JPH0810885Y2 - Pickup feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pickup device for optical and magnetic pickups in a disc player such as a compact disc or a floppy disc.

[Summary of the Invention] The present invention is, in a pickup feeding device, a transfer body on which a pickup for reading at least information on a disc is mounted, a slide guide shaft arranged in a moving direction of the transfer body, and a slide body. A feed screw provided parallel to the guide shaft is provided, and the transfer body has a slide guide portion that is inserted into the slide guide shaft on one side and a feed screw that elastically clamps the feed screw from above and below on the other side. Since the guide portion is provided and slidably supported by the slide guide shaft and the feed screw, the feed screw has a function as the slide guide shaft, and one slide guide shaft is provided to reduce the number of parts. With a reduced structure, a simple structure prevents rattling due to backlash, etc., allowing the pickup to move smoothly with a low load. In addition, the weight and size of the entire device can be reduced.

[Prior Art] Conventionally, for example, in a disc player for reproducing a compact disc (CD), an optical pickup is brought close to a pit surface (reflection surface) on which a digital signal of the compact disc is recorded, and the optical disc is moved in a radial direction of the compact disc. It moves linearly to read the information on the compact disc. As a pickup feeding device for linearly moving such a pickup,
For example, one using a rack and pinion gear and one using a feed screw are known. Referring to FIG. 6, a pickup feeding device of the disc player using a rack and a pinion will be described. Reference numeral 30 is an optical pickup for reading information from a compact disc (not shown). A transfer body 31 moving in the radial direction of the compact disc is supported by a pair of parallel metal rod-shaped slide guide shafts 32, 32, and a rack is mounted on the transfer body 31 for sliding operation of the transfer body 31. 33 is mounted, and the pinion 34 meshing with the rack 33 is rotated by a drive motor or the like (not shown) to move the transfer body 31 into a pair of slide guide shafts 32, 3
It is designed to slide along 2.

In addition, referring to FIG. 7, a pickup device for a disc player using a feed screw will be described. As with the pickup device for a pickup using a rack and a pinion, a pair of transfer bodies 31 on which an optical pickup 30 is mounted are arranged. Through slide support shafts 32, 32 that are parallel to each other, and a half nut 35 is attached to the transfer body 31 so as to project so that the transfer body 31 can be slid, and the half nut 35 meshes with the half nut 35. By rotating a rod-shaped feed screw 36 parallel to the slide guide shaft 32 with a drive motor or the like not shown, the transfer body 31 is moved to a pair of slide guide shafts.
The optical pickup 30 is slid along 32 and 32 so as to move in the radial direction of the compact disc.

[Problems to be Solved by the Invention] However, in the conventional pickup feeder, both the rack and pinion type and the feed screw type are used as a pair of metal rod-shaped slide guide shafts 32, Since 32 is required, the weight of the entire feeding device becomes heavy, and it is not possible to reduce the weight and size of the disc player that has been recently demanded. Further, the pair of slide guide shafts 32, 32 and the slide guide shaft Since it is difficult to obtain the parallelism between the guide shaft 32 and the feed screw 36 with high accuracy, the load on each drive motor that rotates the pinion 34 and the feed screw 36 becomes large, and the small motor reduces optical power consumption with low power consumption. There was a problem that the pickup 30 could not be moved smoothly.

In addition, an appropriate backlash is indispensable between the gears of the rack 33 and the pinion 34 and between the ridge nuts and the troughs of the barf nut 35 and the feed screw 36.
Since there are variations in the processing accuracy of parts such as 33, the backlash between the rack 33 and the pinion 34, the half nut 35, and the feed screw 36 is increased due to the positional relationship of the mounting positions of each part. Was likely to occur. Therefore, in the optical pickup 30 that is not in contact with the reflecting surface of the compact disc, the optical pickup 30 rattles when the transfer body 31 slides due to the excessive backlash, and the information of the compact disc can be accurately read. There was a drawback that I could not. Such an optical pickup
In order to eliminate rattling during movement of 30, it is necessary to use highly accurate parts such as the rack 33, and also to use a complicated structure of the feed drive mechanism. There was an advantage.

In view of this, the present invention provides a pickup feed device that reduces the number of parts to reduce the weight and size of the device, and that allows the pickup to move smoothly.

