CN111665989A - Touch device, manufacturing method thereof, touch method and electronic equipment - Google Patents
Touch device, manufacturing method thereof, touch method and electronic equipment Download PDFInfo
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- CN111665989A CN111665989A CN202010518505.2A CN202010518505A CN111665989A CN 111665989 A CN111665989 A CN 111665989A CN 202010518505 A CN202010518505 A CN 202010518505A CN 111665989 A CN111665989 A CN 111665989A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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Abstract
The invention provides a touch device, comprising: a pressure detection unit configured to detect a touch pressure applied on the touch device; a touch detection unit configured to detect a touch signal applied to the touch device; a control unit configured to generate a touch instruction according to the touch signal in response to the touch pressure being within a pressure threshold range. The invention also provides a touch method, electronic equipment and a manufacturing method of the touch device. The touch device, the manufacturing method thereof, the touch method and the electronic equipment can better solve the problem of mistaken touch of the touch device.
Description
Technical Field
The present invention relates to the field of touch technologies, and in particular, to a touch device, a manufacturing method thereof, a touch method, and an electronic device.
Background
The touch technology is realized by adopting a human-computer interaction technology and hardware equipment together, and can realize the human-computer interaction operation of the electronic equipment in a touch mode without traditional input equipment (such as a mouse, a keyboard and the like).
In the prior art, when touched, a touch device may determine a touch position according to a corresponding detection signal, and may generate a touch instruction based on the detection signal. However, the touch device generally cannot determine whether the currently detected touch signal is a touch signal generated by a false touch, so that the conventional touch device cannot solve the problem of the false touch.
Disclosure of Invention
In view of the above, an objective of the present invention is to provide a touch device, a manufacturing method thereof, a touch method and an electronic apparatus, so as to solve the above problems.
In view of the above, an embodiment of the present invention provides a touch device, including:
a pressure detection unit configured to detect a touch pressure applied on the touch device;
a touch detection unit configured to detect a touch signal applied to the touch device;
a control unit configured to generate a touch instruction according to the touch signal in response to the touch pressure being within a pressure threshold range.
Optionally, the touch device is a touch key.
Optionally, the control unit is configured to control the touch detection unit to detect a touch signal applied on the touch device in response to the touch pressure being within a pressure threshold range.
Optionally, the touch detection unit includes a touch electrode layer, an insulating layer, and a routing layer, which are sequentially disposed; and the electrodes in the touch electrode layer are correspondingly connected with the signal wires in the wire routing layer.
Optionally, the touch electrode layer includes a first electrode and a second electrode, and the routing layer includes a first signal routing and a second signal routing; the first electrode is electrically connected with the first signal wire through a first via hole, and the second electrode is electrically connected with the second signal wire through a second via hole.
Optionally, the number of the first electrodes is multiple, and the first electrodes are arranged in a straight line or an array at equal intervals; the second electrode is circumferentially disposed around the first electrode.
Optionally, the routing layer further includes a shielding trace, and the shielding trace is disposed around the signal trace.
Optionally, the pressure detection unit comprises a piezoelectric material layer; and the piezoelectric material units in the piezoelectric material layer are correspondingly connected with the electrodes in the touch electrode layer.
An embodiment of the present invention provides an electronic device, including the touch device as described above.
An embodiment of the present invention provides a touch method, including:
receiving touch pressure applied to the touch device and detected by a pressure detection unit;
receiving a touch signal applied to the touch device and detected by a touch detection unit;
and responding to the touch pressure within the pressure threshold range, and generating a touch instruction by the control unit according to the touch signal.
Optionally, receiving a touch signal applied to the touch device detected by a touch detection unit includes:
and receiving a touch signal applied on the touch device detected by a touch detection unit in response to the touch pressure being within a pressure threshold range.
The embodiment of the invention provides a manufacturing method of a touch device, which comprises the following steps:
obtaining a substrate base plate;
forming a wiring layer on the substrate base plate;
forming an insulating layer on the routing layer;
forming a touch electrode layer on the insulating layer; electrodes in the touch electrode layer are correspondingly connected with signal wires in the wire routing layer;
forming a piezoelectric material layer on the touch electrode layer; and the piezoelectric material units in the piezoelectric material layer are correspondingly connected with the electrodes in the touch electrode layer.
