JP2012038394A - Optical disk reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk reproducer capable of controlling temperature rise of an optical pickup while reducing electric power consumption.SOLUTION: An optical disk reproducer 1 comprises: a spindle motor 71 for spinning an optical disk 10; an optical pickup 72 for projecting light on the optical disk 10 and receiving reflected light from the optical disk 10; and a fan 26 for circulating the air around the optical pickup 72. The optical disk reproducer 1 spins the optical disk 10 by using the spindle motor 71, projects the light on the optical disk 10 and also receives the reflected light from the optical disk 10 by using the optical pickup 72 so as to read recording data from the optical disk 10. The fan 26 is driven when an angular velocity of the spinning of the optical disk 10 is slower than a predetermined angular velocity, and the fan 26 is stopped when the angular velocity of the spinning of the optical disk 10 is not slower than the predetermined angular velocity.

Description

  The present invention relates to an optical disk reproducing apparatus that reads recorded data from an optical disk.

  2. Description of the Related Art Conventionally, an optical disk reproducing apparatus is configured to read recorded data from an optical disk by rotating the optical disk by a spindle motor, projecting light onto the optical disk by an optical pickup, and receiving reflected light from the optical disk. In such an optical disk reproducing apparatus, it is necessary to cool the inside of the apparatus (particularly around the optical pickup) in order to maintain the ambient temperature at which the optical pickup is used. Particularly, since the portable optical disk reproducing apparatus is small and has a small apparatus volume, the cooling capacity of heat-generating parts such as ICs is extremely low, and it is important to cool the inside of the apparatus. Further, since the high function IC generates a large amount of heat, it is important to cool the inside of the apparatus even when the high function IC is used.

  Therefore, in an optical disk reproducing apparatus, an apparatus in which the inside of the apparatus is cooled by using an air flow generated by the rotation of the optical disk is considered. Also known is a device in which a fan is provided inside the apparatus, an air flow is generated by the fan, and the inside of the apparatus is cooled by the air flow generated by the fan (for example, see Patent Documents 1 to 5). .

JP-A-9-147541 JP 2004-164733 A Japanese Patent No. 2988471 JP 2005-93023 A JP 2006-179071 A

  By the way, reading of recording data from the optical disk is performed by keeping the linear velocity of the optical disk at a recording data reading position on the optical disk constant at a predetermined linear velocity. That is, the rotational speed (angular speed of rotation) of the optical disk differs depending on the reading position of the recording data from the optical disk. When the recording data on the inner circumference side of the optical disk is being read, the rotational speed of the optical disk is high (the angular speed of rotation is high). ) When the recording data on the outer peripheral side of the optical disk is being read, the rotation speed of the optical disk is low (the angular velocity of rotation is low).

  For this reason, in the configuration in which the inside of the apparatus is cooled by using the air flow generated by the rotation of the optical disk, it is generated by the rotation of the optical disk when the rotation speed is low (when the recording data on the outer peripheral side of the optical disk is read). The airflow becomes weak and the effect of cooling the inside of the apparatus is reduced. As a result, an increase in the temperature of the optical pickup cannot be suppressed, and the use ambient temperature of the optical pickup cannot be maintained, which may hinder the operation.

  Further, in the configuration in which the inside of the apparatus is cooled by the air flow generated by the fan, electric power for driving the fan is required, and power consumption increases. In particular, when the optical disk playback apparatus is a portable type that operates on battery power, the battery power is consumed in a short time by driving the fan, which hinders long-term use. There is a fear.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical disc reproducing apparatus capable of suppressing a temperature rise of an optical pickup while suppressing power consumption.

  In order to achieve the above object, the invention of claim 1 is directed to a spindle motor for rotating an optical disk, and moves in a direction toward and away from the spindle motor to project light onto the optical disk and to reflect light from the optical disk. In an optical disk reproducing apparatus that includes an optical pickup for receiving light, rotates an optical disk by a spindle motor, projects light onto the optical disk by an optical pickup, and receives reflected light from the optical disk to read recorded data from the optical disk. A fan that takes in and sends out air and distributes the air around the optical pickup, and fan drive control means for controlling the drive of the fan. The fan drive control means receives the recording data from the optical disc. When the scanning operation is being performed, the It drives down, when not the predetermined conditions, is to stop the driving of the fan.

  According to a second aspect of the present invention, in the optical disk reproducing apparatus according to the first aspect, the predetermined situation is a situation where the angular velocity of rotation of the optical disk is slower than the predetermined angular velocity, and the fan drive control means The fan is driven when the angular velocity is lower than the predetermined angular velocity, and the fan is stopped when the angular velocity of the rotation of the optical disk is not lower than the predetermined angular velocity.

