JP2019106293A - Electronic device - Google Patents

Abstract

To provide an electronic device capable of preventing a conduction failure between a unit side contact and a contact terminal member.SOLUTION: The electronic device includes a contact terminal member 64 electrically connected to a unit-side contact 70 of a unit 52 when the unit is attached to a housing unit. The contact terminal member has a compression coil spring unit and a contact unit. The contact unit has a tubular shape in which a wire is wound helicoidally in a plurality of turns so that a central axis line is in a direction perpendicular to a central axis line of the compression coil spring unit.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an electronic device, and more particularly to an electronic device having an apparatus main body provided with a unit housing portion and a unit detachably mounted to the unit housing portion.

  Patent Document 1 discloses an example of a conventional electronic device of this type. The electronic device of Patent Document 1 includes a detachable unit having an input electrode, a frame to which the detachable unit is detachably mounted, a power supply substrate attached to the frame, an electrical component including an output electrode, and an output electrode of the electrical component And a connection electrode for connecting to the input electrode of the detachable unit. The connection electrode has a vertical portion extending perpendicularly to the connection surface of the output electrode and a parallel portion extending parallel to the connection surface. And as what is comprised as an example of a connection electrode, what is comprised by a compression coiled spring is disclosed, By this connection electrode, the contact part contact | abutted to an input electrode is formed by raising one end of a compression coiled spring. As described above, by using the compression coil spring as the connection electrode, it is possible to obtain an effect of reducing the arrangement space as compared with using the kick spring.

JP, 2015-145917, A

  In the technique of Patent Document 1, there is a concern of conduction failure since the input electrode (unit-side contact) of the detachable unit contacts the contact portion of the connection electrode (contact terminal member) at one point.

  Therefore, the main object of the present invention is to provide a novel electronic device.

  Another object of the present invention is to provide an electronic device capable of preventing a conduction failure between a unit side contact and a contact terminal member.

  A first invention is an electronic device including an apparatus main body including a unit housing and a unit detachably mounted to the unit housing, the unit being provided when the unit is mounted to the unit housing A contact terminal member electrically connected to the unit side contact, and a terminal holding portion provided on the apparatus body and holding the contact terminal member are provided. The contact terminal member includes a compression coil spring portion and a contact portion formed on one end side of the compression coil spring portion. The contact portion has a cylindrical shape in which the wire is wound in a plurality of spirals such that the direction perpendicular to the central axis of the compression coil spring portion is the central axis.

  According to the first aspect of the invention, since the contact portion of the contact terminal member is wound in a plurality, the contact between the unit side contact and the contact portion of the contact terminal member is multipoint contact. Therefore, the unit side contact and the contact terminal member can be brought into contact with each other reliably and stably, and the conduction failure can be prevented.

  A second invention is according to the first invention, and the mounting and demounting direction of the unit is a direction orthogonal to each of the central axis of the compression coil spring portion and the central axis of the contact portion.

  A third invention is according to the first or second invention, and the terminal holding portion includes a contact guide portion guiding movement of the contact portion with respect to the expansion and contraction direction of the compression coil spring portion.

  According to the third aspect of the invention, since the falling and twisting of the contact portion are prevented, oblique contact of the contact portion with the unit side contact (abutment in a state of being inclined from the normal standing state) is prevented. And the contact portion can be stably brought into contact with each other.

  A fourth invention is according to any one of the first to third inventions, and the terminal holding portion is provided with an expandable guide portion for guiding expansion and contraction (axial deformation) of the compression coil spring portion.

  According to the fourth aspect of the invention, the compression coil spring portion is prevented from falling, and the compression coil spring portion can be expanded and contracted smoothly.

  A fifth invention is according to any one of the first to fourth inventions, and the terminal holding portion holds the one end face of the compression coil spring portion, thereby unit-side contacts of the contact portion from the terminal holding portion. It has a protrusion amount regulation part which defines a protrusion amount to the side.

  According to the fifth aspect of the present invention, since the amount of projection of the contact portion can be kept constant, the contact portion and the unit side contact can be properly brought into contact with each other. Further, the amount of compression of the compression coil spring portion can be easily kept constant, and the contact pressure of the contact portion with the unit side contact can be stabilized.

