JP3811587B2 - Cover for shielding electromagnetic interference - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cover for shielding electromagnetic interference that covers an imaging device to prevent unnecessary radiation and electromagnetic interference (EMI) due to electromagnetic waves in a strong electric field environment.
[0002]
[Prior art]
In recent years, for example, an opportunity to use an imaging device under the condition of using a portable information terminal that emits electromagnetic waves, such as a mobile phone or a PHS (simple mobile phone), has increased. There is also an opportunity to use an imaging device in the vicinity of facilities that radiate powerful electromagnetic waves such as in the vicinity of radar in an air traffic control tower. In such a case, there is a risk that the imaging device is subject to electromagnetic interference. An environment in which such an electromagnetic interference is likely to occur is referred to as a “strong electric field environment”. Recently, the problem of using an imaging device under such a strong electric field environment has been highlighted.
[0003]
Imaging devices are often used in strong electric field environments that can cause electromagnetic interference, whether for broadcasting, commercial use, or consumer use. For example, imaging devices are often used in places where radio waves or television / radio broadcast waves are present. Even when a mobile phone or the like is used in the vicinity, it is susceptible to electromagnetic interference.
[0004]
Conventionally, as a countermeasure for blocking such electromagnetic interference, there is a shield with a metal casing sealing structure.
[0005]
[Problems to be solved by the invention]
However, a very strong electric field environment has recently appeared, and it has become impossible to prevent electromagnetic interference only with the shield of the conventional metal casing as described above. When electromagnetic interference occurs, there is a problem that the output video signal is disturbed, noise is mixed in the audio signal, or malfunction is caused in the imaging apparatus.
[0006]
Here, as a precondition for using an imaging apparatus used in a strong electric field environment, an effective measure for blocking electromagnetic interference has been desired.
[0007]
In view of such circumstances, the present invention was created to solve the above-described problems, and can effectively block electromagnetic interference when the imaging apparatus is used in a strong electric field environment. The purpose is to provide a cover for the barrier.
[0008]
[Means for Solving the Problems]
The electromagnetic interference blocking cover according to the present invention, which is intended to solve the above-described problems, is configured in a bag shape for housing an imaging device by sewing a conductive sheet. The image pickup device is inserted through the opening of the bag-like main body and stored inside, but by allowing the lens unit to face the outside through the opening, photographing can be performed even in the storage state. The operation of this configuration is as follows. For example, under conditions of use in a strong electric field environment, such as when using an imaging device under the condition of using a portable information terminal that emits electromagnetic waves such as a mobile phone or PHS, or when using an imaging device near the radar of an air traffic control tower When there is a risk of electromagnetic interference, the entire imaging device is covered with the electromagnetic interference shielding cover according to the present invention, so that electromagnetic waves in a strong electric field environment are shielded by the electromagnetic interference shielding cover. Make sure to prevent any damage. As a result, it is possible to prevent the disturbance of the output video signal due to electromagnetic interference, the mixing of noise into the audio signal, or the malfunction of the apparatus.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be generally described below.
[0010]
The electromagnetic interference blocking cover of the first invention is formed by sewing a conductive sheet, and has an opening for inserting an imaging device, and is configured in a bag shape for housing the imaging device . A part of the overlap is formed into an overlap, and a window hole for inserting and removing a recording medium is formed in the middle layer sheet portion and the inner layer sheet portion in the overlap, and the window hole is formed in the outer layer sheet portion in the overlap. A cover piece that opens and closes is formed, the cover piece corresponds to the position of the window hole, and the cover piece is formed larger than the window hole . According to the first aspect of the present invention, even under use conditions in a strong electric field environment, almost the entire imaging device can be covered completely and stably by the electromagnetic wave interference shielding cover, and in this state, the imaging device Can be protected from electromagnetic interference. As a result, it is possible to prevent the disturbance of the output video signal due to the electromagnetic wave interference, the mixing of noise into the audio signal, or the malfunction of the apparatus. Further, when the imaging device has a video recording function and a detachable device such as a card type memory is used as the recording medium, the recording medium can be taken in and out while the imaging device is housed. While the recording medium can be taken in and out as described above, the electromagnetic wave can be prevented from entering through the window hole by closing the cover with the cover piece.
