JP2006099954A - Mechanical chassis - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce costs by decreasing the number of components and to improve the positioning accuracy of a guide shaft with respect to a mechanical chassis regarding the guide shaft inserted into the guide hole of a recording medium to position the recording medium. <P>SOLUTION: A guide shaft 218 provided in a shaft-tilted conical part 218c is tilted toward an insertion end side into which a recording medium is inserted to be integrally formed in a sheet metal mechanical chassis. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mechanical chassis. Specifically, a mechanical chassis in which a guide shaft that is inserted into a guide hole of a recording medium and positions the recording medium is integrally formed, and the cost is reduced by reducing the number of parts, and the guide shaft with respect to the mechanical chassis. The present invention relates to a technique for improving positional accuracy.

  For example, there is an MD recording / reproducing apparatus that performs recording / reproduction on a recording / reproducing medium on which recording or reproduction, or both of them are performed, for example, MD (mini disk). In general, an MD is formed by arranging a disk in a cassette case. In the above-described MD recording / reproducing apparatus, in order to properly mount the MD disk on a mounting portion (turn table) provided in the mechanical chassis, the cassette case is used. Must be positioned at a predetermined position of the mechanical chassis.

  The mounting of the MD disk to the mounting portion is performed when the holder holding the MD that is detachably supported by the mechanical chassis is moved to the mechanical chassis side and the holder just contacts the mechanical chassis. . Then, the positioning of the MD cassette case with respect to the mechanical chassis is such that when the holder moves to the mechanical chassis side, a plurality of guide shafts protruding from the mechanical chassis are provided in the positioning holes formed on the bottom surface of the cassette case. It is performed by being inserted relatively.

  In order to provide the guide shaft to the mechanical chassis when the mechanical chassis is formed of a sheet metal material, for example, conventionally, the guide shaft formed separately by cutting is attached to the mechanical chassis by screwing. Yes.

  However, when the mechanical chassis is formed of a sheet metal material, the conventional method of attaching a separate guide shaft requires a mounting screw for attaching the separate guide shaft to the mechanical chassis, resulting in an increase in the number of parts. There is a problem such as.

  In addition, since the mounting to the mechanical chassis is performed by screwing, for example, if the mounting screws are loosened due to vibration during use of the device, the guide shaft may be displaced relative to the mechanical chassis. There is also a disadvantage that it is difficult to ensure good positional accuracy of the guide shaft with respect to the mechanical chassis.

  Furthermore, it is necessary to perform an assembling process by screwing for attaching the guide shaft to the mechanical chassis, and there is a problem that the corresponding work time is required.

  Accordingly, the present invention relates to a guide shaft for overcoming the above-described problems and positioning the recording medium by being inserted into the guide hole of the recording medium, and at the same time, the cost of the guide shaft is reduced by reducing the number of parts. It is an object of the present invention to improve the positional accuracy with respect to the chassis and to reliably insert the guide shaft into the guide hole of the recording medium.

  In order to solve the above-described problems, the reproducing apparatus of the present invention is a mechanical chassis on which a recording medium is mounted, and a guide shaft having a conical portion with an inclined shaft is integrally formed.

  Therefore, it is not necessary to form a guide shaft separately from the mechanical chassis and attach it to the mechanical chassis, and there is no need for mounting screws for mounting, so the number of parts can be reduced, thereby reducing the cost. Contributes to reduction.

  In addition, since the guide shaft is formed integrally with the mechanical chassis, it is possible to ensure good positional accuracy of the guide shaft with respect to the mechanical chassis, and it is possible to process the guide shaft when processing the mechanical chassis. Further, it is not necessary to perform assembly work for attaching the guide shaft to the mechanical chassis, and the work time can be greatly shortened. Further, since the guide shaft has a conical portion with an inclined shaft, the guide shaft is surely inserted into the guide hole of the recording medium when positioning is performed, so that the recording medium can be positioned reliably. .

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. In the illustrated best mode, the present invention is applied to a portable MD (mini disc) reproducing apparatus.

  In this specification, the direction indicated by arrow F in FIG. 1 is the front, the direction indicated by arrow B is the rear, the direction indicated by arrow U is the top, the direction indicated by arrow D is the bottom, and the direction indicated by arrow L is the left. In the description, the direction indicated by the arrow R is the right.

  First, the external appearance of the MD playback apparatus 1 will be described.

  The outer casing 2 includes two upper and lower case bodies, that is, an upper case body 3 and a lower case body 4, and an outer casing main portion 5 whose front end is opened by combining the case bodies 3 and 4 vertically. It is formed. A front case body 6 is disposed at the front end of the outer casing main portion 5, thereby forming an outer casing 2 in which a substantially upper third portion of the front surface and a front end portion of the upper surface are opened.

  A cover body 8 that opens and closes the opening 7 that is formed at the front end of the outer casing 2 and serves as an MD insertion / removal opening is rotatably disposed. The cover body 8 is rotated between a closed position where the opening 7 is closed as shown in FIG. 1 and an open position where the opening 7 is opened as shown in FIG. . Further, as will be described later, the turning force toward the closing position is resiliently urged to the cover body 8.

  The upper end surface 9 of the front case body 6, that is, the lower opening edge of the opening 7 is a front-declining slope, and the lower end face 10 of the cover body 8 is a front-rising slope. Thereby, in the state where the cover body 8 is in the closed position, the insertion concave portion 11 that is opened in a substantially V shape toward the front side is formed.

  The MD (mini disk) 12 is mounted as follows.

  After inserting the insertion tip of the MD 12 into the insertion recess 11, the MD 12 is pushed in. Then, the pushing force pushes the inclined surface of the cover body 8, and a turning force is applied to the cover body 8 toward the open position, whereby the opening 7 is opened and the MD 12 is inserted as it is. . Then, when the MD 12 is almost inserted, it is automatically retracted thereafter, the cover body 8 moves to the closed position, and the MD 12 is mounted at a predetermined mounting position.

  A main chassis (casing) 100 is disposed in the outer casing 2, and a mechanical chassis 200 is floatingly supported on the main chassis 100.

  The main chassis 100 is formed by bending a sheet metal material, and includes a top plate portion 110, a right side surface portion 120 suspended from the right edge of the top plate portion 110, and a left side surface portion suspended from the left edge of the top plate portion 110. And 130 are integrally formed (see FIG. 4). Then, substantially upper half portions of the front end portions of the right side surface portion 120 and the left side surface portion 130 and the front end portion of the top plate portion 110 are cut out, and a front surface portion 140 is bridged between the front ends of the right side surface portion 120 and the left side surface portion 130. As a result, an opening 111 that opens upward and forward is formed at the front end of the main chassis 100. Further, the top plate portion 110 has a notch 112 formed at the rear end portion of the right edge thereof, and the right side surface portion 120 is formed up to a position corresponding to the front edge of the notch 112. Furthermore, an attachment piece 113 is suspended from the right end portion of the rear edge of the top plate portion 110.

  Further, a support piece 114 is suspended from the center of the portion near the rear end of the top plate portion 110 slightly to the right, and a support hole 114a is formed in the support piece 114.

  Support shafts 141 and 141 projecting rearward are fixed to positions near the left and right ends of the front portion 140, and damper members 142 and 142 made of an elastic material such as butyl rubber are externally fitted to the support shafts 141 and 141, respectively. It is attached to. The damper member 142 is integrally formed with a main portion 142a serving as a supported portion having an elongated conical outer shape and a flange portion 142b that protrudes from the outer peripheral surface on the bottom side of the main portion 142a and functions as an elastic contact portion. And has a hole 142c opened in the bottom surface, and the support shaft 141 is lightly press-fitted into the hole 142c and attached to the support shaft 141 (see FIG. 5).

  The mechanical chassis 200 is also formed by bending a sheet metal material, and bent edges 211, 211,. Circular support holes 212 and 212 are formed at positions near the left and right edges of the bent edges 211 and 211 located on the front side. A support shaft 213 protrudes rearward at a position slightly to the right from the center of the rear bent edge 211.

  A damper member 214 similar to the damper member 142 is attached to the support shaft 213 in an outer fitting manner. The bumper member 214 is made of an elastic material such as butyl rubber, and has a main portion 214a serving as a supported portion having an elongated conical outer shape, and a flange that protrudes from the outer peripheral surface on the bottom side of the main portion 214a and functions as an elastic contact portion. The portion 214b is integrally formed with a hole 214c opened at the bottom, and the support shaft 213 is lightly press-fitted into the hole 214c and attached to the support shaft 213.

  Thus, the main portions 142a and 142a of the damper members 142 and 142 provided in the main chassis 100 are fitted into the support holes 212 and 212 of the mechanical chassis 200 until the flange portions 142b and 142b abut against the bent edges 211 and 211. Further, the main portion 214a of the damper member 214 provided in the mechanical chassis 200 is fitted into the support hole 114a of the main chassis 100 until the flange portion 214b contacts the support piece 114, whereby the mechanical chassis 200 is The chassis 100 is floatingly supported via three damper members 142, 142, and 214. That is, the vibrations in the direction orthogonal to the respective support shafts 141, 141, 213 are received by the main portions 142a, 142a, 214a of the damper members 142, 142, 214, and the vibrations in the direction in which the support shafts 141, 141, 213 extend. Are received by the flange portions 141b, 141b, and 214b of the damper members 142, 142, and 214, so that vibrations in all directions are hardly transmitted to the mechanical chassis 200.