  According to a third aspect of the present invention, in the optical disk reproducing apparatus according to the first aspect, when the spindle motor is performing the operation of reading the recording data from the optical disk, the linear velocity of the optical disk at the reading position of the recording data on the optical disk The optical disk is rotated so that the linear velocity becomes a predetermined linear velocity. The predetermined situation is a situation where the position of the optical pickup is farther from the spindle motor than the predetermined position. Drives the fan when the position is farther from the spindle motor than the predetermined position, and stops driving the fan when the position of the optical pickup is not farther from the spindle motor than the predetermined position To do.

  According to a fourth aspect of the present invention, in the optical disk reproducing apparatus according to the first aspect, when the spindle motor is performing an operation of reading the recording data from the optical disk, the linear velocity of the optical disk at the reading position of the recording data on the optical disk The optical disk is rotated so that the predetermined linear velocity is obtained, and the predetermined situation is a situation in which the reading position of the recording data on the optical disk is on the outer peripheral side of the optical disk with respect to the predetermined reading position. When the reading position of the recording data on the optical disk is in the outer peripheral side of the optical disk from the predetermined reading position, the fan is driven so that the reading position of the recording data on the optical disk is higher than the predetermined reading position. When the situation is not on the outer peripheral side, the drive of the fan is stopped.

  According to a fifth aspect of the present invention, in the optical disk reproducing apparatus according to the first aspect, the predetermined situation is a situation where the temperature of the air around the optical pickup is higher than the predetermined temperature, and the fan drive control means The fan is driven when the temperature of the air around the pickup is higher than the predetermined temperature, and the fan is stopped when the temperature of the air around the optical pickup is not higher than the predetermined temperature. To do.

  According to a sixth aspect of the present invention, in the optical disk reproducing apparatus according to the first aspect, the bracket is provided on the circuit board, the traverse chassis is provided on the bracket and supports the spindle motor and the optical pickup, and the fan is sent out from the fan. A duct for guiding air to the periphery of the optical pickup, and a gap communicating with the space in which the optical pickup moves is provided between the bracket and the traverse chassis, and the duct is sent from the fan. An air inlet through which air flows in, and an air outlet through which air flows in from the air inlet, and the air outlet has an area smaller than the area of the air inlet, the bracket, the chassis, It faces the gap between the two.

  According to the first to sixth aspects of the present invention, the fan is driven when it is not sufficient to use the airflow generated by the rotation of the optical disk to suppress the temperature rise of the optical pickup. When it is sufficient to use the airflow generated by the rotation of the optical disk, it is possible to stop driving the fan. Therefore, by controlling the driving of the fan in this way, it is possible to suppress an increase in the temperature of the optical pickup while suppressing power consumption.

(A) is a perspective view of the state which closed the disk cover which shows schematic structure of the optical disk reproducing device based on one Embodiment of this invention, (b) is a perspective view of the state which opened the disk cover. (A) is a perspective view of the main body unit of the optical disk reproducing apparatus, and (b) is a perspective view of a state in which the upper case of the main body unit is separated from the lower case. (A) is sectional drawing seen from the upper surface of the main body unit, (b) is sectional drawing seen from the side surface of the main body unit. The electrical block block diagram of the optical disk reproducing device. The figure which shows the experimental result of the experiment which verifies the effect which suppresses the temperature rise of the optical pick-up in the same optical disk reproducing | regenerating apparatus.

  Hereinafter, an optical disk reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIGS. 1A and 1B show the configuration of the optical disk reproducing apparatus according to the present embodiment. The optical disk playback apparatus 1 is an apparatus that reads recorded data from an optical disk 10 such as a DVD or a BD. The optical disc playback apparatus 1 is a portable type.

  The optical disk reproducing apparatus 1 includes a main unit 2, a display unit 3, and a hinge unit 4. The display unit 3 is attached to the main unit 2 via the hinge unit 4, and the display unit 3 is attached to the main unit 2. It can rotate with respect to it. Further, the optical disc reproducing apparatus 1 includes a battery pack 5 and is operated by electric power supplied from the battery pack 5.

  In the main unit 2, the optical disk 10 is stored in the disk chamber 21, and the recording data is read from the optical disk 10 by rotating the optical disk 10 stored in the disk chamber 21. The disc chamber 21 is opened so that the optical disc 10 can be accommodated and taken out by opening the disc cover 22, and closed by closing the disc cover 22. The display unit 3 displays an image based on recording data read from the optical disc 10 by the main unit 2 and various images such as a menu screen.

