Patent Grant
10523850
The present invention relates to a camera device, and more particularly, to a camera device with an adjustable aperture
In conventional skills, an electronic apparatus equipped with a camera usually has an opening disposed on an external shell thereof. Thus, light rays can be transmitted to the lenses of the camera via the opening for facilitating image formation. Generally, such an opening will be covered by a transparent plate for preventing the dust from falling into the inner part of the electronic apparatus. However, in order to be convenient for manufacture, the transparent plate is just adhered to an external surface of the external shell in the conventional skills. Using such an approach, it is difficult to prevent the dust from falling into a blade room of an aperture adjusting device if the camera is of an aperture-adjustable type. In addition, if the size and volume of the camera can be further reduced, the thickness of the electronic apparatus equipped with the camera can be reduced as well. The thickness of conventional electronic apparatus equipped with the camera is still far from perfect.
Further, an aperture-adjustable camera is only carried out by a digital still camera or a digital camcorder, for example. Although photographic ability can be increased for a smartphone or a tablet by equipping with an external camera lens and the aperture adjustment can be carried out by the external camera lens, the aperture of a camera on a mobile terminal usually is fixed. Based on the requirement of thickness of the mobile terminal, it is a tough problem in this technical field to deploy an aperture adjusting device into the mobile terminal. However, it is quite useful if the aperture adjusting function is brought out to the mobile terminal since it can change the depth of field and improve the quality of a captured picture. Therefore, how to bring out the aperture adjusting function to the mobile terminal is an important development direction in this technical field.
An objective of the present invention is to provide a camera device for solving the technical problem caused by the dust falling into a blade room of an aperture adjusting device in the conventional skills.
Another object of the present invention is to provide a camera device for reducing the thickness of an electronic apparatus equipped with the camera device.
Another object of the present invention is to provide a camera device for carrying out an adjustment of aperture of a camera lens.
In an aspect, the present invention provides a camera device, which is disposed in an electronic apparatus, the electronic apparatus having an external shell with an opening exposed, the camera device having an optical system frame and a lens system deployed in the external shell of the electronic apparatus, the lens system being mounted on the optical system frame, the camera device comprising a bottom plate fastened to the optical system frame or formed by extending from the optical system frame, a cover plate fastened to the bottom plate and distanced away from the bottom plate, at least one shutter blade disposed between the cover plate and the bottom plate, configured to adjust an aperture of the camera device, and a transparent plate forming an accommodating space for accommodating the optical system frame, the bottom plate, and the cover plate, the transparent plate being located in the external shell and a part of the transparent plate being located between the bottom plate and the opening of the external shell, or between the cover plate and the opening of the external shell.
In another aspect, the present invention provides a camera device, which is disposed in an electronic apparatus, the electronic apparatus having an external shell with an opening exposed, the camera device having an optical system frame and a lens system deployed in the external shell of the electronic apparatus, the lens system being mounted on the optical system frame, the camera device comprising a bottom plate having a first opening, the bottom plate being fastened to the optical system frame or formed by extending from the optical system frame, the bottom plate further having a concave part formed thereon, a cover plate having a second opening, the cover plate being distanced away from the bottom plate, a fastening member having a base and an elongated part extending from the base, the base of the fastening member being accommodated in the concave part of the bottom plate, and the elongated part of the fastening member penetrating the concave part of the bottom plate and being fastened to the cover plate, and at least one shutter blade disposed between the cover plate and the bottom plate, configured to adjust an aperture of the camera device, wherein light rays are transmitted to the lens system sequentially via the opening of the external shell, the first opening of the bottom plate, and an aperture established by the shutter blade, and the second opening of the cover plate, or emitted out from the opening of the external shell in a reverse order.
In still another aspect, the present invention provides a camera device with adjustable aperture, comprising an optical system frame, a lens system mounted on the optical system frame, a plate configured to be fastened to the optical system frame or be formed by extending the optical system frame, the plate having an aperture; a shutter blade coupled to the plate, the aperture of the plate being completely pervious to light when the shutter blade is at a first position, the aperture of the plate being partially pervious to light when the shutter blade is at a second position, and a driver connecting to the shutter blade for causing a displacement of the shutter blade.
