JPH07136113A - Subjective type optometric apparatus - Google Patents

Abstract

PURPOSE:To enable accurate flapping action with a simple mechanism by driving the correction of the width of an eye of a unit for measurement with a different system of drive mechanism from a flapping action therefor. CONSTITUTION:A shaft 2 is supported on a hanger plate 1 for fixing a measuring lens unit and made to pierce a slide base 3 to fix a shaft link plate 4. The other end of a shaft 5 fixed on the shaft link plate 4 is fixed on the hanger plate l and the shaft 5 serves as moving shaft to flap the lens unit. A screw linked to a drive motor 10 for flapping is engaged with an L-shaped plate 8. By the driving of the motor 10, the screw 11 is turned to move the L-shaped plate 8 longitudinally and the shaft of a vertical motion knob 6 moves on a circular are centering the shaft 2. Then. the shaft link plate 4 turns on the shaft 2 so that left and right hanger plates are flapped in the opposite direction to each other. Screws 16 and 17 are linked to the shafts of drive motors 14 and 15 and engaged with a female thread of the slide base 3. Thus, by the driving of the motors, the slide base 3 is moved in the direction of the shaft of a fixed guide 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subjective optometry apparatus capable of measuring refractive power for distance and near use.

[0002]

2. Description of the Related Art In a so-called subjective optometry apparatus, it is necessary to align the optical axis of a measuring lens with the visual axis of a subject. In the near vision measurement, the interpupillary distance becomes shorter than in the far vision measurement, but in a device without a special mechanism for this adjustment, it is adjusted exclusively by the experience of the examiner. In order to improve this point, a mechanism described in Japanese Patent Publication No. 56-34722 is proposed. According to this mechanism, after adjusting the inspection window of the measurement unit in the distance vision state, when the tilt lever is rotated, the interval of the inspection window of the measurement lens unit in the near vision is corrected by the cam mechanism.

[0003]

However, like the device of Japanese Examined Patent Publication No. 56-34722, it is extremely complicated to mechanically combine the distance correction of the lens unit for measurement and the tilt of the lens unit. It has the disadvantage of requiring a mechanism. In addition, there is a problem that it is difficult to make a mechanism that accurately matches the difference in the interpupillary distance of the subject due to manufacturing technology limitations. In view of the problems of the above-described conventional apparatus, it is an object of the present invention to provide an subjective optometry apparatus that has a simple mechanism and can be accurately swung.

[0004]

In order to solve the above problems, the present invention is characterized by having the following configuration. (1) In a subjective eye examination apparatus for measuring distance and near refractive powers of an eye to be inspected, a pair of suspension plates holding left and right measurement lens units, and an inspection of the left and right measurement lens units A moving block that moves the suspension plate in the left-right direction to adjust the spacing between windows, a block drive mechanism that moves the movement block, and a suspension lens and a measurement lens unit fixed to the movable block. A swirl swivel shaft that is a swivel shaft for swirling motion, a shaft connecting member attached to the swirl swiveling shaft, a moving shaft that is fixed to the shaft connecting member and the suspension plate and that moves during the swirling motion, and the moving shaft is moved. A moving axis drive means for rotating the suspension plate about the tilt rotation axis, a detecting means for detecting a distance pupil distance for the eye to be inspected, and a near distance for inputting or detecting a near distance. Deciding factor And a control means for controlling the movement axis driving means and the block driving means based on the obtained distance-use pupillary distance and the near-distance distance, and for controlling the movement.

(2) The moving shaft driving means of (1) includes a relay shaft provided on the shaft connecting member, a moving plate for pushing the relay shaft for moving the relay shaft in the front-rear direction, and the moving plate. And a drive motor for moving.

(3) In the subjective optometry apparatus of (2), the relay shaft and the shaft connecting member can be relatively moved up and down by a feed screw mechanism, and the relay shaft and the shaft connecting member are moved up and down relatively. The hanging plate is moved up and down.

