JPS634308Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pickup scanning table for a disk player, and is particularly intended to improve the accuracy of cantilever position detection.

In a capacitive video disc player, a pickup is detachably attached to a pickup scanning table of the player to facilitate replacement. This pick-up scanning table is equipped with an arm stretcher that engages with the pick-up, a terminal that is connected to the fly lead of the pick-up, and a pair of arm stretchers that are parallel to the extending direction of the cantilever to detect the attitude of the cantilever. Electrodes are arranged to sandwich the fly lead. By the way, in a conventional player, this electrode is constructed by bending the other lead of a variable capacitance diode whose one lead is connected to the main body of the scanning table. However, in this case, it is difficult to constantly and stably detect the attitude of the cantilever because each electrode is easily deformed or displaced by external impact or the like. The present invention attempts to eliminate this drawback by configuring the pick-up so that when the pick-up is set in the pick-up storage section of the pick-up scanning platform, the cantilever of the pick-up is always detected in the correct posture, thereby improving detection accuracy. It is an attempt to do so.
Next, a player employing the present invention will be explained according to an illustrated embodiment. Although this embodiment shows a so-called CED type video disc player, it goes without saying that the present idea is not limited to this and can be applied to various disc players.

This disc player is used with a disc protection case called a kyadey. The player contains a video disk and a spine supporting the video disk, which are integrated outside the player to provide complete protection for the disk. An outline of the operation of loading and retrieving the caddy into the player will be explained with reference to the dashed line in FIG. When the Kyaday CA containing the spine with disk is inserted into the player PL and then pulled out, the lock between the Kyaday and the spine SP is released with the claw NA, and the spine is removed.
Since the SP is held by the holding and releasing means HR, it is possible to leave the spine SP inside the player and extract only the kidney CA. Next, when the empty candy is inserted to the insertion completion position and then pulled out toward the front, the clamping and releasing means HR releases the spine SP, so the spine SP is pulled out by the caddy CA by the frictional force, and the locking piece LO is separated from the claw NA. Since the spine SP with the disc and the kayak CA are integrated into one body, the spine SP with the disk is engaged with the notch in the kayak CA.
The clamping and releasing means HR repeats clamping and releasing every time the carrier CA is inserted, and is configured to lock the spine SP by the odd-numbered insertion and release the lock by the even-numbered insertion. has been done.

This disc player can move the spine holder to two positions, up and down. In the upper position, the disc is exchanged between the player and the player, and in the lower position, the disc is placed on a turntable whose rotation plane does not displace. In addition, the spine is configured so that its rotation is not hindered. Next, details of its configuration and operation will be explained. FIG. 1 is a plan view of the player in the upper position of the spine holder (with the canopy removed), FIG. 2 is a central sectional view thereof, and FIG. 3 is a central sectional view of the player in the lower position of the spine holder. In each figure, 1 is the front panel, 20 is the chassis,
40 is a turntable, 60 is a spine holder, and 80 is a pick-up scanning table.

The front panel 1 has a slit 2 for attaching and detaching the kayak CA, and the slit is normally closed by a lid body 3 which is biased (not shown) to take the closed position. When inserted, the lid is opened around the support shaft 4 as shown by the broken line in FIG. When the spine holder 60 is set at the lower position, the lid body 3 is rotatably supported on a support shaft 5 attached to the front panel 1, as shown in FIG. 4, which is a partially cutaway view of the front panel. The stopper 6 is rotated clockwise against the spring 7, and the stopper restricts the rotation of the lid 3 near its center, and the cutout 61 at the front left of the spine holder 60 also prevents the lid from rotating. The rotation of 3 is regulated. The rotation of the stopper 6 is controlled through a pin 8 that comes into contact with the lower surface of the spine holder 60.

The chassis 20 has inverted L-shaped first and second locking pieces 21 and 2 that regulate the upper position of the spine holder 60.
2, and first, second, and third guide rods 23, which guide the movement of the spine holder 60.
24 and 25 are planted vertically. This chassis 20 is further equipped with a structure for supporting the following elements. That is, a stator that constitutes a power transmission mechanism 26 for moving the spine holder 60 in the vertical direction, a guide mechanism 27 for moving the pick-up scanning table 80 in the left-right direction, and a motor M ₁ for rotating the turntable 40. It is 28.