As can be seen from the foregoing, in the touch device, the manufacturing method thereof, the touch method and the electronic device provided in the embodiments of the present invention, the pressure detection unit detects the touch pressure, and when the touch pressure is within the pressure threshold range, the control unit generates the corresponding touch instruction according to the touch signal, so that when the touch pressure meets the requirement, the touch instruction is generated based on the touch signal, thereby avoiding the problem of erroneous touch and improving the touch operation efficiency. Therefore, the touch device provided by the embodiment of the invention adopts 3D pressure-sensitive touch, and can effectively avoid mistaken touch in the using process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a touch device according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a touch device according to an embodiment of the invention;
FIG. 3 is a schematic top view of a touch electrode layer and a piezoelectric material layer according to an embodiment of the invention;
FIG. 4 is a schematic top view of a routing layer according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a touch method of a touch device according to an embodiment of the invention;
fig. 6 is a flowchart illustrating a method for manufacturing a touch device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1 shows a schematic structural diagram of a touch device according to an embodiment of the present invention.
As shown in fig. 1, the touch device includes:
a pressure detection unit 10 configured to detect a touch pressure applied on the touch device;
a touch detection unit 20 configured to detect a touch signal applied to the touch device;
a control unit 30 configured to generate a touch instruction according to the touch signal in response to the touch pressure being within a pressure threshold range.
As can be seen from the foregoing embodiments, in the touch device provided in the embodiments of the present invention, the pressure detection unit detects the touch pressure, and when the touch pressure is within the pressure threshold range, the control unit generates the corresponding touch instruction according to the touch signal, so that when the touch pressure meets the requirement, the touch instruction is generated based on the touch signal, thereby avoiding the problem of erroneous touch and improving the touch operation efficiency. Therefore, the touch device provided by the embodiment of the invention adopts 3D pressure-sensitive touch, and can effectively avoid mistaken touch in the using process.
Optionally, based on the determination criteria of the different touch products on the false touch, the pressure threshold range may be set according to actual needs, and is not specifically limited herein.
The existing mechanical keys are all designed in an outward convex mode, the attractiveness of products is influenced to a certain extent, and especially the existing mobile phones tend to cancel the design of side keys. Therefore, in one or more embodiments of the present invention, the touch device is a touch key. For example, the touch device is used for replacing mechanical keys on electronic equipment such as a mobile phone, a tablet computer and a personal computer.
Because the mechanical key has the characteristic of effectively preventing mistaken touch, if the mechanical key is changed into a touch structure, the mechanical key does not have the function of touch operation after the screen is unlocked like a touch screen, but can be pressed to send a corresponding instruction without unlocking or awakening, and therefore, for the condition that the mechanical key is replaced by the touch device, the touch device provided by the embodiment of the invention can effectively prevent mistaken touch because the touch pressure needs to be judged to meet the requirement, and is more suitable for replacing the mechanical key.
In one or more embodiments of the present invention, the control unit 30 is configured to control the touch detection unit 20 to detect the touch signal applied to the touch device in response to the touch pressure being within the pressure threshold range. That is, whether the touch pressure is in the pressure threshold range is detected, and when the touch pressure meets the requirement, the touch signal is detected, so that the touch pressure detection and the touch signal detection can be completed in a time-sharing manner, and some circuits can be shared in design, thereby achieving the effect of simplifying the circuit structure.
In one or more embodiments of the present invention, referring to fig. 2, the touch detection unit 20 includes a touch electrode layer 21, an insulating layer 22, and a routing layer 23 sequentially disposed; the electrodes 211/212 in the touch electrode layer 21 are correspondingly connected to the signal traces 231/232 (refer to fig. 4) in the trace layer 23. Alternatively, the above-described hierarchical structure may be provided on the base substrate 24. Alternatively, the base substrate 24 may be made of PET base material.
Optionally, referring to fig. 2 to 4, in one or more embodiments of the present invention, the touch electrode layer 21 includes a first electrode 211 and a second electrode 212, and the routing layer 23 includes a first signal routing 231 and a second signal routing 232; the first electrode 211 is electrically connected to the first signal trace 231 through the first via 221, and the second electrode 212 is electrically connected to the second signal trace 232 through the second via 222.