  A sixth invention is according to any one of the first to fifth inventions, and the outer diameter of the contact portion is larger than the outer diameter of the compression coil spring portion.

  According to the sixth aspect of the present invention, the contact angle between the contact portion and the unit side contact is reduced, and the contact portion and the unit side contact can be made to abut each other smoothly. Therefore, the user's sense of operation when mounting the unit in the unit housing portion is improved.

  A seventh invention is according to any one of the first to sixth inventions, and the amount by which the contact portion protrudes from the terminal holding portion is equal to or less than half the outer diameter of the contact portion.

  According to the seventh invention, when the unit is mounted in the unit housing portion, the unit can be prevented from being caught by the contact portion, and the contact portion is appropriately moved in the direction in which the compression coil spring portion is compressed. It can be done.

  An eighth invention is according to any one of the first to seventh inventions, and the contact terminal member is formed on the other end side of the compression coil spring portion, and is an extension portion extending outward from the compression coil spring portion. And an annular portion formed on the tip side of the extension portion. And a terminal attaching part attaches the 1st attaching part to which the 1st fixing member to which an annular part is fixed to the terminal attaching part concerned is attached, and the 2nd fixing member to fix an extending part to the terminal attaching part concerned And a second mounting portion.

  According to the eighth invention, the resistance to vibration of the fixing member is improved, and the fixing member can be prevented from loosening and coming off.

  A ninth invention is according to the eighth invention, and the annular portion includes an overlapping portion in which the proximal end portion and the distal end portion of the wire forming the annular portion are in close contact with each other.

  According to the ninth aspect, when the contact terminal members are collectively stored as parts, it is possible to prevent the contact terminal members from being entangled like a wisdom ring.

  A tenth invention is according to the eighth or ninth invention, and the terminal holding portion includes a retaining portion holding at least one of the heads of the first fixing member and the second fixing member.

  According to the tenth aspect of the invention, loosening and removal of the fixing member can be more reliably prevented.

  An eleventh invention is according to any one of the first to tenth inventions, and the terminal holding portion includes a spring position restricting portion fitted to the other end of the compression coil spring portion.

  According to the eleventh aspect, positional deviation of the contact terminal member in the radial direction of the compression coil spring portion is prevented.

  According to the present invention, since the contact portion of the contact terminal member is wound in a plurality, the contact between the unit side contact and the contact portion of the contact terminal member is a multipoint contact. Therefore, the unit side contact and the contact terminal member can be brought into contact with each other reliably and stably, and the conduction failure can be prevented.

  The above-described objects, other objects, features and advantages of the present invention will become more apparent from the detailed description of the following embodiments given with reference to the drawings.

FIG. 1 is an illustrative view schematically showing an internal structure of an image forming apparatus according to a first embodiment of the present invention. It is an illustration figure which shows the external appearance when the right side door of the image forming apparatus of FIG. 1 is opened. FIG. 6 is an illustrative view showing a rear side frame of a unit housing portion provided in the apparatus main body of the image forming apparatus of FIG. 1 and a transfer unit; FIG. 4 is an illustrative view showing a transfer unit of FIG. 3; FIG. 4 is an illustrative view showing a rear side frame of FIG. 3 divided into a first frame and a second frame; (A) is a front view which shows the contact terminal member provided in the rear side flame | frame of FIG. 3, (B) is a top view which shows a contact terminal member. It is an illustration figure which shows a mode that the contact terminal member peripheral part of the rear side flame | frame of FIG. 3 was seen from the inner side of the unit accommodating part. FIG. 8 is a cross-sectional view showing a cross section of the rear side frame taken along line VIII-VIII in FIG. 7; FIG. 8 is a cross-sectional view showing a cross section of the rear side frame taken along line IX-IX in FIG. 7; It is an illustration figure for demonstrating the fixing method of the contact terminal member with respect to the 1st flame | frame of FIG. It is an illustration figure which shows a mode that the contact terminal member was fixed to the 1st flame | frame of FIG.

