JPS6027369B2 - Photoelectric electronic scale - Google Patents

Description

[Detailed description of the invention] This invention relates to improvements in photoelectric electronic scales.

In recent years, with the development of LSI and the spread of CMOSIC, electronic devices have become lower in power consumption, and calculators and the like have already come to be driven by batteries.

However, in photoelectric electronic scales, a light source with relatively high power is used in the photoelectric conversion section, so there is a problem in that the power consumption is large and battery operation is difficult. This invention was devised to solve these problems, and it is possible to reduce the power consumption of the photoelectric conversion unit, easily realize battery operation, and not only do not interfere with weighing work. The purpose is to provide a photoelectric electronic scale.

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes an object to be measured placed on a saucer 2, and 3 is a scale plate provided to move up and down in response to the vertical movement of the saucer 2, for example.

The scale plate 3 is, for example, a metric scale value encoded by slits, and the metric scale value of this scale plate 3 is read by a photoelectric conversion section 4. The photoelectric conversion unit 4 is connected to a scale value detection unit, which has a light source lamp with relatively large power consumption on one side and a light receiver on the other side, with the scale plate 3 in between, and converts the output of the light receiver into a digital pulse number signal. It consists of a conversion section that converts into . Counting the pulse number signal output from the photoelectric conversion unit 4 with a counter 5,
This count data is supplied to the arithmetic processing section 6. The arithmetic processing section 6 rounds the input count data to, for example, 5 ta units, and outputs it to the display section 7 as weight data. The display section 7 displays the input weight data numerically. The photoelectric conversion section 4 is connected to a power source 8 via a switch 9. A detection unit 10 detects whether the scale plate 3 is at the zero position, and when it is at the zero position, a high level signal is output to one input end of the two-input AND gate 11. A high level key operation signal is also input from the keyboard 12 to the other input terminal of the AND gate 11. Therefore, when a key is operated while the scale plate 3 is at the zero position, a signal is output from the AND gate 11. The output of the AND gate 11 is supplied to a control section 14 and a switch drive circuit 15, respectively. Further, when the weight data calculated by the arithmetic processing section 6 becomes zero, the weighed value zero determination section 16 detects this and outputs a high level signal, and the timer section 17 is set in response to the output. The timer section 17 performs a set operation as long as the zero position detection output is continuously inputted from the determination section 16, and when the set operation continues for a predetermined period of time, it sends out a time-up output. The output of the timer section 17 is then supplied to the switch drive circuit 15 and the control section 14. The switch drive circuit 15 drives the switch 9
When the output of the timer section 17 is input, the switch 9 is driven to open and the AND gate 11 is driven to open and close.
When the output is input, the switch 9 is driven to close. When the output of the AND gate 11 is input, the control section 14 resets the counter 5 and causes the display section 7 to display zero, and when the output of the timer section 17 is input, the character "L" is displayed on the display section 7. I am trying to display it. In the apparatus according to the embodiment of the present invention having such a configuration, processing is performed based on the flowchart shown in FIG.

That is, when the numeric keypad or other function keys are operated on the keyboard 12 for weighing, and at that time the scale plate 3 is stable at the zero position, the detection unit 10 detects
When a high-level signal is output, the switch drive circuit 15 operates according to the AND gate 11 output.
will be opened. Thus, the photoelectric conversion section 4 comes to be connected to the power source 8. Further, the counter 5 is reset by the control section 14, and the display section 7 displays zero. In this way, the object to be weighed 1 is placed on the tray 2, and the weighing operation is started. That is, the scale of the scale plate 3 is detected by the photoelectric converter 4 and converted into a digital pulse number signal, and the pulse number signal is counted by the counter 5. Then, the count data of the counter is extracted by the arithmetic processing section 6, rounded to required weight data, and displayed on the display section 7. When the weighing operation is completed and the object 1 to be weighed is removed from the tray 2, the weight data in the arithmetic processing section 6 returns to zero. The timer section 17 is energized by the weighing value zero determination section 16, and when the state of zero weight data continues for a predetermined period of time, the timer section 17 eventually times up, and the time-up signal is used to drive the switch drive circuit. 15 operates to open switch 9. Thus, the power to the photoelectric conversion section 4 is cut off. Then, when the scale plate 3 stably reaches the zero position again and key operations on the keyboard 12 are started, the switch drive circuit 15 is activated by the AND gate 11 output, and the switch 9 is closed. In this way, when the zero value of the weight data calculated by the arithmetic processing unit 6 continues for a predetermined period of time, the power to the photoelectric conversion unit 4 is cut off. As soon as an object is removed from the tray 2, the power to the photoelectric conversion unit 4 is cut off, so the power consumption of the photoelectric conversion unit can be reduced, and the device can easily be driven using a battery. It becomes possible.

Moreover, the power supply is stopped only when the state of zero data continues for a predetermined period of time, so there is no inconvenience caused by the power supply being stopped during continuous weighing. It does not interfere with the weighing work.
In addition, when starting the next weighing operation after a weighing operation has finished, unless the weighing has stabilized to zero, the power to the photoelectric conversion section will be turned on and the weighing will not be able to start.
Weighing can always be started from a stable zero state, and accurate weighing processing can be performed.

[Brief explanation of the drawing]

The figures show an embodiment of the invention, with FIG. 1 being a block diagram showing the circuit configuration, and FIG. 2 being a flow chart showing the processing process. 3... Scale plate, 4... Photoelectric conversion section, 6
...... Arithmetic processing section, 7... Display section, 8...
...Power supply, 9...Switch, 10...Detection unit, 11...And gate, 12...Keyboard, 15...Switch drive circuit, 16...・・・
-Weight value zero discrimination section, 17...Timer section. Figure 2: Ship

Claims (1)

[Claims of Claims] 1. A photoelectric conversion unit that illuminates a scale plate driven in accordance with a weighing operation to read the scale, and outputs an electrical signal in accordance with the scale value, and calculates the output of this photoelectric conversion unit. In a photoelectric electronic scale equipped with an arithmetic processing section that processes and outputs digital weight data, and a display section that displays the weight data from this arithmetic processing section, when the weight data calculated in the arithmetic processing section is zero, and means for cutting off power to the photoelectric conversion unit when the determination means continues to determine that the weight value is zero for a predetermined period of time. A photoelectric electronic scale that is characterized by: 2. A photoelectric conversion unit that illuminates a scale plate driven in accordance with the weighing operation to read the scale and outputs an electrical signal corresponding to the scale value, and a photoelectric conversion unit that processes the output of this photoelectric conversion unit to generate digital weight data. In a photoelectric scale equipped with an arithmetic processing section that outputs weight data and a display section that displays weight data from the arithmetic processing section, it is determined whether or not the weight data calculated in the arithmetic processing section is zero. A means of determining,
means for cutting off the power supply to the photoelectric conversion unit when the state of zero weighing value is continuously preset and determined for a predetermined time by the discriminating means; and means for detecting the zero weighing position of the scale plate; When a new weighing operation is started, it is checked whether the zero weighing position has been detected by the detection means, and when it is determined that the zero weighing position has been detected, the power to the photoelectric conversion section is cut off. A photoelectric electronic scale characterized by comprising means for releasing the state.