JP2580635Y2 - Storage mechanism of optotype presenting device of 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 a storage mechanism of an optotype presenting apparatus of a subjective optometric apparatus for performing measurement using a short-distance optotype.

[0002]

2. Description of the Related Art In general, in a subjective optometry apparatus capable of measuring distance and near distances, a short distance target for near distance measurement is presented separately from a target presenting apparatus for distance measurement. A device is provided.

Conventionally, as a device for presenting such a short-distance target, a short-distance target surface is vertically mounted on a support rod extending horizontally in the forward direction of a subject from a measurement head unit having a measurement lens for optometry. A device in which a target presenting device is suspended and fixed in such a manner is known (for example, Japanese Utility Model Laid-Open No. 3-16903).
In this optotype presenting device, the support rod is configured to be rotatable about the length direction, and the optotype presenting device is located below the support rod at the time of near measurement, but at the time of distance measurement. Then, the optotype presenting device is moved and fixed to an upper position which does not obstruct the distance measurement.

[0004] An optotype presenting apparatus is suspended from a measuring head section provided with a measuring lens for optometry to a support rod extending horizontally in the forward direction of the subject so that a short-distance optotype surface becomes vertical. In addition, at the position of the support rod, near the measuring head, a rotating portion is provided that can bend the support rod upward, so that the distance between the support rod and the target presenting device can be obstructed, and the support rod is held at the rotating portion. A device configured to be bent upward and held is known (for example, Japanese Utility Model Laid-Open No. 2-5591).
No. 5).

[0005]

However, in the former case of the above-mentioned conventional device, it is necessary to provide a rotation driving means for rotating the support rod, and there is a problem that the structure becomes complicated.

[0006] In the latter, when the support rod is rotated upward by the rotating part and held, the weight of the support rod and the optotype presenting device is applied to the rotating part, and the rotating part is easily broken. In addition to the problem, if any external force is applied to the support rod or the optotype presenting device to cause the optotype presenting device and the support bar to rotate and drop downward, there is a problem that it is extremely dangerous. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a storage mechanism for a target presenting apparatus of an optometry apparatus which has a simple structure and is safe.

[0008]

According to the present invention, in order to solve the above-mentioned problems, in a storage mechanism of an optotype presenting apparatus of an optometric apparatus for performing measurement using a short-distance optotype, a measuring head is held at one end. a measuring arm portion connected to the strut at the other end, attached to said one end of the measuring arm, the measuring
A first position on the median plane of the subject when facing the front of the measurement head portion, with a center on the one end side of the arm portion , and a second position substantially parallel to and close to the measurement arm portion A support rod that rotates horizontally between, and a plane of a built-in short-distance target that is held at one end by the support rod, and that the support rod is in the vertical direction when the support rod is at the first position, is that the support rod is receiving mechanism optotype presenting apparatus optometric apparatus characterized by having a target display portion which is positioned substantially horizontally when in the second position is provided.

[0009]

When the distance measurement is performed, the support rod is located at the second position, and the target presents a built-in short-distance target held by the support rod.
The part is positioned such that the plane of the short-range target is substantially horizontal to the support bar. In this state, the support rod and the target
The part is compactly stored.

Next, at the time of near vision measurement, the support rod is rotated and held at the first position, and the optotype presenting section is positioned such that the plane of the short-distance optotype is in the vertical direction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing the optotype presenting apparatus 1 and the near rod 2. The optotype presenting apparatus 1 includes an optotype driving section 3 having a built-in motor driving apparatus, and an optotype control section having a plurality of near targets.
(Optotype presenting unit) 4. The near rod 2 is a rod-shaped body having a rectangular cross section that penetrates the optotype driving unit 3, and the distance (cm) and the diopter value (D) are displayed on the side surface. The near rod 2 is detachably fixed by a screw 7 to a mounting unit 6 rotatably provided at a distal end of a measurement arm 5 (described later in FIG. 2). The mounting unit 6 has a structure capable of rotating and moving in a horizontal plane about the tip of the measuring arm 5.
Thereby, the near rod 2 is moved from the use position where the near measurement is performed to the retracted position where the near rod 2 is compactly stored. The detailed structure of the mounting unit 6 will be described later.