  A spindle motor 220 is disposed at the center of the main surface portion 210 of the mechanical chassis 200, and a turntable 222, which is an MD12 mounting portion, is attached to the rotation shaft 221 of the spindle motor 220 (FIGS. 6 and 7). reference).

  The optical pickup 230 is movably supported in the left-right direction at the center of the main surface 210 of the mechanical chassis 200 in the left-right direction, that is, in the radial direction of the MD 12 placed on the turntable 222.

  A large rectangular opening 215 is formed on the left side of the main surface 210 of the mechanical chassis 200 where the spindle motor 220 is disposed, from the center to the front of the left edge, and moves into the opening 215. An optical pickup 230 which is a body is arranged so as to be movable in the left-right direction.

  That is, the optical pickup 230 is supported by the moving base 231, and the moving base 231 is supported by the guide shaft 232 and the auxiliary guide rail 233 so as to be movable in the left-right direction.

  The guide shaft 232 is formed to extend along the rear edge of the opening 215, and the guide shaft 232 is slidably inserted into a guided portion 234 formed at the rear end of the moving base 231. Accordingly, the rear end portion of the moving base 231 is slidably supported on the guide shaft 232.

  The auxiliary guide rail 233 is formed integrally with the mechanical chassis 200 at the front edge of the opening 215 (see FIG. 8). That is, the upper end of the crank-shaped portion of the cross-sectional shape is integrally formed so as to be continuous with the front edge of the opening portion 215 formed in the main surface portion 210 that is the base portion of the mechanical chassis 200 that is a workpiece. The auxiliary guide rail 233 is formed by forming the upper and lower end surfaces of the rear end portion of the crank-shaped portion so as to form a convex arc shape in a cross-sectional shape.

  A method of forming the auxiliary guide rail 233 will be described in detail with reference to FIGS.

  First, when the opening 215 is punched out, a portion 233a bent into an L-shape to be a base is formed (see FIG. 9). Next, the tip of the portion 233a is further bent downward to form a bent piece (folded portion) 233b (see FIG. 10). Finally, the upper and lower end surfaces 233c and 233d of the bent piece 233b are processed to simultaneously form convex arcuate surfaces (see FIG. 11). At this time, the upper arc surface 233c is positioned above the upper surface of the portion 233a so that the portion 233e extends downward from the portion near the base of the horizontal portion to the portion in contact with the bent piece 233b. By pressing, a recess is formed on the upper surface side of the portion 233e. In this way, the auxiliary guide rail 233 is formed, and such processing can be simultaneously performed in the process of press-molding the mechanical chassis 200. In addition, in the portion 233a bent in an L shape, reinforcing irregularities 233f, 233f,..., Which are reinforcing ribs, are formed in portions other than the end where the bent piece 233b is formed. Such reinforcing irregularities 233f, 233f,... Are formed at the same time when the portion 233a bent in an L shape is formed.

  Further, as shown in FIGS. 12 to 14, the auxiliary guide rail 240 having a different form from the auxiliary guide rail 233 can be formed integrally with the mechanical chassis 200.

  That is, first, when the opening 215 is punched out, a portion 241 that is bent into an L-shape that becomes a base is formed (see FIG. 12). Next, the tip of the portion 241 is folded from below to form a folded piece (folded portion) 242 (see FIG. 13). Then, the auxiliary guide rail 240 is formed by pressing so that the folded piece 242 and the portion 241 are in close contact with each other (see FIG. 14). Such an auxiliary guide rail 240 can also be formed simultaneously with the process of press-molding the mechanical chassis 200. Therefore, it is possible to reduce the number of parts and the number of assembly steps.

  Guided pieces 235 and 235 that project from the front end of the moving base 231 of the optical pickup 230 so as to be spaced apart in the vertical direction and projecting in parallel toward the front and engaging with the auxiliary guide rail 233 are provided. The guided pieces 235 and 235 are respectively brought into contact with the upper and lower surfaces 233c and 233d of the auxiliary guide rail 233, that is, the sliding surfaces (see FIG. 8). As described above, the optical pickup 230 is supported by the guide shaft 232 and the auxiliary guide rail 233 so as to be movable in the left-right direction within the opening 215.

  The optical pickup 230 is moved in the left-right direction by the pickup feeding mechanism 250 (see FIGS. 6, 7 and 15).

  The pickup feed mechanism 250 includes a motor 251, a feed screw 253 that is rotated by the motor 251 through a gear train 252, and a nut member 254 that is supported by the moving base 231 of the optical pickup 230 and engages with the feed screw 253. .

  The feed screw 253 is rotatably supported by two bearing portions 255 and 256 at a position extending along the rear edge of the opening 215 on the lower surface of the main surface portion 210 of the mechanical chassis 200.

  Both the two bearing portions 255 and 256 are formed integrally with the mechanical chassis 200.

  The bearing portion 255 is integrally formed with the mechanical chassis 200 as follows (see FIGS. 16 to 18).

  First, two parallel slits 255a and 255a are formed in a sheet metal material (material of the mechanical chassis 200) (see FIG. 16). Next, the portion excluding the end of the portion (inter-slit portion) 255b located between the slits 255a and 255a is divided into several portions and formed into a substantially U shape (see FIG. 17). In parallel with this drawing process, a central portion at a position adjacent to one side 255a of the slit is punched out to the side from which the U-shaped portion 255b is projected to form a receiving portion 255c as a protruding portion (see FIG. 18). . In this way, the bearing portion 255 is formed, the left end portion of the U-shaped portion 255b feed screw 253 is inserted, and the portion immediately on the right side of the portion inserted into the U-shaped portion 255b is the above-described portion. It is received by the receiving portion 255c.

  The bearing portion 256 is formed integrally with the mechanical chassis 200 as follows (see FIGS. 19 to 21).

  Also in this case, first, two parallel slits 256a and 256a are formed in the sheet metal material (material of the mechanical chassis 200) (see FIG. 19). Next, a portion (inter-slit portion) 256b positioned between the slits 256a and 256a is divided into several portions and narrowed to form a substantially U-shape having a wide width (see FIG. 20). Then, a portion excluding both end portions is formed into a semicircular shape while being squeezed toward the main surface portion 210 to form a receiving portion 256c, and a bearing portion 256 is formed (see FIG. 21). Then, a portion near the right end of the feed screw 253 is supported by the receiving portion 256c.

  Both the above-described bearing portions 255 and 256 can be simultaneously formed by press working when the mechanical chassis 200 is formed. Therefore, it is possible to reduce the number of parts and the number of assembly steps.

  The nut member 254 is formed of a leaf spring material, and has a resilient contact piece 254a, and an engagement protrusion 254b is formed in the resilient contact piece 254a in a punched shape (see FIG. 15). The nut member 254 is fixed to the lower surface of the rear end portion of the moving base 231 so that the elastic contact piece 254a protrudes rearward, and the engagement protrusion 254b of the elastic contact piece 254a is connected to the screw 253a of the feed screw 253. Engage from below.

  A preload spring 257 made of a leaf spring material is fixed to the mechanical chassis 200 (see FIG. 15). The preload spring 257 is formed with a preload portion 257 a that elastically presses the feed screw 253 in the thrust direction and a press portion 257 b that elastically presses the feed screw 253 toward the main surface 210 of the mechanical chassis 200. Thus, the tip of the preload portion 257a of the preload spring 257 is elastically contacted with the right end of the feed screw 253, thereby preventing the feed screw 253 from rattling in the thrust direction. The left end of the feed screw 253 is elastically contacted with the inner surface of the bent edge 211 which is the left side surface portion of the mechanical chassis 200, and the bent edge 211 functions as a thrust receiver.

  Further, the pressing portion 257b of the preload spring 257 is elastically contacted with a portion adjacent to the right end of the feed screw 253 so as to press it toward the main surface portion 210 of the mechanical chassis 200, and thereby, near the right end of the feed screw 253. As for the portion, only the portion located on the upper side is received by the bearing portion 256, and the rattling is prevented.

  A media holder 300 that functions as a holder for holding the MD 12 is supported on the mechanical chassis 200 so as to be movable up and down (see FIGS. 22 and 23).

  A fulcrum lever 310 is interposed between the rear end portion of the media holder 300 and the rear end portion of the mechanical chassis 200 (see FIGS. 6, 7, and 22 to 25). The fulcrum lever 310 is made of a sheet metal material, and includes a connecting portion 311 formed as a side surface portion extending in the left-right direction and arm pieces 312 and 312 connected to both left and right end portions of the connecting portion 311 and extending substantially forward. And the front-end | tip part of the arm pieces 312 and 312 is connected with the rear-end part of the mechanical chassis 200 so that rotation is possible. A sliding shaft (second sliding shaft) 313 protrudes from the rear end portion of the left arm piece 312.