In addition, as shown in fig. 4, the routing layer 23 further includes a bonding area 235, and the first signal trace 231 and the second signal trace 232 are both connected to the bonding area 235 to transmit the electrical signal to an external circuit (e.g., an IC) for the control unit 30 to process and analyze the electrical signal.
In one or more embodiments of the present invention, the number of the first electrodes 211 is multiple, and the first electrodes are arranged in a straight line (shown in fig. 3) or in an array (not shown) at equal intervals; the second electrode 212 is disposed around the first electrode 211, so that the first electrode 211 and the second electrode 212 can be fabricated in the same layer, thereby saving the process. For example, as shown in fig. 3, the first electrode 211 is a block design, the second electrode 212 is a full channel design, the first electrode 211 is wrapped by the second electrode 212, a gap exists between the first electrode 211 and the second electrode 212, and the finger touch signal is detected by detecting a capacitance change between the first electrode 211 and the second electrode 212. In the embodiment, the square first electrodes 211 are independent from each other, so that multi-touch is supported.
In one or more embodiments of the present invention, as shown in fig. 4, the routing layer 23 further includes a shielding routing 233, where the shielding routing 233 is disposed around the signal routing 231/232 for shielding signal interference between the signal routing and the touch electrode layer 21. Optionally, the shielding trace 233 is connected to the ground pin of the bonding region 235 through the third signal trace 234, so that the shielding trace 233 is grounded, and the signal shielding effect can be better achieved.
In one or more embodiments of the present invention, as shown in fig. 2, the pressure detecting unit 10 includes a piezoelectric material layer 11; the piezoelectric material units 111 in the piezoelectric material layer 11 are correspondingly connected with the electrodes 211/212 in the touch electrode layer 21. In this way, the piezoelectric material unit 111 can be electrically connected to the signal trace 231/232 in the trace layer 23 via the electrode 211/212 in the touch electrode layer 21, so that the piezoelectric material unit 111 and the electrode 211/212 can share the signal trace 231/232, and the signal trace does not need to be separately disposed for the piezoelectric material unit 111, thereby simplifying the overall structure and saving the manufacturing process. On the basis, the touch pressure and the touch signal are detected in a time-sharing manner, so that the function of the touch device in the embodiment of the invention can be realized by utilizing the structure.
Based on the formula: U-Q/Cp＝(d33×T×h)/(r×0)，d33Is the piezoelectric coefficient of the piezoelectric material unit, T is the touch pressure, h is the thickness of the piezoelectric material unit,ris the relative dielectric constant of the piezoelectric material element,0is the vacuum dielectric constant of the piezoelectric material unit. In the fixed lamination, the voltage U and the touch pressure T are in a linear relationship, so that an effective touch pressure (i.e., an effective activation voltage) can be defined, and false touch in the using process can be effectively avoided.
Optionally, referring to fig. 2 to 4, the piezoelectric material unit 111 is correspondingly connected to the first electrode 211 and the second electrode 212, so as to be electrically connected to the first signal trace 231 and the second signal trace 232 in the trace layer 23.
Optionally, the number of the piezoelectric material units 111 is multiple, and the units are arranged in a straight line (shown in fig. 3) or in an array (not shown) at equal intervals; thus, the piezoelectric material units 111 and the first electrodes 211 can be connected in a one-to-one correspondence manner, so that one first electrode correspondingly collects an electric signal generated by one piezoelectric material unit 111 due to pressure.
Optionally, as shown in fig. 2, the pressure detecting unit 10 further includes a second insulating layer 12, where the second insulating layer 12 surrounds the piezoelectric material unit 111 for electrically insulating the piezoelectric material unit 111 from other components.
The touch device with the laminated structure in the embodiment adopts an embedded touch control mode (in-cell) without an outward convex key, so that the product is attractive. Meanwhile, when the substrate 24 is a flexible substrate, the touch device has the characteristics of being bendable, cutting in a special shape and the like, and is wide in use and application scenes.
