JP5606035B2 - Noise reduction device - Google Patents

Description

  The present invention relates to a noise reduction apparatus incorporated in an electronic device such as a notebook personal computer (hereinafter simply referred to as “notebook personal computer”) equipped with a camera device.

  As is well known, in recent years, electronic devices such as notebook personal computers equipped with a camera device have become widespread. In particular, for notebook computers and the like that require portability, in order to ensure robustness, the number of cases in which the casing is manufactured by molding using a metal material such as magnesium (Mg) is increasing. Is coming.

  A camera device provided in an electronic device is generally mounted on a module substrate (camera module substrate) on which a camera drive circuit that drives and controls the camera device is mounted. During the operation of the camera device, radio wave noise is radiated (radiated) from the camera drive circuit. That is, the camera drive circuit on the camera module substrate has one surface as a kind of noise source in terms of radio waves.

  By the way, in recent years, electronic devices having a function of wireless communication with the outside have become widespread. For example, notebook computers and the like have many built-in antennas for wireless communication for wireless communication with the outside. Is coming. In many cases, for example, a display module substrate mounted with a display drive circuit that drives and controls the display operation of the display panel is attached to a display panel provided in an electronic device such as a notebook computer.

  Therefore, when the camera device is provided in an electronic device, radio wave interference between the camera drive circuit of the camera device and the wireless communication antenna and the display drive circuit of the display panel incorporated in the same electronic device becomes a problem. . That is, there is a problem that noise radiated from the camera drive circuit adversely affects the antenna characteristics (particularly reception sensitivity) of the wireless communication antenna and the display characteristics of the display panel. In addition, even if it is not built in the same electronic device, there is a problem that other electronic devices such as a mobile phone existing in the vicinity of the electronic device may adversely affect its operation characteristics. is there.

  In order to solve this problem, there is known a method for reducing noise by covering a camera module substrate on which a camera driving circuit as a noise source is mounted with a conductive tape or the like. For example, in Patent Document 1, a sheet-like radiation noise suppression body including a conductive layer made of conductive fibers, a conductive sheet, or the like is attached to the upper surface of a CPU mounted on a circuit board, and is emitted from the circuit board. A configuration for reducing noise is disclosed.

JP 2000-133986 A

  However, in the conventional method of covering the camera module substrate with the conductor tape or the like, it takes time to attach the conductor tape or the like, and in addition to covering the substrate with the conductor, an insulator is applied to the substrate. There is a problem in that it is necessary to install, resulting in an increase in the number of parts and a further increase in work man-hours.

  The present invention has been made in view of such technical problems, and provides a noise reduction device capable of suppressing the influence of noise radiated from a camera drive circuit of a camera device included in an electronic device on the surroundings with a relatively simple configuration. The basic purpose is to do.

For this reason, the noise reduction device according to the present invention is a noise reduction device incorporated in an electronic device in which a drive circuit board of a camera device is arranged inside a metal casing, and is formed integrally with the metal casing and A conductive frame that surrounds the periphery of the drive circuit board, and the metal housing and the conductive frame form a recess for housing the drive circuit board, and the conductive frame includes the conductive frame A pair of conductive passage walls are provided to form a passage that leads to the outside of the frame body from an opening formed by cutting out a part of the conductive frame body, and is disposed across the pair of conductive passage walls. And a conductive sealing member surrounding the cable connected to the drive circuit board through the passage in cooperation with the conductive passage wall and the conductive passage bottom, and the metal housing includes an outer plate, A base frame facing the outer plate, Kigaiban includes a back panel, and an upper cover which is joined to the upper portion of the rear panel, of the metal housing, the conductive frame and the portion where the top cover is opposed to the base frame A conductive passage wall is formed, a liquid crystal panel is disposed between the back panel and the base frame, and the conductive sealing member is a gasket formed of a highly flexible material. It is a thing.

According to the present invention, by housing the drive circuit board in a recess formed by a conductive frame body and a metal casing surrounding the periphery of the drive circuit board of the camera device, noise from the drive circuit board is reduced. Radiation to the outside of the recess can be effectively suppressed. In other words, with a relatively simple configuration in which only a conductive frame formed integrally with a metal casing is provided, noise from the drive circuit of the camera device is radiated to the outside of the recess and adversely affects the surroundings. This can be effectively suppressed. The cable connected to the drive circuit board of the camera device through the passage formed from the opening formed by cutting out a part of the conductive frame to the outside of the frame includes: a conductive passage wall that forms the passage; Since the inside of the passage is surrounded by the bottom of the conductive passage and the conductive sealing member, it is possible to effectively suppress noise from being radiated to the outside of the conductive frame from the passage portion through which the cable passes.

