JP2008057727A - Driving force transmission device of electronic equipment, electronic equipment and disk reproducing recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving force transmission device of electronic equipment, the electronic equipment and a disk reproducing recorder, without damaging a worm mechanism even in an overload state of a driven body, by making rotation suppressing force different, by making a worm in a transmission mechanism operate the clutch function in response to the rotational direction of a motor, when driving the driven body via the motor. <P>SOLUTION: This driving force transmission device of the electronic equipment drives a driven means 9 via the motor 22 and a worm gear mechanism 21. A first inclined face 23c of the worm 23 and an inclined face formed in a conical part 23g of a worm shaft 23a, and a second inclined face 23e formed in the worm 23 and an inclined face 30a formed in a stopper 30, are opposed in response to the rotational direction of the motor 22. The inclined face of the conical part 23g formed in the worm shaft 23a, is selected in the area smaller than the inclined face 30a formed in the stopper 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic device driving force transmission device, an electronic device, and a disk reproducing / recording device provided with a worm gear mechanism, and more particularly to an electronic device driving force transmission device, an electronic device, and a disk reproducing device that can prevent the worm gear mechanism from being damaged. / Related to recording device.

  2. Description of the Related Art Conventionally, an optical disk reproducing / recording apparatus as an electronic apparatus has a worm gear mechanism using a worm and a worm wheel as a driving force transmission means, and an optical disk is loaded and transported by driving the worm gear mechanism by a motor. ing. In the disk reproducing / recording apparatus disclosed in Patent Document 1, a worm gear attached to a rotating shaft of a motor is used to simplify a mechanism for transmitting power alternatively to a pickup moving mechanism and a disk loading mechanism using a common motor. And a worm wheel that meshes with the worm gear is supported by a movable plate that is movable along the rotation axis of the motor, and is located on the left and right of the worm wheel and can be meshed with the worm wheel alternatively. An optical disk reproducing / recording apparatus is arranged so that the pickup moving mechanism is operated by meshing the first gear and the worm wheel and the disk loading mechanism is operated by meshing the second gear and the worm wheel. It is disclosed.

  Further, in Patent Document 2, in order to reduce the load on the disk transport motor when the disk is inserted and to smoothly transport the disk when the disk is ejected, a second idle gear and a roller gear meshing with the second idle gear are fed to the feed plate. And a mechanism in which a second idle gear is rotatably contacted and separated from below by a first idle gear rotatably supported by a chassis. That is, when the disc is inserted, a downward force (F1) is applied to the second idle gear to weaken the pressing force of the feed roller against the disc, thereby reducing the rotational load on the disc carrying motor at the end of disc conveyance. Also, when the disc is ejected, an upward force (F2) is applied to the second idle gear to increase the pressing force of the feed roller against the disc so that it can be smoothly ejected even if the disc is warped. Technology is disclosed.

  In the worm gear mechanism disclosed in Patent Document 1 and Patent Document 2 described above, the worm is fixed to the motor shaft of the motor by press-fitting or the like, and the rotational force of the worm wheel is transmitted to the optical disk transport mechanism or the lifting mechanism of the reproducing apparatus by a belt or the like. It has a structure. However, in an optical disk reproducing / recording apparatus having a conventional worm gear mechanism, the rotation of the worm wheel may occur when an unexpected load occurs when the rotational force of the worm wheel is transmitted to another transport mechanism or lifting mechanism by the belt. As a result, an excessive load is generated between the worm and the worm wheel, the teeth of the worm wheel are damaged, and the tooth surface of the worm and the tooth surface of the worm wheel are damaged. In addition, if the teeth of the worm wheel are damaged, the rotational force of the motor that rotates the worm cannot be accurately transmitted to the worm wheel, and the driving force is transported to a predetermined position of the transport mechanism and the lifting mechanism of the optical disk playback / recording device. Alternatively, the optical disc cannot be reproduced accurately because it cannot be lifted or lowered. Further, when the tooth surface of the worm or the tooth surface of the worm wheel is damaged, there is a problem that an abnormal noise is generated from the meshed portion of the worm and the worm wheel every time the worm is rotated by the motor.

  In order to solve the above-mentioned problem, in an optical disk reproducing / recording apparatus having a worm gear structure, when an unexpected load is generated in a mechanism for transmitting the rotational force of the worm wheel to the driven means side, the worm and the worm wheel Patent Document 3 and Patent Document 4 disclose a worm gear feed mechanism configured to prevent damage to the worm and the worm wheel by disengaging the gear.

  In the feeding mechanism of Patent Document 3, a base, a guide rail fixed to the base, a driven part that slides on the guide rail, a rack fixed to the driven part, A motor fixed to the base, a bearing having an oval through hole fixed to the base, a worm gear supported at both ends by the through hole, and a helical gear supported by the base and meshed with the worm gear and the rack And a universal joint that connects the rotating shaft of the motor and the rotating shaft of the worm gear, and an elastic member that urges both ends of the worm gear in the helical gear direction, and the elliptical through hole allows the helical gear and the worm gear to be separated from the tooth tip. Due to the feed mechanism having a long length, the motor control is not effective, the worm gear runs into the helical gear and the driven part runs away to the position where it cannot move, and mechanically deadlocks. In order to prevent accidents on purpose made such inoperative state, a feed mechanism to prevent deadlock state overload helical gear for transmitting a worm gear driving force is disclosed.