[Means for Solving Problems] A pickup feeding device according to the present invention includes a transfer body on which a pickup for reading at least disc information is mounted, and a slide guide shaft arranged along the moving direction of the transfer body. A feed screw provided in parallel with the slide guide shaft, a slide guide portion provided on one side of the transfer body and inserted into the slide guide shaft, and a feed screw provided on the other side of the transfer body. And a feed guide portion for elastically sandwiching the feed guide portion from above and below, the feed guide portion having a rod-like portion attached to the transfer body, and a direction orthogonal to the axial direction of the feed screw. The third holding body having an elliptical opening into which the rod-shaped portion is inserted, the first holding body, and the second holding body, and the feed screw is held between the third holding body and the first holding body. Biased in the direction Urging means, a protrusion provided on one of the first holding body and the second holding body, and a recess provided on the other, the engagement of the protrusion with the recess (2) It is configured by a restriction portion that restricts the movement amount of the holding body in the direction orthogonal to the axial direction of the feed screw.

[Operation] With the rotation of the feed screw, the feed guide portion that elastically clamps the feed screw in the vertical direction moves, so that the transfer body slides along the slide guide shaft and the feed screw. At this time, as described above, the feed guide portion elastically clamps the feed screw in the vertical direction, so the backlash between the feed screw and the feed guide portion is small, and the pickup mounted on the transfer body is rattled. Move smoothly without.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 is, for example, a box-shaped chassis which constitutes a part of the body of a compact disc (CD) player. The chassis 1 is made of synthetic resin and has a rectangular opening 2 on the upper surface 1a, and the lower surface side is fully opened to reduce the weight. A turntable 3 on which a compact disc (not shown) is mounted is rotatably supported on one end of the upper surface 1a of the chassis 1 via a spindle 4. The spindle 4 is rotatable by a drive motor 5 via a belt 6.

Below both side edges of the opening 2 in the longitudinal direction, a metal rod-shaped slide guide shaft 7 extends in the radial direction of the compact disc mounted on the turntable 3.
And the feed screw 8 are arranged in parallel. Both ends of the slide guide shaft 7 are fitted into recesses 1c, 1c formed integrally with the side piece portions 1b, 1b of the chassis 1 facing each other and having a stepwise inclination, and fixed by screws 9. Further, the feed screw 8 is pivotally supported between the both side pieces 1b, 1b of the chassis 1, and a gear 10 is attached to one end portion penetrating from the side piece portion 1b on the turntable 3 side to the outside. It is fixed. The gear 10 meshes with a gear 12 of a drive shaft 11a of a drive motor 11 embedded in the upper surface 1a of the chassis 1 via intermediate gears 13 and 14.

Then, a substantially plate-shaped transfer body 16 on which the optical pickup 15 is mounted is provided between the slide guide shaft 7 and the feed screw 8.
Is installed. The transfer body 16 includes the optical pickup 15 for reading information on the pit surface recorded on the compact disc, along with the slide guide 7 and the feed screw 8 arranged in parallel to the direction for reading information on the compact disc. Slide guide portion 17 that is inserted into the slide guide shaft 7 on one side.
And a feed guide portion 18 for elastically holding the feed screw 8 in the vertical direction is provided on the other side. The optical pickup 15 includes a laser diode (not shown) that emits a laser beam, an objective lens 15a that focuses the laser beam, and an optical sensor (not shown) used to read an information signal. There is.

The slide guide portion 17 is composed of an upright piece 19 having a long hole 19a formed in the upper surface of one side of the transfer body 16 and through which the slide guide shaft 7 is inserted.
Is supported so that it can rotate in the vertical direction around the
It is slidable along the slide guide shaft 7 in the longitudinal direction of the shaft. In addition, the rotation of the transfer body 16 in the vertical direction is performed by the feed screw 8
And the feed guide portion 18 is meshed.

Further, as shown in FIGS. 3 and 4, the feed guide portion 18 is fixed to the upper surface of the transfer body 16 on the other side and is engaged with the lower side of the feed screw 8 to form a substantially L-shaped first portion. Holding object 20
And a second holding body 21 which is rotatably supported on the upper portion of the first holding body 20 and meshes with the upper side of the feed screw 8.
And a biasing means interposed between the first and second holding bodies 20 and 21 to reduce the backlash between the feed screw 8 and the respective holding bodies 20 and 21 to prevent rattling of these meshes. And a pair of extension coil springs 22 and 22 are formed in a substantially U-shape.

