Ultrasonic transducer module, ultrasonic therapeutic instrument, and control method

Abstract

The present application discloses an ultrasonic transducer module, an ultrasonic therapeutic instrument, and a control method. The present application relates to the technical field of ultrasonic therapy. The ultrasonic transducer module comprises a transducer array and a transducer control circuit, wherein the transducer array comprises a plurality of transducer sub-arrays, the transducer control circuit is connected to each of the transducer sub-arrays, and each of the transducer sub-arrays comprises a plurality of transducers. The transducer control circuit is configured for taking the transducer sub-arrays as control units and triggering the operation of each of the transducer sub-arrays.

Description

Ultrasonic transducer module, ultrasonic therapy device and control method

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202410829115.5, filed on June 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of ultrasound therapy technology, and in particular to an ultrasound transducer module, an ultrasound therapy device, and a control method. Background Technology

[0004] The transducer is the core component of an ultrasonic therapy device (such as an ultrasonic beauty device or ultrasonic fat reduction device), used to convert electrical energy into sound wave energy. The more transducers there are, the higher the treatment efficiency of the ultrasonic therapy device. Therefore, the treatment efficiency of an ultrasonic therapy device can be improved by increasing the number of transducers. However, increasing the number of transducers will increase the total power requirement. In addition, different transducers usually have different impedances, making it difficult to ensure consistency. When powered simultaneously, different transducers will receive different voltages, which will lead to uneven energy emission.

[0005] Therefore, the addition of transducers complicates the coordination and control of each transducer in an ultrasound therapy device, thereby affecting the accuracy of transducer control. Summary of the Invention

[0006] The main objective of this application is to provide an ultrasonic transducer module, an ultrasonic therapy device, and a control method, which aims to improve the control accuracy of an ultrasonic therapy device containing multiple transducers in terms of transducer control.

[0007] To achieve the above objectives, this application provides an ultrasonic transducer module, which includes a transducer array and a transducer control circuit. The transducer array includes multiple transducer sub-arrays, and the transducer control circuit is connected to each of the transducer sub-arrays. Each transducer sub-array includes multiple transducers.

[0008] The transducer control circuit is used to trigger the operation of each transducer subarray, with the transducer subarray as the control unit.

[0009] In one embodiment, the transducer control circuit includes a clock module and multiple trigger modules, the number of which is the same as the number of transducer subarrays;

[0010] Each of the aforementioned trigger modules is connected in series to the output terminal of the clock module, and the output terminal of the trigger module is connected to the transducer subarray;

[0011] Each of the triggering modules receives the clock signals output by the clock module in sequence according to its own clock signal receiving order, so as to cyclically trigger the operation of each of the transducer subarrays.

[0012] In one embodiment, the triggering module includes at least one of a D trigger, an SR trigger, a T trigger, or a JK trigger.

[0013] In one embodiment, the upper electrodes of each transducer in the same transducer subarray are electrically connected to each other, and the lower electrodes are electrically connected to each other.

[0014] In one embodiment, the upper electrodes of each transducer in the same transducer subarray share a common layer, the lower electrodes share a common layer, and the piezoelectric layers between the upper and lower electrodes are spaced apart from each other.

[0015] In one embodiment, the transducers included in the transducer array operate at frequencies between 200 kHz and 15 MHz.

[0016] In one embodiment, each of the transducer subarrays is obtained by grouping the transducer arrays in a radial diffusion manner with their midpoint as the center.

[0017] In one embodiment, the treatment depth of each of the transducer subarrays may be the same, not the same, or not the same.

[0018] In one embodiment, each of the transducer subarrays is focused at a different position parallel to the skin surface.

[0019] In one embodiment, when each of the transducer subarrays operates cyclically, the spatial locations of transducer subarrays with adjacent triggering times are not adjacent.

[0020] To achieve the above objectives, this application also provides an ultrasonic therapy device, which includes the ultrasonic transducer module described above.