  The hinge unit 4 is a hinge unit called a two-axis swivel hinge, and the display unit 3 is connected to the main unit 2 so as to be rotatable in two orthogonal axes. That is, the display unit 3 can be rotated with respect to the main body unit 2 about the first rotation center axis C1 that passes through the lower end portion of the display unit 3 and is parallel to the lower end edge of the display unit 3. In addition, it can rotate about the second rotation center axis C2 that passes through the center of the rear end portion of the main unit 2 and is perpendicular to the upper surface of the main unit 2.

  The battery pack 5 supplies power to the optical disc playback apparatus 1 and is configured to be detachable from the main unit 2. The battery pack 2 has a built-in secondary battery. When the battery pack 2 is attached to the main unit 2, the power of the secondary battery is supplied to the main unit 2.

  When using the optical disc reproducing apparatus 1, for example, the display unit 3 is opened (the display unit 3 is raised with respect to the main unit 2 or the back of the display unit 3 (the surface opposite to the image display surface). ) In a state where the display unit 3 is laid down with respect to the main body unit 2 so as to be aligned with the upper surface of the main body unit 2. Further, when carrying the optical disk reproducing device 1 by carrying it, for example, the display unit 3 is closed (the front unit (image display surface) of the display unit 3 is aligned with the upper surface of the main unit 2). 2). Further, the optical disc playback apparatus 1 can be used by connecting an external device (not shown) (displaying an image based on recorded data read from the optical disc by the optical disc playback apparatus 1 on the display of the external device). When the external device is connected and used, for example, the display unit 3 is closed.

  FIGS. 2A and 2B and FIGS. 3A and 3B show the configuration of the main unit 2. The main unit 2 includes a main body case 20, a disk chamber 21 for storing the optical disk 10, a disk cover 22 for opening and closing the disk chamber 21, an optical disk reading unit 23 for reading recording data from the optical disk 10, And a circuit board 24 for controlling the operation of the optical disk reproducing apparatus 1. An electronic component 25 (for example, a heat-generating component such as an IC) that constitutes a control circuit that controls the operation of the optical disc playback apparatus 1 is mounted on the circuit board 24. Further, the main unit 2 includes a fan 26 that takes in and sends out air and circulates the air, and a duct 27 that guides the air sent out from the fan 26 to an area where the air is circulated.

  The body case 20 houses an optical disk reading unit 23, a circuit board 24, a fan 26, and a duct 27. The main body case 20 includes a lower case 31 that occupies the lower portion of the main body case 20 and an upper case 32 that occupies the upper portion of the main body case 20, and the lower case 31 and the upper case 32 are coupled to each other. Yes.

  The main body case 20 includes an air inlet 41 for sucking air into the main body case 20 from the outside of the main body case 20 and an air exhaust for discharging air from the main body case 20 to the outside of the main body case 20. Outlets 42a and 42b are provided. The air inlet 41 is provided on the front wall 31 a of the lower case 31. The air discharge port 42 a is provided on one side wall 31 b of the lower case 31, and the air discharge port 42 b is provided on the other side wall 31 c (opposing the side wall 31 b) of the lower case 31.

  The disk chamber 21 has a bottom wall 51 and an outer peripheral side wall 52. The bottom wall 51 and the outer peripheral side wall 52 of the disk chamber 21 are constituted by a part of the upper case 32 of the main body case 20. The inside of the disk chamber 21 is separated from the inside of the main body case 20 by a bottom wall 51 and an outer peripheral side wall 52. The bottom wall 51 is formed flat, and the outer peripheral side wall 52 rises vertically from the bottom wall 51. The optical disc 10 is stored in an area surrounded by the bottom wall 51 and the outer peripheral side wall 52. The bottom wall 51 is provided with a reading opening 61 used for reading recording data from the optical disc 10.

  The disc cover 22 is attached to the upper case 32 of the main body case 20 so that it can be opened and closed. By opening the disc cover 22, the disc chamber 21 is opened so that the optical disc 10 can be stored and taken out. By closing the disc cover 22, the disc chamber 21 is closed.

  The optical disk reading unit 23 is a light that emits light to the optical disk 10 and receives reflected light from the optical disk 10 and outputs a received light signal corresponding to the received light intensity. A pickup 72 and a seek motor 73 for moving the optical pickup 72 are included. The optical disk reading unit 23 includes a traverse chassis 74 that supports the spindle motor 71, the optical pickup 72, and the seek motor 73, a traverse cover 75, a bracket 76, and the like.

  The traverse chassis 74 has a lower wall portion 74a and peripheral wall portions 74b, 74c, 74d, and 74e. The lower wall portion 74a has an opening at the center, and the peripheral wall portions 74b, 74c, 74d, and 74e rise from the outer peripheral edge of the lower wall portion 74a. The traverse chassis 74 is provided on the bracket 76 so that the lower wall portion 74 a is in contact with the upper surface of the bracket 76.