As shown in FIGS. 4 and 5, the first holding body 20 has a fixing piece portion 23.
A rod-shaped portion 24 standing on the rear surface of the upper surface 23a of the fixed piece portion 23 and standing substantially perpendicularly to the upper surface 23a, and a rod-shaped portion 24 at the rear end of the fixed piece portion 23.
And a supporting piece portion 25 standing upright in parallel with each other are integrally formed of synthetic resin. The upper surface 23a of the fixed piece 23
Is formed with a tapered mountain portion 23b of which the tip side is substantially the same as the shape of the valley portion 8a of the feed screw 8 in a direction orthogonal to the axial direction of the feed screw 8 and the mountain of the upper surface 23a is formed. Part 23
On both sides of b, a storage recess 23c and a screw hole 23d for the screw 26 for fixing the fixing piece 23 to the upper surface of the transfer body 16 on the other side are formed. On the other hand, the rod-shaped portion 24 is composed of a small diameter portion 24a and a large diameter portion 24b, and a boundary portion (regulating portion) 24c between these has a step shape. Further, hook portions 23e, 23e are formed in a protruding manner on both side surfaces of the fixing piece portion 23 on the rod-shaped portion 24 side. On the other hand, both ends of the upper end portion 25a of the support piece portion 25 are notched, and a round recess 25b is formed at the center of the rear surface.

The second holding body 21 has the feed screw 8 on the lower surface 21a of the front portion.
Two tapered ridges 21b, 21b having substantially the same shape as the valley 8a and the ridge 8b are formed in a protruding shape, and the length at which the small diameter portion 24a of the rod-like portion 24 is loosely inserted approximately in the center thereof. A circular elongated groove (opening) 21c is formed. Further, hook portions 21e, 21e are formed in a protruding manner at the centers of both side surfaces of the second holding body 21, and a rod-shaped shaft portion (projection portion) integrally formed in the recessed portion of the rear portion.
21d is fitted into the round recess 25b of the support piece 25.
As a result, the second holding body 21 is rotatably supported downward with the two crests 21b, 21b facing the crest 23b of the fixed piece 23 around the shaft 21d. 2 holding body
The amount of movement of 21 in the vertical direction orthogonal to the axial direction of the feed screw 8 is such that the lower surface 21a thereof is the boundary portion 24c of the rod-shaped portion 24 of the first holding body 20.
It is regulated by hitting.

The pair of tension coil springs 22 and 22 are respectively interposed between the hook portions 23e and 21e of the first and second holding bodies 21 and 22, and the trough portion 8a and the ridge portion 8b of the feed screw 8 are provided. 1st, 2nd holding body 2
Positioning is performed by engaging with the mountain portions 23b, 21b of 1, 22 so as to be sandwiched in the vertical direction, and the backlash thereof is minimized to prevent rattling when the transfer body 16 moves. To prevent it.

According to the pickup feeder of the above embodiment, when the drive motor 11 is driven to rotate the gear 12 thereof clockwise, for example, the feed screw 8 rotates clockwise through the intermediate gears 13 and 14. To do. Along with the rotation of the feed screw 8, the feed guide portion 18 that meshes so as to hold the valley portion 8a and the mountain portion 8b of each feed screw 8 moves to the turntable 3 side along the feed screw 8. By the movement of the feed guide portion 18, the transfer body 16 having the feed guide portion 18 fixed slides between the slide guide shaft 7 and the feed screw 8 along the axial direction toward the turntable 3 side. As a result, the optical pickup 15 mounted on the transfer body 16 moves in the radial direction of the compact disc for reading information on the pit surface of the compact disc.

When the feed guide portion 18 moves along with the rotation of the feed screw 8, the crests 23b and 21b of the respective holding bodies 20 and 21 are fed by the pulling force of the pair of coil springs 22 and 22, as shown in FIG. Since the screws 8 are constantly urged toward the valleys 8a and the peaks 8b, the peaks 23b and 21b of the holding bodies 20 and 21 and the valleys 8 of the feed screw 8 are held.
The backlash between the a and the mountain portion 8b is minimized, and a decrease in meshing preload can be prevented. This allows the optical pickup 15 to move smoothly without rattling when the transfer body 16 slides, and the information on the compact disc can be read accurately.