One or more embodiments of the present invention also provide an electronic device. The electronic device comprises any embodiment or arrangement and combination of embodiments of the touch device.
It should be noted that the electronic device in this embodiment may be: any product or component with keys, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like. The touch device is a touch key in the electronic equipment.
In the electronic device provided by one or more embodiments of the present invention, the touch device adopts an embedded touch design, so that a mechanical touch 3D pressure-sensitive touch effect is maintained while a side-key-free design is realized, a touch error can be effectively avoided, and the touch device is integrated on the side to maintain an aesthetic feeling. Optionally, when the touch device adopts a flexible substrate, the touch device can be bent, so that the touch device can be applied to various occasions such as televisions, refrigerators, notebooks, elevators and the like.
One or more embodiments of the present invention also provide a touch method. Fig. 5 is a flowchart illustrating a touch method of a touch device according to an embodiment of the present invention.
As shown in fig. 5, the touch method includes:
step 402: and receiving the touch pressure applied to the touch device detected by the pressure detection unit.
Alternatively, the detection of the touch pressure may be realized by using a piezoelectric material.
Step 404: and receiving a touch signal applied to the touch device and detected by a touch detection unit.
Alternatively, the touch pressure detection may be implemented by using a touch structure formed by the first electrode 211 and the second electrode 212.
Step 406: and responding to the touch pressure within the pressure threshold range, and generating a touch instruction by the control unit according to the touch signal.
As can be seen from the foregoing embodiments, in the touch method provided in the embodiments of the present invention, the pressure detection unit detects the touch pressure, and when the touch pressure is within the pressure threshold range, the control unit generates the corresponding touch instruction according to the touch signal, so that when the touch pressure meets the requirement, the touch instruction is generated based on the touch signal, thereby avoiding the problem of erroneous touch and improving the touch operation efficiency. Therefore, the touch method provided by the embodiment of the invention adopts 3D pressure-sensitive touch, and can effectively avoid mistaken touch in the using process.
In one or more embodiments of the present invention, receiving a touch signal applied to the touch device detected by a touch detection unit includes:
and receiving a touch signal applied on the touch device detected by a touch detection unit in response to the touch pressure being within a pressure threshold range.
That is, whether the touch pressure is in the pressure threshold range is detected, and when the touch pressure meets the requirement, the touch signal is detected, so that the touch pressure detection and the touch signal detection can be completed in a time-sharing manner, and some circuits can be shared in design, thereby achieving the effect of simplifying the circuit structure.
In one or more embodiments of the present invention, the implementation of the touch method is: when a finger presses the surface of the touch device, the pressure detection unit generates a pressure-applying voltage, the pressure-applying voltage is input into the control unit, when a certain pressure threshold is reached, a corresponding channel in the control unit is activated, meanwhile, the capacitance between the first electrode 211 and the second electrode 212 at a corresponding position changes when the finger touches, and the control unit responds to the capacitance change to realize the touch key function.
One or more embodiments of the present invention also provide a method for manufacturing a touch device. Fig. 6 is a flowchart illustrating a method for manufacturing a touch device according to an embodiment of the invention.
As shown in fig. 6, the method for manufacturing a touch device includes:
step 502: obtaining a substrate base plate; alternatively, the base substrate may be a flexible base, for example, a base manufactured using a PET base material.
Step 504: forming a wiring layer on the substrate base plate;
step 506: forming an insulating layer on the routing layer;
step 508: forming a touch electrode layer on the insulating layer; electrodes in the touch electrode layer are correspondingly connected with signal wires in the wire routing layer;
step 510: forming a piezoelectric material layer on the touch electrode layer; and the piezoelectric material units in the piezoelectric material layer are correspondingly connected with the electrodes in the touch electrode layer.
As can be seen from the foregoing embodiments, in the touch device manufactured by the method for manufacturing a touch device according to the embodiments of the present invention, the pressure detection unit detects the touch pressure, and when the touch pressure is within the pressure threshold range, the control unit generates the corresponding touch instruction according to the touch signal, so that when the touch pressure meets the requirement, the touch instruction is generated based on the touch signal, thereby avoiding the problem of erroneous touch and improving the touch operation efficiency. Therefore, the touch method provided by the embodiment of the invention adopts 3D pressure-sensitive touch, and can effectively avoid mistaken touch in the using process.
