JPH06111339A - Disk player - Google Patents

Abstract

PURPOSE:To prevent a contact (interference) between a optical block and a disk at the time of inverting at the disk player where the upper and lower surfaces of the disk are recorded/reproduced by inverting the optical block provided with a pickup. CONSTITUTION:At a disk player 1, an optical block 5 provided with a pickup 4 is attached to the attaching reference surface 7a of an optical block supporting member 7 via an optical block guiding member 6. The optical block guiding member 6 is constituted of first and second guiding sections 31 and 32 for moving the optical block 5 along the upper and lower surfaces of a disk 3 whose one edge parts are connected and a third guiding section 33 for delivering and receiving the optical block 5. The first and second guiding sections 31 and 32 are formed spreading outward so they are gradually inclined toward an outside direction as they move from one edge part to the third guiding section 33 at the other edge side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports an optical block provided with a pickup by an optical block supporting member,
The present invention relates to a disc player in which recording / reproduction is performed by running the optical block along the recording surface of the disc.

[0002]

2. Description of the Related Art FIG. 1 shows an optical disc player.
As shown in FIG. 7, a pickup 102 for reproducing information on a disc 101 having information recorded on both the lower surface and the upper surface.
A pickup moving member 103 for moving the pickup 102, a linear first guide member 104 for guiding the pickup moving member 103 to radially move the lower surface of the disk 101, and the pickup 102.
A linear second guide member 105 for guiding the radial movement of the upper surface of the disk 101, both guide members 104,
There is known a disc player including a pair of left and right pickup guide members 107 and 108 including a U-shaped connecting member 106 that connects 105. (Japanese Patent Laid-Open No. 62-
287476).

By the way, in the above-mentioned conventional disc player, since the first and second guide members 104 and 105 of the pickup guide members 107 and 108 are formed in parallel, there are the following problems.

(1) Disk 101 on turntable
The outer peripheral portion of the disk tends to incline downward (about 2 °) due to distortion or the like due to its own weight. Therefore, after the recording / reproducing on the lower surface side of the disk 101 is completed, the pickup 102 is moved to U.
The pickup 102 is likely to come into contact with the outer peripheral portion of the disk 101 when the pickup 102 is fed to the character-shaped connecting member 106 side and inverted from the first guide member 104 side to the second guide member 105 side.

(2) In order to prevent the pickup 102 and the disc 101 from coming into contact with each other, the disc 10 of the first and second guide members 104 and 105 should be prevented from coming into contact with each other.
It suffices if the gap between the upper and lower surfaces of No. 1 is sufficiently large in advance, but this makes the disc player thicker.

In order to solve the above problems, the pickup guide members 107 and 108 are tilted up or down, so that the pickup 102 moves from the first guide member 104 to the second guide member 105. Alternatively, a so-called tilt type disc player has been developed which can be moved from the second guide member 105 to the first guide member 104 side.

FIG. 18 shows a drive control circuit 111 for tilting the pickup guide members 107 and 108 up or down in the tilt type disc player.

The drive control circuit 111 includes a tilt motor 112, a tilt motor drive circuit 113, a sled motor 114, a sled motor drive circuit 115, and a CPU 11.
6, tilt up detection switch 117, tilt down detection switch 118, sled A surface detection switch 119,
The thread A surface innermost circumference detection switch 120, the thread B surface detection switch 121, the thread B surface innermost circumference detection switch 122, and the thread outer circumference detection switch 123 are provided.

Then, as shown in the operation explanatory view of FIG. 19, when the A-plane play is completed, the tilt motor 112 is operated to tilt down the pickup guide members 107 and 108.

When the tilt-down detection switch 118 detects the tilt-down, the sled motor 1 is detected.
14 operates to move the pickup 102 from the inner peripheral side to the outer peripheral side of the A surface. When the pickup 102 comes to the outermost position and the sled outer circumference detection switch 123 detects it, the tilt motor 112 operates to tilt up the pickup guide members 107 and 108.

When the tilt-up is completed and the tilt-up detection switch 117 detects it, the sled motor 11 is moved.
4 operates to move the pickup 102 from the outermost peripheral position to the B surface side.

