior segment Ef of the eye E, 43 Is a scale projection optical system for projecting an aiming scale onto a CCD (imaging device) 44, 45 is a pattern light beam projection optical system (measuring optical system) for projecting a pattern light beam for measuring the refractive power of the eye E to the fundus Er, 46 is a light receiving optical system (measuring optical system) that causes the CCD 44 to receive a light beam reflected from the fundus Er, and 47 is an alignment that projects index light for detecting an alignment state in a direction perpendicular to the optical axis toward the eye to be examined. An optical projection system 48 is a working distance detection optical system for detecting a working distance between the eye E to be examined and the apparatus main body (optometry unit 3), and 49 is a signal processing unit. The pattern light beam projection optical system 45 and the light receiving optical system 46 constitute an optical system of the measuring unit 6.

  The fixation target projection optical system 41 includes a light source 51, a collimator lens 52, an indicator plate 53, a relay lens 54, a mirror 55, a relay lens 56, a dichroic mirror 57, a dichroic mirror 58, and an objective lens 59.

The visible light emitted from the light source 51 is converted into a parallel light beam by the collimator lens 52 and then passes through the indicator plate 53. The index plate 53 is provided with a target for fixing the eye E to be inspected and fogged. Target beam that is reflected by the mirror 55 passes through the relay lens 54, is guided to the main optical axis O1 of the reflecting optical system by which and the mirror 57 directed to the dichroic mirror 57 via the relay lens 56, the dichroic mirror After passing through 58, it is guided to the eye E through the objective lens 59.

  The light source 51, the collimator lens 52, and the index plate 53 constitute an index unit U10. The index unit U10 projects a fixation target by the drive motor PM1 (see FIG. 6) in order to fixate and cloud the eye E. The optical system 41 can be moved integrally along the optical axis O2.

  The observation optical system 42 includes an illumination light source 61, an objective lens 59, a dichroic mirror 58, a relay lens 62 having a diaphragm 61 ', a mirror 63, a relay lens 64, a dichroic mirror 65, an imaging lens 66, and a CCD 44.

  The illumination light beam emitted from the illumination light source 61 illuminates the anterior segment Ef of the eye E to be examined. The illumination light beam reflected by the anterior eye portion Ef is reflected by the dichroic mirror 58 through the objective lens 59, passes through the diaphragm 61 ′ of the relay lens 62, is reflected by the mirror 63, and then is relayed by the relay lens 64 and the dichroic mirror 65. And is guided to the CCD 44 by the imaging lens 66, and an anterior ocular segment image to be described later is formed on the imaging surface of the CCD 44.

  The scale projection optical system 43 includes a light source 71, a collimator lens 72 having an aiming scale, a relay lens 73, a dichroic mirror 58, a relay lens 62 having an aperture 61 ′, a mirror 63, a relay lens 64, a dichroic mirror 65, and an imaging lens 66. CCD 44 is provided.

  The light beam emitted from the light source 71 is converted into a parallel light beam when passing through the collimator lens 72, reflected by the mirror 63 through the relay lens 73, the dichroic mirror 58, and the relay lens 62 having a stop 61 ′, and the relay lens 64. An image is formed on the CCD 44 by the imaging lens 66 through the dichroic mirror 65. The video signal from the CCD 44 is input to the monitor unit 10 via the signal processing unit 49, and the anterior segment image Ef ′ is displayed on the monitor unit 10 and the alignment marks ALM 1 and ALM 2 are displayed. Note that the light sources 61 and 71 are turned off when measuring the refractive power after the alignment is completed.

  The alignment mark ALM1 indicates the range of the alignment completion area (measurable area), and the alignment mark ALM2 indicates the area range of the rough alignment.

  The pattern light beam projection optical system 45 includes a light source 81, a collimator lens 82, a conical prism 83, a ring indicator plate 84, a relay lens 85, a mirror 86, a relay lens 87, a perforated prism 88, a dichroic mirror 57, a dichroic mirror 58, and an objective lens. 59.