The power transmission mechanism 26 includes a motor M ₂ , a worm 30 to which rotation of the motor is transmitted via a belt 29 , a spur gear 31 meshing with the worm, and a first gear rotated via a normally closed clutch 32 . Cam wheel 3
3 and a second cam ring 35 that is rotated via a rotating shaft 34. Each of the cam wheels 33, 35 has a cam surface 33a on the outer surface side, as shown in FIG.
35a, so that cam followers 62 and 63 attached to the spine holder 60 are moved synchronously in each vertical direction. Guide mechanism 2
7 is a rod-shaped first guide 37 disposed to extend laterally behind the pick-up scanning table 80;
A second guide 38 is provided to support a slider 81, which is disposed in front of the pick-up scanning table 80 so as to extend laterally, from both sides thereof. The slider 81 is driven by a motor (not shown) when the spine holder 60 is set at the lower position, so that the pick-up scanning table 80 can be moved laterally along the first and second guides 37 and 38. ing. The turntable 40 is molded with resin as shown in the figure, and is press-fitted and fixed to the rotating shaft 41. This turntable 40 includes a hub 43 that supports an annular rotor magnet 42 facing the stator 28. When this turntable 40 is attached to the stator 28, the position 44 of the rotation plane relative to the chassis 20 is kept constant. Reference numeral 45 denotes a center metal fitting that receives the center hole of the disk D, and is biased upward by a spring 46 so as to be movable in the axial direction of the rotating shaft 41. This center metal fitting 4
Reference numeral 5 has a substantially truncated cone shape, and is configured to absorb even if the disk is accessed with a certain degree of eccentricity. The back side 40b of the table surface 40a of the turntable 40 is provided with protrusions 47 arranged at equal pitches in the circumferential direction. A light emitting source 48 and a light receiving element 49 are arranged on the chassis 20 so as to sandwich the protrusion 47 therebetween, and the light beam from the light emitting source 48 is intermittently blocked in relation to the rotational speed of the turntable 40. In this way, the rotation detection signal is presented as the output of the light receiving element 49. The spine holder 60 has side walls 65 and 66 that have grooves 64 on both left and right sides that guide and support the candy CA and the spine SP therein.
and the rear wall 6 that regulates the insertion position of the Kyaday CA.
7, and the first, which is divided into front and rear parts,
It is provided with second bottom plates 68 and 69. Left side wall 6
5 is equipped with a first guide roller 70 that is rolled by the guide rod 23 on the outside thereof, and further has a first cam follower 62 that rolls in contact with the cam surface 33a of the first cam ring 33 on the inside thereof. Further, the head portion 21a of the first locking piece 21 is provided with a first tongue piece 71 that faces from below. Note that the left side wall 65 is provided with the cut-out portion 61 at the upper front thereof as described above. The right side wall 66 has second and third guide rods 24 on the outside thereof.
25 are provided with second and third guide rollers 72 and 73 that are respectively rolled, and the head 2 of the second locking piece 22 is provided with
2a is provided with a second tongue piece 74 facing from the lower side thereof, and further provided with a first cam follower 63 in rolling contact with the cam surface of the second cam ring 35. Although not shown, the right side wall 66 is further provided with a spring for keeping the second guide roller 72 in pressure contact with the second guide rod 24 at all times. In addition, there is a spine at the back of the groove 64 on each of the left and right side walls 65 and 66.
It is equipped with a claw NA (only the right side shown) that displaces the lock piece LO of the SP. The rear wall 67 is provided with a means HR for releasing the spine SP.
As mentioned above, depending on the number of times Kyaday is inserted,
I am trying to repeat the release process alternately. Further, there is also a means, which is not shown, for pushing the caddy CA a little forward when the caddy CA is inserted to its insertion completion position and then released.

The first bottom plate 68 faces the slit 2 and has a slope 68a that slopes downward toward the front to facilitate attachment and detachment of the kayak CA. Further, this first bottom plate 68 is provided with through holes 68b and 68c on both its left and right sides,
A piece 75 supported by a shaft 75a is made to swing therein. This piece 75 is biased upward by a spring 76, and in the upper position shown in the figure, it projects slightly above the surface of the first bottom plate 68 and forms a slight upward slope in the direction of approach of the kayak. . This is because the piece 75 is moved backward by the insertion of the carriage CA, and the disk D is supported independently of the first bottom plate 68 after the carriage is removed. Note that a similar third piece 77 is also provided in a through hole 69a provided approximately at the center of the second bottom plate 69. The first bottom plate 68 is provided with a through hole 68d at its left end, and the spine holder 68 is provided with a through hole 68d.
The structure is such that the first locking piece 21 is released when it is displaced to the lower position of 0 (see FIG. 5). 1st, 2nd
Since the heads of the locking pieces 21 and 22 are relatively spaced apart from the chassis 20, there is a possibility that the locking pieces 21 and 22 may bend in the left-right direction. Even if the first and second tongue pieces 71 and 74 are arranged at predetermined positions of each of these locking pieces 21 and 22, if the above-mentioned deflection is allowed, each tongue piece 71,
74 comes off from the heads 21a, 22a, and the upper position of the spine holder 60 cannot be regulated. In this embodiment, in order to prevent such malfunction, an angle 78 is provided on the right side wall 66 to restrict the deflection of the second locking piece 22, and a cylindrical piece 79 is installed in the through hole 68d. . Before mounting this piece 79, the spine holder 60 is attached to each tongue piece 7.
1 and 74 are accessed downward and slightly to the right in order to dispose them below the heads of the first and second locking pieces 21 and 22. Next, this piece 79 is installed from above the through hole 68d to restrict the deflection of the first locking piece 21 and prevent the spine holder 60 from coming off upward. Note that the piece 79 is prevented from coming off upward by locking a claw provided on the piece to the first bottom plate 68 (not shown).