  The media holder 300 is formed of a sheet metal material, and includes a top plate portion 301, side plate portions 302, 302 that protrude downward from left and right side edges of the top plate portion 301 and are formed as side surfaces, and the side plate portions 302, 302. Supporting pieces 303 and 303 protruding from the lower edge toward each other are provided (see FIGS. 22 to 25). Connecting leg pieces 304 and 304 are suspended from the rear ends of the side plate portions 302 and 302 of the media holder 300, and the distal ends of the connecting leg pieces 304 and 304 are the base ends of the arm pieces 312 and 312 of the fulcrum lever 310. Part, that is, an end part on the connecting part 311 side, is rotatably connected. The rotation axis of the media holder 300 with respect to the fulcrum lever 310 coincides with the axis of the slide shaft 313 provided on the fulcrum lever 310.

  A part near the front end of the support piece 303 on the right side of the media holder 300 is cut and raised downward to form a spring hook piece 305 which is a second elastic body support piece for supporting one end of a toggle spring described later. .

  A sliding shaft (first sliding shaft) 306 projects from the outer surface of a substantially intermediate portion in the front-rear direction of the left side plate portion 302 of the media holder 300.

  The media holder 300 as described above is moved up and down with respect to the mechanical chassis 200 by a slider 320 that is a linear motion body that moves in the front-rear direction (see FIGS. 22 and 23).

  The slider 320 is made of a sheet metal material, and is slidably supported by the bent edge 211 on the left side of the mechanical chassis 200 in the front-rear direction. The slider 320 is formed on the spring hook 321 and the bent edge 211 formed on the slider 320. A forward moving force is urged by a tension coil spring 322 stretched between the spring hooking piece 211a.

  Cam slits 323 and 324 are formed in the slider 320 so as to be separated from each other in the front-rear direction. The front cam slit (first slit) 323 includes a horizontal portion 323a extending substantially horizontally on the front side and an inclined portion 323b extending downward and obliquely rearward from the horizontal portion 323a. The cam slit (second slit) 324 is connected to the rear end of the front horizontal portion 324a and the front horizontal portion 324b, which extends substantially horizontally on the front side, and the rear portion of the inclined portion 324b and the rear portion 324b extending downward and obliquely rearward therefrom. It consists of a rear horizontal portion 324c that continues to the end and extends horizontally backward from there.

  The sliding shaft 313 provided on the fulcrum lever 310 is slidably engaged with the rear cam slit 324, and the sliding shaft 306 provided on the media holder 300 is engaged with the front cam slit 323. It is slidably engaged.

  Therefore, the media holder 300 is moved up and down with respect to the mechanical chassis 200 by sliding the slider 320 in the front-rear direction.

  That is, when the slider 320 is at the front end of the moving range, the sliding shaft 313 is positioned at the rear horizontal portion 324c, and the sliding shaft 306 is positioned at the rear end of the inclined portion 323b, the media holder 300 is used. Is in a lowered state, that is, a state closest to the main surface portion 210 of the mechanical chassis 200 (see FIG. 22). The loading state (the position of the media holder 300 in this state is referred to as “loading position”) when the media holder 300 is in this state with the MD 12 held.

  From this state, when the slider 320 moves backward, the slide shafts 313 and 306 move relatively upward along the inclined portions 324b and 323b, respectively, and when the slider 320 reaches the rear end of the moving range. The sliding shaft 313 is positioned at the front horizontal portion, the sliding shaft 306 is positioned at the horizontal portion 323a, and the media holder 300 is in the most elevated state, that is, in the state that is most separated from the main surface portion 210 of the mechanical chassis 200. (See FIG. 23). This state is a standby state (when the MD 12 is not held) or an unloading state (when the MD 12 is held) (the position of the media holder 300 in this state is referred to as a “standby position” or an “unloading position”. ).

  As described above, by connecting the media holder 300 to the mechanical chassis 200 by the fulcrum lever 310, the sliding shafts 306 and 313 are merely engaged with the cam slits 323 and 324 (in order to suppress the back and forth movement). It is not necessary to engage with a slit extending in the vertical direction.) It can be moved only in the vertical direction and the size in the front-rear direction can be reduced.

  Further, as described above, by moving the media holder 300 in the vertical direction only on one side (left side), the dimension in the width direction can be reduced.

  As described above, the media holder 300 is supported by the mechanical chassis 200 at two points on the left side through the fulcrum lever 310 and the slider 320 and at one point at the rear end on the right side through the fulcrum lever 310. It is.

  Therefore, the media holder 300 is supported by the mechanical chassis 200 through the toggle spring 330 at the other right side thereof (see FIGS. 24 and 25).

  A spring hooking piece 216, which is a first elastic body supporting piece for supporting the other end portion of a toggle spring described later, is located at a position slightly forward from the center in the front-rear direction near the right edge of the main surface portion 210 of the mechanical chassis 200. The spring hooking piece 216 and the spring hooking piece 305 of the media holder 300 are respectively provided with a spring hooking hole (first support portion) 216 a which is a support portion of a toggle spring which is long in the front-rear direction. 305a is formed.

  The toggle spring 330 has a coil portion 331 and two arm pieces 332 and 333, and locking portions 334 and 334 are formed at the tips of the arm pieces 332 and 333. One arm piece 332 is formed in an L shape.

  The locking portion 334 of one arm piece 332 of the toggle spring 330 is locked to the spring hooking hole 305a of the spring hanging piece 305 of the media holder 300, and the locking portion 334 of the other arm piece 333 is the spring of the mechanical chassis 200. The hook 216 is locked in the spring hooking hole 216a.

  When the media holder 300 is in the standby state or unloading state, as shown in FIG. 24, the spring hooking hole 305a is located above the spring hooking hole 216a, and the locking portion 334 of the arm piece 332 is It is located at the front end of the spring hooking hole 305a, and the locking portion 334 of the arm piece 333 is located at the rear end of the spring hooking hole 216a. In this state, the elastic force of the toggle spring 330 lifts the media holder 300 upward. Works.

  When the media holder 300 is lowered from the state shown in FIG. 24 and the position of the spring hooking hole 305a is below the spring hooking hole 216a, the elastic force of the toggle spring 330 causes the media holder 300 to move the mechanical chassis 200. It acts to press against the main surface part 210 (see FIG. 25).

  As described above, when the right side portion of the media holder 300 is supported by only one point of the rear end portion, the position of the front portion becomes unstable, but this portion is supported by the toggle spring 330 as described above. When the media holder 300 is in a standby state or an unloading state by using a change in the direction in which the elastic force of the toggle spring 330 acts, the media holder 300 acts to maintain a predetermined height, When the media holder 300 is in the loading state, the media holder 300 can be pressed against the main surface portion 210 of the mechanical chassis 200 to stabilize the state of the media holder 300 at each position.

  Next, a mechanism for lowering the media holder 300 when the MD 12 is inserted into the media holder 300 and a mechanism for projecting the MD 12 from the media holder 300 when the MD 12 is ejected will be described (FIGS. 6 and 7). (See FIGS. 26 to 31).

  An eject lever 340, which is a rotational motion body, is rotatably supported on the left side of the rear end of the main surface 210 of the mechanical chassis 200 (see FIGS. 6, 26, and 27). The eject lever 340 is formed by integrally processing an arm part 341 and a controlled part 342 by processing a sheet metal material. The arm portion 341 extends substantially rightward from the right end portion of the controlled portion 342, and an abutting portion 341a that is convexly curved forward is formed at the tip portion. The upper end portion of the contact portion 341a protrudes upward from the other portions of the arm portion 341, and the upper end is formed at the rear end edge of the top plate portion 301 of the media holder 300 in the loading state. It is located in the notch 301a and is positioned above the support pieces 303, 303 of the media holder 300 in the standby state or unloading state (see FIG. 26).

  Further, the base end portion 341 b of the arm portion 341 protrudes downward, and its lower end portion is connected to the right end portion of the controlled portion 342. In such an eject lever 340, the arm portion 341 is positioned above the main surface portion 210 of the mechanical chassis 200, and the controlled portion 342 is positioned below the main surface portion 210.

  The controlled portion 342 is substantially L-shaped when viewed from above, and the bent portion of the L-shape is freely rotatable on the main surface portion 210 by the shaft 342a while being positioned on the lower surface side of the main surface portion 210 of the mechanical chassis 200. (See FIGS. 28 to 31). A spring hanging piece 343 is suspended from an inner bending point of the L-shaped portion of the controlled portion 342, and the spring hanging piece 343 and the spring hanging piece 217 suspended from the main surface portion 210 of the mechanical chassis 200. A tension coil spring 344 is stretched between them, and thereby the turning force in the counterclockwise direction as viewed from above is applied to the eject lever 340.

  The rear end edge 345 of the portion extending substantially rearward of the controlled portion 342 is a gently arcuate stopper edge (stopper portion), and the right edge 346 of the rearward extending portion extends substantially in the front-rear direction. . A pressed piece (pressed part) 347 is suspended along the left edge of the controlled part 342. In the pressed piece 347, the rear half part 347a and the front half part 347b are formed continuously, and the front half part 347b is substantially straight in the front-rear direction in a state where the arm part 341 extends substantially in the left-right direction. The rear half part 347a is formed so as to extend slightly rearward from the rear end of the front half part 347b.

