CN212007087U - Diaphragm thickness detection device - Google Patents
Diaphragm thickness detection device Download PDFInfo
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- CN212007087U CN212007087U CN202020622947.7U CN202020622947U CN212007087U CN 212007087 U CN212007087 U CN 212007087U CN 202020622947 U CN202020622947 U CN 202020622947U CN 212007087 U CN212007087 U CN 212007087U
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Abstract
The embodiment of the utility model discloses diaphragm thickness detection device is applied to electron technical field, and this diaphragm thickness detection device includes: light emitting device, light receiving device, illumination display instrument and cassette. Light emitting device is connected with the output of illumination display instrument, light receiving arrangement is connected with the input of illumination display instrument, light emitting device and light receiving arrangement place in the opaque magazine, place between light emitting device and the light receiving arrangement and wait to detect the diaphragm, illumination display instrument arouses light emitting device emission light signal, the light signal of transmission is input the illumination display instrument after waiting to detect the diaphragm and being received and convert the signal of telecommunication into by light receiving arrangement, according to the intensity of the signal of telecommunication, the thickness of waiting to detect the diaphragm is detected in drive illumination display instrument's detection indicator demonstration, the thickness of waiting to detect the diaphragm is linear inverse ratio with the intensity of the signal of telecommunication, can realize treating the accurate measurement of non-contact of detecting diaphragm thickness.
Description
Technical Field
The utility model belongs to the technical field of the electron, especially, relate to a diaphragm thickness detection device.
Background
In condenser microphones, the diaphragm is a critical component. The diaphragm is composed of a polymer diaphragm of a base layer and a metal coating evaporated on the surface of the diaphragm, and the consistency of the thickness of the coating determines the sensitivity consistency, high temperature resistance parameters, frequency response and tone quality of the microphone.
So far, the consistency of the coating thickness of the diaphragm is usually detected by a thickness gauge, but because the material of the diaphragm is soft and the coating is fragile, an accurate result is difficult to obtain during testing, the diaphragm exceeding the standard thickness cannot be effectively removed, and the consistency of the sensitivity of the microphone cannot be ensured.
SUMMERY OF THE UTILITY MODEL
The utility model provides a diaphragm thickness detection device aims at solving because the material of diaphragm is soft, cladding material is fragile, and causes to be difficult to the accurate measurement and plates the diaphragm thickness of cladding material to can't ensure the problem of microphone sensitivity uniformity.
The embodiment of the utility model provides a diaphragm thickness detection device, include:
the device comprises a light emitting device, a light receiving device, an illumination display instrument and a cassette;
the light emitting device is connected with the output end of the illumination display instrument, the light receiving device is connected with the input end of the illumination display instrument, and the light emitting device and the light receiving device are placed in the light-tight cassette;
a to-be-detected membrane with a coating on the surface is placed between the light emitting device and the light receiving device, the illumination display instrument outputs voltage to the light emitting device, the light emitting device emits light signals, the emitted light signals are received by the light receiving device through the to-be-detected membrane, and the light receiving device converts the received light signals into electric signals to be input to the illumination display instrument;
the illumination display instrument comprises a detection indicator for displaying the thickness of the membrane to be detected, the illumination measurement instrument drives the detection indicator to display the thickness of the membrane to be detected according to the intensity of the electric signal, and the thickness of the membrane to be detected is in linear inverse proportion to the intensity of the electric signal.
Further, the cassette is a detachable cassette, and the detachable cassette comprises a first cassette and a second cassette which are detachable from top to bottom; the first cassette has the light emitting device placed therein, and the second cassette has the light receiving device placed therein.
Further, the light emitting device includes a light emitting diode; the light receiving device includes a light receiving chip.
Further, the light emitting device further comprises a current limiting resistor; one end of the current-limiting resistor is connected with the light-emitting diode, and the other end of the current-limiting resistor is grounded.
Further, the illumination display instrument further comprises a calibration device, the calibration device is connected with the detection indicator, and before the membrane to be detected is not placed between the light emitting device and the light receiving device, the indicated value of the detection indicator is adjusted to point to the maximum scale value.