[0011]
The cover for blocking electromagnetic interference according to a second aspect of the invention is the cover according to the first aspect, wherein the conductive sheet has a sandwich structure of a middle layer conductive cloth and an insulating cloth integrated on both the front and back surfaces of the conductive cloth. It is characterized by being configured into a thing. According to the second aspect of the invention, the inner layer of the conductive cloth prevents electromagnetic waves from entering the inside, the insulating cloth on both sides of the front and back reduces the shock from the outside, and reduces the uncomfortable feeling at the time of human contact. In addition, the sandwich structure has strength against pulling and inflection, and also has flexibility and good shooting workability and operability.
[0012]
According to a third aspect of the present invention, there is provided the electromagnetic wave interference shielding cover according to the first or second aspect, wherein a finder viewing window hole is formed at a position corresponding to the viewfinder portion in the housed state of the imaging device. Features. According to the third aspect of the invention, since the viewfinder portion of the image pickup apparatus can be viewed from the viewfinder viewing hole, the photographing operation and various operations are not hindered by an operator such as a cameraman, and are appropriate as usual. Work / operation can be performed. Further, it is possible to prevent a short circuit at the electric circuit portion exposed terminal.
[0013]
In the first to third inventions, the electromagnetic interference blocking cover of the fourth invention is provided with an index indicating the operation unit at a position corresponding to the operation unit in the housed state of the imaging device. It is characterized by being. According to the fourth aspect of the invention, the operation unit itself cannot be seen to cover the entire imaging apparatus including the operation unit, but the position of the operation unit can be known using the index as an index. The operability of the operation unit is not deteriorated, and appropriate work / operation that is not different from usual can be performed.
[0015]
The electromagnetic interference blocking cover according to a fifth aspect of the present invention is characterized in that, in the first to fourth aspects of the present invention, the cover piece is provided with an index indicating a recording medium outlet. According to the fifth aspect , it becomes clear at a glance that the cover piece is a recording medium outlet.
[0016]
According to a sixth aspect of the present invention, there is provided the electromagnetic interference blocking cover according to any one of the first to fifth aspects, a bag-like main body that houses the imaging device, and a bag-like extension that houses a controller connected to the imaging device. The bag-shaped extension is connected to the bag-shaped main body. When there is a risk of electromagnetic interference in a strong electric field environment with respect to an imaging apparatus that can perform part or all of the operation remotely in the controller, the sixth aspect of the present invention provides a controller, its connection cable, and By covering the entire imaging device with the electromagnetic interference blocking cover, not only the electromagnetic interference with respect to the imaging device but also the electromagnetic interference with respect to the controller and the connection cable including the microcomputer and the bus line can be avoided.
[0017]
In the first to sixth inventions, the electromagnetic interference blocking cover according to a seventh aspect of the present invention is a bag-shaped main body that stores the imaging device, and a bag-shaped extension that stores a cable connected to the imaging device. The bag-shaped extension is connected to the bag-shaped main body. The connection cable functions as a receiving antenna, and electromagnetic waves in a strong electric field environment may enter from the cable serving as the receiving antenna. According to the seventh aspect of the invention, since the imaging device including the cable is covered with the electromagnetic interference shielding cover, not only the direct electromagnetic interference on the imaging device but also the indirect electromagnetic interference via the connection cable is avoided. can do.
[0018]
Hereinafter, specific embodiments of the electromagnetic interference blocking cover of the present invention will be described in detail with reference to the drawings.
[0019]
(Embodiment 1)
FIG. 1A is a perspective view showing a state before the electromagnetic interference blocking cover of Embodiment 1 is placed on the imaging apparatus, and FIG. 1B is a perspective view showing the state of the covered state. FIG. 2 is a cross-sectional view showing a schematic configuration of a conductive sheet as a main constituent material of the electromagnetic interference blocking cover. A camera-integrated VTR (handy camera) is illustrated as an imaging device.
[0020]
The electromagnetic interference blocking cover 50 according to the first embodiment shown in FIG. 1 is configured in a bag shape. The bag-shaped electromagnetic interference blocking cover 50 is based on the conductive sheet 1 shown in FIG. The electromagnetic interference blocking cover 50 is configured by sewing the conductive sheet 1 into a bag shape. This bag-shaped electromagnetic interference blocking cover 50 is configured to be inserted and housed with the imaging device 20.