In another aspect, the present invention provides a camera device, which is disposed in an electronic apparatus, the electronic apparatus having an external shell with an opening exposed, the camera device having an optical system frame and an optical system deployed in the external shell of the electronic apparatus, the lens system being mounted on the optical system frame, the optical system comprising the present invention provides an optical lens, which makes object light rays transmit from an object side to an image side on an optical axis and form an image on an image plane, said optical lens comprising a lens group establishing the optical axis, comprising a first lens and a second lens arranged in order from the image side to the object side, wherein the first lens has an image-side surface which is a concave face and has a point of inflection arranged thereon, a first aperture stop and a second aperture stop separately located on the optical axis.
In still another aspect, the present invention provides a camera device, which is disposed in an electronic apparatus, the electronic apparatus having an external shell with an opening exposed, the camera device having an optical system frame and an optical system deployed in the external shell of the electronic apparatus, the lens system being mounted on the optical system frame, the optical system comprising a lens group establishing the optical axis, a first aperture stop disposed within the lens group and a second aperture stop disposed at the object side outside the lens group.
In another aspect, the present invention provides a camera device, which is disposed in an electronic apparatus, the electronic apparatus having an external shell with an opening exposed, the camera device having an optical system frame and a lens system deployed in the external shell of the electronic apparatus, the lens system being mounted on the optical system frame, the camera device comprising a bottom plate fastened to the optical system frame or formed by extending from the optical system frame, a cover plate fastened to the bottom plate and distanced away from the bottom plate, at least one shutter blade disposed between the cover plate and the bottom plate, configured to adjust an aperture of the camera device, and a transparent plate forming an accommodating space for accommodating the optical system frame, the bottom plate, and the cover plate, the transparent plate being located in the external shell and a part of the transparent plate being located between the bottom plate and the opening of the external shell, or between the cover plate and the opening of the external shell, wherein a lens system comprises a first lens, a first aperture stop, a second lens and a second aperture stop arranged in order from the image side to the object side.
In the embodiments of the present invention, the shutter blade of the aperture-adjustable device is deployed between the exposed opening of the external shell and the outermost lens of the lens system. Therefore, there has more room at the lateral side for accommodating the driver or other components of the aperture-adjustable device. Further, a part of the transparent plate is arranged corresponding to the opening and abuts on the external shell. The transparent plate is fastened to or adhered on the optical system frame. Every component of the camera devices is disposed in the accommodating space formed by the transparent plate. Therefore, this can further prevent the dust from falling into a blade room of the aperture-adjustable device accommodating the shutter blade and prevent a user finger from touch. In addition, the cover plate can be disposed within coverage of the bottom plate. It is easy to process the optical system frame made of a plastic material to remove or cut out some parts thereof for deploying a room accommodating the fastening member, thereby reducing the total thickness of the camera device.
In the embodiments of the present invention, the shutter blade has a hole having an aperture. The aperture of a camera lens can be adjusted by driving the shutter blade using a driver and thus making the hole move toward the optical axis and shift to a position overlapping the original aperture. There can have multiple sets of the shutter blade and the driver so as to carry out a multi-stage aperture adjustment of the camera lens. An adjustment of depth of field can thus be carried out by a selection of aperture. In addition, in the embodiments of the present invention, one shutter blade is cooperated with one driver. It is convenient in replacement when these components are malfunctioned.
To make the objectives, technical schemes, and technical effects of the present invention more clearly and definitely, the present invention will be described in details below by using embodiments in conjunction with the appending drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention, and as used herein, the term “embodiment” refers to an instance, an example, or an illustration but is not intended to limit the present invention. In addition, the articles “a” and “an” as used in the specification and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from the context to be directed to a singular form. Also, in the appending drawings, the components having similar or the same structure or function are indicated by the same reference number.
Please refer to
As shown in
Referring to
In addition, the lens system 17 may include at least two pieces of lenses and an aperture stop disposed between the two lenses or between the set of the two lenses and the image plane. For instance, the aperture established by the shutter blade 14 is an adjustable aperture while the aperture of the aperture stop arranged in the lens system 17 is a fixed aperture. The aperture established by the shutter blade 14 is smaller than or equal to the aperture of the aperture stop arranged in the lens system 17. The aperture of the optical system is defined by the aperture established by the shutter blade 14 when a small aperture is required by the optical system. The aperture of the optical system is defined by the aperture of the aperture stop arranged in the lens system 17 when a large aperture is required by the optical system. For instance, when a small aperture is required, the aperture established by the shutter blade 14 is adjusted to decrease the size of aperture thereof. The aperture stop arranged in the lens system 17 ceases to be effective due to the evolution of light path and is thus in an inactive state. When a large aperture is required, the aperture established by the shutter blade 14 is adjusted to be equal to the aperture of the aperture stop arranged in the lens system 17, and meanwhile the aperture of the optical system is defined by the aperture of the aperture stop arranged in the lens system 17. In this way, an aperture-adjustable device having the shutter blades 14 can be deployed at the outer side of the lens at the most object side. Since there has more room for accommodating such an aperture-adjustable device in this configuration, the size of the camera device 10 can be reduced.