  A support plate 325 that protrudes to the right and is formed as a support portion is integrally formed on the lower edge of the rear end portion of the slider 320 (see FIGS. 28 to 31). The support plate 325 is located below the controlled portion 342 of the eject lever 340.

  A stopper piece (stopped portion) 326 protrudes upward at the right end of the rear edge of the support plate 325. The left end portion 327 of the stopper piece 326 is bent at a right angle toward the rear. A collar 328 is rotatably supported on the upper surface of the stopper piece 326 at a position slightly to the left from the left end.

  Thus, when the slider 320 is positioned at the rear end of the moving range, that is, when the media holder 300 is in the standby state or the unloading state, the eject lever 340 is in the position rotated most counterclockwise, Further, the stopper piece 326 of the slider 320 is brought into contact with the stopper edge 345 of the eject lever 340 from the front, and the slider 320 is locked in a state positioned at the rear end of the moving range (see FIG. 28).

  Therefore, when the MD 12 is inserted into the media holder 300, the abutment portion 341a of the eject lever 340 is pressed backward by the tip thereof, whereby the eject lever 340 rotates clockwise as viewed from above. Moved. When the eject lever 340 is rotated in the clockwise direction, the stopper edge 345 moves almost to the left, and the right end of the stopper edge 345 eventually corresponds to the left end 327 of the stopper target piece 326 of the slider 320. (See FIG. 29). At this time, the collar 328 of the slider 320 is located slightly opposite the right side surface of the rear half 347a of the pressed piece of the eject lever 340 (see FIG. 29).

  When the right end of the stopper edge 345 of the eject lever 340 is disengaged leftward from the left end 327 of the stopper piece 326 of the slider 320, the slider 320 is moved forward by the tensile force of the tension coil spring 322, and the collar 328 is moved. The eject lever 340 comes into contact with the right side surface of the rear half 347a of the pressed piece 347 (see FIG. 30).

  After the collar 328 comes into contact with the right side surface of the rear half 347a of the pressed piece 347, the slider 320 moves further forward so that the collar 328 presses the right side surface of the rear half 347a leftward. As a result, the eject lever 340 is slightly rotated in the clockwise direction. This is because the media holder 300 has a rear end connected to the mechanical chassis 200 via a fulcrum lever 310, and a rear end where the fulcrum lever 310 is connected to the media holder 300 during loading is a main surface portion of the mechanical chassis 200. Since the rear end moves slightly rearward from the position located slightly above 210 to the same height as the main surface portion 210, the media holder 300 moves slightly rearward accordingly. If the eject lever 340 is left as it is, the MD 12 is pushed forward by the eject lever 340 due to the backward movement of the media holder 300. Therefore, the eject lever 340 is further rotated in the clockwise direction as described above so that the contact portion 341a escapes backward together with the tip of the MD 12 moving backward. Further, the left end portion 327 of the stopper edge 326 of the slider 320 is separated from the right edge 346 following the stopper edge 345 of the eject lever 340 by the rotation of the eject lever 340.

  When the slider 320 reaches the front end of the moving range, the collar 328 comes into contact with the right side surface of the front half 347b of the pressed piece 347 of the eject lever 340, and the eject lever 340 is in the front half 347b of the pressed piece 347. When the right side surface abuts on the collar 328, rotation in the counterclockwise direction, that is, rotation that pushes the loaded MD 12 forward is prevented (see FIG. 31).

  In the meantime, the media holder 300 is in a loading state. At this time, since the fulcrum lever 310 is pivoted so as to fall backward, the media holder 300 is lowered to the loading position while being pulled slightly backward, and thus has been manually inserted into the media holder 300 halfway. The MD 12 is automatically pulled in from the middle.

  When the slider 320 is moved rearward from the front end of the moving range, the media holder 300 is raised toward the unloading position as described above. When the left end portion 327 of the stopper piece 326 is moved behind the rear end of the right edge 347 following the stopper edge 346 of the eject lever 340, the eject lever 340 rotates counterclockwise as viewed from above by the tensile force of the tension coil spring 344. The stopper edge 345 engages with the stopper piece 326 of the slider 320 to lock the slider 320 to the rear end of the moving range, and the abutting portion 341a of the arm portion 341 presses the MD12. Then, a part of the protruding portion is protruded forward from the media holder 300 so that the protruding portion can be grasped and taken out to the outside.

  As described above, the timing of moving the slider 320 forward and starting to lower the media holder 300 toward the loading position is relative to the right end of the stopper edge 345 of the eject lever 340 and the left end of the stopper piece 326 of the slider 320. Since it is determined by the target positional relationship, accurate timing can be taken. Further, the retracting of the contact portion 341a of the arm portion 341 of the eject lever 340 is performed when the collar 328 of the slider 320 presses the right side surface of the rear half portion 347a of the pressed piece 347 of the eject lever 340. The amount of power required is light.

  When the MD 12 is loaded, a guide shaft 218 that guides the MD 12 to a predetermined mounting position and a positioning protrusion 219 for positioning the MD 12 at a predetermined position are provided on the main surface portion 210 of the mechanical chassis 200. (See FIGS. 6 and 32 to 34).

  The guide shaft 218 is provided at a position to the left of the front end portion of the main surface portion 210. The guide shaft 218 includes a base portion 218a having a circular shape and a guide portion protruding from the base portion 218a. The guide portion is a base portion. A cylindrical portion 218b having a short cylindrical shape having an outer diameter slightly smaller than 218a and a conical portion 218c that is continuous and substantially conical on the cylindrical portion 218b. And the cone part 218c is formed in the shape where the axis | shaft fell slightly to the front side.

  The positioning protrusion 219 protrudes to the left of the rear end portion of the main surface portion 210, and has a flat base portion 219a having a circular shape and an outer diameter of the base portion that is slightly smaller than the base portion 219a and has a short conical shape. The positioning portion 219b, which is a conical portion, has a function as a guide shaft.

  Thus, in the process in which the media holder 300 holding the MD 12 reaches the loading position described above (see FIG. 32), first, the guide formed on the bottom surface of the MD 12 where the tip of the conical portion 218c of the guide shaft 218 serves as a guided object. It is relatively inserted into the circular positioning hole 12a functioning as a hole (see FIG. 33). As the media holder 300 is further lowered, the positioning hole 12a is guided by the conical portion 218c of the guide shaft 218 and finally engages with the cylindrical portion 218b (see FIG. 34). Further, at the same time when the positioning hole 12a engages with the cylindrical portion 218b, the positioning hole 12b that is formed on the opposite side of the bottom surface of the MD 12 from the position where the positioning hole 12a is formed and functions as a guide hole that is long in the front-rear direction. While being guided by the positioning portion 219b, it finally engages with the base portion, and thereby, the MD 12 is positioned with respect to the main surface portion 210 of the mechanical chassis 200 (see FIG. 34).

  Then, when the MD 12 is inserted into the media holder 300, the shutter 12 c is opened, and when the media holder 300 reaches the loading position, the disk 12 d of the MD 12 is placed and held on the turntable 222.

  The guide shaft 218 and the positioning projection 219 described above can be formed by press molding at the same time when the mechanical chassis 200 is press molded. That is, taking the example of the guide shaft 218, as shown in FIGS. 35 to 39, the guide shaft 218 having a complicated shape can be easily formed by narrowing down in several stages. In addition, the positional accuracy with respect to the mechanical chassis 200 is higher than when a separate member is attached to the mechanical chassis to form the guide shaft, and a complicated shape that is difficult to be formed by cutting, for example, the guide shaft described above. As shown by 218, a conical portion 218c whose axis is inclined can be easily formed.

  The slider 320 is ejected in the ejecting direction, that is, moved rearward by moving the eject knob 350 supported on the left side surface portion of the outer casing 2 so as to be movable in the front-rear direction, thereby moving the left side surface portion 130 of the main chassis 100 to the rear side. The relay slider 360 is supported so as to be freely movable in the front-rear direction (see FIGS. 46 to 49).

  The relay slider 360 is made of a sheet metal material, and is supported on the inner surface of the left side surface 130 so as to be movable in the front-rear direction. The relay slider 360 is provided with a forward moving force by a tension coil spring 361 stretched between the left side surface portion 130. It is energized. A pressing protrusion 362 that protrudes inward is formed on the upper edge of the rear end of the relay slider 360. Further, a pressed piece 363 that protrudes outward is formed at the front end edge of the relay slider 360. The pressed piece 363 protrudes to the outside of the left side surface portion 130 through an opening 131 (see FIG. 3) formed in the left side surface portion 130 of the main chassis 100 and extending in the front-rear direction.

  Two ejecting protrusions 351 and 352 are provided on the inner surface of the eject knob 350 so as to be separated from each other in the front-rear direction, and the rear pressing protrusion 352 contacts the front surface of the pressed piece 363 of the relay slider 360. (See FIG. 46). Further, a pressed piece 329 protruding outward is formed at the upper end of the portion near the rear end of the slider 320, and the slider 320 is in the front end of the moving range, that is, the media holder 300 is at the loading position. In a certain state, the pressed piece 329 is in contact with the pressing protrusion 362 of the relay slider 360 from behind.

