JPH01159883A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To properly and easily know the proper abrasion necessary time of a reproducing head by providing a means to decide whether a reproducing level attains to a prescribed level or not, and displaying a non-attainment when a decision result is the non-attainment. CONSTITUTION:In a magnetic tape, a part exists in which the signal of a frequency band specified in a specification according to the kind of a magnetic recording and reproducing device is recorded. At the time of reproducing the signal, the reproducing signal level of the part and a specification level or a level set beforehand in a range to satisfy the specification value are compared, and when the reproducing signal level is made into the normal level or set level or below, characters of 'cleaning (square form of Japanese syllabary)' is displayed 3 in a displaying part 2. Thus, the lowering of the reproducing level due to the stain of the head can be known, and a user can be alarm- informed of the necessity of the abrasion of the reproducing head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to magnetic recording and reproducing devices such as video tape recorders and digital audio tape recorders.

[Prior Art] Fig. 4 is a perspective view showing the internal structure of a conventional magnetic recording/reproducing device.
(4) is a supply reel, (12) is a take-up reel for magnetic tape (+04), (13) is a running guide for magnetic tape (104), (14) is a tension control guide for magnetic tape (104), (! 5) is a guide roller, (16) is a slant guide, (22) is a capstan shaft, and (23) is a pinch roller, and these components constitute the running system of the 8i tape (104).

(17) is a rotating drum, which has a tape guide lee 1' (19) on its periphery. (20) is the erase head, (
21] is a fixed head, and (18) is a magnetic reproducing head, which repeatedly slides and scans the surface of the magnetic tape (104) obliquely. (24) is a tape cassette.

Next, the operation of the above configuration will be explained.

As illustrated in No. 31-J, a cassette (24) having a magnetic tape (+04) on which a signal (tOS) is recorded on a track inclined with respect to the longitudinal direction is loaded.
The vehicle is driven to travel by the traveling system components described above. Then, the reproducing head (18) repeatedly slides and scans the surface of the magnetic tape (+(+4)) diagonally to record the recorded signal q-ctos.
) is read and played. By capturing the level of this reproduction signal with the user's own senses such as auditory or visual sense, the degree of wear of the reproduction head (18) and whether or not polishing is necessary can be determined.

[Problem to be Solved by the Invention 1] In the conventional magnetic recording and reproducing device configured as described above, the time when the reproducing head, which wears out over time with use, needs to be polished is determined by the user's own auditory or visual perception. Since it is necessary to make a judgment based on the following information, the judgment may vary depending on the user, leading to problems such as missing the appropriate timing and causing premature damage to the tape.

This invention was made in order to solve the problems as described in L.It is an object of the present invention to provide a magnetic recording and reproducing device that allows the user to accurately and easily know when the reproducing head needs to be properly polished. purpose.

[Means for Solving the Problems] The magnetic recording and reproducing apparatus according to the present invention is provided with means for determining whether the reproduction level has reached a predetermined level,
The present invention is characterized in that, when the judgment result is negative, a display child character is used to display this fact.

[Function] According to this invention, when a signal is reproduced, its reproduction level is compared with a predetermined level, and when it becomes less than the predetermined level, it is displayed, and the user does not have to look at the display. You can know when it is necessary to polish the remanufactured head.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described based on the drawings.

FIG. 1 is an external view of a magnetic recording/reproducing device according to an embodiment of the present invention, viewed from the front, and in the figure, (1) is
The body (2) is a display section formed in the shape of a window, and this display section (
Inside 2), there is formed a portion (3) that displays a warning message indicating that head polishing is necessary, such as the words "cleaning", when the time when polishing of the regenerated head is reached. (4) is tape cassette input slot, (5) is fast forward,
This is a button switch that selects and operates operations such as rewind, playback, and recording.

FIG. 2 is a block diagram showing the inside of the magnetic recording/reproducing apparatus shown in FIG. be.

The magnetic tape (104) has a portion in which signals in a frequency band defined by a standard depending on the type of magnetic recording/reproducing device are recorded at a standard level. When playing a signal, compare the playback signal level of that part with the above standard level or a preset level within a range that satisfies this standard value, and check whether the playback signal level is below the specified level or the set level. At this time, for example, as shown in FIG. 1, the words "Cleaning" are displayed in the display section (2). This makes it possible to detect a drop in the reproduction signal level due to clogging of the head, and to notify the user of the necessity of polishing the reproduction head (18).

The internal structure of the magnetic recording/reproducing apparatus of the present invention is the same as that of the conventional example shown in FIG. 4, so illustration thereof is omitted.

Furthermore, since the reproduction operation in its internal structure is the same as that of the conventional one, its explanation will be omitted.

[Effects of the Invention] As described above, according to the present invention, when the reproduction signal level falls below a predetermined level during reproduction, the corresponding content can be displayed to clearly notify the user. The user can accurately and easily know the appropriate timing for polishing the reproducing head. This has the effect that it is possible to always use a playback head with little wear to ensure reliable and clear playback, and it is also possible to suppress damage to the tape.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the external appearance of a magnetic recording/reproducing device according to an embodiment of the present invention, FIG. 2 is an internal configuration diagram of the device, FIG. 3 is a signal diagram of a magnetic tape, and FIG. 4 is a conventional magnetic recording device. FIG. 3 is a perspective view showing the internal structure of the playback device. (1)...Body, (2)...Display section, (3)...
Warning display part, (18)...Playback head, (24)
... tape cassette, (25) ... signal comparison circuit section, (104) ... magnetic tape, (ios) - ... signal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) It is characterized by comprising means for determining whether the reproduction level of a signal recorded on a recording medium has reached a predetermined level, and a display means that operates when the determination result is negative. Magnetic recording and reproducing device. (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the display means is configured to visually display the necessity of polishing the magnetic reproducing head.