[0021] To achieve the above objectives, this application also provides a control method applied to the aforementioned ultrasonic transducer module, the control method comprising:

[0022] Obtain the operating order of each transducer subarray of the transducer module;

[0023] The operation of each transducer subarray is controlled based on its operating order.

[0024] To achieve the above objectives, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method described above.

[0025] This application provides an ultrasonic transducer module, which includes a transducer array and a transducer control circuit. The transducer array includes multiple transducer subarrays, and the transducer control circuit is connected to each transducer subarray. Each transducer subarray includes multiple transducers. The transducer control circuit is used to trigger the operation of each transducer subarray, with the transducer subarray as the control unit.

[0026] This application groups the transducer array into multiple transducer subarrays, and triggers each subarray to operate on a unit basis through a transducer control circuit. Therefore, regardless of the operating time, only one subarray needs to be triggered, meaning only a portion of the transducers in the array need to be activated. This reduces the number of transducers requiring coordination and control, overcoming the technical drawback of excessive transducer control affecting accuracy due to too many transducers requiring coordination and control at the same time. This improves the control accuracy of ultrasound therapy devices containing multiple transducers in terms of transducer control. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 is a schematic diagram of the module structure of the ultrasonic transducer module according to an embodiment of this application;

[0030] Figure 2 is a schematic diagram of a linear array of transducers according to an embodiment of this application;

[0031] Figure 3 is a schematic diagram of the transducer array being an array arrangement according to an embodiment of this application;

[0032] Figure 4 is a schematic diagram of a group of transducer arrays according to an embodiment of this application;

[0033] Figure 5 is a schematic diagram of the module structure of the transducer control circuit according to an embodiment of this application;

[0034] Figure 6 is a schematic diagram of the module structure of the transducer control circuit in an embodiment of this application when the trigger module includes a D flip-flop.

[0035] Figure 7 is a timing control diagram of the transducer control circuit according to an embodiment of this application;

[0036] Figure 8 is a schematic diagram of a group of rectangular array transducers according to an embodiment of this application.

[0037] Figure 9 is a schematic diagram of a group of transducer arrays in a circular array according to an embodiment of this application;

[0038] Figure 10 is a schematic diagram of a group of linear arrays of transducers according to an embodiment of this application.

[0039] Figure 11 is a flowchart illustrating the control method according to an embodiment of this application.

[0040] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Embodiments of the present invention

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Ultrasound is a high-frequency mechanical wave with tissue-penetrating and energy-depositing properties. In the field of ultrasound therapy, ultrasound transducers generate ultrasound waves, which act on living organisms, exerting corresponding biological effects through the thermal, cavitation, and mechanical effects produced by the interaction between ultrasound waves and biological tissues. Currently, ultrasound therapy is widely used in cancer treatment, neurology, cardiology, gynecology, urology, orthopedics, and dermatology, among other fields.

[0043] Currently, ultrasound aesthetics and ultrasound liposuction are two major hot topics in the field of ultrasound therapy. Ultrasound aesthetics refers to using the thermal effect of ultrasound waves to locally heat the skin or subcutaneous tissue, promoting the contraction of collagen fibers and the formation of new collagen, thereby achieving medical effects such as tightening and wrinkle reduction. Ultrasound liposuction refers to using the mechanical, thermal, cavitation, or combined effects of ultrasound waves to destroy fat tissue in specific areas of the body, such as the abdomen, thighs, buttocks, and upper arms, causing the fat tissue to break down, fragment, or die, thereby reducing the amount of fat tissue and achieving a fat reduction effect.

[0044] The transducer is the core component of an ultrasonic therapy device (such as an ultrasonic beauty device or ultrasonic fat reduction device), used to convert electrical energy into sound wave energy. The more transducers there are, the higher the treatment efficiency of the ultrasonic therapy device. Therefore, the treatment efficiency of an ultrasonic therapy device can be improved by increasing the number of transducers. However, increasing the number of transducers will increase the total power requirement. In addition, the impedance of different transducers is usually different, making it difficult to ensure consistency. When powered simultaneously, the voltage received by different transducers will vary, which will lead to uneven energy emission, a problem that is usually difficult to predict.

