JP2967863B2 - Visual inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual inspection device capable of diagnosing the degree of fatigue (self-diagnosis) by showing blinking light (flicker light) to a subject and inspecting the limit at which the light can flicker. Things.

[0002]

2. Description of the Related Art Conventionally, as a visual inspection device capable of performing self-diagnosis, there is, for example, one disclosed in Japanese Utility Model Laid-Open No. 60-104106 or Japanese Utility Model Laid-Open No. 63-106405. That is, a light-emitting element, a light-emitting element blinking control unit that controls blinking of the light-emitting element, a blinking operation unit that operates the light-emitting element blinking control unit to stop and grasp the blinking state, and a blinking value of the light-emitting element. A visual inspection device provided with a blinking value display unit for displaying is known.

[0003] These visual inspection devices look at the flashing light-emitting element while changing the flashing frequency of the light-emitting element, so that the light of the light-emitting element can be viewed as flashing light (intermittent light) or continuous light. By checking the blinking value of the light emitting element at the boundary when it is seen as blinking light or conversely, when it is seen as continuous light, the degree of fatigue of the visual system can be self-diagnosed. Therefore, such a visual inspection device can be said to be an inspection device having an advantage that self-diagnosis can be performed with a simple configuration.

[0004]

The conventional visual inspection device has the following problems. (A) Since the light emitting element is provided on the surface of the inspection device,
The external light may cause the blinking light of the light emitting element to be visually difficult to see or be difficult to distinguish, so that accurate diagnosis cannot be performed. In this case, if the blinking brightness of the blinking light is increased, a more accurate diagnosis can be made to some extent, but the degree of visual fatigue for the examination increases. (B) A blinking value display section for displaying a blinking value corresponding to a boundary between when the blinking light of the light emitting element appears as blinking light and when it appears as continuous light is provided on the back side or the handle of the inspection device. Therefore, there is difficulty in operability.

[0005] To solve the above problems, there is a visual inspection device as disclosed in Japanese Utility Model Application Laid-Open No. 7-5603. Things are desired. The present invention has been made in order to solve such a problem, and has a configuration in which the number of light-emitting elements is small, and a function can be achieved with a small number of control elements and a small scale. By
An object of the present invention is to obtain a small, lightweight, and inexpensive visual inspection device.

In order to achieve the above object, the present invention has a frequency variable means adapted to raise or lower a frequency controlled within a predetermined range, and corresponds to a frequency variable by the frequency variable means. When the flashing of the light emitting element is stopped, when the flashing of the light emitting element is stopped, the data corresponding to the flashing frequency at that time is displayed on the flashing data display section, and the flashing and display are performed in a cylindrical shape having an opening. In the visual inspection device in which the blinking and the display are made visible from the opening, the blinking data display section is formed by the tenth digit at the left end, the first digit at the center,
A 7-segment light-emitting display is used so that the right end is the first digit of the decimal point, and the center segment of the three central segments of the light-emitting display of the first digit is a light-emitting element that is controlled to blink, Switching between the display of the blinking data display section and the blinking of the light emitting element is provided by an operation switch on the outside of the case, and the decimal point light emitting element of the light emitting display of the 10th digit and the 1st decimal place is driven. Not to be provided, and the decimal point light emitting element of the light emitting display of the first digit is 2 out of 7 segments of the light emitting display.
The visual inspection device is configured to emit light by the logical sum signal of the segments.

[0007]

[0008]

Control of the variable frequency is such that when the switch is turned on, the blinking frequency increases at a predetermined rate,
A flashing value increasing switch configured to cause the light emitting element to blink at the increased blinking frequency when turned off, and a blinking frequency decreasing at a predetermined decreasing rate when turned on, and the decreasing blinking frequency decreasing when turned off. It is preferable that both switches of the blinking value lowering switch, which is made to blink the light emitting element in the above, be provided so as to be operated outside the cylindrical case.

In the visual inspection device constructed as described above, the 7-segment light-emitting display itself of the 7-segment light-emitting display itself of the blinking data display section for displaying the data corresponding to the blinking frequency, preferably the first-digit 7-segment light-emitting device Any one of the three central segments of the display itself, and more preferably, one of the three segments serves as a light-emitting element that is controlled to blink.