The optotype driving section 3 has a built-in motor driving apparatus, and a control signal is supplied to the motor driving apparatus so that the optotype driving section 3 slides along the near rod 2 within a predetermined range. Then, the target control unit 4 is positioned at a predetermined position of the near rod 2. The optotype driving section 3 is provided with a rotating section 3a, and the optotype control section 4 is configured to be manually rotated between the storage position and the measurement position around the rotating section 3a. The storage position is a position where the optotype control unit 4 is substantially parallel to the near rod 2, and the measurement position is such that the near optotype built into the optotype control unit 4 is in the longitudinal direction of the near rod 2. It is a position that makes a right angle. The structure of the rotating unit 3a will be described later. The optotype control unit 4 has a built-in motor drive device and is configured to display an optotype selected from a plurality of optotypes in accordance with a control signal.

FIG. 2 is a front view showing the overall configuration of the subjective optometry system including the optotype presenting apparatus 1. Measuring head 8
Is a measuring lens unit 9 including two left and right lens units 9a and 9b, and a left and right lens unit 9a and 9b.
9b to adjust the distance between the pupils 9b to the interpupillary distance (PD) of the subject. Measuring head 8
Is suspended below the distal end of the measurement arm 5, and the measurement lens unit 9 switches the lens system built therein to provide a lens of a desired refractive index in front of the subject. Is what you do.

The measuring arm 5 is supported by the head support 14 so as to be vertically movable and rotatable in a horizontal plane. The head support unit 14 is set upright behind the optometry table 15 in which a display device is built, and its operation is controlled by a control device. Further, on the optometry table 15, a movable table 1 slidable in the left-right direction.
6 are provided. For example, an objective optometry apparatus or the like can be placed on the movable table 16, and the objective table can be measured by sliding the movable table 16 to the center position of the optometry table 15 prior to the subjective measurement. Under the optometry table 15, a base 17 incorporating a control device is arranged. The control device supplies drive current to various motors, solenoids, and the like according to input information from various sensors, micro switches, and input devices.
Information to be notified to the measurer is sent and displayed on the display device. The control device will be described later with reference to FIG. FIG. 2 shows the optotype presenting apparatus 1 in a storage position where the optotype control section 4 is folded so as to be parallel to the near rod 2. FIG. 2 shows the state of the near bar 2 after the near bar 2 itself has been rotated from the use position to a position parallel to the measuring arm unit 5 (retreat position) around the tip of the measuring arm unit 5. Is shown.

FIG. 3 is a side view of a subjective optometry system including the target presenting apparatus 1, and FIG. 4 is a plan view thereof.
In both figures, the state after the near rod 2 is rotated from the retracted position around the distal end portion of the measuring arm 5 to the use position extending in the forward direction (left direction in FIG. 3) of the subject. It is shown. In addition, both figures show the optotype presenting apparatus 1 in which the optotype control unit 4 is at a measurement position which is a position perpendicular to the near rod 2.

Returning to FIG. 2, the person to be measured sits opposite the optometry table 15 so as to face the measurer sitting on the near side of the optometry table 15. When performing near vision measurement after performing distance vision measurement by the measurement head unit 8, the near vision bar 2 is rotated about 90 degrees toward the front side on the optometry table 15 to the use position (the position shown in FIG. 3). Hold. This usage position is
This is a position on the median plane of the subject when the eyes of the subject are located at predetermined positions of the measurement windows 9c and 9d of the two left and right lens units 9a and 9b of the measurement lens unit 9. . Then, the target control unit 4 is moved from the storage position to the measurement position (the position shown in FIG. 3). Then, a control signal is given to the optotype control section 4, and the optotype control section 4 selects and displays the instructed optotype.

The measuring arm 5 has a step 5a near the center in the longitudinal direction as shown in FIG. By the step 5a, when the optotype presenting device 1 is in the storage position and the near rod 2 is in the retracted position, the optotype presenting device 1 is compactly attached to the measuring arm portion 5 without hitting the measuring arm portion 5. Is stored.

