JP6471607B2 - Electronics - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly, to an electronic device including a GPS (Global Positioning System).

  Some electronic devices that are carried and used by a user such as a photographing apparatus include a wireless communication element such as a GPS module. This type of imaging apparatus can record the location where the image was captured as meta-information in the image file by associating the captured image with the positioning result of the GPS module. The GPS module includes a GPS antenna that receives GPS satellite signals from satellites. Since the GPS satellite signal from the satellite is weak, it is necessary to suppress electromagnetic noise (electromagnetic noise) incident on the GPS antenna in order to obtain an accurate positioning result.

  Japanese Patent Application Laid-Open No. 2004-151561 describes a photographing apparatus that suppresses electromagnetic noise incident on a GPS antenna. In the photographing apparatus described in Patent Document 1, a metal member is provided on the apparatus main body side of the substrate on which the GPS antenna is mounted. The metal member shields electromagnetic noise generated in the apparatus main body, so that electromagnetic noise incident on the GPS antenna can be suppressed.

JP 2013-21520 A

  By the way, the metal member described in Patent Document 1 is used mainly to shield only electromagnetic noise from directly under the GPS antenna in the photographing apparatus, and the shielding effect of electromagnetic noise is insufficient.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to shield electromagnetic noise from the inside of an electronic device, thereby suppressing an adverse effect of the electromagnetic noise on a wireless communication element. To provide electronic equipment.

  An electronic apparatus according to an embodiment of the present invention includes a conductive member that is at least partially formed of a conductive material, is disposed so as to surround an electronic circuit, and is disposed at a position where at least a wireless communication unit is exposed from the conductive member. A wireless communication element. In this configuration, the electronic circuit performs predetermined signal processing on the signal output from the wireless communication element.

  With such a configuration, electromagnetic noise generated in the electronic circuit is shielded by the conductive member and is not easily incident on the wireless communication unit. As a result, the wireless communication unit is not easily affected by electromagnetic noise.

  Moreover, in one Embodiment of this invention, the electroconductive member may be formed in the shell shape and may have the recessed part formed indented toward the inner side of the electroconductive member. In this case, the wireless communication element is disposed in the recess.

  With such a configuration, the wireless communication element is covered with the concave portion of the conductive member. Therefore, the electromagnetic noise generated inside and outside the electronic device is shielded by the recess and is not easily incident on the wireless communication unit.

  Moreover, in one Embodiment of this invention, a radio | wireless communication element has a circuit board with which a radio | wireless communication part is mounted, and may be arrange | positioned in the position exposed from a conductive member with a circuit board. In this case, the circuit board is grounded to the conductive member.

  According to such a configuration, the ground voltage of the circuit board can be stabilized and the communication accuracy of the wireless communication element can be improved.

  The electronic device according to an embodiment of the present invention may further include a noise shielding member that is formed of a conductive material and disposed between the circuit board and the conductive member. In this case, the circuit board is grounded to the conductive member via the noise shielding member.

  According to such a configuration, since the circuit board is installed via the noise shielding member having a small electric resistance, the ground resistance of the circuit board can be lowered. Thereby, the ground voltage of the wireless communication element is stabilized, and the communication accuracy of the wireless communication element can be improved. Moreover, since the noise shielding member shields electromagnetic noise, electromagnetic noise can be prevented from entering the wireless communication unit of the wireless communication element.

  The electronic apparatus according to an embodiment of the present invention further includes a non-conductive member formed of a non-conductive material that covers the wireless communication unit exposed from the conductive member.

  According to such a configuration, the wireless communication element can be protected without affecting the wireless communication by the wireless communication element.

  In one embodiment of the present invention, the conductive member may have an opening that communicates the inside and the outside of the conductive member. In this case, the wireless communication element and the electronic circuit are connected through the opening.

  According to such a configuration, while suppressing electromagnetic noise generated inside the electronic apparatus from being incident on the wireless communication element, the electric circuit disposed inside the conductive member and the wireless communication disposed outside. The element can be easily connected.