Since a switch that can be turned on and off is provided outside the cylindrical case, it is possible to easily switch between blinking of the light emitting element and display of the blinking data display section by operating the switch. It will be. The blink control signal of the decimal point light emitting element can be operated by the logical sum signal of the two segments. The switch can operate by changing the blinking frequency at a predetermined rise or fall rate.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view for explaining the entire structure, FIG. 2 is a front view of a printed circuit board on which electronic components are mounted, and FIG. 3 is a detailed diagram of the numerical display, FIG. 4 is a conceptual block diagram showing the entire electronic circuit, FIG. 5 is a flowchart of the operation, and FIG. 6 is a lit segment character shape and its truth table.

In this visual inspection device, a cylindrical case 1 having an opening at one end is formed to have an appropriate size by using a synthetic resin material, and an eyepiece 3 is disposed in the opening at one end. In the back, as shown in FIG. 2, the mounting substrate 2 is installed so as to be on the line of sight when viewed through the eyepiece 3, and a dry battery 4 for supplying power to the mounting substrate 2 is installed behind the mounting substrate 2. It has a configuration of The mounting board 2 is placed on one printed wiring board 5,
A blinking data display section including three display elements 6, a control microcomputer 7, a test start and blinking data display switch (hereinafter referred to as a display switch) 8, two blinking frequency control switches 9, and a display element The drive circuit has a configuration in which a display drive circuit (hereinafter referred to as a display drive circuit) 10 is all mounted.

Each of the display elements 6 of the blinking data display section is a 7-segment LED (light-emitting diode) having the smallest size among commercially available ones and emitting red light.
As shown in FIG. 3, this is a seven-segment light emitting display as a numerical display having seven segments 6 a to 6 g and a decimal segment 6 h and displaying numbers. Segments 6a to 6g of three mounted display elements 6
Are turned on / off from the port output of the control microcomputer 7 through the display drive circuit 10 by software, and can be driven arbitrarily. Arbitrary drive from software cannot be performed on the segment 6h of the decimal point. Further, among the three mounted display elements 6, the segment 6h indicating the decimal point of the left and right display elements is not connected and does not light.

In order to reduce the volume and weight, the control microcomputer 7 is preferably a microcomputer belonging to the smallest class having only three input ports and 11 input / output ports. As shown in FIG. 4, two of the input ports 11 are connected to the blinking frequency control switch 9, and the other one is an inspection terminal. Of the input / output ports 12 that can be divided into groups of three and eight, only one of the eight ports is programmed as an input and used for the display switch 8. The remaining seven are programmed as control outputs on the segment side of each display element 6 of the blinking data display section and connected to the display drive circuits 10a to 10g, and the three ports are similarly displayed for selecting display digits. It is connected to drive circuits 10i to 10k.

In this embodiment, it is assumed that the input is made by a switch so as to be the simplest method of communicating the intention from the test subject to the apparatus and that the volume and weight can be minimized. The frequency control switch 9 was used. The display switch 8 and the blinking frequency control switch 9 are connected to the input port 1 of the microcomputer 7 for control.
1 is directly connected. The display switch 8 and the blinking frequency control switch 9 are installed, for example, on the outer surface of the cylinder so that the display switch 8 and the blinking frequency control switch 9 can be operated with a fingertip from the outside of the cylindrical case 1.

The output sides of the display drive circuits 10i to 10k driven by the input / output port 12 of the control microcomputer 7 are connected to the collective terminals (common terminals) on the anode side of the three display elements 6 of the blinking data display section, respectively. Similarly, the output sides of the display drive circuits 10a to 10g are connected to the corresponding segment terminals on the cathode side of the segments 6a to 6g, respectively. In the embodiment, the display driving circuit 10h operates by the diode 13 with the logical sum signal of the signal corresponding to the 6c or 6e segment of the control microcomputer 7 to drive the segment 6h. It is not necessary to use a bulky and heavy one having many input / output ports.

In this embodiment, constant current control is performed by the display driving circuits 10a to 10h for driving the segments 6a to 6h so as to obtain the optimum brightness when looking into the apparatus. As a result, even if the battery terminal voltage falls,
The display element 6 of the blinking data display section can be illuminated with a constant luminance.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG. First, when the dry battery 4 is inserted into the battery case of the cylindrical case 1 (step 14), power is supplied to the control microcomputer 7 and the display drive circuit 10, and the control microcomputer 7 is reset. After reset
The software that operates on the control microcomputer 7 sets an initial blinking value of 25 Hz in the memory (step 15). After the initial setting, the control microcomputer 7 unconditionally enters the standby state (step 16). Since the control microcomputer 7 stops the clock oscillation in this standby state (step 16), the current consumption becomes extremely small. For this reason, the power switch can be omitted, and as a result, the volume and weight are reduced.