Further, the calibration device comprises an adjustable resistor; one end of the adjustable resistor is connected with the light receiving chip, and the other end of the adjustable resistor is connected with the detection indicator.
Further, the detection indicator is a pointer type indicator, and the outer surface of an indicating window of the detection indicator is engraved with a diaphragm thickness value corresponding to the strength of the electric signal.
Further, the detection indicator is an ammeter.
Further, the SRC end of the light receiving chip is connected with an alarm control circuit, and when the thickness of the membrane to be detected exceeds a preset range, the SRC end outputs an alarm control signal.
Furthermore, the alarm control circuit is externally connected with an alarm which is a sound alarm and/or an optical alarm.
It can be known from the above embodiments of the present invention that, the light emitting device and the light receiving device are placed in the cassette, and the film to be detected with the thickness of the coating to be detected is placed between the light emitting device and the light receiving device, the illumination display instrument excites the light emitting device to emit a light signal, the light signal is received by the light receiving device after passing through the film to be detected, and is converted into an electrical signal by the light receiving device, the detection indicator in the illumination display instrument is driven to display the thickness of the film to be detected, through such a test, the non-contact accurate measurement of the thickness of the film with the coating is realized, the thickness of the coating of the film can be judged according to the intensity of the light current value of the film to be detected, the microphone is not affected by the material of the film and the fragility of the coating, on the basis of accurately measuring the thickness of the film, the film exceeding, the consistency of hardware index specifications of the microphone is realized, and the yield of the microphone is greatly improved.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is a schematic structural diagram of a film thickness detection apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a film thickness detection device according to another embodiment of the present invention;
fig. 3 is a partial circuit diagram of a film thickness detection apparatus provided in an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a light receiving device in a film thickness detection device according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a film thickness detection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a film thickness detection device provided in an embodiment of the present invention, which is used for measuring the thickness of a film, especially a film plated layer of a condenser microphone. The principle that the thickness of the coating of the diaphragm is in inverse proportion to the transmittance is adopted, and the thickness of the diaphragm is tested by utilizing the principle that the thickness of the diaphragm is different and the transmittance is also different, so that the thickness of the coating of the diaphragm is tested in a non-contact manner. This diaphragm thickness detection device mainly includes:
the light emitting device 10, the light receiving device 20, the illumination display 30, and the cassette 40;
the light emitting device 10 is connected to an output terminal 31 of the illumination display 30, the output terminal 31 is a power outlet, and the power supply may be a 3V battery. The output terminal 31 may output a voltage to the light emitting device 10. The light receiving device 20 is connected to an input end 32 of the illumination display 30, where the input end 32 is specifically an electrical signal input end, and the input end 32 can receive an electrical signal input by the light receiving device 20.
The light emitting device 10 and the light receiving device 20 are placed in a light-tight cassette 40.
The light emitting device 10 and the light receiving device 20 are not in contact with each other, a film 50 to be detected with a coating on the surface is placed between the light emitting device 10 and the light receiving device 20, the illumination display instrument 30 outputs direct-current voltage to the light emitting device 10, the light emitting device 10 emits light signals, the emitted light signals are received by the light receiving device 20 through the film 50 to be detected, and the light receiving device 20 converts the received light signals into electric signals to be input into the illumination display instrument 30. The illumination display instrument 30 comprises a detection indicator 33 for displaying the thickness of the membrane 50 to be detected, the electric signal drives the detection indicator 33 to display the thickness of the membrane to be detected, the displayed thickness is related to the intensity of the electric signal, the thickness of the membrane 50 to be detected is in linear inverse proportion to the intensity of the electric signal, namely, the larger the thickness is, the weaker the transmitted light is, the weaker the intensity of the electric signal is, and the larger the thickness of the membrane to be detected is displayed by the detection indicator 33; the smaller the thickness, the stronger the transmitted light, the stronger the intensity of the electrical signal, and the smaller the thickness of the membrane to be detected displayed by the detection indicator 33.