The whole perspective view which shows the usable state of the notebook computer concerning an embodiment Overall perspective view showing the notebook PC not in use Top view of the notebook computer when not in use Side view of the notebook computer when not in use The exploded perspective view which shows roughly the structure of the 1st housing | casing of the said notebook personal computer. The enlarged front view which expands and shows the camera module board mounting part of the said 1st housing | casing The enlarged perspective view which expands and shows the said camera module board attachment part The enlarged front view which expands and shows the state which attached the said camera module board | substrate The enlarged front view which shows the state which attached the gasket under the said camera module board | substrate. Longitudinal sectional view along line Y10-Y10 in FIG.

The noise reduction device of the present invention can take the following aspects based on the above-described configuration. That is, in the noise reduction device having the above-described configuration, the conductive passage wall is a pair of a plurality of parallel projecting pieces formed on the upper cover, and the conductive sealing member is the conductive passage wall. In addition to the above, it is preferable that the plurality of protruding pieces are disposed across the plurality of protruding pieces .

In this case, the conductive sealing member can be stably arranged across a number of protruding pieces in addition to the conductive passage wall.

(Embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, taking a so-called notebook computer as an example.
In the following description, terms meaning a specific direction (for example, “up”, “down”, “left”, “right”, and other terms including them, “clockwise direction”, “counterclockwise” ”) Is used to facilitate understanding of the invention with reference to the drawings, and the present invention should not be construed in a limited manner by the meaning of these terms. Absent.

  1 and 2 are perspective views showing a usable state (open state) and a non-use state (closed state) of the notebook computer according to the present embodiment, respectively. 3 and 4 are a plan view and a side view of the notebook personal computer when not in use.

  As shown in these drawings, a notebook personal computer W as an information processing apparatus according to this embodiment includes, for example, a display unit 10 having a liquid crystal display panel screen, and a display signal input to the display unit 10. And an operation control unit 30 that can be generated. The operation control unit 30 includes an input device 32 such as a keyboard, a signal processing circuit that generates a display signal to be output to the display unit based on an input operation by the input device 32, a central processing unit (so-called CPU), These peripheral parts (all not shown) are included. Further, a touch pad 33 is provided on the front side of the keyboard 32 when viewed from the user when the user (user) operates the notebook computer W, and the user traces the touch pad 33 in the vertical and horizontal directions. Only the cursor can be moved, the display screen 12 can be scrolled, and the like.

The display unit 10 is housed in a display unit side housing 11 (first housing), and the periphery and back surface thereof are covered, while the control operation unit 30 includes an operation control unit side housing 31 (first housing). The two casings 11 and 31 are coupled to each other by the hinge mechanism 20 so as to be opened and closed.
More specifically, both the first housing 11 and the second housing 31 are formed in a substantially rectangular shape as a whole in plan view, and the sides 11r and 31r side (that is, the user takes note The two housings are opened / closed relative to each other about the hinge shaft 21 (see FIG. 4) by connecting the rear side (viewed from the user as viewed from the user in the operation state of operating the personal computer W) via the hinge mechanism 20. It can be operated. In the present specification, the “rectangular shape” includes a case of “square” as one form thereof.

  FIG. 5 is an exploded perspective view schematically showing the configuration of the first housing 11. As shown in this figure, the first housing 11 includes a base frame 14 having a quadrilateral frame shape when viewed from the front, a back panel 15 disposed to face the base frame 14, and an upper portion of the back panel 15. It is comprised with the upper cover 16 joined. Note that a cover body 25 (hinge cover) of the hinge mechanism 20 is integrally formed at both left and right ends of the base frame 14 on the base end side. The hinge cover 25 may be provided separately from the base frame 14. The front surface portion of the frame of the base frame 14 is a so-called escutcheon portion 14 a that is an edge portion located between the outer edge of the first housing 11 and the glass plate of the display screen 12 in the assembled state of the display unit 10. It plays the role of a kind of decorative board.

The liquid crystal panel 18 whose surface is covered with a glass plate is held between the base frame 14, the back panel 15 and the upper cover 16. The outer panel 17 (outer panel) of the first housing 11 is configured by integrally joining the back panel 15 and the upper cover 16.
Further, a display module substrate Sd on which a display driving circuit for driving and controlling the display is mounted is attached to the lower end side of the liquid crystal panel 18.

  The back panel 15 is preferably made of metal such as magnesium (Mg), for example, in terms of mechanical rigidity, and the base frame 14 is preferably made of plastic, for example. The upper cover 16 is made of plastic, for example, including the ceiling panel 16a, and the other part is made of metal such as magnesium. The main part of the second casing 31 is also preferably made of a metal such as magnesium, for example, in terms of mechanical rigidity.