  Further, Patent Document 4 discloses a worm gear attached to a rotation shaft of a motor, a worm wheel meshed with the worm gear, a pinion gear having the same rotation shaft as the worm wheel, and a rack gear meshing with the pinion gear. And a slider that slides as the pinion gear rotates. In this slider feed mechanism, the shaft support member has elasticity so that the rotation shaft of the worm wheel and the pinion gear bends in the same direction as the slider slide direction. When the structure in which one end of the rotating shaft is supported receives an impact from the outside, the impact applied to the slider provided on the drive target such as an optical pickup is eliminated and an excessive load is applied to the gear portion. A feed mechanism is disclosed which is configured not to be added.

JP 2003-59153 A JP 2005-332461 A JP 2001-167535 A JP 2004-176807 A

  In the feeding mechanisms disclosed in Patent Document 3 and Patent Document 4 described above, the worm wheel has a constant rotational deterrent force regardless of whether the rotation direction of the motor is the forward rotation direction or the reverse rotation direction. And the worm wheel are disengaged.

  In a driving force transmission device of an electronic device or an electronic device and an optical disc reproducing / recording device, etc., when a worm gear mechanism having a turntable or a pickup unit is used to raise or lower the reproducing / recording unit, The rotational force of the motor that is required when the reproducing / recording unit is raised requires a force that is larger by the gravity of the reproducing / recording unit than when the reproducing / recording unit is lowered.

  Therefore, when the worm gear mechanism having the configuration disclosed in Patent Literature 3 and Patent Literature 4 is used to raise and lower the reproducing / recording portion of the optical disc, the rotational force required to raise the reproducing / recording portion in advance. Measure the worm wheel so that the worm and worm wheel are disengaged when a rotational deterrent force that exceeds the rotational force of the motor required to raise the playback / recording unit is generated on the worm wheel. There is a need.

  Therefore, when the motor is rotated in the direction opposite to the direction of rotation when the reproducing / recording unit having the rotating unit is raised by the motor, the reproducing / recording unit is lowered with a rotational force smaller than that of raising. Despite being able to lower the playback / recording section, the worm and worm wheel will not be disengaged unless a rotation deterrent that exceeds the rotational force of the motor required to raise the playback / recording section is generated. When the rotation deterrence force is generated in the process of lowering the playback / recording unit, the rotation of the worm and the worm wheel will not occur unless the rotation deterrence exceeds the rotational force of the motor required to raise the reproduction / recording unit. As a result, an unintended load is generated on the motor to shorten the life of the motor. Moreover, the meshing part of the worm and the worm wheel is damaged, and the tooth surface of the worm and the worm wheel is damaged.

  The present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is to reproduce / record a disk carrier such as an optical disk by using a worm and a worm wheel. The drive / power transmission device of an electronic device or electronic device having a worm gear mechanism for loading and unloading a disk carrier onto a playback / recording unit or the disk playback / recording device lowers the playback / recording unit. In this process, when a load exceeding the force required to lower the playback / recording unit is generated, the teeth of the worm wheel can be damaged and the worm and worm wheel teeth can be prevented from being damaged. It is an object of the present invention to provide a device driving force transmission device or an electronic device and a disc reproducing / recording device.

  According to a first aspect of the present invention, in a driving force transmission device for an electronic device that drives a driven means via a motor and a worm gear mechanism, the driving means is coupled to the motor shaft of the motor and inclined to one of the cylindrical portions formed at an intermediate position. A worm shaft composed of a conical portion provided with a surface, a stopper having an inclined surface in a direction opposite to one inclined surface of the conical portion of the worm shaft, and first and second transparent parts into which the worm shaft and the stopper are inserted. The first through hole is formed with a first inclined surface opposite to the inclined surface of the worm shaft, and the second through hole is formed with an inclined surface of the stopper and a predetermined gap. A worm shaft having a worm tooth portion formed on the surface, and a worm shaft inclined surface and a worm according to the rotational direction of the motor. The first inclined surface and the inclined surface of the stopper and the second of the worm Inclined surface formed on the worm shaft with the inclined surface forms as contact pair is obtained by a driving force transmission device of an electronic device, characterized in that selected smaller area than the inclined surface formed on the stopper.

  According to a second aspect of the present invention, in an electronic device that drives a driven means via a motor and a worm gear mechanism, a cone that is coupled to the motor shaft of the motor and has an inclined surface on one of the cylindrical portions formed at an intermediate position. A worm shaft comprising a portion, a stopper having an inclined surface opposite to one inclined surface of the conical portion of the worm shaft, and the first and second through holes into which the worm shaft and the stopper are inserted as a central shaft portion The first through-hole is provided with a first inclined surface facing the inclined surface of the worm shaft, and the second through-hole is provided with a biasing means so that a predetermined gap is formed with the inclined surface of the stopper. And a worm having a worm tooth portion on the surface, and depending on the rotation direction of the motor, the worm shaft inclined surface and the worm first inclined surface, The inclined surface of the stopper comes into contact with the second inclined surface of the worm. Inclined surface formed on the worm shaft with form as is obtained by an electronic device, characterized in that the selected small area compared to the inclined surface formed on the stopper.

  According to a third aspect of the present invention, there is provided a disk reproducing / recording apparatus having a reproducing / recording unit for reproducing / recording a disk carrier using a motor and a worm gear mechanism. A worm shaft having a conical portion having an inclined surface on the surface of the cylindrical portion, a stopper having an inclined surface fitted on the tip of the worm shaft and formed on the surface of the cylindrical portion, and the worm shaft and the stopper are inserted. The first through hole has a first inclined surface that contacts the inclined surface of the conical portion on the inner wall of the first through hole, and the stopper has an inclined surface on the inner wall of the second through hole. A worm having a second inclined surface abutting on the surface, and biasing means for pressing the cylindrical portion of the worm shaft into the first through-hole of the worm, and the inclination of the worm shaft according to the rotation direction of the motor 1st slope of surface and worm Further, the inclined surface of the stopper and the second inclined surface of the worm are in contact with each other, and the inclined surface formed on the worm shaft is selected to have a smaller area than the inclined surface formed on the stopper. It is a device.

