JPS57200907

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DESCRIPTION JPS57200907
Description 1, title of the invention
Pickup cartridge of disc-shaped information recording medium reproducing apparatus
It is an object of the present invention to provide a pickup cartridge of a disk-shaped information
recording medium reproducing apparatus, which protects the detailed description of the
invention at the time of transportation and mounting and automatically detaches the cartridge
cover at the end of mounting. A pickup cartridge used in a conventional disk-shaped information
recording medium reproducing apparatus covers the reproducing needle 1 with an openable lid
2 to protect the reproducing needle 1 and the ribbon 8 as shown as an example in FIG. The tip of
the pickup arm 5 is held near the tip of the pickup arm 5 by the cartridge case i 14 & the wall 2
of the lid 2, and even if the pickup cartridge 6 receives an impact during transportation etc.
There is what was configured not to. However, the pickup car 6) is protected only by the
reproduction needle 1 and the ribbon 8 at its tip, and the pickup arm 5 and the elastic
supporting portion 7 of the pickup arm are not exposed and protected. There is a risk that the
pick-up arm 5 or the elastic support 7 of the pick-up arm, which is exposed when mounted on
the pick-up device, may be damaged. The present invention eliminates the above-mentioned
drawbacks and will be described with reference to FIG. FIG. 2 is a partial cross-sectional plan
view of an example of the reproducing apparatus using the pickup cartridge of the disk-shaped
information recording medium reproducing apparatus according to the present invention. The
pickup device is incorporated in a housing 11 which moves in the radial direction of a disk-like
information recording medium (hereinafter referred to as "disk") 10, and the sliding needle like
track of the disk 10 rotates in the arrow X direction. Play by playing. The pick-up device 13
receives the pick-up cartridge 14 shown in FIG. 8 and the pick-up car) ridge 14 and rotates
together with the pick-up car 14 shown in FIG. The mounting mechanism section 15 and the
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drive coil II section 16 shown in # 15 vA which cooperates with the pickup cartridge 14 fixed
and mounted in the nose leg 11 are roughly constituted. 8 and 6 respectively show an exploded
perspective view and a side view of a pickup cartridge of a disk-shaped information recording
medium reproducing apparatus according to the present invention. In both figures, the pick-up
cartridge 14 comprises a plastic cartridge case (hereinafter referred to as "case") 18, a pick-up
arm assembly 19 incorporated in the box -218, and a plastic cartridge cover 20 for protecting
the case 18. .
The case 18 generally comprises a top 21 and hanging walls 2L28 on both sides, and the back
side is an opening. Both sides of the top 21 and inside the wide part are ridges 21a and 21b, and
notches 21o and 211 are provided at corners near the narrow part of the top 21 on the upper
surface side of the ridges 21a and 21b. . The length of one hanging wall 22 is shorter than the
length of the other W2B5, and a window 24 for receiving a central conductor described later is
formed. Further, fitting notches 22a, 22b, lo, 28m, 98b are provided in the depending walls
22.28. 28c is formed. Further, the reproducing needle 12 is attached to the tip of the pickup arm
26 of the Eve having a recess 25 & having a pick-up arm receiving recess 25 & apos; in the case
18, and a rubber elastic support 27 is attached to the base of the arm 26. In addition, a
cylindrical rare earth permanent magnet 28 magnetized in the longitudinal direction is pressed
into the base of the arm 26. The elastic support 27 includes a ring 2a fitted to the arm 26,
cylindrical arm portions 27b and 27c protruding from both sides of the ring 2a, and flanged
small diameter portions 27a and 2f at the tip end of each cylindrical arm portion. It consists of
The regenerating needle 12 is fixed to a plastic needle holder 29 and attached to the pickup arm
26. The pick-up arm assembly 19 described above is a cylindrical arm F of the elastic support
27! With tension applied to ifs 27b # 27o, the flanged small diameter portions 27d, 27e are