[First embodiment]
Referring to FIG. 1, an image forming apparatus 10, which is an example of an electronic apparatus according to the present invention, is a color multifunction machine having a copying function, a printer function, a scanner function, a facsimile function, etc. Forming a multi-color or single-color image on a recording medium).

  However, the image forming apparatus 10 may be either a copier, a facsimile machine, a printer, or the like, or a multifunction machine combining at least two of them, or may be a monochrome machine.

  First, the configuration of the image forming apparatus 10 will be schematically described. As shown in FIGS. 1 and 2, the image forming apparatus 10 includes an apparatus main body 12 including an image forming unit 30 and an image reading apparatus 14 disposed above the apparatus main body 12.

  The image reading device 14 includes a document placement table 16 formed of a transparent material. A document holding cover 18 is attached to the upper side of the document placement table 16 via a hinge or the like so as to be openable and closable. A document supply tray 20 is provided on the upper surface of the document pressing cover 18, and an ADF (automatic document feeder) is provided inside thereof. The ADF automatically supplies the originals placed on the original supply tray 20 one by one to the image reading position 22 and discharges the originals to the original discharge tray 24.

  The image reading unit 26 incorporated in the image reading device 14 includes a light source, a plurality of mirrors, an imaging lens, a line sensor, and the like. The image reading unit 26 exposes the surface of the document with a light source, and guides reflected light reflected from the surface of the document to an imaging lens by a plurality of mirrors. Then, the reflected light is imaged on the light receiving element of the line sensor by the imaging lens. The line sensor detects the luminance and the chromaticity of the reflected light formed on the light receiving element, and generates image data based on the image of the document surface. As a line sensor, a CCD (Charge Coupled Device), a CIS (Contact Image Sensor) or the like is used.

  On the front side of the image reading device 14, an operation panel 28 that receives an input operation such as a print instruction from the user is provided. The operation panel 28 has a display with a touch panel, a plurality of operation buttons, and the like.

  Further, the apparatus body 12 is provided with a control unit (not shown) including a CPU, a memory and the like, and an image forming unit 30. The control unit transmits control signals to each part of the image forming apparatus 10 in response to an input operation to the operation panel 28 or the like, and causes the image forming apparatus 10 to execute various operations.

  The image forming unit 30 includes an exposure unit 32, a developing device 34, a photosensitive drum 36, a cleaner unit 38, a charger 40, a transfer device 42, a fixing unit 44, and the like. The image is formed, and the sheet on which the image is formed is discharged to the discharge tray 48. As image data for forming an image on a sheet, image data read by the image reading unit 26 or image data transmitted from an external computer is used.

  The image data handled in the image forming apparatus 10 correspond to four color images of black (K), cyan (C), magenta (M) and yellow (Y). For this reason, each of the developing device 34, the photosensitive drum 36, the cleaner unit 38 and the charging device 40 is provided four by four so as to form four types of latent images corresponding to the respective colors, and thereby four image stations are provided. Configured

  The photosensitive drum 36 is an image carrier having a photosensitive layer formed on the surface of a conductive cylindrical substrate, and the charging device 40 is a member for charging the surface of the photosensitive drum 36 to a predetermined potential. is there. Further, the exposure unit 32 is configured as a laser scanning unit (LSU) including a laser emitting unit, a reflection mirror, etc., and exposes the surface of the charged photosensitive drum 36 to electrostatic latent light according to the image data. An image is formed on the surface of the photosensitive drum 36. The developing unit 34 visualizes the electrostatic latent image formed on the surface of the photosensitive drum 36 with toner of four colors (YMCK). The cleaner unit 38 also removes toner remaining on the surface of the photosensitive drum 36 after development and image transfer.

  The transfer device 42 is a device for transferring a toner image formed on the photosensitive drum 36 onto a sheet, and includes an intermediate transfer unit 50 and a transfer unit (secondary transfer unit) 52. However, the transfer device 42 does not necessarily have to be an intermediate transfer method including the intermediate transfer unit 50, and a configuration in which the toner image on the photosensitive drum 36 is directly transferred to the sheet by the transfer unit may be employed.