Specifically, the detection indicator 33 is a pointer type indicator, a diaphragm thickness value corresponding to the electric signal strength is engraved on the outer surface of an indication window of the detection indicator 33, the diaphragm thickness value is a corresponding relation obtained in advance according to an experimental result of the electric signal strength and the diaphragm thickness value, a maximum value of the diaphragm thickness and a maximum value of a corresponding current value are engraved, when the diaphragm thickness exceeds the maximum value, the current value also exceeds the maximum value, which indicates that the diaphragm thickness exceeds a specification, and the diaphragm plating layer is not qualified. The detection indicator 33 is in particular an ammeter with a specification of 100 microamperes. Through the test, the current deflection value of the ammeter is marked as the membrane thickness value, so that the membrane thickness value corresponding to the current value transmitted to the illumination display instrument 30 by the light receiving device 20 can be indicated by using the pointer of the ammeter.
Further, the illumination display apparatus 30 further includes a calibration device connected to the detection indicator 33, and the indication value of the detection indicator 33 is adjusted to point to the maximum scale value, i.e., the full scale value before the film 50 to be detected is placed between the light emitting device 10 and the light receiving device 20. The calibration device is provided with a calibration button 34 on the surface of the illumination detector 30, and the user can calibrate the initial indication value of the detection indicator 33 by operating the calibration button 34. Because the changes such as voltage change, temperature variation of this diaphragm thickness detection device all can cause parameter drift, influences the detection precision to diaphragm thickness, so before detecting at every turn, under the condition that has not placed and wait to detect diaphragm 50, adjust this calibrating device earlier, can improve the precision that detects.
In the embodiment, the light emitting device and the light receiving device are placed in the cassette, the film to be detected with the thickness of the coating to be detected is placed between the light emitting device and the light receiving device, the illumination display instrument excites the light emitting device to emit a light signal, the light signal penetrates through the film to be detected, is received by the light receiving device and is converted into an electric signal by the light receiving device, the detection indicator in the illumination display instrument is driven to display the thickness of the film to be detected, through the test, the non-contact accurate measurement of the thickness of the film with the coating is realized, the thickness of the coating of the film can be judged according to the intensity of the light current value penetrating through the film to be detected, the influence of the material and the fragility of the coating of the film is avoided, on the basis of accurately measuring the thickness of the film, the film exceeding the standard thickness can be effectively eliminated, the sensitivity consistency of the microphone is ensured, thereby greatly improving the yield of the microphone.
Further, referring to fig. 2, fig. 2 is a schematic structural diagram of a film thickness detecting apparatus provided in an embodiment of the present invention, the film cartridge 40 is a detachable film cartridge, the detachable film cartridge 40 includes a first film cartridge 41 and a second film cartridge 42, the first film cartridge 41 is disposed above the light emitting device 10, and the second film cartridge 42 is disposed below the light receiving device 20. The film to be detected can be conveniently put into or taken out of the light emitting device 10 and the light receiving device 20, and the convenience of operation is improved.
Further, referring to fig. 3 to 5, fig. 3 is a partial circuit diagram of a light emitting device and a light receiving device in a film thickness detection device, fig. 4 is a schematic circuit diagram of a light receiving device in a film thickness detection device, and fig. 5 is a circuit diagram of a film thickness detection device according to an embodiment of the present invention. The light emitting device 10 includes a light emitting diode D1, a current limiting resistor R1 and an adjustable resistor R2, one end of the current limiting resistor R1 is connected to the light emitting diode D1, the other end is grounded, and the current limiting resistor R1 is used for preventing the light emitting diode D1 from being damaged when the voltage is too high. The Light Emitting Diode D1 may be more specifically an LED (Light Emitting Diode) Emitting tube capable of Emitting white Light, and the power line of the Light Emitting Diode D1 is connected to the power outlet 31.
The light receiving device 20 includes a light receiving chip, specifically, a visible light intensity sensor LX1970, which can sensitively capture and analyze a weak light change and convert the light change into an electrical signal. One end of the adjustable resistor R2 is connected to LX1970, and the other end is connected to the detection indicator 33. The indicated value of the detection indicator 33 can be changed by adjusting the size of the adjustable resistor R2, so that the purposes of calibrating test errors and precision are achieved.