FIG. 5 is a side view showing the structure of the rotating part 3a of the optotype driving unit 3 in which a part of FIG. 1 is enlarged. FIG.
5 shows a structure of a rotating unit 3a and the like of the optotype driving unit 3, and FIG.
It is A sectional drawing. A flange-shaped steel ball receiver 3c is fixed to the support plate 3b, which is a part of the housing of the optotype drive unit 3, around the rotation shaft 4b. Steel ball receiver 3
In FIG. 5C, four holes are provided at 90 ° intervals at the up, down, left, and right positions in FIG. The rotating shaft 4b is fixed to the housing 4a of the optotype control unit 4, and a click plate 4g holding four steel balls 4c, 4d, 4e, 4f at one end of the rotating shaft 4b.
Is fixed. Click ball 4g with steel ball 4
Four holes for engaging c, 4d, 4e, and 4f are provided every 90 degrees. A click holding plate 4h having a spring property is further fixed to one end of the rotating shaft 4b. A spring force acts on the click holding plate 4h so as to press the steel balls 4c, 4d, 4e, 4f against the steel ball receiver 3c.

With the above configuration, the optotype control section 4 rotates around the rotation shaft 4b with respect to the optotype driving section 3, and the storage position where the optotype control section 4 is horizontal and the optotype control section 4 The rotation position can be held at two positions, that is, the vertical measurement position and the measurement position.

As shown in FIG. 5, the optotype driving section 3 is provided with a microswitch 3d, and when the optotype control section 4 is at the storage position, the housing section 4a is connected to the microswitch 3d.
It is configured to be turned on by touching. The microswitch 3d is connected to a control device, and the control device supplies a drive current to a motor driving device built in the optotype driving unit 3 (see FIG. 9). The control device automatically moves the optotype driving unit 3 along the near rod 2 based on the ON signal of the micro switch 3d and moves the optotype driving unit 3 to a predetermined position (for example, the position of the distance indication 34 cm on the side surface of the near rod 2) To stop. The predetermined position is such that the optotype presenting device 1 that has moved to the retreat position later fits compactly in the retreat space formed by the step 5a (see FIG. 2) of the measurement arm 5 without hitting the measurement arm 5. Is a position on the near rod 2 set to "1".

Next, with reference to FIG. 6, the structure of the motor driving device built in the optotype driving unit 3 will be described. Near rod 2
Is a hollow rod-like body having an opening at the center of the lower surface and having a U-shaped cross section. A rack 21 is provided on the back surface of the upper wall on one surface in the longitudinal direction of the near rod 2. On one side surface 2a inside the near rod 2, a positive / negative electrode plate connected to a power terminal on the side of the measuring arm 5 is attached to one surface in the longitudinal direction of the near rod 2, and A reflection plate for position detection is adhered to a part of the side surface 2b facing the electrode plate inside.

The target driving unit 3 has a built-in pulse motor 31 as driving means. Further, rollers 32a to 3a which abut against the near bar 2 from above and below and from left to right to pinch it.
Mounting member 32 to which 2e is attached;
And a pinion 33 that rotates while meshing with the pinion. The pulse motor 31 includes a worm 34, a worm wheel 35,
By driving the pinion 33 via the timing belt 36 and the pulleys 37a and 37b, the optotype driving unit 3 can travel along the near rod 2. Further, the optotype driving unit 3 is provided with an optical sensor 38 a on the sensor substrate 38. Accordingly, when the optotype driving section 3 moves, the presentation position of the optotype is detected based on the number of pulses commanded to the pulse motor 31 and the reference position signal output from the optical sensor 38a provided on the sensor substrate 38. You.

FIG. 7 is a side sectional view showing a detailed structure of the mounting unit 6 and the distal end of the measuring arm 5. The figure shows a case where the mounting unit 6 is at the retracted position. The mounting unit 6 is a PD unit 10
Is attached to the measurement arm unit 5 so as to be rotatable about a head rotation shaft 10a fixed to the measurement arm unit 5. A housing bearing 5a penetrated by a head rotating shaft 10a is provided at the tip of the measurement arm 5, and the housing bearing 5a is usually fixed to the head rotating shaft 10a by a head fixing knob 5b. The housing bearing 5a is provided with a coil-shaped near bar feed spring 5c, and one end of the near bar feed spring 5c is engaged with a spring base 6a fixed to the mounting unit 6, and the mounting unit The part 6 is constantly biased in the direction of the use position of the near rod 2. Further, the housing bearing 5a is provided with two micro switches 5d and 5e arranged in the axial direction of the head rotating shaft 10a, and is provided with a protruding pin 5f and an electromagnetic solenoid 5h which move up and down in FIG. An L-shaped connecting plate 5g is connected between the protruding pin 5f and the electromagnetic solenoid 5h, and the protruding pin 5f moves downward in FIG. 7 only when the electromagnetic solenoid 5h is biased by the connecting plate 5g. . Micro switch 5
d, 5e and the electromagnetic solenoid 5h are connected to the control device.