[0045] Therefore, the addition of transducers complicates the coordination and control of each transducer in an ultrasound therapy device, thereby affecting the accuracy of transducer control.

[0046] Therefore, improving the control accuracy of ultrasound therapy devices with multiple transducers in terms of transducer control is an urgent problem to be solved.

[0047] Based on this, this application proposes an ultrasonic transducer module according to a first embodiment. Referring to Figure 1, the ultrasonic transducer module includes a transducer array 10 and a transducer control circuit 20. The transducer array 10 includes multiple transducer subarrays. Each output terminal of the transducer control circuit 20 is connected to each transducer subarray. The transducer control circuit 20 is used to trigger the operation of each transducer subarray, with the transducer subarray as the control unit.

[0048] It should be noted that the transducer array 10 can be a linear array as shown in Figure 2, or an array-type array as shown in Figure 3. This embodiment does not specifically limit this. When the transducer array 10 is an array-type array, the transducer array 10 can be a rectangular, circular, rhomboid, triangular, pentagonal, or other area array.

[0049] When grouping the transducer array to obtain multiple transducer subarrays, in one embodiment, the number of transducers can be used as the grouping basis, so that the number of transducers contained in each transducer subarray obtained by grouping can be all the same, all different, or all different.

[0050] In one embodiment, the treatment depth can be used as the grouping criterion so that the treatment depths of the transducer subarrays obtained by the grouping can be all the same, all different, or all different.

[0051] The treatment depth of the transducer subarray is used to characterize the overall treatment depth of each transducer within the subarray. Treatment depth refers to the depth of human tissue that a transducer can affect when it is operating.

[0052] In one embodiment, grouping can be based on geometry. For example, each transducer subarray can be grouped by the transducer array 10 in a radial diffusion manner with its own midpoint as the center.

[0053] In one embodiment, each transducer subarray can be focused onto a different position parallel to the skin surface.

[0054] In this implementation, where each transducer subarray focuses on different positions parallel to the skin surface, the spatial positions of different transducer subarrays with adjacent activation sequences (i.e., trigger sequences) are not adjacent during the cyclical operation of these subarrays. This approach avoids the occurrence of severe local pain caused by two spatially adjacent treatment points being continuously affected by ultrasound energy within a short period. It is understood that different positions parallel to the skin surface can be at the same depth or at different depths.

[0055] In one embodiment, the upper electrodes of each transducer in the same transducer subarray are electrically connected to each other, and the lower electrodes are electrically connected to each other. That is, in the same transducer subarray, the upper electrodes of each transducer share a common potential and can be controlled simultaneously by an electrical signal, and the lower electrodes share a common potential and can be controlled simultaneously by the same electrical signal. However, the transducers in the same transducer subarray cannot be controlled independently.

[0056] Furthermore, the transducer array 10 may also include a backing plate 11, on which the upper electrodes of each transducer in the same transducer subarray share a common layer, the lower electrodes share a common layer, and the piezoelectric layers between the upper and lower electrodes are spaced apart from each other, that is, the piezoelectric layers of each transducer in the same transducer subarray are relatively independent.

[0057] It should be noted that the material of the backing plate 11 can be a rigid material or a flexible material, and this embodiment does not make a specific limitation on it.

[0058] For example, referring to Figure 4, assuming that the transducer array 10 includes four transducer subarrays A, B, C, and D as shown in the figure, the transducer control circuit 20 can cyclically trigger the operation of the four transducer subarrays A, B, C, and D in the order of "A → B → C → D".

[0059] In one embodiment, referring to FIG5, the transducer control circuit 20 may include a clock module 21 and a plurality of trigger modules 22, the number of trigger modules 22 being the same as the number of transducer subarrays; each trigger module 22 is connected in series to the output terminal of the clock module 21, and the output terminal of the trigger module 22 is connected to the transducer subarray; each trigger module 22 receives the clock signal output by the clock module 21 in sequence according to its own clock signal receiving order, so as to cyclically trigger the operation of each transducer subarray.

