JPH042325A - Self-awareness type inspection device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a subjective testing device that can be used even in narrow spaces where the straight-line distance necessary for visual acuity testing cannot be secured.

(Prior art) Conventionally, as a subjective testing device used in optical shops and ophthalmology clinics with limited floor space, a subjective eye refractive power testing device is supported on a table corresponding to the subject's eye, and includes a light source and a projection screen. A visual acuity chart displaying means of the formula and a first reflecting device for guiding the light beam from the visual acuity chart displaying means are disposed in the table, and the light beam guided by the first reflecting device is guided toward the subject's eyes. A multi-reflection type device is known in which a second reflection device is provided on the table to ensure the optical path length from the subject's eye to the visual acuity chart display means.

In this configuration, the light beam from the visual acuity chart display means guided by the first reflecting device is reflected toward the subject by the second reflecting device, and then passed to the subject via the subjective eye refractive power testing device. It will enter the eye.

By the way, the above-mentioned 1. The second reflection device is for showing the optotype in the visual acuity chart display means to the eye to be examined,
For example, when using a near visual acuity chart different from the above-mentioned visual acuity chart display means, the second reflection device is moved away from the vicinity of the eye refractive power testing device. At this time, naturally, the visual acuity chart display means is also not in use.

(Problem to be solved by the invention) However, in the conventional device, the retraction operation of the second reflection device and the operation of turning off the light source of the visual acuity chart display means are not linked and are performed separately. Even if the user evacuates the eye chart display means, the operator forgets to turn off the light source of the visual acuity chart display means, and as a result, there is a problem in that power is wasted.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a subjective testing device that eliminates wasteful power consumption in the visual acuity chart display means by improving the configuration of the device.

[Structure of the Invention (Means for Solving the Problem) The present invention performs a subjective visual function test using an eye chart display means including a light source and an optotype displayed by the eye chart display means. In a subjective inspection device comprising an inspection means and a reflective optical system that selectively deflects the luminous flux from the visual acuity chart display means to an inspection position or a non-examination position of the inspection means, the means for inspecting the luminous flux by the reflective optical system. The present invention is characterized in that a light source driving means is provided for detecting a selective reflection state of the light source and turning on or off the light source.

(Function) According to the device having the above configuration, the operation of the light source driving means causes
The lighting or extinguishing of the light source of the visual acuity chart display means is linked to the state of reflection of the light beam by the reflective optical system to the inspection means.

(Example) Examples of the present invention will be described below with reference to FIGS. 1 to 3.

In the subjective testing device 1 shown in FIG. 1, 3 is a table used for visual acuity testing, which includes a table main body 3a and a box-shaped first leg 4 that supports one side of the table main body 3a.
and a hollow optical component storage box 5 that supports the other side of the table main body 3a.

The box 5 has a second leg portion 5a below the table main body 3a, and an upper hook portion 5 above the table main body 3a.
It is composed of b. A notch space 6 that is open to the examiner side is formed between the second leg portion 5a and the upper box 5b, and the upper surface 5c of the second leg portion 5a facing the notch space 6 is flush with the table body 3. They are formed to be on the same plane. Further, a hollow mirror mounting protrusion 7 that protrudes toward the table body 3 is formed at the upper end of the upper box portion 5b.

A projection screen 9 of the visual acuity chart display means 8 shown in FIG. 1 is provided on the upper surface 5C of the second leg 5a, and a projection optical system of the visual acuity chart display means 8 is disposed within the second leg 5a. ing.

This projection optical system includes a light source 10. condenser lens 11
．． Vision board 12. Variable magnification lens 139 Reflection mirror 14,1
5.16. Then, when the illumination light from [light source ]-0 is irradiated onto the visual acuity plate 12 through the condenser lens 11, the optotype 12a of the visual acuity plate 12 is projected onto the projection screen via the variable magnification lens 139 and the reflective mirror 14°15.16. 9 is projected and imaged as a visual target 12a'. In addition, visual acuity plate 1
2 may have a structure in which a large number of different visual acuity charts are attached in the circumferential direction on a transparent rotating disk, or may have a structure such as a slide projector.

Inside the upper box part 5b is a first lens constituting the reflective optical system 35.
Reflection mirror 18 of reflection device 17. 19° 20 are housed therein, and the reflection mirrors 2], 22 of the first reflection device 17 are housed in the mirror mounting protrusion 7. This reflective mirror 1
The mirrors 8 and 19 are arranged above the upper box part 5b in a slanted shape, and one of the reflecting mirrors 18 is arranged above the projection screen 9. Further, the reflecting mirror 20 is disposed directly below the reflecting mirror 19 at a height between the projection screen 9 and the path. In such a first reflecting device 17, the light beam from the projection screen 9 is reflected in the order of the reflecting mirrors 18, 19, 20, 21, and then reflected downward by the reflecting mirror 22. .

