JPS5973737A - Speaker system inspecting apparatus - Google Patents

Abstract

PURPOSE:To eliminate personal difference in inspection conducted by workers and to speed up the inspection, by performing all the inspections of the characteristics of speakers on manufacturing lines by computers. CONSTITUTION:Specification values are sent to computers 8a, 8b, and 8c from a computer 9 at the start of operation, and the central value and the widths of upper and lower deviations are imparted. Whether the measured value is within the range or not is checked, and acceptance or rejection is judged. Then, the computers 8a, 8b, and 8c send the measured value and the result of the judgement to the computer 9. When the result is good, the computer 9 records the measured data, the serial number, and the name of the machine on a floppy disk. When the result is unsatisfactory, the rejected item, the serial number, and the name of the machine are typed out on printer 10. When the rejected item is a sound pressure or the frequency characteristic of impedance, the characteristic is plotted by a plotter 11. The worker can find the contents of rejection by observing the output of the printer 10 or the plotter 11. Therefore, time required for repair of the product becomes short.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a speaker system inspection device that inspects whether a speaker system satisfies predetermined performance and makes a pass/fail judgment in a speaker system mass production process. It is related to.

C. Configuration of conventional example and its problems) A conventional example is shown in FIG. In FIG. 1, ] is a simple anechoic chamber installed in a loudspeaker mass production line, 2 is a conveyor, and the test speaker is conveyed by conveyor 2 to 9 into the anechoic chamber 1. 3 is the test speaker under test, 4a, 4
b, 4c, and 4d are a group of speakers on the conveyor 2 outside the anechoic chamber 1, waiting for their turn to be inspected; 5 is the anechoic chamber]
The microphone 6 installed inside is a sine wave sweep oscillator, and also includes a power amplifier that supplies a sine wave to the test speaker 3 and an amplifier that amplifies the sound pressure signal detected by the microphone 5. A display device 7 displays the signal from the microphone 5 amplified by the amplifier of the sweep oscillator 6, that is, the sound pressure frequency characteristic of the test speaker 3. At the same time, the frequency characteristics of the impedance of the test speaker 3 are also displayed. The operator visually determines whether or not the above-mentioned characteristics displayed on the display device 7 are within the standard range, and determines whether the test speaker 3 is acceptable or not. In this case, the sweep oscillator 6 is used to determine both sound pressure and impedance.
is swept twice. As the number of production lines increases, more inspectors are needed, and there are also individual differences in the accuracy of judgment.

(Purpose of the Invention) The present invention provides a speaker system testing device that performs all testing of speaker characteristics on a production line using a computer, eliminates individual differences in testing performed by conventional workers, and speeds up the testing. It is something to do. Hereinafter, embodiments will be described in detail with reference to the drawings.

(Description of Embodiment) FIG. 2 shows an embodiment of the present invention. l a , 1 b
.

1c is a simple anechoic chamber installed in the production line, 2a
, 2b, 2c are conveyors of each line, 3a+3b,
3c is a test speaker; 4A, 4B, and 4C are a group of speakers waiting for their turn to be tested; and 5a, 5b.

5C is a microphone. The numbers 1 to 50 above correspond to the numbers 1 to 5 in FIG. ga, 8b.

Reference numeral 8c is a computer installed for each line. A pass/fail judgment is made on the speakers. Also, the speakers that have been tested are taken out of the anechoic chambers 1a, lb, and lc, and the standby speaker group 4
A, 48.4 It also outputs a signal to put the first speaker in C inside. 9 is a line installed computer 8a,
A host computer working in cooperation with sb and 8c provides pass/fail judgment criteria data to computers 8a, 8b and 8c. In addition, computers 8a, 8b, 8c
It plays the role of receiving measured data and storing it on a floppy disk, etc. Reference numeral 10 denotes a printer whose main role is to record the main part of the data sent from the computer 9 to the computers 8a, 8b, 8c, and to record the contents when a defective product is detected. A plotter 11 outputs the frequency characteristics of sound pressure and impedance when a defective product is detected. Reference numeral 12 is a monitor television that displays the production volume, defective rate, etc. of each model from time to time. Printer 10. Plotter 1
1. The monitor television 12 is connected to the computer 9 and operates according to instructions from the computer 9.

Next, an example of actual operation of the system shown in FIG. 2 will be explained.

The items that the line installation computers 8a, 8b, and 8c measure and inspect for the test speakers 3a, 3b, and 3c are: (a) lowest resonant frequency Ifo;

(b) Impedance at foK, Z.

(c) Speaker efficiency (d) Sound pressure frequency characteristic deviation (20Hz~20kHz
z ) (e) Impedance deviation (20Hz ~ 2
0 kHz) (f) 6 terms of polarity (phase at 200 Hz). For each of the above items, for example, the value of 2° is measured and checked to see if it is within the specified range. For sound pressure and impedance, frequencies between 20 Hz and 20 kHz are scaled by 25 on a logarithmic scale.
Divide it into 0 equal parts and judge whether each point is within the specified range. The more frequency points to be measured, the more accurate the judgment can be expected, but it is preferable to have too many frequency points because it will lengthen the measurement time, increase the memory of the computers 8a, 8b, and 8c, and increase the time for checking pass/fail. do not have.

A score of around 200 is appropriate.

The standard values (a) to (f) above are sent from the computer 9 to the computers 8a, 8b, and 8c at the start of work.