pushed into the fitting notches 28b, 28m) and attached to the case 18. The above-mentioned
assembly 19 is a cylinder arm 27b, 2? In a free state where o is not torsionally deformed, the
pickup arm 26 is mounted in a posture in which it is inclined upward and enters the recess 25 &
apos ;, that is, in a state of being retracted in the case 1s. The metal ribbon 80 has one end
connected to the reproduction needle 1 B, and the hole 80 & at the other end fitted to the lower
surface protrusion 91 a of the narrow portion of the top plate 21, and the wide contact portion
80 b is the top plate 21. Located on the lower surface of the narrow part of the The cartridge
cover 20 generally includes a bottom plate 81, walls 82 and 88 on both sides of the wide portion
of the bottom plate 81, walls 84 and 85 on both sides of a narrow portion of the bottom plate 81,
and a wide portion of the bottom plate 81. Cover the front wall, part and sides of the rear and
narrow part. The wall portion 86 is provided with a window 8.61 for receiving the needle vertical
position control coil when mounting the pickup cartridge 14 described later on the rotation
mounting mechanism portion 15. When the cartridge cover 20 is attached to the case 18 on the
bottom plate portion 81, the drooping mg2. In order to receive the step-like convex part 40.41
and convex part 42.48 which abut on ga and support this, and the pick-up arm 26, r! !
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A wall 44 having JfM 44m is integrally formed. The locking member 88.89 has a U-shaped cross
section, one side of the U being integrally formed with the outside of the wall 84.85, and the
other side being cut off from the outside EndPage: 2 separated from the side by a U-shaped
bottom 88a. , 89a as a fulcrum, it is elastically displaced so as to be able to approach and be
separated, and claws 88b, 89m) are provided on the upper part thereof. When the pickup
cartridge 14 is transported and stored as a replacement part, the case 18 attached to the rotation
attachment mechanism is fitted into the cartridge cover 20, and the lower end and the outer end
of the rear of the hanging wall 22.28 of the case 18 There is a cartridge cartridge (a stepped
convex portion 40.41 G of -20, butt, and a drop a! The lower end of the front part of 22.28 is
supported in abutment with the projection 42.48. The wall portion 25 of the case 18 and the
cartridge cover 107) illls 44 extend in a direction orthogonal to the axial direction of the pickup
arm 26, and the four portions 25 & and 44 & intersect each other from the four opening side and
are all around Form a closed rhombus-shaped hole. As a result, the pick-up arm 26 is held loosely
near the tip end in the upper l-shaped hole, and the pick-up arm 26 'f (f' f1. The lower side of the
body 19 is covered by the bottom plate portion 81 of the cartridge cover 20. Maw, the claws
88'b and 39b of the locking members 88 and 89 lock the notches 21c and 214 of the case 18 so
that the carting cover 20 is not disengaged from the case 18, and the wall portions 82.88 are
formed. Grooves 45. 46 are formed apart so as to pass through a hanging wall provided on a
slide base of the rotational mounting mechanism 15 described later. The rotational mounting
mechanism portion 15 is composed of a glass 47 and a lid member 48 made of a metal plate as
shown in FIG. The two members 47 and 48 are connected by a set screw 49. The leg portions
48m and 48b on both sides of the lid member 48 are pivotally supported by the drive fill of the
drawing and the shaft 50 of the mechanism portion 16 shown in the drawing and substantially
perpendicular to the substantially horizontal mounting position 14). It pivots with respect to the
non-mounting position (the position t where the pickup car ridge 14 is inserted and J is
extracted). Further, at the front end portion thereof, there is provided a knob village screw 52 for
fixing the rotary mounting mechanism 15 to the housing 11 at the time of mounting. FIGS. 7A
and 7B show a front view and a side view of the slide base 4.7. Hanging bodies 58.54 are
integrally formed on both sides of the lower surface side of the slide base 47, whereby guide
grooves 58a and 54a for receiving the flange portion alas 21b of the case 18 are formed.