Directly below this reflecting mirror 22, a reflecting mirror 23, which is a second reflecting device as a part of a reflecting optical system 35 that reflects and guides the light beam from the reflecting mirror 22 toward the subject's side, is disposed. The reflecting mirror 23 is attached to the free end of a mirror arm 24 serving as a support member, and the base of the mirror arm 24 is inserted into a vertically extending slit 28 provided at the lower side of the upper box portion 5b. Moreover, this mirror arm 24 is provided so as to be movable up and down in the Z-Y and Z-2 directions by a pulse motor 26 and a feed screw 27 disposed inside the upper box portion 5b.

Said mirror arm 24. Slit 28. Pulse motor 2
6. A driving means 33 that uses a feed screw 27 to position the reflecting mirror 24 in front of an eye refractive power testing device 31, which is a self-conscious testing means to be described later, or to retreat from that position in the Z1 direction.
It consists of

That is, the reflecting mirror 24 reflects the light flux from the projection screen 9 to the testing position of the eye refractive power testing device 31 while being displaced in the Z2 direction, and reflects it to a non-testing position while being retracted in the Z1 direction. It is designed to perform selection operations.

The upper box portion 5b further includes the mirror arm 2.
A microswitch MS, which is connected to the light source 10 and serves as a light source driving means for turning on and off the light source 10, is arranged facing the displacement region 4.

An arm 29 serving as a support member is attached to the side of the upper box part 5b so as to be rotatable in the direction of the arrow 30 and movable relative to the subject M. An eye refractive power testing device 31 as a type of testing means is mounted movably.

FIG. 3 shows a circuit of the microswitch MS, the light source 10, and the power source E for the light source 10.

Next, the effect of the device J having the above configuration will be explained by the reflection mirror 24.
The following will mainly explain the displacement of the microswitch MS and the operation of the microswitch MS.

In the initial state, the reflecting mirror 24 is in front of the eye refractive power testing device 31 shown in FIG. It is assumed that the light flux from the projection screen 9 is incident on the subjective inspection device 31 based on the light from #10.

From this state, when the subjective inspection is completed and the examiner or an operation switch (not shown) sends a drive signal to the pulse motor 26, the pulse motor 26 starts, the feed screw 27 rotates, and the mirror arm 24 and the reflecting mirror 23 are rotated. is displaced in the direction of arrow Z1 and reaches the non-inspection position shown in FIG.

At this time, the mirror arm 24 contacts the microswitch MS, turning it off. As a result, the power supply to the light source 10 is cut off and the light source 10 is turned off. That is, the light source 10 is turned off in conjunction with the displacement of the reflective mirror 24 to the non-examination position, eliminating unnecessary power consumption when the visual acuity chart display means 8 is not in use.

When setting the reflecting mirror 24 to the inspection position, contrary to the case described above, the microswitch MS is set to the mirror arm 2.
Since there is no contact with the light source 4, the light source 10 returns to the on state and the light source 10 is automatically turned on.

Note that the mirror arm 2 is used instead of the micro switch MS.
It is also possible to use a photoelectric sensor or the like that detects the displacement of 4.

The present invention can be modified in various ways other than the embodiments described above.

In the embodiments described above, the case where the projection type visual acuity chart display means 8 was used was explained, or the eye refractive power testing device 31 and
Even in a device that uses a remote visual acuity chart display means with a built-in light source, for example, a microswitch or a sensor that detects a withdrawal operation from the test position of the eye refractive power testing device 31 to a non-test position may be used as the light source of the visual acuity chart display means. It is also possible to connect it to a circuit that includes a light source and automatically turn off the light source.

[Effects of the Invention] According to the present invention described above, with the above configuration, the light source of the visual acuity chart display means is turned on in conjunction with the selective reflection state of the reflection optical system by the operation of the light source driving means. Alternatively, the light can be turned off, and a self-conscious inspection device that does not consume unnecessary power can be provided.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of the device, and FIG. 3 is a circuit diagram of a microswitch and a light source in the device. 1...Subjective testing device, 8...Visual acuity chart display means, 1
2a...Optotype, 24...Reflection mirror, 31...
- Eye refractive power testing device, 35... Reflective optical MS... Micro switch.

Claims (1)

[Claims] an eye chart display means including a light source; a test means for subjectively performing a visual function test using the optotypes displayed by the eye chart display means; Or, in a self-aware inspection device equipped with a reflective optical system that selectively reflects the light to a non-inspection position, a light source that detects the state of selective reflection of the light beam by the reflective optical system to the inspection means and turns on or off the light source. A self-conscious inspection device characterized by being provided with a driving means.