When the pickup 102 moves to the B side and the sled B side detection switch 121 detects it, the sled motor 114 moves the pickup 102 from the outer peripheral side to the inner peripheral side of the B side.

When the pickup 102 moves to the innermost position of the B surface, the sled B surface innermost detection switch 122 detects this and stops the pickup 102, and tilts down the pickup guide members 107 and 108. .

Then, B-side play is performed.

[0015]

By the way, the conventional tilt type disc player has the following problems.

(1) Tilt up / tilt down detection switches 117 and 118, sled A surface detection switch 11
9, a large number of position detection switches such as the sled A surface innermost circumference detection switch 120, the sled B surface detection switch 121, the sled B surface innermost circumference detection switch 122, and the sled outer circumference detection switch 123 must be used. In addition, the structure of the drive control device 111 becomes complicated. Moreover, since the number of parts used increases, the product cost also increases.

(2) It takes time to shift from A-side play to B-side play, or from B-side play to A-side play.

The present invention solves the above-mentioned conventional problems, reduces the number of position detecting switches used, and makes it possible to perform a transition between A-side play and B-side play in a shorter time. It was made for the purpose of providing a player.

[0019]

According to a first aspect of the present invention, there is provided an optical block provided with a pickup for reading information recorded on a disc, and an optical block guide for moving the optical block along the disc on a turntable. In a disc player including a member and an optical block support member having the optical block guide member mounted on a mounting reference surface, a first guide portion for moving the optical block guide member along the lower surface of the disc. When,
The second guide portion for moving the optical block along the upper surface of the disc is connected to one end portions of the first and second guide portions, and the pickup is delivered between the first and second guide portions. In addition to being composed of a third guide portion, the first and second guide portions are formed in an outwardly widening shape that gradually inclines outward from the one end side toward the third guide portion side on the other end side.

According to a second aspect of the present invention, in the disc player according to the first aspect, the optical block guide member is held at a neutral position in which the first guide portion and the second guide portion are separated from the upper and lower surfaces of the disc at equal intervals. I was able to do it.

[0021]

According to the disc player of the first aspect, the inclination of the optical block guide member, especially the inclination of the first guide portion is
The inclination of the disc mounted on the turntable is compensated, and the distance between the lower surface of the disc and the first guide portion is kept constant.

According to the disc player of claim 2,
By holding the optical block guide member in the neutral position, the distance between the first and second guide portions of the optical block guide member and the upper and lower surfaces of the disk placed on the turntable is set so that the optical block moves to the disk. It is kept at a distance that can be inverted without touching.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to FIGS.

1 to 4, reference numeral 1 denotes a disc player of the present invention.

The disc player 1 is an optical block 5 provided with a pickup 4 for reproducing information recorded on a disc 3 placed on a turntable 2.
An optical block guide member 6 for moving the optical block 5 along the surfaces A and B (lower surface, upper surface) of the disk 3, and an optical block mounting reference surface (hereinafter, simply mounted). (Referred to as a reference surface) 7a, and the attached reference surface 5a of the optical block 5
By contacting the mounting reference surface 7a with the optical block supporting member 7 supporting the optical block 5 in a cantilevered manner in a state in which the optical block 5 is prevented from tilting.

As shown in FIG. 5, the optical block 5 includes a base plate 12 having a pickup 4 and a tilt sensor 11, a cover plate 13 mounted on the base plate 12, and one side of the base plate 13. And a side plate 14 attached to the section.

Protrusions 15 and 16 are provided on the upper and lower ends of the outer surface of the side plate 14, and these protrusions 1
The front end surfaces of the reference numerals 5 and 16 are the attached reference surface 5a.

The side plate 14 has a pinion fitting hole 17.

A pinion mounting shaft 18 is provided below the projection 15 so as to face the center of the pinion fitting hole 17, and a pinion 19 is rotatably mounted on the pinion mounting shaft 18.

The pinion 19 projects to the outer surface side of the side plate 14 through the pinion fitting hole 17, and the optical block guide member 6 described in detail later.
Of the rack 34.