[0021]
The conductive sheet 1 has a sandwich structure of a middle layer conductive fabric 2 and insulating fabrics 3 and 3 laminated and integrated on both front and back surfaces of the conductive fabric 2. Among these, the conductive cloth 2 is a cloth made of a conductive material, and has a function of blocking electromagnetic waves. The electromagnetic wave shielding performance is sufficiently effective against electromagnetic waves in a strong electric field environment. The insulating fabric 3 is obtained by processing a fabric such as cotton that does not feel uncomfortable even when it comes into contact with the human body, and prevents a short circuit of an exposed terminal of an electric circuit such as a microphone terminal in the conductive fabric 2. It has a function.
[0022]
By cutting the conductive sheet 1 having the sandwich structure of the conductive fabric 2 shown in FIG. 2 and the insulating fabrics 3 and 3 on both sides of the conductive fabric 2 into a required shape and sewing them in the required procedure, the bag shape shown in FIG. The electromagnetic interference blocking cover 50 is manufactured.
[0023]
As elements of the imaging device 20, reference numeral 21 denotes an imaging device body, 22 denotes a lens unit, 23 denotes a viewfinder unit, 24 denotes a battery unit, and 25 denotes a handle unit.
[0024]
The cover 50 for blocking electromagnetic interference has a bag-shaped main body 11 formed in a bell shape and is rotationally symmetric around its center line, and one end portion in the center line direction accommodates the imaging device 20. The other end is sewn into a bottomed shape. A finder viewing hole 13 corresponding to the viewfinder 23 of the imaging device 20 is formed in the bag-shaped main body 11.
[0025]
The size of the bell-shaped bag-shaped main body 11 is such that when the imaging device 20 is inserted through the opening 12, the entire body is substantially accommodated. That is, the size of the opening 12 is slightly larger than the largest cross-sectional area of the imaging device 20, and the depth of the bag-shaped main body 11 is long enough to accommodate the entire imaging device 20. It has become.
[0026]
By inserting the entire imaging device 20 including the imaging device body 21, the lens unit 22, the viewfinder unit 23, the battery unit 24, and the handle unit 25 into the electromagnetic interference blocking cover 50 from the opening 12, The entire imaging device 20 is accommodated in the electromagnetic interference shielding cover 50. That is, the entire imaging device 20 is covered with the electromagnetic interference blocking cover 50. At this time, the lens surface of the lens unit 22 is exposed to the outside from the opening 12 of the electromagnetic interference blocking cover 50, and the viewfinder surface of the viewfinder unit 23 is covered with the finder viewing window hole 13.
[0027]
For example, when the imaging device 20 is used under the condition of using a portable information terminal that emits electromagnetic waves, such as a mobile phone or a PHS (simple mobile phone), or when the imaging device 20 is used in the vicinity of a radar of an air traffic control tower. If it is considered that there is a risk of electromagnetic interference under use conditions in a strong electric field environment, the electromagnetic interference blocking cover 50 is used. That is, by covering almost the entire imaging device 20 with the electromagnetic interference blocking cover 50, the electromagnetic interference in the strong electric field environment is blocked by the electromagnetic interference blocking cover 50, and it is ensured that the electromagnetic waves damage the imaging device 20. To prevent. As a result, it is possible to prevent the disturbance of the output video signal due to electromagnetic interference, the mixing of noise into the audio signal, or the malfunction of the apparatus.
[0028]
The bag-like electromagnetic interference shielding cover 50 accommodates almost the entire imaging device 20 in a stable and stable manner, and the viewfinder 23 to be viewed by an operator such as a cameraman is provided from the viewfinder viewing window hole 13 to the outside. Therefore, the photographing operation and various operations by the operator are not hindered, and proper operations and operations that are different from usual operations are possible. Of course, there is no worry that the electromagnetic interference blocking cover 50 may be accidentally removed during shooting. Further, there is no possibility that the exposed terminal of the electric circuit such as the microphone terminal will cause a short circuit.
[0029]
(Embodiment 2)
In the second embodiment, various operation units in the imaging apparatus are devised so that they can be properly operated regardless of the mounting of the electromagnetic interference shielding cover. FIG. 3 is a schematic diagram illustrating the electromagnetic interference blocking cover and the imaging apparatus according to the second embodiment.