  Thus, the MD 12 loaded is ejected by moving the eject knob 350 backward. That is, when the eject knob 350 is moved backward, the relay slider 360 is moved backward by being pressed by the pressing protrusion 352 (see FIGS. 47 to 49), and the pressing protrusion 362 is pressed by the slider 320. The piece 329 is pushed rearward, whereby the slider 320 moves rearward and the media holder 300 is raised and moved to the unloading position, whereby the MD 12 is ejected.

  Next, opening and closing of the cover body 8 will be described (see FIGS. 40 to 54).

  The cover body 8 is rotatably supported by the main chassis 100. The cover body 8 is formed of a metal member, and includes a main body portion 400 that closes the opening 7 of the outer casing 2 and arm portions 401 and 402 that protrude substantially rearward from the left and right side portions of the main body portion 400 (see FIG. 40). The rear end portions of the arm portions 401 and 402 are rotatably supported by the left side portion 130 and the right end portion 120 of the main chassis 100. Further, a spring hooking piece 403 protrudes rearward from the lower edge of the right arm portion 402 near the rear end. The spring hooking piece 403 and the front end of the right side surface 120 of the main chassis 100 are located near the rear edge. A tension coil spring 404 is stretched between the spring hooking piece 121 projecting from the lower edge of the portion (see FIGS. 4 and 40), whereby the cover body 8 is counterclockwise as viewed from the left. That is, the turning force in the direction of closing the opening 7 is urged. Note that this turning force is not so strong, and it is sufficient if the cover body 8 is sufficient to rotate the cover body 8 to the closed position where the opening 7 is closed.

  An engaging piece 405 that functions as a locked portion protrudes from the lower edge of the front end portion of the left side surface of the left arm portion 401, and a pressing surface 406 facing downward is formed at a position above the engaging piece 405. Has been. In addition, a pressed surface (second pressed portion) 407 is formed continuously to the rear end of the pressing surface 406 so as to face downward and incline backward.

  Further, three ribs 408, 408, 408 protrude from the inner surface of the main body 400 at substantially equal intervals on the left and right, and the lower edges 408 a, 408 a, 408 a of these ribs 408, 408, 408 are pressed edges ( First pressed portion).

  A lock slider 410 as a locking means is supported on the inner surface of the left side surface portion 130 of the main chassis 100 so as to be movable in the front-rear direction (see FIGS. 41 to 54). The lock slider 410 has long holes 411 and 412 formed in the lock slider 410 supported by support pins 132 and 133 implanted in the left side surface 130 so as to be movable in the front-rear direction. The front slot 411 includes a front portion 411a and a rear portion 411b continuous to the rear end of the front portion 411a. The rear portion 411b is located slightly above the front portion 411a.

  A spring hooking piece 413 protrudes from the lower edge of the rear end of the lock slider 410, and between the spring hooking piece 413 and the spring hooking piece 134 protruding from the lower edge of the left side surface 130 of the main chassis 100. A tension coil spring 420 is stretched, and thereby, a forward moving force is urged on the lock slider 410. Accordingly, the lock slider 410 is positioned at the front end of the moving range in a state where no backward moving force is applied thereto (see FIG. 41).

  A lock piece 414 that functions as a lock portion for locking the cover body 8 is provided at the front end portion of the lock slider 410. That is, the lock piece 414 protrudes upward from the upper edge of the front end portion of the lock slider 410, and the lock claw 414 a protrudes forward from the upper end portion of the lock piece 414.

  A pressed piece 415 protrudes upward from the rear end of the lock slider 410, and a pressed part 415 a is formed at the front end of the pressed piece 415. Further, a stopper piece (first stopper portion) 416 protrudes upward at a position slightly ahead of the rear end of the upper edge of the lock slider 410. A stopper piece 417 that protrudes outward, that is, toward the left is provided at a position near the front edge of the upper edge of the slider 320.

  Further, a temporary stop piece 135 is provided at the front end of the left side surface 130 of the main chassis 100 so as to project inward, that is, toward the right.

  Thus, the cover body 8 is locked in the closed position where the opening 7 is closed while the media holder 300 is in the loading position. That is, the slider 320 is located at the front end of the movement range, and the relay slider 360 and the lock slider 410 are both located at the front end of the movement range. Further, the eject knob 350 is also positioned at the front end of the moving range by receiving the moving force biased by the relay slider 360 via the pressed piece 363 and the pressing protrusion 352 of the relay slider 360. In a state where the lock slider 410 is positioned at the front end of the moving range, the rear portion 411b of the front elongated hole 411 is engaged with the support pin 132, and the lock claw 414a is engaged with the cover body 8. The cover piece 8 is locked in the closed position by engaging with the joining piece 405 (see FIGS. 41 and 46).

  As described above, in a state where the MD 12 is loaded, the lock claw 414a of the lock slider 410 is engaged with the engagement piece 405 of the cover body 8, whereby the cover body 8 is locked in its closed position. Therefore, the cover body 8 is not inadvertently rotated to the open position.

  Further, in a state where the media holder 300 is in the loading position, the pressed piece 329 of the slider 320 approaches or abuts the pressing protrusion 362 of the relay slider 360 from behind, and the pressed piece 363 of the relay slider 360 is ejected 350. The pressed portion 415a of the lock slider 410 comes into contact with the pressing protrusion 351 of the eject knob 350 from the rear, and the stopper piece 416 of the lock slider 410 is the stopper piece of the slider 320. It is close to 417 from behind (see FIG. 46).

  And when ejecting MD12, the eject knob 350 is moved back.

  When the eject knob 350 moves rearward, the pressing protrusion 352 presses the pressed piece 363 of the relay slider 360 toward the rear to move the relay slider 360 rearward, and the pressing protrusion 351 of the eject knob 350 is also moved. Then, the pressed portion 415a of the lock slider 410 is pressed rearward to move the lock slider 410 rearward. As a result, the lock claw 414a of the lock slider 410 is disengaged rearward from the engagement piece 405 of the cover body 8, and the lock on the cover body 8 is released (see FIGS. 42 and 47). During this time, the media holder 300 moves to the unloading position, and the MD 12 is ejected.

  When the MD 12 is ejected, the cover body 8 is rotated so as to open the opening 7 against the resilience of the tension coil spring 404 energizing the rotational force.

  When the media holder 300 is raised toward the unloading position, the lower edges of the ribs 408, 408, 408 of the cover body 8, that is, the pressed edges 408a, 408a, are held by the MD 12 held by the media holder 300. , 408a are pressed upward, whereby the cover body 8 is rotated toward the open position where the opening 7 is opened (see FIGS. 43 to 48).

  When the cover body 8 is opened to some extent, the rear end of the upper edge of the lock piece 414 of the lock slider 410 that is moving backward contacts the pressed surface 407 of the cover body 8 (see FIG. 44), and from there When the lock slider 410 further moves rearward, the rear end of the upper edge of the lock piece 414 presses the pressed surface 407, whereby the cover body 8 is rotated to the open position (FIGS. 45 and 49). reference). Therefore, in this case, the lock slider 410 functions as a pressing means, and the lock piece 414 functions as a pressing portion. Therefore, a part of the MD 12 is projected from the opening 7 to the outside by the eject lever 340.

  As described above, when the MD 12 is ejected, the cover body 8 is rotated to the open position so that the cover body 8 is rotated halfway by the rising MD 12, and then the cover body 8 is rotated. By making the lock piece 414 press the pressed surface 417, the load on the MD12 can be reduced without increasing the size of the device, and the MD12 can be smoothly ejected. And

  When the force that pushes the ejector 350 backward is removed, the ejector 350 receives the forward moving force by the tension coil spring 361 biased by the relay slider 360, the pressed piece 363 of the relay slider 360, the ejector It receives through the pressing projection 352 of the child 350 and returns to the front end of its moving range.

  When the eject knob 350 moves to the front end of the moving range, the pressing protrusion 351 moves away from the pressed portion 415 a of the lock slider 410, so that the lock slider 410 moves forward by the tensile force of the tension coil spring 420. However, as described above, since the slider 320 is locked in a state where the slider 320 has moved to the rear end of the moving range, the stopper piece 417 has also moved rearward, and the stopper piece of the lock slider 410 trying to return to the front. 416 abuts against the stopper piece 417 of the slider 320 on the way, and further forward movement is prevented (see FIG. 50). Therefore, in this case, the slider 320 functions as a stopping means (first stopping means) that prevents the movement of the lock slider 410, and the stopper piece 417 functions as a stopper portion (first stopper portion).

  In a state where the stopper piece 416 of the lock slider 410 abuts against the stopper piece 417 of the slider 320 and the lock slider 410 is prevented from further forward movement, the lock piece 414 of the lock slider 410 is not attached to the cover body 8. Since it is located in front of the pressed surface 407, when the MD 12 is taken out from the MD playback device 1, there is nothing to keep the cover body 8 in the open position, so the cover body 8 is biased to it. It is rotated to the closing position by the rotational force of the tension coil spring 404, and thereby the opening 7 of the outer casing 2 is closed (see FIG. 51).

