JPH054717Y2 - - Google Patents

Description

[Detailed Description of the Invention] The electronic device of the present invention will be explained according to the following items.

A. Field of industrial application B. Overview of the invention C. Background art D. Problem that the invention attempts to solve E. Means for solving the problem F. Example a. Appearance of tape recorder [Figures 1 and 2] b. Cassette Mounting part [Fig. 1, Fig. 2] c Mechanical chassis, reel engagement shaft [Fig. 1, Fig. 2]
Figure] d Speaker protection wall, partition wall, etc. [Figure 1, 3
Figures, Figure 4] e Resilient member [Figures 1 to 4] f Biasing of rotational force by the lid and resilient member [First
Figures to Figures 4] g Speaker [Figures 1 and 3] h Circuit board [Figures 1 and 4] i Contact between elastic member and mechanical chassis [Figure 1] G Effect of the invention (A Industry Field of Application) This invention relates to a new electronic device. For more information,
Tape recorders, radio receivers, transceivers and other various electronic devices, especially a circuit board on which semiconductors such as ICs are mounted, a speaker whose part is located close to the circuit board, and a predetermined storage section. This invention relates to an electronic device that includes a lid that opens and closes, a metal resilient member that biases the lid in a predetermined direction, and a metal mechanical chassis. Even if the static electricity charged by a person touching an electronic device is discharged between the speaker and the speaker, it is possible to reliably prevent the discharged static electricity from jumping into a semiconductor such as an IC mounted on a circuit board. The aim is to provide new electronic equipment.

(B Overview of the invention) The electronic device of the invention is arranged so that a circuit board on which semiconductors such as ICs are mounted and a sound emission hole formed in the housing are exposed, and a part of the circuit board is in close proximity to the circuit board. An electronic device comprising a speaker, a lid for opening and closing a predetermined opening of a housing, a metal resilient member for biasing the lid in a predetermined direction, and a metal mechanical chassis, The static electricity carried by a person who touches the outer surface of the electronic device, especially the part near the speaker, is grounded to the mechanical chassis via the speaker and the resilient member, and the static electricity is transferred to the circuit board via the speaker. It is designed so that it will not be added to the installed electronic components.

(C Background Art) Today, there are a wide variety of electronic devices,
In general, electronic equipment includes one or more mechanical chassis incorporating a predetermined mechanism, and one or more circuit boards on which a predetermined circuit is formed. Alternatively, they often include so-called semiconductor electronic components such as transistors.

and tape recorders and disk players,
Electronic devices such as radio receivers or transceivers usually have a speaker installed in their housing, and also have a so-called cassette storage section (or ``cassette mounting section'') for removably mounting a tape cassette in a tape recorder, for example. A portion with an opening is often provided, such as a disk storage section for removably mounting a disk in a disk player or a disk player. Furthermore, in electronic devices having such an opening, a lid for opening and closing the opening is usually provided, and the lid is moved in a predetermined direction, that is, in the direction in which the opening is opened and/or Alternatively, some resilient member is provided that biases it in the closing direction.

Nowadays, electronic devices are required to be more compact, and for this reason, the density of arrangement of components inside the housing of tape recorders and the like has become extremely high. Therefore, the aforementioned mechanical chassis, circuit boards, speakers, and other members are often arranged very close to each other.

(Problem to be solved by the invention D) By the way, a speaker installed inside the housing of an electronic device is generally arranged so as to close the sound emitting hole formed in the housing wall from the inside. Since it is supported by the housing wall, the speaker frame is positioned in contact with the housing wall from the inside.

Since many speaker frames are made of metal materials, if a person who touches the outer surface of the electronic device's case is charged with static electricity, that static electricity will often discharge onto the speaker frame. What happens happens.

In this case, if the members placed around the speaker are not affected by static electricity, there would not be much of a problem even if static electricity is discharged to the speaker, but as mentioned above, recently Since the density of component arrangement in electronic devices has become extremely high, it is not uncommon for speakers and circuit boards to be located close to each other.

