JP2006004540A - Optical disk device and method for manufacturing optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device which makes the reconciliation of the assurance of mechanical strength and weight reduction possible even with a device using a lightweight material for a rail material and a method for manufacturing the optical disk device. <P>SOLUTION: The optical disk device has a casing, a tray attached to the casing freely movably into and out of the casing, and a holding section for freely movably holding the casing and the tray. The holding section has a first rail mount disposed at the casing, a second rail mount disposed at the tray, and a rail slidably disposed at the first and second rail mount. The rail has at least either of a curved surface section 14 or plane section for connecting at least two faces 16 and 17 among a plurality of the faces constituting the inside surface of a bending section 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus that performs at least one of recording and reproduction of information on an optical disc by an optical pickup.

  As optical disc apparatuses, CD-ROM / R / RW, DVD-ROM / RAM / R / RW, etc. have already been put into practical use, and application to various areas and development for high performance are being actively carried out. Particularly recently, along with the rapid market expansion of personal computers, the penetration rate of built-in optical disk devices in personal computers has increased. As a method for mounting an optical disk mounted on an electronic device, a method of pulling out a tray from a housing, attaching a disk to the tray, and mounting it again in the housing (hereinafter referred to as a tray method) is common. Hereinafter, the configuration of a conventional tray type optical disc apparatus will be described with reference to FIGS.

  FIG. 5 is an external view of a conventional optical disc apparatus. In FIG. 5, 1 is an optical disk device, 2 is a housing, 2a is an upper housing portion, 2b is a lower housing portion, 3 is a tray, 4 is an optical pickup module, 5 is a rail, 6a is a housing-side rail holding portion, 6b is a tray side rail holding portion, 7 is a spindle motor, 7a is a disk mounting portion, 8 is a metal cover, 8a is an opening, 9 is a carriage, 10 is a bezel, 11 is an eject button, and 12 is an optical pickup.

  The optical disk device 1 includes a housing 2 and a tray 3 that is held in the housing 2 so as to be able to appear and retract. The housing 2 has a bag shape in which a metal upper housing portion 2 a and a lower housing portion 2 b are combined, and the tray 3 protrudes and emerges from an opening 8 a of the housing 2. An optical pickup module 4 is attached to the tray 3 from the back side. Rails 5 are movably provided on both sides of the tray 3, and the rails 5 are held by a tray-side rail holding portion 6 b provided integrally with the tray 3. In addition, in FIG. 5, although the rail 5 is provided only in one side part, the same rail may be provided in the other side part. The upper housing portion 2a and the lower housing portion 2b are firmly fixed to each other using a locking means and a spiral which are not shown.

  The optical pickup module 4 includes at least a spindle motor 7 that rotates the optical disk, a metal cover 8 that has an opening 8a from the spindle motor 7 to the outer periphery, and a carriage 9 that is partially exposed from the opening 8a. The carriage 9 is movably held by a plurality of guide shafts provided in the optical pickup module 4, and can be moved toward and away from the spindle motor 7 by a feed motor (not shown).

Reference numeral 10 denotes a bezel provided on the front surface of the tray 3, and the bezel 10 is configured to have a size enough to close the opening 8 a of the housing 2. The carriage 9 is equipped with a light source such as a high-power laser diode, various optical members, and an objective lens that forms a light spot on the optical disk. There is a fixed circuit board at the back of the housing 2, and a signal processing IC, a power supply circuit, and the like are mounted on the circuit board. A flexible printed circuit board that is electrically connected to circuit boards (not shown) provided on the tray 3 is formed in a substantially U shape, and an external connector is connected to a power / signal line provided in an electronic device such as a computer. Connected. Then, power is supplied into the optical disc apparatus through the external connector, an external signal is guided into the optical disc apparatus 1, or an electric signal generated by the optical disc apparatus 1 is sent to an electronic device or the like. The bezel 10 provided on the front end surface of the tray 3 is provided with an eject button 11, and when the eject button 11 is pressed, the engagement portion provided on the housing 2 and the engagement provided on the tray 3 are engaged. The tray 3 can be pulled out from the housing 2 so that the optical disk can be attached and detached.