  The traverse cover 75 is provided on the traverse chassis 74 so as to contact the upper ends of the peripheral wall portions 74b, 74c, 74d, and 74e of the traverse chassis 74. A cover opening 75 a is provided at the center of the traverse cover 75. A spindle motor 71, an optical pickup 72, and a seek motor 73 are disposed in a space surrounded by the traverse chassis 74, the traverse cover 75, and the bracket 76. Hereinafter, a space surrounded by the traverse chassis 74, the traverse cover 75, and the bracket 76 is referred to as a space in the optical disc reading unit 23.

  The spindle motor 71 is attached to the traverse chassis 74, and a disk mounting portion 71 a on which the optical disk 10 is mounted protrudes from the upper surface of the traverse cover 75 through the cover opening 75 a of the traverse cover 75.

  The optical pickup 72 is supported by a guide rail 77 attached to the traverse chassis 74 so as to be movable toward and away from the spindle motor 71. A light projecting / receiving unit 72 a for projecting and receiving light is provided on the traverse cover 75. It faces the cover opening 75a.

  The seek motor 73 is attached to the traverse chassis 74, and a gear 78 is attached to the seek motor 73. The gear 78 meshes with a rack 79 attached to the optical pickup 72. When the seek motor 73 is rotated, the gear 78 is rotated, and the optical pickup 72 is moved together with the rack 79 (guided by the guide rail 77 and moved toward and away from the spindle motor 71). That is, the seek motor 73 moves the optical pickup 72 (via the gear 78 and the rack 79).

  Between the bracket 76 and the traverse chassis 74, gaps 80a and 80b communicating with the space in the optical disk reading unit 23 (that is, the space in which the optical pickup 72 moves) are provided. The gap 80 a is provided at the edge of the traverse chassis 74 on the peripheral wall portion 74 b side, and the gap 80 b is provided at the edge of the traverse chassis 74 on the peripheral wall portion 74 d side.

  In the optical disc reading unit 23 having such a configuration, the bracket 76 is provided on the circuit board 24 and disposed on the circuit board 24. The disc mounting portion 71 a of the spindle motor 71 protrudes from the reading opening 61 of the disc chamber 21 into the disc chamber 21, and the light projecting / receiving portion 72 a of the optical pickup 72 is in the reading opening 61 of the disc chamber 21. I'm here. The space in the optical disk reading unit 23 and the inside of the disk chamber 21 communicate with each other through a cover opening 75 a and a reading opening 61.

  The optical disk 10 is mounted on the spindle motor 71 (in the disk mounting portion 71 a) inside the disk chamber 21 and is stored in the disk chamber 21. The spindle motor 71 rotates the optical disk 10 inside the disk chamber 21, and the optical pickup 72 projects light to the optical disk 10 through the cover opening 75 a of the traverse cover 75 and the reading opening 61 of the disk chamber 21 and the optical disk. The reflected light from 10 is received.

  Reading of recording data from the optical disk 10 is performed by rotating the optical disk 10 by the spindle motor 71 and projecting light onto the optical disk 10 by the optical pickup 72 and receiving reflected light from the optical disk 10. At this time, the optical pickup 72 is moved by the seek motor 73, so that the reading position of the recording data on the optical disc 10 is adjusted.

  The fan 26 circulates air around the optical pickup 72, and is driven to take air from the air intake port 26a and send air from the air outlet 26b. The air intake port 26 a faces the air intake port 41 of the main body case 20 at a position adjacent to the air intake port 41. The fan 26 is a blower type fan.

  The duct 27 guides the air sent out from the fan 26 to the periphery of the optical pickup 72, and includes an air inlet 27a through which air flows in and an air outlet 27b through which air flows in from the air inlet 27a. And when air flows in from the air inlet 27a, the air flows out of the air outlet 27b. The air inlet 27 a faces the air outlet 26 b at a position adjacent to the air outlet 26 b of the fan 26, and the air outlet 27 b is adjacent to the gap 80 a between the bracket 76 and the chassis 74. 2 is opposed to the gap 80 a between the bracket 76 and the chassis 74. The area of the air outlet 27b is smaller than the area of the air inlet 27a in order to strengthen the flow of air flowing out from the air outlet 27b.

  In the optical disk reproducing apparatus 1 having such a configuration, when the optical disk 10 mounted on the spindle motor 71 rotates in a state where the drive of the fan 26 is stopped, the optical disk is rotated inside the disk chamber 21 by the rotation of the optical disk 10. 10 airflows in the rotational direction are generated.