  The electronic apparatus according to an embodiment of the present invention may further include a photographing optical system that is provided on the conductive member and forms a subject image, and an imaging element that captures the subject image and outputs an image signal. Good. In this configuration, the electronic circuit processes the signal output from the wireless communication element in association with the image signal.

  According to an embodiment of the present invention, an electronic device suitable for suppressing an adverse effect of the electromagnetic noise on the wireless communication element by shielding the electromagnetic noise from inside the electronic device is provided.

It is a block diagram which shows the structure of the imaging device which concerns on embodiment of this invention. It is a front perspective view of a camera body part concerning an embodiment of the present invention. It is a back perspective view of a camera body part concerning an embodiment of the present invention. It is a disassembled perspective view of the camera main-body part which concerns on embodiment of this invention. It is a disassembled perspective view of the camera main-body part which concerns on embodiment of this invention. It is a front perspective view of the metal case concerning the embodiment of the present invention. It is sectional drawing of the camera main-body part which concerns on embodiment of this invention.

  Hereinafter, an electronic apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following, a digital single lens reflex camera will be described as an embodiment of the present invention. Electronic devices are not limited to digital single-lens reflex cameras, but include, for example, compact digital cameras, mirrorless single-lens cameras, video cameras, camcorders, tablet terminals, smartphones, PHS (Personal Handy phone System), feature phones, portable game machines, and the like. This device may be replaced with another device that is carried and used by the user.

  FIG. 1 is a block diagram showing a configuration of a digital single-lens reflex camera (hereinafter referred to as “photographing device”) 1 of the present embodiment. As shown in FIG. 1, the photographing apparatus 1 includes a camera body 10 and an interchangeable lens 20 that is detachably attached to the camera body 10.

  The camera body 10 includes a system controller 100, an operation unit 102, a drive circuit 104, a GSP module 108, a shutter 110, a solid-state image sensor 112, a signal processing circuit 114, and an image processing engine in a hollow shell-shaped metal casing 30. 116, a buffer memory 118, a card interface 120, an LCD (Liquid Crystal Display) control circuit 122, and a ROM (Read Only Memory) 126. The camera body 10 includes an LCD 124 on the outside of the metal housing 30. The interchangeable lens 20 includes a photographic lens 200 and a diaphragm 202. Although the photographing lens 200 has a plurality of lenses, FIG. 1 shows it as a single lens for convenience.

  The operation unit 102 includes various switches such as a power switch, a release switch, and a shooting mode switch, which are necessary for a user (photographer) of the shooting apparatus 1 to operate the shooting apparatus 1. When the photographer operates the power switch, power is supplied from a battery (not shown) to various circuits of the photographing apparatus 1 through a power line.

  The system controller 100 includes a CPU (Central Processing Unit) and a DSP (Digital Signal Processor). After supplying power, the system controller 100 accesses the ROM 126, reads out a control program, loads it into a work area (not shown), and executes the loaded control program to control the entire photographing apparatus 1.

  When the release switch is operated, the system controller 100 uses, for example, a photometric value calculated from a live view (described later) imaged by the solid-state image sensor 112 or an exposure meter (not shown) built in the imaging apparatus 1. The diaphragm 202 and the shutter 110 are driven and controlled via the drive circuit 104 so that proper exposure is obtained based on the measured photometric value. More specifically, drive control of the aperture 202 and the shutter 110 is performed based on an AE function specified by the shooting mode switch, such as a program AE (Automatic Exposure), shutter priority AE, aperture priority AE, or the like. Further, the system controller 100 performs AF (Autofocus) control together with AE control. An active method, a phase difference detection method, a contrast detection method, or the like is applied to the AF control. The AF mode includes a central single-point ranging mode using a single central ranging area, a multi-point ranging mode using a plurality of ranging areas, and the like. The system controller 100 controls driving of the photographing lens 200 via the drive circuit 104 based on the AF result, and adjusts the focus of the photographing lens 200. Since the configuration and control of this type of AE and AF are well known, detailed description thereof is omitted here.