  According to the present invention, a driving force transmission device or an electronic device for an electronic device having a worm gear mechanism for raising or lowering a reproducing / recording unit for reproducing / recording a disk carrier, and an electronic device and a disk reproducing / recording device. In the process of lowering the worm wheel, the teeth of the worm wheel may be damaged even when a load exceeding the required force is generated when the playback / recording part is lowered or when loading or loading the disk carrier into the electronic device. The driving force transmission device of the worm gear mechanism that does not damage the tooth surface of the worm or the tooth surface of the worm wheel can be provided.

  Hereinafter, the driving force transmission device or the electronic device and the disc reproducing / recording device of the electronic apparatus according to the present invention reproduce and / or record an optical disc carrier made of an optical disc such as a CD (Compact Disc) or a DVD (Digital Versatile Disc). An example of a configuration applied to a disk reproducing / recording apparatus (hereinafter referred to as an optical disk reproducing apparatus) will be described with reference to FIGS.

  FIG. 1 is a plan view showing an embodiment of an optical disk reproducing apparatus of the present invention, and FIGS. 2A and 2B are counterclockwise directions of a worm gear mechanism as a transmission mechanism used in an embodiment of the optical disk reproducing apparatus of the present invention. FIG. 3 is a plan view of a worm gear mechanism used in one embodiment of the optical disk playback apparatus of the present invention, and FIGS. 4A to 4F are optical disk playbacks of the present invention. FIG. 5 is an operation explanatory diagram for explaining the operation process of the reproducing unit and the sliding unit during loading of the optical disk used in one embodiment of the apparatus, and FIG. 5 shows the configuration of the worm unit used in one embodiment of the optical disk reproducing apparatus of the present invention. 6 is an exploded view with a part shown in cross section, FIG. 6 is a side view with a part of a worm mechanism composed of a worm and a worm wheel used in one embodiment of the optical disk reproducing apparatus of the present invention, and FIG. FIG. 8 is a side sectional view with a section taken along a section showing a state in which a worm and a worm wheel are rotated counterclockwise when viewed in the direction of the paper, and is used in one form of the optical disk reproducing apparatus of FIG. It is a sectional side view which makes 1 section a section which shows the state used for one form of an apparatus and rotating the worm and the worm wheel clockwise as seen in the paper surface direction.

  FIG. 1 is a plan view showing a state in which a loader 5 is taken forward from the opening 2a of the housing 2 of the optical disk reproducing apparatus 1 as a whole, and the loader 5 is a front surface of the housing 2 formed in a substantially box shape. It can be slidably inserted into and removed from a substantially rectangular opening 2a formed in the lower part of FIG. The loader 5 has a concave portion 3a capable of mounting and holding an optical disk (not shown in FIG. 1) 28 described later, a carrier mounting portion 3 including a through hole 3b formed at the center of the concave portion 3a, and a substantially rectangular shape. It is comprised from the rack gear 4a arrange | positioned under the left-right side surface of the loader base 4c, and the guide rod 4b. A rack gear 4 a formed on the left side surface of the loader 5 is engaged with a pinion 7 fitted to a rotation shaft 6 a of a loader driving motor 6 fixed to the housing 2, and is a guide portion 8 </ b> L standing upright in the housing 2. , 8R, the rack gear 4a and the guide bar 4b of the loader 5 are slidably guided.

  In the loader 5, when the loader driving motor 6 is rotationally controlled by a motor drive control unit (not shown), the pinion 7 meshes with the rack gear 4 a, and the rack gear 4 a and the guide rod 4 b of the loader 5 slide on the guide units 8 L and 8 R. It is guided so as to be slidable and slides in the front-rear direction indicated by the arrow AB direction.

  An optical disc reproducing unit or / and a recording unit (hereinafter referred to as a reproducing unit) 9 for reproducing or / and recording the optical disc 28 placed on the carrier placing unit 3 of the loader 5 is arranged at a substantially central position in the housing 2. It is installed. Inside the rectangular sub-base 14 constituting the reproducing section 9, there are a turntable 10 and an optical pickup 11 for rotationally driving the optical disc, and the optical pickup 11 is slid in the direction of arrow CD along the pickup movement axis. A pickup drive unit 12 is provided, and two pins 13 projecting forward are erected on the front surface of the sub-base 14. The pin 13 slides freely on a holding rail (not shown) in the left-right direction indicated by an arrow EF.

  A shaft 15 is bridged between the left and right bearings 16 whose lower surfaces are fixed to the housing 2, and the rear portion of the sub-base 14 constituting the reproducing unit 9 is supported by the shaft 15. On the left and right sides of the front portion of the sub-base 14 of the reproducing unit 9, a holding unit 27 made up of a rectangular block whose bottom surface is fixed to the housing 2 is erected. 14 is restricted from moving in the direction indicated by arrow E-F.

  The slide portion 17 includes a tooth portion 17a such as a rack gear in the front, a pinion 18 that meshes with the tooth portion 17a of the rack gear, and a pulley 19 and a belt 20 that are fixed to a pinion shaft 18a to which the pinion 18 is fixed. Then, the slide portion 17 is slid in the direction of arrow EF by the worm gear mechanism 21 used in the present invention. The worm gear mechanism 21 includes a motor 22, a worm 23, a worm wheel 24, a pulley 25, and a belt 20, as shown in FIGS. 2A and 2B, and FIG. 3. The belt 20 is interposed between the pulley 19 and the pulley 25. It is being handed over.

