JPH10276981A - Method and device of optometry target projection and target board for optometry target projection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to precisely present more various targets, by providing plural rows of target patterns on a target board to enable to select and project an arbitrary pattern row and an arbitrary target pattern. SOLUTION: First and second pattern rows 5a, 5b for projection comprising a number of target patterns with translucent patterns for unit projection on the circumference at distances of radii r1 , r2 from the center are formed on a target board 5. Accordingly, when a mirror unit 6 is selected so that a projection image of a target pattern for projection on the target board 5 is guided into an objective lens 7 and the target board 5 is controlled to rotate, a desired target pattern for projection can be projected on a screen. That is, an aimed target pattern can be freely selected from all the target patterns on the target board 5 and can be projected on a screen 8 by combining selecting operation of a setting position of the mirror unit 6 and rotation control of the target board 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for projecting an optotype for projecting an optotype used for optometry, and a target plate for projecting an optotype.

[0002]

2. Description of the Related Art An eye chart is used when performing an eye examination such as an eye test. This eye chart has various optotypes necessary for optometry, and is presented at a position separated from the subject by an appropriate distance. As this eye chart, the required optotypes are arranged on a roll-shaped paper surface, the eye is examined while illuminating the paper surface, or the optotypes are arranged on a translucent member and illuminated from the back. In addition to the above, a projection type visual acuity chart (chart projector) is known.

[0003] Projection visual acuity chart (chart projector)
Is a visual acuity table of a method of forming an optotype projection image of a target plate for optometry optotype projection on which a required optotype pattern for projection is formed on a screen. Optotype charts of this type have been used recently because of their advantages of being relatively small and compact and easy to handle.

[0004]

Incidentally, it has been said that the projection type visual acuity table has a drawback in brightness and precision as compared with other types because it is a projection type. Also,
Although this method is easy to increase the number of optotypes as compared with other methods, recently, there is an increasing demand for increasing the number of optotypes.

The present invention has been made in view of the above-mentioned background, and has an optometric optotype projecting method and apparatus and an optometric optotype projecting apparatus capable of presenting more types of optotypes more precisely. It is intended to provide a target plate for use.

[0006]

In order to solve the above-mentioned problems, the present invention is directed to an optometric examination projecting method in which an optotype projecting pattern comprising a light-transmitting pattern is formed on a light-shielding plate. An optometric optotype projecting method using a target plate and projecting projection light through the projecting optotype pattern of the target plate to form a projection image of the optotype pattern on a projection screen, wherein the optometric optotype On the target plate for projection,
A plurality of projection optotype pattern arrays are arranged such that the projection optotype pattern is located on a specific straight line or curve on the target plate. The relative position between the projection light and the target plate can be changed so that the projection position can be arbitrarily selected on the specific straight line or curve, and any target from the target target pattern sequence can be selected. In the optometry optotype projection method that allows a pattern to be selected and projected, a plurality of the projection optotype pattern rows are provided on the optometry optotype projection target plate, and an arbitrary pattern row is selected from the pattern rows. An optometry optotype projection method, characterized in that an arbitrary optotype pattern is selected and projected.

According to a second aspect of the present invention, there is provided a projection optotype pattern array in which a plurality of projection optotype patterns each composed of a translucent pattern are arranged in the same circumference at a specific radial position from the center of the light-shielding disc. Using a target plate for optometry optotype projection with
The projection light is projected onto the circumference of the target plate on which the projection target pattern row is formed, and the disc is rotated around the center of the disc. Thus, in the optometric optotype projecting method in which an arbitrary optotype pattern can be selected and projected from the projecting optotype pattern sequence on a projection screen, the optometric optotype target target plate is A plurality of projection target pattern rows are respectively provided on a plurality of circles having different radial positions from the center, and an arbitrary pattern row is selected from the plurality of projection target pattern rows to select an arbitrary visual target among them. An optometric optotype projection method characterized in that a target pattern can be selected and projected.

