JPS5948852A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce surely the noise of modulation with simple constitution, by bringing a modulation noise reducing part which is driven by a driving part into contact with a tape in a record or reproduction time. CONSTITUTION:A scrape filter 15 serves as a modulation noise reducing part. The 1st and 2nd rolls 17 and 20 are attached pivotably to shafts 18 and 21 implanted on a base interlocking a head mechanism part. These rolls are rotated by a motor 27 via belts 24 and 29. In a record or reproduction mode, the filter 15 is brought into a contact with a tape 6. Thus the roll 17 is rotated. The insufficient damping of the roll 17 is compensated by the roll 20, and at the same time the roll 17 is rotated at a high speed to reduce the amplitude of vertical vibration of the tape 6. This device assures the reduction of modulation noises.

Description

[Detailed Description of the Invention] [A. Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device, and particularly to a magnetic recording/reproducing device that reduces modulation noise generated by vibrations of a tape, vibrations of a wow-flash-retard, a he-lid, etc. The present invention relates to a magnetic recording/reproducing device equipped with a modulation noise reduction section for the purpose of the present invention.

[Background of technology]

The compact cassette-reader tape recorder is a magnetic recording and reproducing device for audio signals, in which membranes are also widely used today, but its dynamic refrange is only 1 kHz even with the highest performance tape currently available. It is about 7 QdB at most, which is extremely narrow compared to the recorded Musi Recunece. In view of this, audio signals are sampled, quantized, and converted into digital signals.
Recently, a so-called I'CM (pulse code liquid m) magnetic recording and reproducing method and apparatus has been proposed, which avoids signal deterioration that accompanies magnetic recording and reproducing by recording such digital signals on a magnetic tape. .

When an analog signal such as an audio signal is converted into a digital signal, the amount of information increases to the extent that it cannot be recorded using the recording system of a conventional magnetic recording/reproducing device, so PCM signals are generally recorded at high density on magnetic tape. A method is used in which digital signals are distributed in parallel using multi-channel fixed helicopters with multiple trolleys.

However, when recording digital signals on or reproducing from a compact cassette lid using such a multi-channel magnetic read/write device, tape vibration, wow and flutter, and magnetic damage are caused more than by conventional magnetic recording/playback devices.・Modulation noise caused by lid vibration etc. becomes a problem.

[Eight days]

An object of the present invention is to provide a modulation noise reduction section that operates in conjunction with a recording or reproduction head mechanism section having a magnetic lead that contacts the tape, and a drive section that drives the modulation noise reduction section;
The present invention provides a magnetic recording/reproducing device in which modulation noise is reduced by bringing a modulation noise reduction section driven by a drive section into contact with a tape.

[Second example]

FIG. 1 is a diagram showing the positional relationship between the head mechanism section, modulation noise reduction section, and drive section of the magnetic recording/reproducing apparatus according to the present invention, and the cassette/lid tape; (1) is the cassette/lid main body;
31 is a reel shaft; in the figure, the reel shaft (2) is on the tape supply side, and the reel shaft (3) is on the tape winding side.

(41 (5) is a reel hub provided on the case/lid main body (1), which meshes with the reel shaft (21 (a+). (6) is the magnetic tape stored in the case/lid main body (1), ( 7
) is a supply-side pinch roller, (8) is a guide, and (9) is a supply-side capstan, which presses (pinches) the magnetic tape (6) together with the supply-side pinch roller (7) during recording or playback.
The rotation causes the tape (6) to run. 01) is a take-up side pinch roller, 01) is a guide, (12+ is a take-up side capstan, which presses (pinches) the magnetic tape (6) together with the take-up side pinch roller σ0 during recording or reproduction.
This rotation causes the tape (6) to travel in the direction of the reel axis (3). 03) is for erasing the information signal recorded on the magnetic tape (6) during recording. The lid and ring contact the magnetic tape (6) during recording or reproduction, and the information signal is recorded on the magnetic tape (6). Recording/reading for recording or reading information signals recorded on magnetic tape (6), (15
) is a scrape filter that serves as a modulation noise reduction section, and is a scrape filter that serves as a modulation noise reduction section. ) and comes into contact with the magnetic tape (6) during recording or reproduction. 06) is a drive unit that drives the scrape filter αω, which serves as a modulation and noise reduction unit.