  FIG. 6 is a view showing a rail of a conventional optical disc apparatus, and is a view showing a state where a stainless material is processed by a conventional method. In FIG. 6, 5 is a rail, 13 is a bending part. Since the rail 5 needs to hold the tray 3 in a state where the tray 3 is pulled out from the housing 2, the mechanical strength is given priority over the weight of the constituent material, and stainless steel is widely used.

  With the recent miniaturization of personal computers, optical disk devices are required to be thin and light. In particular, a built-in optical disk device mounted on a notebook personal computer or an external optical disk device is highly demanded to be excellent in mechanical strength and light in weight for convenient carrying. The relationship between mechanical strength and weight reduction is contradictory, and it is generally the case that pursuing mechanical strength hinders weight reduction, and the pursuit of weight reduction hinders mechanical strength.

As a prior example, there is (Patent Document 1) and the like.
Japanese Patent No. 2950136

  In order to reduce the thickness or weight of an optical disk device, it is indispensable to reduce the thickness and weight of components constituting them. For thinning and lightening, generally, techniques such as reducing the material thickness of the constituent materials or using lightweight materials are used, but in these cases, the structure is easily deformed by an external load at the same time. Or inconvenience occurs in the processing of the constituent materials.

  FIG. 7 is a view showing a rail of a conventional optical disc apparatus, and shows a state when a lightweight material such as an aluminum alloy is processed by a conventional construction method. In FIG. 7, 5 is a rail, 13 is a bending part. In the tray-type optical disc apparatus 1, stainless steel, which is one of iron-based materials, is widely used as a material for the rail 5 that supports the tray 3. This is because stainless steel is excellent in mechanical strength characteristics and has good elongation characteristics at the time of bending, so that the processing is easy.

  However, in order to further reduce the weight of the optical disc apparatus 1, it is not preferable to use stainless steel as the material of the rail 5, and attempts are currently being made to use a lightweight material such as an aluminum alloy. Regarding mechanical strength, mechanical strength equivalent to stainless steel could be secured by changing the raw material composition ratio of lightweight materials such as aluminum alloys, but the elongation characteristics during bending were 1/2 to Since it is about 1/3, workability is inferior to stainless steel. Therefore, when the rail 5 is formed by bending using a lightweight material such as an aluminum alloy, the bent portion 13 of the rail 5 shown in FIG. 7 is compared with the bent portion 13 of the rail 5 shown in FIG. Only the thickness of the corner portion of the bent portion 13 is greatly reduced, and the mechanical strength is deteriorated. This phenomenon becomes more prominent as the angle of the bent portion 13 is larger. However, this phenomenon is also affected by an angle of approximately 90 ° necessary for forming the rail 5.

  An object of the present invention is to solve the above-mentioned problems, and to provide an optical disc device capable of ensuring both mechanical strength and weight reduction even when a lightweight material is used as a rail material. And

The present invention includes a housing, a tray attached so as to be movable in and out of the housing, and a holding portion that holds the housing and the tray movably, and the holding portion is provided in the housing. An optical disk apparatus having a first rail mounting portion, a second rail mounting portion provided on the tray, and a rail slidably provided on the first and second rail mounting portions, wherein the rail is It has at least one of a curved surface portion or a flat surface portion connecting at least two surfaces of a plurality of surfaces constituting the inner surface of the bending portion.

  According to the present invention, the rail has at least one of a curved surface portion or a flat surface portion connecting at least two surfaces of the plurality of surfaces constituting the inner surface of the bending portion, so that the thickness of the bending portion generated during the bending of the rail is increased. A significant decrease in thickness can be mitigated, and deterioration of the mechanical strength of the bent portion can be prevented.

  As a result, even if a light material is used for the rail material, it is possible to realize an optical disc device capable of ensuring both mechanical strength and weight reduction.