The pinion 19 is rotated by a feed motor 21 via a rotation transmission gear group 20.

On the outer surface of the side plate 14, as shown in FIGS. 6 to 7, the first to third guide rollers 22 are arranged along the moving direction of the optical block 5. , 23, 24 are arranged in a row.

The above-mentioned first to third guide rollers 22 to 24
Is fitted into the guide roller insertion groove 35 of the optical block guide member 6 which will be described in detail later.

The above three guide rollers 22, 23, 24
The second guide roller 23 at the center of the two and the first and third guide rollers 22 and 24 on both sides thereof are vertically offset.

The above first to third guide rollers 22 to 24
Are attached to the optical block 5 so as to form a width W1.

Further, the first running rollers 25 ... 25 are attached to the attached reference surface 5a at the tips of the protrusions 15 and 16, and the second roller is attached to the central portion of one of the protrusions 16.
A roller 26 for traveling is attached.

Next, the optical block guide member 6 for moving the optical block 5 along the disk 3 will be described.

As shown in FIG. 9, the optical block guide member 6 has a first guide portion 31 for moving the optical block 5 along the A surface (lower surface) of the disk 3 and the B surface (upper surface) of the disk 3. ) Along with the second guide portion 32 for moving the optical block 5, and the first and second guide portions 31, 3 described above.
The first guide portion 31 connects the two end portions of the second guide portion 31 and is formed in a substantially U-shape between the first and second guide portions 31 and 32 by the third guide portion 33 that delivers the optical block 5. The first and second guide portions 31 and 32 are formed in an outwardly widened shape that gradually inclines outward from the one end side (free end side) toward the third guide portion 33 side on the other end side.

The divergence angle of the first and second guide portions 31 and 32 is set to about 2 ° in accordance with the inclination angle (maximum about 2 °) which is generated in the outer peripheral portion of the disk 2 due to distortion due to its own weight or the like. ing.

However, when the optical block guide member 6 is supported at the neutral position by the rotating cam 66 described later, the first and second guide portions 31 and 32 are respectively 2 ° vertically with the disk 3 as the center. Even if the outer peripheral portion of the disc 2 is inclined downward at an inclination angle of 2 ° due to distortion due to its own weight, the first guide portion 31 is in parallel with the disc 3 The optical block 5 can be turned over to the second guide portion 32 side without holding the optical block 5 in contact with the disk 3.

A rack 34 that meshes with the pinion 19 provided on the optical block 5 is formed on the inner peripheral surface of the optical block guide member 6, and one side surface is provided with a rack 34 provided on the optical block 5. Individual guide rollers 22, 2
A guide roller insertion groove 35 into which the parts 3 and 24 are fitted is formed.

As shown in FIG. 11, the guide roller insertion groove 35 has linear first and second groove portions 36 and 37 provided in the first and second guide portions 31 and 32, and a third guide portion. It is composed of an arc-shaped third groove portion 38 provided in the portion 33.

The width W2 of the linear first and second groove portions 36, 37 is substantially equal to the mounting width W1 of the first to third guide rollers 22-24.

Then, the above-mentioned first to third guide rollers 2
When 2 to 24 are inserted into the first and second groove portions 36 and 37, the first and third guide rollers 22 and 24 contact one side surface of the first and second groove portions 36 and 37, The second guide roller 23 comes into contact with the other side surfaces of the first and second groove portions 36 and 37 so that the optical block 5 can be moved smoothly without rattling.

Further, the width W3 of the arc-shaped third groove portion 38
Is formed larger than the mounting width W1 of the first to third guide rollers 22 to 24, and the third groove portion 38 is formed.
When the optical block 5 moves, the above-mentioned first and second
Similar to the case of moving the groove portions 36 and 37, the first and third guide rollers 22 and 24 are in contact with one side surface of the third groove portion 38, and the second guide roller 23 is the other end surface of the third groove portion 38. The optical block 5 that comes into contact with the
Can be moved.

