JPH0745919Y2 - Electronic device housing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a structure of a housing suitable for an electronic device including a microcomputer and a storage element.

(Prior Art) For example, in a printer, a control circuit including a printing mechanism that executes printing while conveying a print sheet, a microcomputer that analyzes a signal input from an external device and controls the printing mechanism, and a storage element Is built in one housing.

Therefore, there is a problem in that static electricity is generated due to the friction generated when the printing paper is conveyed, and this static electricity gets around to the control circuit and causes a malfunction.Usually, measures are taken to quickly discharge the static electricity by connecting the printing mechanism to the ground. Has been.

(Problems to be solved) Since the printing mechanism and the control circuit are electrically separated from each other, as shown in FIG. 4, a conductive material is used between the frame A on which the printing mechanism is assembled and the main plate B forming the shield. Screw C
However, there is a problem that screwing work and wire connection work are required.

The present invention has been made in view of such a problem, and the object thereof is a casing structure capable of performing a ground connection between a mechanical device section and an electronic circuit section without requiring a special connection. Is to provide.

(Means for Solving the Problem) In order to solve such a problem, in the present invention, a conductive base plate incorporated in the bottom of a housing so that at least one end is cantilevered, and a conductive material. And a frame for assembling a mechanical system, the leg having a length that abuts on the cantilever portion of the conductive ground plate to elastically deform the cantilever portion when assembled in the housing. And a member.

(Operation) Since the legs are elastically contacted with the ground plate serving as the ground to form the conductive path only by incorporating the frame into the housing, wire connection is not required.

(Embodiment) Therefore, the details of the present invention will be described below based on the illustrated embodiment.

FIG. 1 shows a position embodiment of the present invention. In the figure, reference numeral 1 is a frame made of a metal material for assembling a printing mechanism such as a platen D and a carriage E. The conductive legs 4, 4, 4 having a length L enough to abut a ground plate 3 described later when set on the body 2.
(FIG. 2) is integrally formed.

Reference numeral 3 denotes the above-mentioned base plate, which also serves as a shield plate of the circuit board F on which integrated circuit elements such as a microcomputer and a memory element are mounted, and is arranged between the circuit board F and the bottom of the housing 2 to form a frame. The position where the tip of the leg portion 1 is located is supported in a state of floating from the bottom surface 2a of the housing, that is, in a cantilever shape so as to be elastically deformable. Reference numeral 5 in the drawing denotes a through hole formed in the circuit board F so that the tip of the leg portion 4 can pass to the main plate 3.

In this embodiment, the main plate 3 is arranged and fixed on the bottom of the housing,
The circuit board F is laminated on this. In this state, when the frame 1 to which the necessary mechanism is assembled is placed at a predetermined position, the tips of the plurality of leg portions 4, 4, 4, ... Contact with the base plate 3 elastically deformed downward. . As a result, a conductive relationship is formed between the frame 1 and the main plate 3, and in this state, if the frame 1 is fixed to the housing 2 with the screw G or the like,
The frame 1 will be grounded without requiring any special wiring work.

In the device configured as described above, static electricity generated in the printing mechanism is released to the main plate 3 with the shortest distance from the nearest legs 4, 4, 4, ... It is possible to reliably prevent malfunction of the circuit section.

FIG. 3 shows a second embodiment of the frame, in which the tips 8a of the legs 8 integrally formed on the lower portion of the frame body 7 are formed in a mountain shape. Can be made even better.

Although the printer has been described as an example in this embodiment, it can be applied to a device such as a facsimile, an electronic copying machine, an optical desk device, etc., in which a mechanical section and an electronic circuit section are built in one housing. It is clear that the same effect is achieved.

Further, in this embodiment, the base plate is deformed downward, but as shown in FIG. 3, the vicinity of the contact portion of the base plate 9 with the leg portion 8 is deformed upward so that the base plate 9 is deformed. It is clear that the same effect can be obtained even if the elastic deformation is made downward by the contact.

(Effect) As described above, in the present invention, a conductive ground plane that is built into the bottom of the housing so that at least one end is cantilevered, and a conductive material that is built into the housing Since it is provided with a frame member for assembling a mechanical system, which is provided with a leg portion of a length that sometimes abuts the cantilever portion of the conductive ground plate and elastically deforms the cantilever portion, each member has a mounting hole. The frame and the ground plane can be conductively connected by simply setting the frame in the housing without the need for processing or mounting of the conductive member.

[Brief description of drawings]

FIG. 1 is a sectional view of an apparatus showing an embodiment of the present invention, FIG. 2 is a bottom view showing an embodiment of a frame of the present invention, and FIG. 3 is a front view of a frame showing another embodiment of the present invention. Figure, and the fourth
The figure is a sectional view showing an example of a conventional ground connection. 1 ... frame, 2 ... housing 3 ... ground plate, 4,4,4 ... legs F ... circuit board

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor, Kushira, Amano 1-4-4, Fujimi-cho, Gyoda-shi, Saitama Prefecture Within GEKO Co., Ltd. (56) References JP-A-60-35423 (JP, A) -46705 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A conductive ground plane incorporated in the bottom of a casing so that at least one end is cantilevered, and a conductive ground plane made of a conductive material, the conductive ground plane of the conductive ground plane when assembled in the casing. A casing structure for an electronic device, comprising: a frame member for assembling a mechanical system, the leg member having a length that abuts on the cantilever portion to elastically deform the cantilever portion.