阅读说明：本技术 一种超声传感器 (Ultrasonic sensor ) 是由 马春鹏 于 2020-12-25 设计创作，主要内容包括：本发明公开了一种超声传感器,包括探头和晶片,所述晶片固定连接在探头的内侧,所述探头的内侧固定连接有挡板,所述晶片与挡板相抵,所述探头的内侧滑动连接有用于防止挡板发生形变的固定板,所述固定板通过连接杆固定连接在挡板上,所述探头的内侧设有用于用于固定板滑动的导向组件,所述探头的内侧设有用于减少挡板形变的弹性组件,所述探头的内侧设有清灰组件,所述探头的内侧设有通风组件。本发明设计合理,通过设置弹性组件,在压缩弹簧的弹性作用下,达到减少挡板形变量的目的,从而避免车辆行驶时,挡板发生形变后对晶片造成损伤。(The invention discloses an ultrasonic sensor which comprises a probe and a wafer, wherein the wafer is fixedly connected to the inner side of the probe, a baffle is fixedly connected to the inner side of the probe, the wafer abuts against the baffle, a fixing plate used for preventing the baffle from deforming is connected to the inner side of the probe in a sliding mode, the fixing plate is fixedly connected to the baffle through a connecting rod, a guide assembly used for enabling the fixing plate to slide is arranged on the inner side of the probe, an elastic assembly used for reducing the deformation of the baffle is arranged on the inner side of the probe, an ash removal assembly is arranged on the inner side of the probe, and a ventilation assembly is arranged on the inner side of. The wafer baffle is reasonable in design, and the elastic component is arranged, so that the purpose of reducing the deformation of the baffle is achieved under the elastic action of the compression spring, and the wafer is prevented from being damaged after the baffle deforms when a vehicle runs.)

1. The utility model provides an ultrasonic sensor, includes probe (1) and wafer (2), its characterized in that, wafer (2) fixed connection is in the inboard of probe (1), inboard fixedly connected with baffle (3) of probe (1), wafer (2) offset with baffle (3), the inboard sliding connection of probe (1) has fixed plate (5) that are used for preventing baffle (3) to take place deformation, fixed plate (5) are through connecting rod (6) fixed connection on baffle (3), the inboard of probe (1) is equipped with and is used for being used for fixed plate (5) gliding direction subassembly, the inboard of probe (1) is equipped with the elastic component who is used for reducing baffle (3) deformation, the inboard of probe (1) is equipped with the deashing subassembly, the inboard of probe (1) is equipped with the ventilation subassembly.

2. The ultrasonic transducer according to claim 1, wherein the guide assembly comprises two guide grooves symmetrically arranged at the inner sides of the probe (1), the fixing rods (4) are fixedly connected at the inner sides of the two guide grooves, and the fixing plate (5) is slidably connected on the two fixing rods (4).

3. The ultrasonic transducer according to claim 1, wherein the elastic component comprises a support rod (8) fixedly connected to the inner side of the probe (1), two sliding blocks (9) are symmetrically and slidably connected to the support rod (8), the two sliding blocks (9) are respectively and elastically connected to the inner side of the probe (1) through compression springs (10), and a connecting component is arranged between the two sliding blocks (9) and the fixed plate (5).

4. The ultrasonic transducer according to claim 3, wherein the connecting assembly comprises a fixed block (7) fixedly connected to one side of the fixed plate (5) far away from the connecting rod (6), two guide posts (12) are symmetrically arranged on each of the two sliding blocks (9), transmission rods (11) are rotatably connected to each of the four guide posts (12), and each of the four transmission rods (11) is rotatably connected to the fixed block (7).

5. The ultrasonic sensor according to claim 2, wherein the ash removal assembly comprises four mounting blocks (16) fixedly connected to the inner side of the probe (1), wherein a ball screw (17) is connected between two vertical mounting blocks (16) in a rotating manner, a guide rod (29) is connected between the other two mounting blocks (16) in a rotating manner, a brush plate (18) is sleeved on the ball screw (17) and the guide rod (29), one side of the brush plate (18) close to the wafer (2) is provided with bristles (19), and a rotating assembly is arranged between the ball screw (17) and the fixing plate (5).