First and third guide rollers 22, 24,
The reason why the second guide roller 23 is offset is that, as described above, the first to third guide rollers 22 to 24 move in the third groove portion 38 wider than the first and second groove portions 36 and 37. At this time, the first and third guide rollers 22 and 24 and the second guide roller 23 are brought into contact with one side surface and the other end surface of the third groove portion 38, respectively, and the third groove portion 38 is also smooth without rattling. This is for moving the optical block.

On the other side surface of the optical block guide member 6 (the surface opposite to the surface on which the guide roller insertion groove 35 is formed), as shown in FIG. 9, the optical block guide member 6 is provided with an optical block. First to seventh tilting pins 40 to 46 for mounting on the mounting reference surface 7a of the support member 7 are provided.

The first to third pins 40 to 42 are in the first guide portion 31, the fourth and fifth pins 43 and 44 are in the second guide portion 32, and the sixth and seventh pins 45 and 46. Are provided in the third guide portion 33, respectively.

The tips of the first to sixth pins 40 to 45 are divided by a diametrical slit 47, as shown in FIG.

By utilizing the slit 47, the diameters of the first to sixth pins 40 to 45 can be reduced.

Further, locking claw pieces 48 for locking the coil spring restraining member are formed on the outer peripheries of the tip ends of the first to sixth pins 40 to 45.

Then, the above-mentioned first to seventh pins 40 to 46
The optical block mounting reference surface 7 of the optical block support member 7
After being inserted into the first to seventh pin fitting holes 50 to 56 provided in a, the washer 57, the coil spring 58, and the tubular spring restraining member 59 are attached to the tips of the first to sixth pins 40 to 45. And the coil spring 58 is compressed by the spring restraining member 59, the locked portion 60 at the tip of the spring restraining member 59 is provided at the tip of the first to sixth pins 40 to 45. The optical block guide member 6 is attached to the optical block attachment reference surface 7 a of the optical block support member 7 by engaging with the locking piece 48 for locking the coil spring restraining member.

Here, a method of assembling the optical block 5 to the optical block guide member 6 will be described.

As shown in FIG. 6, one end surface of the optical block guide member 6, more specifically, one end surface side of the second groove portion 37,
The first to third guide rollers 22 to 24 are inserted into the guide roller insertion groove 35, and the first and second traveling rollers 25 and 26 provided on the protrusion 15 are attached to the optical block guide member. 6 and the optical block mounting reference surface 7a of the optical block support member 7 to be inserted into a gap 39.

The above first to third guide rollers 22 to 24
Is inserted into the guide roller insertion groove 35, and the first and second traveling rollers 25 and 26 are inserted into the gap 39,
As shown in FIG. 8, the second protrusion provided on the one protrusion 16
Part of the optical block guide member 6 is sandwiched between the traveling roller 26 and the guide rollers 22 to 24.

The first traveling rollers 25 ... 25 provided on the protrusions 15 and 16 come into contact with the optical block mounting reference surface 7a of the optical block support member 7 and the second traveling rollers provided on one of the protrusions 16. The roller 26 for contact comes into contact with the second traveling roller contact surface 27 provided on the optical block guide member 6. The pinion 19 meshes with the rack 34.

In this way, the optical block guide member 6
The optical block 5 assembled to the optical block supporting member 7 is attached to the optical block supporting member 7 via the optical block guide member 6 by the spring force (extension force) of the coil spring 58 attached to the first to sixth pins 40 to 45. Is pulled toward the attachment reference surface 7a side.

The attached reference surface 5a of the optical block 5 is pressure-bonded to the attached reference surface 7a so that the optical block 5 is cantilevered by the optical block support member 7.

Next, the optical block support member 7 will be described.

The optical block support member 7 is formed into a substantially U-shaped front face, like the optical block guide member 6 described above.
The optical block mounting reference surface 7a provided on one side of the base plate (chassis) 62 is erected on the base plate (chassis) 62 so as to be vertical.

The first to sixth pins 40 provided on the optical block guide member 6 on the optical block mounting reference surface 7a.
To the positions corresponding to 46 to the first to seventh pin fitting holes 50.
~ 56 are formed.

