JPH0722701U - Visual acuity test equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an easy-to-use visual acuity table that enables accurate visual acuity testing, makes the device compact and lightweight. In a visual acuity chart in which a light emitting source is arranged on the back surface of a display body displaying a predetermined optotype and the optotype is configured to present the optotype with a predetermined brightness, the optotypes 10 are arranged in a vertical arrangement on an optotype plate. The EL panel 1 that emits white light while being fixedly arranged and divided into a plurality of stages on the back surface of the optotype plate according to the vertical arrangement of the optotypes 10
8 is attached so that the EL panel 18 can be individually controlled for lighting.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a visual acuity test device.

[0002]

[Prior art]

 Since the visual acuity test device displays a predetermined visual target such as Landolt's ring on the surface of the visual target plate, it is used for the visual acuity test when the subject visually recognizes the visual target several meters away. The visual acuity test device is a fixed placement type in which large and small size visual targets that are determined according to the visual acuity are displayed on the visual target plate in a predetermined arrangement, or a film that displays the visual target is rolled up and the visual target is placed in the opening window. There are two types, one is that the panels are displayed, and the other is that multiple panels displaying optotypes are prepared and the panels are switched according to the eyesight at the time of inspection. 4 and 5 are a front view and a side view of a conventional type visual acuity test apparatus in which optotypes are fixedly arranged.

By the way, when a visual acuity test apparatus is used, a visual target is clearly indicated with a constant brightness so that an accurate test can be performed. For this reason, for example, in a conventional visual acuity test apparatus in which optotypes are regularly arranged, the optotype plate is milky white and an illumination tube is installed on the back side of the optotype plate to clearly indicate the optotype. In addition, it is necessary to instruct the examinee which visual target to be visually recognized during the examination, but in a visual acuity test device with fixed visual targets, the visual targets are divided into multiple stages and the illumination tube is installed at each stage. Some of them are installed to clearly indicate the optotypes on a step-by-step basis, or a separate illumination tube is installed for each optotype so that each optotype can be clearly indicated.

[0004]

[Problems to be solved by the device]

 As described above, in order to perform an accurate examination using the visual acuity test device, it is important to be able to display the visual target at a constant brightness. In this respect, the conventional visual acuity test device uses a tube such as a fluorescent light tube for illumination, so that there is flicker due to the tube, and because multiple tubes are arranged, the entire visual target plate is uniform. There was a problem that the brightness was uneven and the brightness was uneven. In addition, the ground color of the optotype plate must be white, but depending on the tube, it may have a yellowish color.Therefore, the blue film can be transmitted to illuminate the optotype plate and the tube can be installed. The interior of the target plate was colored blue so that the base color of the optotype plate was white.

In addition, since a bulb is used for illumination, the life of the lamp can be maintained at a predetermined level, and when a filament-containing fluorescent lamp is used, the bulb suddenly cuts and the visual acuity inspection device cannot be used. There was also a problem. Further, when using a tube, the visual acuity test device is formed in a box shape in order to store the tube, so there is a limit in downsizing the device. The present invention has been made to solve these problems, and its purpose is to present a target with a uniform lightness, which enables an accurate inspection and increases the life of the device. It is an object of the present invention to provide a visual acuity test device that can be extended and can be made compact.

[0006]

[Means for Solving the Problems]

 The present invention has the following configuration to achieve the above object. That is, in a visual acuity test apparatus in which a light emitting source is arranged on the back surface of a display body displaying a predetermined optotype so as to present the optotype with a predetermined brightness, an EL panel that emits white light is detached as the light emitting source. It is characterized by being attached as much as possible. In addition, the optotypes are fixedly arranged in a vertical arrangement on the optotype plate which is the display body, and EL panels are attached by dividing into a plurality of stages in accordance with the longitudinal arrangement of the optotypes, and the EL panels are individually turned on. It is characterized by being controllable.

[0007]

[Action]

 Since the visual acuity test apparatus according to the present invention uses the EL panel as a light source for clearly indicating the visual target, the visual target can be uniformly shown over the entire range of the display body having a large area. Enables accurate inspection. Further, by using the EL panel, it is possible to make the device thin, compact, and have a long life. Further, by providing the EL panels in a plurality of stages in accordance with the vertical arrangement of the optotypes, the presentation of the optotypes can be facilitated, and at the same time, the exchange of the EL panels can be facilitated. .

[0008]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view of an embodiment of the visual acuity test apparatus according to the present invention, and FIG. 2 is a partial sectional side view. The visual acuity test apparatus according to the embodiment displays the visual target 10 such as a Landolt ring on the front surface in a predetermined arrangement, as in the conventional visual acuity test apparatus in which visual targets are fixedly arranged. The optotype 10 is provided by being printed or attached on a transparent chart plate 12 as a display body, and the chart plate 12 is supported by a panel body 14 formed in a rectangular frame shape. The surface of the chart plate 12 is subjected to antireflection treatment.

As shown in FIG. 2, an EL (electroluminescence) panel 18 is installed on the back surface of the chart plate 12 so as to be in contact with the chart plate 12. The EL panel 18 is attached to the back plate 20 of the panel body 14 using the bracket 22. In the embodiment, as shown in FIG. 1, the EL panels 18 are divided into six stages at equal intervals in the vertical direction, and each EL panel 18 is individually replaceable. The optotypes 10 are arranged in the vertical direction according to visual acuity, and by dividing the EL panel 18 into steps, it is possible to clearly indicate a predetermined visual range for each step.