6. The ultrasonic sensor according to claim 5, wherein the rotating assembly comprises two fixed cylinders (13) respectively sleeved on two fixed rods (4), the right sides of the two fixed cylinders (13) are both fixedly connected to the fixed plate (5), one of the fixed cylinders (13) is rotatably connected with a plurality of racks (27) at equal intervals, a plurality of stoppers (28) used for limiting the racks (27) are arranged on the fixed cylinder (13), the stoppers (28) are both positioned on the right sides of the racks (27), the ball screw (17) penetrates through the mounting block (16) and is fixedly connected with a transmission gear (26), and the transmission gear (26) and the racks (27) are meshed with each other.

7. The ultrasonic sensor according to claim 1, wherein the ventilation assembly comprises a small motor (20) fixedly connected to the outer side of the probe (1), the end of the output shaft of the small motor (20) penetrates through the outer side of the probe (1) and is fixedly connected with a first rotating shaft, a plurality of heat dissipation holes (25) are formed in the side wall of the probe (1) at equal intervals, a plurality of fan blades (21) are fixedly connected to the rotating shaft, a second rotating shaft is rotatably connected to the inner side of the probe (1), a plurality of rectangular plates (24) are symmetrically arranged on the second rotating shaft, and a transmission assembly is arranged between the first rotating shaft and the second rotating shaft.

8. An ultrasonic transducer according to claim 7, wherein the transmission assembly comprises a first bevel gear (22) fixedly connected to an end of the first rotary shaft away from the small motor (20), and a second bevel gear (23) is sleeved on the second rotary shaft, and the first bevel gear (22) and the second bevel gear (23) are engaged with each other.

9. An ultrasonic sensor according to claim 1, wherein the ends of the two fixed cylinders (13) far away from the fixed plate (5) are fixedly connected with a trigger block (14), and the inner sides of the two guide grooves are fixedly connected with a receiving block (15).

10. An alarm system for an ultrasonic sensor according to claim 9, comprising:

the detection module is the trigger block (14) and the receiving block (15) which are positioned in the same horizontal direction, one surfaces, opposite to the trigger block (14) and the receiving block (15), of the trigger block (14) are made of metal materials, when the trigger block (14) is pressed, the trigger block is abutted against the receiving block (15), so that the whole loop is in a power-on state, and the damaged state of the wafer (2) is transmitted to the electroacoustic unit in an electric signal mode;

the electroacoustic unit comprises a loudspeaker and a warning lamp, and the loudspeaker is preset with a pilot frequency or an alarm frequency;

the circuit switch, circuit switch is for alarm system disconnection usefulness, works as loudspeaker and warning light are lasted to send out behind the police dispatch newspaper by the people and are found, through the drive circuit switch can prevent that loudspeaker and warning light from lastingly forming the interference to the people.

Technical Field

The invention relates to the technical field of electronic components, in particular to an ultrasonic sensor.

Background

The ultrasonic probe is a device for transmitting and receiving ultrasonic waves in the ultrasonic detection process, the performance of the probe directly influences the characteristics of the ultrasonic waves and influences the detection performance of the ultrasonic waves, the probe used in the ultrasonic detection is a transducer for converting electric energy and sound energy by utilizing the piezoelectric effect of materials, the key component in the probe is a wafer, and the wafer is a single crystal or multi-wafer sheet with the piezoelectric effect and has the function of mutually converting the electric energy and the sound energy.