According to a third aspect of the present invention, the selection of the target pattern to be projected on the screen is performed by selecting any one of the projection target pattern arrays on the optical path of the projection light from the light source of the projection light to the screen. And a projecting target pattern selecting operation for selecting and positioning any one of the projecting target patterns in the projecting target pattern sequence on the optical path of the projection light. The optometry optotype projection method according to claim 1, wherein the method is performed by a method.

According to a fourth aspect of the present invention, in the projection target pattern row selecting operation, the projection light is positioned on any two or more straight lines or curves on which the plurality of projection target pattern rows are located. It is an operation of projecting and forming two or more light beams having different optical paths from each other and passing through each projection target pattern, and selecting any one of these light beams and introducing the selected light beam into the projection objective optical system. A method for projecting an optometric optotype according to claim 3.

In a fifth aspect of the present invention, in the projecting target pattern array selecting operation, the relative position between the optometric target projecting target plate and the projection light is moved so that the light source of the projection light is transmitted to the screen. The optometry optotype projection method according to claim 3, wherein the operation is an operation of selecting and positioning any one of the projection target pattern arrays on the optical path of the projection light up to the point.

According to a sixth aspect of the present invention, there is provided a projection light source for emitting projection light, a target plate for optometric optotype projection in which a projection target pattern comprising a light-transmitting pattern is formed on a light-shielding plate-like body, Optometrist having an optical path means for projecting projection light onto a projection target pattern on the target plate, and an objective optical system for forming a projection image formed by passing the projection target pattern on the screen. An optotype projection device,
The target plate for optometry optotype projection is formed by forming a plurality of projection optotype pattern rows in which the projection optotype patterns are arranged on a specific straight line or curve on the target plate. A pattern sequence selecting means for selecting and positioning any of the projection target pattern arrays on the optical path of the projection light from the light source of the projection light to the screen; and any of the projection target pattern arrays And a projection target pattern selecting means for selecting and positioning the projection target pattern on the optical path of the projection light.

According to a seventh aspect of the present invention, there are provided a projection light source for emitting projection light, and a plurality of projection target patterns each composed of a light-transmitting pattern having the same circumference at a specific radial position from the center of the light-shielding disc. A target plate for optometric optotype projection having an array of projecting optotype patterns arranged in an array, and an optical path means for projecting the projection light onto a circumference of the target plate on which the projecting optotype pattern array is formed. Rotating drive means for rotating the target plate around its center to select the projection target pattern on which the projection light is projected, and the projection light passing through the projection target pattern on the target plate. And an objective optical system for forming a projection image formed on the screen, wherein the target plate for projecting the optometric target has a plurality of radial positions different from the center of the target plate. Circle of Different projection target pattern arrays are provided on the top, and any one of the projection target pattern arrays is selected and positioned on the optical path of the projection light from the light source of the projection light to the screen. An optometric optotype projection device comprising a pattern sequence selecting means for causing the optometry target.

In a preferred embodiment of the present invention, the pattern sequence selecting means projects the projection light so as to be located on any two or more straight lines or curves on which the plurality of projection target pattern sequences are located. Projection light beam forming means for forming two or more light beams having different optical paths that have passed through the respective projection target patterns, and a projection for selecting one of these light beams and introducing the selected light beam to the projection objective optical system. The optometry optotype projection apparatus according to claim 6, further comprising a light beam selection unit.

According to a ninth aspect of the present invention, the projection target pattern sequence selecting means moves a relative position between the optometry target target projection plate and the projection light to reach a screen from a light source of the projection light. 8. The optometry optotype projection according to claim 6, further comprising a pattern row moving unit that selects and positions any of the projection optotype pattern rows on the optical path of the projection light up to the target. Device.