When the display switch 8 is pressed in the standby state (step 16), the software starts operating again. When the display switch 8 is pressed, the flashing value set on the memory at that time is displayed (step 17). At this point, the software does not start operating even if the blinking frequency control switch 9 is operated. When the display switch 8 returns to its original state (released) with the blinking value displayed, the segment 6g of the display element 6 at the center of the three blinking data display units starts blinking (step 18). , Other segments 6a-
6f and 6h are all turned off.

In this embodiment, the blinking display state (step 1)
When the center segment 6g is blinking in 8), there are four types of software options. First, when the display switch 8 is operated, the display shifts to the blinking value display state (step 17) as described above, and the blinking value at that time is displayed. When the flashing frequency control switch 9 is operated, the flashing value in the memory is raised or lowered while the flashing display state (step 18) remains flashing, and the flashing is advanced or slowed according to the cycle indicated by the flashing value. Or perform an action. Further, if neither the display switch 8 nor the blinking frequency control switch 9 is operated in the blinking display state (step 18) for a certain period of time, the subject returns to the standby state (step 16) assuming that the subject does not intend to operate. From the point of view, the power is turned off.

In the blinking display state (step 18), the subject visually observes the blinking of the segment 6g from outside the cylindrical case 1 through the eyepiece 3, and makes a self-diagnosis based on whether or not the blinking appears continuously. If it appears to be blinking, the blinking value is increased while the Up switch 9a of the blinking frequency control switch 9 is being depressed (step 19), and released when it appears to be continuously lit. Also, if it looks like continuous lighting at this time, the Down switch 9b of the blinking frequency control switch 9 is operated to lower the blinking value (step 20), and the Up switch 9a is again operated to turn the blinking value up to the point where continuous lighting is seen. Perform the operation of raising. As for the blinking value at the time when the subject appears to be continuously lit, in other words, the flicker value, the display switch 8 is pressed again to display the blinking value on the display element 6. That is, the blinking value can be known by setting the blinking value display state of the present apparatus (step 17).

The present invention is not limited to the above-described embodiment, but includes a configuration that can be modified and implemented without changing the gist. By the way, in the above embodiment,
Although the example in which the segment 6g is shared between the blinking value display state (step 17) and the blinking display state (step 18) has been described, the segment 6a or the segment 6d may be used, or another segment may be used. . Further, the segment may be a digit at the tenth digit or a digit at the first decimal place. However, the blinking is more preferable in the center, the first digit is easier to see, the center segments 6a, 6g, and 6d are easier to see, and the center segment 6g is most easy to see.
In any case, it is necessary that the segment is not connected to the decimal point segment 6h.

The display switch 8 is used to switch between the blinking value display state (step 17) and the blinking display state (step 18).
When the two switches, ie, the down switch 9b and the down switch 9b are operated, the display is switched from the blinking value display state (step 17) to the blinking display state (step 18), the display switch 8 may become unnecessary, and further printing may be performed. The area of the wiring board 5 can be reduced, which leads to reduction in volume, weight and cost.

Furthermore, as an example of a method for lighting the segment 6h, the segment 6c and the segment 6e are turned on by a logical sum. However, the method is not limited to the combination of the segment 6c and the segment 6e, but the combination of the segment 6a and the segment 6b. Or segment 6f and segment 6
FIG. 6 shows that the combination of b is also possible.

Next, in the above embodiment, the case where the flicker frequency is directly displayed on the numeric display device has been described. However, the present invention is not limited to the case where the flicker frequency is directly displayed. If the ratio is displayed in% or the ratio is scored based on a certain standard, the number of display digits can be further reduced, and a favorable effect can be obtained.

[0027]

Since the present invention is configured as described above, the following effects can be obtained. Flashing value display state (step 17) and flashing display state (step 18)
Use the same display element 6. In other words, it is possible to perform blinking display without providing an element such as a light emitting diode for the blinking display state (step 18), and it is not necessary to prepare a port of the control microcomputer 7 for driving the blinking display. Will be done. As a result, the semiconductor package can be small, and the function can be achieved without using a large-area printed wiring board 5, so that this inspection apparatus can be provided small, light, and inexpensively.

The blinking value display in the blinking value display state (step 17) and the blinking display in the blinking display state (step 18) are distinguished depending on whether the display switch 8 is pressed or not. According to the present invention, it is possible to switch between the blinking value display state (step 17) and the blinking display state (step 18) with one operation of the display switch 8, and the blinking value displayed on the display element 6 is displayed. Can be reduced to one switch.