(4) The detecting means for detecting the distance between the pupils for far vision of the eye to be inspected in (1) is to detect the distance between the inspection windows of the measuring lens unit, and the distance refraction of the eye to be inspected. The feature is that the distance between the inspection windows at the time of force measurement is regarded as the distance pupil distance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the structure of a lens unit suspension portion of the subjective optometry apparatus of this embodiment. Reference numeral 1 is a suspension plate for fixing a measurement lens unit (not shown). A shaft 2 is supported on the suspension plate 1, and the shaft 2 serves as a center of rotation when the lens unit is tilted. Axis 2 is slide stand 3
Through, and is rotatable and vertically movable with respect to the slide base 3. A shaft connecting plate 4 is fixed to the shaft 2. The other end of the shaft 5 fixed to the shaft connecting plate 4 is fixed to the suspension plate 1, and the shaft 5 serves as a moving shaft for tilting the lens unit. The vertical movement knob 6 is screwed into a female screw provided on the shaft connecting plate 4, and the load of the suspension plate 1 is applied to the sliding plate 7 on the slide base 3. Vertical movement knob 6
The rotation of the shaft connecting plate 4 and the hanging plate 1 moves up and down with respect to the slide base 3. Reference numeral 8 denotes an L-shaped plate. The L-shaped plate 8 is provided with an elongated hole 9, and the shaft of the vertical movement knob 6 is inserted into the elongated hole 9. Since the long hole 9 is long in the left-right direction, the vertical movement knob 6 can also be moved left and right.

The L-shaped plate 8 is threaded, and the screw 11 connected to the tilting drive motor 10 is engaged with the L-shaped plate 8.
The tilting drive motor 10 is fixed to a fixing bracket (not shown), and the screw 11 is rotated by driving the motor.
The L-shaped plate 8 moves back and forth (in the direction of the arrow). Since the vertical movement knob 6 is passed through the elongated hole 9 of the L-shaped plate 8, the shaft of the vertical movement knob 6 moves on the slide plate 7 and the circular arc centered on the shaft 2 as the L-shaped plate 8 moves back and forth. Move up. The shaft connecting plate 4 engaged with the vertical movement knob 6 rotates about the shaft 2, and the left and right suspension plates 1 are placed in opposite directions. Reference numeral 12 is a micro switch for detecting the initial position of the tilting mechanism. The slide base 3 is slidable in the axial direction of the fixed guide 13.
Drive motors 14 and 15 are fixed to a fixed bracket (not shown) together with a fixed guide 13 for sliding. Screws 16 and 17 are attached to the shafts of the drive motors 14 and 15, respectively.
, And the screws 16 and 17 are engaged with the female screws of the slide base 3, so that the slide base 3 is driven by the motor.
Can be moved in the axial direction of the fixed guide 13. 18
Is a micro switch for detecting the initial position of the slide base 3.

FIG. 2 is a block diagram of an electric system relating to the tilting mechanism of this embodiment. 20 and 21 are drive motors 1 for tilting
0 and the motor drive circuits for the drive motors 14 and 15, 22
-24 are CPU, RAM, and ROM, respectively. The operation panel 25 is composed of a pupillary gap changeover mode switch 26 and its indicator 27, an addition degree changeover mode switch 28 and its indicator 29, numerical value changeover switches 30 and 31, a numerical value display section 32 and the like.

The operation of the embodiment having the above configuration will be described. First, the eye to be inspected and the measurement window of the measurement unit are roughly aligned. The examiner operates the vertical movement knob 6 to move the suspension plate 1 up and down with respect to the slide table 3 to match the height of the eye to be inspected with the height of the measurement window. By turning on a power switch (not shown), the CPU 22 drives the drive motors 14 and 15
Is output, and the drive motors 14 and 15 are rotated via the motor drive circuit 21. The screws 16 and 17 directly connected to the shaft of the drive motor rotate, and the slide base 3 moves in the direction in which the space is widened. When the slide base 3 hits the micro switch 18 and detects the initial position, the CPU 2
2 interrupts the generation of the motor rotation signal.

Further, the tilting drive motor 10 is rotated via the motor driving circuit 20 and the screw 11 is rotated to move the L-shaped plate 8 backward until the micro switch 12 is turned on, and the initial position of the tilting is set. Do (in this case,
Unlike the figure, the microswitch 12 is assumed to be located behind the L-shaped plate 8). Next, the eye to be inspected is placed in the distance vision state, and the measurement window of the measurement unit is aligned with the eye to be inspected. To change the distance between the measurement windows, the PD switch 26 on the operation panel 25 of FIG. 2 is pressed. PD switch 26
When is pressed, the indicator 27 lights up, and the display unit 32 displays the PD
Switch to display. By pressing the numerical value changeover switch 30 in this state, the CPU 22 rotates the drive motors 14 and 15 by a predetermined amount. The motor rotation amount is stored in the RAM 23, and the numerical value converted into the PD is displayed on the display unit 32. When the alignment is completed in this way, the interpupillary distance in the distance vision state can be obtained. Next, when the examiner presses the addition power switch 28 to perform the near vision measurement, the indicator 29 lights up, and the display unit 32 displays a predetermined near vision distance, that is, the distance b + c in FIG. Three
5 cm) is displayed. The CPU 22 calculates the tilt angle θ and the correction amount e on one side of the interpupillary distance as described below.