The first to seventh pin fitting holes 50 to 56
As shown in FIG. 9, is formed in a long hole shape extending in the tangential direction of a circle having a virtual center at the substantially central portion of the recording surface of the disk 3 mounted on the turntable 2.

A rotary cam 66 for tilting the optical block guide member 6 is provided at a position corresponding to the seventh pin fitting hole 56 on the back side of the optical block mounting reference surface 7a.

The rotary cam 66 is rotated by a tilt motor 69 via a worm wheel 67 and a worm 68.

A cam groove 71 for inserting a pin is formed on one side surface of the rotary cam 66, and the tip of the seventh pin 46 is inserted into the cam groove 71.

The cam groove 71 is formed in a spiral shape of about 360 ° about the rotary shaft 65.

When the tip of the seventh pin 46 is located at the center of the cam groove 71 (position approximately 180 ° from both ends), the optical block guide member 6 is moved to the neutral position ( The first guide portion 31 and the second guide portion 32 are held at a neutral position (equal distance from the disk 3).

When the rotary cam 66 is rotated in one direction from the state where the optical block guide member 6 is in the neutral position, the optical block guide member 6 moves up and the first guide portion 31 approaches the disc 3. , The second guide portion 32 moves in a direction away from the disc 3.

When the rotary cam 66 is rotated in the other direction from the neutral state, the optical block guide member 6 descends, the first guide portion 31 separates from the disk 3, and the second guide portion 32 moves to the disk 3. Move toward you.

The outer peripheral surface of the rotary cam 66 is shown in FIG.
As shown in FIG. 13, first and second cam projections 72 and 73 for tilt position detection are formed in parallel in the axial direction. Then, the cam projections 72 and 73 turn on and off the first and second tilt position detection switches 74 and 75 arranged below the rotary cam 66 to change the tilt state of the optical block guide member 6. It is designed to detect.

The first cam projection 72 has the rotary cam 66.
Is formed on the outer peripheral surface of about 180 °, that is, over about half the circumference.

Further, the second cam projection 73 is provided on one end side of the first cam projection 72 over a range of about 40 ° so as to partially overlap with the first cam projection 72. Is formed.

The tip of the seventh pin 46 has a cam groove 71.
When the optical block guide member 6 is at the neutral position, the one end side of the first cam projection 72 is at the position of the first tilt position detection switch 74.

When the rotary cam 66 rotates clockwise, the engagement between the first cam projection 72 and the first tilt position detection switch 74 is released, and the first tilt position detection switch 74 is turned off. The optical block guide member 6 is tilted upward while being kept at.

When the rotary cam 66 rotates about 160 °, the second tilt position detecting switch 75 is turned on by the second cam projection 73, and the tilt upper limit is detected.

When the rotating cam 66 rotates counterclockwise from the neutral position, the first tilt position detection switch 74 is turned on by the first cam protrusion 72, and the first tilt position detection switch 74 is turned on. While keeping the state, the optical block guide member 6 is tilted downward.

When the rotary cam 66 rotates about 160 °, the second tilt position detection switch 75 is also turned on by the second cam projection 73, and the tilt lower limit is detected.

Further, when the optical block 5 is reversed, the optical block guide member 6 is automatically returned to the neutral position by the rotary cam 66.

FIG. 15 shows the drive control circuit 81 of the disc player.

The drive control circuit 81 includes the tilt motor 69, the tilt motor drive circuit 82, the sled motor 83, the sled motor drive circuit 84, and the CPU 85.
And the first and second tilt position detection switches 74, 7 described above.
5, a sled A surface innermost circumference detection switch 86, and a second sled B surface innermost circumference detection switch.

Then, as shown in the operation explanatory view of FIG. 16, the optical block guide member 6 is tilted up so that the first guide portion 31 of the optical block guide member 6 is parallel to the disc 3. By moving the pickup 4 from the innermost position of the A surface toward the outer peripheral side,
Perform face play.

After the play on the A side is completed, the optical block guide member 6 is returned to the neutral position.

When the optical block guide member 6 is returned to the neutral position, the pickup 4 moves from the A surface side to the B surface side.

