JPH049048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a visual acuity testing device used in optometry.

BACKGROUND ART Conventionally, there have been two types of optotypes used for optometry: a reflective type and a transmissive type. The reflective type has been used for a long time, and has a visual acuity mark and an astigmatism mark printed on a piece of paper, and is used by verifying this from the surroundings. There are two types of transparent type: an integrally fixed type and a roll-in type.The integrally fixed type has a full visual acuity mark drawn on one side of a milky white plate, and is used by illuminating it from the back. The roll-winding type has a visual acuity mark drawn on a strip-shaped roll film, and is used by presenting a predetermined visual acuity mark while winding the roll and illuminating it from the back of the film.

Problems to be Solved by the Invention The above-mentioned reflective type and integrally fixed type of transmissive type have all the necessary charts on one side, so the examinee can view each chart while changing the line of sight. I will see it. Ideally, the line of sight should be directed straight ahead at eye level, but it is undesirable to have to move the line of sight over a wide range like this. On the other hand, the roll winding type in the transmission type is
Since the prescribed visual acuity charts are presented one after another while the roll is being wound up, the above-mentioned line of sight problem is solved, but since the film is in the form of a band, it is difficult to quickly display the charts by feeding them one after the other. However, if you want to move from the first chart to the last chart, you will have to move through each chart, which is time consuming and undesirable.

Means for Solving the Problems The present invention provides a chart board for a plurality of test targets, a moving drive means for moving the chart board between a setting position and a storage position, and a method for moving the chart board. The selection means is used to drive the moving drive means so that the paper can be selectively taken out.

Function: According to this, the selection means drives the moving drive means, and the chart board to be presented can be quickly set at the set position.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 1, a plurality of chart boards 1 are inserted into respective slide grooves 3, 3' of a holding member 2, and are constantly
It is stored in the right position in the figure as shown by the solid line, and as described later, the designated chart board is guided from this storage position to the grooves 3 and 3' and moved to the left position shown in the two-dot chain line in the figure. This position constitutes a visible position during the visual acuity test, that is, a fixed position from which the subject looks at the optotype. The drive arm 4 is L-shaped and movable parallel to the grooves 3 and 3' by being guided by a guide 5 integrated with the holding member 2, and has an electromagnet 6 at a position facing each of the chart plates 1. It is installed. One end surface portion 7 of each chart board 1 has a part facing each electromagnet 6 as an adsorption part, and when each electromagnet 6 is activated, the chart board 1 facing the electromagnet is attracted to this and driven. It is designed to move together with the arm 4. The motor 8 is fixed integrally with the holding member 2 and directly connected to the pinion 9. The pinion 9 is engaged with the rack 10 of the drive arm 4, and the reversible rotation of the motor 8 causes
The drive arm 4 is adapted to move from side to side in the figure. The electromagnets 4 and the motors 8 are operated by a control box 12 as a separate selection means, and the movement of each chart board 1 can be specified by operating the push buttons of the control box 12. 4 is activated selectively.

In the above configuration, when one of the electromagnets 4 is selected and activated, the chart board 1 facing the electromagnet is attracted and becomes integrated with the drive arm 4, and the motor 8 rotates counterclockwise. The chart board 1 is then placed in a visible position as indicated by the two-dot chain line in the figure. The subject can see the visual target at this position. Next, when another electromagnet 4 is selected, the motor 8 rotates clockwise, the chart board 1 is returned to the storage position shown by the solid line, and the newly selected electromagnet is activated. The opposite chart board is attracted to this in the same manner as described above, and becomes a visible position.

FIG. 2 shows another embodiment, in which the chart boards 1 and 1' are stacked to make the stacking thickness as thin as possible when stored, and to allow more chart boards to be provided. , the storage position in the storage member 2' is divided into two locations. Each electromagnet 6 has a chart board 1, which is housed in the same slide groove 3''.
1', in this case chart board 1,
The selection of 1' is made by a combination of the selection of the electromagnet 4 and the designation of the rotation direction of the motor 8.

FIG. 3 shows yet another embodiment, in which the chart plate 1'' is pivotally attached to a shaft 11 directly connected to the output shaft of the motor 8, and the drive arm 4' is fixed to the shaft 11 to connect the motor 8. The chart board 1'', which is attracted to the electromagnet 6, is rotated 90 degrees from the stored position to a position where it can be viewed.

Effects of the Invention As described above, according to the present invention, since any one of a plurality of chart boards can be selectively taken out and designated, the chart board to be presented can be quickly set. The subject can then view the chart while keeping the visual target aligned with the set position.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the main part structure of a visual acuity testing device showing a first embodiment of the present invention, FIG. 2 is a schematic diagram showing the main part structure of a second embodiment of the invention, and FIG. FIG. 3 is a schematic diagram showing the configuration of main parts of a third embodiment of the present invention. 1, 1', 1''... Chart board, 4, 4'... Drive arm, 6... Electromagnet, 8... Motor.

Claims (1)

[Scope of Claims] 1. A chart board for a plurality of test optotypes, each of which is movable between a setting position during a visual acuity test and a storage position; and a selection means for selecting the moving drive means to select one of the chart boards and reciprocate between the setting position and the storage position. A visual acuity testing device.