  The light flux from the subject passes through the photographing lens 200, the diaphragm 202, and the shutter 110 and is received by the light receiving surface of the solid-state image sensor 112. The solid-state imaging device 112 is a single-plate color CCD (Charge Coupled Device) image sensor having a Bayer pixel arrangement. The solid-state imaging device 112 accumulates the subject image formed by each pixel on the light receiving surface as a charge corresponding to the amount of light, and generates R (Red), G (Green), and B (Blue) image signals. Output. The solid-state image sensor 112 is not limited to a CCD image sensor, and may be replaced with a CMOS (Complementary Metal Oxide Semiconductor) image sensor or other types of imaging devices. The solid-state image sensor 112 may also have a complementary color filter mounted thereon.

  The signal processing circuit 114 performs predetermined signal processing such as clamping and demosaicing on the image signal input from the solid-state imaging device 112 and outputs the processed signal to the image processing engine 116. The image processing engine 116 performs predetermined signal processing such as matrix operation, Y / C separation, and white balance on the image signal input from the signal processing circuit 114 to generate a luminance signal Y and color difference signals Cb and Cr. , And compressed in a predetermined format such as JPEG (Joint Photographic Experts Group). The buffer memory 118 is used as a temporary storage location for processing data when the image processing engine 116 executes processing. The storage format of the captured image is not limited to the JPEG format, and may be a RAW format in which only minimal image processing (for example, black level correction processing of the image area) is performed.

  A memory card 300 is detachably inserted into a card slot of the card interface 120. The image processing engine 116 can communicate with the memory card 300 via the card interface 120. The image processing engine 116 stores the generated compressed image signal (captured image data) in the memory card 300 (or a built-in memory (not shown) provided in the image capturing apparatus 1).

  Further, the image processing engine 116 buffers the generated luminance signal Y and color difference signals Cb and Cr in a frame memory (not shown) in units of frames. The image processing engine 116 sweeps the buffered signal from each frame memory at a predetermined timing, converts it into a video signal of a predetermined format, and outputs it to the LCD control circuit 122. The LCD control circuit 122 modulates and controls the liquid crystal based on the image signal input from the image processing engine 116. Thereby, the photographed image of the subject is displayed on the display screen of the LCD 124. The photographer can view a real-time through image (live view) photographed with appropriate exposure and focus based on the AE control and AF control through the display screen of the LCD 124.

  When a photographer performs a reproduction operation of a photographed image, the image processing engine 116 reads photographed image data designated by the operation from the memory card 300 or a built-in memory (not shown) and converts it into an image signal of a predetermined format. , Output to the LCD control circuit 122. The LCD control circuit 122 performs modulation control on the liquid crystal based on the image signal input from the image processing engine 116, so that the captured image is displayed on the display screen of the LCD 124.

  The GPS module 108 is a wireless communication element that receives GPS satellite signals from satellites in the sky and outputs positioning results at predetermined intervals. The system controller 100 associates the captured image data with the positioning result input from the GPS module 108 and records the location where the image was captured as meta information in the captured image data.

  2 and 3 are a front perspective view and a rear perspective view of the camera body 10, respectively. For convenience of explanation, FIGS. 2 and 3 do not show the interchangeable lens 20 attached to the camera body 10.

  A part of the housing of the camera body 10 is formed of a conductive material such as a metal, and a part of the housing is formed of a non-conductive material such as a resin. For example, a metal material such as a magnesium alloy or stainless steel is used for a portion (hereinafter, referred to as “metal casing 30”) formed of a conductive material of the camera body 10. By using a metal material for the housing of the camera body 10, the strength of the camera body 10 can be improved. A plurality of operation units 102 including a release switch 102a, an LCD 124, a mount unit 31 on which the interchangeable lens 20 is mounted, and the like are disposed outside the metal housing 30. A grip 32 for a user to hold is provided on the side surface of the metal housing 30.

  Hereinafter, the side on which the mount portion 31 of the camera body 10 is provided is defined as the front, and the side on which the LCD 124 is provided is defined as the rear. Further, the side of the camera body 10 where the grip 32 is provided is defined as the right side, and the side opposite to the grip 32 across the mount 31 of the camera body 10 is defined as the left side. Further, the side of the camera body 10 on which the release switch 102a is provided is defined as the upper side, and the opposite side is defined as the lower side.

