Patent Application
20220187170
The present invention relates to a technology of inspecting a tactile device for generating a traction illusion by vibrations to check the quality of the tactile device.
Heretofore, as a pseudo force sense generation device for generating pseudo force sense to a person by using asymmetrical vibrations generated by an actuator, what is called a tactile device has been developed (refer to, for example, Patent Literature 1). This kind of tactile device uses an illusion of a person. The tactile device can generate a traction illusion by which the person feels as if a hand of the person is pulled in a particular direction, even though the hand is not physically pulled.
Patent Literature 1: Domestic Re-publication of PCT International Publication for Patent Application No. 2017-115729
The tactile device is an electronic device including multiple actuators. When the tactile device is mass-produced as a product and shipped out, it is necessary to carry out an inspection before shipping to check the quality of operation of each manufactured item. In a usual inspection of electronic device before shipping, the electronic device targeted for inspection is operated so that signals from individual parts are detected; in accordance with the objective data indicated by the detected signals, the quality of the target electronic device is checked.
However, the traction illusion that a tactile device operates to generate is a subjective sensation perceived by a person. Hence, it is difficult to detect the traction illusion generated by the tactile device targeted for inspection as objective data to check the quality of the tactile device. In response to this, one conceivable method is a manual inspection method in which a person checks the quality of the traction illusion generated by each tactile device.
However, such an inspection method has a problem in which it is difficult to maintain a consistent level of quality of manufactured items to be shipped out because the evaluation relies on personal views. Furthermore, since the inspection of individual manufactured items needs to be manually carried out, a certain length of time is necessary for accurate manual evaluation. Moreover, many people need to work when the product is mass-produced and efficiently shipped out. As a result, inspection methods in which people perform the evaluation have a problem in which the total cost for inspection significantly increases due to the increase in the time for the inspection before shipping and the increase in labor costs.
Embodiments of the present invention have been made to address such problems, and an object thereof is to provide a tactile device inspection technology for objectively checking the quality of a tactile device.
To achieve this object, a tactile device inspection system according to embodiments of the present invention is configured to determine the quality of tactile devices each configured to generate a traction illusion by vibrations. The tactile device inspection system includes: a test apparatus configured to obtain a test result indicating a subjective evaluation of a subject with respect to a traction illusion generated by a sample of the tactile devices prepared beforehand; a quality check apparatus configured to check quality of the sample in accordance with the test result; a measurement apparatus configured to perform measurement processing to obtain objective sample characteristic data representing the traction illusion generated by the sample; a feature computation apparatus configured to compute a reference feature to be used to determine quality of an inspection target of the tactile devices targeted for inspection in accordance with a quality check result indicating the quality of the sample and the sample characteristic data of the sample; an inspection apparatus configured to perform measurement processing to obtain objective inspection target characteristic data representing a traction illusion generated by the inspection target; and a determination apparatus configured, for each inspection target, to compute an inspection target feature indicating a feature of the traction illusion generated by the inspection target in accordance with the obtained inspection target characteristic data, and determine quality of the inspection target in accordance with a comparison result of the inspection target feature to the reference feature.
In one configuration example of the tactile device inspection system according to embodiments of the present invention, the quality check apparatus is configured, for each sample, to compute a correct answer rate in accordance with the subjective evaluation included in the test result, and check the quality of the sample in accordance with a comparison result of the correct answer rate of the sample to a threshold determined by using a distribution of the correct answer rates of the respective samples.
In one configuration example of the tactile device inspection system according to embodiments of the present invention, the subjective evaluation is based on a two-alternative forced choice task.
In one configuration example of the tactile device inspection system according to embodiments of the present invention, the feature computation apparatus is configured to compute reference data representing non-defective samples of the samples, the non-defective samples being determined as non-defective items in the quality check result, by statistically processing the sample characteristic data of the non-defective samples, compute match rates between the sample characteristic data of the respective samples and the reference data as sample features of the samples, and compute the reference feature in accordance with the sample features of the non-defective samples and the sample features of defective samples determined as defective items in the quality check result.
In one configuration example of the tactile device inspection system according to embodiments of the present invention, the sample characteristic data and the inspection target characteristic data relate to speed, acceleration rate, position, or force of the tactile device, or any combination of speed, acceleration rate, position, and force of the tactile device.
In one configuration example of the tactile device inspection system according to embodiments of the present invention, the sample characteristic data and the inspection target characteristic data relate to time response with respect to speed, acceleration rate, position, or force of the tactile device, or any combination of speed, acceleration rate, position, and force of the tactile device.
