JP3269656B2 - Optometry device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometry apparatus for measuring visual acuity and refraction.

[0002]

2. Description of the Related Art A visual acuity test is usually performed at an optometry distance of 5 m. However, if a distance of 5 m cannot be obtained due to space limitations,
There has been proposed an apparatus that repeatedly reflects an optical path by a mirror to secure an optometry distance of 5 m. The optometric apparatus disclosed in Japanese Patent Application No. 3-149904, which is a patent filed by the present applicant, is also an example of such a space-saving type apparatus. Here, the light from the visual acuity table projection device stored in the table is repeatedly reflected by a mirror, and then guided upward through an opening provided on the upper surface of the table, and arranged in front of the subject's eye. An apparatus for reflecting light toward an eye to be examined by a mirror is disclosed.

[0003] Further, after light from a visual acuity chart projector arranged in a box beside the table is guided above the subject, the mirror is further reflected downward to be a mirror arranged in front of the subject. A device for reflecting light toward the subject's eye is also known. In this device, a mirror arranged in front of a subject is fixed.

[0004]

However, if the mirror that reflects toward the subject's eye is fixed as in the latter case, and if the sitting height or the like is significantly different from the standard, the subject will not be able to hold the target in an unreasonable posture. There is an inconvenience of having to watch. Further, if the height of the eye to be examined is changed due to a difference in the sitting height of the subject, the optical path from the visual acuity table projection device to the eye to be examined changes, so that the image of the optotype is a mirror arranged in front of the subject. -It moves on the plane, and finally comes off the mirror plane. For this reason, the subject cannot receive the examination while keeping his line of sight stable.

[0005] An object of the present invention is to provide a space-saving type in which a subject can view a target in a stable posture even when the height of the subject's eye changes due to a difference in the sitting height of the subject. To provide an optometric apparatus.

[0006]

In order to achieve the above object, an optometry apparatus according to the present invention has the following configuration. That is, (1) the optotype presenting means and the optotype luminous flux from the optotype presenting means
A plurality of reflective optical members for guiding
The eye to be examined visually recognizes the target through the refractive power changing means
In the optometry apparatus, the height of the eye to be examined is
First driving means for changing the height of the refractive power changing means,
The height of the subject's eye by obtaining the height of the refractive power changing means
Detecting means for detecting a target,
The final reflective optical member that reflects the light beam toward the subject's eye
Second driving means for changing the reflection angle, and change in the height of the eye to be examined
Regardless of the final, the target beam is reflected toward the subject's eye.
Visualization of the target at almost the same position on the reflective optical member
The housing based on the detection result of the detecting means.
Corresponding to the change in the visual axis direction with respect to the opening of the
And control means for controlling the operation of the two drive means .

(2) The target is provided inside the housing of the target presenting apparatus.
Indicating means and a plurality of reflective optical members,
The target beam from the step is inspected through multiple reflective optical members
In an optometry apparatus for guiding an eye to be inspected by guiding the eye,
A light detection sensor is placed on the presentation device, corresponding to the height of the eye to be examined
The position of the luminous flux from the detected object placed at
Indirectly detects the height of the eye by detecting with the detection sensor
Detecting means for detecting a target luminous flux of the reflective optical member;
The reflection angle of the final reflective optical member that reflects toward the eyes
The second driving means for changing, and the change in height of the eye to be examined
The final reflective light that reflects the target beam toward the subject's eye
In order to make the optotype visible at almost a fixed position on the
An opening of the housing based on a detection result of the detection means;
In response to a change in the visual axis direction with respect to
And control means for controlling the operation of the stage .

