Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1986-01-21
1988-07-12
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 93, 369119, G11B 2736, G11B 700
Patent
active
047574909
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to an information recording apparatus for exposing and recording an information on a film.
2. Background Art
As an information recording apparatus of this kind, there is known such one that exposes a sound signal on the sound track of a cinema film. The principle of the recording on the sound track is such that, as shown in FIG. 1, an optical image 1 having a triangular cross section is projected onto a slit 2 with a predetermined width to thereby form a linear exposing beam 3 by the light portion passed through this slit. Then, this exposing beam is irradiated on a sound track 4 as shown in FIG. 2. By moving the projected position of the triangular optical image 1 onto the slit 2 in the arrow 5 direction perpendicular to the slit 2 in response to the sound signal, the width of the exposing beam 3 is changed in accordance with the sound signal whereby, as shown in FIG. 2, an exposed locus 6 the exposed area of which is being changed in response to the sound signal is formed on the sound track 4 of the film.
By the way, in practice, in order to control the projected position of the triangular optical image 1 onto the slit 2 to be varied in response to the electrical sound signal, there is used a reflection apparatus of a galvanometer arrangement, in which the triangular optical image 1 emitted from the light source is reflected to become incident on the slit 2 by a reflection mirror which is mechanically rotated. The information recording apparatus including such mechanical system has a problem that it can not respond satisfactorily to the sound signal of a relatively high frequency region. In order to solve this problem, the prior art sound track recording apparatus is provided with an equalizer to increase the response property in the high frequency region as shown by a curve in FIG. 3 to thereby compensate for the response property in the high frequency region. However, from a practical arrangement, it is difficult to set this compensation to match individual characteristics of the mechanical system. In practice, the operator is always required to carry out a fine adjusting operation, which is very troublesome.
Normally, the mechanical system has a mechanical resonant point in a high frequency region (substantially in a range from 12 to 13 kHz). Accordingly, if an electrical input signal has a frequency component close to this resonant point, there occurs the fear that the mechanical system will resonate and hence the movable range of the triangular optical image 1 is expanded beyond that of the slit 2. This problem could be solved by the operator when he adjusts the recording level of the electrical input signal on the basis of his past experiences.
At any rate, the prior art information recording apparatus is not so arranged that it can check whether the signal level of the electrical input signal is a proper value or not. As a result, the adjusting work of the operator to provide a proper recording level was very difficult.
In view of the above mentioned points, this invention is made which is intended that when the signal level of an electrical input signal indicative of an information to be recorded exceeds a proper range, this can be properly detected by the operator.
DISCLOSURE OF INVENTION
According to this invention, there is provided an abnormality detecting circuit which compares a scanning width signal with an upper limit setting signal and a lower limit setting signal and detects that a scanning width indicated by the scanning width control signal becomes larger than an upper limit scanning width indicated by the upper limit setting signal or becomes smaller than a lower limit scanning width indicated by the lower limit setting signal, whereby when a signal level of an electrical input signal indicative of an information to be recorded exceeds a proper range, this can be accurately known to the operator.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a schematic diagram showing a principle structure of a prior art sound track recording ap
REFERENCES:
patent: 1975279 (1932-07-01), Lindenberg
patent: 2224914 (1940-12-01), Kreuzer
patent: 2468047 (1945-11-01), Dimmick
patent: 3197574 (1965-07-01), Zane
patent: 4076969 (1978-02-01), Sacks
patent: 4087651 (1978-05-01), Taneda et al.
"Improved Noise-Reduction System for High Fidelity Recording", JMPE, vol. 29; No. 3, Sep. 37; pp. 310-316; Hasbrouck et al.
SMPTE Journal Article (Mosely et al.), vol. 87, No. 4, 1978.
Ozaki Yoshio
Shirai Hidemichi
Eslinger Lewis H.
Psitos Aristotelis M.
Sony Corporation
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