  The invention according to claim 1 has a casing, a tray attached so as to be able to move in and out of the casing, and a holding section that holds the casing and the tray movably, and the holding section is the casing. An optical disc apparatus having a first rail mounting portion provided on the second rail mounting portion, a second rail mounting portion provided on the tray, and a rail slidably provided on the first and second rail mounting portions. The rail has at least one of a curved surface portion or a flat surface portion connecting at least two surfaces of the plurality of surfaces constituting the inner surface of the bending portion, and the rail is at least one of the plurality of surfaces constituting the inner surface of the bending portion. By having at least one of a curved surface portion or a flat surface portion connecting the two surfaces, it is possible to alleviate a significant decrease in the thickness of the bending portion that occurs during the processing of the rail, and to prevent deterioration of the mechanical strength of the bending portion. it can Because, notwithstanding the use of lightweight material in the rail material may be a balance between security and lighter mechanical strength, it is possible to reduce the weight of the optical disk apparatus.

  According to a second aspect of the present invention, at least one of the curved surface portion or the flat surface portion provided on the inner surface of the bent portion of the rail is formed by using a striking process, and is provided on the inner surface of the bent portion of the rail. Since at least one of the curved surface portion or the flat surface portion can be easily formed by using a striking process, even if a light material is used for the rail material, the mechanical property is not reduced without reducing the productivity. It is possible to ensure both strength and weight reduction, and to reduce the weight of the optical disc apparatus.

  The invention according to claim 3 is characterized in that the angle of the bent portion constituted by the two surfaces is approximately 90 °, and the angle of the bent portion constituted by the two surfaces is substantially 90 °. It is possible to easily form at least one of a curved surface portion or a flat surface portion provided on the inner surface of the bending portion of the rail by striking processing, even if a light material is used for the rail material, Without lowering productivity, it is possible to achieve both mechanical strength and weight reduction, and to reduce the weight of the optical disk apparatus.

  According to a fourth aspect of the present invention, the curved surface portion provided on the inner surface of the bent portion of the rail is formed by an arc having a radius in a direction perpendicular to the longitudinal direction of the rail, and the bent portion of the rail By forming the curved surface provided on the inner surface of a wide area, it is possible to prevent abrupt changes in the shape of the bent portion and efficiently prevent deterioration of the mechanical strength of the bent portion. Even if the optical disk device is used, both the mechanical strength can be ensured and the weight can be reduced, and the weight of the optical disk apparatus can be reduced.

The invention according to claim 5 includes a housing, a tray attached so as to be able to protrude and retract from the housing, and a holding portion that holds the housing and the tray movably, and the holding portion is the housing. An optical disc apparatus having a first rail mounting portion provided on the second rail mounting portion, a second rail mounting portion provided on the tray, and a rail slidably provided on the first and second rail mounting portions. The rail has at least one of a curved surface portion or a flat surface portion connecting at least two surfaces of a plurality of surfaces constituting the inner surface of the bending portion, and at least one of the curved surface portion or the flat surface portion provided in the bending portion. Is formed by using a striking process, the angle of the bent portion is approximately 90 °, and the curved surface portion is formed of an arc having a radial direction perpendicular to the longitudinal direction of the rail. To do It is possible to alleviate a significant decrease in the thickness of the bending part that occurs during the processing of the rail, and it is possible to efficiently and accurately prevent deterioration of the mechanical strength of the bending part. Even if the optical disk device is used, both the mechanical strength can be ensured and the weight can be reduced, and the weight of the optical disk apparatus can be reduced.

  The invention according to claim 6 is characterized in that at least one of the curved surface portion or the flat surface portion provided on the inner surface of the bent portion of the rail is formed by performing the striking process, The formation of at least one of the curved surface portion or the flat surface portion provided on the inner surface of the bending portion of the rail is performed simultaneously with the striking processing, thereby relieving a significant decrease in the thickness of the bending portion that occurs during the processing of the rail. Since the mechanical strength can be prevented from deteriorating, it is possible to ensure both the mechanical strength and reduce the weight even when a light material is used for the rail material, thereby reducing the weight of the optical disk apparatus. be able to.