Therefore, if static electricity is discharged to the speaker, it is likely that the static electricity will be discharged onto the circuit board.
There is a problem in that serious accidents such as jumping into semiconductors such as ICs cause so-called dielectric breakdown.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the electronic device of the present invention includes a resilient member, which is a member necessary for this type of electronic device, that is, the lid body. A part of the resilient member for biasing the speaker in a predetermined direction is brought into elastic contact with the metal part of the speaker, and the other part is brought into contact with the mechanical chassis.

Therefore, according to the present invention, static electricity discharged from outside the electronic device to the speaker falls on the mechanical chassis via the elastic member, so that the static electricity charges are transferred to semiconductors such as ICs on the circuit board. This effectively prevents these semiconductors from being destroyed by the static electricity.

(F. Embodiment) The details of the electronic device of the present invention will be described below according to the embodiment shown in the accompanying drawings.

The embodiment shown in the drawings is an example in which the present invention is applied to a tape recorder.

(a Appearance of tape recorder) [Figures 1 and 2] 1 is a relatively small tape recorder.

2 is a housing of the tape recorder 1;
A relatively thin box is formed by integrally joining an upper casing part 3 with an open bottom surface and a lower casing part 4 with an open top surface such that their respective opening surfaces are joined to each other. It is structured to form a
Further, most of the top surface of the casing 2 is constituted by a lid 5 for opening and closing a cassette mounting section, which will be described later, and most of the lid 5 is formed of a transparent plate.

6, 6, . . . are operation buttons whose front ends protrude slightly outward from button placement holes 8, 8, . 9 is a microphone (only a portion of which is shown in the drawings).

10 is a volume adjustment dial located such that a part of its outer circumference protrudes from the left side of the housing 2;
1 is an indicator consisting of a light emitting diode, etc.;
Reference numerals 2 and 12 denote jacks (only the tips thereof are shown in the drawing) into which external microphone plugs and earphone plugs are removably inserted.

A sound emitting hole 14 (see FIG. 1) consisting of a large number of small holes is formed at the right end of the bottom plate 13 of the lower housing part 4. It is attached so as to close it from the inside.

(b Cassette mounting section) [Figures 1 and 2] Reference numeral 15 denotes a cassette mounting section formed in the upper housing section 3, and the cassette mounting section 15 is a tape cassette called a "compact cassette" or the like. It is formed in the shape of a concave portion having approximately the same size. That is, the top plate 16 of the upper housing part 3 has an opening 1 having a substantially rectangular shape except for its right end and front end.
6a, and a cassette mounting plate 17 integrally formed with the upper housing part 3 is located slightly below the opening 16.
and a side wall 18 that connects the right end of the cassette mounting plate 17 and the top plate 16, and the cassette mounting plate 17.
A relatively shallow concave space is formed by the front walls 19, 19' that connect the left and right ends of the front edge of the top plate 16 and the upper end of the left side plate 20 of the upper housing part 3. A tape cassette (not shown) is removably installed in this space.
It's becoming 5.

At the front end of the cassette mounting plate 17, a notch 21 having a substantially trapezoidal shape when viewed from above and below is located at a portion corresponding to the portion between the front walls 19 and 19'.
are formed, and circular holes 22, 22' are formed spaced apart from each other in the left-right direction.

(c Mechanical chassis, reel engagement shaft) [Fig. 1,
[FIG. 2] Reference numeral 23 denotes a mechanical chassis formed of a sheet metal material into a substantially plate shape. Reel engaging shafts 24 and 24' are attached to the upper housing part 3 by being screwed to screw projections (not shown) attached thereto; The upper end of 24' is connected to the hole 2 formed in the cassette mounting plate 17 of the mechanical chassis 23.
2 and 22' so as to protrude upward from a position substantially corresponding to the central portion.

Therefore, the tape cassette is attached to the cassette mounting section 15.
When the cassette case is mounted on the cassette mounting plate 17, the upper ends of the reel engaging shafts 24 and 24' are respectively engaged with the two tape reels.

Although not shown, the mechanical chassis 23
Of these, the notch 2 formed in the cassette mounting plate 17
A magnetic head for recording/reproducing, an erasing head, a capstan, a tape running means such as a pinch roller, etc. are arranged in a portion substantially corresponding to 1.