A membrane to be detected is placed between the light emitting diodes D1 and the LX1970, the thickness of the membrane to be detected is different, the light transmittance of the membrane to be detected is different, the different light transmittance of the membrane to be detected enables the illuminance of light emitted by the light emitting diodes D1 to be changed, further the current is changed, and the changed current has the corresponding changed thickness. I.e. different membrane thicknesses correspond to different currents. The principle that the coating thickness of the diaphragm is in inverse proportion to the transmittance is adopted, the darkroom box is added by the high-precision optical sensor, the thickness of the diaphragm is tested by utilizing the principle that the different luminosities of the diaphragm are different, the thickness of the coating of the diaphragm is tested in a non-contact manner, the test result is more accurate, the problem of inaccurate measurement of the thickness of the diaphragm is effectively solved, the diaphragm exceeding the standard thickness can be effectively removed, and the consistency of the microphone is ensured.
Further, the light receiving device 20 is specifically a light receiving chip, a control output end of an SRC end of the light receiving chip is connected to the alarm control circuit 60, the alarm control circuit 60 is externally connected to an alarm, the alarm is a sound alarm and/or a light alarm, when the thickness of the film to be detected exceeds a preset range, a value outside the preset range is an unqualified thickness value, the SRC end outputs an alarm control signal, and the alarm control circuit 60 drives the alarm to give an alarm to remind a user of paying attention, so that the intelligence of detection result prompt is improved.
Further, the SRC end of the light receiving chip is connected to a resistor R3, a resistor R4, and a capacitor C, which have a capacitance of 10 μ farads, to form the light receiving device 20. The resistor R3 and the resistor R4 form a voltage dividing circuit to provide a bias voltage for the SRC control end of the chip LX1970, meanwhile, the resistor R4 is also a load resistor of the control end of the chip LX1970, and the resistor R4 is combined with the capacitor C to establish a stable output control voltage to trigger the alarm.
With further reference to fig. 5, the circuit of the membrane thickness detection device further includes a push button switch for triggering the detection of the current membrane thickness, and a power switch for turning on and off the power supply of the battery pair D1.
The power consumption of the diaphragm thickness detection device in the embodiment is only 0.2mA, so that the power cost is greatly saved.
The utility model provides a diaphragm thickness detection device's theory of operation as follows: the light receiving device 20 and the light emitting device 10 are placed in the cassette, the film 50 to be detected is placed between the light receiving device 20 and the light emitting device 10, the direct current voltage output by the output terminal 31 of the illumination display 30 is supplied to the light emitting diode D1 in the light receiving device 20, the light emitted by the light emitting diode D1 is transmitted through the film 50 to be detected, the light receiving chip LX1970 in the light receiving device 20 receives the light signal, converts the light signal into an electric signal, and transmits the electric signal to the input terminal 32 of the illumination display 30 through an output line to drive the pointer of the detection indicator 33 to deflect, and the value of the film thickness is indicated.
In the embodiment, the light emitting device and the light receiving device are placed in the cassette, the film to be detected with the thickness of the coating to be detected is placed between the light emitting device and the light receiving device, the illumination display instrument excites the light emitting device to emit a light signal, the light signal penetrates through the film to be detected, is received by the light receiving device and is converted into an electric signal by the light receiving device, the detection indicator in the illumination display instrument is driven to display the thickness of the film to be detected, through the test, the non-contact accurate measurement of the thickness of the film with the coating is realized, the thickness of the coating of the film can be judged according to the intensity of the light current value penetrating through the film to be detected, the influence of the material and the fragility of the coating of the film is avoided, on the basis of accurately measuring the thickness of the film, the film exceeding the standard thickness can be effectively eliminated, the sensitivity consistency of the microphone is ensured, thereby greatly improving the yield of the microphone.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above is right the utility model provides a diaphragm thickness detection device's description, to the technical personnel in this field, according to the utility model discloses the thought of embodiment all has the change part on concrete implementation and application scope, to sum up, this description content should not be understood as right the utility model discloses a restriction.