[0008]

[0009]

[0010]

[0011]

[0012]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall view of an example of a space-saving device in which the optical path of a target is turned back by a mirror. Reference numeral 1 denotes an optometry table. The optometry table 1 is provided with an up / down switch 2 for vertically moving the table surface. 3
Is a subjective optometry unit in which a large number of optical elements are arranged on a plurality of turret discs, these optical elements are switched to a measurement window 4 and a predetermined refractive power is applied to the eye to be examined. The subjective optometry unit 3 is supported by a support arm 5, and the support arm 5 of the subjective optometry unit 3 is configured to be able to expand, contract, and rotate by a well-known telescopic pipe mechanism. 6
Is a control box for controlling the operation of the subjective optometry unit 3. Reference numeral 7 denotes a mirror which turns the optical path of the target, and is provided by a motor 9 attached to a supporting shaft 8 for supporting the mirror via a motor pulley 10 and a belt 11.
The mirror pulley 12 rotates, and the mirror 7 is rotated.
C is a reflective or transmissive optotype presenting surface, and an optotype is formed on the optotype presenting surface by a visual acuity table projector (not shown).
Since the method of presenting the optotype itself is not related to the present invention, it will not be described any further, but the optotype can be presented by another method.

FIG. 2 shows an optometry table 1 and a supporting arm 5.
FIG. 4 is a view including a partial cross section for explaining the structure of FIG. 13
Reference numeral 16 denotes a fixed foot fixed to the base 14 of the optometry table, and a guide roller 16 is provided between the fixed foot 13 and the movable cylinder 15.
Is interposed. A pulse motor 17 is fixed to the base 14, and a shaft 18 on which a feed screw is cut is fixed to a rotation shaft of the pulse motor 17. The rotation of the shaft 18 causes the nut 19 of the moving tube 15 to move up and down, so that the moving tube 15 and the optometry table surface are guided by the guide roller 16 and move up and down. Reference numeral 20 denotes a potentiometer, 21 denotes a moving axis of the potentiometer, and the potentiometer 2
The height position of the optometry table surface can be known from the resistance value indicated by 0. Support arm 5 for subjective optometry unit 3
Indicates that the pipe 23 is fitted to the guide cylinder 22 and the pipe 2
3 receives an upward force by the spring 24 and stably holds the subjective optometric unit 3. A potentiometer 25 is attached to the surface of the optometry table.
The resistor 25 detects a resistance value corresponding to the amount of movement of the potentiometer moving shaft 26 fixed to the pipe 23. The detected value of the potentiometer 25 is converted to the height position of the subjective optometric unit 3 with respect to the table surface, that is, the measuring window. 2
Reference numeral 7 denotes a lock knob which restricts vertical movement and rotation of the support arm 5.

FIG. 3 is an electric block diagram of the above apparatus. A signal from the up / down switch 2 for raising and lowering the optometry table surface is input to the microcomputer 31 via the input circuit 30. The microcomputer 31 sends a signal to the motor driver 33 via the output circuit 32 to drive the motor 17 to move the surface of the optometry table 1 up and down. The movement axis 21 of the potentiometer moves up and down with the vertical movement of the optometry table surface, and the potentiometer 2
The resistance value indicated by 0 changes. The resistance value of the input circuit 34
Is input to the microcomputer circuit 31 via the.

The potentiometer 25 detects a resistance value corresponding to the amount of movement of the potentiometer moving shaft 26,
This is input to the microcomputer circuit 31 via the input circuit 35. The relationship between the detected value of the potentiometer 20 and the height from a reference plane (for example, the surface on which the optometry table surface is installed), and the detected value of the potentiometer 25 and the optometric table from the subjective optometry unit (measurement window). Since the distance relationship to the bull surface is stored in the microcomputer circuit 31, the microcomputer circuit 31 uses the subjective optometry unit (measurement) based on the detection results of the potentiometers 20 and 25. The distance from the window 3 to the reference plane (for example, the installation surface of the optometry table surface) is calculated. When the position of the subjective optometry unit (measurement window) 3 moves, it is necessary to rotate the mirror 7 in the direction of the arrow in order to guide the luminous flux of the optotype on the optotype presenting surface C to the subject's eye. Since the relationship between the height of the subjective optometry unit (measurement window) 3 and the preferable rotation angle of the mirror 7 can be determined on a one-to-one basis by basic knowledge of geometrical optics, this data is stored in the microcomputer 31. The microcomputer circuit 31 stores the information based on the distance from the subjective optometry unit (measurement window) 3 to the reference plane (for example, the installation surface of the table for optometry). A signal is sent to the pulse motor driver 36,
The pulse motor 9 is driven to rotate the mirror 7 at a predetermined angle.