  The light source 81 and the ring indicator plate 84 are optically conjugate, and the ring indicator plate 84 and the pupil EP of the eye E are arranged at optically conjugate positions. The light source 81, the collimator lens 82, the conical prism 83, and the ring index plate 84 constitute an index unit U40, and the index unit U40 is driven back and forth along the optical axis O3 by a drive motor PM2 (see FIG. 6). The

  The light beam emitted from the light source 81 is converted into a parallel light beam by the collimator lens 82, passes through the conical prism 83, and is guided to the ring indicator plate 84. It passes through the ring-shaped pattern portion formed on the ring indicator plate 84 and becomes a pattern light beam. After passing through the relay lens 85, this pattern light beam is reflected by the mirror 86, passes through the relay lens 87, is reflected by the reflecting surface of the perforated prism 88, and is guided to the dichroic mirror 57 along the main optical axis Ol. After passing through the dichroic mirrors 57 and 58, an image is formed on the fundus Er by the objective lens 59.

  The light receiving optical system 46 includes an objective lens 59, dichroic mirrors 58 and 57, a hole 88a of a perforated prism 88, a relay lens 91, a mirror 92, a relay lens 93, a mirror 94, a focusing lens 95, a mirror 96, and a dichroic mirror 65. And an imaging lens 66 and a CCD 44. The focusing lens 95 is movable along the optical axis O4 in conjunction with the index unit U40.

  The reflected light beam guided to the fundus Er by the pattern light beam projection optical system 45 and reflected by the fundus Er is collected by the objective lens 59, transmitted through the dichroic mirrors 58 and 57, and the hole portion of the perforated prism 88. It is guided to 88a and passes through the hole 88a. The pattern reflected light beam that has passed through the hole 88a is transmitted through the relay lens 91, reflected by the mirror 92, transmitted through the relay lens 93, reflected by the mirror 94, transmitted through the focusing lens 95, and transmitted through the mirror 96, dichroic. The light is reflected by the mirror 65 and guided to the CCD 44 by the imaging lens 66. As a result, a pattern image is formed on the CCD 44.

  The alignment light projection system 47 includes an LED 101, a pinhole 102, a collimating lens 103, and a half mirror 104, and has a function as an alignment unit that projects an alignment index light beam toward the cornea C of the eye E. The alignment index light beam projected as parallel light toward the eye E is reflected by the cornea C of the eye E, and an alignment index image (bright spot image) T is projected onto the CCD 44 by the observation optical system 42. When the alignment index image T is positioned within the alignment mark ALM1 (see FIG. 5), it is determined that the alignment is complete.

  The working distance detection optical system 48 has a function as an alignment unit that detects the working distance between the eye E to be examined and the apparatus main body (optometry unit 3). The working distance detection optical system 48 has finite distance index projection systems 102R and 102L that project an index from a finite distance, respectively, symmetrically with respect to the main optical axis O1. The finite distance index projection systems 102R and 102L that project the index from the finite distance project the light beam from the light source 102a onto the eye E as an index light beam from the left and right sides.

The index light beams from these two finite distance index projection systems 102R and 102L are reflected by the cornea C of the eye E when the optometry unit 3 is in the auto-alignment region, and the observation optical system 42 performs CCD 44. Imaged on top. Based on the output from the CCD 44, the signal processing unit 49 displays the index images 102R ′ and 102L ′ by the index light beams from the finite distance index projection systems 102R and 102L on the monitor unit 10 (see FIG. 5). Note that the same index images as the index images 102R ′ and 102L ′ are formed on the CCD 44. When these index images have a certain positional relationship on the CCD 44, it is detected that the working distance is a distance Wo suitable for measurement.
[Signal processing section]
As shown in FIG. 6, the signal processing unit 49 includes an arithmetic control circuit (luminance detection means, control means) 110, an A / D converter 112, a frame memory 113, a D / A converter 114, and a D / A converter 115. And have.

  This arithmetic control circuit 110 has a CPU, ROM, RAM, input / output circuit, control circuit, etc. (not shown), and also serves as a drive control means for controlling the driving of each pulse motor and an arithmetic means for calculating eye characteristics. The calculation result and the like are stored in the RAM.

  The arithmetic control circuit 110 drives and controls the drive motors PM1 and PM2 and drives and controls the drive motors (moving means) 30, 23 and 27. Thereby, the apparatus main body (optometry unit 3) is driven in the X, Y, and Z directions. The arithmetic control circuit 110 is connected to a driver (not shown) in order to control lighting of the various light sources 51, 61, 71, 81, 102a and the LED 101. The drive motor 23 moves the optometry unit 3 up and down, the drive motor 27 moves the optometry head back and forth, and the drive motor 30 moves the optometry unit 3 left and right.