In the embodiments of the present invention, the shutter blade 14 of the aperture-adjustable device is deployed between the exposed opening 110 of the external shell 11 and the outermost lens of the lens system 17. Therefore, there has more room at the lateral side for accommodating the driver or other components of the aperture-adjustable device. If the shutter blade 14 of the aperture-adjustable device is arranged between any two lenses, the deployment of the driver or other components of the aperture-adjustable device will be limited and such a deployment is more complicated and inconvenient. Further, in the embodiments of the present invention, a part of the transparent plate 12 is arranged corresponding to the opening 110 and abuts on the external shell 11. The transparent plate 12 is fastened to or adhered on the optical system frame 15. Every component of the camera devices is disposed in the accommodating space formed by the transparent plate 12. Therefore, this can further prevent the dust from falling into a blade room of the aperture-adjustable device accommodating the shutter blade 14 and prevent a user finger from touch.
The differences between the camera device 20 of the second embodiment and the camera device 10 of the first embodiment are that in the second embodiment of the present invention, the cover plate 13 is disposed within coverage of the bottom plate 16, and the bottom plate 16 is arranged at an upper side while the cover plate 13 is changed in its position to be at a lower side. A fastening member (e.g., a screw) 19 is utilized to fasten the cover plate 13 to the bottom plate 16 or the optical system frame 15. The shutter blade 14 is accommodated between the cover plate 13 and the bottom plate 16. Specifically, the bottom plate 16 has a concave part 161. The fastening member 19 has a base 191 and an elongated part 192 extending from the base 191. The base 191 of the fastening member 19 is accommodated into the concave part 161 of the bottom plate 161. The elongated part 192 of the fastening member 19 penetrates the concave part 161 of the bottom plate 16 and is fastened on the cover plate 13. In addition, as to the package framework of the camera device 20, a part of the transparent plate 12, the bottom plate 16, the shutter blade 14, the cover plate 13, the lens system 17, and the image recorder 18 are arranged in order from the exposed opening 110 of the external shell 11 to the lower plate 185. In addition, the light rays transmit into the lens system 17 sequentially via the exposed opening 110 of the external shell 11, a part of the transparent plate 12, the opening 160 of the bottom plate 16, the aperture established by the shutter blade 14, and the opening 130 of the cover plate 13. In other applications (e.g., projectors), the light rays may be emitted out from the exposed opening 110 of the external shell 11 in a reverse order. The advantages of such a technical scheme are that it is easy to process the optical system frame 15 made of a plastic material to remove or cut out some parts thereof for deploying a room accommodating the fastening member, thereby reducing the total thickness of the camera device.
The present invention can also have the camera device equipped with a aperture adjusting function such that an adjustment of depth of field can be carried out by a selection of aperture when a user takes pictures using the camera device on a mobile terminal, for example.
Please refer to
It should be noted that the afore-described deployment is merely for illustration, and the supporting base 22, the driver supporting base 24, and the lens supporting base 26 may not be clearly distinguished. They can be deemed as an optical system frame, or any two of them can be combined into one entity, or at least two of the supporting base 22, the driver supporting base 24, and the lens supporting base 26 or all of them are integratedly formed or made of a same material. In this way, the size of overall camera device can be reduced. For instance, the driver supporting base 24 and the lens supporting base 26 can be manufactured to be an integratedly-formed supporting base.
Specifically, the bottom plate 34 is fastened on the supporting base 22. Alternatively, the bottom plate 34 can also be formed by extending from the supporting base 22, or is just a part of the supporting base 22. The cover plate 33 is distanced a part from the bottom plate 34. Preferably, the cover plate 33 is fastened to the supporting base 22. Various types of ways may be utilized to fasten the cover plate 33 to the supporting base 22. For instance, the cover plate 33 has some branches while supporting base 22 has slots corresponding to the branches. By engaging the branches and the slots, the cover plate 33 can thus be fastened on the supporting base 22.