In one configuration example of the tactile device inspection system according to embodiments of the present invention, the sample characteristic data and the inspection target characteristic data relate to frequency response with respect to speed, position, or force of the tactile device, or any combination of speed, position, and force of the tactile device.
A tactile device inspection apparatus according to embodiments of the present invention includes an arithmetic processing circuit for determining the quality of tactile devices each configured to generate a traction illusion by vibrations. The arithmetic processing circuit includes: a data acquisition unit configured to obtain, from a sample of the tactile devices prepared beforehand, a test result indicating a subjective evaluation of a subject with respect to a traction illusion generated by the sample and objective sample characteristic data representing the traction illusion, and obtain, from an inspection target of the tactile devices targeted for inspection, objective inspection target characteristic data representing a traction illusion generated by the inspection target; a quality check unit configured to check quality of the sample in accordance with the test result; a feature computation unit configured to compute a reference feature to be used to determine quality of the inspection target in accordance with a quality check result indicating the quality of the sample and the sample characteristic data of the sample; and a determination processing unit configured, for each inspection target, to compute an inspection target feature indicating a feature of the traction illusion generated by the inspection target in accordance with the inspection target characteristic data obtained from the inspection target, and determine quality of the inspection target in accordance with a comparison result of the inspection target feature to the reference feature.
A tactile device inspection method according to embodiments of the present invention is used when a computer system determines the quality of tactile devices each configured to generate a traction illusion by vibrations. The tactile device inspection method includes: a test step in which the computer system obtains a test result indicating a subjective evaluation of a subject with respect to a traction illusion generated by a sample of the tactile devices prepared beforehand; a quality check step in which the computer system checks quality of the sample in accordance with the test result; a measurement step in which the computer system performs measurement processing to obtain objective sample characteristic data representing the traction illusion generated by the sample; a feature computation step in which the computer system computes a reference feature to be used to determine quality of an inspection target of the tactile devices targeted for inspection in accordance with a quality check result indicating the quality of the sample and the sample characteristic data of the sample; an inspection step in which the computer system performs measurement processing to obtain objective inspection target characteristic data representing a traction illusion generated by the inspection target; and a determination step in which the computer system computes, for each inspection target, an inspection target feature indicating a feature of the traction illusion generated by the inspection target in accordance with the obtained inspection target characteristic data, and determines quality of the inspection target in accordance with a comparison result of the inspection target feature to the reference feature.
Another tactile device inspection method according to embodiments of the present invention is used when an arithmetic processing circuit determines the quality of tactile devices each configured to generate a traction illusion by vibrations. The tactile device inspection method includes: a data acquisition step in which the arithmetic processing circuit obtains, from a sample of the tactile devices prepared beforehand, a test result indicating a subjective evaluation of a subject with respect to a traction illusion generated by the sample and objective sample characteristic data representing the traction illusion, and obtains, from an inspection target of the tactile devices targeted for inspection, objective inspection target characteristic data representing a traction illusion generated by the inspection target; a quality check step in which the arithmetic processing circuit checks quality of the sample in accordance with the test result; a feature computation step in which the arithmetic processing circuit computes a reference feature to be used to determine quality of the inspection target, in accordance with a quality check result indicating the quality of the sample and the sample characteristic data of the sample; and a determination processing step in which the arithmetic processing circuit computes, for each inspection target, an inspection target feature indicating a feature of the traction illusion generated by the inspection target in accordance with the inspection target characteristic data obtained from the inspection target, and determines quality of the inspection target in accordance with a comparison result of the inspection target feature to the reference feature.
With embodiments of the present invention, by using the reference feature Qs previously computed, it is possible to objectively determine the quality of a manufactured item to be shipped out, that is, the inspection target of the tactile device without evaluation based on personal views, and as a result, it is possible to maintain a consistent level of quality of manufactured items to be shipped out. Although the evaluations based on personal views of test subjects are necessary to compute the reference feature, these evaluations are made by using only the prepared samples of the tactile device. For this reason, it is necessary only to perform measurement processing to obtain the inspection target characteristic data of the manufactured item to be shipped out, compute the inspection target feature, and compare the inspection target feature with the reference feature, and thus, it is possible to automatize the inspection before shipping and greatly improve the efficiency of the inspection.
Next, embodiments of the present invention will be described with reference to the drawings.