  The arithmetic control circuit 110 calculates the light receiving positions of the alignment index image T (bright spot image) and the index images 102R ′ and 102L ′ received by the CCD 44, and based on the calculation result, calculates the distance and direction to the alignment target position. It is what you want.

  Further, the arithmetic control circuit 110 has a function of a luminance detecting means for obtaining the luminance of the illumination light source images 61a ′ and 61a ′ shown in FIG. 7 when the optometry unit 3 is outside the alignment region, and this luminance is set in advance. The optometry unit 3 is moved forward or backward by determining whether the threshold value K is larger or smaller. The illumination light source 61, the CCD 44, and the signal processing unit 49 constitute an alignment detection device that detects rough alignment in the Z direction.

By the way, the luminance of the illumination light source images 61a ′ and 61a ′ is such that, as shown in FIG. 8, the optometry unit 3 is located in the section from the alignment completion position (Z alignment completion position) to the cornea position of the eye to be examined. When the optometry unit 3 is moved backward from this alignment completion position so that the maximum or predetermined value is constant, the brightness of the illumination light source 61 is reduced so that the luminance decreases from the maximum or predetermined value. The gain of the CCD 44 is set. This setting is performed by installing a standard model eye on the chin rest 4.
[Operation]
Next, the operation of the ophthalmologic apparatus 1 configured as described above will be described.

  First, the power source (not shown) is turned on, the subject's (patient) jaw is placed on the chin rest 4, the operation unit (not shown) is operated to turn on the illumination light source 61 of the observation optical system 42, and the fixation target is projected. The light source 51 of the optical system 41 is turned on. When the illumination light source 61 is turned on, the anterior segment Ef of the eye E is illuminated.

  By illuminating the anterior segment Ef, an anterior segment image is formed on the imaging surface of the CCD 44 of the observation optical system 42, the anterior segment image is stored in the frame memory 113, and the anterior segment image is displayed on the screen of the monitor unit 10. Ef 'is displayed.

  The LED 101 of the alignment light projection system 47 is turned on, and an alignment index light beam of a parallel light beam is projected toward the cornea C of the eye E through the pinhole 102, the collimator lens 103, and the half mirror 104. The alignment index light beam projected onto the eye E is reflected by the cornea C of the eye E, and an alignment index image (bright spot image) T is projected onto the CCD 44 by the observation optical system 42. This bright spot image T (this bright spot image T is usually outside the alignment mark ALM2) is displayed together with the anterior segment image Ef 'as shown in FIG.

  The examiner operates the touch panel TC of the monitor unit 10 so that the bright spot image T enters the alignment mark ALM2, and moves the optometry unit 3 up, down, left, and right. When the bright spot image T enters the alignment mark ALM2, auto-alignment is performed and the alignment index image T is positioned in the alignment mark ALM1 as shown in FIG. 5, and the precise alignment in the XY directions is completed.

Further, as shown in FIG. 7, an anterior eye image Ef ′ and illumination light source images 61 a ′ and 61 a ′ by the illumination light source 61 are displayed on the screen H of the monitor unit 10.

  When the XY alignment is completed, the arithmetic control circuit 110 of the signal processing unit 49 extracts the illumination light source images 61a ′ and 61a ′ from the anterior eye image Ef ′ of the frame memory 113, and the extracted light source images 61a ′, The luminance of 61a ′ is obtained, and it is determined whether or not this luminance is equal to or higher than a preset threshold value K shown in FIG.

  The threshold value K is 5.00 mm or more from the alignment completion position, and when the optometry unit 3 is moved backward, the threshold value K is less than the threshold value even if the curvature of the cornea is different. When it is located in the range of 5 mm, it is set to be equal to or greater than the threshold value even if the curvature of the cornea is different. In the range of −5 mm to 5 mm, alignment in the Z direction is possible by the index images 102R ′ and 102L ′ formed on the CCD 44.

  Therefore, the moving direction can be obtained immediately regardless of the position of the optometry unit 3.