  At this time, the space in the optical disk reading unit 23 (the space in which the optical pickup 72 moves) communicates with the inside of the disk chamber 21 via the cover opening 75a and the reading opening 61, thereby An air flow is generated in the space in the optical disc reading unit 23 by the air flow generated inside (the air flow caused by the rotation of the optical disc 10). Due to this airflow, air flows from the outside of the main body case 20 through the air inlet 41 and the gap 80a into the space in the optical disk reading unit 23, and from the space in the optical disk reading unit 23, the gap 80b and the air outlet. Air is discharged to the outside of the main body case 20 through 42a and 42b.

  As a result, the air around the optical pickup 72 flows and the optical pickup 72 is cooled. The cover opening 75a, the reading opening 61, the air suction port 41, the air discharge ports 42a and 42b, the gap 80a, and the gap 80b are configured to cool the optical pickup 72 using the airflow generated by the rotation of the optical disc 10. ing.

  Further, when the fan 26 is driven, the fan 26 takes in air from the air intake port 26a and sends out air from the air outlet 26b. At this time, since the air intake port 26a faces the air intake port 41 at a position adjacent to the air intake port 41, the air intake port 41a passes through the air intake port 41 from the outside of the main body case 20. Air is taken into the opening 26a, and the air is sent out from the air outlet 26b.

  The air sent out from the air outlet 26b flows into the air inlet 27a of the duct 27, is guided to the duct 27, and flows out of the air outlet 27b of the duct 27. At this time, since the air outlet 27b of the duct 27 faces the gap 80a at a position adjacent to the gap 80a, the air that has flowed out of the air outlet 27b passes through the gap 80a and passes through the optical disk reading unit. 23 flows into the space inside. The air flowing into the space in the optical disc reading unit 23 is discharged to the outside of the main body case 20 through the gap 80b and the air discharge ports 42a and 42b.

  As a result, the air around the optical pickup 72 flows and the optical pickup 72 is cooled. The air inlet 41, the air outlets 42a and 42b, the gap 80a, the gap 80b, the fan 26, and the duct 27 are configured to cool the optical pickup 72 by the air flow generated by the fan 26. When driven, the fan 26 takes in and sends out air, distributes the air around the optical pickup 72, and cools the optical pickup 72.

  FIG. 4 shows an electrical block configuration of the optical disc playback apparatus 1. In addition to the above-described configuration, the optical disc playback apparatus 1 includes a control unit (fan drive control means) 29 that controls the operation of the optical disc playback apparatus 1. The control unit 29 is configured by the electronic component 25 mounted on the circuit board 24.

  The spindle motor 71 is rotationally driven under the control of the control unit 29 to rotate the optical disc 10. The optical pickup 72 projects light onto the optical disc 10 under the control of the control unit 29, receives the reflected light from the optical disc 10, and outputs a received light signal corresponding to the received light intensity. The seek motor 73 is rotationally driven under the control of the control unit 29 to move the optical pickup unit 72. The display unit 3 displays various images under the control of the control unit 29. The fan 26 is driven under the control of the control unit 29 to circulate the air around the optical pickup 72 and cool the optical pickup 72.

  The control unit 29 performs various operations of the optical disc playback apparatus 1 such as power supply from the battery pack 5 to each part of the optical disc playback apparatus 1, an operation of reading recorded data from the optical disc 10, and an operation of cooling the optical pickup 72 (driving the fan 26). Control the behavior.

  The operation of reading the recording data from the optical disc 10 is performed as follows under the control of the control unit 29. That is, the control unit 29 rotates the optical disc 10 by the spindle motor 71 and projects light from the light projecting / receiving unit 72 a of the optical pickup 72. Then, the control unit 29 analyzes the light reception signal output from the optical pickup 72 to display the recording data recorded on the optical disc 10 (address data indicating the position on the recording area of the optical disc 10 and an image). Image data and various data such as management data for managing the image data).

  At this time, the control unit 29 causes the seek motor 73 to pick up the optical pickup so that the reading position of the recording data on the optical disc 10 (the irradiation position on the optical disc 10 of the light projected from the optical pickup 72) becomes a desired position. 72 is moved.

  In addition, the control unit 29 controls the rotational drive of the spindle motor 71 so that the linear velocity of the optical disc 10 at the reading position of the recording data on the optical disc 10 becomes constant at a predetermined linear velocity. That is, the spindle motor 71 has a predetermined linear velocity of the optical disk 10 at a recording data reading position on the optical disk 10 under the control of the control unit 29 when the operation of reading the recording data from the optical disk 10 is performed. The optical disk 10 is rotated so that the linear velocity is obtained. The operation of reading recorded data from the optical disc 10 is performed in this way.