  In the present embodiment, an antenna An for wireless communication with the outside is attached to the first housing 11 side. As this radio communication antenna An, a thin and compact antenna having an antenna pattern formed on a substrate (antenna substrate) is employed. Note that, when the wireless communication antenna An is attached to the casing of the notebook personal computer W, in order to ensure better antenna characteristics, in general, the second casing on the side of the operation control unit on which the user's fingers are easily touched during use. It is preferable to attach to the first housing 11 on the display unit side rather than 31.

  Further, when the antenna is attached to the first housing 11 on the display unit side, the display module substrate becomes larger as the distance of the antenna substrate An from the liquid crystal panel 18 (that is, the distance of the liquid crystal panel 18 from the display module substrate Sd) is kept larger. It is known that a better antenna characteristic can be obtained by moving away from a display drive circuit as a noise generation source mounted on Sd.

  For this reason, in this embodiment, the ceiling panel 16a of the upper cover 16 located at the end of the first housing 11 on the other side 11f side (see FIGS. 1 and 4) facing the one side 11r side (hinge side). An antenna substrate An is arranged along the inner surface of the antenna. In the present embodiment, the four antenna substrates An are arranged so as to extend in parallel along the plastic ceiling panel 16a of the upper cover 16, and are attached to the inner surface of the ceiling panel 16a by applying an adhesive, for example. It has been.

  The portion of the upper cover 16 excluding the ceiling panel 16a is made of metal such as magnesium (Mg), for example, and the antenna substrate An is located near the side end via a metal clip fitting (not shown). Connected to the metal portion of the upper cover 16 and grounded. The clip metal fitting holds the vicinity of the connection end of an antenna cable (not shown) connected to the antenna element on the antenna substrate An.

  In the present embodiment, the camera device Cm is arranged in a region located between the two central antenna plates An. The camera device Cm is mounted on a module substrate Sc (camera module substrate) on which a camera drive circuit (not shown) that drives and controls the camera device Cm is mounted. The camera module substrate Sc is formed in a rectangular plate shape when viewed from the front. A lens opening 14h for facing the lens of the camera device Cm is provided at the upper center of the escutcheon portion 14a of the base frame 14 of the first housing 11 corresponding to the position where the camera device Cm is disposed. ing.

  6 and 7 are an enlarged front view and an enlarged perspective view, respectively, showing the attachment portion of the camera module substrate Sc of the first housing 11 in an enlarged manner, and FIG. 8 shows a state in which the camera module substrate Sc is attached to the attachment portion. 9 is an enlarged front view, FIG. 9 is an enlarged front view showing a state where a conductive gasket is mounted below the camera module substrate Sc, and FIG. 10 is a longitudinal section taken along line Y10-Y10 in FIG. FIG.

  6 and 7, the area located between the two antenna substrates An in the center in the front view, that is, in the vicinity of the ceiling panel 16a of the upper cover 16 of the first housing 11, that is, the camera device Cm. A substrate accommodating recess 40 for accommodating the camera module substrate Sc is provided in a region corresponding to the arrangement position of. More preferably, the substrate housing recess 40 is integrally formed with a metal portion of the upper cover 16, and in a front view that surrounds the bottom wall portion 41 that is the wall portion of the upper cover 16 and the periphery of the camera module substrate Sc. It is comprised with the rectangular-shaped frame part 42. FIG. A plurality of fixing boss portions 41 b for fastening and fixing the camera module substrate Sc using screw members 39 (see FIGS. 8 and 9) are provided upright on the bottom wall portion 41.

The frame body part 42 includes an upper wall part 42a adjacent to the ceiling panel 16a, a lower wall part 42b extending in parallel to face the upper wall part 42a, the lower wall part 42b, and the upper wall part 42a. The left and right side walls 42c and 42d are connected to each other.
8 and 9, the camera module substrate Sc is accommodated in the substrate accommodating recess 40 by screwing the screw member 39 into the fixing boss 41b after being accommodated in the substrate accommodating recess 40. That is, it is fixed (in a recess 40 formed by a bottom wall portion 41 made of a metal portion of the top cover 16 and a conductive frame portion 42 formed integrally with the metal portion of the top cover 16). .

  As described above, the camera is placed in the substrate housing recess 40 formed by the bottom wall portion 41 formed of the metal portion of the top cover 16 and the conductive frame portion 42 integrally formed with the metal portion of the top cover 16. By housing the camera module substrate Sc of the device Cm, it is possible to effectively suppress noise from the camera module substrate Sc from being radiated to the outside of the substrate housing recess 40. That is, the noise from the camera module substrate Sc of the camera device Cm can be reduced with a relatively simple configuration in which only the conductive frame portion 42 formed integrally with the metal portion of the upper cover 16 of the first housing 11 is provided. It is possible to effectively suppress radiation to the outside of the recess 40 and adversely affecting the surroundings.