In this embodiment in which the display element 6 is shared between the blinking value display state (step 17) and the blinking display state (step 18), the flicker value is reduced to one decimal place in the blinking value display state (step 17). In order to display, the central digit segment 6h of the display element 6 must be turned on. However, in the blinking display state (step 18), there is no need to turn on the light. Therefore, in the present invention, focusing on the difference, the lighting conditions other than the segment 6g indicate that the segment 6h
Are derived from the truth table of FIG. In this embodiment,
As described above, the segment 6h is turned on by the logical sum of the segment 6c and the segment 6e. As a result, the segment 6h lights up in the blinking value display state (step 17) and blinks in the blinking display state (step 1).
In the case of 8), the light is turned off, so that the object can be achieved even if the segment 6h cannot be controlled by software. According to the present invention, it is not necessary to provide a special port for the segment 6h in the control microcomputer 7, so that the semiconductor package can be small, and the function can be achieved without using a large-area printed wiring board 5. This means that this visual inspection device is small, light,
It can be expected that it can be provided at low cost.

As described above, by using the flashing frequency control switch 9 as a switch, the input of the control microcomputer 7 can be a simple digital port, and a counter with an up / down determination circuit, an analog-digital converter, and the like are provided. It is not necessary to use the control microcomputer 7 that has been used. Generally, the control microcomputer 7 having a counter with an up / down determination circuit, an analog-digital converter, and the like often requires a large-area printed wiring board 5, which also makes this visual inspection device small and light. And can be provided at low cost.

As described above, according to the present invention, it is possible to reduce the size and the number of light-emitting elements, and it is possible to perform the function with a small number and scale of control elements to be used. As a result, the area of the printed circuit board on which the element is mounted may be small, and the entire visual inspection device constituted by the device can be configured to be small, light, and inexpensive. Want to"
Can respond to the request of the subject.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a visual inspection device of the present embodiment.

FIG. 2 is a mounting diagram of a printed circuit board on which electronic components of the present embodiment are mounted.

FIG. 3 is a detailed view of a segment of a numeral display used in the present embodiment.

FIG. 4 is a conceptual block diagram of the present embodiment.

FIG. 5 is a flowchart showing a control state of the present embodiment.

FIG. 6 shows a lit segment character shape and a truth table thereof according to the present embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cylindrical case 2 Mounting board 3 Eyepiece 4 Dry battery 5 Printed wiring board 6 Display element (segment 6a-6h) 7 Control microcomputer 8 Inspection start and blinking value display switch (display switch) 9 Flashing frequency control switch (Up switch) 9a-Do
wn switch 9b) 10 display drive circuit (10a to 10k) 11 input port 12 input / output port 13 diode 14 dry battery insertion 15 setting of initial blinking value 25Hz 16 standby state 17 blinking value display state 18 blinking display state 19 increase blinking value Operation (Up) 20 Operation for decreasing the blinking value (Down)

Claims (2)

(57) [Claims] A frequency control unit configured to raise or lower a frequency controlled within a predetermined range;
The light emitting element blinks in accordance with the frequency that is changed by the frequency varying means, and when the blinking of the light emitting element is stopped, data corresponding to the blinking frequency at that time is displayed on a blinking data display unit, The blinking and display are performed inside a cylindrical case having an opening, and in the visual inspection device in which the blinking and the display can be viewed from the opening, the blinking data display section has the leftmost 10th place. The 7-segment light-emitting display is used so that the digit, the center is the first digit, and the right end is the first digit, of which the center segment of the three central segments of the first digit is shown. Is a light-emitting element that is controlled to blink, and is provided so that switching between display of the blinking data display section and blinking of the light-emitting element can be performed by an operation switch on the outside of the case. And the decimal point light emitting element of the light emitting display of the first digit is provided so as not to be driven, and the decimal point light emitting element of the light emitting display of the first digit is two of the seven segments of the light emitting display. A visual inspection device configured to emit light according to a logical sum signal of: 2. The variable frequency control includes: a blinking value at which a blinking frequency increases at a predetermined rate when a switch is turned on, and a light emitting element blinks at the increased blinking frequency when the switch is turned off. Up switch and O
When the N is set to N, the blinking frequency decreases at a predetermined decreasing rate, and when the switch is turned off, the light emitting element blinks at the decreased blinking frequency. The visual inspection device according to claim 1, wherein the visual inspection device is provided so as to be operated by a user.