  In the state where the MD 12 is ejected (discharged), as described above, the media holder 300 is positioned at the standby position, and the cover body 8 is at the closed position only by the urging force of the tension coil spring 404 (see FIG. 51). Accordingly, when the MD 12 is pushed in after the insertion tip of the MD 12 is inserted into the insertion recess 11, the pushing force pushes the inclined surface of the cover body 8, and a turning force is applied to the cover body 8 toward the open position. As a result, the opening 7 is opened, and the MD 12 is inserted as it is (see FIG. 52).

  When the MD 12 is almost inserted, as described above, the MD 12 is automatically retracted, the cover body 8 moves to the closed position, and the MD 12 is mounted at a predetermined mounting position.

  In this process, the operation of locking the cover body 8 at the closed position will be described (see FIGS. 52 to 54).

  That is, the MD 12 is inserted into the media holder 300 (see FIG. 52), the eject lever 340 is rotated by the MD 12, the lock to the slider 320 by the stopper edge 345 of the eject lever 340 is released, and the slider 320 is moved. The media holder 300 moves downward toward the loading position while moving forward by the urging force of the tension coil spring 322.

  When the stopper piece 417 moves forward by the advance of the slider 320, the lock slider 410 moves forward by the urging force of the tension coil spring 420. However, the lock slider 410 has a front elongated hole 411 and a spring hook piece in which a boundary portion between the front portion 411a and the rear portion 411b is engaged with the support pin 132 and the tensile force of the tension coil spring 420 is exerted. Because of the positional relationship of 413, the lock slider 420 is energized in the direction in which the front end thereof is displaced upward with the engaging portion of the long hole 412 and the support pin 133 as a rotation axis. The front end edge (second stopper target portion) 418 contacts the temporary stop piece 135 of the main chassis 100 and is prevented from further forward movement, and is positioned in a state of being separated from the stopper piece 417 of the slider 320 ( (See FIG. 53). Accordingly, in this case, the main chassis 100 functions as a stopping means (second stopping means) for stopping the lock slider 410, and the temporary stopping piece 135 functions as a stopper portion 8 (second stopper portion).

  Therefore, when the MD 12 is loaded and the cover body 8 is turned to the closed position, the pressing surface 406 that functions as a release portion for releasing the lock is placed on the upper edge of the lock piece 414 of the lock slider 410. By pushing downward (see FIG. 54), the lock slider 410 is rotated so that its front end moves downward, and its front edge 418 is released downward from the temporary stop piece 135 of the main chassis 100, Advancing by the tensile force of the tension coil spring 420, the lock claw 414a engages with the engagement piece 405 of the cover body 8 in the closed position, and locks the cover body 8 in the closed position (see FIG. 46).

  A battery case 500 serving as a battery storage case for storing a battery to be described later is supported at the rear end of the main chassis 100 (see FIG. 55).

  The case body 510 is formed of an insulating material, for example, a synthetic resin, and has a cylindrical shape with both left and right ends opened (see FIGS. 55 and 56). That is, a semi-cylindrical portion is formed continuously on the lower surface of a rectangular tube that is flat vertically and long in the left-right direction, and an upper rectangular tube-shaped space 511 that is a storage space for storing a battery. And the lower semi-cylindrical space 512 are continuous.

  Such a case body 510 is fixed to the rear end portion of the main chassis 100 by screws or the like.

  The opening 513 on the right side of the case body 510 is opened and closed by the lid portion 520 (see FIGS. 55 to 58). The lid portion 520 is composed of a synthetic resin lid body 530, a hinge body 540 made of a conductive material, and a negative contact plate 550 made of the same conductive material, and a case main body 510 via a fulcrum plate 560 made of a conductive material. Attached to.

  The lid main body 530 has a main portion 531 that is substantially the same size as the opening end of the case main body 510 and a front end edge of the inner surface of the main portion 531 (the portion on this side with respect to the lid portion 520 is referred to as a “base end portion”). A peripheral wall portion 532 projecting from the removed peripheral edge, and upper and lower end portions of a portion of the peripheral wall portion 532 located at the rear edge (referred to as the “front end portion” with respect to the lid portion 520). Engagement pieces 533 and 533 protrude from the inner surface and at a position separated from the main portion 531.

  In addition, supported pieces 534 and 534 extending in the front-rear direction are provided at positions near the upper and lower edges of the center portion in the front-rear direction on the inner surface of the main portion 531. The amount of protrusion of the supported pieces 534 and 534 from the main portion 531 is substantially the same as that of the peripheral wall portion 532, and supported grooves 534a and 534a extending in the front-rear direction are formed on the surfaces facing the protruding ends. ing. Further, a retaining piece 535 protrudes from the inner surface of the main portion 531 at a position slightly proximal to the supported pieces 534 and 534. Further, a compression projection 536 is provided at a portion slightly on the distal end side from the retaining piece 535, and a surface 536a on the proximal end side of the compression projection 536 is formed as an inclined surface with a projection amount increasing toward the distal end side. Yes.

  The hinge body 540 is formed in a frame shape slightly smaller than the lid main body 530, and supported pieces 541 and 541 projecting outward are formed at both upper and lower ends of the base end portion, and the supported pieces 541 and 541 are covered. Support holes 541a and 541a are formed. Further, an elastic piece 542 projects from the distal end portion toward the proximal end portion and slightly outward.

  Thus, the upper and lower edges of the hinge body 540 are slidably engaged with the supported grooves 534a and 534a from the base end side of the lid body 530. Then, when the hinge body 540 is moved to the tip end side of the lid main body 530, the elastic piece 542 is moved inward by the retaining piece 535 of the lid main body 530 while being bent inward, and the retaining piece 535 is After bending over to the front end side, it was bent back and its front end engaged with the front end side surface of the retaining piece 535, so that the lid body 530 and the hinge body 540 were movable in the front-rear direction. However, they are coupled in a state where they are prevented from coming off by engagement of the retaining pieces 535 and the elastic pieces 542 (see FIG. 57).

  The negative contact plate 550 has an elastic piece 552 that functions as a negative terminal portion from the edge on the distal end side of the base portion 551 having a vertical width that is substantially the same as the vertical width of the proximal end portion of the hinge body 540. A contact pin 553 protrudes inward from the tip of the elastic piece 552. Further, a connection piece 554 projects outward from the lower edge of the base 551, and an insertion hole 554a is formed in the connection piece 554.

  The base portion 551 of the negative contact plate 550 is fixed to the inner surface of the base end portion of the hinge body 540 by spot welding, so that the elastic piece 552 is a contact that is a negative terminal inside the frame formed by the hinge body 540. The pin 553 is positioned substantially at the center of the lid portion 520, the connection piece 554 is positioned so as to overlap the lower side of the supported piece 541 on the lower side of the hinge body 540, and the insertion hole 554a is located on the lower side of the hinge body 540. It becomes the state aligned with the supported hole 541a of the supported piece 541.

  The fulcrum plate 560 has support pieces 562 and 563 projecting forward from the upper and lower edges of the right end of the substantially plate-shaped main portion 561 extending in the left-right direction. Each support piece 562 and 563 has a support hole 562a, 563a is formed. Further, a connection piece 564 projects from the front edge of the lower support piece 563 toward the front.

  Thus, the fulcrum plate 560 has a main portion 561 fixed to the right end of the front wall of the case body 510 by screws, and a connection piece 564 fixed to the main chassis 100 to a power circuit of a printed wiring board (not shown). Soldered.

  The supported pieces 541 and 541 of the hinge body 540 and the connection piece 554 of the negative contact plate 550 are overlapped with the support pieces 562 and 563 of the fulcrum plate 560, respectively. At this time, the connection piece 554 of the negative contact plate 550 is superimposed on the upper support piece 563 on the lower side of the fulcrum plate 560. Then, the hinge shaft 555 is inserted into the support hole 562a, the supported holes 541a and 541a, the insertion hole 554a, and the support hole 563a, whereby the hinge body 540 is rotatably supported by the fulcrum plate 560. Further, the minus contact plate 550 is connected to a power circuit of a printed wiring board (not shown) through a fulcrum plate 560.

  An engaging portion 514 projects outwardly from the opening end surface of the case body 510, that is, the rear edge portion of the right end surface. The vertical width of the engaging part 514 is slightly smaller than the vertical distance of the peripheral wall part 532 of the lid body 530. In addition, slits 514a and 514a are formed at both upper and lower ends of the engaging portion 514, respectively.

  When closing the opening 513 of the case main body 510 with the lid 520, the lid main body 530 is moved to the distal end side with respect to the hinge body 540 (see FIG. 58), and the opening 513 is closed in that state. Thus, the fulcrum plate 560 is rotated. As a result, the opening 513 is closed by the lid body 530, and the portion of the peripheral wall portion 532 on the front end side covers the engagement portion 514 of the case body 510. From this state, when the lid main body 530 is moved to the proximal end side with respect to the hinge body 540, the engagement pieces 533 and 533 are engaged with the slits 514 a and 514 a of the case main body 510. The elastic piece 542 is bent to the left by pressing the inclined surface 536a of the compression projection 536 of the lid main body 530 toward the distal end side, whereby the frictional force between the elastic piece 542 and the inclined surface 536a is increased. Thus, the lid 520 is locked in a state where the opening 513 of the case body 510 is closed (see FIG. 59).