Figures 2 (A) and (') are a plan view and a side sectional view showing the modulation noise reduction section, and α7) is installed on a base (not shown) that interlocks with the heliad mechanism section (not shown). The tenth roller is rotatably attached to the shaft 08) and comes into contact with the tape (6) during recording or reproduction. (19) is a groove formed on the side of the 10th U, and 00) is rotatably attached to the shaft (21) implanted in the base (not shown), and
20th La (branch) (23) with a larger diameter than 0-La (1 piece)
) is the groove formed on the side of the 20th-ra (20), (to)
is a belt that connects the 10th roller α force and the 20th roller (4), and is stretched between 24 (19)■ of both rollers αη (20). (4) is a shaft installed on a base (not shown) so as to regulate the running of the belt. The fin is the motor, ■ is the pulley attached to the rotating shaft of the motor (27), and @) is the belt for transmitting the rotational driving force of the motor surface to the scrape filter (15). 20) and the groove (support)).

Next, the operation of the apparatus of the present invention having such a configuration will be explained.

When recording or playing, the pinch roller (7)
lol, to erase/redo 03) and to record/play/redo (14)
The lid mechanism (not shown) is moved (7,
The pinch roller (71 (10)
The capstan (9) F+2+ to erase, the lid (13) and the recording/playback, and the lid 0 contact the tape (6) to enter the recording or reproducing state. At this time, since it is moved in the modulation direction, the first p-layer (17) comes into contact with the tape (6).

By the way, modulation noise is excited by the frictional force between the tape and objects that come into contact with the tape, such as heads, tape guides, etc., so in order to reduce the amplitude of vibration (that is, to reduce modulation noise), it is necessary to It is necessary to shorten the length of the nodes, increase the C vibration frequency, and increase the mechanical loss of the tape.

Therefore, as in the present invention, the tape (6) is
7), it is possible to reduce modulation noise, but the effect is not completely satisfactory. This is because the 10th roller (171) is a roller with a small diameter that can be inserted through a small window in the case/lito body, so damping is insufficient.

Therefore, in the present invention, by connecting the 20th la, which has a larger diameter than the 10th la, with the 10th la by a belt, the lack of damping is compensated for by the @20 la, thereby improving the modulation noise reduction effect. I try to let them do it.

By the way, when the recording/reproducing frequency is deep as in PCM recording/reproducing, the modulation separation frequency also becomes good, and as mentioned above, the modulation noise reduction effect can be sufficiently satisfied by simply bringing the roller into contact with the tape. isn't it. Accordingly, C1 of the present invention reduces the amplitude of the longitudinal vibration of the tape by rotating the 10th-ra of the modulation noise reduction section at high speed, thereby improving the modulation noise reduction effect.

[E-Effects of the present invention]

Modulation noise during recording or reproduction can be effectively reduced. This is particularly effective in reducing modulation noise when the recording/reproducing frequency is high. .

[Brief explanation of drawings]

Fig. 1 is a diagram showing the positional relationship between the head/lid mechanism section, modulation noise reduction section and drive section of the magnetic recording/reproducing device +7 according to the present invention, and the case/lid; and a plan view and a side cross-sectional view showing the drive section (Figure hj).

Claims (2)

[Claims] (1) When recording or reproducing information, a heliread mechanism section having a magnetic helide that comes into contact with the tape, a modulation noise reduction section that interlocks with the heliad mechanism section, and a modulation noise reduction section are driven. a drive section, and the modulation noise reduction section driven by the drive section contacts the tape during recording or reproduction to reduce modulation noise. Some place. (2) The modulation noise reduction section has a roller that comes into contact with the tape at least during recording or reproduction, and the drive section rotates the roller.
The magnetic recording and reproducing device described in 2.