According to a tenth aspect of the present invention, the projection light beam selecting means reflects the light beam from a direction different from the optical path direction of the objective optical system and introduces the light beam into the objective optical system;
The second reflecting means for reflecting the light beam that has passed through the projection target pattern and sending it to the first reflecting means, and the optical axes of the objective optical system and the first reflecting means are matched. A rotation mechanism for rotating the first reflection means and the second reflection means integrally with the optical axis as a rotation axis, and integrating the first reflection means and the second reflection means; By rotating the light beam, any one of two or more light beams having different optical paths passing through the projection target pattern can be selected and introduced into the objective optical system. An optometric optotype projection apparatus according to claim 8, wherein:

An eleventh aspect of the present invention is a target plate for optometric optotype projection in which a projection target pattern comprising a light-transmitting pattern is formed on a light-shielding plate-like body, wherein the light-shielding plate-like body is a glass substrate. Wherein the projection target pattern is formed by selectively removing a part of the chromium film to form a pattern. It is.

A twelfth aspect of the present invention is a projection optotype pattern array in which a plurality of projection optotype patterns each composed of a translucent pattern are arranged in the same circumference at a specific radial position from the center of the light-shielding disc. A target plate for projecting an optotype having an eye, wherein the projecting optotype pattern sequence is provided on a plurality of circumferences having different radial positions from the center of the target plate. It is a target plate for target projection.

[0018]

FIG. 1 is a diagram showing a schematic configuration of an optometric optotype projecting apparatus according to an embodiment of the present invention, FIG. 2 is an external perspective view of the optometric optotype projecting apparatus according to the embodiment, and FIG. 4 to 6 are exploded views of the optometric optotype projection apparatus according to the embodiment, and FIGS. 7 and 8 are partial views of the optometric optotype projection apparatus according to the embodiment. 9 and 10 are partial explanatory views of the optometric optotype projection apparatus according to the embodiment. FIGS. 11 to 13 show target plates used as optometric optotype projection target plates in the optometric optotype projection apparatus according to the embodiment. FIG. 14 is an explanatory view of a mask plate used in the optometry optotype projection apparatus according to the embodiment. Less than,
An optometric optotype projection apparatus according to an embodiment will be described with reference to these drawings.

As shown in FIG. 1, in the optometry optotype projection apparatus of this embodiment, light emitted from a projection light source 1 is reflected by two mirrors 2a and 2b, and two projections are made by condenser lenses 3a and 3b. The light beam is projected onto two different positions in the radial direction of the mask plate 4 and the target plate 5, and the light beam is projected onto each of the two positions.
A group of optotype projected images can be formed, and one of the two groups of optotype projected image groups can be selected by the mirror unit 6 and introduced into the objective lens 7 to form an image on the screen 8. Things. Then, an operation of selecting a specific target projection image from the selected projection image group is performed by controlling the rotation of the mask plate 4 and the target plate 5, respectively.

As shown in FIG. 4, the light source 1 is constituted by a halogen lamp or the like, and is disposed at the center of the lamp house 12. The mirrors 2 a and 2 b are arranged orthogonally to each other in the lamp house 12 so as to surround the light source 1.
Therefore, the light emitted from the light source 1 is reflected by the mirrors 2a and 2b.
To the divergent light beam regulated by these mirror reflection areas, travels to the left in the figure, and travels to the condenser lens 3
a, 3b.

The condenser lenses 3a and 3b are both in the divergent light beam bundle and convert the divergent light beam beam into separate projection light beam beams to form two projection lights. As shown in FIG. 5, the condenser lens 3
Reference numerals a and 3b each include a plurality of lens groups, and are accommodated in lens cases 30a and 30b formed on a base case 45a of a target case 45 accommodating the mask plate 4 and the target plate 5, respectively. The lens cases 30a and 30b are connected to the target case 45 described above.
The projection light emitted from the condenser lenses 3a and 3b is formed at different positions in the radial direction with respect to the mask plate 4 and the target plate 5 housed in the projector.

The mask plate 4 and the target plate 5 are housed in a target case 45 and are coaxially arranged, but are disk members supported so as to be able to control rotation independently of each other. A large number of unit light-transmitting patterns are formed on the same circumference.