FIG. 3 is a diagram for explaining the principle of the calculation. The distance from the eyeball turning point 44 to the corneal vertex 45 (corneal vertex position in far vision), the distance from the corneal vertex 45 to the rotation center 46 of the axis 2, If the distances from the rotation center 46 to the near fixation point 47 are a, b, and c, and the interpupillary distance in distance vision is d, the inclination angle θ of the suspension plate 1 is expressed by the following equation.

[Equation 1] Further, the correction amount e on one side of the eye width at this point is expressed by the following equation.

[Equation 2] The CPU 22 executes the calculation to obtain the inclination angle θ of the suspension plate 1, and further obtains from the ROM 24 the rotation speed of the drive motor 10 for raising θ. The tilt drive motor 10 rotates by an amount of rotation determined by a signal from the drive circuit 20.
The screw 11 rotates as the tilt drive motor 10 rotates, and the L-shaped plate 8 moves forward. The vertical movement knob 6 and the shaft connecting plate 4 rotate forward around the shaft 2 to tilt the tilt angle θ. Further, the CPU 22 obtains the one-sided correction amount e of the interpupillary distance based on this tilt angle by using the equation 2, and further converts it into the rotation amounts of the drive motors 14 and 15. Drive motor 14,
The slide base 3 is moved inward by the rotation of 15. After matching the optical axis and the visual axis of the inspection lens in this way,
The near power is measured. In the above embodiments, the near distance is fixed, but it is possible to change it.
In this case, the near distance may be input or detected. The left and right movements of the lens unit are driven by the drive motor 1.
Two of 4, 15 were used, but one motor can also be used.

[0014]

As is clear from the above description, according to the present invention, the mechanism is simplified by realizing the interpupillary correction and the tilting motion, which were combined in the tilting mechanism, by the operations of different systems. be able to.

[Brief description of drawings]

FIG. 1 is a schematic view showing the structure of a lens unit suspension portion of the subjective optometry apparatus of this embodiment.

FIG. 2 is a block diagram of an electric system related to a tilting mechanism.

FIG. 3 is a diagram illustrating the principle of calculation according to the present embodiment.

[Explanation of symbols]

 1 Suspension plate 2 Axis 3 Slide stand 4 Axis connecting plate 5 Axis 6 Vertical movement knob 7 Sliding plate 8 L-shaped plate 9 Oblong hole 10 Drive motor 11 for fanning 11 Screw 12 Micro switch 13 Fixed guide 14, 15 Drive motor 16, 17, Screw 18 micro switch

Claims (4)

[Claims] 1. A subjective eye examination apparatus for measuring distance and near refractive powers of an eye to be inspected, a pair of suspension plates for holding left and right measurement lens units, and the left and right measurement lens units. Moving block for moving the hanging plate in the left-right direction to adjust the interval between the inspection windows, a block drive mechanism for moving the moving block, and a measuring lens fixed to the hanging plate and the moving block. A tilting rotary shaft that is a rotary shaft for the tilting motion of the unit, a shaft connecting member attached to the tilting rotating shaft, a moving shaft that is fixed to the shaft connecting member and the suspension plate and moves during the tilting motion, and the moving shaft. Moving shaft driving means for rotating the suspension plate about the tilt rotation axis, detecting means for detecting the distance pupillary distance for the eye to be inspected, and a near distance inputting or detecting a near distance. Working distance A subjective type comprising: a determining means; and a control means for controlling the movement axis driving means and the block driving means based on the obtained distance-use pupillary distance and the near-distance distance to execute agitation. Optometry device. 2. The moving shaft driving means according to claim 1, wherein the relay shaft provided on the shaft connecting member, a moving plate for pushing the relay shaft for moving the relay shaft in the front-rear direction, and the moving plate. A subjective optometry apparatus, comprising: a drive motor for moving. 3. The subjective optometry apparatus according to claim 2, wherein the relay shaft and the shaft connecting member can be relatively moved up and down by a feed screw mechanism, and the relay shaft and the shaft connecting member are moved up and down relatively to each other. A subjective optometry apparatus for moving a hanging plate up and down. 4. The detecting means for detecting the distance between the pupils for far vision of the eye to be inspected according to claim 1 is for detecting the distance between the inspection windows of the measuring lens unit, and the distance refractive power of the eye to be inspected. An subjective optometry apparatus, wherein the distance between examination windows at the time of measurement is regarded as a distance pupil distance.