  When the luminance of the illumination light source images 61a ′ and 61a ′ is smaller than the threshold value K, the arithmetic control circuit 110 controls the drive motor 27 to control the optometry unit because the optometry unit 3 is located behind the alignment completion position. 3 is moved forward to perform rough alignment in the Z direction. Conversely, when the luminance of the illumination light source images 61a ′ and 61a ′ is equal to or higher than the threshold value K, the optometry unit 3 is positioned in front of the alignment completion position, so the drive motor 27 is controlled to move the optometry unit 3 backward. It is moved to perform rough alignment in the Z direction.

  When entering the auto-alignment region by the rough alignment in the Z direction of the optometry unit 3, as shown in FIG. 5, the indicator images 102R ′ and 102L ′ are displayed on the screen of the monitor unit 10 by turning on the light source 102a. .

  The arithmetic control circuit 110 controls the drive motor 27 so that the index images 102R ′ and 102L ′ are in a fixed positional relationship on the CCD 44, and moves the optometry unit 3 slightly back and forth, thereby performing precise alignment in the Z direction. I do. When the precise alignment is completed, the measurement of the refractive power of the eye E is performed.

  Thus, since the movement direction of the optometry unit 3 is obtained based on the luminance of the illumination light source images 61a ′ and 61a ′ by the illumination light source 61, the optometry unit 3 is moved forward or backward. Coarse alignment can be performed quickly.

By the way, the position where the illumination light source images 61a 'and 61a' are focused differs depending on the curvature of the cornea, and the difference in focal length between the cornea curvatures R5 and R10 is 2.6 mm. As shown in FIG. Although the position where the luminance is maximum differs between R5 and R10, there is no problem by setting the threshold value K as described above.
[Second Embodiment]
9 and 10 show an ophthalmic equipment of the second embodiment. The ophthalmic equipment is tonometer measurement optical system 200 of this intraocular pressure meter, as shown in FIGS. 9 and 10, an anterior segment observation optical system 210, an XY alignment target projecting optical system 220, It has a fixation target projection optical system 230, an XY alignment detection optical system 240, a corneal deformation detection optical system 250, a slit projection optical system 260, a Z alignment light receiving optical system 270, and a Z alignment projection optical system 280. ing.

  As shown in FIG. 9, the anterior ocular segment observation optical system 210 includes an anterior ocular segment illumination light source 211 provided in front of the optometry unit 3 (see FIG. 1), an anterior ocular window glass 213, and an airflow spray nozzle 212. And a chamber glass 214, a half mirror 215, an objective lens 216, half mirrors 217 and 218, and an image sensor (light receiving means) 219 such as a CCD. The airflow spray nozzle 212 blows the air compressed by the air blowing device 310 (see FIG. 11) toward the eye E.

  As shown in FIG. 10, the XY alignment target projection optical system 220 includes an alignment light source 221 that emits infrared light, a condenser lens 222, an aperture stop 223, a pinhole plate 224, a dichroic mirror 225, The projection lens 226, the half mirror 215, the chamber glass 214, and the airflow spray nozzle 212 are provided. The dichroic mirror 225 reflects infrared light and transmits visible light.

  The fixation target projection optical system 230 includes a fixation target light source (notification means) 231, a pinhole plate 232, a dichroic mirror 225, a projection lens 226, a half mirror 215, a chamber glass 214, and an airflow spray nozzle 212. And have.

  The XY alignment detection optical system 240 includes an airflow blowing nozzle 212, a chamber glass 214, a half mirror 215, an objective lens 216, half mirrors 217 and 218, and a light receiving sensor 241. The light receiving sensor (area sensor) 241 includes a position sensor that can detect the position of the image formation point.

  The corneal deformation detection optical system 250 includes an airflow spray nozzle 212, a chamber glass 214, a half mirror 215, an objective lens 216, a half mirror 217, a pinhole plate 251, and a light receiving sensor 252.

  As shown in FIG. 9, the slit projection optical system 260 includes a slit light source 261 that emits infrared light, a condenser lens 262, a slit 263, a rectangular aperture stop 264, a half mirror 285, and a projection lens 265. Have.

  The Z alignment light receiving optical system 270 includes an imaging lens 271 and a line sensor 272.