The mask plate 4 is a mask that blocks a part of each target target projection pattern formed on the target plate 5 so that only a necessary part can be projected. Figure 14 is a plan view of a mask plate 4, a first mask pattern array 4a comprising a number of unit mask pattern having a light-transmitting pattern on a circumference of a position of a radius r ₁ from the center are formed, the radius from the center Similarly on the circumference of the position of r ₂ in which the second mask pattern array 4b is formed. This mask plate 4
Has a light transmitting through pattern formed on a 150 mm diameter, 0.25 mm thick aluminum plate by photoetching. Note that the first mask pattern row 4a and the second mask pattern row 4b are provided with a pattern having no light-transmitting pattern, that is, an area which can be called an all-light-shielding pattern. This is because the projection image may fluctuate due to the inertia of the target plate 5 itself when the projection target is switched, and may cause discomfort to the subject. Therefore, the mask plate is rotated while the target plate 5 is rotating. This is because the light is shielded by 4 so that no shaking can be seen.

The target plate 5 receives the projection light from the condenser lenses 3a and 3b and forms a projection image of the optometric optotype.

FIG. 11 is a plan view of the target plate 5.
Central first projection optotype pattern array 5a comprising a plurality of unit projection optotype pattern having a light-transmitting pattern on the circumference of the position of the radius r ₁ is formed from a circular position of the radius r ₂ from the center Similarly, a second projection target pattern row 5b is formed on the circumference. This target plate 5 has a radius of 148 m
m, about 0.15 μm on the surface of a 1.5 mm thick glass plate
A thick light-shielding chromium film was formed, and a part of the chromium film was removed in a pattern by a photoetching method or the like to form a light-transmitting pattern (a pattern including a light-transmitting portion and a light-shielding portion). Things. 12 and 13 are diagrams showing examples of the target projection target pattern. The target shown in FIG. 12 is for a red-green test, and the target shown in FIG. 13 is a Landolt's ring.

As shown in FIGS. 5 and 8, shaft members 401 and 501 are fixed to the mask plate 4 and the target plate 5, respectively, and a central shaft hole formed along the axis of these shaft members is provided in the center shaft hole. The rotating shafts 411 and 511 of the stepping motors 41 and 51 are inserted and fixed, respectively.
The rotation of the mask plate 4 and the target plate 5 is controlled by stepping motors 41 and 51 based on a command from the control board 9 (see FIG. 1). Reference position detection plates 402 and 502 are attached to the shaft members 401 and 501 of the mask plate 4 and the target plate 5, respectively, and the positions of the reference position detection plates 402 and 502 are detected in the target case 45. Then, detectors 403 and 503 for transmitting the detection signal to the control board 9 are provided.

An optotype projection image (projected light beam) formed by the target plate 5 is guided to an objective lens 7 by a mirror unit 6. The mirror unit 6 has two mirrors 6a and 6a so that the reflection surfaces are opposed to each other and parallel to each other.
b is fixed to the mirror unit main body 60. As shown in FIG. 6, one end (upper end) of the mirror unit main body 60 is fixed to a rotary cylinder 601 that shares the optical axis of the objective lens 7 and its rotation axis.
Is a bearing 603 attached to a bearing member 602 attached to the fixed portion.
And 604 are rotatably supported. The rotating cylinder 601 has a tooth 622 formed at an end thereof.
The other tooth portion 62a of the belt 62 is engaged with the tooth of the toothed pulley 621, and the pulley 621 is fitted on the rotating shaft 611 of the stepping motor 61. It is fixed. In addition,
A rotation reference position detection plate 623 is fixed to the pulley 621, and a rotation reference position detector 623 fixed to a fixing portion.
The rotation reference position is detected by the cooperative operation with (see FIG. 7), and the signal is sent to the control board 9. As a result, the mirror unit 6 whose upper end is fixed to the rotary cylinder 601 performs a predetermined rotation control around a rotation axis common to the optical axis of the objective lens based on a command signal from the control board 9. I have.