[0060] It should be noted that the clock module 21 can be composed of a clock circuit, and the trigger module 22 can be composed of a flip-flop, such as at least one of a D flip-flop, SR flip-flop, T flip-flop or JK flip-flop, or it can be composed of a trigger circuit. This embodiment does not specifically limit the composition of the trigger module 22.

[0061] For example, taking a transducer array 10 including four transducer subarrays A, B, C, and D as shown in Figure 4, and a trigger module 22 including a D flip-flop, a transducer control circuit 20 as shown in Figure 6 can be obtained. Specifically, the input terminal of D flip-flop 1 is connected to the output terminal of clock module 21 and transducer subarray A; the output terminal of D flip-flop 1 is connected to the input terminal of D flip-flop 2 and transducer subarray B; the output terminal of D flip-flop 2 is connected to the input terminal of D flip-flop 3 and transducer subarray C; the output terminal of D flip-flop 3 is connected to the input terminal of D flip-flop 4; and the output terminal of D flip-flop 4 is connected to transducer subarray D. After clock module 21 outputs a clock signal, D flip-flop 1, D flip-flop 2, D flip-flop 3, and D flip-flop 4 will receive the clock signal in sequence, thereby forming the timing control diagram shown in Figure 7, to cyclically control the operation of the transducers in transducer subarrays A, B, C, and D.

[0062] In this embodiment, the transducer array 10 is grouped into multiple transducer subarrays, and the transducer control circuit 20 triggers the operation of each transducer subarray on a unit basis. Therefore, regardless of the operating time, only one transducer subarray needs to be triggered, meaning only a portion of the transducers in the array need to be activated. This reduces the number of transducers requiring coordination and control, overcoming the technical defect that excessive numbers of transducers requiring coordination and control at the same operating time negatively impact the control accuracy. This improves the control accuracy of ultrasound therapy devices containing multiple transducers in terms of transducer control.

[0063] In addition, since each transducer subarray in this embodiment is connected to the transducer control circuit 20 respectively, that is, each transducer subarray is connected to the transducer control circuit through different control lines, multiple control lines are laid in the ultrasonic therapy device. Thus, the control of each transducer subarray of the ultrasonic therapy device can be achieved through multiple control lines, avoiding the inconvenience of maintenance personnel to maintain the ultrasonic therapy device when using a single control line to control each transducer of the ultrasonic therapy device, thereby improving the maintenance convenience of the ultrasonic therapy device.

[0064] Understandably, in the field of ultrasonic ablation technology, it is typically necessary to simultaneously control multiple ultrasonic transducers, focusing them on the same lesion point to instantly reach a high temperature and destroy the tissue. Therefore, due to the high energy requirements, ultrasonic ablation technology necessitates instantaneous control of the emission of all ultrasonic transducers. Consequently, time-sharing control of transducers is not feasible in ultrasonic ablation technology. This embodiment, however, aims to improve the control accuracy of multi-transducer ultrasonic therapy devices in the fields of skin rejuvenation and fat reduction through grouped time-sharing control. Therefore, the related technical means of this embodiment cannot be incorporated into the field of ultrasonic ablation technology.

[0065] Based on the first embodiment described above, a second embodiment of the ultrasonic transducer module of this application is proposed, wherein the operating frequency of each transducer included in the transducer array 10 is between 200kHz and 15MHz.

[0066] Understandably, if the operating frequencies of the transducers in transducer array 10 are between 200kHz and 15MHz, it indicates that the ultrasound therapy device located in transducer array 10 is performing cosmetic or fat reduction treatment. During cosmetic or fat reduction treatment, the transducers located in the center of transducer array 10 need to operate simultaneously to ensure the uniformity of treatment and thus guarantee the therapeutic effect. Therefore, when the ultrasound therapy device in transducer array 10 is performing cosmetic or fat reduction treatment, grouping can be done using a radiating diffusion method centered on the midpoint of transducer array 10.