The cover plate 33 and the bottom plate 34 are separated from each other. An accommodating space is formed between the cover plate 33 and the bottom plate 34, and is configured to accommodate the first shutter blade 31 and the second shutter blade 32, which are utilized to change or adjust the effective aperture of the camera device. In addition, as shown in
As shown in
Correspondingly, the supporting base 22 has a second axle rod 222, and the second shutter blade 32 has a second axle hole 321 disposed corresponding to the position of the second axle rod 222. The bottom plate 34 and the cover plate 33 are perforated to form holes in corresponding positions. The second axle rod 222 penetrates the corresponding holes of the bottom plate 34 and the cover plate 33 and the second axle hole 321 of the second shutter blade 32. Alternatively, the bottom plate 34 and the cover plate 33 are manufactured with a configuration that is not prohibiting the second axle rod 222 from going through the second axle hole 321 of the second shutter blade 32. In this way, by using the deployment of the second axle rod 222 and the second axle hole 321, the second shutter blade 32 can pivot about an axial of the second axle rod 222.
The first driver 35 has a first rotating rod 351 disposed thereon. The first rotating rod 351 is driven by the first driver 35 and thus moves in an arc orbit. The first driver 35 can make the first rotating rod 351 move circularly or in an arc fashion. An appropriate transmission mechanism or structure can be deployed between the first driver 35 and the first rotating rod 351. For instance, the first rotating rod 351 is protruded from the surface of a disc, and the disc transfers the force of a rotation generated by the first driver 35 by using a wheel gear. The supporting base 22 has a first orbital hole 223 disposed corresponding to the arc orbit of the first rotating rod 351 of the first driver 35, and the first shutter blade 31 has a first applying hole 312, correspondingly. The bottom plate 34 and the cover plate 33 has holes in corresponding positions. The first rotating rod 351 of the first driver 35 penetrates the first orbital hole 223 of the supporting base 22, the corresponding holes of the bottom plate 34 and the cover plate 33 and the first applying hole 312 of the first shutter blade 31. The first applying hole 312 can also be configured to be intersect with the first orbital hole 223. Of course, the bottom plate 34 and the cover plate 33 can also be configured not to affect the movement of the first rotating rod 351. When the first rotating rod 351 rotates under control of the first driver 35, the first rotating rod 351 moves from a first position to a second position within the first orbital hole 223 of the supporting base 22. Meanwhile, the first rotating rod 351 applies a force to the first shutter blade 31 through the first applying hole 312, thereby generating a torque for the first shutter blade 31 in a first direction. Thus, the first shutter blade 31 rotates around the first axel rod 221 from a turn-on position to a turn-off position, for example. When the first rotating rod 351 moves from the second position to the first position within the first orbital hole 223, the first rotating rod 351 gives to the first shutter blade 31 a torque of a second direction opposite to the first direction. Meanwhile, the first shutter blade 31 rotates from the turn-off position to the turn-on position, for example.
Similarly, the second driver 36 has a second rotating rod 361 disposed thereon. The second rotating rod 361 is driven by the second driver 36 and thus moves in an arc orbit. An appropriate transmission mechanism or structure can be deployed between the second driver 36 and the second rotating rod 361 such that the second driver 36 can make the second rotating rod 361 move circularly or in an arc fashion. The supporting base 22 has a second orbital hole 224 disposed corresponding to the arc orbit of the second rotating rod 361 of the second driver 36, and the second shutter blade 32 has a second applying hole 322, correspondingly. The bottom plate 34 and the cover plate 33 has holes in corresponding positions. The second rotating rod 361 of the second driver 36 penetrates the second orbital hole 224 of the supporting base 22, the corresponding holes of the bottom plate 34 and the cover plate 33 and the second applying hole 322 of the second shutter blade 32. The second applying hole 322 can also be configured to be intersect with the second orbital hole 224. Of course, the bottom plate 34 and the cover plate 33 can also be configured not to affect the movement of the second rotating rod 361. When the second rotating rod 361 rotates under control of the second driver 36, the second rotating rod 361 moves from a first position to a second position within the second orbital hole 224 of the supporting base 22. Meanwhile, the second rotating rod 361 applies a force to the second shutter blade 32 through the second applying hole 322, thereby generating a torque for the second shutter blade 32 in a first direction. Thus, the second shutter blade 32 rotates around the second axel rod 222 from a turn-on position to a turn-off position, for example. When the second rotating rod 361 moves from the second position to the first position within the second orbital hole 224, the second rotating rod 361 gives to the second shutter blade 32 a torque of a second direction opposite to the first direction. Meanwhile, the second shutter blade 32 rotates from the turn-off position to the turn-on position, for example.
