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(2000 yen) · 1) Patent office director 1 name of the invention 3 inventor 4% applicant address
Address in Osaka Prefecture Kadoma city Ogata Kadoma 1006 Name (582) Matsushita Electric
Industrial Co., Ltd. Representative Masaharu Shishita 6 Agent 671 Address Osaka Prefecture
Kadoma City Ogata Kadoma 1006 4-066 ', II + Specifications [Japanese] [Japanese] Japanese
Patent Office ■ JP 50-j-59303 ■ Japanese Patent Application No. 4 C 乙 乙 q / 乙
7472361.10f7 converted confectionery (・ ・ ・ The reproduction back 1 which reproduces the
41 information signal, name of the invention 1, name of the invention signal conversion element
Number of Inventions Described in Claim 2
3. Detailed Description of the Invention The present invention relates to the signal conversion
element which records a clear signal such as a video signal as a mechanical asperity on a
recording medium and uses the signal from the recording medium. . Conventionally, as recording
/ reproducing apparatuses of this type, there are usually 'LP's and' c · 1 ··· audio records which
have been separated. Recently, instead of audio, attempts have been made to record / reproduce
video signals with a similar configuration. ing. The video signal needs to be recorded and
reproduced up to 14 waves higher than the audio signal, and inevitably the relative speed
between the recording medium and the signal conversion element is 3 m / s θ C -20? It becomes
as large as I + / 8eO, and the above-mentioned unevenness becomes high density. As a result, the
contact between the light emitting element and the recording medium at the time of
reproduction becomes unstable, and at the same time, the very small dust on the recording
medium becomes a problem. The present invention provides a means for solving this problem,
and one embodiment will be described below with reference to the drawings. First, the video
signal to be recorded is subjected to FM modulation. Its carpet frequency is 4, 3-4.3 MH2. The
audio signal is also subjected to Fbl modulation at a carrier frequency of 200 EndPage: 1 KHZ.
The two are mixed to perform duty cycle modulation. Then, this modulated signal is cut into the
original plate as described later. On the other hand, the shortest recording wavelength that can
be reproduced using a reproduction needle using a piezoelectric element was about 0.5 μm in
the inventor's experiment, and the minimum recording groove diameter of the disc was about 4
μm. Therefore, by setting the final shape of the video disc to an outer size of 30CIlφ and a
thickness of 0.8 to 2mm, the same as the P record, and setting the rotation speed to 45QfpIn,
color video and audio signals of 30 minutes on one side and 1 hour on both sides can be
reproduced. You can make a video disc. The photoresist is coated with an electron beam-sensitive
photoresist, which is subjected to the above FM signal while the electron beam is shaken at right
angles to the length direction of the skin in true nitrogen. . The electron beam is controlled so
that its center always coincides with the center of the groove. Thereafter, when this photoresist is
developed, the electron beam strikes in four parts. FIG. 1 is a top view of the development
pattern. In the figure, 1 is a signal four portion engraved by the electron beam exposure, and 3 is
a residual photoresist. FIG. 2 is a cross-sectional view of the groove cut at 8-A ′ in FIG. In FIG. 2,
4 is the top of the groove, the deepest part of the 8 groove, 6 is the profile of the abovementioned embedded signal 1, 3 residual 1 photoresist, 6 negative metal substrate.
FIG. 3 is a longitudinal sectional view of the groove cut along B-B 'of FIG. Each part in the figure
corresponds to FIG. The depth to which the signal is colored is, for example, 0.15 μm. From this
original plate, it is possible to produce a joined vinyl video disc made of hatched vinyl in the
same manner as the well-known method of producing audio records. Reproduction of such a
video disk is carried out by means of a reproduction needle of a hard material such as diamond
as shown in FIGS. 4 and 6 and a pressure "#" attached to the top of the reproduction needle. In
FIGS. 4 to 6, it is the apex 1 o of the triangular pyramid formed by the surfaces 14, 15 and 16
that scans the surface tetic plate in which the surface 9 engages with the pressure quadruple. In
Figure 7.8.9, 17 is the scanning plane, and the example of the size of this triangle is 200 μm, 2
μm, and 19 μm longer than 20. Is most preferably 3 μm. Since the upward direction of the
disk is the direction of the arrow 18, the recording signal will run from the apex 19 of the
triangle of the scan plane to the trailing edge 20. Needle pressure is around 30 trb ha. Signal
generation is performed by changing the force or area of the disc signal in contact with the
reproducing needle. As described above, in the signal conversion element of the present
invention, the width of the running cover surface 17 in contact with the recording medium in the
direction perpendicular to the moving direction of the recording medium has an increase 91 of
the recording medium penetration 91 (from I 119 toward the I exit 20 It is possible to expect the
traveling accumulated in the signal groove stably. As the material of the above-mentioned disc,
the resin content is about 93%, the plasticizer is about F54, and the resin content is mainly vinyl
chloride, When vinyl acetate is used for about 14 ordinary voice records in the resin part, contact
of the playback needle with the signal recording section by a strip of disc material scraped off
from the disc by the playback needle during the experiment. Become unstable, causing a lot of
noise and loss of appearance in the reproduced image. This phenomenon is considered to be
caused by the fact that the present system makes contact with the signal at the bottom of the
reproducing needle as described above and does not make contact at the side as in the case of
the i-voice cord. The inventor made a first look at the shape of the reproduction needle and
experimented variously, the entry angle of the reproduction needle to the disc, Fig. 5. 23 in FIG. 8
is highly relevant. つ き 種 々 針 即 13 13 13 13 13 13 13 13 13 13 13 13 13 13 13 角度 角度
角度 角度 角度 角度 角度 角度 角度 角度 角度 角度 〜 角度 角度 ′ 附 46 46 ′ 特 に 特 に @ 雑
雑 @ @ 生 出 出 出 出 出 出It turned out that it is small and effective and easy to manufacture. If
this is further explained in an enlarged view, it means that the angle 21 formed by the scanning
surface 17 and the triangular pyramidal ridge line 22 in FIG. 8.9 is set to 1600 or less.
By this configuration, a stable contact between the signal conversion element and the recording
medium can be obtained, and the present invention is particularly effective when used for a video
disc having a high relative speed and a large recording density. It is. EndPage: 2
4. Brief description of the drawings Fig. 1 is a partial top view of a video disc to which the
present invention is applied, Fig. 2 is a plan view taken along line A- in Fig. 1, and Fig. 3 is FIG. 4
is a rear view showing an embodiment of the signal conversion element of the present invention,
FIG. 6 is a side view, FIG. 6 is a bottom view, FIG. The figures are enlarged views of the main
parts of FIGS. 4 to 6, respectively. 17 ····· Scanned surface. Name of agent Attorney Nakao et al. 1
person Fig. 6 Fig. 7 Fig. 7 Fig. 8 Fig. 9 Fig. 7 Attorneys other than the above Address address in
Osaka Prefecture Kadoma city Oda Kadoma 1006 EndPage: 3