Firstly, a tactile device inspection system 1 according to a first embodiment of the present invention will be described with reference to
The tactile device inspection system 1 illustrated in
As illustrated in
Of these apparatuses, before the quality determination of the tactile device B is performed, the test apparatus 10A, the quality check apparatus 10B, the measurement apparatus 20A, and the feature computation apparatus 20B are used at, for example, a laboratory, to compute a reference feature to be used for the quality determination of the tactile device B. After the reference feature is computed, the inspection apparatus 30A and the determination apparatus 30B are used at an actual shipping inspection place to determine the quality of the tactile device B in accordance with the reference feature.
These six apparatuses may be each formed as a logic integrated circuit or a circuit component, or an arithmetic processing circuit implemented by a C reference feature U running a program. Alternatively, these six apparatuses may be implemented as a computer system composed of a server apparatus and an information processing apparatus such as a personal computer (PC) and connected by using communications lines.
The description of the present embodiment uses as an example the case in which these six apparatuses are implemented as discrete apparatuses, but this example should not be construed in a limiting manner. For example, in accordance with the time or place at which each apparatus is used, two or more, or all these apparatuses may be implemented as a single apparatus.
The tactile device B is a device for generating a traction illusion by vibrations; the tactile device B performs a functionality of generating a traction illusion by which a person feels as if a hand of the person is pulled in a particular direction by operating a plurality of actuators to asymmetrically vibrate, even though the hand is not physically pulled. One specific example of the tactile device B is, but not limited to, the pseudo force sense generation device of Patent Literature 1 described above. The embodiments of the present invention can inspect other kinds of tactile devices in a similar manner.
In the present embodiment, one tactile device B prepared to compute a reference feature used for the quality determination is referred to as a sample BS. Additionally, another tactile device B as a target for actual inspection is referred to as an inspection target BX.
Next, a configuration of the test apparatus 10A of the tactile device inspection system 1 according to the present embodiment will be described in detail with reference to
The test apparatus 10A includes a drive circuit 11, an operational input circuit 12, and a test control circuit 13 as main circuit units.
The drive circuit 11 performs a function of generating a traction illusion by operating the sample BS connected with or without a wire connection in accordance with an instruction from the test control circuit 13.
The operational input circuit 12 performs a function of detecting an answer operation Do of the test subject Y indicating a subjective evaluation result regarding a traction illusion. The subjective evaluation is made by the test subject Y in accordance with the perceived traction illusion generated by the sample BS.
The test control circuit 13 performs a function of instructing the drive circuit 11 to generate a traction illusion and a function of generating a test result D1 by collecting the answer operation Do detected by the operational input circuit 12.
Next, an evaluation test method implemented by the test apparatus 10A will be described.
In the evaluation test for the sample BS conducted by the test subject Y, the following steps 101 to 103 are repeatedly performed for individual samples BS by using different test subjects Y (step 100).
Firstly, the test apparatus 10A and a plurality of samples BS are prepared and one test subject Y is selected from a plurality of test subjects (step 101). The test method is explained to the test subject Y (step 102).
Next, the following steps 104 and 105 are repeatedly performed for each of the samples BS (step 103).
Firstly, the test subject Y is handed one selected sample BS, and the test subject Y wears earmuffs for sound insulation and a blindfold (step 104). Next, the following steps 106 and 107 are repeatedly performed while the strength and direction of the traction illusion generated by the sample BS are changed.
Firstly, without providing any information for the test subject Y beforehand, the sample BS is operated to generate a traction illusion of a particular strength in a particular direction that are randomly selected (step 106). The test subject Y inputs the answer operation Do indicating a subjective evaluation result of the traction illusion perceived by the test subject Y (step 107). At this time, it is assumed that what is called the two-alternative forced choice task is used, in which the traction illusion is generated in either one of two predetermined directions such as the left and right or front and rear directions, and the test subject Y answers one direction in which the test subject Y feels pulled. In both directions, a traction illusion is generated the same number of times.
In this manner, for each sample BS, it is possible to obtain an answer indicating subjective evaluation with regard to the traction illusion that the test subject Y perceived in different strengths in different directions. By obtaining the answers from each test subject, it is possible to obtain the test result D1 based on all the test subjects Y and all the samples BS.
Next, a configuration of the quality check apparatus 10B of the tactile device inspection system 1 according to the present embodiment will be described in detail with reference to
The quality check apparatus 10B includes a correct answer rate computation circuit 15 and a quality check circuit 16 as main circuit units.