  The operation of cooling the optical pickup 72 is performed when the operation of reading recorded data from the optical disc 10 is being performed. The operation of cooling the optical pickup 72 is performed as follows under the control of the control unit 29. In other words, the control unit 29 drives the fan 26 and drives the fan 26 when the operation of reading the recording data from the optical disk 10 is being performed. When the situation is not, the drive of the fan 26 is stopped.

  Here, the predetermined situation in which the fan 26 should be driven is a situation where it is not sufficient to use the airflow generated by the rotation of the optical disc 10 to suppress the temperature rise of the optical pickup 72. In the embodiment, this is a situation in which the angular velocity of rotation of the optical disc 10 is slower than a predetermined angular velocity (for example, an angular velocity at which the rotation speed is 2000 rpm).

  In other words, the control unit 29 performs a predetermined operation to drive the fan 26 when the operation of reading the recording data from the optical disk 10 is in a situation where the angular velocity of rotation of the optical disk 10 is slower than the predetermined angular velocity. As the situation, the fan 26 is driven, and when the angular velocity of the rotation of the optical disk 10 is not slower than the predetermined angular velocity, the driving of the fan 26 is stopped assuming that the fan 26 is not in a predetermined situation.

  When the operation for reading the recording data is performed, the optical disc 10 rotates so that the linear velocity of the optical disc 10 at the recording data reading position is constant at a predetermined linear velocity. Therefore, the angular velocity of rotation of the optical disc 10 differs corresponding to the reading position of the recording data on the optical disc 10. When the reading position of the recording data is on the inner peripheral side of the optical disc 10, the angular velocity of rotation of the optical disc 10 is When the recording data reading position is fast and the outer peripheral side of the optical disk 10, the rotation speed of the optical disk 10 is low. For example, when the reading position of the recording data is on the innermost circumference side of the optical disc 10, the optical disc 10 rotates at an angular speed of a rotational speed of 5000 rpm, and the reading position of the recording data is on the outermost circumference side of the optical disc 10. In this case, the optical disk 10 rotates at an angular speed at which the rotational speed is 1100 rpm. Further, for example, when the reading position of the recording data is a position 2/3 from the innermost circumference side of the optical disc 10, the optical disc 10 rotates at an angular velocity at which the rotational speed is 2000 rpm.

  Since the reading position of the recording data on the optical disc 10 corresponds to the angular velocity of rotation of the optical disc 10 in this way, the predetermined situation in which the fan 26 in this embodiment should be driven is the angular velocity of rotation of the optical disc 10. This is a situation in which the angular velocity is lower than a predetermined angular velocity (angular velocity at which the rotational speed is 2000 rpm), and the recording data reading position on the optical disc 10 is a predetermined reading position (a position that is 2/3 from the innermost circumference side of the optical disc 10). ) On the outer peripheral side of the optical disc 10 than the above.

  Therefore, in the present embodiment, the control unit 29 detects the reading position of the recording data on the optical disc 10 based on the address data read from the light reception signal output from the optical pickup 72, and the recording on the optical disc 10 is performed. When the data reading position is on the outer peripheral side of the optical disc 10 with respect to the predetermined reading position, the fan 26 is driven so that the recording data reading position on the optical disc 10 is on the outer periphery of the optical disc 10 with respect to the predetermined reading position. When it is not the situation of the side, the driving of the fan 26 is stopped.

  The position of the optical pickup 72 corresponds to the reading position of the recording data on the optical disc 10. Accordingly, the predetermined situation in which the fan 26 is to be driven in the present embodiment corresponds to the position of the optical pickup 72 corresponding to the predetermined position (the recording data reading position is 2/3 from the innermost circumference side of the optical disc 10). It is also a situation that is farther from the spindle motor 72 than the position). That is, from another viewpoint, the control unit 29 detects the position of the optical pickup 72 based on the address data read from the light reception signal output from the optical pickup 72, and the position of the optical pickup 72 is predetermined. When the position of the optical pickup 72 is not far from the spindle motor 72 than the predetermined position, the fan 26 is driven. To stop. The operation of cooling the optical pickup 72 is performed in this way.

