JPH0749666Y2 - Disc player - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is directed to a disc on which information is recorded, for example, a CD.
The present invention relates to a disc player in which a pickup unit having an optical pickup for reproducing information from a disc such as a (compact disc) or a VD (video disc) is moved in the radial direction of the disc by a feed screw.

[Prior Art] FIG. 3 is a perspective view showing a main part of a conventional CD player, and FIG. 4 is an explanatory view for explaining the operation.

In FIGS. 3 and 4, 1 is a chassis, 2 is a feed motor attached to the chassis 1, and 3 is a first pulley attached to the rotating shaft of the feed motor 2.

4 is a support member 5A, 5B attached to the chassis 1 at both end portions 4
Shows the feed screw supporting a, 4b, both ends 4a, 4b
Has a small diameter, the central portion 4c has a large diameter, and a male screw portion 4c ₁ is formed on the peripheral surface of the central portion 4c.

6 is a second screw attached to one end portion 4a of the feed screw 4.
, 7 is a belt stretched around the first and second pulleys 3 and 6.

Reference numeral 8 denotes a spindle motor attached to the chassis 1, and 9A and 9B denote a pair of guide bars attached to the chassis 1. The guide bars 9A and 9B are parallel to the feed screw 4.

Reference numeral 10 denotes a pickup unit having an optical pickup, which is guided by guide bars 9A and 9B which penetrate a part thereof.

Reference numeral 11 denotes a rubber member as a cushioning material, which is a surface orthogonal to the moving direction of the pickup unit 10, and is a spindle motor 8
It is attached to the surface far from.

12 shows the rack, in a direction perpendicular to the axial direction of the screw 4 feeding through the shaft 13 to the pickup unit 10, mounted pivotably, is internally threaded portion 12a which engages with the external thread portion 4c ₁ of the feed screw 4 Has been formed.

Reference numeral 14 denotes a torsion spring loaded on the shaft 13, and the male screw portion 4c ₁ of the feed screw 4 is connected to the female screw portion 12a of the rack 12.
Is urged to engage (screw).

Reference numeral 15 denotes a transportation screw that restricts the movement range of the pickup unit 10 during transportation, and the pickup unit is transported during transportation.
After the 10 is located at the home position (the position where the pickup unit 10 is brought close to the spindle motor 8), the screw part is screwed into the chassis 1 to be attached, so that a part of the rubber member 11 and the rubber member 11 have a predetermined gap. Opposing.

Next, the operation will be described.

First, after positioning the pickup unit 10 at the home position before transportation, as shown by the chain double-dashed line in FIG.
When the shipping screw 15 is attached to the chassis 1, the shipping screw 15
15 is opposed to the rubber member 11 at a predetermined interval.

When the CD player receives an impact that cancels the urging force of the torsion spring 14 while the transportation screw 15 is attached, the male screw portion 4c ₁ of the feed screw 4 and the female screw of the rack 12 are The screwing with the portion 12a is released, and the pickup unit 10 moves while being guided by the guide bars 9A and 9B.

However, the pickup unit 10 is the spindle motor 8
When moving in a direction away from (direction with a large movement range), the pickup unit 10 abuts the transportation screw 15 via the rubber member 11 and stops.

Therefore, the movement range of the pickup unit 10 can be restricted by the transportation screw 15, so that the optical pickup can be prevented from being damaged by the pickup unit 10 colliding with the chassis 1 or the like at a high speed.

Next, by removing the transportation screw 15 before use, the restriction on the movement range of the pickup unit 10 can be released, as shown in FIG.

When the feed motor 2 rotates with the transportation screw 15 thus removed, the feed screw 4 rotates via the first pulley 3, the belt 7, and the second pulley 6, so that the male screw portion 4c of the feed screw 4 is rotated. ₁ , the rack 12 in which the female screw portion 12a is screwed by the urging force of the torsion spring 14 is attached to the feed screw 4
Since it moves in the axial direction of, the pickup unit 10 also moves along the guide bars 9A and 9B.

Therefore, by rotating the feed motor 2 and moving the pickup unit 10 in the radial direction of the CD, the information recorded on the CD can be read by the optical pickup.

Then, continues to rotate the feed motor 2, as shown in the fourth two-dot chain line in FIG., The pickup unit 10 in a state where the internal thread portion 12a of the rack 12 the feed is screwed to the male thread portion 4c ₁ of the screw 4 is Chassis When it abuts against 1, the rack 12 rotates against the biasing force of the torsion spring 14, and the screwing of the female screw portion 12a with the male screw portion 4c ₁ is released, so that the rack 12 is not damaged.