FIG. 3 shows a connection circuit diagram of the EL panel 18. Each EL panel 18 is connected to a control unit 26 via a connector 24 to control light emission. In the embodiment, the EL panel 18 is operated to be turned on and off by the remote control method, and therefore the receiving window 30 for remote control is provided at the lower edge of the panel body 14. The control unit 26 controls ON / OFF of a predetermined EL panel 18 by remote control.

Since the EL panel 18 emits surface light with a uniform brightness, it is possible to display the optotypes 10 in the stage with required brightness by causing the EL panels 18 in the stage to emit light. The EL panel 18 used in the practical example is pink when no light is emitted and white when light is emitted. Therefore, when no light is emitted, the optotype 10 is displayed and visually recognized on the pink background color, and when the EL panel 18 is turned on, the optotype 10 1 is vividly highlighted and visually recognized in the white backlight.

The EL panel 18 is used by setting it to a required brightness required for inspection. However, since the brightness of the EL panel 18 decreases as it is used, when the brightness falls below a predetermined brightness, the brightness is reset so that it becomes a predetermined value or higher before use. Further, when the required brightness cannot be obtained, the EL panel 18 at the relevant stage is replaced with a new product. In the case of the embodiment, the EL panel 18 is lit up and used for each stage. However, when the EL panel 18 is fully lit up, there is a possibility that the brightness of each stage may vary due to the replacement of the EL panel 18, etc. Therefore, there is also a reason that the difference in brightness of each step cannot be recognized by the examinee by lighting each step.

When the EL panel 18 is used for illuminating the optotype 10 as in the embodiment, the EL panel 18 uniformly emits surface light, so that the uneven brightness when the optotype 10 is displayed is ensured. Can be prevented. That is, it is possible to illuminate the optotype 10 1 located at any position in the optotype plate with the same brightness, and improve the inspection accuracy. In addition, by using the EL panel 18 that emits white light, the ground color of the optotype plate can be made to be an appropriate white color, which enables an accurate inspection. In addition, the EL panel 18 has the advantage that it can display a stable optotype without flicker of brightness like a tube due to its nature. Further, the brightness of the EL panel 18 gradually decreases, but there is an advantage that the device does not become unusable due to sudden disconnection like a tube. In the conventional device using the tube, the life of the tube is about 300 to 500 hours, but in the case of using the EL panel 18, the life is at least twice as long as that of the conventional device.

When the EL panel 18 is used, the device can be made thinner than when a tube is used. This is because the EL panel 18 is a thin body. In the visual acuity test apparatus of the embodiment, the thickness of the optotype surface portion is 20 mm, which is about ⅕ the thickness of the conventional apparatus. Further, by using the EL panel 18, the weight of the device can be reduced. The conventional visual acuity test apparatus as shown in FIG. 4 has a weight of about 15 to 20 kg, but the apparatus of the embodiment has a weight of 2.7 kg and is extremely lightweight. As a result, the visual acuity test apparatus can be easily transported and handled, and can be easily used as a wall-mounted type because it is thin and lightweight. In this way, this device can be provided as an extremely easy-to-use visual acuity test device.

The actual product is not limited to the form of the above embodiment, and it is needless to say that various modifications can be made. For example, in the above-mentioned embodiment, the EL panel 18 is divided for each stage, but it is also possible to divide the EL panel 18 in the vertical direction so that each column is turned on. Further, instead of lighting a plurality of optotypes at once, each optotype 10 can be individually turned on. In this case, it is necessary to divide the EL panel for each optotype 10 and individually connect the circuits. Further, in some cases, the EL panel may not be divided, but may be configured to be a single sheet and to light up the entire surface at once.

Further, the above embodiment is an example of the visual acuity test apparatus in which all the required visual targets are displayed on the visual target plate. The same can be applied to the case where the device is configured to be rolled up to present the optotype in the opening window, or the device where the panel displaying the optotype is replaced and used. In the case of these devices as well, by placing an EL panel similar to the above example on the back side of the optotype display body instead of the tube, the optotype can be clearly indicated, and high-precision inspection can be performed. Will be able to do. Also, in the case of these visual acuity test devices, the device can be made compact by using the EL panel, and can be provided as a device with good usability. Further, by using the EL panel, the reliability of the device can be improved and the life of the device can be extended.

[0017]

[Effect of device]

 According to the visual acuity test apparatus of the present invention, as described above, the EL panel is used and the visual target is presented by the surface emission of the EL panel, so that the visual acuity test can be performed with high accuracy. become. Further, the device can be made thin and compact, and the device can be formed to be lightweight, so that the visual acuity test device having good usability can be provided. Further, when the EL panel is divided into a plurality of stages, the EL panel can be easily replaced and the optotype can be easily displayed.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the visual acuity test apparatus according to the present invention.

FIG. 2 is a partial cross-sectional side view of an embodiment of the visual acuity test device.

FIG. 3 is a circuit connection diagram of an EL panel.

FIG. 4 is a front view of a conventional visual acuity test device.

FIG. 5 is a side view of a conventional visual acuity test device.

[Explanation of symbols]

 10 optotype 12 chart board 14 panel body 18 EL panel 20 back plate 22 bracket 24 connector 26 controller 30 reception window

Claims (2)

[Scope of utility model registration request] 1. A visual acuity table in which a light emitting source is arranged on the back surface of a display body displaying a predetermined optotype so as to present the optotype with a predetermined brightness. A visual acuity test device characterized by being detachably attached. 2. An optotype is fixedly arranged in a vertical arrangement on an optotype plate which is a display body, and EL panels are attached by dividing the optotype into a plurality of stages according to the longitudinal arrangement of the optotypes, and the EL panels are individually arranged. The visual acuity test device according to claim 1, wherein the lighting control is possible.