The correct answer rate computation circuit 15 performs a function of computing a correct answer rate D2 for each sample BS in accordance with whether a particular traction illusion generated by the sample BS matches a subjective evaluation result of the particular traction illusion carried out by the test subject Y, that is, the answer operation Do, which are included in the test result D1 obtained by the test apparatus 10A.
The quality check circuit 16 performs a function of determining a threshold for quality determination by statistically processing the correct answer rates D2 of the respective samples BS computed by the correct answer rate computation circuit 15. The quality check circuit 16 also performs a function of generating a quality check result D3 with respect to each sample BS by processing the correct answer rate D2 of the sample BS in accordance with the determined threshold and accordingly checking the quality of the sample BS.
Next, a configuration of the measurement apparatus 20A of the tactile device inspection system 1 according to the present embodiment will be described in detail with reference to
The measurement apparatus 20A includes a drive circuit 21, a measurement circuit 22, and a measurement control circuit 23 as main circuit units.
The drive circuit 21 performs a function of generating a traction illusion by operating the connected sample BS in accordance with an instruction from the measurement control circuit 23.
The measurement circuit 22 performs a function of performing measurement processing to obtain the objective sample characteristic data D5 representing the operation of the sample BS in operation, that is, a traction illusion generated by the drive circuit 21.
The measurement control circuit 23 performs a function of instructing the drive circuit 21 to generate a traction illusion and a function of generating the sample characteristic data D5 by collecting a measurement result D4 measured by the measurement circuit 22.
Since the present embodiment uses as an example the case in which the tactile device B uses vibrations to generate a traction illusion, the description of the present embodiment uses as an example the case of obtaining acceleration data by using an acceleration sensor as the objective sample characteristic data D5 representing the operation of the tactile device B, that is, a generated traction illusion. One conceivable specific example of the acceleration data is data representing the strength of vibration caused in the tactile device B, or the time or frequency response of the amplitude of acceleration as will be described later. As the sample characteristic data D5, it is possible to use data regarding speed, acceleration rate, position, force of the tactile device B, any combination thereof, or the time or frequency response thereof.
Next, a configuration of the feature computation apparatus 20B of the tactile device inspection system 1 according to the present embodiment will be described in detail with reference to
The feature computation apparatus 20B includes a reference data computation circuit 25 and a feature computation circuit 26 as main circuit units.
The reference data computation circuit 25 performs a function of computing reference data D6 by statistically processing the sample characteristic data D5 of a non-defective sample of the samples BS. The non-defective sample is determined as a non-defective item in the quality check result D3.
The feature computation circuit 26 performs a function of computing, for each sample BS, a match rate between the sample characteristic data D5 of the sample BS and the reference data D6 as a sample feature of the sample BS. The feature computation circuit 26 also performs a function of computing the reference feature D7 in accordance with the sample features of non-defective samples and the sample features of defective samples determined as defective items in the quality check result D3.
Next, a configuration of the inspection apparatus 30A of the tactile device inspection system 1 according to the present embodiment will be described in detail with reference to
The inspection apparatus 30A includes a drive circuit 31, a measurement circuit 32, and an inspection control circuit 33 as main circuit units.
The drive circuit 31 performs a function of generating a traction illusion by operating the connected inspection target BX in accordance with an instruction from the inspection control circuit 33.
The measurement circuit 32 performs a function of performing measurement processing to obtain the objective inspection target characteristic data D9 representing the operation of the inspection target BX in operation, that is, a traction illusion generated by the drive circuit 31.
The inspection control circuit 33 performs a function of instructing the drive circuit 31 to generate a traction illusion and a function of generating the inspection target characteristic data D9 by collecting an inspection result D8 obtained by the measurement circuit 32.
Since the present embodiment uses as an example the case in which the tactile device B uses vibrations to generate a traction illusion, the description of the present embodiment uses as an example the case of obtaining acceleration data by using an acceleration sensor as the objective inspection target characteristic data D9 representing the operation of the tactile device B, that is, a generated traction illusion. Conceivable specific examples of the acceleration data include data representing the strength of vibration caused in the tactile device B, or data representing the time or frequency response of the vibration strength as will be described later; in any of these cases, the inspection target characteristic data D9 and the sample characteristic data D5 need to be the same kind of data. As the inspection target characteristic data D9, it is possible to use data regarding speed, acceleration, position, force of the tactile device B, any combination thereof, or the time or frequency response thereof.