[Problems to be solved by the device]

Since the conventional disc player is configured as described above, the transportation screw 15 is required to prevent the pickup unit 10 from being damaged during transportation, the cost is increased, and the transportation screw 15 is attached. There was the inconvenience of having to perform work and removal work.

The present invention has been made in order to eliminate the above-described inconvenience, and it is inexpensive and has a simple structure in which the pickup unit moves due to an impact during transportation to collide with other members to be damaged. The present invention provides a disc player that can be prevented by.

[Means for Solving the Problems]

The disc player according to the present invention rotatably supports both left and right ends, forms a small diameter portion having a predetermined width at each of the left and right ends, and forms a large diameter portion at a central portion connected to the small diameter portion. A feed screw having a male screw portion formed on the entire circumferential surface of the diameter portion, a pair of guide bars that are attached in parallel with the feed screw and guide the pickup unit having an optical pickup, and the side surface has a U-shape. Female threaded portions to be screwed into the male threaded portions of the feed screw are formed inside the opposing first and second portions of the U-shaped portion, respectively, and are rotatable in a direction orthogonal to the axial direction of the feed screw. And a rack attached to the pickup unit so that the female screw portion on the one side is wider than the small diameter portion formed on the left and right ends of the feed screw, and Internal thread portion of the are in which the rack has said feed is formed in the large diameter portion of the threaded male screw portion screwed with no thread width of that when located in the small-diameter portion of the right and left ends of the feed screw.

[Action]

In the disc player according to the present invention, even if an impact is applied in the state where each female screw portion of the rack is screwed to the male screw portion of the feed screw, the screwing to the feed screw of the rack is not released, and the pickup unit does not move. .

Also, if the feed screw continues to rotate, one female screw part of the rack will not engage with the male screw part of the feed screw, so even if the pickup unit abuts the chassis, the rack will move in the direction orthogonal to the moving direction. Since it rotates, the rack is not damaged.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an essential part of a CD player according to an embodiment of the present invention, and FIG. 2 is an explanatory view for explaining the operation. The same parts as those in FIGS. 3 and 4 are designated by the same reference numerals. Is attached.

In FIG. 1 and FIG. 2, reference numeral 21 denotes a rack having a U-shaped side surface, and opposing first and second portions 21a and 21b.
Female screw portions 21a ₁ and 21a ₁ which are respectively screwed into the male screw portion 4c ₁ of the feed screw 4 are formed inside.

The sizes of the first portion 21a and the second portion 21b are such that the rack 21 moves and _one end of the male screw portion 4c ₁ of the feed screw 4 and _one of the male screw portions 21a ₁ are moved as shown in FIG. The female screw portion 21b ₁ is in a relationship such that it does not screw with the male screw portion 4c ₁ when the portions are screwed together.

Further, the rack 21 is attached to the pickup unit 10 by a shaft 13 so as to be rotatable in a direction orthogonal to the axial direction of the feed screw 4.

Next, the operation will be described.

First, as shown by the solid line in FIG.
The racks 21 do not move in the axial direction of the feed screw 4 even if a shock is applied to the CD player during transportation by setting 21a ₁ and 21b ₁ to be screwed into the male screw portion 4c ₁ of the feed screw 4.

Further, as shown by the chain double-dashed line in FIG. 2, in a state where the female screw portion 21a ₁ of the rack 21 is screwed into the male screw portion 4c ₁ of the feed screw 4, even if a shock is applied to the CD player during transportation, the rack 21
Moves only until the female screw portion 21b ₁ is screwed into the male screw portion 4c ₁ of the feed screw 4.

Therefore, during transportation, the movement range of the pickup unit 10 can be regulated even if a shock is applied to the CD player.
It is possible to prevent the pickup unit 10 from being damaged.

Next, at the time of use, the pickup unit 10 is moved to the CD by rotating the feed motor 2 as in the conventional example described above.
Can be moved in the radial direction.

Then, the feed motor 2 continues to rotate, and as shown by the chain double-dashed line in FIG. 2, the pickup unit 10 is operated while the female screw portion 21a ₁ of the rack 21 is screwed into the male screw portion 4c ₁ of the feed screw 4. When abutting against the chassis 1, the rack 21 rotates around the shaft 13 and the screw engagement of the female screw portion 21a _{1 with} the male screw portion 4c ₁ is released, so that the rack 21 is not damaged.

