JPS60182583A - Head serching method of cassette tape recorder - Google Patents

Abstract

PURPOSE:To search a head of a tape with high reliability and accuracy and little abrasion of a reproducing head by winding a tape in fast forwarding in the condition, where the reproducing head is under non-contacting state, by causing the head to be allowed to contact with a tape when a counted value of rotational frequency of a reel shaft becomes coincident with a set value and by heading a position signal. CONSTITUTION:When a signal in the desired position is inputted from a reference position, a control circuit 8 generates setting position information from the position information a certain amount before the head serching position and stores it in a memory 11. By reproduction instructions of a tape the control circuit 8 clears a counter 7, separates a reproducing head 9 from a tape through a head drive mechanism 10 and fast winds a tape through a motor 3. The rotation of a reel 1 is detected by a rotary encoder 6 and counted by the counter 7. The control circuit 8 causes the head 9 to be allowed to contact with a tape when a set value of the memory 11 becomes coincident with the counted value and to reproduction-travel steady at the time of detecting a position signal. Thus the head serching with high accuracy and reliability and little abrasion of a reproduction head can be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a cassette tape recorder cueing method for cueing a cassette tape on which audio is recorded, for example, in an answering machine.

[Technical background of the invention and its problems]

Conventionally, many methods of this type have been used, such as counting the number of rotations of the reel shaft using a mechanical counter, and stopping the cassette tape when this count reaches a target value to locate the beginning of the cassette tape. It is being However, with this conventional method fd, if the surrounding environmental conditions such as ambient temperature and humidity change, and the diameter of the reel shaft or tape length changes as a result, the counted value and the actual cue position no longer correspond. This has the disadvantage that accurate cueing cannot be performed.

On the other hand, as another conventional cueing method, there is a method in which a specific position signal is recorded at a desired position on a cassette tape, and cueing is performed by reproducing and detecting this position signal.

According to this method, since the position signal inserted at the cue position is directly detected, it is possible to always perform accurate cueing without being affected by changes in the surrounding environmental conditions. can.

However, this method requires that the reproducing head be kept in constant contact with the tape surface in order to reproduce the signal. As a result, the playback head suffered severe wear and the reliability of the cheap record was low.

[Purpose of the invention]

The present invention provides a method for locating the cue of a cassette tape recorder that can perform cueing with high precision without being affected by surrounding conditions, and can improve reliability by reducing wear and tear on the playback head. The purpose is to

[Summary of the invention]

In order to achieve the above object, the present invention first runs the tape in fast forward mode with the playback head in a non-contact state, counts the number of rotations of the reel shaft in this state, and calculates this counted value to a position a certain amount before the target position. The playback head is then brought into contact with the tape and recorded at the target position on the tape, a certain position signal is detected by playback, and at this point of detection, The tape is constantly played back.

[Implementation sequence of the invention]

FIG. 1 is a schematic diagram of a cueing device for carrying out a cueing method according to an embodiment of the present invention, and in the figure, reference numerals 1 and 2 respectively indicate reel shafts of a cassette tape recorder.

These six gear axes.

2 is selectively driven at a predetermined speed by transmitting the power of the motor 3 via a drive mechanism (not shown) comprising an idler pulley or the like.

Now, one of the reel shafts 1 and 2, I, is
It is connected to a pulley 5 via an unbraided belt 4, and this pulley 5 is provided with a rotary encoder 6.

This rotary encoder σ outputs one pulse every time the reel shaft 2 rotates once, and this pulse is supplied to the counter 7. This counter 7 counts the pulses and outputs the counted value to the control circuit 8.

By the way, this control circuit 8 is equipped with a microprocessor as a main control section, and this main control section (CPU
) controls the beginning of the cassette tape. In the figure, 9 indicates a playback head, io indicates a head drive mechanism for moving the playback head 9 toward and away from the tape according to commands from the control circuit 8, and 11 indicates a memory for storing cue target values, etc. ing.

Next, a cueing method for this embodiment will be explained based on the above configuration. Note that FIG. 2 shows the control procedure of the control circuit 80.