(Embodiment 1)
FIG. 1 is an external view of an optical disc apparatus according to an embodiment of the present invention, and is a view in which a tray 3 is pulled out from a housing 2. In FIG. 1, 1 is an optical disk device, 2 is a housing, 3 is a tray, 4 is an optical pickup module, 5 is a rail, 6a is a housing side rail holding portion, 6b is a tray side rail holding portion, 7 is a spindle motor, 7a Is a disk mounting portion, 8 is a metal cover, 8a is an opening, 9 is a carriage, 10 is a bezel, 11 is an eject button, and 12 is an optical pickup.

  In FIG. 1, the housing 2 is configured in a bag shape by combining an upper housing portion 2a and a lower housing portion 2b. The upper housing part 2a and the lower housing part 2b are preferably firmly fixed to each other using a spiral or the like. The constituent material of the housing 2 is made of a metal material such as iron, iron alloy, aluminum, aluminum alloy, or magnesium alloy, or a resin material. Moreover, the upper housing part 2a and the lower housing part 2b may be made of the same material or different materials. Moreover, the average thickness of the main plane part of each of the upper casing part 2a and the lower casing part 2b is between 0.4 mm and 1.6 mm, and when the average thickness is relatively thin, the upper casing part 2a and the lower housing | casing part 2b are comprised with a metal material, for example, are formed by press work etc. of a metal plate. When the average wall thickness is relatively large, the upper housing portion 2a and the lower housing portion 2b are made of a resin material or die cast (such as an aluminum alloy or a magnesium alloy). When the housing 2 is made of a resin material, the optical disk device 1 can be reduced in weight. Reference numeral 3 denotes a tray that is provided in the housing 2 so as to be freely movable. The tray 3 is composed of a resin frame, and an optical pickup module 4 is provided. The optical pickup module (PUM) 4 includes an optical pickup 12 constituting an optical system, a spindle motor 7 for rotating the disk, and a control circuit (not shown). The optical pickup 12 performs at least one of an operation of writing information to or reading information from the optical disc by irradiating the optical disc with light. The spindle motor 7 has a disk mounting portion 7a for mounting and rotating the disk. There are tray-side rail holding portions 6b on both sides of the tray 3, and both sides are fitted to the rail 5 so as to be slidable in the disk pull-out direction. The rail 5 is also fitted to rail guides provided on the inner surfaces of both sides of the housing 2 so as to be slidable in the disk pull-out direction, and the tray 3 can be pulled out from the housing 2 so that the disk can be attached and detached.

  There is a fixed control board at the back of the housing 2, and a signal processing system IC, a power supply circuit, and the like are mounted on the control board. A flexible printed circuit board that electrically connects control boards (not shown) provided on the tray 3 is formed in a substantially U shape, and an external connector is connected to a power / signal line provided in an electronic device such as a computer. Connected. Then, power is supplied into the optical disc apparatus via the external connector, an electric signal from the outside is guided into the optical disc apparatus 1, or an electric signal generated by the optical disc apparatus 1 is sent to an electronic device or the like. . The bezel 10 provided on the front end surface of the tray 3 is provided with an eject button 11. By pressing the eject button 11, an engaging portion (not shown) provided in the housing 2 and the tray 3 are provided. The engagement with the engaging portion (not shown) provided in the is released.

  Hereinafter, the characteristic part of Embodiment 1 of this invention is demonstrated.

