Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Reexamination Certificate
2000-09-11
2002-08-06
Adams, Russell (Department: 2851)
Optics: motion pictures
With sound accompaniment
Common picture and sound record carrier systems
C352S027000
Reexamination Certificate
active
06429922
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a master negative film forming device, a master negative film forming method and a master negative film, and can be suitably applied to the case of recording digital audio data onto movie film for example.
BACKGROUND ART
Heretofore, as shown in
FIG. 8
, on movie film
1
, multiple frame pictures forming a series of moving pictures are recorded sequentially frame by frame, and an analog audio signal track
5
on which analog audio signals are recorded is formed along the internal part of one of two series of perforations
3
provided on both sides in the longitudinal direction of the film. In addition, a digital audio data track
4
on which digital audio data is recorded is formed along the external part of both perforations
3
.
As shown in
FIG. 9
, the digital audio data track
4
of this movie film
1
is composed of multiple blocks representing one bit data per one block, and comprised of line synchronization pattern
8
, tracking pattern
9
, main signal pattern
10
and azimuth detection pattern
11
.
The line synchronization pattern
8
is comprised of multiple blocks for 2 rows in the longitudinal direction of the film and shows whether signal elements exist or not in the main signal pattern
10
in a column direction perpendicularly intersecting to the longitudinal direction of the film. In the case of
FIG. 9
, two blocks in each column of the line synchronization pattern
8
are unexposed and this shows that signal elements of the main signal pattern
10
exist in each column direction.
The tracking pattern
9
is comprised of multiple blocks for four rows in the longitudinal direction of the film. And this is the checkered pattern showing the exposed part and unexposed part for 2 blocks in each column shifted by a half block with respect to each block of the line synchronization pattern
8
.
The main signal pattern
10
is formed of multiple blocks of eight rows in the longitudinal direction of the film on the same level as the line synchronization pattern
8
. Digital audio data is recorded on eight blocks in each column, and the azimuth detection pattern
11
for two rows of blocks having the same checkered pattern as the tracking pattern
9
is adapted to appear at the starting point of each frame picture
2
.
In such a digital audio data track
4
, guard band
12
having the prescribed width is formed in the row and column directions between blocks in the line synchronization pattern
8
, the tracking pattern
9
and the main signal pattern
10
, which prevents signal elements of a block from the interference (cross-talk) with those of the neighboring blocks in the row and column direction.
In the case of reproducing such movie film
1
, while the movie film reproduction device
15
runs the movie film
1
run in the direction shown by an arrow at the prescribed speed, as shown in
FIG. 10
, it radiates the light source light from the light source
20
to the frame picture
2
of the movie film
1
sequentially frame by frame to project it on a screen
22
as the moving picture via a lens
21
.
At the same time, the movie film reproduction device
15
radiates the light source light from the light source
23
to the digital audio data track
4
of the movie film
1
and captures the transmission light of the digital audio data track
4
at the readout timing when the guard band
12
of the tracking pattern
9
in the column direction becomes center in the light receiving area (
FIG. 9
) of the CCD camera
25
.
Then, the movie film reproduction device
15
outputs an output signal of the CCD camera
25
obtained via the tracking pattern
9
to the tracking adjusting circuit
26
. The tracking adjusting circuit
26
, forming a tracking control signal S
1
based on the output signal of the CCD camera
25
and by transmitting this to the CCD camera
25
, conducts the tracking adjustment in order that the ratio of upper two blocks of the exposed part and lower two blocks of the unexposed part become equal centering around the guard band
12
of the tracking pattern
9
in the column direction.
On the other hand, the movie film reproduction device
15
outputs the digital audio data of the main signal pattern
10
captured by the CCD camera
25
to a digital conversion circuit
27
while conducting the tracking control within light receiving area by the CCD camera
25
. And the digital conversion circuit
27
converts this digital audio data into an analog audio signal and after amplifying this to the prescribed level through an audio signal output circuit
28
, outputs sound from a speaker
29
.
The movie film
1
is a positive film to be formed by performing optical contact printing on master negative film and blank film which has no picture recorded thereon. Its forming process is that firstly digital audio data is recorded on master negative film at a prescribed gray value (recording density), and after, by performing the contact printing on the master negative film and blank film are contact-printed, the digital audio data is transferred to a positive film, which is blank film, at a proper gray value. Here, the gray value (density) is a value representing a degree of darkness of film. And the proper density is a value of the time when digital audio data to be optically transferred to positive film is recorded at such density as to be correctly read by the reproduction device, and is previously set taking the properties of negative and positive film, the size of digital audio data, the functions of the reproduction device and other conditions into consideration.
In practice, as shown in
FIG. 11
, the movie film forming device
40
runs a blank film on which nothing is recorded, in the direction shown by an arrow A and moreover, runs a negative film
31
on which digital audio data is recorded, in the same direction as the arrow A at the same speed, and radiates the light source light with the predetermined radiation intensity to the blank film
30
from the light source
32
via the digital audio data track in order to record the digital audio data onto the blank film
30
at the aforementioned proper gray value.
At this point, the movie film forming device
40
records the digital audio data on the blank film
30
and at the same time, runs the negative film
33
on which the still picture is recorded, in the same direction as the arrow A, and by radiating the light source light from the light source
34
to the blank film
30
via the frame of the negative film
33
, records multiple still pictures onto the blank film
30
frame by frame.
In this way, the movie film forming device
40
records still pictures and digital audio data on the blank film
30
to form a positive film
35
, and displays this on the screen as the movie film
1
via the movie film reproduction device
15
(FIG.
10
).
However, in the movie film forming device
40
having the aforementioned configuration, there are cases where printing is performed at a higher gray value (darker) than the proper value when the positive film
35
is formed. And this makes the contrast between exposed areas and unexposed areas clear in the digital audio data track
4
of the positive film
35
and increases the dynamic range.
In practice, as shown in
FIG. 12
, in the case where the positive film
35
is formed at the higher gray value than the proper value based on the master negative film
31
on which guard band
41
having the prescribed width are formed in the tracking pattern, the blur spread out from the exposed part including the guard band
12
of the positive film
35
to the unexposed part and thus the unexposed area is eroded by the blur.
In such cases, as shown in
FIG. 13
, a signal level in the tracking pattern
9
of the positive film
35
captured by the CCD camera
25
of the movie film reproduction device
15
(
FIG. 10
) drops to the level D, almost close to 0 because the area of unexposed part (easy to transmit the light) is decreased by the erosion of blurs.
Accordingly, the most of the unexposed part of the positive film
35
printe
Adams Russell
Crosby, Heafey Roach & May
Fuller Rodney
Sony Corporation
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