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3. Patent applicant ■ Japan Patent Office published patent publication ■ JP 5Q 25205 [phase]
published Nissho 5Q, (1,975) 3.17 unclaimed examination request (all four pages) specification /,
軸 明Each name electric pickup
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an electric-electric
pickup according to an embodiment of the present invention, FIG. 2 is a plan view of a tatami mat
portion, FIG. Fig. 4 shows an explanatory diagram of the operation of the vibration system.
Detailed Description of the Invention The present invention is of a type in which a shutter
inserted between a light source and a photoelectric conversion element is vibrated according to
the sound groove of a record to change a member received by the photoelectric conversion
element and convert it into an electric signal. It relates to the pickup. The present invention
relates to a pickup that obtains a stereo signal with less of * CZW storter in such type of pickup.
1. In the form of 7 in the form of 2 ** v , the beam of light received by the 1st party is
converted into a pair of shutters which are parallel to the front wall of the stereo record. The
angle formed by the ridge is 9σ. However, as a result of research, it was found that crosstalk was
improved when the angle was changed rather than the angle when the shutter edge was parallel
to the sound groove wall section of the stereo record. That is, the vibration system shown in FIG.
1 and FIG. 1 as an example of the vibration system of the conventional pickup has the shutter
removed. FIG. S shows a side view of the vibration system, and FIG. In FIG. 5 and FIG. 5, D
indicates a damper, T indicates a dention wire, I indicates a cantilever, and N indicates a needle.
Further, o-o 'is a center line of the cantilever, which is an intersection point of o-o' and m-B11iI or
a point Cl in FIG. The needle N contacts the record tone groove at P / point of the tip, and traces
the record tone groove. Since the age band width of the record sound groove is one piece @ + oH, consider the case of (0) p- as an average value. It is assumed that the front end where only the
front half channel is noise is traced EndPage: 1 and the heavy-duty contact point P / comes in the
direction 1'1'J of the right upper arrow r. The ms-like pigeon follows the movement of the
contact point P / to P- of the needle point, and the intersection point C / is the upper right
everything J "CJr- moves in one direction, and in the actual case the needle point is the contact
point P / When moving to P λ, the cantilever fights the center @ 0-σ of the cantilever. A slight
rotational force is applied as a turning shaft. Therefore, when JO / A is moved up to the point of
contact P / P, the cantilever is rotated by JQ minutes-this degree of rotation can occur
sufficiently. ), 07 points move to c3. The angle between CI-CJ and CI-CJ is approximately de- gree
as determined from the drawing. Also, when P / moves to P3 in the lower left qj1 direction, CI is
not C4C (CJK moves) for the same reason as described above. In this way, the angle between the
tip of the needle N and the contact point P / of the recording sound groove is horizontal! Even if
it moves in the direction of, the cantilever moves in the direction of the angle Sj which makes a
horizontal. ものである。
In the figure / shows a light source consisting of a small incandescent lamp such as Bike Tran 1
and so on the back of the light source so that the light beam from the light source / is directed
efficiently to the direction of the charge conversion element and the parallel light beam reaches
It is a reflector that is curved qI # to be equipped like a m. J is a needle tracing a recording sound
groove, a cantilever is a cantilever with the needle 3 fixed at one end, 5 is a damper consisting of
an elastic body of rubber force deposited at the other end of the cantilever, t is the center of
gravity or near the center of gravity Shutter attached to the center of the cantilever by
penetrating the force lever, in the present invention, the bottom and oblique side of the shutter
weir? The angle between t and t is the direction in which the center line of the cantilever
operates; That is, the apex angle of the shutter is made smaller than the angle formed by the
sound groove walls of the stereo record. In the illustrated embodiment, the angle between the
side 7 and l is IO! It is being threatened. 10 is a light source / Ct4, a party consisting of solar cells
of a long reckoning arranged so that each side 7 and tIc of the light source / Ct4 are parallel to
each other and a part is 11 by the shutter 4, a conversion element, // is a mold Then, the charge
conversion element 9.10t-111cm is attached and fixed, and the reflecting plate-both m-are fixed,
and the reflecting plate co and the light source 1 are held at a fixed position. The damper S is
inserted into a through hole formed in the mold, and the cantilever is supported via the damper J.
/ J is a gonector for taking out the electric output, / * is the mold / /, with the connector 73 vtill
is a pickup cartridge * breaking shell with connector. The pickup according to the present
invention is formed into an IC 11 as described above, and when the needle 3 traces the record
sound groove, the electric movement of the sound groove is transmitted to the shutter 4 via the
cantilever and the shutter 1 is displaced to thereby convert the photoelectric conversion element
de, 10Ic. Change the amount of light received. This change in light quantity is obtained from the
charge conversion element 10 as an electrical remark. ili, record sound groove -1, i; = conversion
is converted in the middle of the electrical signal · 10 and edge 7. Since each sound groove mc of
the stereo record is formed, the sound groove waveform provided on each sound groove wall of
the stereo is divided by each charge conversion element and each side to obtain a stereo signal.
The present invention (the oblique side of the shutter shutter 7. The angle formed between the
base and the base is made equal to the angle between the direction of movement of the center
line of the cantilever q and the surface of the record board, so that the oblique side of the shutter
6 in advance 7 even if the cantilever has rotational movement. When r is tilted by the angle of
rotation by r, so that the sound of bellowed sound of only one channel is traced, the shutter 4
moves in a direction perpendicular to the oblique side for one oblique side, and the light
receiving element The amount is changed, and on the other oblique side, the shutter moves in the
direction of the oblique side and does not change the light reception amount of the charge
conversion element.
As a result, the amount of crosstalk decreases. This is apparent from the characteristic of FIG.
Referring to FIG. 3, the horizontal axis shows a frequency scale and the vertical axis shows the
crosstalk level EndPage: 2, 夷-is the line C of the record image, and the cross-talk level when the
side is S-111% The dotted line indicates a side line 35 v), and the alternate long and short dash
line indicates a line of +10 ′ ′ and electric −5 other a, o @, so 16 s ′, 4 o j. As apparent from
this characteristic am, as in the conventional one, the side 7 of the shutter 4. Since the syllable
NK-parallel of the lt-stereo record, that is, the lid groove of the stereo record is in the direction of
the record 51 m with respect to the record board m, the side 71. Cross talk is improved in the
range from 4 L / or less to 35 @ rather than making the angle formed by r smaller. Also, if the
vertical angle of the shutter is small, the crosstalk level will be minimized * a. It can be seen that
it is corrected accurately by making the apex angle of the shutter small.