For example f. In this case, the center value f of j′o. The upper deviation width +Δfo'·f and the lower deviation width -Δf11 are given, respectively. Therefore f. If it is between (fo - Δfol) Kara (fo + Δfo''), it will be passed, and if it is outside the range, it will be rejected. For other than fo, the difference width between the center and the upper and lower sides is given in the same way, A check is made to see if the measured value is within the range, and a pass/fail judgment is made.

Next, the computers 8a, 8b, 8c perform the above (a) to
The measured value in (f) and the result of the pass/fail judgment are sent to the conbeater 9. If it passes, the computer 9 records the measured data serial number and model name on a floppy disk. In the case of a failure, the item of failure and the serial number and model name are printed out in the printer IOK type, and if the failure item is a frequency characteristic of sound pressure or impedance, the characteristic is plotted out in block 11. . Since the operator can know the details of the failure by looking at the output 1 of the printer 10 or the block 11, the time spent repairing the product can be shortened. Further, each time the computer 9 receives measurement data from the computers 8a, 8b, and 8c installed on each line, it displays on the monitor television 12 the total number of units produced by model, defective rate, etc. on that day. By looking at the monitor television 12, the line supervisor can immediately know the current production status and defect occurrence status.

The models that will be run on each line that day are separated first thing in the morning.

Since the criteria for all models are stored on one floppy disk, only the criteria for the models to be produced on that day are loaded into the memory of the computer 9 first thing in the morning.

Next, the computer 9 transfers the judgment criteria to the computer 8a installed in each line according to the model used in each line.

Send 8b, 8cK. Even if two or more models are run on one line in a day, all the judgment criteria required for that day are stored in the memory of the computer 9, so when changing models on the line, the judgment criteria for the next model can be transferred from the line converter 9 to the next model. The only operation required is to send the data to the converters 8a, 8b, and 8c. Therefore, the time required for model switching is shortened. If this operation takes too long, measurement data from other lines cannot be sent to the conbeater 9, and products waiting to be inspected will accumulate, causing inconvenience. This inconvenience can be solved by making the computer 9 a computer capable of high-speed processing and transferring the data from the computers 8a, 8b, and 8c installed on each line by DMA, but the price of the computer 9 has increased and the program It has a number of complex drawbacks.

- When the day's production is finished, the computer 8a.

All measurement data transferred from 8b and 8c to the computer 9 is classified by model, and aggregation processing such as the number of non-defective units produced, defect rate, and classification of defect content is performed. This process is carried out by the converter 9 according to a preset program.

The results are printed on the printer 10, so that the manager can see the entire production situation for that day.

In addition, each of the line installed computers 8a, 8b, and 8c is equipped with a switch, and when this switch is turned on, measurement data and pass/fail judgment results are not sent to the computer 9, and measurements and judgments are performed one after another. Only the defects are notified to the operator. So~
The notification method is to print the information on small printers connected individually to the computers 8a, 8b, and 8c.

Because it has such a function, even if the computer 9 should break down, production can continue without stopping the entire line.

(Effects of the Invention) (1) Since 6 items are judged at once in - frequency sweeps, the measurement time is short and the speed is 25 times faster than the conventional manual method.

(2) Conventionally, three inspectors were required for one production and 600 units, but with the present invention, no workers are required after the operation of the combiner 9 is required at the start and end of the work day. Unfortunately, there will be a significant reduction in personnel.

(3) Inspection accuracy, which previously relied on visual inspection and operator experience, has now been improved to 10, '2d.
It is possible to keep it within B.

(4) Conventionally, III data has been recorded on paper, but by recording on floppy disks, the recording cost per device can be significantly reduced from 7 yen to 2 yen. When investigating variations in a particular model, data can be retrieved from a floppy disk and processed by a computer, which is extremely useful for quality control.

(5) Even if the number of production units increases, it has sufficient flexibility to cope with the increase by increasing the number of computers installed on the line and increasing the capacity of the host computer.

Based on the effects (1) to (5) above, the present invention not only automates the inspection of speaker systems in the production line, but also significantly improves inspection time, accuracy, cost, data utilization, etc. It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a conventional example, and FIG. 2 is a diagram showing the configuration of an embodiment of the present invention. 1a, 1b, 1c...Simple anechoic chamber, 2a, 2b, 2c
= Conveyor, 3a, 3b, 3c... Test speaker, 4A, 4B, 4C... Speaker group waiting for inspection turn, 5alsb, 5c - Microphone, 8a, 8b,
8c line installation computer, 9 host computer 10 printer,] 1 plotter 1
2...Monitor TV. Figure 1 Figure 2 0

Claims (1)

[Scope of Claims] A speaker system testing device characterized by comprising the following components: (1) a simple anechoic chamber installed in each speaker system manufacturing line; (11) said manufacturing line; A swept sine wave is supplied to the test speaker installed in each line and carried into the simple anechoic chamber, and the electrical signal obtained by receiving the sound emitted from the test speaker with a microphone is input and analyzed. a line-installed computer that determines whether the characteristics of the test speaker are within the standards, and transmits the measurement data and judgment results to the host converter (11p). (IV) a host computer that stores the measurement data and judgment results sent from the computer installed on the line, outputs the details of the defect to the peripheral equipment in the case of failure, and sends the production status to the display every moment; A display, a printer, and a plotter that output the information sent from the host computer.