The locomotive loading of part vehicle is used for surveying the ultrasonic probe of barrier distance, and the vehicle is gone, the baffle of the front end of probe is buckled easily under the effect of windage, because the wafer is more fragile, can cause the damage to the wafer when the baffle takes place to buckle, and the vehicle is gone in-process dust can often pass through the gap entering probe, if the clearance often can form the one deck deposition on the surface of wafer not, thereby influence the normal use of wafer, need often ventilate in the probe simultaneously, so that prevent the inside high temperature of probe and make the condition that part appears ageing.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an ultrasonic sensor.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an ultrasonic sensor, includes probe and wafer, wafer fixed connection is in the inboard of probe, the inboard fixedly connected with baffle of probe, the wafer offsets with the baffle, the inboard sliding connection of probe has the fixed plate that is used for preventing the baffle from taking place deformation, the fixed plate passes through connecting rod fixed connection on the baffle, the inboard of probe is equipped with and is used for being used for the gliding direction subassembly of fixed plate, the inboard of probe is equipped with and is used for reducing the elastic component of baffle deformation, the inboard of probe is equipped with the deashing subassembly, the inboard of probe is equipped with the ventilation subassembly.

Preferably, the guide assembly comprises two guide grooves symmetrically arranged on the inner side of the probe, the inner sides of the two guide grooves are fixedly connected with fixing rods, and the fixing plates are connected to the two fixing rods in a sliding mode.

Preferably, elastic component includes the bracing piece of fixed connection in the probe inboard, symmetrical sliding connection has two sliders on the bracing piece, two the slider is respectively through compression spring elastic connection in the inboard of probe, two be equipped with coupling assembling between slider and the fixed plate.

Preferably, the connecting assembly comprises a fixed block fixedly connected to one side, far away from the connecting rod, of the fixed plate, two guide posts are symmetrically arranged on the two sliding blocks, four guide posts are rotatably connected with transmission rods, and the four transmission rods are rotatably connected to the fixed block.

Preferably, the ash removal component comprises four mounting blocks fixedly connected to the inner side of the probe, wherein a ball screw is connected between the mounting blocks in the two vertical directions in a rotating mode, a guide rod is fixedly connected between the other two mounting blocks in a rotating mode, a brush plate is sleeved on the ball screw and the guide rod in a rotating mode, bristles are arranged on one side, close to the wafer, of the brush plate, and a rotating component is arranged between the ball screw and the fixing plate.

Preferably, the rotating assembly comprises two fixed cylinders which are respectively sleeved on the two fixed rods, the two fixed cylinders are fixedly connected to the fixed plates on the right sides of the fixed cylinders, one of the fixed cylinders is connected with a plurality of racks in an equidistant rotating mode, a plurality of stop blocks used for limiting the racks are arranged on the fixed cylinders, the stop blocks are all located on the right sides of the racks, the ball screw penetrates through the installation block and is fixedly connected with the transmission gear, and the transmission gear is meshed with the racks.

Preferably, the ventilation subassembly includes the small-size motor of fixed connection in the probe outside, the output shaft end of small-size motor runs through the outside and the first pivot of fixedly connected with of probe, equidistant a plurality of louvres that are equipped with on the lateral wall of probe, a plurality of fan blades of fixedly connected with in the pivot, the inboard rotation of probe is connected with the second pivot, the symmetry is equipped with a plurality of rectangular plates in the second pivot, be equipped with transmission assembly between first pivot and the second pivot.

Preferably, the transmission assembly comprises a first bevel gear fixedly connected to one end, far away from the small motor, of the first rotating shaft, a second bevel gear is sleeved on the second rotating shaft, and the first bevel gear and the second bevel gear are meshed with each other.

Preferably, two the equal fixedly connected with of one end that the fixed plate was kept away from to the solid fixed cylinder triggers the piece, two the equal fixedly connected with in inboard of guide way receives the piece.

Preferably, the method comprises the following steps:

the detection module is the trigger block and the receiving block which are positioned in the same horizontal direction, one surfaces of the trigger block, which are opposite to the receiving block, are made of metal materials, and the trigger block is abutted against the receiving block after being pressed, so that the whole loop is in a power-on state, and the damaged state of the wafer is transmitted to the electroacoustic unit in the form of an electric signal;

the electroacoustic unit comprises a loudspeaker and a warning lamp, and the loudspeaker is preset with a pilot frequency or an alarm frequency;

the circuit switch, circuit switch is for alarm system disconnection usefulness, works as loudspeaker and warning light are lasted to send out behind the police dispatch newspaper by the people and are found, through the drive circuit switch can prevent that loudspeaker and warning light from lastingly forming the interference to the people.