In the above embodiment, the height of the optometry table surface and the height of the subjective optometry unit are moved.
Either the optometry table surface or the subjective optometry unit may be fixed.

[0017]

Embodiment 2 In addition, Japanese Patent Application No. Hei.
As disclosed in the specification of US Pat.
The mirror 7 may be moved up and down by a method in which the support shaft 8 itself is expanded and contracted like the support shaft 5 of the subjective optometry unit, and the light beam of the optotype on the optotype presenting surface C may be guided to the eye to be examined.

In the first embodiment, the optotype presenting surface and the mirror 7 are arranged outside the optometry table 1 for convenience of explanation.
As described in the specification of Japanese Patent Application Laid-Open No. H10-260, there is also used a type that is configured integrally with the optometry table 1 by utilizing repetitive reflection by a mirror disposed inside the optometry table 1. Clearly, it can be applied.

[0019]

Third Embodiment In the first and second embodiments, the case where the vertical movement of the subjective optometric unit is detected by the detecting means provided on the subjective optometer has been described. In the present embodiment, the vertical movement is detected. This is a device that detects on the target presenting side. FIG. 4 is a schematic side view showing an optometric apparatus including a subjective optometric apparatus and an optotype presenting apparatus. Reference numeral 40 denotes a subjective optometry apparatus main body, and reference numeral 41 denotes an optometry table. The table surface of the optometry table 41 is configured to be vertically movable. Reference numeral 42 denotes a subjective optometric unit. The subjective optometric unit 42 is supported by a support arm 43 of a telescopic mechanism so as to be vertically movable. Reference numeral 44 denotes a control for controlling the subjective optometry unit 42 and the like.
E is the eye to be examined. A light-diffusing reflecting member 45 is attached to the subjective optometry unit 42. The reflection member 45 preferably has a higher reflectance than the exposed member of the subjective optometry unit 42. For example, in the case of a manual phoropter, it is easy to detect the reflection member 45 by, for example, providing it at the top of the CYL lens switching knob located at the lowest position. To Reference numeral 46 denotes an optotype presenting apparatus. The optotype presenting apparatus is provided with a rectangular opening 47 so that the eye E can see an internal optotype through the opening 47. An optotype projection unit (not shown) is provided inside the optotype presenting apparatus, and projects the optotype on the screen S. The reflected light from the screen S is reflected by a reflection mirror M or the like (other mirrors are omitted).
It passes through the opening 47 toward the subject's eye.

The mirror 48 is configured to be rotatable about a mirror shaft 49 in the direction of the arrow. 50 is a motor,
A cam 51 is attached to a rotating shaft of the motor 50. Since the mirror 48 is urged by a spring, the mirror driving plate attached to the mirror 48 comes into contact with the cam 51 to transmit the operation of the cam 51 to the mirror 48 and change its angle. Therefore, even if the visual axis direction with respect to the opening 47 changes due to a change in the position of the eye E, the subject can see the optotype at the center of the mirror 48. 52 is an LED attached to the optotype presenting device 46,
The spread angle of the infrared light emitted from D is set so as to cover the vertical movement width (about 30 cm) of the subjective optometry unit. The light image on the reflecting member 45 is formed on the CCD sensor 54 in the detection direction by the imaging lens 53 attached to the target presenting device 46. Reference numeral 55 denotes a cylindrical lens for expanding an image in a direction orthogonal to the detection direction of the CCD sensor 54.
The reflection member 45 and the detection surface are set to about 1450 mm, and the CCD sensor 54 can be detected with a commercially available length (about 15 mm). The signal from the CCD sensor 54 is sent to the microcomputer 61 via the input circuit 60 as shown in the block diagram of FIG. The microcomputer 61 subtracts the detection signal when the LED is turned off (the detection signal before the LED is turned on after the start of the position detection) from the detection signal to remove the influence of disturbance light, and performs subjective optometry based on the extracted signal. Detect unit height. The microcomputer 61 obtains the detection position of the CCD sensor as the distance from the reference position of the subjective optometry unit, and obtains the rotation angle from the reference angle of the mirror. When the distance between the mirror and the subjective optometry unit is L and the subjective optometry unit is moved upward by d, the rotation angle of the mirror from the reference angle is about 1
/ 2 × tan -1 (d / L). Microcomputer
The motor 61 controls the motor driver 62 to drive the motor 50 to change the angle of the mirror 48.