  Hereinafter, the worm gear mechanism 21 of the optical disk reproducing apparatus 1 used in the present invention described above will be described with reference to FIGS. 2A, the motor shaft 22a of the motor 22 is rotated clockwise (CW), the worm wheel 24 is rotated counterclockwise (CCW) with respect to the worm wheel shaft 24a, and is fitted to the worm wheel shaft 24a. The slide portion 17 is slid in the EF direction via the belt 20 that is stretched over the pulley 25. FIG. 2B shows the worm wheel 24 by rotating the motor shaft 22a of the motor 22 in the CCW direction. Is a perspective view in which the slide portion 17 is slid in the EF direction via the belt 20 that is stretched over the pulley 25 fitted to the worm wheel shaft 24a by rotating the worm wheel shaft 24a in the CW direction. is there.

  Details of the worm gear mechanism 21 will be described with reference to a plan view shown in FIG. In the worm gear mechanism 21 of this example, the worm shaft 23 a of the worm 23 is fitted to the coupling 26 fitted to the motor shaft 22 a of the motor 22 fixed to the base of the housing 2. The teeth of the worm wheel 24 fitted to the worm wheel shaft 24a erected on the base of the housing 2 so as to be orthogonal to the worm shaft 23a are meshed with the worm 23 and fitted to the worm wheel shaft 24a. The slide portion 17 is slid through the belt 20 that is stretched around the pulley 25.

  In the worm gear mechanism 21, the worm 23 is rotated via the coupling 26 and the worm shaft 23a by rotating the motor shaft 22a in the CW or CCW direction via a motor drive control unit (not shown). Thus, the worm wheel 24 meshed with the worm 23 rotates in the CW or CCW direction. The belt 20 transmits the rotational force of the worm hole 24 to the pulley 19. The pulley 19 has a sliding portion 17 that is moved by an arrow E-F by a tooth portion 17a of the sliding portion 17 formed of a rack gear meshed with a pinion shaft 18a that is rotatably installed on a base of the housing 2. Slide in the direction. By this operation, the slide portion 17 slides in the left-right direction with respect to the paper surface of FIG. 1 as the motor 22 rotates in the CW or CCW direction.

  4A to 4F, the playback unit 9 and the slide unit 17 are raised / lowered when the loader 5 on which the optical disc 28 is loaded is loaded into the housing 2 of the optical disc playback apparatus 1. The process of operation will be described. 4 (A) and 4 (B) are a front view and a side view of the main part showing a state immediately after the optical disk 28 placed on the loader 5 is loaded into the housing 2, and FIG. 4 (C). 4D is a front view of a main part showing a state in which the reproducing unit 9 is lifted by sliding the slide unit 17 to the left of the arrow E from the state of FIGS. 4A and 4B. 4 (E) and 4 (F), the slide unit 17 further slides in the left direction of the arrow E from the state of FIG. 4 (C) and FIG. It is the front view and side view of the principal part which show the state which rose to the horizontal state and the clamper 29 inserted the optical disk 28.

  4 (A) to 4 (F), the slide portion 17 is constituted by an L member having a substantially L-shaped cross section, and a tooth portion 17a such as a rack gear is provided at the tip of the horizontal portion constituting the L member. The two inclined holes 17b that are formed as two cam grooves penetrating the front and back (front and back) of the vertical portion constituting the L member are formed. Two pins 13 erected on the front surface of the sub-base 14 on which the reproducing unit 9 is placed are penetrated into the two inclined holes 17b, and the tooth portion 17a of the slide portion 17 is shown in FIG. 4B. In this manner, the pinion 18 that is rotatably fitted to the pinion shaft 18a erected on the base of the housing 2 meshes with the pinion 18 and the rotational force from the belt 20 and the pulley 19 is applied to the tooth of the slide portion 17 via the pinion 18. 17a.

  As described in detail in FIG. 1, the front left and right side surfaces of the sub-base 14 on which the reproducing unit 9 is placed are held by the blocks of the holding unit 27 as shown in FIG. 4A, and the rear part is shown in FIG. As shown in FIG. 2B, the shaft 15 is bridged between two bearings 16 having a block structure so as to be swingable. As described above, the turntable 10 and the optical pickup 11 are disposed in the reproducing unit 9 on the sub-base 14, and the optical disk 28 having a center hole 28 a is placed in the recess 3 a of the loader base 4 c of the loader 5. The clamper 29 holds the tip of the turntable 10 that is inserted into the center hole 28a of the optical disk 28 as a carrier via a control unit (not shown).

  4A and 4B having the above-described configuration, the pin 13 is inserted into the lowermost position of the inclined hole 17b of the slide portion 17 when the loader 5 is loaded in the housing 2. . The sub-base 14 on which the reproducing unit 9 driven by the worm gear mechanism 21 is mounted rotates in the CW direction of FIG. As shown in FIGS. 4 (C) and 4 (D), the optical disk 28 placed on the loader 5 loaded in the B direction was raised at the bottom of the inclined hole 17b as shown in FIGS. The pin 13 moves to the upper right along the inner wall of the inclined hole 17b to a substantially middle position, and the tip of the turntable 10 on the reproducing unit 9 slides by moving upward to a position facing the center hole 28a of the optical disk 28. The part 17 moves in the left direction indicated by the arrow E.

  Further, the worm gear mechanism 21 operates, the regenerating unit 9 rises in the CW direction around the shaft 16, and the pin 13 moves to the uppermost position of the inclined hole 17b, as shown in FIGS. 4 (E) and 4 (F). When the tip of the turntable 10 is completely inserted into the center hole 28a of the optical disk 28 placed in the recess 3a of the loader 5, the control unit (not shown) lowers the clamper 29 so that the optical disk 28 is placed on the turntable 10. To hold it rotatable. The pickup drive unit 12 (see FIG. 1) moves the optical pickup 11 in the radial direction of the optical disk 28, and reproduces or records various data such as audio data, video data, and character data recorded on the optical disk 28.