As shown in FIG. 5, the opening at the lower end of the mirror unit main body 6 passes through the window 451b of the lid case 45b of the target case 45 and the cutout 451a formed in the base case 45a. It is arranged at a position facing the first projection target pattern row 5a or the second projection target pattern row 5b. That is, the rotation of the stepping motor 61 is controlled by a command signal from the control board 9, and the belt 6 is controlled.
By rotating the rotary cylinder 601 through the second unit 2 to rotate the mirror unit main body 60, the mirror unit main body 60 is rotated.
It is possible to select whether the opening at the lower end portion of the target plate 5 is arranged at a position facing either the first projection target pattern row 5a or the second projection target pattern row 5b of the target plate 5. ing.

FIG. 9 is an explanatory diagram of this selecting operation. By rotating the mirror unit main body 60, the optical axis of the mirror unit 6 is switched between the position indicated by A and the position indicated by B. You can do it. When the optical axis of the mirror unit 6 is at the position indicated by A, the mirror unit 6
The projection image of the projection target pattern in the projection target pattern array 5a is introduced into the objective lens 7, and when the optical axis of the mirror unit 6 is at the position indicated by B, the second projection target pattern is displayed. The projection image of the projection target pattern in the target pattern row 5 b is introduced into the objective lens 7. In either case, the optical path of the projected image of the projection target pattern is as shown in FIG.

Here, as one of the binocular visual inspections, there is an inspection using a polarization chart in the second index pattern sequence.
This polarized visual target has a linear target in a part of a target pattern and a polarizer having a polarization axis orthogonal to the polarization axis of the linear polarizer in another part. The projected image of the target is an image of polarized light formed through the target plate. The optometry is performed by arranging polarizing plates whose polarization axes are orthogonal to each other in front of the left and right eyes of the subject's eye, and viewing a projected image through these polarizing plates. If the polarization state changes in the middle of the optical path between the target plate 5 and the screen 8, this inspection will be hindered.
In this embodiment, when the optical axis of the mirror unit 6 is at the position indicated by B, the direction of the optical axis is set to an angle that does not change the polarization state of the polarization target.

As shown in FIG. 6, the objective lens 7 is composed of a plurality of lens groups and is stored and fixed in the objective lens storage tube 71 by an intermediate ring 702 and a fixed ring 701. 72. The objective lens 7 forms the projection target pattern image introduced by the mirror unit on the screen 8.

The mechanical parts such as the target case 45, the mirror unit 6, and the objective lens 7 are fixed to a fixed member.
It is fixed to 0. Also, the above-mentioned mechanism is a front cover 1
11, are covered by side covers 112 and 113.

In the above configuration, the mirror unit 6 is selected so that the projection image of the projection target pattern in the first projection target pattern row 5a of the target plate 5 is introduced into the objective lens 7. When the rotation of the target plate 5 is controlled, a desired projection target pattern in the first projection target pattern sequence 5a can be projected on the screen.
On the other hand, the mirror unit 6 is selected so that the projection image of the projection target pattern in the second projection target pattern row 5b of the target plate 5 is introduced into the objective lens 7, and the target plate 5 is rotated. When controlled, a desired projection target pattern in the second projection target pattern sequence 5b can be projected on the screen. Therefore, by combining the operation of selecting the set position of the mirror unit 6 and the rotation control of the target plate 5, the target optotype pattern can be freely selected from all the target optotype patterns for projection on the target plate 5, and the screen is selected. Can be projected.
In addition, by controlling the rotation of the mask plate 4 in addition to this operation, it is also possible to select and project only a part of one projection target pattern.

According to the above-described embodiment, there are the following advantages.

The target plate 5 is provided with two rows of projection target pattern rows 5a and 5b. An arbitrary pattern row is selected from these pattern rows, and an optional target pattern is selected from among them. With this configuration, it is possible to provide various types of targets with one target plate.
As a result, it has become possible to perform measurement without replacing the target plate which had to be replaced depending on the measurement in the past.

In the embodiment, the optical path is switched by rotating one end of a mirror unit having two mirrors around the optical axis of the objective lens so that the optical path length is not changed by the switching. Therefore, there is no need to provide an optical path length correcting means as compared with other methods in which the optical path length changes by switching.