  The intermediate transfer unit 50 includes an intermediate transfer belt, a suspension roller, and four intermediate transfer rollers, and is disposed above the photosensitive drum 36. At the time of image formation, by applying a predetermined voltage to the intermediate transfer roller, a transfer electric field is formed between the photosensitive drum 36 and the intermediate transfer belt. Then, the toner image formed on the outer peripheral surface of the photosensitive drum 36 is sequentially transferred to the outer peripheral surface of the intermediate transfer belt, which rotates, by the action of the transfer electric field.

  The transfer unit 52 includes a transfer roller 54 provided to press the intermediate transfer belt. At the time of image formation, by applying a predetermined voltage to the transfer roller 54, a transfer electric field is formed between the intermediate transfer belt and the transfer roller 54. Then, while the sheet passes through the transfer nip portion between the intermediate transfer belt and the transfer roller 54, the toner image formed on the outer peripheral surface of the intermediate transfer belt is transferred to the sheet by the action of the transfer electric field. The transfer unit 52 is detachably mounted to the unit housing portion 60 of the apparatus main body 12 as will be described in detail later, and a contact terminal provided on the device main body 12 side when mounted to the unit housing portion 60. It is electrically connected to the member 64.

  The fixing unit 44 includes a heat roller and a pressure roller, and is disposed above the transfer unit 52. The heat roller is set to have a predetermined fixing temperature, and when the sheet passes through the fixing nip portion between the heat roller and the pressure roller, the toner image transferred to the sheet is melted, mixed, and the like. The toner image is thermally fixed to the sheet by pressure contact.

  In such an apparatus main body 12, a first sheet conveyance path L1 for feeding a sheet conveyed from a sheet feeding cassette 46 or the like to the sheet discharge tray 48 via the registration roller 56, the transfer device 42 and the fixing unit 44. Is formed. Also, when performing duplex printing on a sheet, the sheet after single-sided printing is completed and passed through the fixing unit 44 is returned to the first sheet conveyance path L1 upstream of the transfer roller 54 in the sheet conveyance direction. The second sheet conveyance path L2 is formed. In the first sheet conveyance path L1 and the second sheet conveyance path L2, a plurality of conveyance rollers 58 for applying a propelling force to the sheets in an auxiliary manner are appropriately provided.

  Subsequently, a contact structure for electrically connecting the transfer unit 52 and the contact terminal member 64 provided on the side of the apparatus main body 12 will be described.

  As shown in FIGS. 2 and 3, the apparatus main body 12 includes a unit accommodating portion 60 for accommodating the transfer unit 52. Two contact terminal members 64 are provided on the rear side frame 62 that constitutes one side wall (side wall on the rear side of the apparatus main body 12) of the unit housing portion 60. However, the number and position of the contact terminal members 64 provided on the device body 12 side can be appropriately changed according to the structure of the corresponding unit.

  Further, on the right side wall of the apparatus main body 12, a right side door 66 used for removing a sheet stopped in the middle of the sheet conveyance paths L1 and L2 or replacing the transfer unit 52 is provided openably and closably. The transfer unit 52 is attached to the inner surface side of the right side door 66, and is removed from the unit storage unit 60 as the right side door 66 is opened and closed. The mounting and demounting direction of the transfer unit 52 is a direction orthogonal to the central axis of the compression coil spring portion 80 of the contact terminal member 64 described later and the central axis of the contact portion 82, respectively.

  As shown in FIGS. 3 and 4, the transfer unit 52 includes a transfer roller 54 and a unit frame 68 that rotatably holds the transfer roller 54. On one end face in the longitudinal direction of the unit frame 68 (end face on the rear side of the apparatus body 12), two power supply or electric signals are received from the apparatus body 12 at positions corresponding to the two contact terminal members 64. A unit side contact (electrode) 70 is provided. Then, the transfer unit 52 is attached to the unit housing portion 60, so that the two contact terminal members 64 on the apparatus body 12 side and the two unit side contacts 70 on the transfer unit 52 side abut each other to electrically connect. Be done.