  FIG. 5 shows an experimental result of an experiment for verifying the effect of suppressing the temperature rise of the optical pickup 72 in the optical disc reproducing apparatus 1. For the optical disk reproducing apparatus 1 of the present invention, an experiment was conducted to verify the effect (cooling effect) of suppressing the temperature rise of the optical pickup 72. The experiment was conducted using the optical disc playback apparatus 1 of the present invention and the original optical disc playback apparatus (which is different from the optical disc playback apparatus 1 of the present invention and does not include the fan 26 and the duct 27). Assuming the situation of reading, the measurement was performed by measuring the temperature when the optical disk 10 was continuously rotated at a rotation speed of 1100 rpm for 3 hours. The original optical disc playback apparatus has the same configuration as the optical disc playback apparatus 1 of the present invention except that it does not include the fan 26 and the duct 27. For the optical disk reproducing apparatus 1 of the present invention, the temperature was measured when the fan 26 was driven at a voltage of 5 v, driven at a voltage of 6 v, and driven at a voltage of 7 v as the optical disk 10 was rotated. . The temperature is measured by (1) the first position inside the main body case 20 outside the optical disk reading unit 23 (the position of point A shown in FIG. 2B), and (2) the inside of the main body case 20. A second position outside the optical disk reading unit 23 (position B shown in FIG. 2B), (3) a position within the optical disk reading unit 23 inside the main body case 20 (shown in FIG. 2B). The measurement was performed at four positions, that is, the position of the point C) and (4) the position outside the main body case 20 (the position of the point D shown in FIG. 2B).

  The result of the experiment is as shown in FIG. In FIG. 5, “inside the set 1” means “the first position outside the optical disk reading unit 23 inside the main body case 20 (the position of the point A shown in FIG. 2B)” in (1) above. The “set interior 2” means “the second position outside the optical disk reading unit 23 inside the main body case 20 (the position of the point B shown in FIG. 2B)” in (2) above. “OPU surroundings” means “the position in the optical disk reading unit 23 inside the main body case 20 (the position of the point C shown in FIG. 2B)” in (3) above. Yes, “periphery of the set” means “position outside the main body case 20 (position of point D shown in FIG. 2B)” in (4) above. The “measured temperature” is a temperature measured in “inside the set 1”, “inside the set 2”, “around the OPU”, and “around the set”, and “Δt” means “inside the set 1” “inside the set 2”. It is the temperature difference between the temperature measured at “OPU ambient” and the temperature measured at “set ambient”.

  As a result of the experiment, in the original optical disc reproducing apparatus, the measured temperature is “73.6 ° C.” with respect to the temperature of “around the OPU”, and there is a temperature difference of only 7 ° C. and 1.4 ° C. in the guaranteed operating temperature. Therefore, the original optical disk reproducing apparatus cannot sufficiently obtain the effect of suppressing the temperature rise of the optical pickup 72. Further, in the original optical disk reproducing apparatus, there is a concern that the temperature around “OPU” exceeds the operation guarantee temperature in the specification due to the use environment or the like.

  On the other hand, when the fan 26 is driven at a voltage of 7v in the optical disk reproducing apparatus 1 of the present invention, the measured temperature is 45.0 degrees with respect to the temperature around the OPU, and the guaranteed operating temperature of 75. There is a temperature difference between 0 degrees and 30.0 degrees. Therefore, when the fan 26 is driven with a voltage of 7 v in the optical disk reproducing apparatus 1 of the present invention, the effect of suppressing the temperature rise of the optical pickup 72 is sufficiently obtained. Further, even when the fan 26 is driven with a voltage of 6v and when the fan 26 is driven with a voltage of 5v in the optical disc reproducing apparatus 1 of the present invention, the temperature around the “OPU” is sufficiently higher than the operation guaranteed temperature in the specification. There is a sufficient temperature difference, and the effect of suppressing the temperature rise of the optical pickup 72 is sufficiently obtained.

  According to the optical disc reproducing apparatus 1 of the present invention, when the angular velocity of rotation of the optical disc 10 is slower than the predetermined angular velocity (that is, in the predetermined situation, to suppress the temperature rise of the optical pickup 72, When it is not sufficient to use the airflow generated by the rotation of the optical disc 10), the fan 26 is driven, and the optical pickup 72 is cooled by the airflow generated by the fan 26. Further, when the angular velocity of the rotation of the optical disk 10 is not lower than the predetermined angular velocity (that is, when the optical disk 10 is not in the predetermined condition and the temperature of the optical pickup 72 is suppressed, an air flow generated by the rotation of the optical disk 10 is suppressed. When it is sufficient to use the optical pickup 72), the drive of the fan 26 is stopped, and the optical pickup 72 is cooled by the airflow generated by the rotation of the optical disc 10. Therefore, the temperature rise of the optical pickup 72 can be suppressed while suppressing the power consumption of the battery pack 5.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible. For example, when a sensor for detecting the number of rotations of the spindle motor or a sensor for detecting the angular speed of rotation of the spindle motor is provided, and the angular speed of rotation of the optical disk is slower than a predetermined angular speed based on the sensor output In addition, the fan may be driven and the driving of the fan may be stopped when the angular velocity of rotation of the optical disk is not slower than a predetermined angular velocity. In addition, a situation where the temperature of the air around the optical pickup is higher than a predetermined temperature may be set as the predetermined situation. That is, a temperature sensor that measures the temperature of the air around the optical pickup is provided, and the fan is operated when the temperature of the air around the optical pickup is higher than a predetermined temperature based on the output of the temperature sensor. And the fan driving may be stopped when the temperature of the air around the optical pickup is not higher than a predetermined temperature.