[0030]
In the imaging device 20, it is assumed that operation units 26 and 27 are provided on the side surface of the imaging device main body 21. The operation units 26 and 27 have various functions such as gain switching and auto white / black balance according to function, and there are operation switches, operation buttons, operation keys, operation levers and the like according to types. There are various forms such as a press type, a slide type, a swing type, and a rotary type. In the bag-shaped main body portion 11 of the electromagnetic wave interference shielding cover 50, indexes 14 and 15 are provided corresponding to the operation portions 26 and 27 of the imaging device 20 to indicate that the position is a specific operation portion. Yes. What is necessary is just to sew the thing produced separately from the bag-shaped main-body part 11 as the indexes 14 and 15 to the required location of the bag-shaped main-body part 11, etc. It is assumed that the function names and the like of the operation units 26 and 27 corresponding to the indexes 14 and 15 are written by printing or the like. The function name or the like may be an iconic picture display. The indexes 14 and 15 may be embroidered, or may be affixed with a sticker that can recognize each operation unit.
[0031]
Note that the finder viewing window hole 13 as in the first embodiment (FIG. 1) is not provided. However, it goes without saying that a similar viewfinder viewing hole 13 may be provided.
[0032]
When there is a risk of electromagnetic interference in a strong electric field environment, the electromagnetic interference is avoided by housing the entire imaging device 20 in the electromagnetic interference blocking cover 50 and covering it as in the case of the first embodiment.
[0033]
The relationship between the electromagnetic interference blocking cover 50 and the imaging device 20 is an index 14 indicating that the position of the imaging device 20 with respect to the electromagnetic interference blocking cover 50 is a specific operation unit in a required storage state. , 15 correspond to the operation units 26, 27. Therefore, in the retracted state, the operation units 26 and 27 themselves cannot be seen, but the positions of the operation units 26 and 27 can be known using the indexes 14 and 15 as indexes. When an operator such as a photographer intends to operate the operation unit 26 or 27, the operator operates the operation unit by placing a finger on the index 14 or 15 as a reference.
[0034]
As described above, according to the second embodiment, the imaging device 20 is covered with the electromagnetic interference blocking cover 50 in order to avoid electromagnetic interference, but nevertheless, in a state corresponding to the operation units 26 and 27. Since the indexes 14 and 15 indicating the position can be used as an operation index, the operability of the operation units 26 and 27 is not deteriorated for an operator such as a cameraman, and appropriate work that is not different from usual.・ Operation is possible.
[0035]
(Embodiment 3)
In the third embodiment, when an imaging apparatus has a video recording function and a detachable recording medium such as a card memory is used as the recording medium, the recording medium can be taken in and out while the imaging apparatus is stored. It is about the electromagnetic wave interference shielding cover.
[0036]
FIG. 4 is a schematic perspective view showing the electromagnetic interference blocking cover of the third embodiment. An overlap 16 is formed by folding a part of the bag-shaped main body 11. In the overlap 16, the bag-shaped main body 11 has a three-layer structure including an outer layer sheet portion 16a, an intermediate layer sheet portion 16b, and an inner layer sheet portion 16c.
[0037]
In the middle layer sheet portion 16b and the inner layer sheet portion 16c, window holes 17b and 17c for taking in and out the recording medium are formed so as to correspond to each other. The positions where the window holes 17b and 17c are formed correspond to the positions of the recording medium loading ports in the image pickup apparatus 20 in the storage posture in a state where the image pickup apparatus 20 is stored in the bag-shaped electromagnetic interference blocking cover 50. To do. The outer sheet portion 16a is provided with a cover piece 17a for opening and closing the window holes 17b and 17c in correspondence with the positions. The cover piece 17a is formed by making a U-shaped cut 18 in the outer layer sheet portion 16a. The cover piece 17a is preferably provided with an index indicating that the position is the place where the recording medium is put in and out.
[0038]
When the recording medium is attached to and detached from the imaging device 20, the cover piece 17a is turned to open the window holes 17b and 17c, and the recording medium is taken in and out of the opened window holes 17b and 17c. When it is finished, the cover piece 17a is closed. In order to stabilize the closed state of the cover piece 17a, it is preferable to use a zipper, a magic fastener or a button.