  Hereinafter, the configurations of the rear side frame 62 and the contact terminal member 64 will be specifically described. As shown in FIG. 5, the rear side frame 62 is formed of an electrically insulating synthetic resin or the like, and is disposed on the first frame 72 disposed on the inner surface side of the unit housing 60 and on the rear surface side of the first frame 72. And a second frame 74 provided detachably. Further, the rear side frame 62 has two terminal holding portions 76, and the contact terminal members 64 are attached to and held by each of the terminal holding portions 76. In addition, since each contact terminal member 64 comrades and each terminal holding | maintenance part 76 have the same structure, below, one representative thing is demonstrated.

  As shown in FIG. 6, the contact terminal member 64 includes a compression coil spring portion 80, a contact portion 82 continuously formed from one end side of the compression coil spring portion 80, and the other end side of the compression coil spring portion 80. It includes extending portions 84 formed continuously, which are formed by deforming a single wire having conductivity. In this embodiment, the contact terminal member 64 is formed using a nickel chromium wire having a low surface resistance.

  The compression coil spring portion 80 has a cylindrical shape in which a wire is spirally wound a plurality of times so as to be extensible and contractible in the axial direction. The compression coil spring portion 80 generates a pressing force on the unit side contact 70 at the contact portion 82 by being compressed in the axial direction.

  The contact portion 82 is a portion in contact with the unit-side contact 70, and a short cylindrical shape in which the wire is spirally wound a plurality of times such that the direction orthogonal to the central axis of the compression coil spring 80 is the central axis. Have. Contact portion 82 is arranged such that a portion thereof protrudes from terminal holding portion 76 into unit housing portion 60 (that is, on the unit side contact 70 side) (see FIGS. 8 and 9) and abuts on unit side contact 70 As a result, the compression coil spring 80 moves in the direction in which it is compressed. Here, the number of turns of the contact portion 82 is not particularly limited as long as it is two or more, but in consideration of the axial length of the contact portion 82, it is preferable to be about 3 to 5 turns. In this embodiment, the number of turns of the contact portion 82 is four. As described above, by forming the contact portion 82 in a plurality of turns, the contact of the contact portion 82 with respect to the unit side contact 70 can be made multipoint contact.

  Moreover, it is preferable that the winding method of the contact point part 82 is close_contact | adherence winding with which adjacent cyclic | annular wire stick_contact | adheres. By making the contact portion 82 in close contact winding, the axial length of the contact portion 82 can be suppressed, and moreover, the contact portion 82 is hardly deformed and the shape of the contact portion 82 is stabilized. Furthermore, it is preferable that the winding direction of the contact portion 82 is reversely wound to the winding direction of the compression coil spring portion 80. By reversely winding the contact portion 82 with respect to the compression coil spring portion 80, automatic winding of the contact terminal member 64 by a machine becomes possible.

  Further, the outer diameter of the contact portion 82 is preferably larger than the outer diameter of the compression coil spring portion 80. By increasing the outer diameter of the contact portion 82, the inclination angle of the outer peripheral surface of the contact portion 82 becomes gentle at the portion projecting from the terminal holding portion 76. Therefore, when the transfer unit 52 is attached to the unit housing portion 60, the contact angle of one end edge of the unit frame 68 with the outer peripheral surface of the contact portion 82 becomes small, and the contact portion 82 and the unit side contact 70 are smoothed. It can be made to abut. Also, the contact portion 82 moves slowly in the direction in which the compression coil spring portion 80 is compressed. Therefore, the user's operation feeling when mounting the transfer unit 52 in the unit accommodating portion 60 is improved.

  Furthermore, the protrusion amount (projecting height) of the contact portion 82 from the terminal holding portion 76 is equal to or less than half the outer diameter of the contact portion 82 when the transfer unit 52 is not attached to the unit housing portion 60. Is preferred. This prevents the transfer unit 52 from being caught by the contact portion 82 when the transfer unit 52 is attached to the unit housing portion 60, and also allows the contact portion 82 to be compressed in the direction in which the compression coil spring 80 is compressed. It can be moved properly. The protrusion amount of the contact portion 82 is defined by a protrusion amount regulating portion 94 described later.