Further, by forming the target plate 5 by forming a chromium light-shielding film on a glass plate and forming a light-transmitting pattern thereon by photoetching or the like,
It is possible to obtain an extremely high-precision pattern, and the pattern variation due to thermal expansion is extremely small, and furthermore, it is extremely excellent in physical, mechanical and chemical durability,
It has excellent advantages such as no aging and stable use for a long time.

In the above-described embodiment, as the pattern row selection operation or means of the present invention, the projection light is set so as to be positioned on any two or more straight lines or curves where a plurality of projection target pattern rows are located. Projection light beam forming means for projecting and forming two or more light beams having different optical paths from each other and passing through each projection target pattern, and selecting one of these light beams and introducing the selected light beam into the projection objective optical system. This is an example of an apparatus having a projection light beam selecting means for selecting a light beam by rotating the mirror unit 6. However, as shown in FIG.
May be translated. However, in this case, since the optical path length is changed by the switching, it is necessary to use the optical path length correcting lens 351 for the correction. In addition, as shown in FIG.
Alternatively, one of the mirrors 653 and 653 may be movable, and the mirror 653 may be switched by removing the mirror 653 from the optical path. That is, when the mirror 653 is arranged in the optical path, the projected image reaching the rear surface is blocked by the mirror 653, while the projected image reflected by the mirror 652 is reflected by the mirror 653 and guided to the objective lens. On the other hand, when the mirror 653 is removed from the optical path, only the projected image that passes through the target plate 5 and travels straight is guided to the objective lens, and switching is performed. Further, as shown in FIG. 17, two projection light beams which travel on a symmetrical straight line with the optical axis of the objective lens 7 as a symmetric axis are formed, and the two light beams of the objective lens 7 are respectively reflected by two mirrors 654 and 655. After making the light beam advancing on one straight line perpendicular to the axis, the light beam is guided to a rotating mirror 656 with the axis orthogonal to the optical axis of the objective lens 7 as the rotation axis, and this mirror 656 is rotated. May be selected and guided to the objective lens 7.

Further, as shown in FIG. 18, as a projection target pattern sequence selecting means, the relative position between the optometry target projection target plate and the projection light is moved so as to reach from the light source of the projection light to the screen. Any of the projection target pattern arrays may be selected and positioned on the optical path of the projection light.

Further, the target plate for projecting the optometry optotype does not necessarily have to be a disk, but a plurality of optotype patterns for projection are formed on a rectangular plate along a straight line along the longitudinal direction. A plurality of pattern rows may be formed in parallel.

[0041]

As described above in detail, according to the present invention, a plurality of projection target pattern rows are provided on a target plate for optometric projection target projection, and an arbitrary pattern row is selected from the pattern rows. Any of the optotype patterns can be selected and projected, which enables projection of more types of optotypes, and a chromium film is formed on a glass substrate as a target plate for optometry optotype projection The chromium film is formed with a light-transmitting pattern so that the pattern accuracy is high and the temperature dependence is low, so that a highly accurate projection image can be obtained and the optometry target plate has excellent durability. It is possible to obtain.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an optometry optotype projection apparatus according to an embodiment of the present invention.

FIG. 2 is an external perspective view of the optometric optotype projection apparatus according to the embodiment.

FIG. 3 is a partial cross-sectional view of the optometry optotype projection apparatus according to the embodiment.

FIG. 4 is an exploded view of the optometry optotype projection apparatus according to the embodiment.

FIG. 5 is an exploded view of the optometry optotype projection apparatus according to the embodiment.

FIG. 6 is an exploded view of the optometry optotype projection apparatus according to the embodiment.

FIG. 7 is a partial view of the optometry optotype projection apparatus according to the embodiment;

FIG. 8 is a partial view of the optometry optotype projection apparatus according to the embodiment.

FIG. 9 is a partial explanatory diagram of the optometric optotype projection apparatus according to the embodiment;

FIG. 10 is a partial explanatory diagram of the optometric optotype projection apparatus according to the embodiment;

FIG. 11 is an explanatory diagram of a target plate used as a target plate for optometry optotype projection in the optometry optotype projection apparatus according to the embodiment.