Compared with the prior art, the invention has the beneficial effects that:

1. by arranging the elastic assembly, when the baffle is bent, the plate is arranged at the middle part of the baffle to the maximum extent, the baffle drives the fixed plate to move through the connecting rod, the fixed plate drives the sliding block to move through the fixed block and the supporting rod, and the sliding block is elastically connected with the inner wall of the probe through the compression spring, so that the aim of preventing the sliding block from continuously moving is fulfilled, the baffle is prevented from deforming, and the baffle at the front end of the probe is prevented from being bent under the action of wind resistance to damage a wafer;

2. by arranging the ash removal component, the fixed plate can drive the fixed cylinder to move leftwards when deformed every time, the fixed plate drives the fixed cylinder to move, the fixed cylinder drives the rack to move, the rack moves to drive the transmission gear to rotate, the transmission gear rotates to drive the ball screw to rotate, and the ball screw rotates to drive the brush plate and the brush bristles to sweep the surface of the wafer, so that the ash removal purpose is achieved, dust is prevented from entering the probe through a gap frequently in the driving process of a vehicle, and a layer of accumulated ash can be formed on the surface of the wafer if the dust is not cleaned frequently, so that the normal use of the wafer is influenced;

3. through setting up the ventilation unit, the small-size motor rotates and drives first pivot and rotate, first pivot is rotated and is driven the fan blade and rotate, the fan blade rotates and makes air flow rate accelerate, spread steam from the louvre, thereby prevent that the inside high temperature of probe and make the ageing condition appear in some parts, the second pivot takes place to rotate under the transmission of first bevel gear and second bevel gear simultaneously, the rectangular plate is under the rotation of second pivot, change the wind direction at the uniform velocity, make the heat dissipation more even.

Drawings

Fig. 1 is a schematic front structural diagram of an ultrasonic sensor according to the present invention;

FIG. 2 is a schematic view of a partial top view of an ultrasonic sensor according to the present invention;

fig. 3 is a schematic side view of an ultrasonic sensor according to the present invention;

FIG. 4 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 5 is a schematic diagram of an alarm system according to the present invention.

In the figure: 1 probe, 2 wafers, 3 baffles, 4 fixing rods, 5 fixing plates, 6 connecting rods, 7 fixing blocks, 8 supporting rods, 9 sliding blocks, 10 compression springs, 11 transmission rods, 12 guide pillars, 13 fixing cylinders, 14 triggering blocks, 15 receiving blocks, 16 mounting blocks, 17 ball screws, 18 brush plates, 19 bristles, 20 small motors, 21 fan blades, 22 first bevel gears, 23 second bevel gears, 24 rectangular plates, 25 heat dissipation holes, 26 transmission gears, 27 racks, 28 stoppers and 29 guide rods.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1-4, an ultrasonic sensor comprises a probe 1 and a wafer 2, the wafer 2 is fixedly connected to the inner side of the probe 1, the inner side of the probe 1 is fixedly connected with a baffle 3, the wafer 2 is abutted to the baffle 3, the inner side of the probe 1 is slidably connected with a fixing plate 5 for preventing the baffle 3 from deforming, the fixing plate 5 is fixedly connected to the baffle 3 through a connecting rod 6, the inner side of the probe 1 is provided with a guide assembly for sliding the fixing plate 5, the inner side of the probe 1 is provided with an elastic assembly for reducing the deformation of the baffle 3, the inner side of the probe 1 is provided with an ash removal assembly, and the inner side of the probe 1.

The guide assembly comprises two guide grooves symmetrically arranged on the inner side of the probe 1, fixing rods 4 are fixedly connected to the inner sides of the two guide grooves, and the fixing plates 5 are connected to the two fixing rods 4 in a sliding mode.