  The extension portion 84 is formed to extend linearly outward from the other end of the compression coil spring portion 80. Further, an annular portion 86 connected to a lead 110 (see FIG. 10) or the like from a high voltage power supply substrate (not shown) is formed at the tip of the extending portion 84. The annular portion 86 has an overlapping portion 86 a in which the proximal end portion and the distal end portion closely overlap with each other. If the annular portion 86 does not have the overlapping portion 86a, there is a risk that the annular portions 86 of the contact terminal members 64 may be entwined like a wisdom ring when the contact terminal members 64 are stored together as a part. Such a defect can be eliminated by forming the portion 86a.

  Such a contact terminal member 64 is held by the terminal holding portion 76 of the rear side frame 62 as described above. Referring to FIGS. 7 to 11 together with FIG. 5, the terminal holding portion 76 is formed of the contact guide portion 90 formed on the first frame 72, the telescopic guide portion 92, the projection amount restriction portion 94, the first attachment portion 96 and the first A mounting portion 98, a retaining portion 100 formed on the second frame 74, a spring support portion 102, a spring position regulating portion 104, and the like are provided.

  The contact guide portion 90 is provided to surround the contact portion 82 of the contact terminal member 64, and has a plurality of ribs (protrusions) extending in the expansion and contraction direction (axial direction) of the compression coil spring portion 80 on the inner surface side. The contact guide portion 90 guides the movement of the contact portion 82 in the expansion and contraction direction of the compression coil spring portion 80, and restricts the movement of the contact portion 82 in directions other than the expansion and contraction direction of the compression coil spring portion 80. That is, the contact guide portion 90 supports the periphery of the contact portion 82 so that the contact portion 82 can move in the expansion and contraction direction of the compression coil spring portion 80, thereby preventing the contact portion 82 from falling and twisting. A part of the contact portion 82 protrudes into the unit housing portion 60 from an opening 90 a formed on the front end side of the contact guide portion 90.

  The telescopic guide portion 92 guides the expansion and contraction (the deformation in the axial direction) of the compression coil spring portion 80, and is provided to guide and hold the outer peripheral surface of the compression coil spring portion 80. That is, the expansion and contraction guide 92 prevents the compression coil spring 80 from falling by guiding and holding the outer peripheral surface of the compression coil spring 80 so that the compression coil spring 80 can expand and contract. In this embodiment, the telescopic guide portion 92 is constituted by two opposing circular arc plates. However, the telescopic guide portion 92 may be configured by a plurality of ribs extending in the telescopic direction of the compression coil spring portion 80.

  The protrusion amount regulation portion 94 regulates the protrusion amount of the contact portion 82 by pressing (locking) one end surface of the compression coil spring portion. In this embodiment, the rear end surface (the end surface on the opposite side to the opening 90 a) of the contact guide portion 90 is used as the protrusion amount control portion 94. By providing such a projection amount restriction portion 94, the projection amount of the contact portion 82 can be kept constant, so that the contact portion 82 and the unit side contact 70 can be properly brought into contact with each other. Further, the amount of compression of the compression coil spring portion 80 can be easily kept constant, and the contact pressure of the contact portion 82 with the unit side contact 70 can be stabilized.

  The first attachment portion 96 is a screw hole to which the first screw (first fixing member) 106 is attached. As can be clearly seen from FIGS. 10 and 11, the first screw 106 holds the annular portion 86 of the contact terminal member 64 and the end of the lead wire 110 between its head and the first attachment portion 96. The contact terminal member 64 and the lead wire 110 are electrically connected and fixed to the terminal holding portion 76. On the other hand, the second attachment portion 98 is a screw hole to which the second screw (second fixing member) 108 is attached. The second screw 108 fixes the contact terminal member 64 to the terminal holding portion 76 by sandwiching the central portion of the extension portion 84 of the contact terminal member 64 between its head and the second attachment portion 98. As described above, the vibration is achieved by fixing not only the annular portion 86 to the terminal holding portion 76 (that is, not only fixing the conductive portion) but also fixing the central portion of the extending portion 84 to the terminal holding portion 76. Thus, the first screw 106 or the second screw 108 can be prevented from loosening and coming off.