(d Speaker protection wall, partition wall, etc.) [Figures 1, 3, and 4] 25 is a speaker protection wall formed in the upper housing part 3, and the speaker protection wall 25 is approximately It has a semicircular arc shape, and is positioned such that approximately half of the left side thereof protrudes downward from a portion slightly toward the front of the center portion in the front-rear direction of the right end portion of the cassette mounting plate 17, and Approximately half of the right side thereof is positioned so as to protrude downward from the inner surface of the top plate 16, and its lower end is positioned at approximately the same height as the lower opening surface of the upper housing section 3. .

Reference numeral 26 denotes a protrusion piece formed to protrude downward from a position slightly rearward from the center in the front-rear direction of the right end of the cassette mounting plate 17, and the protrusion piece 26 is attached to the speaker protection wall. It is located approximately on the circumference of a circle including arc 25, and its height is approximately equal to the height of the left half of the speaker protection wall 25.

Therefore, the speaker protection wall 25 and the protruding piece 26 define a space that is generally cylindrical as a whole.
A magnet section of a speaker, which will be described later, is arranged in this space with some allowance.

27 is located downward from a portion of the portion along the right edge of the lower surface of the cassette mounting plate 17 between the protruding piece 26 and the approximately central portion between the protruding piece 26 and the rear plate 28 of the upper housing portion 3. The first partition wall 27 is a first partition wall formed to protrude toward the projection 26, and the first partition wall 27 has a height approximately half of the height of the protruding piece 26.

29 is a second partition wall formed to protrude downward from the inner surface of the top plate 16;
The partition wall 29 is formed to have a substantially L shape when viewed from below, and its front end is continuous with the rear end of the speaker protection wall 25, and its right end is connected to the right side plate 30 of the upper housing section 3. It is continuous, and its height is approximately the same as the height of the speaker protection wall 25.

At the right edge of the cassette mounting plate 17 and at the rear end of the side wall 18 continuous thereto, there is a leg arrangement hole 31 extending along the front-rear direction and having a substantially crank-shaped bent portion at its substantially central portion. is formed, and also the top plate 1
A lid support piece 32 protrudes downward from a position corresponding to the rear end of the right edge of the leg placement hole 31 on the inner surface of the leg piece arrangement hole 31 .

Reference numeral 33 denotes a positioning projection that projects downward from a substantially central portion of the lower surface of the cassette mounting plate 17 between the portion near the left end of the speaker protection wall 25 and the protruding piece 26.

Reference numeral 34 designates a screw-fastening protrusion that protrudes downward from a position on the inner surface of the top plate 16 adjacent to the front end of the second partition wall 29 from the left side.

(e Resilient member) [Figures 1 to 4] Reference numeral 35 denotes an elastic member made of a plate spring material, and the elastic member 35 is made up of the following parts integrally formed. .

That is, 36 is a mounting portion of the resilient member 35, and the mounting portion 36 is formed into a substantially crank shape when viewed from below, and an intermediate piece 36a forming the middle portion of the crank shape.
A screw insertion hole 37 is formed at the right end of the front piece 36b, and a positioning hole 38 is formed approximately at the center of the front piece 36b.

Reference numeral 39 denotes a resilient part of the resilient member 35, and the resilient part 39 extends downward from the rear end of the rear piece 36c of the attachment part 36, and is bent rearward from its lower end at a substantially right angle. The continuous piece 39a and the continuous piece 3
It consists of a pressing piece 39b that extends generally upward from the rear end of 9a and is bent in a substantially dogleg shape when viewed from the left side, and the upper end of the pressing piece 39b is slightly higher than the mounting part 36. extends to the position.