Elastic component includes the bracing piece 8 of fixed connection at 1 inboard of probe, symmetrical sliding connection has two sliders 9 on the bracing piece 8, two sliders 9 are respectively through compression spring 10 elastic connection in the inboard of probe 1, be equipped with coupling assembling between two sliders 9 and the fixed plate 5, when baffle 3 takes place to buckle, the middle part position shaped plate degree of baffle 3 is the biggest, baffle 3 drives fixed plate 5 motion through connecting rod 6, fixed plate 5 drives slider 9 motion through fixed block 7 and bracing piece 8, because through compression spring 10 elastic connection between the inner wall of slider 9 and probe 1, can reach the purpose that prevents slider 9 to continue the motion, thereby prevent that baffle 3 to take place deformation, avoid baffle 3 of probe 1 front end to buckle under the effect of windage, cause the damage to wafer 2.

Coupling assembling includes fixed connection and keeps away from fixed block 7 of connecting rod 6 one side at fixed plate 5, and two sliders 9 are gone up all the symmetry and are equipped with two guide pillars 12, all rotate on four guide pillars 12 and are connected with transfer line 11, and four transfer lines 11 all rotate and connect on fixed block 7.

The ash cleaning component comprises four mounting blocks 16 fixedly connected to the inner side of the probe 1, wherein a ball screw 17 is connected between two mounting blocks 16 in the vertical direction in a rotating mode, a guide rod 29 is fixedly connected between the other two mounting blocks 16 in a rotating mode, a brush plate 18 is sleeved on the ball screw 17 and the guide rod 29 in a rotating mode, brush bristles 19 are arranged on one side, close to the wafer 2, of the brush plate 18, a rotating component is arranged between the ball screw 17 and the fixing plate 5, the fixing plate 5 can drive the fixing cylinder 13 to move leftwards when the fixing plate 5 deforms, the fixing cylinder 13 drives the rack 27 to move, the rack 27 moves to drive the transmission gear 26 to rotate, the transmission gear 26 rotates to drive the ball screw 17 to rotate, the ball screw 17 rotates to drive the brush plate 18 and the brush bristles 19 to sweep the surface of the wafer 2, the ash cleaning purpose is achieved, and dust is prevented from, a layer of ash can form on the surface of the wafer 2 if not cleaned often, thereby interfering with the proper use of the wafer 2.

The rotating assembly comprises two fixed cylinders 13 which are respectively sleeved on the two fixed rods 4, the right sides of the two fixed cylinders 13 are fixedly connected to the fixed plate 5, one of the fixed cylinders 13 is connected with a plurality of racks 27 in an equidistant rotating mode, a plurality of stop blocks 28 used for limiting the racks 27 are arranged on the fixed cylinders 13, the stop blocks 28 are all located on the right sides of the racks 27, the stop blocks 28 limit the racks 27 to rotate rightwards, the purpose of one-way rotation of the transmission gear 26 is achieved, the influence of the racks 27 during returning to the original position is avoided, the ball screw 17 penetrates through the mounting block 16 and the transmission gear 26, and the transmission gear 26 is meshed with the racks 27.

The ventilation assembly comprises a small motor 20 fixedly connected to the outer side of the probe 1, the tail end of an output shaft of the small motor 20 penetrates through the outer side of the probe 1 and is fixedly connected with a first rotating shaft, a plurality of heat dissipation holes 25 are arranged on the side wall of the probe 1 at equal intervals, a plurality of fan blades 21 are fixedly connected to the rotating shaft, the inner side of the probe 1 is rotatably connected with a second rotating shaft, a plurality of rectangular plates 24 are symmetrically arranged on the second rotating shaft, a transmission assembly is arranged between the first rotating shaft and the second rotating shaft, the small motor 20 rotates to drive the first rotating shaft to rotate, the first rotating shaft rotates to drive the fan blades 21 to rotate, the air flow rate is accelerated by the rotation of the fan blades 21, hot air is transmitted out from the heat dissipation holes 25, so that the condition that part of parts are aged due to overhigh internal temperature of the probe 1 is prevented, meanwhile, the second rotating shaft rotates, the wind direction is changed at a constant speed, so that the heat dissipation is more uniform.