  A resin member 33 made of a non-conductive material such as resin is provided on the upper portion of the camera body 10. FIG. 4 is an exploded perspective view of the camera body 10 with the resin member 33 removed. The GPS module 108 is arranged on the upper part of the camera body 10 so that GPS satellite signals from satellites in the sky can be easily received. The metal housing 30 shields or attenuates GPS satellite signals. Therefore, in order to prevent the GPS satellite signal received by the GPS module 108 from being shielded or attenuated, the GPS module 108 is disposed at a position exposed from the upper part of the metal housing 30.

  The GPS module 108 is covered and protected by the resin member 33. The resin material passes GPS satellite signals. Therefore, the resin member 33 can protect the GPS module 108 without substantially affecting the reception of GPS satellite signals.

  5 and 6 are an exploded perspective view of the camera main body 10 and a front perspective view of the metal housing 30 alone, respectively. FIG. 7 is a cross-sectional view of the camera body 10. FIG. 5 shows a state in which the resin member 33, the GPS module 108, the FPC (Flexible Printed Circuits) 40, the noise shielding member 42, and the wiring 44 are removed from the camera body 10.

  The metal housing 30 includes housing members 35a to 35c formed of a plurality of nonconductive materials. The casing members 35a to 35c are electrically connected to each other. The casing material member 35 a mainly forms a portion extending from the upper part to the rear part of the metal casing 30. The housing member 35b mainly forms the front portion, the left and right side surfaces, and the lower portion of the metal housing 30. The housing member 35 c mainly forms the rear part of the metal housing 30. An LCD 124 is disposed outside the housing member 35c. The metal casing 30 is formed in a hollow shell shape by the plurality of casing members 35a to 35c. Inside the metal housing 30, an electric circuit 130 including the solid-state imaging device 112, the system controller 100, and the like are arranged. A recess 36 that is recessed downward is formed in the upper portion of the metal casing 30. A holding member 46 made of a resin material is disposed in the recess 36. The GPS module 108 is disposed in the recess 36 while being held by the holding member 46.

  A noise shielding member 42 made of a conductive material such as metal is disposed between the GPS module 108 and the recess 36. Specifically, the noise shielding member 42 is disposed between the holding member 46 and the GPS module 108 in the vertical direction, and is fixed to the holding member 46 together with the GPS module 108. As the material of the noise shielding member 42, a metal having a relatively small electric resistance such as aluminum or copper is used.

  An opening 36 a that communicates the inside and the outside of the metal housing 30 is provided in the lower portion of the recess 36 of the metal housing 30. Moreover, the noise shielding member 42 and the holding member 46 have a hole 42a and a hole 46a at positions corresponding to the opening 36a, respectively. The FPC 40 (not shown in FIG. 7) is disposed so as to pass through the opening 36 a of the recess 36, the hole 42 a of the noise shielding member 42, and the hole 46 a of the holding member 46, and is disposed inside the metal housing 30. The circuit 130 is connected to the GPS module 108 disposed outside the metal housing 30.

  The GPS module 108 includes a circuit board 108a, a GPS antenna 108b, and an IC (Integrated Circuit) chip 108c. The GPS antenna 108b is an antenna that receives GPS satellite signals, and is mounted on the upper surface of the circuit board 108a. The IC chip 108c is mounted on the lower surface of the circuit board 108a. The GPS satellite signal received by the GPS antenna 108b is transmitted to the IC chip 108c via the circuit board 108a. The IC chip 108c performs predetermined signal processing on the GPS satellite signal and outputs it as a positioning signal. The positioning signal output from the GPS module 108 is transmitted to the system controller 100 in the camera body 10 via the FPC 40.

  The GPS module 108 is fastened together with the noise shielding member 42 together with the holding member 46 by screws, and is electrically connected to the noise shielding member 42. Further, the noise shielding member 42 is grounded to the metal housing 30 by a wiring 44 arranged so as to pass the opening 36 a of the recess 36, the hole 42 a of the noise shielding member 42, and the hole 46 a of the holding member 46. . Therefore, the GPS module 108 is grounded to the metal housing 30 via the noise shielding member 42 and the wiring 44. For the wiring 44, for example, a metal having a relatively small electric resistance such as a copper foil is used.