The receiving end of the pickup cartridge 14 of the hanging body 58.54 is inserted at the tip end
side 53b, 54b lower in height than the groove 45.46 shown in FIG. 6 and the rear end side 58C
1540 is higher in height than the groove 45.46 So it is gradually inclined. Further, a base plate
57 to which the needle vertical position control coil 56 is fixed is supported by the projections
55 a and 55 b on the projection 55 of the lower surface of the slide base 47, and screwed with a
screw 58. The drive coil mechanism unit 16 includes a plastic coil attachment 51 and one direct
acting coil 61. Four (1 tracking coil 6Ba # 62b # 68am 68b ヲ fixed scene. Each carp h61 # 6Z
&, 621), 6a & # 68b are nonmagnetic bobbins 65.66m, 66b respectively. The bobbin is wound
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on a 67 ms Q 7 b, and each bobbin is implanted in the coil attachment body 51. The coil
mounting body 51 is mounted on the bottom plate 11 a of the housing 11 by screws f 34 a and e
4 b and supports the shaft 50. Here, the tracking coil protrudes inward of the arm 51 as 5 lb of
the coil mounting body 51, and is positioned on the opposite side of the elastic support 27 to the
elastic support 27 at the end of mounting the cart and ridge described later. And a pair (6131L,
68b) located on the reproduction needle side. Here, due to the arrangement in which the tracking
coil is positioned on the reproduction button side from the elastic support 27, mounting of the
cartridge can not be performed by only simple insertion operation, and there are two steps of
insertion and rotation operation. The flanged small diameter portion 66L-1a 66b-1 of the
bobbins 66a, 66b has a function of determining the position of the case 18 (pickup arm assembly
19) in the horizontal plane in cooperation with the fitting notches 22 & # 28a. . ピン68a。
68b is implanted on the top surface on the tip side of each arm 51aa 51b of the coil mounting
body 51, and has a third EndPage that determines the height position of the case 18 (pickup arm
assembly 19). Next, an operation of mounting the pickup cartridge at a predetermined position
will be described. The mounting operation is performed in two stages of insertion and rotation in
relation to the placement of the tracking coil. First, the rotation mounting mechanism portion
151i is rotated to a substantially vertically rising position, and in this state, the pickup cartridge
14 of the sixth illustration is inserted into the slide pace 47. The pickup cartridge 14 is inserted
by closely fitting the flanges 21a and 21b into the guide grooves 58a and 54m, respectively, and
pushing it along to the final position.
By this insertion, the control coil 66 relatively enters the casing XlS through the window 86 & of
the cartridge cover 20 and faces the permanent magnet piece 28 of the pickup arm assembly 19.