A cassette tape records a signal in which a position signal (for example, a silence signal of a predetermined length) is inserted at the beginning of the recording signal that requires cueing. Information corresponding to the distance from the returned state) to the desired position signal insertion position is manually input using a key switch or the like. Then, the control circuit 8 creates drink 4" information corresponding to a position a certain amount before the cue position from the input cue position information, and stores this in the memory 11 as the cue target value N. Remember.

Now, when a tape playback command arrives at the control circuit 8 in this state, the control circuit 8 first clears the count value of the counter 7, and then drives the head movement @ mechanism 10 to turn the playback head 9. away from the tape. Then, while fanning the motor 3, the drive mechanism is appropriately controlled to rotate the reel shaft, thereby causing the tape to be fast-forwarded. Then, the rotation of the reel shaft 1 is detected by the rotary encoder 6, and the number of rotations is counted by the counter 7. Control circuit 8
monitors the count value of this counter 7, and calculates this count value CT
When N becomes equal to the target value N stored in the memory 11, it is recognized that the tape has reached a position near the target position, and the head drive mechanism IO is driven to bring the playback head 9 into contact with the tape surface. . In other words, it is in a replay state. After that, the tape's re-'IE signal is monitored, and when position (No. 3) is found in this signal, it is determined that the cue has been found, and the drive mechanism (not shown) of the reel shaft is driven. The tape is controlled to shift to regular playback running, thus completing cueing.

In this way, in the cueing method of this embodiment 1+, the tape is fast-forwarded by monitoring the rotational speed of the reel shaft 1 until it reaches a position a certain amount before the cueing target value 1, and the above-mentioned target position is kept constant. After reaching the position before the target position, the target position is cued up by detecting the position signal recorded on the tape, so the playback head 9 does not touch the tape surface until it reaches the position before the target position. There is no longer a need to
As a result, wear on the reproducing head 9 can be significantly reduced. Please note that the final cue is performed by detecting the position signal recorded on the tape even in the trench, so accurate cueing can be performed without being affected by the surrounding environment. .

Note that the present invention is not limited to the above embodiments. In the above implementation, in step 1j, either the playback head 9 was brought into contact with the tape with the same pressure as in the normal playback state after the target setting value N was reached, or the target setting value N was reached and at point c. The playback head 9 is brought into contact with the tape in such a way that it does not interfere with the playback of the position signal, and the playback head 9 is pressed with a relatively large pressure so that the steady playback state is established when the position signal is detected. It may be made to contact the tape. In this way, wear on the reproducing head 9 can be further reduced. In addition, the method for setting the target value, the means for detecting the rotational speed of the reel shaft, etc. can be modified in various ways without departing from the gist of the present invention.

〔Effect of the invention〕

As described in detail above, the present invention first feeds the tape by detecting the rotational speed of the reel shaft with the playback head in a non-contact state until a certain distance before the target position, and then brings the playback head into contact with the tape and positions the tape. Although there has been a system that locates the beginning of a tape by detecting a signal, the present invention is capable of performing high-precision beginning without being affected by the surrounding environmental conditions, and also reduces the wear of the playback head. It is possible to provide a cueing method for a cassette tape recorder that can reduce the noise and improve reliability.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a cueing device g for carrying out a cueing method for a cassette tape recorder in one embodiment fl of the present invention, and FIG. 2 is a flowchart for explaining the cueing method of the same embodiment. be. 1.2... Reel axis, 3... Motor, 6... Rotary encoder, 7... Counter, 8... Control circuit, 9... Playback head, IO... Head drive mechanism, 1
1...Memory. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] In a cassette tape recorder cueing method in which a cassette tape is cued by inserting a specific position signal into a recording signal and detecting the playback of this position signal, the cassette tape is fast-forwarded with the playback head in a non-contact state. In this state, the number of revolutions of the reel shaft is counted, and this counted value is compared with a set value set corresponding to a position a predetermined amount before the target position, and when the two match, the playback head is brought into contact with the cassette tape. A method for finding the beginning of a cassette tape recorder, characterized in that a position signal is detected by detecting a position signal, and the cassette tape is made to run for regular playback at the time when this position signal is detected.