DESCRIPTION OF SYMBOLS 1 Optical disk reproducing apparatus 2 Main body unit 3 Display unit 4 Hinge unit 5 Battery pack 10 Optical disk 20 Main body case 21 Disk chamber 22 Disc cover 23 Optical disk reading unit 24 Circuit board 25 Electronic component 26 Fan 26a Air intake port 26b Air outlet 27 Duct 27a Air inlet 27b Air outlet 29 Control section (fan drive control means)
31 Lower case 31a Lower case front wall 31b, 31c Lower case side wall 32 Upper case 41 Air inlet 42a, 42b Air outlet 51 Disc chamber bottom wall 52 Disc chamber outer peripheral wall 61 Reading opening 71 Spindle motor 71a Disc Mounting portion 72 Optical pickup 72a Light emitting / receiving portion 73 Seek motor 74 Traverse chassis 74a Lower wall portion 74b, 74b, 74c, 74d of traverse chassis Peripheral wall portion of traverse chassis 75 Traverse cover 75a Cover opening 76 Bracket 77 Guide rail 78 Gear 79 Rack 80a , 80b clearance

Claims (6)

A spindle motor for rotating the optical disc, and an optical pickup that moves in a direction approaching and separating from the spindle motor, projects light onto the optical disc, and receives reflected light from the optical disc,
In an optical disk reproducing apparatus that rotates an optical disk by the spindle motor, projects light onto the optical disk by the optical pickup and receives reflected light from the optical disk, and reads recorded data from the optical disk.
A fan that takes in and sends out air by being driven, and circulates air around the optical pickup;
Fan drive control means for controlling the drive of the fan,
The fan drive control unit drives the fan when a recording data is read from the optical disk in a predetermined situation, and stops driving the fan when the situation is not a predetermined situation. ,
An optical disk reproducing apparatus characterized by the above. The predetermined situation is a situation where an angular velocity of rotation of the optical disc is slower than a predetermined angular velocity,
The fan drive control means drives the fan when the angular velocity of rotation of the optical disc is slower than a predetermined angular velocity, and when the angular velocity of rotation of the optical disc is not slower than a predetermined angular velocity, Stop driving the fan,
The optical disk reproducing apparatus according to claim 1, wherein: The spindle motor rotates the optical disc so that the linear velocity of the optical disc at the reading position of the recording data on the optical disc becomes a predetermined linear velocity when the operation of reading the recording data from the optical disc is performed.
The predetermined situation is a situation where the position of the optical pickup is farther from the spindle motor than the predetermined position,
The fan drive control means drives the fan when the position of the optical pickup is farther from the spindle motor than a predetermined position, and the position of the optical pickup is more than the predetermined position. Stop driving the fan when not away from the motor,
The optical disk reproducing apparatus according to claim 1, wherein: The spindle motor rotates the optical disc so that the linear velocity of the optical disc at the reading position of the recording data on the optical disc becomes a predetermined linear velocity when the operation of reading the recording data from the optical disc is performed.
The predetermined situation is a situation where the reading position of the recording data on the optical disc is on the outer peripheral side of the optical disc from the predetermined reading position,
The fan drive control means drives the fan when the reading position of the recording data on the optical disc is on the outer peripheral side of the optical disc from the predetermined reading position, and the reading position of the recording data on the optical disc is predetermined. The drive of the fan is stopped when the situation is not on the outer peripheral side of the optical disc from the reading position of
The optical disk reproducing apparatus according to claim 1, wherein: The predetermined situation is a situation where the temperature of the air around the optical pickup is higher than a predetermined temperature,
The fan drive control means drives the fan when the temperature of the air around the optical pickup is higher than a predetermined temperature, and the temperature of the air around the optical pickup is lower than the predetermined temperature. Stop driving the fan when the situation is not high,
The optical disk reproducing apparatus according to claim 1, wherein: A bracket provided on a circuit board;
A traverse chassis provided on the bracket and supporting the spindle motor and the optical pickup;
A duct for guiding the air sent out from the fan to the periphery of the optical pickup,
Between the bracket and the traverse chassis, a gap communicating with the space in which the optical pickup moves is provided,
The duct has an air inlet into which air sent from the fan flows in, and an air outlet through which air flows in from the air inlet, and the area of the air outlet is the air flow. Smaller than the area of the inlet, facing the gap between the bracket and the chassis,
The optical disk reproducing apparatus according to claim 1, wherein:

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