Next, a configuration of the determination apparatus 30B of the tactile device inspection system 1 according to the present embodiment will be described in detail with reference to
The determination apparatus 30B includes a determination processing circuit 35 and a display circuit 36 as main circuit units.
The determination processing circuit 35 performs a function of computing, for each inspection target BX, an inspection target feature Q indicating a feature of a traction illusion generated by the inspection target BX in accordance with the inspection target characteristic data D9 obtained by the inspection apparatus 30A and a function of determining the quality of the inspection target BX in accordance with a comparison result between the inspection target feature Q and the reference feature D7.
The display circuit 36 performs a function of displaying a determination result D10 indicating the quality of each inspection target BX obtained by the determination processing circuit 35 by using a display device such as a liquid crystal display (LCD) or light emitting diode (LED) display.
Next, an operation of the tactile device inspection system 1 according to the present embodiment will be described with reference to
For ease of understanding, it is assumed that a two-alternative forced choice task is used for the evaluation test of the sample BS by the test subject Y, in which a traction illusion is generated in either one of the two directions of the left and right directions with respect to the sample BS, and the test subject Y answers either one direction in which the test subject Y feels pulled.
Firstly, in
The quality check apparatus 10B computes the correct answer rate D2 for each sample BS in accordance with whether a particular traction illusion generated by the sample BS matches a subjective evaluation result of the particular traction illusion carried out by the test subject Y, that is, the answer operation Do, which are included in the test result D1 obtained by the test apparatus 10A (step 114).
Subsequently, the quality check apparatus 10B determines a threshold for quality determination by statistically processing the computed correct answer rates D2 of the respective samples BS and generates the quality check result D3 with respect to each sample BS by processing the correct answer rate D2 of the sample BS in accordance with the determined threshold and accordingly checking the quality of the sample BS (step 115). The quality check apparatus 10B then outputs the generated quality check result D3 to the feature computation apparatus 20B (step 116).
As for the sample BS2, the number of correct answers by the test subject Y is nine in the case of generating traction illusions ten times in the right direction; the number of correct answers by the test subject Y is seven in the case of generating traction illusions ten times in the left direction; and the total number of correct answers M is eighteen. Since the test count N of both the left and right directions is twenty, the correct answer rate reference feature of the sample BS1 is 90%.
Next, referring to
Subsequently, the measurement apparatus 20A generates, in accordance with the measurement result D4 based on the characteristic signal S1, the objective sample characteristic data D5 such as acceleration data, more specifically, data representing, for example, the time or frequency response of the amplitude of acceleration rate (step 122) and outputs the objective sample characteristic data D5 to the feature computation apparatus 20B (step 123).
The feature computation apparatus 20B computes the reference data D6 by statistically processing the sample characteristic data D5 of the non-defective samples BS determined as non-defective items in the quality check result D3 (step 130) and outputs the reference data D6 to the determination apparatus 30B (step 131).
The feature computation apparatus 20B computes, for each sample BS, a match rate between the sample characteristic data D5 of the sample BS and the reference data D6 obtained by the feature computation apparatus 20B as a sample feature of the sample BS (step 132). The feature computation apparatus 20B then computes the reference feature D7 in accordance with the sample features of non-defective samples and the sample features of defective samples determined as defective items in the quality check result D3 (step 133) and outputs the reference feature D7 to the determination apparatus 30B (step 134).
Thus, it is possible to check the quality of the inspection target BX by statistically processing the sample characteristic data D5 of non-defective samples, accordingly computing a representative value such as a mean or median value of the characteristic data Wg(t) of the non-defective sample group as a reference characteristic 40, that is, reference data Ws(t), and computing a feature Q indicating a match rate between the reference data Ws(t) and characteristic data W(t) of the inspection target BX. As a specific example of the feature Q, it is possible to use the residual sum of squares of the reference data Ws(t) and the characteristic data W(t) as expressed as the following expression (1).
Thus, it is possible to check the quality of the inspection target BX by statistically processing the sample characteristic data D5 of non-defective samples, accordingly computing a representative value such as a mean or median value of the characteristic data Wg(f) of the non-defective sample group as a reference characteristic 43, that is, reference data Ws(f), and computing the feature Q indicating a match rate between the reference data Ws(f) and characteristic data W(f) of the inspection target BX. As a specific example of the feature Q, it is possible to use the residual sum of squares of the reference data Ws(f) and the characteristic data W(f) as expressed as the following expression (2).
The feature Q may be a feature other than the residual sum of squares, such as a feature of skewness, consistency, similarity, proximity, or conformity. The feature Q may be extracted by using machine learning.