  That is, noise radiated from the camera module board Sc of the camera device Cm is caused by the antenna characteristics (particularly reception sensitivity) of the wireless communication antenna An built in the same notebook computer W, the display characteristics of the liquid crystal panel 18, and For other electronic devices such as mobile phones that exist in the vicinity of the notebook personal computer W, it is possible to effectively suppress adverse effects on the operation characteristics and the like.

  In addition, an opening 42h is formed in the lower wall portion 42b constituting a part of the frame body portion 42 of the substrate housing recess 40 by cutting out a part thereof. On the outside of the lower wall portion 42b, a large number of parallel projecting pieces 43 formed integrally with the lower wall portion 42b extend outward. The large number of projecting pieces 43 improve the conduction of the gasket 50 described later and the mechanical strength of the lower wall portion 42b of the substrate housing recess 40. The central two pieces 43c of the projecting pieces 43 are extended outward from the left and right edges of the opening 42h, and form a pair of passages 44 that lead from the opening 42h to the outside of the frame 42. A conductive passage wall 43c is formed.

A cable pedestal 44b on which a cable 49 (so-called interface cable) connected to the camera module board Sc of the camera device Cm is mounted at the bottom of the passage 44 is integrated with a metal portion of the upper cover 16 of the first housing 11. Molded.
Further, on the outside of the left and right extension part 42e of the lower wall part 42b, a gasket mounting part 45 on which a conductive gasket 50 as a conductive sealing member is placed is a metal part of the upper cover 16 of the first housing 11. And is integrally molded.

  In this embodiment, as shown in FIGS. 9 and 10, a conductive gasket 50 is formed so as to straddle a pair of conductive passage walls 43 c forming a passage 44 that leads from the opening 42 h to the outside of the frame body 42. Is arranged. The conductive gasket 50 is made of a highly flexible material such as rubber or soft resin to which conductivity is imparted, and is preferably hollow so as to be elastically deformed against a pressing force, as shown in FIG. It is formed in a shape. The conductive gasket 50 is connected to the camera module board Sc through the passage 44 in cooperation with the conductive passage wall 43c, the plurality of protruding pieces 43 and the conductive passage base 44b. The cable 49 is surrounded.

  As described above, the cable connected to the camera module substrate Sc of the camera device Cm through the passage 44 communicating from the opening 42h formed by cutting out a part of the conductive frame 42 to the outside of the frame 42. 49 is surrounded by the conductive passage wall 43c, the conductive passage pedestal 44b and the conductive gasket 50 forming the passage 44 in the passage 44, so that noise is generated from the portion of the passage 44 through which the cable 49 passes. Radiation to the outside of the body part 42 can also be effectively suppressed.

  The above description has been made with a notebook personal computer as an example. However, the present invention is not limited to such a case, and various other types in which the drive circuit board of the camera device is disposed inside the metal casing. The present invention can also be effectively applied to a noise reduction device incorporated in an electronic apparatus.

  Thus, it goes without saying that the present invention is not limited to the above-described embodiments and modifications, and various changes and design improvements can be made without departing from the scope of the invention. Yes.

  The present invention can be effectively used as a noise reduction device in an electronic device such as a notebook personal computer.

DESCRIPTION OF SYMBOLS 11 1st housing | casing 16 Upper cover of 1st housing | casing 18 Liquid crystal panel 40 Substrate accommodation recess 41 Bottom wall part 42 Frame part 42h Opening part of frame part 43c Passage wall 44 Passage 44b Base of passage 45 Gasket mounting part 49 Interface cable 50 Conductive gasket Cm Camera device Sc Camera module board W Notebook computer

Claims (2)

A noise reduction device incorporated in an electronic device in which a drive circuit board of a camera device is arranged inside a metal casing,
A conductive frame formed integrally with the metal casing and surrounding a periphery of the drive circuit board;
The metal housing and the conductive frame form a recess for accommodating the drive circuit board,
The conductive frame body is provided with a pair of conductive passage walls that form a passage from the opening formed by cutting out a part of the conductive frame body to the outside of the frame body,
A conductive seal disposed across the pair of conductive passage walls and surrounding a cable connected to the drive circuit board through the passage in cooperation with the conductive passage walls and the bottom of the conductive passage. Further comprising a member,
The metal casing has an outer plate and a base frame facing the outer plate,
The outer plate has a back panel and an upper cover joined to an upper portion of the back panel ,
The conductive frame and the conductive passage wall are formed at a position of the metal casing where the upper cover faces the base frame,
A liquid crystal panel is disposed between the back panel and the base frame,
The conductive sealing member is a gasket formed of a highly flexible material.
The noise reduction apparatus characterized by the above-mentioned. The conductive passage wall is a pair of a plurality of parallel protruding pieces formed on the upper cover,
The conductive sealing member is disposed across the multiple protruding pieces in addition to the conductive passage wall.
The noise reduction device according to claim 1.

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