  FIG. 2 is a diagram showing a rail of the optical disk device according to Embodiment 1 of the present invention, and a surface connecting two surfaces constituting the inner surface of the bent portion of the rail is a curved surface portion. FIG. 2A is a view showing the entire rail, and FIG. 2B is an enlarged view showing a portion of the present invention of FIG. 2A. In FIG. 2, 5 is a rail, 13 is a bent portion, 14 is a curved surface portion, and 16 and 17 are surfaces. FIG. 4 is a diagram showing the bending process of the rail of the optical disk apparatus. In FIG. 4, 5 is a rail, 18 is a punch, 19 is a die, 20 is a punch, 21 is a protrusion, 22 is a guide, and 23 is a die. Since the rail 5 needs to hold the tray 3 in a state in which the tray 3 is pulled out from the housing 2, mechanical strength is given priority over weight as a characteristic of the constituent material, and stainless steel has been widely used conventionally. . Further, since the rail 5 needs to be slidably provided with the housing side rail holding portion 6a provided in the housing 2 and the tray side rail holding portion 6b provided in the tray 3, high dimensional accuracy is required. is there. Therefore, a technique called striking is generally used for processing the rail 5.

  The striking process is a technique for improving the accuracy of the bending angle in the bending process of the metal material, and is in contact with the rail 5 of the die 19 of the bending mold 1 shown in FIGS. 4 (a) and 4 (b). The main object is to reduce the return stress generated during the bending process by installing a rectangular parallelepiped protrusion 21 in a part of the portion to be punched and punching a metal material using the protrusion 21. Here, bending of the rail 5 by the bending mold 1 and the bending mold 2 will be described with reference to FIG. First, the rail 5 that needs to be bent is inserted into the gap formed by the punch 18 and the die 19 of the bending die 1 in a predetermined amount in the direction of the arrow (1). The rail 5 inserted by a predetermined amount is sandwiched between the punch 18 and the die 19 when the punch 18 moves in the direction of the arrow (2), and is subjected to a striking process by the protrusion 21 provided on the die 19. Next, the rail 5 subjected to the striking process moves from the bending mold 1 to the bending mold 2. The moved rail 5 is inserted into the gap formed by the guide 22 and the die 23 of the bending die 2 shown in FIG. 4 (c) by a specified amount in the direction of the arrow (3). When the guide 22 moves in the arrow direction (4), the guide 22 and the die 23 are sandwiched and fixed, and finally the punch 20 shown in FIG. 4 (d) moves in the arrow direction (5) to apply pressure. Thus, the bent portion 13 of the rail 5 is formed. Since the stress generated during the bending process is reduced, the bending part 13 of the rail 5 subjected to the striking process can obtain an accurate squareness. As shown in FIG. 4, a rectangular parallelepiped projection 21 provided on the die 19 of the bending mold 1 used for processing the rail 5 of the optical disc apparatus 1 has a width of about 1 mm and a height of about 0.05 mm. When the bending portion 13 is formed from the mold 1 and the bending die 2, a rail bending portion as shown in FIG. 6 is obtained.

  In the present invention, the rail 5 is provided with at least one of a curved surface portion or a flat surface portion connecting at least two surfaces of a plurality of surfaces constituting the inner surface of the bending portion 13.

In the present embodiment, the rail 5 is provided with the curved surface portion 14 connecting the two surfaces 16 and 17 from a plurality of surfaces constituting the inner surface of the bending portion 13 as shown in FIG. The curved surface portion 14 provided on the inner surface of the bending portion 13 is formed by using a striking process, and the angle of the bending portion formed by the two surfaces 16 and 17 is approximately 90 °, that is, about 85 ° to 95 °. The curved surface portion 14 is formed by an arc having a radial direction perpendicular to the longitudinal direction of the rail 5. The place where the curved surface portion 14 is provided may be at least one of the bent portions 13 arranged on the rail 5, or may be provided on all of the bent portions 13 arranged on the rail 5 as shown in FIG. good. In order to maximize the balance between securing the mechanical strength and reducing the weight, it is preferable to provide the curved portion 14 at all the bent portions 13 arranged on the rail 5.