The bottom plate 34, the cover plate 33, and the supporting base 22 respectively has openings 340, 330, and 220 arranged along an optical axis of the camera device, for the entrance of light rays. The aperture of the camera device can be defined by an opening of a plate, which can be implemented by any one of the bottom plate 34, the cover plate 33, and the supporting base 22, or by other components having an opening on the optical axis. The overall aperture of the camera decreases when such an opening is blocked and thus decreases in size.
As shown in
For instance, when the first shutter blade 31 is at the turn-on position, the aperture of the plate is completely pervious to light; when the first shutter blade 31 is at the turn-off position, the aperture of the plate is partially pervious to light. Similarly, when the second shutter blade 32 is at the turn-on position, the aperture of the plate is completely pervious to light; when the second shutter blade 32 is at the turn-off position, the aperture of the plate is partially pervious to light.
Please refer to
Please refer to
Please refer to
The afore-described framework can carry out a three-stage aperture adjustment. The aperture of the optical system can be adjusted to the aperture of the plate, the first aperture, and the second aperture. In addition, the first driver 35 and the second driver 36 can be deployed at the lateral side of the optical system frame, for example, be disposed at two opposite sides of the driver supporting base. The above-described embodiments are illustrated by two shutter blades 31 and 32 cooperating with two drivers 35 and 36. It can be understood that assuming that one shutter blade and one driver are taken as a set of aperture adjusting device, there can have only one set of aperture adjusting device. However, it can also deploy three, four, or more sets of aperture adjusting device at the lateral side of the optical system frame for carrying out a multi-stage aperture adjustment. Further, it can also deploy two or more than two blade rooms arranged front and back. The holes of the shutter blades in the blade rooms are arranged with different apertures. In this way, this increases the number of types of aperture for the user to choose.
The present invention further provides a fourth embodiment. As shown in
Please refer to
Please refer to
The basic structure of the optical lens of the present inventions are illustrated by
In the illustrated optical lens, the aperture of the optical lens is defined by the aperture of the second aperture stop STO2 when a smaller aperture is required; the aperture of the optical lens is defined by the aperture of the first aperture stop STO1 when a larger aperture is required. For instance, when a smaller aperture is required, decrease the aperture of the second aperture stop STO2 to be at least less than the aperture of the first aperture stop STO1. Since the aperture of the first aperture stop STO1 is greater than that of the second aperture stop STO2, the first aperture stop STO1 ceases to be effective due to the evolution of light path and is thus in an inactive state. Meanwhile, the second aperture stop STO2 is in an active state, and therefore the smaller aperture of the optical lens is now defined by the aperture of the second aperture stop STO2. When a larger aperture is required, increase the aperture of the second aperture stop STO2 to be at least greater than the aperture of the first aperture stop STO1. Meanwhile, the second aperture stop STO2 ceases to be effective due to the evolution of light path and is thus in an inactive state. The first aperture stop STO1 is in an active state, and therefore the aperture of the optical lens is now defined by the first aperture stop STO1. The afore-described example is illustrated by taking the second aperture stop STO2 as an aperture stop with adjustable aperture for example. However, the following examples can also achieve above effects, that is, the first aperture stop STO1 is an aperture stop with adjustable aperture or both of the first aperture stop STO1 and the second aperture stop STO2 are adjustable in aperture. However, the second aperture stop STO2 that is adjustable in aperture has an advantage. That is, the aperture stop with adjustable aperture can be deployed at the outside of the lens at the most object side. Since there has more room for accommodating an aperture adjusting device in this configuration, the size of the optical lens can be reduced.
The afore-described optical framework improves the effective aperture range. In comparison to the optical lens having an aperture stop with adjustable aperture disposed within the lens group in the conventional skills, the optical lens of the present invention can deploy the aperture stop with adjustable aperture (that is, the second aperture stop STO2) at the outside of the lens group, and therefore the structural components or electric control components required to be used to mount the aperture-adjustable stop can be moved to the outside of the lens group, thereby carrying out further thinning of the optical lens.