The Z alignment projection optical system 280 includes an alignment light source 281 that emits infrared light, a condenser lens 282, an aperture stop 283, a pinhole plate 284, a half mirror 285, and a projection lens 265. .
[Control system]
FIG. 11 is a block diagram showing the configuration of the control system of the ophthalmologic apparatus 1. 219 is an image sensor (imaging device) on which an anterior segment image is formed, and the anterior eye imaged on this image sensor. The partial image is displayed on the monitor unit 10. Reference numeral 400 denotes an X motor (moving means) that moves the optometry unit 3 in the X direction (left and right direction with respect to the eye E), and 401 denotes the optometry unit 3 in the Y direction (up and down with respect to the eye E). Y motor (moving means) that is a pulse motor that moves in the direction (direction), and 402 is a Z motor (moving means) that is a pulse motor that moves the optometry unit 3 in the Z direction (front-back direction with respect to the eye E). .

  304 is an arithmetic control device (control) that controls setting of various measurement modes, lighting of the light sources 211, 221, 231, 261, and 281 based on the operation of the touch panel 302, and driving of the air ejection device 310. Means). The arithmetic and control unit 304 obtains intraocular pressure based on the pressure of the air pulse ejected by the air ejecting device 310, the amount of light received by the light receiving sensor 252, and the like.

The arithmetic and control unit 304 has a function of a luminance detection unit 304A that obtains the luminance of the illumination light source images 211a and 211a shown in FIG. 12 when the optometry unit 3 is outside the alignment region, and this luminance is preset. Whether the threshold value K is larger or smaller than the threshold value K is determined, and the optometry unit 3 is moved forward or backward. The anterior segment illumination light sources 211 and 211, the image sensor 219, and the calculation control device 304 constitute an alignment detection device that detects rough alignment in the Z direction.
[Operation]
Next, the operation of the ophthalmologic equipment constructed as described above.

  First, a power switch (not shown) is turned on. When the power switch is turned on, the anterior segment illumination light source 211 is turned on, and the anterior segment of the eye E is illuminated.

  The anterior segment image of the subject eye E illuminated by the anterior segment illumination light source 211 passes through the inside and outside of the airflow spray nozzle 212, passes through the anterior segment window glass 213, the chamber glass 214, and the half mirror 215, and the objective lens 216. Is formed on the image sensor 219 while passing through the half mirrors 217 and 218 while being focused. Then, as shown in FIG. 12, the anterior segment image Efa and illumination light source images 211a and 211a by the anterior segment illumination light source 211 are displayed on the monitor unit 10.

  On the other hand, the alignment light source 221 of the XY alignment target projection optical system 220 and the fixation target light source 231 of the fixation target projection optical system 230 are turned on, and the light of the fixation target light source 231 is pinhole plate 232, dichroic mirror 225, The projection lens 226, the half mirror 215, the chamber glass 214, and the nozzle 212 are projected onto the fundus Er of the eye E, and the eye E is fixed.

  When the alignment light source 221 is turned on, infrared light emitted from the alignment light source 221 passes through the aperture stop 223 while being focused by the condenser lens 222 and is guided to the pinhole plate 224. The light beam that has passed through the pinhole plate 224 is reflected by the dichroic mirror 225, converted into a parallel light beam by the projection lens 226, reflected by the half mirror 215, and then transmitted through the chamber glass 214 to the inside of the airflow spray nozzle 212. , XY alignment index light is formed and projected onto the cornea Ec.

  This XY alignment index light is reflected by the surface of the cornea Ec, and this reflected light beam passes through the inside of the nozzle 212, passes through the chamber glass 214 and the half mirror 215, is focused by the objective lens 216, and part thereof by the half mirror 217. Is transmitted, and a part thereof is reflected by the half mirror 218. The light beam reflected by the half mirror 218 forms a bright spot image T1 on the light receiving sensor 241.

  Further, the reflected light beam transmitted through the half mirror 218 forms a bright spot image T2 on the light receiving surface of the image sensor 219. With this bright spot image T2, the bright spot image T is displayed on the anterior segment image Ef on the monitor 10 as shown in FIG.

  The examiner performs a touch operation on a touch part (not shown) of the touch panel of the monitor unit 10 so that the bright spot image T moves to the center of the pupil image Ea displayed on the monitor unit 10. By this operation, the arithmetic and control unit 304 drives the X and Y motors 400 and 401, and the optometry unit 3 moves left and right and up and down.