  Further, the GPS module 108 is disposed in the recess 36 of the metal housing 30 as described above. As a result, the lower and side surfaces of the GPS module 108 are covered with the metal housing 30. In the configuration shown in FIGS. 5 and 7, the lower side of the GPS module 108 and the side surface in the front-rear direction are covered with the recess 36.

  As described above, the electric circuit 130 including the system controller 100 and the like is disposed inside the camera body 10. When electromagnetic noise radiated from the electric circuit 130 enters the GPS antenna 108b, the operation of the GPS module 108 may be adversely affected. As an adverse effect, for example, the positioning accuracy by the GPS module 108 may be reduced. However, in this embodiment, since the electric circuit 130 is surrounded by the metal casing 30, electromagnetic noise generated in the electric circuit 130 is shielded by the metal casing 30 before being radiated to the outside. Therefore, it is possible to prevent electromagnetic noise from entering the GPS antenna 108b disposed outside the metal housing 30. Thereby, generation | occurrence | production of the bad influence to the GPS module 108 by electromagnetic noise can be suppressed.

  In addition, electromagnetic noise that may be incident on the GPS antenna 108b may be generated not only inside the photographing apparatus 1 but also outside the photographing apparatus 1. Examples of electromagnetic noise generated outside the photographing apparatus 1 include electromagnetic noise generated in surrounding electronic devices. Since the GPS satellite signal is transmitted from a satellite in the sky, the GPS satellite signal is incident on the photographing apparatus 1 from a relatively vertical position. On the other hand, electromagnetic noise generated in surrounding electronic devices often includes those that propagate from directions other than vertically above. In the present embodiment, the side surfaces (front and rear) of the GPS module 108 are covered with the metal casing 30 (recess 36). Therefore, most of the electromagnetic noise generated outside the photographing apparatus 1 is shielded by the metal housing 30 before entering the GPS antenna 108b.

  As described above, in the present embodiment, by arranging the GPS module 108 in the concave portion 36 outside the metal housing 30, electromagnetic noise generated inside and outside the photographing apparatus 1 (camera main body 10) It can suppress entering into 108b. In this embodiment, since the GSP antenna 108b is exposed at the upper part of the metal casing 30, the GPS satellite signal transmitted from the satellite in the sky is not shielded by the metal casing 30. For this reason, the positioning accuracy by the GPS module 108 is improved by the configuration of the present embodiment.

  In the present embodiment, since the GPS module 108 is grounded to the metal casing 30, the grounding capacitance of the GPS module 108 increases, and the ground voltage is stabilized. Thereby, the positioning accuracy by the GPS module 108 is improved. In the present embodiment, the GPS module 108 is grounded to the metal housing 30 via the noise shielding member 42 and the wiring 44. A material having a small electric resistance is used for the noise shielding member 42 and the wiring 44. Further, the copper foil used for the wiring 44 can be brought into contact with the metal housing 30 in a relatively large area. Therefore, in this embodiment, the electrical resistance (grounding resistance) between the GPS module 108 and the metal casing 30 is reduced as compared with the case where the GPS module 108 and the metal casing 30 are directly connected by a conductive wire. The ground voltage of the GPS module 108 is further stabilized.

  The noise shielding member 42 is disposed so as to cover the lower side of the GPS module 108. Since electromagnetic noise generated inside the photographing apparatus 1 is shielded by the concave portion 36 of the metal housing 30 and the noise shielding member 42, electromagnetic noise incident on the GPS antenna 108b is further suppressed.

  In addition, the metal housing 30 is provided with an opening 36 a that communicates the inside and the outside of the metal housing 30. Therefore, while preventing electromagnetic noise generated inside the metal housing 30 from entering the GPS antenna 108b, the electric circuit 130 (system controller 100) disposed inside the metal housing 30 and the metal The GPS module 108 disposed outside the housing case 30 can be easily connected via the opening 36a.