As shown in FIG. 7, the pick-up scanning table 80 is equipped with a pick-up storage section 82 and a lid 83 for opening and closing the storage section 82. When the lid 83 is opened, gears 84, 85 and a pinion 86 are opened.
7, the arm stretcher 88 is retracted to the retracted position (solid line), and the arm stretcher 88 and the pick-up PU are connected by the lid closing operation. There is a cantilever inside the housing part 82.
a coil 89a for applying a stiffening force to CL;
89b, and a printed circuit board 90 for fixing predetermined parts. As shown in FIG. 8, this printed circuit board 90 has a pair of protrusions 91 and 92 facing each other with the fly lead FL interposed therebetween, and has conductive patterns 91a and 92a on the surface thereof. The distance between each of these patterns 91a, 92a and the fly lead FL is detected based on the difference in capacitance between them.

Next, the operation of this player will be briefly explained. When loading or unloading a disk, the spine holder 60 is in the upper position shown in FIGS. 1 and 2, and therefore the means 6 and 61 for regulating the lid 3 are retracted, allowing insertion of the caddy CA. When a Kyaday CA with a spine with a disk inside is inserted to the insertion completion position and then removed, the spine SP
can be left on the spine holder 60.
The timing of extracting the canday CA is detected (for example, the closing of the lid body 3 is detected) and the motor _M2 is driven. Then, the cam followers 62, 63 of the spine holder 60 are made to respond to the rotation of the first and second cam wheels 33, 35, and the first to third guide bars 23, 2
The spine holder 60 is lowered along lines 4 and 25 to its lower position (the position in FIG. 3). In this lower position, the spine holder 60
Since the table surface of the turntable 40 is in a higher position than the surfaces of the first and second bottom plates 68 and 69, the disk supported by the turntable can freely rotate without contacting the spine holder. In this lower position, as clearly shown in FIG. 5, the spine holder 60 is retracted to allow the movement of the pick-up scanning table 80. The motor allows the pick-up PU to access the disk in the radial direction. In this play state, the lid body 3 is prevented from opening by means 6, 6.
1, so there is no risk of accidentally inserting another cartridge. When the pick-up scanning table 80 returns to the initial position after the end of the play, it is detected and the motor _M2 is rotated in the reverse direction, so that the spine holder 60 can be returned to the upper position by an operation opposite to that described above. During this return process, the spine holder 60 moves the disk D to the turntable 4.
Separate from 0. By returning to the upper position, the closing restriction of the lid body 3 is released, so that an empty caddy can be thrown in and the caddy can be recovered therein.

As described above, in the present invention, electrodes for detecting the attitude of the cantilever are formed on a pair of protrusions of a printed circuit board that extend in a direction substantially perpendicular to the direction of extension of the fly lead and close to each other. By arranging the printed circuit board at a predetermined position on the pick-up scanning table, the relationship between the pair of conductive patterns can be maintained constant, and the relationship between the pair of conductive patterns can be maintained constant. It is practical because it can accurately detect the attitude of the cantilever following the arranged fly lead. In addition, the main body of the scanning table of the present invention is rotatably equipped with a lid that covers the opening for taking out the pick-up, and the lid is engaged with and disengaged from the cantilever via a pinion and a rack according to the opening/closing operation of the lid. Since the arm stretcher is configured to move forward and backward, the pickup can be attached to and removed from the pickup housing extremely smoothly, which is practical.

[Brief explanation of drawings]

The drawings are all related to the disc player of the present invention. Fig. 1 is a plan view with the canopy removed, Fig. 2 is a sectional view taken along line A-A' in Fig. 1, and Fig. 3 is the lower position of the spine holder. FIG. 2 is a sectional view corresponding to FIG. 2; FIG. 4 is a front view with the front panel partially removed. FIG. 5 is a sectional view taken along the line BB' in FIG. 1, and A and B show the upper and lower positions of the spine holder, respectively. FIGS. 6A and 6B are correlation diagrams of the first cam ring and the cam follower in different states. FIGS. 7A and 7B show partial views of the pick-up scanning table in an open state, where A is a plan view and B is a central sectional view. FIG. 8A is a partially enlarged view of FIG. 7A, and FIG. 8B is a sectional view taken along line C-C' of FIG. Explanation of main drawing numbers CA...Kayaday, SP...Spine, 1...Front panel, 20...Chassis, 40...Turntable, 60...Spine holder, 80...Pick-up scanning table, 91,
92...A pair of protrusions.

Claims (1)

[Claims for Utility Model Registration] (1) A scanning table main body having an opening for vertically taking out a pick-up, the extension of the pick-up with respect to a cantilever of the pick-up housed and set in a pick-up accommodating portion of the scanning table main body. A pick-up scanning table comprising a printed wiring board having a pair of protrusions having end faces substantially parallel to the direction and having a conductive pattern on a plane adjacent to the end faces. (2) The scanning table main body is rotatably equipped with a lid that closes the opening, and the lid has an arm stretcher that engages and disengages from the cantilever via a pinion and a rack in accordance with the opening and closing operations of the lid. 1. A pick-up scanning platform according to claim 1, which is configured to advance and retreat a player.