  Here, a case where the material of the rail is changed to reduce the weight of the optical disc apparatus will be described. In order to reduce the weight of the optical disc apparatus 1, when the constituent material of the rail 5 which is a constituent part thereof is changed from stainless steel to a lightweight material such as an aluminum alloy, deterioration occurs in terms of mechanical strength and ease of processing. In terms of mechanical strength, the strength equivalent to stainless steel could be ensured by changing the raw material composition ratio of lightweight materials such as aluminum alloys. However, in terms of ease of processing, the elongation characteristics during bending were 1 compared to stainless steel. Since it is about / 2 to 1/3, workability is inferior to stainless steel.

  When such a light-weight material such as an aluminum alloy is used as it is for the material of the rail 5 of the optical disc apparatus 1, the bent portion 13 is shaped as shown in FIG. 7 by the striking process when the bending process is performed. Therefore, when the rail 5 is formed by bending using a lightweight material such as an aluminum alloy, the thickness of the corner portion of the bent portion 13 of the rail 5 is greatly reduced, and the mechanical strength is deteriorated.

  However, in the embodiment of the present invention shown in FIG. 2, the rail 5 is conventionally provided with a curved surface portion 14 connecting the two surfaces 16 and 17 from a plurality of surfaces constituting the inner surface of the bent portion 13, thereby performing a conventional striking process. Thus, it is possible to relieve the stress at the angle forming portion received when forming the bent portion 13, that is, the significant decrease in the thickness of the bent portion 13 generated during the bending of the rail 5.

  Therefore, the rail 5 can prevent the mechanical strength deterioration of the bending part 13, and even if it uses a lightweight material for the rail material, it is possible to achieve both ensuring of the mechanical strength and weight reduction. The optical disc device 1 can be realized.

  In the present embodiment, the angle of the bent portion 13 formed by the two surfaces 16 and 17 is not limited to approximately 90 °, but the curved surface portion 14 provided on the inner surface of the bent portion 13 of the rail 5. If the flat portion 15 is to be easily formed, the angle of the bent portion 13 formed by the two surfaces 16 and 17 is preferably approximately 90 °. Further, the curved surface portion 14 is not limited to the circular arc having a radial direction perpendicular to the longitudinal direction of the rail 5, but if the effect of the present invention is to be maximized, the rail 14 The arc having a radial direction perpendicular to the longitudinal direction of the rail 5 can prevent a sharp shape change of the bent portion 13 by forming the curved surface portion 14 provided on the inner surface of the bent portion 13 over a wide range. It is preferable to comprise.

(Embodiment 2)
A case where the rail 5 has a flat surface portion connecting at least two surfaces of a plurality of surfaces constituting the inner surface of the bending portion 13 will be described.

FIG. 3 is a diagram showing a rail of the optical disk device according to the second embodiment of the present invention, and a plane connecting two surfaces constituting the inner surface of the bent portion of the rail is a plane portion. FIG. 3A is a view showing the entire rail, and FIG. 3B is an enlarged view showing a portion of the present invention of FIG. 3A. The configuration of the entire optical disc apparatus is the same as that of the first embodiment. In FIG. 3, 5 is a rail, 13
Is a bent portion, 15 is a plane portion, and 16 and 17 are surfaces. FIG. 4 is a diagram showing the bending process of the rail of the optical disk apparatus. In FIG. 4, 5 is a rail, 18 is a punch, 19 is a die, 20 is a punch, 21 is a protrusion, 22 is a guide, and 23 is a die.

  Hereinafter, the characteristic part of Embodiment 2 of this invention is demonstrated.

  Since the rail 5 needs to hold the tray 3 in a state in which the tray 3 is pulled out from the housing 2, mechanical strength is given priority over weight as a characteristic of the constituent material, and stainless steel has been widely used conventionally. . Further, since the rail 5 needs to be slidably provided with the housing side rail holding portion 6a provided in the housing 2 and the tray side rail holding portion 6b provided in the tray 3, high dimensional accuracy is required. is there. Therefore, a technique called striking is generally used for processing the rail 5.

