JPS59126984A - Timepiece having eyesight testing pattern - Google Patents

Abstract

PURPOSE:To attain a timepiece capable of testing the user's eyesight by displaying an eyesight testing pattern. CONSTITUTION:When time display is designated, the time is displayed on an analog display part 5a and a digital display part 5b of a liquid crystal display device. When eyesight test is designated, the annular patterns (b) and (c) for the eyesight test are displayed on the analog display part 5a, and a determined eyesight is displayed on the digital display part as shown by (d).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a watch having a visual acuity test pattern capable of displaying a visual acuity test pattern.

[Technical background of the invention and its problems]

Conventionally, a pattern for visual acuity test is made by printing letters of various sizes, a ring with a missing =f4, etc. on paper, etc., and printing this from a point a certain distance away from 41 degrees σ). In addition, various patterns were placed inside a box, and the visual acuity was tested by looking at the patterns from the outside and determining whether they were correct or incorrect.
There are some that have been made to do so.

However, all of these devices are costly devices, and the test subject cannot perform the test himself; they always require an examiner, and people wanted to be able to test their visual acuity easily.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a watch with a visual acuity test pattern that allows the subject to easily perform a visual acuity test by himself or herself, and also has the functions of a watch. It is something to do.

[Summary of the invention]

That is, the present invention is characterized in that a watch having a liquid crystal display is configured to display a pattern for visual acuity test on the liquid crystal display by an external switching operation. An embodiment of the present invention will be described in detail with reference to the block diagram shown in FIG. In the figure, 1 is a clock circuit that divides the frequency of a stable reference signal such as a crystal oscillation circuit to obtain a clock signal with a period of, for example, 1 second, and counts this clock signal for 9 minutes.
C for obtaining a count value of the hour, etc., and 2 a first signal conversion circuit which converts the count value given from the clock circuit 1 in accordance with the display format of the display device. The converted output of the signal conversion circuit 2 is applied to an output circuit 4 via a signal switching circuit 3, and the output circuit 4 drives a liquid crystal display 5 to display the time. 6 is a random number generation circuit that provides random number information to the visual acuity test pattern.Then, the random numbers generated by the random number generation circuit 6 are applied to a second signal conversion circuit 7 to create a visual acuity test pattern. This visual acuity test pattern is ring-shaped and has a size specified by a control circuit 8, which will be described later, and the position of the edge cutout is determined based on the random number information.

Reference numeral 9 denotes an input circuit for switching between clock operation and visual acuity test operation 9, setting the time in clock operation, inputting a notch position in visual acuity test operation, etc. by external operation. The output of the input circuit 9 is then given to the control path 8 for clock operation.
The control circuit 8 provides switching signals for the visual acuity test operation and visual acuity test results to the signal switching circuit 3.The control circuit 8 also provides a time setting signal to the clock circuit 1, and provides the visual acuity test pattern to the second signal conversion circuit 7. The visual acuity determined as a result of the visual acuity test is given to the visual acuity storage circuit 10 and stored.

Note that the liquid crystal display 5 forms a pattern as shown in FIG. 2, for example. That is, in the analog display section 5a, a circular display section is divided concentrically into, for example, five parts, and each concentric circle is further divided radially into an angle of 5 degrees so that each segment can be selectively "t'b". In addition, the digital display section 5)) has a so-called 7-segment display in the shape of a Japanese character with 4 digits, and a colon is provided in the center.In FIG. 2, 9a, 9b, 9c, and 9d are input circuits. Therefore, in the case of clock operation, the analog display section 5a drives the segments corresponding to the analog time-open long hand 5B+ and short hand 5a2 in the radial direction. The digital display section 5b displays the time in numbers.Also, when conducting a visual acuity test, the segments of the analog display section 5a are displayed as shown in FIGS. 3(b) and 3(C). is displayed in a ring shape of a size specified by the control circuit 8, with a notch provided at the position according to the random number information from the random number generation circuit 6.Then, the subject reads the position of the notch and inputs the input circuit 9. The visual acuity is determined based on the correctness and the determined visual acuity is stored in the visual acuity memory circuit IO, for example, as shown in FIG. 3(d).
It is digitally displayed on the digital display section 5b as shown in FIG.

Therefore, the liquid crystal display 5 has extremely low power consumption, has sufficient practical performance as a display for a watch with a small battery capacity, such as a wristwatch, and has the advantage that any display pattern can be easily obtained.

With such a configuration, by specifying the clock display via the input circuit 9, the time can be displayed, for example, as shown in FIG. 3(a). Furthermore, when a visual acuity test is specified via the input circuit 9, as shown in the flowchart shown in FIG.
At TEP3, ``determine the notch position of the inspection pattern using random numbers'' based on the random number information from the random number generator 6, and perform 5TE.
In P4, "display the inspection pattern" is performed. Then, in 5TEP5, ``accept and accept the testee's response'' is performed, and further, in 5TEP6, it is determined whether the answer is correct.

If the testee's answer is "correct", use 5TEP7 to determine whether the size of the test pattern is the minimum, and if it is "not the minimum", use 5TEP8 to "decrease the size of the test pattern by one step." ” and return to 5TEP3 again. Also, if the answer in S TEP 6 is "incorrect", "Display visual acuity" is performed in 5TEP9. Even when the size of the test pattern is "minimum" in 5TEP7, "Display visual acuity" is performed in 5TEP9. "Display" and end the test with 5 TEPIO.

In this way, the visual acuity test can be carried out by the subject himself and does not require a large space.

It can usually be used as a tense, and it can be operated externally to test visual acuity, and the device is small.

It can be made lightweight.

Note that the present invention is not limited to the above embodiments,
For example, in the above embodiment, the visual acuity test pattern is made sequentially smaller from the largest diameter to the smallest diameter, but it may also be made sequentially larger from the smallest diameter to the largest diameter, or The inspection may start from the size of . Further, the shape of the segment may be changed to test for astigmatism as well as visual acuity, or the test may be performed in different ways.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily perform a visual acuity test by the subject himself, and the configuration can be simplified, small-sized, and lightweight since the analog display section of "L" can also be used as a visual acuity test pattern. A watch having a pattern for visual acuity testing can be provided.

[Brief explanation of the drawing]

Figure SR1 is a block diagram showing one embodiment of the present invention, Figure 2 is a front view showing the liquid crystal display of the above embodiment, Figure 3 is a diagram showing an example of the display of the liquid crystal display, and Figure 4 is the above. It is a flowchart which shows the procedure of the visual acuity test of an Example. DESCRIPTION OF SYMBOLS 1... Clock circuit, 5... Liquid crystal display, 5a... Analog display part, 5b... Digital display part, 6... Random number generation circuit, 9... Input circuit, 10... Vision memory circuit.

Claims (1)

[Claims] (1) A watch that displays the time on a liquid crystal display and has a pattern for visual acuity test, characterized in that the pattern for visual acuity test is displayed on the liquid crystal display in response to an external operation. (2) In the item described in claim 1, the analog display part of the liquid crystal display is divided into a plurality of circles, and is further divided into a plurality of segments at a constant angle in the radial direction, and the time is displayed. A watch having a visual acuity test pattern, characterized in that segments at positions corresponding to the long and short hands of an analog display are driven, and the visual acuity test pattern is displayed in a ring shape with a notch.