  The securing portion 100 is a portion for pressing the head of the first screw 106 and the second screw 108 from the back side. Thus, by holding the head of the first screw 106 and the second screw 108 by the retaining portion 100, the resistance to vibration is further improved, and the loosening and removal of the first screw 106 or the second screw 108 Can be prevented more reliably. However, the retaining portion 100 can also be configured to hold the head of either one of the first screw 106 and the second screw 108.

  The spring support portion 102 is formed in a cylindrical shape having a diameter substantially the same as the diameter of the compression coil spring portion 80, and supports the other end surface of the compression coil spring portion 80. The spring position restricting portion 104 is, for example, a cruciform protrusion, and is formed to project forward (on the side of the compression coil spring portion 80) with respect to the front end face of the spring support portion 102. The spring position restricting portion 104 is fitted into the other end of the compression coil spring portion 80, thereby defining the position of the compression coil spring portion 80, and the positional deviation of the contact terminal member 64 in the radial direction of the compression coil spring portion 80. To prevent.

  In such an image forming apparatus 10, when the transfer unit 52 is attached to the unit housing portion 60, the unit side contacts 70 of the transfer unit 52 abut against the outer peripheral surface of the contact portion 82 of the contact terminal member 64 from the side. The contact portion 82 moves in the direction in which the compression coil spring portion 80 is compressed. At this time, since the terminal holding portion 76 includes the contact guide portion 90, the contact portion 82 is prevented from falling and twisting, and the contact of the contact portion 82 with respect to the unit side contact 70 is oblique ( Contact is prevented. Therefore, unit side contact 70 and contact part 82 can be stably contacted. Moreover, since the unit side contact 70 and the contact part 82 of the contact terminal member 64 contact at multiple points, the unit side contact 70 and the contact part 82 can be reliably and stably brought into contact.

  As described above, according to the first embodiment, since the contact portion 82 of the contact terminal member 64 is wound in a plurality, the contact between the unit side contact 70 and the contact portion 82 of the contact terminal member 64 is multipoint It will be a touch. Therefore, the unit side contact 70 and the contact portion 82 of the contact terminal member 64 can be brought into contact with each other reliably and stably, and the conduction failure can be prevented.

  Further, since the contact guide portion 90 is provided, the falling and twisting of the contact portion 82 of the contact terminal member 64 can be prevented. Therefore, the unit side contact 70 and the contact portion 82 of the contact terminal member 64 can be brought into contact more stably.

  Furthermore, since the projection amount restriction portion 94 is provided, the contact pressure of the contact portion 82 with the unit side contact 70 can be stabilized.

Second Embodiment
Next, an image forming apparatus according to a second embodiment of the present invention will be described. In the above-described first embodiment, the mounting and demounting direction of the unit (transfer unit) is a direction orthogonal to each of the central axis of the compression coil spring portion and the central axis of the contact portion. The mounting and demounting direction is the same as the axial direction (stretching direction) of the compression coil spring portion of the contact terminal member. Although not shown, in the image forming apparatus according to the second embodiment, the opening and closing door is provided on the front side of the apparatus main body, and the unit is attached and detached from the front side of the apparatus main body. The unit side contact is provided on the end face on the tip side in the mounting direction of the unit, and abuts on the contact portion of the contact terminal member provided on the side wall on the rear side of the apparatus body when the unit is mounted in the unit housing.

  Also in the second embodiment, the same function and effect as those of the first embodiment can be obtained, and the unit side contact and the contact terminal member can be reliably and stably brought into contact with each other, and the conduction failure can be prevented.

Third Embodiment
Next, an image forming apparatus according to a third embodiment of the present invention will be described. In the first embodiment described above, the contact terminal member has the extending portion and the annular portion. However, in the third embodiment, the extending portion and the annular portion are not formed in the contact terminal member. That is, the contact terminal member is constituted only by the compression coil spring portion and the contact portion. A lead wire or the like from the high voltage power supply substrate is directly connected to the other end surface of the compression coil spring portion.