In the first half of this insertion, the tip end side 58154b of the hanging body 58.54 passes
through the groove 45.46, but in the second half each of the rear end sides 58o and 54a is taller
than the groove 45.46 The wall 82.88 of the cartridge cover 20 is pushed down. Also, in the final
insertion position, the claw 88b is pushed by the tip of the hanging body 58.54 which has
advanced through the groove 45.46. 89b is pushed and the locking members 88. 89 are
elastically displaced, and the claws 88b, 891) are separated from the notches 21c, 21d,
respectively, and the cartridge cover 20 is separated from the case 18. For this reason, there is
no possibility of touching the regenerating needle 12 and the body y% 19 until the end of the
insertion operation, and there will be no accident that will damage these. Next, the pivoting
mounting mechanism 15 pivots to a substantially horizontal position and is fixed to the one
housing 11 with a holding screw. In this state, the case 1B is positioned with respect to the fixedside fill attachment body 51, and the metal ribbon 8 ° presses against the central conductor 7o
of the resonator 69. In the case 18, the becking date parts L2a, 28a are fitted in the smalldiameter parts 66a-1-66b-1 of the bobbin 66ae 66b so that their positions in the horizontal
plane can be determined, and both sides of the top plate 21 described later You can press the bin
68ae 68b to determine the height position. Since the pick-up arm assembly 19 is attached to the
case 18, the pick-up arm assembly 19 can be accurately positioned in the horizontal direction
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and the height direction with respect to each coil (including the coil 56), needle elevating
operation, jitter The compensation operation and the tracking control operation are accurately
performed. The cartridge cover 20 may be forcibly released by a spring or the like after the
pickup cartridge 14 is completely mounted on the rotation mounting mechanism, and is not
limited to the above embodiment. As described above, the pickup cartridge for the disk-shaped
information recording medium according to the present invention is engaged with the cartridge
case attached with the pickup arm assembly and the lower and side surfaces of the cartridge case
to protect the pickup arm assembly. The cartridge cover comprises a cartridge cover which
comes into contact with the mounting mechanism when it is inserted into the mounting
mechanism of the disk-like information recording medium reproducing apparatus to a
predetermined mounting position and is released from engagement and disengaged from the
cartridge case. The whole is protected by the cartridge cover, and it will not be damaged by
touching the operator's hand during transport and installation of the pickup cartridge, and also
in connection with the mounting operation of the pickup car) ridge. The cartridge cover is
automatically removed and the cartridge cover And it has a feature of never bothering the
operator's hand during removal of chromatography and the like.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an example of a
conventional pickup cartridge, and FIG. 2 is a partial cross section of an example of a
reproducing apparatus using the pickup cartridge of the disk-shaped information recording
medium reproducing apparatus according to the present invention. A plan view, FIG. 8 is an
exploded perspective view of a pickup cartridge of the disk-shaped information recording
medium reproducing apparatus according to the present invention, and FIG. 5 is an exploded
perspective view of the drive coil mechanism portion of the second illustrated device, FIG. 6 is a
side view of the pickup cartridge of FIG. 8, FIG. A) and (B) are respectively a front view and a side
view of the slide base of the eighth illustrated device. lO ... disc, 11 ... housing, 12 ... styli, 18 ...
pick-up device, 14 ... pick-up cartridge, 15 @@ * turning EndPage: 4 months τ Toritsuji force bar,
21- · · Top plate, 1.28-· Hanging wall, L5, 44 · · · Wall, 25a, 44a · · · · · · · · · · · · · · · · Pickup arm, 27 ·
· · elastic support, 81--bottom plate portion , 82-87 one--wall portion, 88, 89 ... locking member,
881), $ 9 b ... claw, 40-48 ... convex portion, 45, 46 ... groove, 47 .. · Slide base, 48 · · ·-Lid
member, 49.52 · · · Set screw, 50 · · · axis · 51 · coil mounting body, 5B · · · · hanging body, 58a,
54a · · · guide groove. EndPage: 5 Procedure Amendment June 26, 1959 Patent Secretary General
Secretary Haruki Shimada (Patent Examiner) 1, Display of the Case Showa 561 Patent
Application No. 84717 No. 2, Invention Name 2, Invention Name Disc Pick-up cartridge 3 of the
shape information recording medium reproducing apparatus, the person who makes corrections
Patent applicant address 8221 Name: 3-12, Moriya-cho, Kana district, Kanagawa Prefecture
8221 Kanagawa Prefecture Name (432) Nippon Victor Co., Ltd. Agent
Pickup cartridge of disc-shaped information recording medium reproducing apparatus
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Spontaneous correction 6, column of the detailed description of the invention of the subject of
correction and drawings. 7. Contents of correction (1) In the specification, correct the
protrusion 21 C on page 5 line 20 with protrusion 21 e 0 (2) same as set screw on
page 12 line 10 To "set screw 52". (3) In the drawings, correct FIG. 3 and FIG. 7 according to the
attached correction drawing. EndPage: 7 Warning: Page Discontinuities
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