FIG. 12 is an explanatory diagram of a target plate used as a target plate for optometry optotype projection in the optometry optotype projection apparatus according to the embodiment.

FIG. 13 is an explanatory diagram of a target plate used as a target plate for optometry target projection in the optometry target projection apparatus according to the embodiment.

FIG. 14 is an explanatory diagram of a mask plate used in the optometry optotype projection apparatus according to the example.

FIG. 15 is an explanatory diagram of an embodiment of a modification of the embodiment of the present invention.

FIG. 16 is an explanatory diagram of an embodiment of a modification of the embodiment of the present invention.

FIG. 17 is an explanatory diagram of an embodiment of a modification of the embodiment of the present invention.

FIG. 18 is an explanatory diagram of an embodiment of a modification of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light source 2a, 2b ... Mirror 3a, 3b ... Condenser lens 4 ... Mask plate 5 ... Target plate 6 ... Mirror unit 7 ... Objective lens 8 ... Screen

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiro Yoda 2-7-5 Nakaochiai Shinjuku-ku, Tokyo Hoya Co., Ltd.

Claims (12)

[Claims] 1. An optometric test target projecting target plate in which a projecting target pattern composed of a light-transmitting pattern is formed on a light-shielding plate-like body, and projects projection light through the projecting target pattern of the target plate. An optometry optotype projection method for forming a projection image of an optotype pattern on a projection screen, wherein the optometry optotype projection target plate has a projection optotype pattern on the target plate, While forming a plurality of projection target pattern arrays arranged so as to be located on a straight line or a curve, arbitrarily select a projection position of projection light on the optometric target target projection plate on the specific straight line or the curve. In order to be able to change the relative position between the projection light and the target plate, an arbitrary optotype pattern is selected from the projection optotype pattern sequence and projected. In the optometry optotype projection method, a plurality of projection optotype pattern rows are provided on the optometry optotype projection target plate, an arbitrary pattern row is selected from the pattern rows, and an arbitrary one of them is selected. An optometric optotype projecting method, characterized in that an optotype pattern can be selected and projected. 2. An optometric optotype having a projection optotype pattern array in which a plurality of projection optotype patterns each composed of a translucent pattern are arranged in the same circumference at a specific radial position from the center of the light-shielding disc. Using a projection target plate, the projection light is projected onto the circumference of the target plate on which the projecting target pattern pattern row is formed, and the disc is positioned at the center of the disc. An optometric optotype projecting method wherein an arbitrary optotype pattern can be selected and projected from the projecting optotype pattern sequence on a projection screen by rotating about a rotation center. On the plate, different projection optotype pattern rows are provided on a plurality of circles having different radial positions from the center of the target plate, and an arbitrary pattern row is selected from the plurality of projection optotype pattern rows. Eye optotype projection method being characterized in that to allow selection to project any optotype patterns therein Te. 3. The selection of a target pattern to be projected on the screen is performed by selecting one of the target patterns on the optical path of the projection light from the light source of the projection light to the screen. A method including a selection operation and a projection target pattern selection operation for selecting and positioning any one of the projection target patterns in the projection target pattern sequence on the optical path of the projection light. The optometry optotype projection method according to claim 1 or 2, wherein: 4. The operation of selecting an optotype pattern sequence for projection,
Two or more light beams having different optical paths from each other, projecting the projection light so as to be positioned on any two or more straight lines or curves on which the plurality of projection target pattern arrays are located. 4. The optometry optotype projection method according to claim 3, wherein the operation is to form a bundle, select one of these light bundles, and introduce the selected bundle into the objective optical system for projection. 5. The projecting target mark pattern sequence selecting operation includes:
By moving the relative position between the optometry optotype projection target plate and the projection light, one of the projection optotype pattern rows is selected on the optical path of the projection light from the light source of the projection light to the screen. The optometry optotype projection method according to claim 3, wherein the operation is an operation of positioning the eye. 6. A projection light source for emitting projection light, a target plate for optometry optotype projection in which a projection optotype pattern formed of a light-transmitting pattern is formed on a light-shielding plate-shaped body, An optometric optotype projecting apparatus comprising: an optical path means for projecting onto a projecting optotype pattern of a plate; and an objective optical system for forming a projection image formed by passing the projecting optotype pattern through projection light onto a screen. The target plate for projecting an optometry optotype is formed by forming a plurality of optotype pattern arrays for projection in which a plurality of the optotype patterns for projection are arranged on a specific straight line or curve on the target plate. Pattern row selecting means for selecting and positioning any of the projection target pattern rows on the optical path of the projection light from the light source of the projection light to the screen; and In An optotype optotype projecting apparatus, comprising: an optotype pattern selecting means for selecting and positioning any one of the optotype patterns for projection on the optical path of the projection light. 7. A projection in which a plurality of projection light sources for emitting projection light and a plurality of projection target patterns each composed of a light-transmitting pattern arranged in the same circumference at a specific radial position from the center of the light-shielding disc are arranged. A target plate for optometry optotype projection having a target optotype pattern array, an optical path means for projecting the projection light on a circumference of the target plate on which the projection optotype pattern array is formed, and the target plate. A rotation driving means for rotating the center of rotation to select a projection target pattern onto which the projection light is projected, and a projection driving pattern formed on the target plate by passing the projection light through the target target pattern; An optometry optotype projection device having an objective optical system that forms a projection image on a screen, wherein the optometry optotype projection target plate is located on a plurality of circumferences having different radial positions from the center of the target plate. Each different A pattern sequence for selecting and positioning any one of the projecting target pattern arrays on the optical path of the projecting light from the light source of the projecting light to the screen. An optometric optotype projection device comprising a selection unit. 8. The pattern sequence selecting means projects the projection light so as to be positioned on any two or more straight lines or curves on which the plurality of projection target pattern sequences are positioned, and performs each projection visual process. Projection light beam forming means for forming two or more light beams having different optical paths passing through the target pattern, and projection light beam selecting means for selecting any one of these light beams and introducing the selected light beam into the objective optical system for projection. The optometry optotype projection apparatus according to claim 6, wherein the optometry target projection apparatus is provided. 9. The projecting target pattern sequence selecting means,
By moving the relative position between the optometry optotype projection target plate and the projection light, one of the projection optotype pattern rows is selected on the optical path of the projection light from the light source of the projection light to the screen. The optometry optotype projection device according to claim 6, further comprising a pattern line moving unit that moves the optometry target. 10. The projecting light beam selecting means includes: first reflecting means for reflecting a light beam from a direction different from the optical path direction of the objective optical system and introducing the reflected light beam into the objective optical system; The optical axis of the second reflecting means for reflecting the transmitted light beam and sending it out to the first reflecting means, and the optical axes of the objective optical system and the first reflecting means are made coincident with each other to make the optical axis a rotation axis. And a rotation mechanism for integrally rotating the first reflection means and the second reflection means, and by integrally rotating the first reflection means and the second reflection means,
9. An apparatus according to claim 8, wherein an arbitrary light beam among two or more light beams having different optical paths passing through said projection target pattern is selected and introduced into said objective optical system. An optometric optotype projection device according to item 1. 11. A target plate for optometric optotype projection in which a projection target pattern comprising a light-transmitting pattern is formed on a light-shielding plate-like body, wherein the light-shielding plate-like body forms a chromium film on a glass substrate. A target plate for optometric optotype projection, wherein the projection target pattern is formed by selectively removing a part of the chromium film to form a pattern. 12. An optometry optotype having a projection optotype pattern array in which a plurality of projection optotype patterns each composed of a translucent pattern are arranged in the same circumference at a specific radial position from the center of the light-shielding disc. A projection target plate, wherein the projection target pattern array is provided on a plurality of circumferences having different radial positions from the center of the target plate, respectively. .