  Also in the third embodiment, the same function and effect as those of the first embodiment can be obtained, and the unit side contact and the contact terminal member can be reliably and stably brought into contact with each other, and the conduction failure can be prevented.

  In the first embodiment described above, the transfer unit has been exemplified as an example of the unit detachably mounted in the unit housing portion of the apparatus main body, but the present invention is not limited to this. Further, although the image forming apparatus is illustrated as an example of the electronic device in the above-described embodiment, the present invention is not limited to this. The present invention relates to various electronic devices, such as personal computers, which need to electrically connect the unit side contacts provided in the unit and the contact terminal members provided in the apparatus main body when the unit is mounted in the unit housing portion. The present invention can be applied to a television receiver and the like.

  Further, the above-described specific numerical values, part shapes and the like are merely examples, and can be appropriately changed according to the needs of the product specifications and the like.

10 ... image forming apparatus 12 ... apparatus main body 14 ... image reading apparatus 30 ... image forming unit 52 ... transfer unit (unit)
60 ... unit housing portion 62 ... rear side frame 64 ... contact terminal member 70 ... unit side contact 76 ... terminal holding portion 80 ... compression coil spring portion 82 ... contact portion 84 ... extension portion 86 ... annular portion 86 a ... overlapping portion 90 ... contact point Guide portion 92: Expansion and contraction guide portion 94: Projection amount defining portion 96: First mounting portion 98: Second mounting portion 100: Retaining portion 104: Spring position regulating portion 106: First screw (first fixing member)
108 ... second screw (second fixing member)
110 ... Lead wire

Claims (11)

An electronic apparatus comprising: an apparatus main body including a unit accommodating portion; and a unit detachably mounted to the unit accommodating portion,
A contact terminal member electrically connected to a unit-side contact included in the unit when the unit is mounted in the unit housing portion, and a terminal holding portion provided on the device body and holding the contact terminal member Equipped
The contact terminal member is
Compression coil spring,
A contact portion formed on one end side of the compression coil spring portion and having a cylindrical shape in which a wire is wound in a plurality of spirals such that a direction perpendicular to the central axis of the compression coil spring portion is the central axis; , An electronic device.   The electronic device according to claim 1, wherein the mounting and demounting direction of the unit is a direction orthogonal to each of a central axis of the compression coil spring portion and a central axis of the contact portion.   The electronic device according to claim 1, wherein the terminal holding portion includes a contact guide portion that guides the movement of the contact portion in the expansion and contraction direction of the compression coil spring portion.   The said terminal holding part is an electronic device in any one of Claim 1 to 3 provided with the expansion-contraction guide part which guides the expansion-contraction of the said compression coil spring part.   The terminal holding portion is provided with a projection amount regulating portion which regulates an amount of projection of the contact portion from the terminal holding portion toward the unit side contact by pressing one end surface of the compression coil spring portion. The electronic device according to any one of 1 to 4.   The electronic device according to any one of claims 1 to 5, wherein an outer diameter of the contact portion is larger than an outer diameter of the compression coil spring portion.   The electronic device according to any one of claims 1 to 6, wherein an amount of projection of the contact portion from the terminal holding portion is equal to or less than half of an outer diameter of the contact portion. The contact terminal member is formed on the other end side of the compression coil spring portion, and includes an extension portion extending outward from the compression coil spring portion, and an annular portion formed on the tip end side of the extension portion.
The terminal holding portion includes a first attachment portion to which a first fixing member for fixing the annular portion to the terminal holding portion is attached, and a second fixing member for fixing the extension portion to the terminal holding portion. The electronic device according to any one of claims 1 to 7, further comprising: a second attachment portion to be attached.   The electronic device according to claim 8, wherein the annular portion includes an overlapping portion in which a proximal end portion and a distal end portion of a wire forming the annular portion are in close contact and overlap each other.   The electronic device according to claim 8, wherein the terminal holding portion includes a retaining portion that holds a head of at least one of the first fixing member and the second fixing member.   The electronic device according to any one of claims 1 to 10, wherein the terminal holding portion includes a spring position restricting portion fitted to the other end portion of the compression coil spring portion.

Images