Claims (10)
1. A film thickness detection device, comprising:
the device comprises a light emitting device, a light receiving device, an illumination display instrument and a cassette;
the light emitting device is connected with the output end of the illumination display instrument, the light receiving device is connected with the input end of the illumination display instrument, and the light emitting device and the light receiving device are placed in the light-tight cassette;
a to-be-detected membrane with a coating on the surface is placed between the light emitting device and the light receiving device, the illumination display instrument outputs voltage to the light emitting device, the light emitting device emits light signals, the emitted light signals are received by the light receiving device through the to-be-detected membrane, and the light receiving device converts the received light signals into electric signals to be input to the illumination display instrument;
the illumination display instrument comprises a detection indicator for displaying the thickness of the membrane to be detected, the illumination display instrument drives the detection indicator to display the thickness of the membrane to be detected according to the intensity of the electric signal, and the thickness of the membrane to be detected is in linear inverse proportion to the intensity of the electric signal.
2. The film thickness detecting apparatus according to claim 1, wherein the cassette is a detachable cassette including a first cassette and a second cassette which are detachable from each other;
the first cassette has the light emitting device placed therein, and the second cassette has the light receiving device placed therein.
3. The film thickness detection apparatus according to claim 1 or 2, wherein the light emitting means includes a light emitting diode; the light receiving device includes a light receiving chip.
4. The film thickness detecting device according to claim 3, wherein the light emitting device further comprises a current limiting resistor;
one end of the current-limiting resistor is connected with the light-emitting diode, and the other end of the current-limiting resistor is grounded.
5. The film thickness detecting apparatus according to claim 4, wherein the illumination display device further comprises a calibration device, the calibration device is connected to the detection indicator, and the indication value of the detection indicator is adjusted to point to the maximum scale value before the film to be detected is placed between the light emitting device and the light receiving device.
6. The film thickness detection device of claim 5, wherein the calibration device comprises an adjustable resistor;
one end of the adjustable resistor is connected with the light receiving chip, and the other end of the adjustable resistor is connected with the detection indicator.
7. The film thickness detection device according to claim 6, wherein the detection indicator is a pointer indicator, and an outer surface of an indication window of the detection indicator is engraved with a film thickness value corresponding to the intensity of the electric signal.
8. The film thickness detection device of claim 7, wherein the detection indicator is an ammeter.
9. The apparatus according to claim 8, wherein an SRC end of the light receiving chip is connected to an alarm control circuit, and when the thickness of the film to be detected exceeds a preset range, the SRC end outputs an alarm control signal.
10. The film thickness detection device according to claim 9, wherein the alarm control circuit is externally connected with an alarm, and the alarm is an acoustic alarm and/or an optical alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020622947.7U CN212007087U (en) | 2020-04-22 | 2020-04-22 | Diaphragm thickness detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020622947.7U CN212007087U (en) | 2020-04-22 | 2020-04-22 | Diaphragm thickness detection device |
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| CN212007087U true CN212007087U (en) | 2020-11-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804116A (en) * | 2021-09-10 | 2021-12-17 | 湖南捷力泰科技有限公司 | Optical testing method and system for membrane thickness |
| CN113959349A (en) * | 2021-10-25 | 2022-01-21 | 湖南捷力泰科技有限公司 | Membrane quality detection device and method |
| CN113992284A (en) * | 2021-10-28 | 2022-01-28 | 中国人民解放军32181部队 | Portable signal strength detection device |
-
2020
- 2020-04-22 CN CN202020622947.7U patent/CN212007087U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804116A (en) * | 2021-09-10 | 2021-12-17 | 湖南捷力泰科技有限公司 | Optical testing method and system for membrane thickness |
| CN113804116B (en) * | 2021-09-10 | 2022-06-10 | 湖南捷力泰科技有限公司 | Optical testing method and system for membrane thickness |
| CN113959349A (en) * | 2021-10-25 | 2022-01-21 | 湖南捷力泰科技有限公司 | Membrane quality detection device and method |
| CN113992284A (en) * | 2021-10-28 | 2022-01-28 | 中国人民解放军32181部队 | Portable signal strength detection device |
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