  Further, when opening the opening 513 of the case main body 510, the lid main body 530 is moved toward the distal end side with respect to the hinge body 540 so that the engagement pieces 533 and 533 are pulled out from the slits 514a and 514a of the case main body 510. At the same time, the pressure contact state between the elastic piece 542 of the hinge body 540 and the inclined surface 536a of the compression protrusion 536 of the lid body 530 is released (see FIG. 58). As a result, the lock of the lid portion 520 to the closed position is released, so that the lid portion 520 can be rotated to open the opening 513.

  A terminal block 570 is slidably disposed in the left-right direction at the left end portion of the case body 510.

  A terminal block 570 functioning as a positive terminal portion includes a terminal holder 580 made of an insulating material and a positive terminal plate 590 supported by the terminal holder 580 (see FIG. 60).

  The terminal holder 580 is made of an insulating material, for example, synthetic resin, and has a base portion 581 having a square plate shape in a planar shape, side surfaces 582 and 582 protruding upward from both front and rear edges of the base portion 581, and the base portion 581. A left side surface portion 583 provided so as to bridge between the left edge and the left end portion of the side surface portions 582 and 582 and a right side surface portion 584 protruding downward from a portion excluding the front end portion of the right side edge of the base portion 581 are integrally formed. Formed. The left end of each of the side surfaces 582 and 582 protrudes slightly to the left from the left edge of the base portion 581, and the flange 585 extends so as to bridge the upper edge of the left end and the upper edge of the left side surface 583. It is integrally formed.

  On the surfaces of the left end portions of the side surface portions 582 and 582 facing each other, protrusions 582a and 582a extending in the vertical direction are provided so as to form grooves 582b and 582b between the left side surface portion 583. Engagement holes 582c and 582c are formed at the upper end of the side portions 582 and 582 where the grooves 582b and 582b are formed. Further, guided projections 582d and 582d are provided so as to project at a substantially central position in the vertical direction of the outer surfaces of the left end portions of the side surfaces 582 and 582.

  A lower end portion of the rear side surface portion 582 protrudes slightly downward, and a protrusion 581a extending from a position corresponding to the front end of the right side surface portion 584 to the left end of the lower surface of the base portion 581 is formed. An arrangement recess 581 b is formed on the lower surface of 581. The right end of the protrusion 581a and the side surface 582 protrudes further downward, and guided protrusions 581c and 581c protrude outwardly from the protruding portion.

  A hole 584 a is formed at the center of the upper end portion of the right side surface portion 584, and a stopper projection 584 b is projected from the lower end portion of the left side surface of the right side surface portion 584. The facing hole 584a has an outer shape that allows insertion of a plus electrode of a gum type battery and an AA type battery, which will be described later.

  A facing hole 583a is formed in the central portion of the left side surface portion 583, and the facing hole 583a has the same size as the facing hole 584a so that a plus electrode of a gum type battery and an AA type battery can be inserted. Is formed.

  The positive terminal plate 590 is formed of a conductive metal plate, and has an intermediate portion 591 that is substantially rectangular in a planar shape, and protrudes downward from the right edge of the intermediate portion 591 and has a terminal on the positive side of the AA battery described later. The AA-type terminal portion 592 and the gum-type terminal portion 593 projecting upward from the left edge of the intermediate portion 591 and serving as a positive-side terminal of the gum-type battery described later are integrally formed.

  The intermediate portion 591 is formed to fit in the placement recess 581b of the terminal holder 580, and the AA terminal portion 592 is formed to fit within the size of the right side surface portion 584 of the terminal holder 580. In addition, a protrusion 592a that protrudes slightly above the upper surface of the intermediate portion 591 is formed at the center of the upper edge. The gum-type terminal portion 593 is formed to be slightly smaller than the left side surface portion 583 of the terminal holder 580.

  The positive terminal plate 590 is arranged such that the AA terminal portion 592 is in close contact with the left side surface of the right side surface portion 584 of the terminal holder 580, and the protrusion 592 a is the front end of the base portion 581 of the terminal holder 580. In addition, the lower edge of the AA type terminal portion 592 engages with a stopper projection 584b formed on the left side surface of the right side surface portion 584 of the terminal holder 580, whereby the plus terminal plate 590 is moved to the left side. It will be in the state where the movement to the direction and the downward direction was prevented. In addition, a part thereof faces rightward from a facing hole 584a formed in the right side surface portion 584.

  Further, the gum-type terminal portion 593 is brought into close contact with the left side surface of the left side surface portion 583 of the terminal holder 580, and a part of the gum type terminal portion 593 faces rightward from a facing hole formed in the left side surface portion 583.

  The plus terminal board 590 is connected to a flexible printed wiring board connected to a power circuit of a printed wiring board (not shown).

  As described above, the holding plate 586 is attached to the left end portion of the terminal holder 580 to which the plus terminal plate 590 is attached. The pressing plate 586 is formed of an insulating material, for example, synthetic resin, and has a plate shape slightly smaller than the left side surface portion 583, and the engagement pieces 586a and 586a protrude upward from the lower ends of the front and rear side edges. Engagement claws 586b and 586b projecting forward and rearward are formed at the upper ends of the engagement pieces 586a and 586a, respectively. Further, a positioning projection 586c is projected from the substantially central portion of the left side surface of the presser plate 586.

  The presser plate 586 is inserted into the grooves 582b and 582b formed at the left end portion of the terminal holder 580 from below so as to be located on the left side of the gum terminal portion 593 of the plus terminal plate 590. Then, when the grooves 582b and 582b are inserted to predetermined positions, the engaging claws 586b and 586b engage with the engaging holes 582c and 582c of the terminal holder 580, and thereby, from the terminal holder 580 of the presser plate 586. Is prevented from falling off. In this way, the left side of the gum-type terminal portion 593 of the plus terminal plate 590 is held by the holding plate 586, and this also prevents the plus terminal plate 590 from moving to the left with respect to the terminal holder 580. In this way, the terminal block 570 is formed.

  Guide grooves 511a and 511a extending from the left end to the right are formed on both front and rear inner surfaces of the square cylindrical space 511 of the case body 510, and close to the square cylindrical inner surface 511 on the front inner surface of the semicylindrical space 512. Guide grooves 512a and 512a extending from the left end to the right are formed in the part.

  Accordingly, the terminal block 570 has its guided projections 582 d and 582 d slidably engaged with the guide grooves 511 a and 511 a of the case body 510, and the guided projections 581 c and 581 c of the terminal block 570 are guided grooves of the case body 510. 512a and 512a are slidably engaged with each other, and are thereby supported by the case body 510 so as to be movable in the left-right direction within the range of the length of the guide grooves 511a, 511a, 512a, and 512a. A compression coil spring 587 that is externally fitted to the positioning projection 586c is contracted between the inner surface of the rear end portion of the left side surface portion 130 of the main chassis 100 and the left side surface of the holding plate 586 of the terminal block 570. The terminal block 570 is biased with a moving force toward the right.

  The above-described battery case 500 can be selectively mounted with so-called gum type batteries 601 and AA batteries 602 having a flat prismatic shape.

  The gum type battery 601 is mounted in the square cylindrical space 511 with the positive electrode 601a facing left (see FIG. 61). When the gum type battery 601 is inserted into the rectangular tube-shaped space 511 and the lid portion 520 is closed, the contact pin 553 of the minus terminal plate 550 provided on the lid portion 520 is elastically contacted with the minus electrode 601b of the gum type battery 601. Further, since the positive electrode 601a of the gum type battery 601 faces the gum type terminal portion 593 of the terminal block 570 through the hole 583a and presses it to the left, the terminal block 570 is a compression coil spring. Move 587 to the left while compressing 587. In this manner, the gum type battery 601 is elastically held from both the positive electrode 601a and the negative electrode 601b, and is thereby securely connected to a power supply circuit of a printed wiring board (not shown).

  The AA battery 602 is mounted in a space formed by a semi-cylindrical space 512 and a rectangular tube-shaped space 511 with the plus electrode 602a facing left (see FIG. 62). When the AA battery 602 is inserted into the spaces 511 and 512 and the lid 520 is closed, the contact pin 553 of the negative terminal plate 550 provided on the lid 520 is connected to the negative electrode 602b of the AA battery 602. Since the positive electrode 602a of the AA battery 602 faces the AA terminal portion 592 of the terminal block 570 and contacts through the hole 584a and presses it to the left, the terminal block 570 moves to the left while compressing the compression coil spring 587. In this manner, the AA battery 602 is elastically held from both the positive electrode 602a and the negative electrode 602b, and is thereby securely connected to a power supply circuit of a printed wiring board (not shown).