The following is described with a package structure of the optical lens of the present invention.
Please refer to
As described above, the aperture adjusting blade 14 is disposed between the lens at the most object side and the exposed opening 110 of the external case 11. Therefore, in comparison to that disposed between any two lenses, this deployment leads to have more room at the lateral side for accommodating its driver and leads not to affect the deployment of other components. Further, the transparent plate 12 is fastened or attached to the optical system frame 15. Such a technical scheme can further prevent the dust from falling into the blade room accommodating the aperture adjusting blade 14.
Please refer to
The optical lens provided in the present invention will be further described with reference to the following five embodiments taking a mobile phone camera lens for example and the data adopted in the respective embodiments are listed for reference. The fifth embodiment is illustrated in
Some lenses in the optical lens of the present invention are aspheric lenses. The shape of an aspheric lens may be expressed by the following formula:
where z represents the sag of a point on the aspheric surface at a height h distanced to a central axis of the lens; C is a reciprocal of a paraxial curvature radius; r represents a height of a point on the aspheric surface with respect to the central axis; k is the conic constant of the aspheric lens; and α1, α2, . . . , and α10 are aspheric surface coefficients for even (greater than or equal to two) order terms.
The optical lens according to the fifth embodiment of the present invention also has at least two aperture stops, that is, a first aperture stop STO1 and a second aperture stop STO2. The first aperture stop STO1 is disposed between the fourth lens L4 and the fifth lens L5 and the second aperture stop STO2 is disposed at the outside of the lens at the most object side (that is, the fourth lens L4). The distance on the optical axis from the first aperture stop STO1 to the image plane IP is SL1, the distance on the optical axis from the second aperture stop STO2 to the image plane IP is SL2, and the distance on the optical axis from the object-side surface of the lens at the most object side (that is, the fourth lens L4) to the image plane IP is TTL. The optical lens according to the fifth embodiment of the present invention satisfies the following equation: 1.2<(SL1+SL2)/TTL<2.5.
As shown in Table 1 below, related data of the respective lenses of the optical lens shown in
Table 2 shows related data of aspheric lenses shown in Table 1.
Table 4 shows related data of aspheric lenses shown in Table 3.
The optical lens according to the seventh embodiment of the present invention also has at least two aperture stops, that is, a first aperture stop STO1 and a second aperture stop STO2. The first aperture stop STO1 is disposed between the third lens L3 and the fourth lens L4 and the second aperture stop STO2 is disposed at the outside of the lens at the most object side (that is, the fourth lens L4). The distance on the optical axis from the first aperture stop STO1 to the image plane IP is SL1, the distance on the optical axis from the second aperture stop STO2 to the image plane IP is SL2, and the distance on the optical axis from the object-side surface of the lens at the most object side (that is, the fourth lens L4) to the image plane IP is TTL. The optical lens according to the seventh embodiment of the present invention satisfies the following equation: 1.2<(SL1+SL2)/TTL<2.5.
As shown in Table 5 below, related data of the respective lenses of the optical lens shown in
Table 6 shows related data of aspheric lenses shown in Table 5.
Table 8 shows related data of aspheric lenses shown in Table 7.
Table 10 shows related data of aspheric lenses shown in Table 9.
In the embodiments of the present invention, the shutter blade has a hole having an aperture. The aperture of a camera lens can be adjusted by driving the shutter blade using a driver and thus making the hole move toward the optical axis and shift to a position overlapping the original aperture. There can have multiple sets of the shutter blade and the driver so as to carry out a multi-stage aperture adjustment of the camera lens. An adjustment of depth of field can thus be carried out by a selection of aperture. In addition, in the embodiments of the present invention, one shutter blade is cooperated with one driver. It is convenient in replacement when these components are malfunctioned.
While the preferred embodiments of the present invention have been illustrated and described in detail, various modifications and alterations can be made by persons skilled in this art. The embodiment of the present invention is therefore described in an illustrative but not restrictive sense. It is intended that the present invention should not be limited to the particular forms as illustrated, and that all modifications and alterations which maintain the spirit and realm of the present invention are within the scope as defined in the appended claims.
| Number | Date | Country | Kind |
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| 2015 1 1020384 | Dec 2015 | CN | national |
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