40 and 40' are speaker contact portions of the resilient member 35. The speaker contact parts 40 and 40' extend from the front end and the rear end of the front end piece 36b of the mounting part 36 so as to be bent in a substantially L shape, and are continuous with the front end piece 36b and separate from the front end piece 36b. Continuous pieces 40a, 40'a, which extend obliquely so as to be gradually displaced downward, and extend rearward and forward, respectively, from the tips of the continuous pieces 40a, 40'a, forming a substantially L-shape; Contact pieces 40b, 40' extend so as to be folded back toward the base end side, and gradually displace downward as they go toward the tip.
b, therefore, the contact pieces 40b and 40'
b are positioned so as to extend substantially parallel to each other when viewed from below, and are positioned somewhat lower than the mounting portion 36.

Reference numeral 41 designates a grounding portion of the resilient member 35, and the grounding portion 41 is a continuous piece 41a that extends from the left end of the intermediate piece 36a of the attachment portion 36 toward the left side, and gradually displaces downward as it approaches the tip. The continuous piece 41
and a contact piece 41b extending rearward from the tip of a.

Then, the elastic member 35 formed in this way
As can be clearly seen from FIGS. 1 and 4, the positioning protrusion 3 formed on the cassette mounting plate 17 is inserted into the positioning hole 38 formed on the mounting portion 36.
3 is inserted through the screw insertion hole 37, and the screw 42 inserted into the screw insertion hole 37 is screwed into the screw fixing protrusion 34, thereby being attached to the upper housing portion 3.

Therefore, the resilient member 35 is located at approximately the front portion thereof, that is,
Front piece 36b of mounting portion 36 and speaker contact portion 4
0 and 40' are the speaker protection wall 25 and the projecting piece 2
6, and its resilient portion 39 is located at the back of the substantially cylindrical space defined by the first,
Second, the upper end of the pressing piece 39b of the resilient part 39 is located between the two partition walls 27 and 29, and as can be clearly seen from FIGS. It is positioned so as to protrude upward from the hole 31. Further, the contact piece 41b of the ground portion 41 of the resilient member 35 is positioned so as to approach the protruding piece 26 from approximately the left side.

(f) Biasing of rotational force by the lid and elastic member [Figs. 1 to 4] The length of the lid 5 in the left-right direction is approximately equal to the length of the housing 2 in the left-right direction, and The leg placement hole 31 is formed into a substantially rectangular plate shape whose length in the front and back direction is slightly shorter than the length in the front and back direction of the housing 2, and is formed in the upper housing part 3 at the rear end. A relatively large leg piece 43, which has an approximately triangular shape as a whole when viewed from the side, is provided to protrude downward at a position corresponding to the position, and a relatively small leg piece 44 (second (see figure) protrudes downward. Of the two leg pieces 43 and 44, the one on the right side 43
The rear end portion is rotatably supported by the support piece 32 formed on the upper housing portion 3, and the smaller left leg piece 44 is supported on the rear end portion of the left side plate 20 of the upper housing portion 3. It is rotatably supported upward, and thereby the lid body 5 is rotatably supported by the upper housing part 3.

The lid 5 is shown in solid lines in FIG. 1 and is positioned in the position shown in FIG.
(hereinafter referred to as the "closed position") and the position shown in FIG. 1 by the two-dot chain line and shown in FIG. (referred to as the "open position").

A pressed portion 45 having a substantially circular shape when viewed from the side is protruded from a position near the lower end of the right leg piece 43, and the resilient member 35 is provided on the pressed portion 45.
The pressing piece 39b of the resilient part 39 is brought into elastic contact from the front side.

As can be clearly seen from FIG. 1, the resilient portion 39 of the resilient member 35 is attached to the pressed portion 45 of the leg piece 43
The dogleg-shaped bending point 39 of the pressing piece 39b
When the lower part from b' is in elastic contact, the pressing piece 39b presses the pressed part 45 substantially backward and diagonally downward. The rotational force is applied, and as a result, the state in which the lid body 5 is in the closed position is maintained. From this state, the lid body 5 is rotated clockwise, and the pressed part 45 of the leg piece 43 is moved from the bent point 39b' of the pressing piece 39b of the resilient member 35 to the upper side. When the portions reach the position where they come into elastic contact, the pressing piece 39b presses the pressed portion 45 diagonally upward toward the rear, so that a clockwise rotational force is applied to the lid 5. As a result, the lid body 5 is maintained in the open position.