  One embodiment of the above-described embodiment of the worm gear mechanism 21 will be described with reference to FIGS. FIG. 5 is an exploded plan view of the worm gear mechanism 21 having a cross section of one part, and FIG. 6 is an assembly plan view of the worm gear mechanism 21 having a cross section of one part. Is composed of a stopper 30, a worm 23, a worm shaft 23a, a spring 31, a cap 32, a coupling 26, a motor 22, a worm wheel 24, and the like.

  The worm 23 is formed in a substantially cylindrical shape, and on the central axis, a first through hole 23d, a bearing portion 23b, and a stopper 30 that can be rotatably fitted to the outer diameter of the cylindrical portion 23h formed in the worm shaft 23a. Of the first through hole 23d formed in the rear portion of the bearing portion 23b is formed, and a divergent first inclined surface 23c is formed to communicate with the maximum inner diameter of the first through hole 23d. A divergent second inclined surface 23e communicating with the maximum inner diameter of the second through hole 23f is also formed on the front side. The outer diameter of the stopper 30 and the inclined surface 30a formed on the outer shape of the stopper 30 are fitted into the second inclined surface 23e and the second through hole 23f in front of the bearing portion 23b. Forms the worm tooth portion 23k.

  The stopper 30 is formed in a substantially cylindrical shape, and the outer diameter thereof is selected so as to be fitted in the second through hole 23f of the worm 23, and an inclined surface 30a having a taper with the outer diameter as a maximum value is formed. Thus, the worm 23 is fitted so as to be in contact with the second inclined surface 23e formed in the worm 23. A counterbore 30b into which one end shaft of the worm shaft 23a can be inserted is formed in the central axis of the stopper 30.

  A pressing projection comprising a truncated cone-shaped conical portion 23g facing the first inclined surface 23c of the worm 23 and a columnar portion 23h fitted to the first through hole 23d is located at the intermediate portion near the left end of the worm shaft 23a. 33 is formed, and a concave groove 23j is formed on the inclined surface of the conical portion 23g of the pressing projection 33 as shown in the enlarged view of the A portion of FIG. 5, so that the contact area with the first inclined surface 23c of the worm 23 is formed. Is reduced. The concave groove 23j may be a convex portion, and the first and second inclined surfaces 23c and 23e of the worm 23 are provided with irregularities to change the number of irregularities, or the surface is roughened or made finer. It is also possible to adjust the facing area between the inclined surfaces by changing the contact area and changing the inclination angle.

  The spring 31 is inserted into the worm shaft 23a on the right side of the pressing projection 33, and a coil spring having an outer diameter smaller than the inner diameter of the first through hole 23d of the worm 23 is selected. The cap 32 is fitted to the right end portion of the first through hole 23a of the worm 23, and a central through hole into which the worm shaft 23a can be inserted is formed in the central axis of the cap 32 to rotate the worm shaft 23a together with the bearing portion 23b. Possible to pivot in the through hole of the worm 23. The coupling 26 is formed in a substantially cylindrical shape, and the worm shaft 23 a and the motor shaft 22 a of the motor 22 are fitted into the inner diameter.

  The assembly state of the worm gear mechanism 21 will be described with reference to FIG. First, the worm shaft 23a is inserted into the first and second through holes 23d and 23f of the worm 23, and the stopper 30 is inserted into the second through hole 23f. The left end surface of the worm shaft 23a is inserted into the counterbore 30b of the stopper 30 and fixed to the worm shaft 23a with an adhesive or the like. Next, the spring 31 is inserted into the outer diameter of the worm shaft 23 a extending to the right side of the pressing protrusion 33, and the outer diameter of the spring 31 is inserted into the inner diameter of the first through hole 23 d of the worm 23. Further, the inner diameter of the cap 32 is inserted into the worm shaft 23a, the outer diameter of the cap 32 is inserted into the first through hole 23d of the worm 23 while pressing the spring 31, and the first through hole 23d is bonded with an adhesive or the like. Secure to the right edge.

  Accordingly, since the cap 32 is fixed in the first through hole 23d, the spring 31 presses the pressing protrusion 33 of the worm shaft 23a in the direction of the first inclined surface 23 of the worm 23, whereby the conical portion of the pressing protrusion 33 is obtained. The inclined surface of 23 g and the first inclined surface 23 c of the worm 23 abut. Further, at this time, a slight gap g is formed between the inclined surface 30 a of the stopper 30 and the second inclined portion 23 e of the worm 23, and the worm shaft 23 a and the motor shaft of the motor 22 are within the inner diameter of the coupling 26. The worm 23 is coupled to the motor 22 by fitting 22a.

  The operation of the worm gear mechanism 21 will be described with reference to FIGS. Hereinafter, in FIG. 7 and FIG. 8, the same reference numerals are given to portions corresponding to FIG. 5 and FIG. FIG. 7 shows the worm wheel 24 rotated in the CCW direction with respect to the rotation of the motor 22 by the worm gear mechanism 21 of the present invention, and FIG. 8 shows the worm wheel 24 rotated in the CW direction. In the case of FIG. 7, as shown in FIG. 2A, when the motor shaft 22a is rotated in the CCW direction as viewed from the motor shaft 22a side of the motor 22, the worm wheel 24 is rotated in the CCW direction. As described with reference to FIG. 4F, the left end of the sub-base 14 of the reproducing unit 9 rises around the shaft 15. Further, as shown in FIG. 8, when the motor shaft 22a is rotated in the CW direction when viewed from the motor shaft 22a side of the motor 22, the worm hole 24 is rotated in the CW direction, and FIGS. ), The left end portion of the sub-base 14 of the reproducing unit 9 is configured to descend about the shaft 15.