[0039]
In the third embodiment, although the recording medium can be taken in and out through the window holes 17b and 17c, the cover piece 17a is provided, so that intrusion of electromagnetic waves from the window holes 17b and 17c is prevented. can do.
[0040]
(Embodiment 4)
Although some or all of the operations of the imaging apparatus may be performed by an external controller, the fourth embodiment relates to an electromagnetic interference blocking cover for taking countermeasures against electromagnetic interference including such a controller. .
[0041]
FIG. 5 is a schematic diagram illustrating a state in which the imaging apparatus including the controller is covered with an electromagnetic interference shielding cover. An external controller 30 is connected to the imaging device main body 21 of the imaging device 20 via the connection cable 31. The controller 30 includes various operation units such as a data bus, an address bus, and gain switching for communicating with the microcomputer and the imaging device 20.
[0042]
The electromagnetic interference blocking cover 50 includes a bag-like main body 11 that houses the imaging device 20, and a controller-like bag-like extension 11 a that houses the entire controller 30 including the connection cable 31. 11a is sewn to the bag-like main body portion 11 in series. Alternatively, the bag-like extension 11 a may be detachable from the bag-like main body 11.
[0043]
In addition, it is preferable to attach | subject the index which shows that there is a storage location of the controller 30 to the innermost part corresponding to the controller 30 among the bag-like extension parts 11a.
[0044]
Further, in the bag-shaped main body 11, a viewfinder viewing window hole 13 for the viewfinder as in the first embodiment (FIG. 1) may be provided, and the second embodiment (FIG. 3). Indexes 14 and 15 for the operation unit index as shown in FIG.
[0045]
When there is a risk of electromagnetic interference in a strong electric field environment with respect to the imaging device 20 that allows part or all of the operations to be performed remotely by the controller 30, the controller 30, the connection cable 31, and the imaging device 20 The whole is covered with an electromagnetic interference shielding cover 50. That is, the controller 30 and the connection cable 31 are inserted all the way into the bag-like extension portion 11 a, and almost the entire imaging device 20 is accommodated in the bag-like main body portion 11. Thereby, not only the electromagnetic interference with respect to the imaging device 20 but also the electromagnetic interference with respect to the controller 30 and the connection cable 31 including the microcomputer and the bus line can be avoided.
[0046]
(Embodiment 5)
Cables of various devices such as a news microphone may be connected to the imaging device. The fifth embodiment relates to an electromagnetic interference shielding cover for taking countermeasures against electromagnetic interference including such a connection cable.
[0047]
FIG. 6 is a schematic view showing a state in which the imaging apparatus including the connection cable is covered with an electromagnetic interference shielding cover. One or a plurality of connection cables 40 are detachably connected to the imaging device main body 21 of the imaging device 20.
[0048]
When there is a risk of electromagnetic interference in a strong electric field environment, the connection cable 40 may serve as a receiving antenna, and electromagnetic waves may enter the connection cable 40. If so, there is a possibility that the video signal transmitted via the connection cable 40 is disturbed, or noise is mixed in the control signal received via the connection cable 40, causing the imaging device 20 to malfunction.
[0049]
The electromagnetic interference blocking cover 50 includes a bag-shaped main body 11 for storing the imaging device 20 and a tail-shaped (tail-shaped) bag-shaped extension 11b for storing the connection cable 40. The bag-like extension part 11b is sewn to the bag-like main body part 11 in series. Alternatively, the bag-like extension portion 11 b may be detachable from the bag-like main body portion 11. One end of the connection cable bag-like extension 11 b is an opening for connecting the connector of the connection cable 40.
[0050]
The bag-like main body 11 may be provided with a viewfinder viewing hole 13 for the viewfinder as in the first embodiment (FIG. 1), or in the second embodiment (FIG. 3). Indexes 14 and 15 for the operation unit index as shown in FIG.
[0051]
When there is a risk of electromagnetic interference in a strong electric field environment, the entire imaging device 20 and connection cable 40 are covered with an electromagnetic interference blocking cover 50. That is, the connection cable 40 is passed through the bag-like extension portion 11 b, and almost the entire imaging device 20 is accommodated in the bag-like main body portion 11. Thereby, not only the direct electromagnetic interference with respect to the imaging device 20 but also the indirect electromagnetic interference through the connection cable 40 can be avoided.