FIG. 8 is a plan sectional view of the tip of the mounting unit 6 and the measuring arm 5, and FIG. 8A shows the mounting unit 6 in the use position.
(B) shows a case where the mounting unit 6 is at the retracted position. The following description is made with reference to FIGS. 7 and 8. A ball holder 6aa for holding two steel balls 6b, 6c is provided on a part of the spring base 6a, and a click spring 6d is fixed to the ball holder 6aa. On the other hand, a click base 6e having four recesses on the outer peripheral surface for receiving the steel balls 6b and 6c is fixed to the head rotating shaft 10a, and the steel balls 6b and 6c are fixed to the click base 6 by a click spring 6d.
e is constantly pressed. The positions of the four recesses are the mounting unit section 6 and the near rod 2 set therein.
, And are provided at every 90 degrees. Therefore, the ball holder 6aa and the spring base 6a can rotate with respect to the click base 6e and the head rotating shaft 10a via the steel balls 6b and 6c, and the steel balls 6b and 6c can be rotated by two click bases 6e.
When it reaches one dent, it stops clicking at that rotational position.
That is, the spring base 6a is fixed to the mounting unit 6, and the head rotating shaft 10a is
8A, the mounting unit 6 moves in the horizontal plane (the direction of the arrow 81 in FIG. 8) with respect to the measuring arm 5, and the use position [FIG. 8A] and the retreat position [FIG. ]
And the rotational position is maintained.

Further, on the circular outer peripheral surface of the spring base 6a, 9
Two projections 6f and 6g are provided 0 degrees apart. These projections 6f and 6g are provided on another circumference slightly apart from each other, not on the same circumference. When the mounting unit 6 is in the use position (FIG. 8A), the protrusion 6g touches the microswitch 5e to turn on, while when the mounting unit 6 is in the retracted position [FIG. )]
The projection 6f touches the microswitch 5d and turns on.

Further, a protruding pin receiver 6h is provided on a part of the mounting unit 6. This protruding pin receiver 6h
Is engaged with the protruding pin 5f when the mounting unit 6 is at the retracted position and the protruding pin 5f is positioned in the upward direction in FIG. 7 (when the electromagnetic solenoid 5h is deenergized). The holding unit 6 is held at the retracted position.

FIG. 9 is a block diagram schematically showing a control device. The control device 91 includes an input / output device, a CPU, an RA,
An input device 92 composed of an M, a ROM, a drive circuit and the like, and composed of a keyboard, and a display device 93 which is an output device such as a CRT display are connected. On the input side of the control device 91, various input signals such as ON signals from the micro switches 3d, 5d, 5e are connected. On the output side, the optotype driving section 3 and the optotype control section 4 are connected. , A head support 14, an electromagnetic solenoid 5h, and the like.

Next, the operation of the mounting unit 6 and the distal end of the measuring arm 5 will be described. The following operation is executed by the control device 91. When the measurer inputs an instruction to perform near vision measurement to the control device 91 via the input device 92, the electromagnetic solenoid 5h is energized, and the protruding pin 5f moves downward in FIG. 6h is released. Then, the attachment unit 6 is slightly rotated from the retracted position in the direction of the use position by the urging force of the near bar feed spring 5c. Thereafter, when the mounting unit 6 is rotated to the use position by the manual operation of the measurer, the click is stopped and the microswitch 5e is turned on. Until the micro switch 5e is turned on, the display device 93 displays a screen saying "Please set the near bar to the use position".