  In the case of the worm gear mechanism 21 shown in FIG. 7, when the motor shaft 22a rotates in the CCW direction, the worm 23 is caused to rotate in the arrow X direction as shown in the B part enlarged view by the force to rotate the worm wheel 24 in the CCW direction. Force to move is generated. Accordingly, the gap g formed between the second inclined surface 23e of the worm 23 and the inclined surface 30a of the stopper 30 is joined to each other, and the second inclined surface 23e of the worm 23 and the inclined surface 30a of the stopper 30 are joined. A frictional force is generated between them, and the rotational force of the worm shaft 23 a is transmitted to the worm 23 via the stopper 30. As a result, when the worm shaft 23a rotates in the CCW direction, the worm 23 also rotates in the same manner, and the worm wheel 24 also rotates in the CCW direction to raise the reproducing unit 9.

  At this time, for example, if a burr or the like is generated on the inner wall of the inclined hole 17b described with reference to FIGS. 4A to 4F, the burr is caught by the pin 13 and the slide portion 17 is moved in the EF direction. Can not slide smoothly. In this way, when the rotation of the worm wheel 24 is suppressed by overload, the inclined surface 30a of the stopper 30 slides on the second inclined portion 23e of the worm 23 (hereinafter referred to as a clutch function), whereby the rotation of the motor 22 is performed. The force is not transmitted to the worm 23. As a result, an extreme load is generated in the meshing between the worm 23 and the worm wheel 24, the teeth of the worm wheel 24 are missing, and the tooth surfaces of the worm 23 and the worm wheel 24 are damaged. It becomes possible to prevent.

  In the case of FIG. 8, when the motor shaft 22a of the motor 22 rotates in the CW direction, the worm 23 will move in the arrow Y direction as shown in the enlarged view of the C portion by the force to rotate the worm wheel 24 in the CW direction. Force is generated. By this force, the first inclined surface 23c of the worm 23 presses the inclined surface of the conical portion 23g of the worm shaft 23a. At this time, a frictional force is generated between the first inclined surface 23c and the inclined surface of the conical portion 23g by the force with which the first inclined surface 23c of the worm 23 presses the inclined surface of the conical portion 23g of the worm shaft 23a. The rotational force of the worm shaft 23 a is transmitted to the worm 23. As a result, when the motor shaft 22a rotates in the CW direction, the worm 23 also rotates in the same direction, and the worm wheel 24 rotates in the CW direction to lower the reproducing unit 9.

  At this time, for example, if a burr or the like is generated on the inner wall of the inclined hole 17b described with reference to FIGS. 4 (A) to 4 (F), the burr is caught by the pin 13 and the slide portion 17 cannot be smoothly slid. When the rotation of the worm wheel 24 is inhibited, a clutch function that causes the inclined surface of the conical portion 23g of the worm shaft 23a to slip with respect to the first inclined surface 23c of the worm 23 acts, thereby causing the rotational force of the motor 22 to rotate. Is not transmitted to the worm 23. This causes an extreme load on the meshing between the worm 23 and the worm wheel 24, and even when the rotation of the worm wheel 24 is suppressed, the teeth of the worm wheel 24 are damaged, and the worm 23 In addition, the tooth surface of the worm wheel 24 can be prevented from being damaged.

  Since the concave surface 23j is formed on the inclined surface of the conical portion 23g of the worm shaft 23a as shown in the enlarged view of the C portion of FIG. 8, the first inclined surface 23c of the worm 23 is the cone of the worm shaft 23a. The ground contact area that contacts when the inclined surface of the portion 23g is pressed is smaller than the ground contact area between the second inclined surface 23e of the worm 23 and the inclined surface 30a of the stopper 30 as shown in FIG. For this reason, the frictional force by which the first inclined surface 23c presses the inclined surface of the conical portion 23g of the worm shaft 23a causes the second inclined surface 23e of the worm 23 and the inclined surface 30a of the stopper 30 as shown in FIG. It becomes smaller than the friction force between.

  Therefore, as shown in FIG. 8, when a large load is applied to the worm wheel 24 while the worm wheel 24 is being rotated in the CW direction in order to lower the reproducing unit 9, As shown in FIG. 7, the rotation restraining force on the worm wheel 24 when the inclined surface 23 c starts to slide on the inclined surface of the conical portion 23 of the worm shaft 23 a and the clutch function operates tries to raise the reproducing unit 9. Due to a clutch function that causes the inclined surface 30a of the stopper 30 to come into contact with the second inclined surface 23e of the worm 23 when a large load is applied during the rotation of the worm wheel 24 in the CCW direction to cause slippage. It becomes smaller than the rotation inhibition force of the worm wheel 24.

  For this reason, according to the optical disk reproducing apparatus of the present invention, the worm wheel 24 is rotated on the first inclined surface 23c of the worm 23 while the worm wheel 24 is being rotated in the CW direction as shown in FIG. When the inclined surface of the conical portion 23g of the worm shaft 23a comes into contact with each other and starts to slip to produce a clutch function, the rotation deterring force of the worm wheel 24 causes the regeneration portion 9 to rise, as shown in FIG. The rotation of the worm wheel 24 is less than the rotation deterring force when the inclined surface 30a of the stopper 30 comes into contact with the second inclined surface 23e of the worm 24 while the worm wheel 24 is rotating in the CCW direction, and starts to slip and causes a clutch function. I can do it.