[0052]
Although the electromagnetic interference blocking cover 50 of any of the above embodiments has been described as having a shape in which the conductive sheet 1 is sewn in a bag shape, the opening 12 is opened and closed at the lip portion of the opening 12. You may make it provide the string for performing.
[0053]
【The invention's effect】
As described above, according to the present invention, when there is a possibility of electromagnetic interference under the use condition in a strong electric field environment, the electromagnetic wave in the strong electric field environment can be blocked by the electromagnetic wave blocking cover. Therefore, it is possible to prevent the disturbance of the output video signal due to the electromagnetic interference, the mixing of noise into the audio signal, or the malfunction of the apparatus.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an electromagnetic interference blocking cover according to Embodiment 1 of the present invention and an imaging apparatus covered by the cover. FIG. 2 is a constituent material of an electromagnetic interference blocking cover according to each embodiment of the present invention. FIG. 3 is a schematic view showing an electromagnetic interference shielding cover and an imaging device according to Embodiment 2 of the present invention. FIG. 4 is an electromagnetic interference shielding according to Embodiment 3 of the present invention. FIG. 5 is a schematic diagram showing an electromagnetic interference blocking cover according to a fourth embodiment of the present invention, and an imaging device and a controller covered by the cover. FIG. 6 is an electromagnetic interference according to a fifth embodiment of the present invention. Schematic diagram showing the shielding cover, the imaging device covered by the cover, and the connection cable
DESCRIPTION OF SYMBOLS 1 ... Conductive sheet 2 ... Conductive cloth 3 ... Insulating cloth 11 ... Bag-like main-body part 11a ... Bag-like extension part 11b for controllers ... Bag-like extension part 12 for a connection cable ... Opening part 13 ... Finder observation window hole 14 , 15 ... Index for operation section index 16 ... Overlap 16a ... Outer layer sheet portion 16b ... Middle layer sheet portion 16c ... Inner layer sheet portion 17a ... Cover pieces 17b and 17c for opening / closing the window hole ... Window hole 18 for taking in / out the recording medium ... Incision 20 ... Imaging device 22 ... Lens part 23 ... Viewfinder parts 26, 27 ... Operation part 30 ... Controller 31 ... Connection cable 40 ... Connection cable 50 ... Electromagnetic wave interference shielding cover

Claims (7)

The conductive sheet is sewn, has an opening for inserting the imaging device, and is configured in a bag shape for storing the imaging device ,
A part of the bag-like main body portion is folded to be an overlap, and a window hole for taking in and out the recording medium is formed in the intermediate layer sheet portion and the inner layer sheet portion in the overlap, and the outer layer sheet portion in the overlap A cover piece for opening and closing the window hole is formed, the cover piece corresponds to the position of the window hole, and the cover piece is formed to be larger than the window hole. Cover.   2. The electromagnetic wave interference according to claim 1, wherein the conductive sheet is configured to have a sandwich structure of a middle layer conductive fabric and an insulating fabric integrated on both front and back surfaces of the conductive fabric. Cover for blocking.   3. The electromagnetic interference blocking cover according to claim 1, wherein a viewfinder viewing hole is formed at a position corresponding to the viewfinder portion when the image pickup apparatus is housed. 4.   4. The electromagnetic wave disturbance blocking device according to claim 1, wherein an index indicating the operation unit is attached to a position corresponding to the operation unit in the storage state of the imaging apparatus. 5. Cover. The electromagnetic interference blocking cover according to any one of claims 1 to 4, wherein the cover piece is provided with an index indicating a recording medium outlet. A bag-like main body for housing the imaging device and a bag-like extension for housing a controller connected to the imaging device, wherein the bag-like extension is connected to the bag-like main body. The electromagnetic interference blocking cover according to any one of claims 1 to 5 . It has a bag-like main body for accommodating the imaging device and a bag-like extension for accommodating a cable connected to the imaging device, and the bag-like extension is connected to the bag-like main body. The electromagnetic interference blocking cover according to any one of claims 1 to 6 .

Images