The determination of the quality of the inspection target BX by using the feature Q needs the reference feature D7, that is, Qs to process the feature Q in accordance with a threshold.
Next, referring to
Subsequently, the inspection apparatus 30A generates, in accordance with the inspection result D8 based on the characteristic signal S2, the objective inspection target characteristic data D9 such as acceleration data, more specifically, data representing, for example, the time or frequency response of the amplitude of acceleration rate (step 142) and outputs the objective inspection target characteristic data D9 to the determination apparatus 30B (step 143).
Subsequently, the determination apparatus 30B computes, for each inspection target BX, a match rate between the inspection target characteristic data D9 of the inspection target BX and the reference data D6 obtained by the feature computation apparatus 20B as the inspection target feature Q of the inspection target BX (step 144).
The determination apparatus 30B then compares the inspection target feature Q of each inspection target BX and the reference feature D7, that is, Qs obtained by the feature computation apparatus 20B and determines the quality of operation of the inspection target BX in accordance with the obtained comparison result (step 145). The determination apparatus 30B displays the obtained determination result D10 by using the display circuit 36 (step 146) and ends the series of steps of the tactile device inspection operation.
As described above, the present embodiment is configured as described below. The test apparatus 10A obtains the test result D1 indicating a subjective evaluation result by a test subject with regard to a traction illusion generated by a prepared sample BS of the tactile device B. The quality check apparatus 10B checks the quality of the sample BS in accordance with the test result D1. The measurement apparatus 20A performs measurement processing to obtain the objective sample characteristic data D5 representing the traction illusion generated by the sample BS. The feature computation apparatus 20B computes the reference feature Qs(D7) to be used to determine quality of the inspection target BX of the tactile device B in accordance with the quality check result D3 indicating the quality of the sample BS and the sample characteristic data D5. The inspection apparatus 30A performs measurement processing to obtain the inspection target characteristic data D9 representing the traction illusion generated by the inspection target BX. The determination apparatus 30B computes, for each inspection target BX, the inspection target feature Q indicating a feature of the traction illusion generated by the inspection target BX in accordance with the obtained inspection target characteristic data D9. In accordance with a comparison result of the inspection target feature Q to the reference feature Qs, the quality of the inspection target BX is determined.
As such, by using the reference feature Qs previously computed, it is possible to objectively determine the quality of a manufactured item to be shipped out, that is, the inspection target BX of the tactile device B without evaluation based on personal views, and as a result, it is possible to maintain a consistent level of quality of manufactured items to be shipped out. Although the evaluations based on personal views of test subjects are necessary to compute the reference feature Qs, these evaluations are made by using only the prepared samples BS of the tactile device B. For this reason, it is necessary only to perform measurement processing to obtain the inspection target characteristic data D9 of the manufactured item to be shipped out, compute the inspection target feature Q, and compare the inspection target feature Q with the reference feature Qs, and thus, it is possible to automatize the inspection before shipping and greatly improve the efficiency of the inspection.
In the present embodiment, the quality check apparatus 10B may compute the correct answer rate D2 of each sample BS in accordance with corresponding subjective evaluation results included in the test result D1, compute the threshold Th for quality determination of the sample BS in accordance with the distribution of the obtained correct answer rates D2, and check the quality of the sample BS in accordance with a comparison result of the correct answer rate D2 of the sample BS to the threshold Th.
With this configuration, it is unnecessary to previously determine the quality of the sample BS in accordance with evaluations based on personal views, and as a result, the workload and time required for computing the reference feature D7 can be greatly reduced.
In the present embodiment, the two-alternative forced choice task may be used to carry out subjective evaluation results by the test subject Y with the use of the test apparatus 10A.
With this configuration, it is possible to greatly reduce the load and time required for quality check of the sample BS by using the quality check apparatus 10B.
In the present embodiment, the feature computation apparatus 20B may compute the reference data D6 as a criterion by statistically processing the sample characteristic data D5 of non-defective samples BS determined as non-defective items in the quality check result D3, compute, for each sample BS, a match rate between the sample characteristic data D5 of the sample BS and the reference data D6 as the sample feature Q of the sample BS, and compute the reference feature D7 in accordance with sample features of the non-defective samples and sample features of defective samples determined as defective items in the quality check result D3.
With this configuration, the feature computation apparatus 20B can highly accurately compute the reference feature D7.