  As described above, according to the driving force transmission device, electronic device, and disk reproducing / recording device of the electronic device of the present invention, when the reproducing unit 9 is moved up and down by rotating the motor 22, the pulleys 19 and 25 and the belt Even if an unscheduled load is generated on the worm wheel 24 and rotation of the worm wheel 24 is suppressed, the worm shaft 23 a is inclined between the inclined surface of the conical portion 23 g and the first inclined surface 23 c of the worm 23 and between the inclined surface 30 a of the stopper 30 and the worm 23. Since the clutch function can be operated between the second inclined surfaces 23e, a large load is generated in the meshing between the worm 23 and the worm wheel 24, and the tooth portion of the worm wheel 24 is damaged. It becomes possible to prevent the tooth surface of the wheel 24 from being damaged.

  Further, according to the driving force transmission device, the electronic device, and the disc reproducing / recording device of the present invention, when the reproducing unit 9 is lowered, the inclined surface of the conical portion 23g of the worm shaft 23a and the first worm 23 are arranged. The rotation suppression force generated by the clutch function between the inclined surfaces 23c is compared with the rotation suppression force generated by the clutch function between the inclined surface 30a of the stopper 30 and the second inclined surface 23e of the worm 24 when the regeneration unit 9 is raised. Since the conical portion 23g is provided with the concave groove 23j or the convex groove to reduce the contact area, the sub-base 14 having the reproducing unit 8 can be lowered with a smaller rotational force than the reproducing unit 9 is raised. I can do it.

  Further, conventionally, when the regeneration unit 9 is lowered, the clutch function does not operate unless the rotation deterrence exceeding the rotational force of the motor 22a required to raise the regeneration unit 9 is activated. Even if an unexpected load is generated in the process, the meshing between the worm 23 and the worm wheel 24 will cause a load unless the rotation deterring force that exceeds the rotational force of the motor 22 required to raise the regeneration unit 9 is reached. In this state, the life of the motor 22 is shortened and the tooth surfaces of the worm 23 and the worm wheel 24 are damaged. However, according to the present invention, these problems can be prevented.

  In addition, according to the driving force transmission device, the electronic device, and the disk reproducing / recording device of the present invention, two friction members having different contact areas forming a clutch function are formed between the inside of the worm 23 and the worm shaft 23a. Therefore, when the rotation of the worm wheel 24 is suppressed, a mechanism for preventing breakage of the teeth of the worm wheel 24 can be realized in a very simple and small space. Thus, even if there is no extra space around the worm 23 and the worm wheel 24, it is possible to prevent the teeth of the worm wheel 24 from being damaged and scratching the tooth surfaces of the worm 23 and the worm wheel 24. .

  Furthermore, according to the driving force transmission device, electronic device, and disk reproducing / recording device of the electronic device of the present invention, the inclined surface of the conical portion 23g and the inclined surface 30a of the stopper 30 formed on the cylindrical portion 23h of the worm shaft 23a As shown in FIG. 8, the worm when the motor shaft 22a is rotated in the CW direction by changing the surface roughness of these parts, the angle of the inclined surface, and the like. Rotation inhibiting force necessary for the first inclined surface 23c of 23 to begin to slide on the inclined surface of the conical portion 23 of the worm shaft 23a, and when the motor shaft 22a is rotated in the CCW direction as shown in FIG. Since the rotation inhibiting force required for the second inclined surface 23e of the worm 23 to start to slide on the inclined surface of the inclined surface 30a of the stopper 30 can be individually changed, the motor shaft 22a can be changed to CW. If that is rotated in direction and CCW direction, by changing the clutch function generated according to each need, it produces effects that can alter the rotation inhibiting force of the worm wheel 24. The unevenness, roughness, and inclination angle of the surfaces of the first and second inclined surfaces 23c and 23e of the worm 23 and the inclined surface 30a of the stopper 30 may be changed.

  In the above-described embodiment, the driving force transmission device that moves the reproducing unit 9 of the optical disk reproducing device 1 up and down has been described. However, the present invention is not limited to this configuration, and the disk carrier is loaded or loaded in the housing. The present invention can be applied to various mechanisms and the like of a driving force transmission device that moves down and an optical pickup that moves the optical pickup up and down to a predetermined track position of the optical disk carrier.

  In the above-described embodiment, the disk reproducing / recording device has been described as the driving force transmission device and the electronic device of the electronic device. However, as the electronic device applicable to the present invention, a disk such as a CD, MD, VD, DVD, HDD, etc. The present invention can be applied to a carrier and tape cassette, a reproducing or / and recording device for magnetic tape media such as a VTR, a TV receiver with a reproducing / recording function, a computer, and a driving force transmission device for controlling various electronic devices.

