Elevator display unit

Abstract

To provide an elevator display device capable of determining an appropriate display device replacement time considering an environmental temperature and usage time per dot.SOLUTION: An elevator display device according to the present disclosure comprises a temperature measuring function to measure the environmental temperature of a dot-matrix LED indicator, a temperature average calculation function to calculate the average value of the environmental temperature measured by the temperature measuring function, a light intensity deterioration database storing the lighting time of the dot-matrix LED indicator at a reference temperature and characteristic data of the light intensity deterioration, a storage part of LED lighting time data to store the lighting time per dot controlled by the lighting control function, a light intensity calculation function to calculate the present relative light intensity corresponding to the environmental temperature average value from the environmental temperature average value, the characteristic data of light intensity deterioration, and lighting time data, and a life time determination function to determine the replacement time when the relative intensity per dot calculated by the light intensity function is below the determination value.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an elevator display device. [Background technology]

[0002] The elevator display device disclosed in Patent Document 1 below is a dot-type LED display installed at each elevator hall or inside the car to show the car position and operating direction, and has a means for automatically correcting deterioration over time of the brightness of each dot LED based on the individual lighting time of each dot LED. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-132118 A Summary of the Invention [Problem to be solved by the invention]

[0004] The elevator display device disclosed in Patent Document 1 does not take into account the effects of ambient temperature, and therefore has the problem of being unable to determine the appropriate time to replace the display device.

[0005] The present disclosure has been made to solve the above-mentioned problems. An object of the present disclosure is to provide an elevator display device that is capable of determining an appropriate replacement time for the display device, taking into consideration the ambient temperature and the usage time of each dot. [Means for solving the problem]

[0006] The elevator display device according to the present disclosure is an elevator display device that is provided in a landing or a car and uses a dot matrix LED indicator to display information including a destination floor, and includes an LED lighting control function that controls the lighting of the dot matrix LED indicator, a temperature measurement function that measures the ambient temperature of the dot matrix LED indicator, a temperature average value calculation function that calculates an average value of the ambient temperature measured by the temperature measurement function, a luminance degradation database that stores characteristic data of the lighting time and luminance degradation of the dot matrix LED indicator at a reference temperature, an LED lighting time data storage unit that stores the lighting time of each dot that is lighting-controlled by the lighting control function, a luminance calculation function that calculates the current relative luminance for each dot corresponding to the average ambient temperature from the average ambient temperature, the characteristic data of luminance degradation, and the lighting time data for each dot, and a relative luminance calculation function that calculates the current relative luminance for each dot corresponding to the average ambient temperature from the average ambient temperature, the characteristic data of luminance degradation, and the lighting time data for each dot. When the ratio of the maximum value to the minimum value exceeds the set value A lifespan determination function that determines when it is time to replace the product. Ta It is something. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide an elevator display device that can determine the appropriate time to replace the display device, taking into account the ambient temperature and the usage time of each dot. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing the configuration of an elevator display device for displaying the elevator car position, etc. [Diagram 2] FIG. 13 is a diagram showing details of a dot matrix LED indicator. [Diagram 3] This is a typical circuit diagram of a dot matrix LED indicator. [Figure 4] FIG. 1 is a diagram showing a display device of an elevator in accordance with a first embodiment. [Diagram 5] FIG. 11 is a diagram showing the relationship between lighting time and relative luminous intensity deterioration. [Figure 6]FIG. 13 is a diagram showing a display example of a dot matrix LED indicator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described with reference to the drawings. In each drawing, the same reference numerals are used to denote common or corresponding elements, and the description is simplified or omitted. The configurations shown in the embodiments below are examples of the technical ideas related to the present disclosure, and may be combined with other known technologies, or multiple technical ideas described in the present disclosure may be combined. In addition, it is also possible to omit or modify a part of the configuration without departing from the gist of the present disclosure.

[0010] Embodiment 1 FIG. 1 is a block diagram of an elevator display device for displaying the elevator car position and other information. An operation panel 1 is installed at the elevator landing or car. The operation panel 1 is used by passengers to specify destination floors and other information. An indicator board 2 is placed within the operation panel 1 at the landing or car. A dot matrix LED indicator 3 is mounted on the indicator board 2. A microcomputer 4 is mounted on the indicator board 2. The microcomputer 4 communicates with an elevator control panel 7 via a communication circuit 5 and a communication function 6 within the microcomputer 4, and based on the elevator car position information obtained through the communication, the LED lighting control function 8 within the microcomputer 4 displays the car position on the dot matrix LED indicator 3.