As described above, according to this embodiment, the pickup unit 10 does not move even when a shock is applied while the female screw portions 21a ₁ and 21b _{1 of} the rack 21 are screwed into the male screw portion 4c ₁ of the feed screw 4. It is possible to prevent the pickup unit 10 from being damaged.

Therefore, it is possible to prevent the pickup unit 10 from colliding with other members and being damaged by the movement of the pickup unit 10 due to an impact during transportation with an inexpensive and simple structure.

In the above embodiments, the CD player has been described as an example, but it goes without saying that it may be an on-vehicle CD player, an LD player, or the like.

[Effect of device]

As described above, according to the present invention, the left and right ends are rotatably supported, the small diameter portions having a predetermined width are formed at the left and right ends, and the central portion connected to the small diameter portions has the large diameter portion. That is, the feed screw having a male screw portion formed on the entire peripheral surface of the large diameter portion, a pair of guide bars attached in parallel with the feed screw and for guiding a pickup unit having an optical pickup, and a side shape of the feed bar. The U-shaped portion has female screw portions formed inside the opposing first and second portions of the U-shaped portion that are screwed into the male screw portions of the feed screw, and is orthogonal to the axial direction of the feed screw. A rack attached to the pickup unit so as to be rotatable in a direction, and the female screw portion on the one side is made wider than the narrow diameter portion formed on both left and right ends of the feed screw. Along with Since the female screw portion on the other side has a screw width that does not engage with the male screw portion formed on the large diameter portion of the feed screw when the rack is located on the left and right small diameter portions of the feed screw. , Even if a shock is applied with the two female screw parts of the rack screwed into the male screw part of the feed screw,
The pickup unit will not move.

Therefore, it is possible to prevent the pickup unit from moving due to impact during transport and colliding with other members to be damaged by an inexpensive and simple mechanism.

Also, when the pickup is moved to the left and right ends of the feed screw, the rack rotates in a direction orthogonal to the moving direction of the feed screw in the small-diameter portions formed at the left and right ends of the feed screw,
Even if the feed screw is rotated further, the rack and feed screw threads are crushed and damaged, or the pickup is pressed against the chassis and damaged. It is possible to prevent such a thing.

[Brief description of drawings]

FIG. 1 is a perspective view showing an essential part of a CD player according to an embodiment of the present invention, FIG. 2 is an explanatory view for explaining the operation of the embodiment of the present invention, and FIG. 3 is a conventional CD player. FIG. 4 is a perspective view showing the main part, and FIG. 4 is an explanatory view for explaining the operation of the conventional example. 2 ... Feed motor, 4 ... Feed screw, 4a ... One end part,
4b …… Other end part, 4c …… Center part, 4c ₁ …… Male screw part, 5
A, 5B …… Supporting member, 9A, 9B …… Guide bar, 10 …… Pickup unit, 13 …… Axis, 21 …… Rack, 21a ……
1st part, 21b ...... 2nd part, 21a ₁ , 21b ₁ ... Female screw part.

Front page continued (72) Inventor Kazuo Kobayashi 25-1 Nishimachi, Yamada, Kawagoe, Saitama Prefecture Pioneer Co., Ltd. Kawagoe factory (72) Inventor Yoshinori Yamada 25-1 Nishimachi, Kawagoe, Saitama Prefecture 1 Pioneer Kawagoe Factory Co., Ltd. (72) Inventor Kiyoshi Morikawa 25 Nishimachi, Yamada, Kawagoe City, Saitama 1 Pioneer Co., Ltd. Kawagoe Factory (56) Bibliography 1-109858 (JP, U) -26981 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A large-diameter portion is formed by rotatably supporting the left-right ends, forming a small-diameter portion having a predetermined width at the left-right ends, and forming a central portion connected to the small-diameter portion as a large-diameter portion. A feed screw having a male screw formed on the entire circumferential surface of the, a pair of guide bars that are attached in parallel with the feed screw and guide the pickup unit having an optical pickup, and the side shape is U-shaped. Female threaded portions to be screwed into the male threaded portions of the feed screw are formed inside the facing first and second portions of the character-shaped portion, respectively, and are rotatable in a direction orthogonal to the axial direction of the feed screw. And a rack attached to the pickup unit as described above, wherein the female screw portion on the one side is wider than the small-diameter portions formed on the left and right ends of the feed screw, and on the other side. The female screw part is A disc player characterized in that the rack has a screw width that does not engage with the male screw portion formed in the large diameter portion of the feed screw when the rack is positioned at the small diameter portions at the left and right ends of the feed screw. .