The above is the description of the exemplary embodiments of the present invention. Embodiments of the present invention are not limited to those described above, and various modifications are possible within the scope of the technical idea of the present invention. For example, the embodiment of the present invention also includes contents appropriately combined with embodiments or the like clearly shown in the specification or obvious embodiments.

  For example, in the above embodiment, as shown in FIG. 6, the rear of the recess 36 is formed higher than the upper surface of the GPS module 108, and the front is formed lower than the upper surface of the GPS module 108. Is not limited to this. For example, the recess 36 may be formed so that both the front and rear are higher than the upper surface of the GPS module 108. In this case, electromagnetic noise incident on the GPS antenna 108b from the front can be further suppressed.

  Further, in the above embodiment, as shown in FIG. 5, the recess 36 has a groove shape extending in the left-right direction, and the GPS module 108 is covered with the recess 36 only in the front-rear direction. Is not limited to this. For example, the recess 36 may have a bowl shape. In this case, since the GPS module 108 is covered with the recesses 36 in the front-rear and left-right directions, it is possible to further suppress electromagnetic noise generated outside the imaging apparatus 1 and entering the GPS antenna 108 b.

  Further, in the above embodiment, the housing of the camera body 10 has the metal housing 30 formed of a metal material, but the present invention is not limited to this. For the housing of the camera body 10, a material obtained by adding a conductive material such as metal powder to a non-conductive material (for example, a conductive resin) may be used instead of a metal material. Moreover, the housing of the camera body 10 may be formed of a non-conductive material such as a resin, and a conductive member (for example, a conductive tape) attached to the surface thereof. The housing of the camera body 10 may be formed of a non-conductive material such as a resin, and a conductive paint is applied on the surface thereof. The camera body 10 may be formed by bonding a conductive material such as a metal plate to a non-conductive material such as resin with a screw or an adhesive.

DESCRIPTION OF SYMBOLS 1 Image pick-up device 10 Camera body part 20 Interchangeable lens 30 Metal housing 31 Mount part 32 Grip 33 Resin members 35a-35c Housing member 36 Recess 36a Opening 40 FPC
42 Noise shielding member 42a Hole 44 Wiring 46 Holding member 46a Hole 100 System controller 102 Operation unit 102a Release switch 103 LED drive circuit 104 Drive circuit 108 GPS module 108a Circuit board 108b GPS antenna 108c IC chip 110 Shutter 112 Solid-state image sensor 114 Signal processing Circuit 116 Image processing engine 118 Buffer memory 120 Interface 122 for card 122 LCD control circuit 124 LCD
126 ROM
130 electric circuit 200 photographing lens 202 aperture 300 memory card

Claims (6)

A conductive member at least partially formed of a conductive material and disposed around an electronic circuit;
A wireless communication element disposed at a position where at least the wireless communication unit is exposed from the conductive member,
The electronic circuit is
And facilities predetermined signal processing on the signal output from the wireless communication device,
The wireless communication element is:
A circuit board on which the wireless communication unit is mounted;
It is arranged at a position exposed from the conductive member together with the circuit board,
The circuit board is
Grounded to the conductive member ;
Electronics. The conductive member is
Formed into a shell,
Having a recess formed by being recessed toward the inside of the conductive member;
The wireless communication element is:
Arranged in the recess,
The electronic device according to claim 1. A noise shielding member formed of a conductive material and disposed between the circuit board and the conductive member;
The circuit board is
Grounded to the conductive member through the noise shielding member,
The electronic device according to claim 1 or 2 . A non-conductive member made of a non-conductive material that covers the wireless communication part exposed from the conductive member;
The electronic device as described in any one of Claims 1-3 . The conductive member is
Having an opening communicating the inside and the outside of the conductive member;
The wireless communication element and the electronic circuit are connected through the opening.
The electronic device as described in any one of Claims 1-4 . A photographing optical system that is provided on the conductive member and forms a subject image;
An image sensor that captures the subject image and outputs an image signal;
Further comprising
The electronic circuit is
Processing the signal output from the wireless communication element and the image signal in association with each other;
The electronic device as described in any one of Claims 1-5 .

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