  The striking process is a technique for improving the accuracy of the bending angle in the bending process of the metal material, and is in contact with the rail 5 of the die 19 of the bending mold 1 shown in FIGS. 4 (a) and 4 (b). The main object is to reduce the return stress generated during the bending process by installing a rectangular parallelepiped protrusion 21 in a part of the portion to be punched and punching a metal material using the protrusion 21. Here, bending of the rail 5 by the bending mold 1 and the bending mold 2 will be described with reference to FIG. First, the rail 5 that needs to be bent is inserted into the gap formed by the punch 18 and the die 19 of the bending die 1 in a predetermined amount in the direction of the arrow (1). The rail 5 inserted by a predetermined amount is sandwiched between the punch 18 and the die 19 when the punch 18 moves in the direction of the arrow (2), and is subjected to a striking process by the protrusion 21 provided on the die 19. Next, the rail 5 subjected to the striking process moves from the bending mold 1 to the bending mold 2. The moved rail 5 is inserted into the gap formed by the guide 22 and the die 23 of the bending die 2 shown in FIG. 4 (c) by a specified amount in the direction of the arrow (3). When the guide 22 moves in the arrow direction (4), the guide 22 and the die 23 are sandwiched and fixed, and finally the punch 20 shown in FIG. 4 (d) moves in the arrow direction (5) to apply pressure. Thus, the bent portion 13 of the rail 5 is formed. Since the stress generated during the bending process is reduced, the bending part 13 of the rail 5 subjected to the striking process can obtain an accurate squareness. As shown in FIG. 4, a rectangular parallelepiped projection 21 provided on the die 19 of the bending mold 1 used for processing the rail 5 of the optical disc apparatus 1 has a width of about 1 mm and a height of about 0.05 mm. When the bending portion 13 is formed from the mold 1 and the bending die 2, the bending portion 13 of the rail 5 as shown in FIG. 6 is obtained.

  In the present invention, the rail 5 is provided with at least one of a curved surface portion or a flat surface portion connecting at least two surfaces of a plurality of surfaces constituting the inner surface of the bending portion 13.

  In the present embodiment, the rail 5 is provided with the flat surface portion 15 that connects the two surfaces 16 and 17 from a plurality of surfaces constituting the inner surface of the bending portion 13 as shown in FIG. The flat surface portion 15 provided on the inner surface of the bending portion 13 is formed by using a striking process, and the angle of the bending portion 13 constituted by the two surfaces 16 and 17 is approximately 90 °, that is, about 85 ° to 95 °. To do. The place where the flat portion 15 is provided may be at least one of the bent portions 13 arranged on the rail 5, or may be provided on all of the bent portions 13 arranged on the rail 5 as shown in FIG. Alternatively, it may be used together with the curved surface portion 14 connecting the two surfaces 16, 17 from a plurality of surfaces constituting the inner surface of the bending portion 13 shown in FIG. In order to maximize the balance between securing the mechanical strength and reducing the weight, it is preferable to provide the place where the flat surface portion 15 and the curved surface portion 14 are provided in all the bending portions 13 arranged on the rail 5.

Here, a case where the material of the rail 5 is changed to reduce the weight of the optical disc apparatus 1 will be described. In order to reduce the weight of the optical disc apparatus 1, when the constituent material of the rail 5 which is a constituent part thereof is changed from stainless steel to a lightweight material such as an aluminum alloy, deterioration occurs in terms of mechanical strength and ease of processing. In terms of mechanical strength, the strength equivalent to stainless steel could be secured by changing the raw material composition ratio of lightweight materials such as aluminum alloys. However, in terms of ease of processing, the elongation characteristics during bending are higher than that of stainless steel. Since it is about 1/2 to 1/3, workability is inferior to stainless steel.

  When such a light-weight material such as an aluminum alloy is used as it is for the material of the rail 5 of the optical disc apparatus 1, the bending portion 13 is shaped as shown in FIG. 7 by the striking process when the bending process is performed. Therefore, when the rail 5 is formed by bending using a lightweight material such as an aluminum alloy, the thickness of the corner portion of the bent portion 13 of the rail 5 is greatly reduced, and the mechanical strength is deteriorated.