  When the bright spot image T enters the coarse alignment region (not shown) by these movements, auto alignment is executed and precise XY alignment is performed.

  This precise XY alignment is performed by the arithmetic and control unit 304 driving the X and Y motors 400 and 401 based on the position of the bright spot image T1 on the light receiving sensor 241.

  When the XY alignment is completed, the illumination light source images 211a and 211a shown in FIG. 13 are extracted by the arithmetic and control unit 304, and the luminance of the extracted illumination light source images 211a and 211a is obtained by the arithmetic and control unit 304.

  The arithmetic and control unit 304 determines whether or not the obtained luminance is equal to or higher than a preset threshold value K shown in FIG. 8. When the luminance is smaller than the threshold value K, the Z motor 402 is controlled to move the optometry unit 3 forward. When the luminance is higher than the threshold value K, the Z motor 402 is controlled to move the optometry unit 3 backward.

  The alignment light source 281 of the Z alignment projection optical system 280 is turned on when entering the auto-alignment region in the Z direction by moving the optometry unit 3 forward or backward.

  By this lighting, infrared light is emitted from the alignment light source 281, and this infrared light is collected by the condenser lens 282 and reaches the aperture stop 283. Part of the infrared light that has passed through the aperture stop 283 passes through the pinhole plate 284, is reflected by the half mirror 285, and is projected onto the cornea Ec by the projection lens 265.

  The infrared light is reflected by the cornea Ec, and the reflected light is reflected by the imaging lens 271 to form a bright spot image Q on the light receiving surface of the line sensor 272. The arithmetic and control unit 304 controls the Z motor 402 based on the position of the bright spot image Q on the line sensor 272 to perform precise alignment in the Z direction. When the precise alignment in the Z direction is completed, the intraocular pressure of the eye E is measured.

  In the second embodiment, as in the first embodiment, rough alignment in the Z direction can be performed quickly.

  In the second embodiment, in the range of −5 mm to 5 mm shown in FIG. 8, alignment in the Z direction is possible depending on the position of the bright spot image Q imaged on the line sensor 272. Regardless of the position of the optometry unit 3, the moving direction can be obtained immediately.

  In the above-described embodiment, the measurement of the refractive power of the eye E, the examination of the fundus, and the optometry unit for measuring the intraocular pressure have been described. However, the measurement is not limited to these measurements and examinations, and other measurements and examinations can be performed. Alternatively, only one of the measurement optical system and the inspection optical system may be provided so that either the measurement or the inspection can be performed. Further, the optometry unit includes, for example, a fundus or a corneal endothelial cell imaging device that requires alignment in addition to the examination.

  The present invention is not limited to the above-described embodiments, and design changes and additions are permitted without departing from the spirit of the invention according to each claim of the claims.

3 Optometry section 23 Drive motor (moving means)
27 Drive motor (moving means)
30 Drive motor (moving means)
44 CCD (imaging device)
47 alignment light projection system 110 arithmetic control circuit (luminance detection means)

Claims (4)

An illumination light source for illuminating the anterior eye part of the eye to be examined, which is movable in the front and back and up and down with respect to the eye to be examined and performs examination or measurement of the eye to be examined, and imaging the anterior eye part An imaging device; and luminance detection means for obtaining a luminance of an illumination light source image of the illumination light source reflected in the anterior segment image captured by the imaging device, and the optometry based on the luminance detected by the luminance detection means A Z alignment detection device that performs rough alignment in the front-rear direction of the part,
When the optometry unit is located in a section from the alignment completion position in the front-rear direction to the cornea of the eye to be examined, a predetermined constant value in which the luminance of the illumination light source image captured by the imaging device is higher than a maximum or zero level A Z-alignment detection apparatus , wherein the brightness of the illumination light source or the gain of the imaging device is set so that   The Z alignment detection device according to claim 1, wherein the predetermined constant value is a maximum value of a luminance value of an image signal output from the imaging device.   An ophthalmologic apparatus comprising the Z alignment detection device according to claim 1.   The ophthalmologic apparatus according to claim 3, wherein the tonometer measures an intraocular pressure of an eye to be examined.