It is a top view which shows one form of the optical disk reproducing | regenerating apparatus of this invention. It is a perspective view when rotating the worm gear mechanism as a transmission mechanism used for one example of the optical disk reproducing device of the present invention counterclockwise and clockwise. It is a top view of the worm gear mechanism used for one example of an optical disk reproducing device of the present invention. It is operation | movement explanatory drawing for demonstrating the operation | movement process of the reproducing | regenerating part and slide part at the time of loading of the optical disk used for 1 form of the optical disk reproducing | regenerating apparatus of this invention. FIG. 3 is an exploded view, partly in section, showing the configuration of a worm portion used in one embodiment of the optical disk reproducing apparatus of the present invention. It is a side view which makes a cross section a part of worm mechanism which consists of a worm and a worm wheel used for one form of an optical disk reproducing device of the present invention. FIG. 3 is a side sectional view showing a state where a worm and a worm wheel used in one embodiment of the optical disk reproducing apparatus of the present invention are rotated counterclockwise as viewed from the motor side. FIG. 3 is a side sectional view showing a state in which a worm and a worm wheel used in one embodiment of the optical disk reproducing apparatus of the present invention are rotated clockwise as viewed from the motor side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disc reproducing apparatus, 2 ... Housing, 2a ... Opening, 3a ... Recess, 3b, 23d, 23f ... Through hole, 4a ... Rack gear 4b ... guide rod, 4c ... loader base, 5 ... loader, 6 ... loader drive motor, 7, 18 ... pinion, 8L, 8R ... Guide unit, 9 ... Playback unit, 10 ... Turntable, 11 ... Optical pickup, 12 ... Pickup drive unit, 13 ... Pin, 14 ... Subbase , 15 ... shaft, 16 ... bearing, 17 ... slide part, 17a ... tooth part, 17b ... inclined hole, 18a ... tooth part, 19, 25 ..... Pulley, 20 ... Belt, 21 ... Worm mechanism, 22 ... Motor, 22a ... Motor , 23... Worm, 23 a... Worm shaft, 23 b... Bearing portion, 23 c... First inclined surface, 23 e. .... Conical part, 23h ... Cylinder part, 23j ... Recessed groove, 24 ... Worm wheel, 24a ... Worm wheel shaft, 26 ... Coupling, 27 ... · Holding portion, 28 ··· optical disc, 28a ··· center hole, 29 ··· clamper, 30 ··· stopper, 30a ··· inclined surface, 30b ··· counterbored hole, 31... Spring, 32... Cap, 33.

Claims (6)

In a driving force transmission device of an electronic device that drives a driven means via a motor and a worm gear mechanism,
A worm shaft composed of a conical portion coupled to a motor shaft of the motor and provided with an inclined surface on one of the cylindrical portions formed at an intermediate position;
A stopper formed with an inclined surface in a direction opposite to the inclined surface of the conical portion of the worm shaft;
The central shaft portion has first and second through holes into which the worm shaft and the stopper are inserted, and the first through surface is opposed to the inclined surface of the worm shaft. The second through-hole is formed with a second inclined surface opposed to the inclined surface of the stopper through a biasing means so that a predetermined gap is formed, and a worm tooth portion is provided on the surface. With a worm,
According to the rotation direction of the motor, the inclined surface of the worm shaft, the first inclined surface of the worm, the inclined surface of the stopper, and the second inclined surface of the worm are in contact with each other. A driving force transmission device for an electronic device, wherein the inclined surface formed on the worm shaft is selected to have a smaller area than the inclined surface formed on the stopper.   A concave or / and convex portion is formed on the surface of the inclined surface of the conical portion of the worm shaft arranged to face the first inclined surface, and a contact area with the surface of the first inclined surface is reduced. The driving force transmission device for an electronic device according to claim 1. By changing the roughness of the inclined surface of the conical portion formed on the worm shaft and the surface of the inclined surface of the stopper,
A rotation deterring force necessary for the first inclined surface of the worm to start sliding on the inclined surface of the conical portion of the worm shaft when the motor shaft is rotated in one direction; The rotation inhibitory force required for the second inclined surface of the worm to start sliding on the inclined surface of the stopper when rotated in the direction opposite to the one direction is individually changed. The driving force transmission device for an electronic device according to claim 1. By changing the angle of the inclined surface of the conical portion formed on the worm shaft and the inclined surface of the stopper,
A rotation deterring force necessary for the first inclined surface of the worm to start sliding on the inclined surface of the conical portion of the worm shaft when the motor shaft is rotated in one direction; The rotation inhibitory force required for the second inclined surface of the worm to start sliding on the inclined surface of the stopper when rotated in the direction opposite to the one direction is individually changed. The driving force transmission device for an electronic device according to claim 1. In an electronic device that drives a driven means via a motor and a worm gear mechanism,
A worm shaft composed of a conical portion coupled to a motor shaft of the motor and provided with an inclined surface on one of the cylindrical portions formed at an intermediate position;
A stopper formed with an inclined surface in a direction opposite to the inclined surface of the conical portion of the worm shaft;
The central shaft portion has first and second through holes into which the worm shaft and the stopper are inserted, and the first through surface is opposed to the inclined surface of the worm shaft. The second through-hole is formed with a second inclined surface opposed to the inclined surface of the stopper via a biasing means so that a predetermined gap is formed, and a worm tooth portion is provided on the surface. And
According to the rotation direction of the motor, the inclined surface of the worm shaft, the first inclined surface of the worm, the inclined surface of the stopper, and the second inclined surface of the worm are in contact with each other. An electronic apparatus, wherein the inclined surface formed on the worm shaft is selected to have a smaller area than the inclined surface formed on the stopper. In a disk reproducing / recording apparatus having a reproducing / recording unit for reproducing / recording a disk carrier using a motor and a worm gear mechanism,
A worm shaft that is fitted to the motor shaft of the motor by a coupling and that forms a conical portion having an inclined surface on the surface of the cylindrical portion at an intermediate position;
A stopper that is fitted to the tip of the worm shaft and that forms an inclined surface on the surface of the cylindrical portion;
The first and second through holes for inserting the worm shaft and the stopper are formed, and a first inclined surface that abuts the inclined surface of the conical portion is formed on the inner wall of the first through hole, On the inner wall of the second through hole, a worm having a second inclined surface that contacts the inclined surface of the stopper;
Biasing means for pressing the cylindrical portion of the worm shaft into the first through hole of the worm;
The inclined surface of the worm shaft, the first inclined surface of the worm, the inclined surface of the stopper of the worm, and the second inclined surface are in contact with each other according to the rotation direction of the motor. A disc reproducing / recording apparatus, wherein the inclined surface formed on the worm shaft is selected to have a smaller area than the inclined surface formed on the stopper.

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