[0011] Next, Fig. 2 will be described. Fig. 2 is a diagram showing details of the dot matrix LED indicator 3. The dot matrix LED indicator 3 includes LEDs 9 arranged in a matrix, a common driver circuit 10 using transistors or the like, a segment driver circuit 12 using transistors or the like, and a microcomputer 14 for controlling these. The common driver circuit 10 outputs common select signals 11a to 11g. The segment driver circuit 12 outputs segment signals 13a to 13e.

[0012] The dot matrix LED indicator 3 displays numbers or alphabets by turning on the common select signals 11a to 11g one line at a time at regular intervals and turning on the segment signals corresponding to those common select signals. For example, to display "1", when the common select signals 11a, 11c to 11g are ON, only the segment signal 13c is ON, and when the common select signal 11b is ON, the segment signals 13b and 13c are ON, thereby lighting up the LEDs. Figure 3 is a general circuit diagram of the dot matrix LED indicator 3.

[0013] FIG. 4 is a diagram showing an elevator display device according to the first embodiment. In addition to the same configuration as in FIG. 1, the elevator display device of this embodiment includes a temperature sensor 15 arranged near the dot matrix LED indicator 3. The microcomputer 4 also includes a temperature measurement function 17, a temperature average value calculation function 18, a lighting time count function 21, a luminous intensity calculation function 23, and a lifespan determination function 24. The elevator display device of this embodiment measures the ambient temperature of the dot matrix LED indicator 3 by the temperature measurement circuit 16 connected to the temperature sensor 15 and the temperature measurement function 17. Furthermore, the temperature average value calculation function 18 connected to the temperature measurement function 17 calculates the average value of the measured temperatures after the hall or car operation panel 1 starts operating, and stores the value in the memory 19 as ambient temperature data 20.

[0014] The lighting time count function 21 counts the lighting time from the start of operation for each dot, and stores the value in the LED lighting time data storage section 22 in the memory 19. Fig. 5 is a diagram showing the relationship between lighting time and relative luminous intensity degradation. A luminous intensity degradation database 26 showing the relationship between lighting time and relative luminous intensity degradation as shown in Fig. 5 is stored in advance in the memory 19. This database stores two patterns, one for a standard temperature (e.g., 25°C) and one for a high temperature (e.g., 85°C).

[0015] Based on the average value of the ambient temperature data 20, the data stored in the LED illumination time data storage unit 22, and the luminance degradation database 26, the luminance calculation function 23 calculates the current luminance corresponding to the ambient temperature. Then, based on the luminance data calculated for each dot, the lifespan determination function 24 determines the lifespan, and if the lifespan has been reached, the communication function 6 transmits the information to the elevator control panel 7, and the management center is notified that the lifespan has been reached. This allows the maintenance person to notice the decrease in luminance, and allows maintenance replacement to be performed at an appropriate time. In this case, the communication function 6 and the elevator control panel 7 correspond to a communication unit that communicates the result to the outside when the relative luminance calculated by the luminance calculation function 23 falls below the determination value.

[0016] The following describes in detail the process from when the elevator hall or car operation panel 1 starts operating until the dot matrix LED indicator 3 reaches the end of its life.

[0017] First, the temperature of the dot matrix LED indicator 3 is measured by the temperature sensor 15, the temperature measurement circuit 16, and the temperature measurement function 17, and the measured temperature Ta1 and the number of measurements N are stored in the memory 19. Then, after a certain period of time, the temperature Ta2 is measured again and added to Ta1, and the resulting value is taken as Ta. By dividing this Ta by the number of measurements N, the average ambient temperature of the dot matrix LED indicator 3 from the start of operation of the hall or car operation panel 1 is calculated.

[0018] Next, a method for calculating luminous intensity by the luminous intensity calculation function 23 from the average value of the ambient temperature data 20, the data stored in the LED illumination time data storage unit 22, and the luminous intensity degradation database 26 will be described under the following assumptions. Figure 6 is a diagram showing an example of the display of the dot matrix LED indicator 3. <Condition> The dot matrix LED indicator 3 has three display options: "1", "2", and "3" (Figure 6). Assume that the operating time since the start of operation is 5,000 hours. During operating hours, the time displayed will be "1" 75% of the time, "2" and "3" 15% and 10% respectively. Under the above conditions, LED25, the dot in the center of Figure 6, lights up when it displays "1" and "3", so the lighting time is 5000 hours x 85% = 4250 hours. The calculated average ambient temperature is 30°C. In practice, the luminous intensity is calculated from the value counted by the lighting time count function 21.