Note that the lower part of the leg piece 43 on the right side of the lid body 5 is connected to the leg piece placement hole 31 when the lid body 5 is in the closed position.
It is positioned so as to protrude downward from the top.

(g Speaker) [Figures 1 and 3] 46 is a speaker. The speaker 46 is positioned so as to close the sound emitting hole 14 formed in the bottom plate 13 from the inside, and is fixed to the lower housing part 4 by screwing the frame 47 to the bottom plate 13 at several locations. ing. Reference numeral 48 denotes a magnet portion positioned so as to protrude upward from the upper surface of claim 47, and the magnet portion 48 has a substantially cylindrical shape with its upper end surface closed in appearance;
A voice coil, a yoke, a magnet, etc. (not shown) are provided inside.

The speaker 46 is disposed at the right end inside the housing 2 by integrally joining the upper housing part 3 and the lower housing part 4, and as shown in FIG. As can be seen, the speaker contact portion 40 of the resilient member 35 is located on the upper end surface of the magnet portion 48.
The contact pieces 40b and 40'b of 40' come into elastic contact, and this elastic force forces the speaker 46 against the bottom plate 13 of the lower housing section.

In this way, since the speaker 46 is pressed against the bottom plate 13 by the speaker contact portions 40 and 40' of the resilient member 35, the frame 4
It is possible to suppress chatter caused by the vibration generated in the housing 7 and the inertia of the housing 2.

(h Circuit board) [FIGS. 1 and 4] Reference numeral 49 denotes a circuit board supported by the upper housing portion 3 in a state where it is positioned so as to substantially cover the lower surface thereof. The circuit board 49 has a relatively large notch 49a formed in its front part except for the right end, the upper surface of which is a so-called mounting surface, and the lower surface thereof is a so-called pattern forming surface.

Insertion holes 50 and 50' are formed at a position slightly to the right of the center part in the left-right direction of the circuit board 49 and at a position approximately at the center between the center part and the left end, and the insertion holes 50 and 50' are formed through the right side edge and the above-mentioned insertion hole. A substantially keyhole-shaped hole 51 is formed between the hole 50 and the hole 50 .

52, 52' are ICs mounted on the pattern forming surface
53 is a ground conductor formed on the pattern forming surface (in the drawing, only the ground conductor located at the outer periphery of the pattern forming surface is shown).

The circuit board 49 has the jack 1 described above.
2 and 12 and a large number of electronic components and conductors (not shown) are provided.

As can be clearly seen from FIGS. 1 and 4, the circuit board 49 is located at approximately the same height as the lower surface of the upper housing portion 3, and the circular portion of the keyhole-shaped hole 51 is The speaker protection wall 25 and the protruding piece 26 are fixed to the upper housing part 3 at several locations so as to be fitted onto the lower ends thereof.

By the way, as described above, when the upper housing part 3 and the lower housing part 4 are integrally combined, the speaker 4
Since the magnet part 48 of No. 6 is located in the approximately cylindrical space defined by the speaker protection wall 25 and the protruding piece 26, the speaker 46 is located in the keyhole-shaped hole 51 formed in the circuit board 49. The magnet portion 48 is inserted relatively therethrough, and therefore, the portion of the circuit formed on the circuit board 49 located around the hole 51 is located close to the speaker 46.

(i. Contact between resilient member and mechanical chassis) [1st
On the other hand, when the mechanical chassis 23 is attached to the upper housing section 3, the contact piece 41b of the ground section 41 of the resilient member 35 comes into contact with the mechanical chassis 23. That is, the mechanical chassis 23 is attached to the upper housing part 3 after the elastic member 35 is attached to the upper housing part 3 as described above. 1, a part of the mechanical chassis 23 comes into contact with the contact piece 41b from below, as can be clearly seen from FIG. Thereby, the speaker 46 is electrically connected to the mechanical chassis 23 via the resilient member 35.

