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DESCRIPTION JPS562689
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a cartridge
main body and a knob member separately in one embodiment of the present invention, and FIG.
2 is a cross-sectional view taken along line 2-2 of FIG. is there. Reference Signs List 1 cartridge
body 2 knob member 3 housing 4 light source 5 photocell 6 base 7 coil bobbin 9 10・ 佃-9a.
DESCRIPTION OF SYMBOLS 10a ... pole piece, 11 ... locking receiving part mi 13 ... locking step,
14 ... frame, 15 ... convex part, 16 ... convex locking tool, 17 ··· Needle assembly, 20 ··· Columnar
magnet (armature).
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pick-up
cartridge capable of setting a needle tip at a constant position even during needle replacement.
Recently, there has been proposed a cartridge provided with a sound groove reader of the 1c
likelihood conversion type that discriminates between a recording band and a non-recording
band of a record board. This sound groove reader has a light source for irradiating light to the
sound groove and a photo sensor for measuring the amount of reflected light, and converts a
change in the amount of reflected light corresponding to the recording state of the sound groove
into an electric signal. In this case, this' electric signal is supplied to the automatic music
selection device of the record player, etc. if it is 〇. In this case, the sound groove a removing
device accurately reads the sound groove which the needle tip actually traces. However, the
distance between the sound groove reading position and the point> 1 is not as small as possible,
and nl-1 'can not be obtained. However, in a cartridge having a single columnar armature as
shown in Japanese Examined Patent Publication No. 59-26789, the source of the needle
exchange is an axial direction of the cantilever. It has been pointed out that wrinkles will occur
regardless of the aforementioned 2-positional relationship. That is, the replacement needle is
inserted into the cylindrical gap formed on the cartridge main body side with the axial direction
of the cantilever as the insertion direction, but in this case, the axis line resulting from the
incomplete insertion It is empirically known that an error in the needle point position in the
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direction occurs about ± 0.7 mm to about 1.5 に 対 し て with respect to that reference position.
Although it does not give, when the needle point is located above the groove reading position, the
groove reading device does not function, and it is brought to a position where it gets too close
and partially blocks the light flux of the groove reading device. Then, the intercepted likelihood
bundle appears as a false signal. When tracing the sound groove with a small curvature on the
inner side of the record when the tip of the label is located away from the groove reading device,
the sound groove reader actually traces the needle tip. In order to read B # l different from ui4,
the purpose of this study is to create a single columnar armature that can secure a certain needle
tip position even when changing needles. It is an attempt to provide a pinoqua astroca torino 6di. Hereinafter, embodiments of the present invention will be described with reference to the
accompanying drawings. Referring to FIGS. 1 and 2, this cartridge comprises a cartridge body 1
incorporating an electromagnetic transducer housing, and a knob member 2 fitted and locked
from below with respect to the body 1 .
The main body 1 is provided with a plastic housing 6, and at the θIJ side portion of the housing
3, an f ′ (14, a skimming device comprising a leading edge 4 and a photocell 5 is provided. In
this case, the light sources 4 and 7 are arranged such that the light emitted from the light source
4 enters the sound 4 actually traced by the tip and the reflected light from the pedestal enters
the photocell 5. Set up QO Note: Sound # Iq "ie direct connection via external resistance 25 and
lead 26 through an external control device! It is connected to t etc. The base 6F made of a
synthetic resin and assembled on the bottom of the housing 6 (the side of the coil pobin 7 is
disposed sideways, the upper surface side of the base 6 including the screw pin 7) Is covered by
the magnetic case 8. In the case of the cartridge for stereo 4-leo, at least two coil bobbins are
provided, but in this drawing, only the bobbin of -force is shown for convenience. From the front
side of the bobbin 7, the yoke 9 and from the rear side, the yoke 10 extends downward, and the
tips of the yokes 9 and 10 extend along the bottom surface of the base ridge. The pole pieces 9a
and IDa corresponding to the different channels of the sound groove are formed by bending in
opposite directions. In this case, although the pole piece paired with the pole piece 9a and the
pole piece paired with the pole piece 10a are omitted in the drawing, they conform to a known
45-45 system together with the front pole piece. It is oriented n. Thus, in the four pieces of pole
pieces oriented n, the two hole pieces 7 arranged on the upper side (the pole piece 9a
corresponds to one of the seven in the drawing 4). ) And the lower side (the two pole pieces (in
FIG. 1, the pole piece 10a corresponds to one of the pole pieces 10a in FIG. 1). The tip of) is
generally located on the same plane. A magnetic gap formed by the plane of the upper pole piece
and the tip of the lower pole piece on the bottom of the main body 1 of the IJ flange 1 Will be
provided. In this embodiment, although the upper pole piece and the lower pole piece are
described as being bent in the directions facing each other, the front force of the upper pole
piece and the lower pole piece gold body 1 is described. It may be bent in the same direction
along the direction. In this case, however, the upper pole piece is constructed to have a long
dimension relative to the lower pole piece.