In the case of a temporary frame test or the like, the subjective optometry unit is rotated and placed in the storage position. At this time, the subjective optometry unit is raised to the highest position so as not to interfere with other devices. In order to prevent the change of the mirror angle from following the rise of the subjective optometry unit, the mirror angle may be changed by detecting the vertical movement only when a predetermined switch is pressed ( When the switch is not pressed, the angle is maintained at the immediately preceding angle. When the subjective optometry unit is raised above a predetermined value (or at a position where light from the LED does not enter the CCD sensor 54), the mirror angle is set to the The predetermined angle stored in the computer 61 is set. As the angle, an angle just before the subjective optometry unit is elevated or an angle when a target (for example, a distance vision chart) always used in normal optometry is selected. The reference angle of the mirror 48 is calibrated at the time of installation and stored as an angle with respect to the subjective optometry unit of a specific height, so that it is more accurate. As a simple calibration, the median value of the mirror angle when the subjective optometry unit is placed at the highest position and the mirror angle when the subjective optometry unit is placed at the lowest position can be used as the reference angle.

As will be apparent to those skilled in the art, the above embodiments can be variously modified, and such modifications are also included in the present invention as long as they are the same as the technical idea of the present invention.

[0023]

According to the present invention, the difference in the sitting height of the subject can be reduced.
Subject is stable against changes in eye height due to
The optotype can be seen in the posture. Also, the final reflective light
Because it is only necessary to change the reflection angle of the scientific member,
This is a very advantageous configuration.

[Brief description of the drawings]

FIG. 1 is an overall view of an example of a space-saving device in which an optical path of a target is turned back by a mirror.

FIG. 2 is a view including a partial cross section for explaining the structures of an optometry table 1 and a support arm 5;

FIG. 3 is an electric block diagram of the device.

FIG. 4 is a schematic side view showing an optometry apparatus according to a third embodiment.

FIG. 5 is a block diagram showing mirror control by a motor according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 optometry table 3 subjective optometry unit 5 support arm 7 mirror 8 support shaft 9 motor 10 motor pool 11 belt 12 mirror pool

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-136632 (JP, A) JP-A-63-194633 (JP, A) Actually open JP-A-63-159709 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) A61B 3/00-3/16 Practical file (PATOLIS) Patent file (PATOLIS)

Claims (2)

(57) [Claims] 1. A visual target presenting means and visual recognition from the visual target presenting means.
Multiple reflective optical members for guiding the luminous flux to the eye to be examined
It is located inside the body, and the subject's eye
In the optometry device that visually recognizes the
Driving means for changing the height of the refractive power changing means by means of
And obtaining the height of the refractive power changing means.
Detecting means for detecting the height of the eye; and
The final reflective light that reflects the target beam toward the subject's eye
A second driving means for changing the reflection angle of the structural member;
The target beam is reflected toward the subject's eye regardless of the change
The visual target at almost the same position as the final reflective optical element
In order to function, based on the detection result of the detection means,
Corresponding to a change in the visual axis direction with respect to the opening of the housing.
And a control unit for controlling the operation of the second driving unit . 2. An optotype presenting means inside an enclosure of an optotype presenting apparatus.
And a plurality of reflective optical members, and
Guide light beam to the subject's eye via multiple reflective optical members
An eye examination apparatus for examining an eye to be examined,
The light detection sensor is placed on the
The position of the light beam from the object to be detected
Detector that detects indirectly the height of the eye by detecting with the sensor
A step, and a target light beam of the reflective optical member is directed to the eye to be inspected.
The reflection angle of the final reflective optical member
The second driving means and the target, irrespective of a change in the height of the subject's eye;
The final reflective optical member that reflects the light beam toward the subject's eye
In order to make the target visible at a substantially constant position,
Based on the detection result of the means,
The operation of the second driving means in response to a change in the visual axis direction
An optometry apparatus , comprising: a control unit configured to control the optometry.