The transmission assembly comprises a first bevel gear 22 fixedly connected to one end, far away from the small motor 20, of a first rotating shaft, a second bevel gear 23 is sleeved on a second rotating shaft, and the first bevel gear 22 and the second bevel gear 23 are meshed with each other.

The equal fixedly connected with of one end that fixed plate 5 was kept away from to two solid fixed cylinder 13 triggers piece 14, the equal fixedly connected with in inboard of two guide ways receives piece 15, when the speed of a motor vehicle of car is very fast, the deformation volume of baffle 3 is very big to the probability of wafer 2 harm has been increased, baffle 3 passes through connecting rod 6 this moment, fixed plate 5 and solid fixed cylinder 13 drive trigger piece 14 and moves to and receive piece 15 counterbalance, trigger piece 14 can send out the police dispatch newspaper when piece 15 counterbalance with receiving.

The method comprises the following steps:

the detection module is a trigger block 14 and a receiving block 15 which are positioned on the same horizontal direction, one surface of the trigger block 14 opposite to the receiving block 15 is made of metal, and the trigger block 14 is pressed and then butts against the receiving block 15, so that the whole loop is in a power-on state, and the damaged state of the wafer 2 is transmitted to the electroacoustic unit in the form of an electric signal;

the electroacoustic unit comprises a loudspeaker and a warning lamp, and the loudspeaker is preset with a pilot frequency or an alarm frequency;

the line switch, line switch is that alarm system disconnection usefulness, is found by the people after loudspeaker and warning light continue to send out the police dispatch newspaper, can prevent through the drive line switch that loudspeaker and warning light continue to form the interference to the people.

According to the invention, the baffle 3 can deform leftwards after being subjected to wind power, the deformation of the baffle 3 is mainly shown in the center of the baffle 3, the baffle 3 drives the fixing plate 5 to move leftwards through the connecting rod 6, the fixing plate 5 moves leftwards to drive the fixing block 7 to move leftwards, the fixing block 7 moves leftwards to respectively drive the two sliders 9 to move oppositely through the two transmission rods 11, and along with the movement trend of the sliders 9, the compression spring 10 prevents the sliders 9 from continuing to move oppositely, so that the baffle 3 is prevented from deforming, and the purpose of protecting the wafer 2 is achieved;

the fixed plate 5 moves leftwards to drive the fixed cylinder 13 to move leftwards, the fixed cylinder 13 moves leftwards to drive the racks 27 to move leftwards, the racks 27 drive the transmission gear 26 to rotate, the transmission gear 26 rotates to drive the ball screw 17 to rotate, the ball screw 17 rotates to drive the brush plate 18 to reciprocate in the vertical direction, and the brush plate 18 drives the brush bristles 19 to brush the surface of the wafer 2, so that the purpose of cleaning ash is achieved, and the influence of too much dust on the normal use of the wafer 2 is avoided;

the switch of the small motor 20 is turned on, the output shaft of the small motor 20 rotates to drive the first rotating shaft to rotate, the first rotating shaft drives the fan blades 21 to rotate, so that the aim of accelerating the air flow speed is fulfilled, the first rotating shaft also drives the second rotating shaft to rotate through the first bevel gear 22 and the second bevel gear 23, the second rotating shaft drives the rectangular plate 24 to rotate, the wind direction can be changed through the rotation of the rectangular plate 24, and therefore the heat dissipation is more uniform;

in the invention, the trigger block 14 and the receiving block 15 play the role of a detection module together, when the trigger block 14 is abutted against the receiving block 15, the crystal 2 is detected to reach the easily damaged range, and the whole circuit switch is equivalent to a closed state, so that the horn and the warning lamp are in a working state.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.