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A substantially bowl-shaped deep soil receiving portion 11 is formed in the rear portion of the
base weir, and this engagement receiving portion is provided with an engagement recess 12 at
the open end of the front portion 511. ing. Further, at the lower part of the 1iil side wall surface
of the housing 6, a locking portion 16 is formed. The knob member 2v, the knee, and the lower
part side of the main body 1 are fitted with a synthetic resin frame 14 having an overall shape to
obtain fitting tL, and the inner surface side upper part of the front wall of the frame 14 is for
locking. After passing over the portion 13, the housing 3 is retained 6-6. A convex portion 15 is
formed to stop. On the other hand, the rear wall of the frame 14 is provided with a convex
locking member 16 having a shape conforming to the shape of the locking recess 12. When the
convex locking member 16 is engaged in the locking recess 12 and the frame 14 is rotated
upward as the fulcrum point t′′LL, the convex portion 15 of the front wall is the locking step
16. The frame 14 is fitted on the bottom surface of the main body 1 in a reliable and accurate
position. In the positional relationship in this case, a needle assembly 17 having a single
columnar armature is provided on the frame 14 corresponding to the air gap formed on the
bottom surface of the main body ↓, 1. The needle assembly 17 is, as is known, a cantilever 19
having a needle tip 18 at its tip, a columnar magnet (armature) 20 collected at the rear end of
this force> 'lever, and a cantilever The Lft damper 21 (formed on a working point) is
accommodated in the metal sleeve 22. Reference numeral 26 is a hole drilled in front of the
frame 7-- in order to make the irradiation light and reflected light of the sound groove 1 stealing
device be uniform; 24 is the inner wall surface of the housing 5; It is a projection for positioning
inserted between the shield cases 8. The magnetic circuit of this cartridge will be described.
Assuming that the magnetizing direction of the columnar magnet 20 is N pole in the front and S
pole in the back, the magnetic flux is S pole from the tip of the lower pole piece paired with the N
pole, pole piece 9-yoke 9 and pole piece 9a. The magnetic circuit back to the flume, also 1 · wood,
the upper hole piece paired with the pole piece 10a, the yoke 10, the pole piece 11. The
magnetic circuit from the tip of a to the S pole returns the magnetic flux flow in the magnetic
circuit by the daytime work of the magnet 20 received from the left and right channels of the
stream n1 sound groove, and the sound recorded in the sound groove is Pick up. As described
above, according to the present invention, the locking member 16 of the knob member 2 is
engaged with the recess 12 of the main body 1 ('(engaged, the knob member 2 is pivoted about
that point as a fulcrum, the locking step As a result of the snap action of the portion 13 and the
convex portion 15, the knob member 2 can be mounted on the bottom of the main body 1
securely and in the positive 44 th position, and in the case of this 8-wedge, the knob member 2 is
supported n The needle groove body 17 is inserted and arranged in the magnetic gap from a
direction substantially orthogonal to the axial direction of the columnar magnet (armature) 20.
Therefore, a certain needle tip position can be secured even when changing the needle, and in a
single columnar armature type cartridge incorporating a sound groove reader, the sound groove
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a, the pick position color needle tip Can be kept as small as possible and constant.
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