In the present embodiment, as the sample characteristic data D5 and the inspection target characteristic data D9, data about the vibration strength of the tactile device B may be used. Specifically, data representing the time or frequency response of the vibration strength may be used.
With this configuration, as the feature to be used to determine quality, it is possible to compute a very suitable value representing the operation of the tactile device B generating a traction illusion by vibrations.
Next, a tactile device inspection system 2 according to a second embodiment of the present invention will be described with reference to
As illustrated in
The tactile device B is built in the slim and small portable electronic device 90. Actuators A1 and A2 for generating traction illusions in the tactile device B are arranged at left and right grip portions of the electronic device 90. A screen display unit 91 and a touch panel 92 are provided at the center portion of the electronic device 90.
Operating buttons 93 and 94 are also arranged at the center portion of the electronic device 90. The operating buttons 93 and 94 are used to receive the answer operation Do performed by the test subject Yin the subjective evaluation test of the tactile device B. The operating buttons 93 and 94 are configured as operation signs by using the screen display unit 91 and the touch panel 92 but key buttons for changing the position in up and down directions in accordance with operations may be used.
In the present embodiment, it is assumed that a two-alternative forced choice task is used for the evaluation test of the tactile device B by the test subject Y, in which the actuators A1 and A2 of the tactile device B generate an illusion of turning and pulling force in either one of the two directions of the clockwise and counterclockwise directions, and the test subject Y answers, by using the operating button 93 or 94, either one direction in which the test subject Y feels turned and pulled. For example, when the actuator A1 generates a traction illusion in a direction away from the test subject Y and the actuator A2 generates a traction illusion in a direction toward the test subject Y, an illusion of turning and pulling force is generated in the clockwise direction; when the traction illusions are generated in the reverse directions, an illusion of turning and pulling force is generated in the counterclockwise direction. The method of the evaluation test conducted by the test subject Y is basically identical to
The electronic device 90 includes the test apparatus 10A, the measurement apparatus 20A, and the inspection apparatus 30A in
In the present embodiment, of the electronic devices 90, an electronic device 90 prepared as a sample to compute a reference feature to be used to determine quality is referred to as an electronic device 90S; the tactile device B built in the electronic device 90S corresponds to the sample BS. Additionally, an electronic device 90 targeted for actual inspection is referred to as an electronic device 90X; the tactile device B built in the electronic device 90X corresponds to the inspection target BX.
As illustrated in
The communication I/F circuit 51 performs a function of receiving the test result D1, the sample characteristic data D5, and the inspection target characteristic data D9 from the electronic devices 90 by communicating with the electronic devices 90 with or without wire connections to receive data.
The arithmetic processing circuit 52 includes a C reference feature U and a peripheral circuit. The arithmetic processing circuit 52 performs a function of implementing, by using the C reference feature U running a pre-installed program, various processing units for checking the quality of the tactile device B.
Main processing units implemented by the arithmetic processing circuit 52 are a data acquisition unit 52A, a quality check unit 52B, a feature computation unit 52C, and a determination processing unit 52D.
The data acquisition unit 52A performs a function of obtaining the test result D1 and the objective sample characteristic data D5 from the electronic device 90S serving as a sample by communicating with the electronic device 90S via the communication I/F circuit 51 to obtain data and storing the test result D1 and the objective sample characteristic data D5 in the storage circuit 53. The data acquisition unit 52A also performs a function of obtaining the objective inspection target characteristic data D9 from the electronic device 90X targeted for inspection by communicating with the electronic device 90X via the communication I/F circuit 51 to obtain data and storing the objective inspection target characteristic data D9 in the storage circuit 53.
The quality check unit 52B performs a function of checking the quality of the sample BS in accordance with the test result D1 in the storage circuit 53 and storing the obtained quality check result D3 in the storage circuit 53.
The feature computation unit 52C corresponds to the feature computation apparatus 20B in
The determination processing unit 52D corresponds to the determination apparatus 30B in
The storage circuit 53 is constituted by a storage device, such as a hard disk or a semiconductor memory. The storage circuit 53 performs a function of storing the various kinds of processing data and program used to check the quality of the tactile device. The program is read beforehand from an external device or storage medium (both not illustrated in the drawing) coupled to the tactile device inspection apparatus 50 and stored in the storage circuit 53.
The display circuit 54 performs a function of displaying the determination result D10 indicating the quality of each inspection target BX (electronic device 90) obtained by the arithmetic processing circuit 52 by using a display device such as an LCD or LED display.