When the pickup 4 reaches the innermost position of the B surface, the optical block guide member 6 is tilted down, the second guide portion 32 becomes parallel to the disk 3, and the B surface of the disk 3 is played. Is done.

The drive control circuit 81 of the embodiment has the above-mentioned configuration and has the conventional drive control circuit 1 shown in FIG.
The sled A surface detection switch, the sled B surface detection switch, and the sled outer circumference detection switch, which are the 11 essential components, are unnecessary, and the structure of the drive control circuit 81 can be simplified accordingly.

Further, the transition from the A-side play to the B-side play or the transition from the B-side play to the A-side play can be performed quickly in a short time.

When the tilt sensor 11 detects the tilt of the disk 3 during the play, the tilting motor 69 rotates the rotary cam 66 to cause the disk 3 to move.
The optical block guide member 6 is tilted upward or downward in accordance with the tilt of the optical disc so that the optical axis of the objective lens of the pickup 5 and the light reflection surface of the disc 3 are perpendicular to each other, and the laser light is always directed to the disc 3. Hit it at a right angle.

[0088]

The disc player of the present invention has the following effects.

(1) The first and second guide portions are inclined outwardly so that the gap between the disc and the optical block widens as the optical block moves from the inner peripheral side to the outer peripheral side of the disc. Therefore, even when the outer peripheral portion of the disc is inclined due to distortion due to its own weight, the inclination can be absorbed and the optical block can be smoothly inverted without contact (interference) between the disc and the optical block. It will be possible.

(2) By setting the optical block guide member to the neutral position, it is possible to prevent the disc from contacting the optical block when the disc is tilted upward or downward, and to reliably reverse the optical block. Will be possible.

(3) The configuration of the drive control circuit can be simplified by eliminating the thread A surface detection switch, the thread B surface detection switch, the thread outer circumference detection switch and the like. Further, it is possible to quickly shift the A side play to the B side play or the B side play to the A side play.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part.

FIG. 2 is a front view of a main part.

FIG. 3 is a side view of a main part.

FIG. 4 is a plan view of a main part.

FIG. 5 is an exploded perspective view of an optical block.

FIG. 6 is a perspective view of an optical block.

FIG. 7 is a front view of an optical block.

FIG. 8 is a side view of an optical block.

FIG. 9 is an exploded perspective view of a main part.

FIG. 10 is a cross-sectional view showing a mounted state of a tilt pin.

FIG. 11 is a front view of an optical block guide member.

FIG. 12 is a front view of a rotating cam.

FIG. 13 is a side view of a rotating cam.

FIG. 14 is an explanatory diagram showing a relationship between on / off of a tilt position detection switch and a tilt position.

FIG. 15 is a block diagram of a drive control circuit.

FIG. 16 is an operation explanatory diagram.

FIG. 17 is a perspective view of a conventional disc player.

FIG. 18 is a block diagram of a conventional drive control circuit.

FIG. 19 is a diagram for explaining a conventional operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Disc player 2 ... Turntable 3 ... Disc 4 ... Pickup 5 ... Optical block 5a ... Attachment reference surface 6 ... Optical block guide member 7 ... Optical block support member 7a ... Optical block attachment reference surface 31 ... First guide portion 32 ... 2nd guide part 33 ... 3rd guide part

Claims (2)

[Claims] 1. An optical block provided with a pickup for reading information recorded on a disc, an optical block guide member for moving the optical block along the disc on a turntable, and a mounting reference for the optical block guide member. An optical block support member attached to the surface, wherein the optical block guide member moves the optical block along a lower surface of the disc, and a first guide portion for moving the optical block along the upper surface of the disc. The second guide portion is connected to one end portion of the first and second guide portions, and the third guide portion transfers the optical block between the first and second guide portions. The first and second guide portions are formed in an outwardly widened shape that gradually inclines outward from one end side toward the third guide portion side at the other end side. Disc player, characterized by that. 2. The disc player according to claim 1,
The optical block guide member is a disc player in which the first and second guide portions are held in a neutral position in which the first and second guide portions are separated from the upper and lower surfaces of the disc on the turntable at equal intervals.