[0067] For example, when grouping transducer array 10 with its midpoint as the center and using a radiating diffusion method to the periphery of transducer array 10, please refer to Figures 8, 9, and 10. If transducer array 10 is a rectangular array, then after grouping with its midpoint as the center and using a radiating diffusion method to the periphery of transducer array 10, two transducer subarrays, A and B, as shown in Figure 8, can be obtained; if transducer array 10 is a circular array, then after grouping with its midpoint as the center and using a radiating diffusion method to the periphery of transducer array 10, two transducer subarrays, A and B, as shown in Figure 9, can be obtained; if transducer array 10 is a linear array, then after grouping with its midpoint as the center and using a radiating diffusion method to the periphery of transducer array 10, two transducer subarrays, A and B, as shown in Figure 10, can be obtained.

[0068] Understandably, in the field of ultrasound detection technology, the general application scenarios are detecting the presence or absence of a target object, determining its relative value, and confirming its tissue structure. In these processes, detailed consideration of the required ultrasound energy is not necessary. However, in the field of ultrasound therapy for skin rejuvenation and fat reduction, which this embodiment addresses, the ultrasound energy needs to accumulate to a certain absolute value to achieve the desired therapeutic effect. Therefore, in the field of ultrasound therapy for skin rejuvenation and fat reduction, it is necessary to ensure the uniformity of ultrasound energy. Consequently, the relevant technical means of this embodiment cannot be incorporated into the field of ultrasound detection technology.

[0069] Based on the first and / or second embodiments described above, a third embodiment of the ultrasonic transducer module of this application is proposed. In the third embodiment, if the transducer array 10 includes transducers for multiple treatment depths, when the transducer control circuit 20 uses the transducer sub-array as the control unit to trigger the operation of each transducer sub-array included in the transducer array 10, the transducer control circuit 20 can trigger all transducers in the transducer sub-array to operate, or it can trigger the transducers in the transducer sub-array that belong to the target treatment depth to operate. This embodiment does not specifically limit this.

[0070] It is understandable that the transducer array 10 may simultaneously include transducers with multiple treatment depths, such as 0.5mm, 1.5mm, 2.0mm, 3.0mm, 4.5mm, 6.0mm, 8.0mm, 9.0mm, 11mm, 13mm, 46mm, or other treatment depths within the range of 0.5mm-50mm. However, in actual treatment, most patients' skin may only be able to withstand a treatment depth of no more than 9mm. Therefore, if transducers of all treatment depths are activated and controlled, the patient's skin may be damaged because some of the activated and controlled transducers contain transducers with treatment depths that the patient's skin cannot withstand, thereby affecting the safety and effectiveness of the treatment.

[0071] Therefore, by limiting the transducer control circuit 20 to use the transducer subarray as the control unit, when triggering the operation of each transducer subarray, this embodiment can only trigger the transducers in the transducer subarray that belong to the target treatment depth. This avoids the impact on the safety and efficacy of the treatment caused by activating and controlling the operation of transducers that do not need to work during the treatment process, thus ensuring the safety and efficacy of the treatment.

[0072] This application also provides an ultrasound therapy device, which includes the aforementioned ultrasound transducer module. This ultrasound therapy device can be a focused ultrasound therapy device, a non-focused ultrasound therapy device, or a combination of focused and non-focused ultrasound therapy devices; this embodiment does not specifically limit it in this regard.

[0073] It is understood that since the ultrasonic transducer module described above is used in the ultrasonic therapy device, the embodiments of the ultrasonic therapy device include all the technical solutions of all embodiments of the ultrasonic transducer module described above, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0074] This application embodiment also provides a control method applied to the above-mentioned ultrasonic transducer module. Referring to Figure 11, the control method includes steps S10 to S20:

[0075] Step S10: Obtain the operating order of each transducer subarray of the transducer module;

[0076] It should be noted that the working order is used to characterize the working sequence of the transducer subarray.

[0077] In one embodiment, the operating order of the transducer subarrays can be set according to the position information of the transducer subarrays in the transducer array. Specifically, the position information of each transducer subarray in the transducer array is obtained, and the operating order of each transducer subarray is configured according to the order of the position information of each transducer subarray.