[0019] Under the above conditions, the relative luminance of the LED 25 in Fig. 6 is calculated as follows. First, the relative luminance at 4250 hours is read from the luminance degradation database 26. From Fig. 5, it is approximately 86% when the ambient temperature is 25°C, and approximately 73% when it is 85°C. Next, if the relative luminance value that decreases when the ambient temperature rises by 1°C is calculated as (relative luminance (25°C) 86% - relative luminance (85°C) 73%) / (85°C-25°C), it can be predicted that the relative luminance will decrease by approximately 0.22% per 1°C. When the ambient temperature is 30°C, it can be predicted that there will be a decrease of 0.22% x (30°C-25°C) = 1.1%, so the relative luminance at an ambient temperature of 30°C after 5000 hours of operation can be predicted to be 84.9%.

[0020] The luminous intensity calculation function 23 calculates the relative luminous intensity for each dot in the same manner as described above. The lifespan determination function 24 determines that it is time to replace the indicator when the calculated relative luminous intensity falls below a determination value (e.g., 80%). This allows the lifespan to be determined taking into account the ambient temperature of the dot matrix LED indicator 3 and the lighting time for each dot, making it possible to optimize the replacement timing based on the lifespan.

[0021] Conventionally, the lifespan was set to 100% regardless of the dot, and the ambient temperature was set to the upper limit of the product specifications (e.g. 60°C), so if the calculation was performed under the above conditions, the LED 25 in Fig. 6 was predicted to be 78.4% if the operating time was 5000 hours. If the lifespan was determined to be reached when the relative luminance dropped to 80%, the lifespan would be approximately 10,000 hours if the calculation was made taking into account the ambient temperature and the lighting time of each dot LED, but approximately 4,000 hours if not. In this way, with this embodiment, it is possible to significantly extend the replacement time due to lifespan.

[0022] The end of life may be determined by setting a fixed value, or by comparing the relative luminance of each dot LED and determining when the difference is equal to or greater than a fixed value. For example, it may be determined that it is time to replace the LEDs when the ratio of the maximum and minimum values ​​of the relative luminance calculated for each dot is equal to or greater than a set value (e.g., 2x). This makes it possible to recommend replacement before the luminance variation between dots becomes noticeable.

[0023] The above configuration and method enable the indicator board 2 itself to determine the lifespan of the dot matrix LED indicator 3, taking into account the ambient temperature and the lighting time of each dot, thereby making it possible to optimize the replacement timing due to its lifespan. [Explanation of symbols]

[0024] 1 operation panel, 2 indicator board, 3 dot matrix LED indicator, 4 microcomputer, 5 communication circuit, 6 communication function, 7 elevator control panel, 8 lighting control function, 10 common driver circuit, 11a to 11g common select signals, 12 segment driver circuit, 13a to 13e segment signals, 14 microcomputer, 15 temperature sensor, 16 temperature measurement circuit, 17 temperature measurement function, 18 temperature average value calculation function, 19 memory, 20 ambient temperature data, 21 lighting time count function, 22 lighting time data storage unit, 23 luminous intensity calculation function, 24 life determination function, 25 LED, 26 luminous intensity degradation database

Claims

1. In an elevator display device that is installed in a landing or a car and displays information including the destination floor using a dot matrix LED indicator, An LED lighting control function for controlling lighting of the dot matrix LED indicator; A temperature measurement function for measuring the ambient temperature of the dot matrix LED indicator; a temperature average calculation function that calculates an average value of the ambient temperature measured by the temperature measurement function; a luminance degradation database storing characteristic data of the illumination time and luminance degradation of the dot matrix LED indicator at a reference temperature; an LED lighting time data storage unit that stores lighting times for each dot controlled by the lighting control function; a luminous intensity calculation function that calculates a current relative luminous intensity corresponding to the average value of the ambient temperature for each dot from the average value of the ambient temperature, the characteristic data of the luminous intensity deterioration, and the lighting time data for each dot; a lifespan determination function that determines that it is time to replace the dot when a ratio of a maximum value to a minimum value of the relative luminosity calculated for each dot by the luminosity calculation function becomes equal to or greater than a set value; An elevator display device equipped with the above.

2. An elevator display device as described in claim 1, which is equipped with a communication unit that communicates the result to the outside when it is determined that replacement is necessary.

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