Next, an operation of the tactile device inspection system 2 according to the present embodiment will be described with reference to
The operation of the tactile device inspection system 2 according to the present embodiment is basically identical to
Firstly, referring to
The electronic device 90S detects, by using the operating buttons 93 and 94, the answer operation Do of the test subject Y indicating a subjective evaluation result of the traction illusion generated by the built-in tactile device B (step 203), generates the test result D1 by collecting the detected answer operation Do (step 204), and sends the test result D1 to the tactile device inspection apparatus 50 (step 205).
These steps 200 to 205 are repeated for the individual electronic devices 90S of the tactile devices B targeted for inspection and also for the individual test subjects Y.
The tactile device inspection apparatus 50 computes the correct answer rate D2 for each sample BS in accordance with whether a particular traction illusion generated by the sample BS matches a subjective evaluation result of the particular traction illusion carried out by the test subject Y, that is, the answer operation Do, which are included in the test result D1 obtained by each electronic device 90S (step 210).
The tactile device inspection apparatus 50 determines a threshold for quality determination by statistically processing the computed correct answer rates D2 of the respective samples BS and generates the quality check result D3 with respect to each sample BS by processing the correct answer rate D2 of the sample BS in accordance with the determined threshold and accordingly checking the quality of the sample BS (step 211).
Next, the tactile device inspection apparatus 50 computes the reference data D6 by statistically processing the sample characteristic data D5 of non-defective devices determined as non-defective items in the quality check result D3 out of the sample characteristic data D5 received from the electronic devices 90S (step 212).
Subsequently, the tactile device inspection apparatus 50 computes, for each sample BS, a match rate between the sample characteristic data D5 of the sample BS and the reference data D6 as the sample feature Q of the sample BS (step 213). The tactile device inspection apparatus 50 computes the reference feature D7 in accordance with the sample features of the non-defective devices and the sample features of defective devices determined as defective items in the quality check result D3 (step 214).
After this, referring to
The tactile device inspection apparatus 50 computes, for each electronic device 90X, the inspection target feature Q of the inspection target BX of the electronic device 90X (step 223). The tactile device inspection apparatus 50 then determines the quality of operation of the inspection target BX in accordance with a comparison result of the inspection target feature Q to the reference feature D7 previously computed, that is, Qs (step 224), displays the obtained determination result D10 by using the display circuit 54 (step 225), and ends the series of steps of the tactile device inspection operation.
As described above, in the present embodiment, each electronic device 90 includes the test apparatus 10A, the measurement apparatus 20A, and the inspection apparatus 30A of the tactile device inspection system 1 in
More specifically, the present embodiment is configured as described below. In the arithmetic processing circuit 52 of the tactile device inspection apparatus 50, the data acquisition unit 52A obtains, from the prepared sample BS of the tactile device B, the test result D1 indicating a subjective evaluation result made by the test subject Y with respect to a traction illusion generated by the sample BS and the objective sample characteristic data D5 representing the traction illusion and also obtains, from the inspection target BX of the tactile device B targeted for inspection, the objective inspection target characteristic data D9 representing a traction illusion generated by the inspection target BX. The quality check unit 52B checks the quality of the sample BS in accordance with the test result D1. In accordance with the quality check result D3 indicating the quality of the sample BS and the sample characteristic data D5, the feature computation unit 52C computes the reference feature Qs to be used to determine quality of the inspection target BX. The determination processing unit 52D computes, for each inspection target BX, the inspection target feature Q indicating a feature of a traction illusion generated by the inspection target BX in accordance with the inspection target characteristic data D9 and determines the quality of the inspection target BX in accordance with a comparison result of the inspection target feature Q to the reference feature Qs.
With this configuration, it is possible to individually use the test result D1 and the sample characteristic data D5 that are obtained by the respective electronic devices 90S serving as samples in parallel for each of the electronic devices 90S, and as a result, it is possible to greatly reduce the operating time required for the subjective evaluation test conducted by the test subject Y.
The present invention has been described above in accordance with the embodiments, but the present invention is not limited to the embodiments described above. Various modifications to the configurations and details of the embodiments of the present invention, which are readily understood by those skilled in the art, may be made without departing from the scope of the invention. The embodiments may be combined with each other in any manner when there is no contradiction.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-062848 | Mar 2019 | JP | national |
This application is a national phase entry of PCT Application No. PCT/JP2020/011101, filed on Mar. 28, 2019, which application is hereby incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2020/011101 | 3/13/2020 | WO | 00 |