[0078] Step S20: Control the operation of each transducer subarray based on the working order of each transducer subarray.

[0079] For example, suppose there are transducer subarrays A, B, and C, and the working order of transducer subarray A is before that of transducer subarray B, and the working order of transducer subarray B is before that of transducer subarray C. Then the transducer subarrays A, B, and C can be cyclically controlled in the order of "transducer subarray A → transducer subarray B → transducer subarray C".

[0080] In one embodiment, when the ultrasonic transducer module includes a large number of transducer subarrays, the operation of each transducer subarray is controlled based on its operating order, following the principle that "transducer subarrays with adjacent operating orders are not adjacent in spatial location." Specifically, from the remaining inactive transducer subarrays, a transducer subarray that is not adjacent to the currently or previously activated transducer subarray can be randomly selected as the transducer subarray for the next activation order.

[0081] The control method provided in this application can improve the control accuracy of an ultrasound therapy device containing multiple transducers in terms of transducer control. Compared with the prior art, the beneficial effects of the control method provided in this application are the same as those of the ultrasound transducer module provided in the above embodiments, and will not be repeated here.

[0082] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method described above.

[0083] The computer program product provided in this application can improve the control accuracy of an ultrasound therapy device containing multiple transducers in terms of transducer control. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the control method provided in the above embodiments, and will not be repeated here.

[0084] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. An ultrasonic transducer module, wherein, The ultrasonic transducer module includes a transducer array and a transducer control circuit. The transducer array includes multiple transducer sub-arrays. The transducer control circuit is connected to each of the transducer sub-arrays. Each transducer sub-array includes multiple transducers. The transducer control circuit is used to trigger the operation of each transducer subarray, with the transducer subarray as the control unit.

2. The ultrasonic transducer module as described in claim 1, wherein, The transducer control circuit includes a clock module and multiple trigger modules, the number of which is the same as the number of transducer subarrays. Each of the aforementioned trigger modules is connected in series to the output terminal of the clock module, and the output terminal of the trigger module is connected to the transducer subarray; Each of the triggering modules receives the clock signals output by the clock module in sequence according to its own clock signal receiving order, so as to cyclically trigger the operation of each of the transducer subarrays.

3. The ultrasonic transducer module as described in claim 2, wherein, The triggering module includes at least one of D triggers, SR triggers, T triggers, or JK triggers.

4. The ultrasonic transducer module as described in claim 1, wherein, The upper electrodes of each transducer in the same transducer subarray are electrically connected to each other, and the lower electrodes are electrically connected to each other.

5. The ultrasonic transducer module as described in claim 4, wherein, The upper electrodes of each transducer in the same transducer subarray share a common layer, the lower electrodes share a common layer, and the piezoelectric layers between the upper and lower electrodes are spaced apart from each other.

6. The ultrasonic transducer module as described in any one of claims 1 to 5, wherein, The transducer array contains transducers whose operating frequencies are between 200 kHz and 15 MHz.

7. The ultrasonic transducer module as described in any one of claims 1 to 5, wherein, Each of the transducer subarrays is obtained by grouping the transducer array around its own midpoint in a radial diffusion manner.

8. The ultrasonic transducer module as described in any one of claims 1 to 5, wherein, The treatment depth of each of the transducer subarrays may be the same, not the same, or not the same.

9. The ultrasonic transducer module as described in any one of claims 1 to 5, wherein, Each of the transducer subarrays is focused at a different position parallel to the skin surface.

10. The ultrasonic transducer module as described in claim 9, wherein, When each of the transducer subarrays operates cyclically, the spatial positions of transducer subarrays with adjacent triggering times are not adjacent.

11. An ultrasonic therapy device, wherein, The ultrasonic therapy device includes an ultrasonic transducer module as described in any one of claims 1 to 10.

12. A control method applied to an ultrasonic transducer module as described in any one of claims 1 to 10, wherein, The control method includes: Obtain the operating order of each transducer subarray of the transducer module; The operation of each transducer subarray is controlled based on its operating order.

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