  However, in the second embodiment of the present invention shown in FIG. 3, by providing the planar portion 15 connecting the two surfaces 16 and 17 from the plurality of surfaces constituting the inner surface of the bending portion 13 on the rail 5, the conventional striking process is performed. It is possible to relieve the stress at the angle forming portion received when forming the bending portion 13, that is, the significant decrease in the thickness of the bending portion 13 that occurs during the bending of the rail 5.

  Therefore, the rail 5 can prevent the mechanical strength deterioration of the bending part 13, and even if it uses a lightweight material for the rail material, it is possible to achieve both ensuring of the mechanical strength and weight reduction. The optical disc device 1 can be realized.

  In the second embodiment, the bending angle of the bending portion 13 composed of two surfaces is not limited to approximately 90 °, and the curved surface portion 14 or the flat surface provided on the inner surface of the bending portion 13 of the rail 5 is not limited. If the portion 15 is to be easily formed, the angle of the bent portion 13 constituted by the two surfaces is preferably approximately 90 °.

  The second embodiment can also be used together with the first embodiment.

  The present invention can realize an optical disc apparatus that can achieve both ensuring of mechanical strength and weight reduction even when a light material is used as a rail material. The present invention can be applied to an optical disc apparatus that performs at least one of information recording and reproduction.

1 is an external view of an optical disc apparatus according to an embodiment of the present invention. The figure which shows the rail of the optical disk apparatus in Embodiment 1 of this invention The figure which shows the rail of the optical disk apparatus in Embodiment 2 of this invention The figure which shows the bending process of the rail of the optical disk device External view of conventional optical disk device The figure which shows the rail of the conventional optical disk device The figure which shows the rail of the conventional optical disk apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk apparatus 2 Housing | casing 2a Upper housing | casing part 2b Lower housing | casing part 3 Tray 4 Optical pick-up module 5 Rail 6a Chassis side rail holding part 6b Tray side rail holding part 7 Spindle motor 7a Disk mounting part 8 Metal cover 8a Opening 9 Carriage 10 Bezel 11 Eject Button 12 Optical Pickup 13 Bending Part 14 Curved Part 15 Plane Part 16 Side 17 Side 18 Punch 19 Die 20 Punch 21 Protrusion 22 Guide 23 Die

Claims (6)

A first rail provided on the casing; and a holding portion that movably holds the casing and the tray. An optical disc apparatus having an attachment portion, a second rail attachment portion provided on the tray, and a rail slidably provided on the first and second rail attachment portions, wherein the rail is an inner surface of a bending portion. An optical disc apparatus characterized by having at least one of a curved surface portion or a flat surface portion connecting at least two surfaces of a plurality of surfaces constituting the surface. 2. The optical disc apparatus according to claim 1, wherein at least one of a curved surface portion or a flat surface portion provided on an inner surface of the bent portion of the rail is formed by using a striking process. The optical disc apparatus according to claim 1, wherein an angle of the bending portion formed by the two surfaces is approximately 90 °. The curved surface part provided in the inner surface of the bending part of the said rail was comprised by the circular arc which has a radius in the orthogonal | vertical direction with respect to the longitudinal direction of the said rail, The Claim 1 characterized by the above-mentioned. Optical disk device. A first rail provided on the casing; and a holding portion that movably holds the casing and the tray. An optical disc apparatus having an attachment portion, a second rail attachment portion provided on the tray, and a rail slidably provided on the first and second rail attachment portions, wherein the rail is an inner surface of a bending portion. At least one of a curved surface portion or a flat surface portion connecting at least two surfaces of the plurality of surfaces, and at least one of the curved surface portion or the flat surface portion provided in the bent portion is formed by using a striking process. The angle of the bent portion is approximately 90 °, and the curved surface portion is formed by an arc having a radial direction perpendicular to the longitudinal direction of the rail. 6. The optical disc according to claim 1, wherein at least one of a curved surface portion or a flat surface portion provided on an inner surface of the bent portion of the rail is formed by performing the striking process. Device manufacturing method.

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