Further, the feed screw 8 is vertically attached to the first holding body 20 and the second holding body.
By elastically sandwiching with the holding body 21 via a pair of tension coil springs 22, 22, the transfer body 16 can be moved smoothly even if the parallelism between the slide guide shaft 7 and the feed screw 8 is not accurately obtained. Can be made. As a result, the load on the drive motor 11 can be reduced and the motor
11 can be miniaturized and power consumption can be kept low.

Further, since the feed screw 8 has a function as the slide guide shaft 7 to reduce the number of parts to one slide guide shaft 7, the driving motor 11 can be downsized as described above. The weight and size of the entire device can be further reduced.

In the above embodiment, the pickup feeding device applied to the compact disc player is shown, but the present invention can be applied to the pickup feeding device of a laser vision player or a compatible player of a laser vision (LV) and a compact disc. Further, it is needless to say that it can be applied to a pickup feeding device for writing information on a disc.

[Advantages of the Invention] As described above, according to the present invention, the feed screw has a function as a slide guide shaft, and the number of parts is reduced by reducing the number of parts to one slide guide shaft. The size can be reduced.

In addition, by providing a feed guide portion composed of a first holding body, a second holding body, and the like for elastically holding the feed screw in the vertical direction on the other side of the transfer body, the feed screw and the feed guide portion are provided. The backlash can be made as small as possible to prevent the meshing preload of the both from lowering. Further, with the long axis direction of the oval opening of the second holding body set in a direction orthogonal to the feed screw, the oval opening of the second holding body is formed in the rod-shaped portion of the first holding body. Since the portion is inserted, the second holding body does not move in the axial direction of the feed screw with respect to the first holding body. Furthermore, by providing a regulating portion for regulating the amount of movement of the second holding body in the direction orthogonal to the axis of the feed screw of the second holding body, the second holding body is provided.
Since the rotation of the holding body can be regulated in cooperation with the insertion of the rod-shaped portion of the first holding body and the oval opening of the second holding body, the transfer body can be smoothly moved along the slide guide shaft. It can be moved. As a result, the pickup moves in the radial direction of the disc without rattling, and the information on the disc can be read accurately.

Furthermore, since the transfer body can be moved smoothly without highly parallelizing the slide guide shaft with the feed screw, the load on the drive unit for rotating the feed screw can be small, and Since parts such as screws do not have to be processed with such high precision, there is an advantage that it is possible to provide a low-cost and inexpensive pickup feeder.

[Brief description of drawings]

FIG. 1 is a perspective view of a feeder for a pickup showing an embodiment of the present invention, FIG. 2 is a bottom view of the same, FIG. 3 is a front view of the same main part, FIG. 4 is a perspective view of the same main part, and FIG. Is an exploded perspective view of the same main part, FIG. 6 is a perspective view of a main part of a conventional pickup feeding device, and FIG. 7 is a perspective view of another conventional part. 7 ... Slide guide shaft, 8 ... Feed screw, 15 ... Pickup, 16 ... Transfer body, 17 ... Slide guide section, 18 ... Feed guide section, 20 ... First holding body, 21 ... Second holding body, 21c ... Long slot (Opening part), 21d ... Shaft part (projection part), 22 ... Tensile coil spring (biasing means), 24 ... Rod-shaped part, 24c ... Boundary part (regulating part), 25b
… Recessed.

Claims (1)

[Scope of utility model registration request] 1. A transfer body on which a pickup for reading at least information on a disc is mounted, a slide guide shaft arranged along a moving direction of the transfer body, and a feed screw provided in parallel with the slide guide shaft. A slide guide portion provided on one side of the transfer body and inserted into the slide guide shaft; and a feed guide portion provided on the other side of the transfer body for elastically holding the feed screw in the vertical direction. The feed guide portion has a first holding body having a rod-shaped portion and attached to the transfer body, and a long axis direction orthogonal to the axial direction of the feed screw, and the rod-shaped portion is inserted therethrough. A second holding body having an oval opening formed therein, a biasing means for biasing the first holding body and the second holding body in a direction of holding the feed screw, and the first holding body. Between the holding body and the second holding body A protrusion provided on one side and a recess provided on the other side, and the amount of movement of the second holding body in the direction orthogonal to the axial direction of the feed screw is increased by engaging the protrusion with the recess. A pickup feeding device comprising a regulating portion for regulating.