Therefore, if a person charged with static electricity touches the outer surface of the outer casing 2 of the tape recorder 1, especially the part of the bottom plate 13 where the sound emitting holes 14 are formed, the static electricity will be applied to the frame 47 of the speaker 46. Although the frame 47 of the speaker 46 may be discharged,
The static electricity discharged from the magnet section 48 is transferred to the speaker contact section 40, 40' of the resilient member 35.
It flows in the order of attachment part 36 - grounding part 41 and is grounded from contact piece 41b of grounding part 41 to mechanical chassis 23 .

Therefore, even if the static electricity charged by a person touching the housing 2 is discharged to the speaker 46, the static electricity will not fall on the circuit or IC formed on the circuit board 49, and therefore, such static electricity will not fall on the circuit or IC formed on the circuit board 49. Semiconductors such as ICs will not be destroyed by static electricity.

(G Effect of the invention) As is clear from the above description, the electronic device of the invention has a circuit board on which semiconductors such as ICs are mounted, and a sound emission hole formed in the casing.
a speaker disposed so that a portion of the speaker is close to the circuit board; a lid that opens and closes a predetermined opening of the housing; and a metal elastic member that biases the lid in a predetermined direction. , an electronic device equipped with a mechanical chassis made of metal, characterized in that a part of the elastic member is brought into elastic contact with the metal part of the speaker, and another part is brought into contact with the mechanical chassis.

Therefore, according to the present invention, the static electricity discharged to the speaker from outside the electronic device falls on the mechanical chassis via the elastic member, so the static electricity charge is not added to the circuit board.
Semiconductors such as ICs mounted on the circuit board will not be destroyed by the static electricity.

Furthermore, the above-mentioned resilient member is a member that is necessary for electronic equipment that is equipped with a lid that opens and closes a predetermined storage section, and the present invention utilizes such a necessary member. It is possible to prevent semiconductors such as ICs from being destroyed by static electricity discharged to the speaker from outside the device without providing any special components.

Furthermore, if the part of the elastic member that contacts the speaker is brought into elastic contact with the end face of the speaker on the side opposite to the housing wall, the speaker can be pressed against the housing wall, so that the speaker can be operated. Therefore, it is possible to suppress the so-called "chattering" caused by this, and it is possible to suppress the so-called "chattering" caused by It can have three functions: a function to suppress chatter.

In the above-mentioned embodiment, the present invention was applied to a tape recorder, but the present invention is not limited to such an example of application, and can be applied to a circuit board on which a semiconductor such as an IC is mounted, and the like. A speaker, a portion of which is located close to the circuit board, a lid that opens and closes a predetermined storage section, a metal elastic member that biases the lid in a predetermined direction, and a metal mechanical chassis. Furthermore, the mechanical chassis itself does not need to be made of metal; if the mechanical chassis is made of a non-conductive material, it can be applied to various electronic devices equipped with a conductor. It is also conceivable to provide a section so that a part of the resilient member comes into contact with the conductor.

[Brief explanation of the drawing]

The drawings show an example of an implementation in which the electronic device of the present invention is applied to a tape recorder, and FIG. 1 is an enlarged vertical cross-sectional view, and FIG. 2 is an enlarged perspective view of the whole with the lid in the open position. , Figure 3 is an exploded perspective view,
FIG. 4 is a bottom view with the lower casing section removed. Explanation of symbols, 1... Electronic equipment, 2... Housing, 5
...Lid body, 14...Sound emission hole, 23...Mechanical chassis, 35...Bulging member, 40, 40'...Other part (of the bouncing member), 41...(Bulking member) Part, 46...Speaker, 49...Circuit board, 5
2,52'...IC.

Claims (1)

[Scope of Claim for Utility Model Registration] A circuit board on which a semiconductor such as an IC is mounted, and a speaker arranged so as to face a sound emitting hole formed in the housing and a part of it is close to the circuit board. , an electronic device comprising: a lid that opens and closes a predetermined opening of a housing; a metal resilient member that urges the lid in a predetermined direction; and a metal mechanical chassis, the resilient member An electronic device characterized in that a part of the speaker is in elastic contact with a metal part of the speaker, and another part is in contact with a mechanical chassis.