It should be noted that the operations of forming the layers include, but are not limited to (chemical phase, physical phase) deposition film formation, (magnetron) sputtering film formation, and those skilled in the art can understand that after each layer is formed, a corresponding pattern can be further formed thereon as required, and the description of the present invention is omitted here.
It is noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element or layer or intervening layers may also be present. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element or intervening layers or elements may also be present. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it can be the only layer between the two layers or elements, or there can be more than one intermediate layer or element. Like reference numerals refer to like elements throughout.
Those of ordinary skill in the art will understand that: the invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.
Claims (12)
1. A touch device, comprising:
a pressure detection unit configured to detect a touch pressure applied on the touch device;
a touch detection unit configured to detect a touch signal applied to the touch device;
a control unit configured to generate a touch instruction according to the touch signal in response to the touch pressure being within a pressure threshold range.
2. The touch device of claim 1, wherein the touch device is a touch button.
3. The touch device of claim 1, wherein the control unit is configured to control the touch detection unit to detect a touch signal applied on the touch device in response to the touch pressure being within a pressure threshold range.
4. The touch device according to claim 3, wherein the touch detection unit includes a touch electrode layer, an insulating layer, and a wiring layer, which are sequentially disposed; and the electrodes in the touch electrode layer are correspondingly connected with the signal wires in the wire routing layer.
5. The touch device of claim 4, wherein the touch electrode layer comprises a first electrode and a second electrode, and the routing layer comprises a first signal routing and a second signal routing; the first electrode is electrically connected with the first signal wire through a first via hole, and the second electrode is electrically connected with the second signal wire through a second via hole.
6. The touch device of claim 5, wherein the number of the first electrodes is multiple, and the first electrodes are arranged linearly or in an array at equal intervals; the second electrode is circumferentially disposed around the first electrode.
7. The touch device of claim 4, wherein the trace layer further comprises a shield trace disposed around the signal trace.
8. The touch device according to claim 4, wherein the pressure detection unit includes a piezoelectric material layer; and the piezoelectric material units in the piezoelectric material layer are correspondingly connected with the electrodes in the touch electrode layer.
9. An electronic device comprising the touch device of any one of claims 1-8.
10. A touch method, comprising:
receiving touch pressure applied to the touch device and detected by a pressure detection unit;
receiving a touch signal applied to the touch device and detected by a touch detection unit;
and responding to the touch pressure within the pressure threshold range, and generating a touch instruction by the control unit according to the touch signal.
11. The touch method of claim 10, wherein receiving the touch signal applied to the touch device detected by the touch detection unit comprises:
and receiving a touch signal applied on the touch device detected by a touch detection unit in response to the touch pressure being within a pressure threshold range.
12. A method for manufacturing a touch device includes:
obtaining a substrate base plate;
forming a wiring layer on the substrate base plate;
forming an insulating layer on the routing layer;
forming a touch electrode layer on the insulating layer; electrodes in the touch electrode layer are correspondingly connected with signal wires in the wire routing layer;
forming a piezoelectric material layer on the touch electrode layer; and the piezoelectric material units in the piezoelectric material layer are correspondingly connected with the electrodes in the touch electrode layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010518505.2A CN111665989A (en) | 2020-06-09 | 2020-06-09 | Touch device, manufacturing method thereof, touch method and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010518505.2A CN111665989A (en) | 2020-06-09 | 2020-06-09 | Touch device, manufacturing method thereof, touch method and electronic equipment |
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| CN111665989A true CN111665989A (en) | 2020-09-15 |
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| CN113268163B (en) * | 2021-06-08 | 2024-03-15 | 京东方科技集团股份有限公司 | Touch display screen, electronic equipment and touch panel error touch prevention method |
| CN116243815A (en) * | 2023-05-10 | 2023-06-09 | 惠科股份有限公司 | Touch panel, display module, display device and touch detection method |
| CN116243815B (en) * | 2023-05-10 | 2023-08-08 | 惠科股份有限公司 | Touch panel, display module, display device and touch detection method |
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