Next, when the measurer inputs to the control device 91 via the input device 92 to end or stop the near measurement, the display device 93 is turned on while the microswitch 5e is on. Is displayed on the screen, "Set the near rod in the storage position", and the rotation of the measurement arm unit 5 to the storage position in the horizontal plane by the head support unit 14 is prevented. When the mounting unit 6 is rotated in the retreating position direction by the manual operation of the measurer and the mounting unit 6 is set to the retreating position against the urging force of the near bar feed spring 5c, the click is stopped,
The protruding pin 5f moves upward in FIG.
h and the microswitch 5d is turned on. Until the micro switch 5d is turned on, a screen display "Please set the near bar to the retracted position" is displayed on the display device 93.

[0030]

As described above, in the present invention, as described above, at the time of near vision measurement, the support rod is held at the first position, and the optotype presenting unit incorporating the short-distance target held by the support rod is provided. While the plane of the short-distance target is located in the vertical direction, at the time of distance measurement, the support rod is horizontally rotated and stored in the second position, and the target presenting unit is configured to store the plane of the short-distance target. Are positioned so as to be substantially horizontal to the support bar. Therefore, the support rod and the optotype presenting part are stored compactly with a simple structure,
No safety issues.

That is, since the rotational movement is manually performed with respect to the optotype presenting unit and the support rod, the structure is simplified. In addition, since the support rod moves in the horizontal plane and is stored at the second position, there is no rotating part to which a load is applied unlike the conventional case.
High safety.

[Brief description of the drawings]

FIG. 1 is a side view showing an optotype presenting device and a near rod according to the present invention.

FIG. 2 is a front view showing the overall configuration of a subjective optometry system including a target presentation device.

FIG. 3 is a side view of a subjective optometry system including a target presenting apparatus.

FIG. 4 is a plan view of a subjective optometry system including a target presenting apparatus.

FIG. 5 is a side view showing a structure of a rotating unit of the optotype driving unit, in which a part of FIG. 1 is enlarged.

6 shows a structure of a rotating unit and the like of an optotype driving unit, and FIG.
It is -A sectional drawing.

FIG. 7 is a side sectional view showing a detailed structure of a mounting unit and a distal end of a measurement arm.

8A and 8B are plan cross-sectional views of the mounting unit and the distal end of the measurement arm, wherein FIG. 8A shows a state in which the mounting unit is in a use position, and FIG. 8B shows a state in which the mounting unit is in a retracted position. Is shown.

FIG. 9 is a block diagram schematically showing a control device.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 optotype presenting device 2 near rod 3 optotype drive section 4 optotype control section 5 measuring arm section 6 mounting unit section 7 screw

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 2-55915 (JP, U) JP-A 3-16903 (JP, U) JP-A 52-150296 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) A61B 3/032

Claims (4)

(57) [Scope of request for utility model registration] 1. A receiving mechanism of the optotype presenting apparatus of optometric apparatus for performing measurement using a short-range optotype, holds the measurement head at one end, measuring connects to the column at the other end
A constant arm, attached to said one end of the measuring arm, the measuring
A first position on the median plane of the subject when facing the front of the measurement head section around the one end side of the fixed arm section , and a second position substantially parallel to and close to the measurement arm section A support rod that horizontally rotates between the support rod and one end of the support rod that is held by the support rod and that has a built-in short-distance target in a vertical direction when the support rod is at the first position. receiving mechanism optotype presenting apparatus optometric apparatus characterized by having a target display portion which is located approximately horizontally when in the second position. 2. The apparatus according to claim 1, further comprising a control device, wherein the target is presented.
The unit includes a switch that is turned on when a plane of the short-range target is located in a substantially horizontal direction, and a motor driving device that moves the target presenting unit along the support rod, and the control device includes: 2. The storage of the optotype presenting device of the optometric apparatus according to claim 1, wherein the input of a switch ON signal drives the motor drive device to move the optotype presenting section to a predetermined position of the support rod. Mechanism . 3. A control device having a display device, wherein the support bar detects a position of the support bar at the first position and the second position, respectively.
2. The control device according to claim 1, further comprising: a detecting unit configured to detect the output of the first detecting unit and the second detecting unit. A storage mechanism of the optotype presenting device of the optometric apparatus according to the above. 4. The support has rotation drive means for rotating the measurement arm section around the support, and the control device controls the support rod in accordance with an output of the first detection means. 4. The storage mechanism for the optotype presenting device of the optometric apparatus according to claim 3, wherein the drive of the rotation drive unit is prohibited when the rotary unit is located at the first position.