  As described above, in the battery case 500, the gum-type battery 601 and the AA battery 602 can be selectively used, and the terminal block 570 is arranged in the left-right direction, that is, these batteries 601, Since it is movable in the longitudinal direction of 602, it is possible to absorb variations in the size of the batteries 601 and 602. Further, since the terminal portions 593 and 592 and the contact pins 553 are in elastic contact with the positive electrodes 601a and 602a and the negative electrodes 601b and 602b of the batteries 601, 602, the batteries 601 and 602 are instantaneously caused by an external shock. Even if it moves to each other, the terminal portions 593 and 592 and the contact pins 553 instantaneously follow the terminals 601a, 602a and 601b and 602b of the batteries 601 and 602, thereby preventing an instantaneous power failure.

  Further, as described above, the hole 583a is formed facing the left side surface portion 583 of the terminal holder 580, and the hole 584a is formed facing the right side surface portion 584. The external shape of these facing holes 583a and 584a is the gum type battery 601. In addition, the positive electrodes 601a and 602a of the AA battery 602 are formed in such a size that can be inserted. The gum type battery 601 or the AA battery 602 is inserted into the facing holes 583a and 584a, and the negative electrodes 601b and 602b. This is to prevent the negative electrodes 601b and 602b from coming into contact with the gum-type terminal portion 593 or the AA-type terminal portion 592 of the positive terminal plate 590 when they are inserted in the opposite direction. Therefore, even when the gum type battery 601 or the AA size battery 602 is inserted by mistake, there is no possibility of causing a short circuit. Accordingly, in this case, the left side surface portion 583 or the right side surface portion 584 of the terminal holder 580 serves as an insulating portion.

  It should be noted that the specific shapes and structures of the respective parts shown in the above-described best mode are merely examples of implementation in carrying out the present invention, and as a result, the technical scope of the present invention. Should not be interpreted in a limited way.

FIG. 2 to FIG. 62 show the best mode of the present invention, and this figure is a schematic perspective view showing the appearance of an MD reproducing apparatus in a state where an opening for inserting and removing the MD is closed. It is a schematic perspective view which shows the external appearance of MD reproduction apparatus of the state which opened the opening for inserting / removing MD. It is a disassembled side view of MD reproducing | regenerating apparatus. It is a bottom view which shows the state with which the mechanical chassis and the main chassis were combined. It is an expanded sectional view showing a damper member and a support hole in which it is supported. It is a top view of a mechanical chassis. It is a bottom view of a mechanical chassis. It is an expansion perspective view of an auxiliary guide rail. FIG. 10 and FIG. 11 show a method for forming an auxiliary guide rail, and this figure is an enlarged sectional view showing a state in which an L-shaped bent portion is formed. It is an expanded sectional view showing the state where a return piece was formed. It is an expanded sectional view showing the state where a part of L character bending part was pressed and the auxiliary guide rail was formed. FIG. 13 and FIG. 14 show another method of forming the auxiliary guide rail, and this drawing is an enlarged cross-sectional view showing a state in which an L-shaped bent portion is formed. It is an expanded sectional view showing the state where a return piece was formed. It is an expanded sectional view which shows the state by which the bending piece was bent so that it might touch an L-shaped bending part, and the auxiliary guide rail was formed. It is an enlarged bottom view which shows the state by which the feed screw was supported by the mechanical chassis. FIG. 17 and FIG. 18 show a method for forming a bearing portion, and this figure is an enlarged perspective view showing a state in which a slit is formed. It is an expansion perspective view which shows the state in which the U-shaped part was formed. It is an expansion perspective view which shows the state in which the receiving part was formed and the bearing part was formed. FIG. 20 and FIG. 21 show another method of forming the bearing portion, and this drawing is an enlarged perspective view showing a state where a slit is formed. It is an expansion perspective view which shows the state in which the U-shaped part was formed. It is an expansion perspective view which shows the state in which the receiving part was formed and the bearing part was formed. FIG. 23 shows the moving mechanism of the media holder together with FIG. 23, and this figure is a left side view showing a state where the media holder is in the loading position. It is a left view which shows the state which has a media holder in a stand-by position or an unloading position. FIG. 25 shows the operation of the toggle spring together with FIG. 25, and is a right side view showing a state in which the toggle spring acts in a direction in which the mechanical chassis and the media holder are separated from each other. It is a right view which shows the state which the toggle spring is acting in the direction which brings a mechanical chassis and a media holder close. It is a rear view which shows the state which has a media holder in a stand-by position or an unloading position. It is a rear view which shows the state which has a media holder in a loading position. FIG. 29 to FIG. 31 show the operation of the eject lever, and this figure is an enlarged plan view showing a state before the eject lever is rotated. It is an enlarged plan view showing a state where the eject lever is rotated and the right end of the stopper edge has come to a position corresponding to the left end of the stopper piece. FIG. 6 is an enlarged plan view showing a state in which the slider advances and the collar presses the latter half of the pressed piece of the eject lever. It is an enlarged plan view which shows the state which the eject lever rotated further. FIG. 33 and FIG. 34 show the positioning operation of the MD with respect to the mechanical chassis, and this figure is a sectional view showing a state in which the MD is inserted into the media holder. It is sectional drawing which shows a state just before MD is completely inserted in a media holder and a positioning hole is inserted in a guide shaft. It is sectional drawing which shows the state by which MD was positioned with respect to the mechanical chassis. FIG. 36 to FIG. 39 show an example of a guide shaft forming method, and this figure is an enlarged cross-sectional view showing a state before the main surface portion of the mechanical chassis is processed. FIG. 36 is an enlarged cross-sectional view showing a state in which drawing processing has been performed following FIG. 35. FIG. 37 is an enlarged cross-sectional view showing a state in which drawing processing has been performed following FIG. 36. FIG. 38 is an enlarged cross-sectional view showing a state in which drawing processing has been performed following FIG. 37. FIG. 39 is an enlarged cross-sectional view illustrating a state where the drawing process is performed subsequent to FIG. 38 and the guide shaft is formed. It is an enlarged bottom view of a cover body. 42 to 45 show an opening / closing mechanism of the cover body, and this figure is an enlarged side view partially showing a state in which the cover body is locked. FIG. 7 is an enlarged side view showing a part of a cross-section of a state in which the lock slider moves rearward to unlock the cover body and the MD rises and contacts the pressed edge of the cover body. FIG. 5 is an enlarged side view showing a part of a cross section of a state in which the lock slider moves further rearward and the MD further rises to press the pressed edge of the cover body to rotate the cover body. FIG. 6 is an enlarged side view, partly in section, showing a state in which the lock slider is moved further rearward, the pressed surface of the cover body is pressed by the lock piece, and the cover body is further rotated. FIG. 10 is an enlarged side view showing a state in which the lock slider is further moved rearward and the cover body is completely opened in a cross section. 47 to 51 show the operation of each slider when the MD is ejected, and this figure is a side view showing a state where the cover body is locked to the lock slider. It is a side view which shows the state where the lock slider and the slider began to move backward by operation of eject picking. FIG. 10 is a side view showing a state where the lock slider and the slider are further moved rearward and the cover body is turned. It is a side view which shows the state which moved the lock slider and the slider to the moving end of the back side, the cover body was completely open | released, and MD protruded from the apparatus. It is a side view which shows the state which operation of the eject picking was cancelled | released and the lock slider and the relay slider were moved ahead. It is a side view which shows the state by which MD was taken out and the cover body was obstruct | occluded. 53 and 54 show the operation of each slider when the MD is inserted, and this figure is a side view showing a state in which the MD is inserted and the cover body is opened. It is a side view which shows the state which MD inserted and the lock slider moved ahead, and the front-end edge contact | abutted to the temporary stop piece of the main chassis. It is a side view which shows the state by which a cover body is rotated toward a closed position and the lock piece of a lock slider is pressed by the press surface. 56 to 62 show a battery case, and this figure is an enlarged horizontal sectional view showing a state where the battery case is attached to the main chassis. It is an expansion disassembled perspective view which shows a cover part, a fulcrum board, and a part of case main body. It is an expanded rear view which shows the state by which the cover part was open | released. 59 shows the operation of locking the lid portion in the closed position together with FIG. 59, and this figure is an enlarged cross-sectional view showing a state in which the lid body moves to the tip side with respect to the hinge body. It is an expanded sectional view showing the state where the lid body was slid with respect to the hinge body and the lid was locked in the closed position. It is an expansion disassembled perspective view which shows a part of terminal block and a case main body. It is a vertical sectional view showing a state where a gum type battery is housed. It is a vertical sectional view showing a state in which an AA battery is housed.

Explanation of symbols

  12 ... MD (recording medium), 200 ... mechanical chassis, 218 ... guide shaft, 218c ... conical portion

Claims (4)

A mechanical chassis to which a recording medium is mounted,
A mechanical chassis in which a guide shaft having a conical portion with a tilted shaft is integrally formed. The mechanical chassis according to claim 1, wherein the shaft of the conical portion of the guide shaft is inclined toward the insertion end side into which the recording medium is inserted. The mechanical chassis according to claim 1, wherein the guide shaft is integrally formed in the vicinity of the insertion end of the recording medium. The mechanical chassis according to claim 1, comprising a sheet metal material.

Images