JPH0276187A - Rotary head type tape player - Google Patents

Abstract

PURPOSE:To obtain a highly accurate searching operation by providing a recording/reproducing drum being equipped with a recording/reproducing magnetic head and a searching drum being equipped with a searching magnetic head to scan with making contact with a sub-code area. CONSTITUTION:The information of a main data area is mainly read by a recording/reproducing magnetic head 33 provided at a recording/reproducing drum 30. At a searching drum 40, magnetic heads 44a and 44b to scan only sub-code data along the scanning direction of a magnetic tape T are provided, and by the searching magnetic heads 44a and 44b provided at the searching drum 40, the sub-code data on approximately the whole tracks can be read. Thus, the accurate searching can be executed.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a rotary head type tape player that uses a rotary magnetic head other than a recording/reproducing magnetic head to enable high-speed searching.

[Conventional technology]

Figure 7 shows a magnetic tape T used in a conventional rotary head type DAT (digital audio tape player) etc. from the outside of the drum winding. FIG. In this type of tape player, a magnetic head for recording and reproducing mounted on a rotary head drum scans the recording surface of the magnetic tape T in the direction shown by an arrow α, and writes or writes information to a track shown by reference numeral 1. Regeneration takes place. Next, regarding a high-speed search operation, one example of this high-speed search operation is a method of reading data recorded in a subcode area. FIG. 7 shows a case where the tape is run at high speed in the REW direction (opposite to the recording/reproducing direction), and the rotary head drum is rotated at the same number of rotations as the recording/reproducing operation to perform a search. In this case, the magnetic head scans the magnetic tape at a shallow angle as indicated by arrow β in FIG. Mo and β
The subcodes recorded in the portions located in subcode areas 2a and 2b in each track are read by a magnetic head that scans along the locus of . [Problem N to be solved by the invention] However, in the conventional rotating head type DAT, the magnetic tape is wound around the rotating drum at an angle of about 9
Since the angle is 0 degrees, on the magnetic tape recorded in this manner, there are portions where information is recorded and portions where information is not recorded every approximately 90 degrees of rotation of the rotating drum. 7th
In the figure, the hatched areas are areas where information is recorded, and the other areas are areas where no information is recorded. When a magnetic head is scanned by a trajectory indicated by β on a magnetic tape in which recorded areas and non-recorded areas are arranged alternately in this way, even if this trajectory β scans an area other than the hatched area, , the data recorded in subcode area 2a or 2b cannot be read. In addition, by the magnetic head that scans along the locus shown by β, 3
The data in the sub-code written portions indicated by 8 and 3b will be read, but there is a track that is skipped between the track where the data in 3a is read and the track where the data in 3b is read. Therefore, there will be a section where the subcode cannot be read. In the actual DAT recording format, a "start ID" indicating the beginning of the song is written in the subcode writing part of each track.
It is possible to record subcodes such as J, "track number day i", and "time code". Among the above-mentioned subcodes, the "time code" is continuous data, so even if there are many tracks that cannot be read by the high speed β trajectory search as shown in FIG. 7, no problem occurs. However, "start IDJ is normally recorded for only 300 frames at the beginning of the song.
In the high-speed search shown in the figure, if the number of tracks that cannot be scanned by the head exceeds 300 frames, it becomes impossible to locate the beginning of the song. In addition, when performing a direct search for the target song number, the search operation is performed while monitoring the ``1 song number data'' during the high-speed search. Only the first 300 frames of this song number data are recorded. Therefore, if the high-speed search interval is 300 frames or more, direct search for the song number becomes impossible. In this way, if only the tape speed is increased, the subcode data may not be reliably read by the search operation, so there is a limit to how fast the search operation can be made.
For example, a DAT using a head drum with a diameter of 30 mm.
However, the limit is a high-speed search of approximately 250 times the speed. On the other hand, even if the tape speed during the search is kept as low as possible to ensure that the above data is read, the accuracy of data reading will be low because the subcodes in the subcode area are read by skipping them at intervals. , search errors are likely to occur. The present invention solves the above problems, and provides a rotary head type tape player that can reliably read data in the subcode area for each track and perform highly accurate search operations. It is an object. (Means for Solving the Problems) A rotary head type tape player according to the present invention has a magnetic head for recording and reproducing that contacts a magnetic tape pulled out from a cassette half and scans it at an angle with respect to the tape running direction. This is a rotary head type tape player that is provided with a recording/reproducing drum having a magnetic tape, and a search drum having a magnetic head for searching that contacts a subcode area of a magnetic tape and scans in a direction along the tape running direction. . Further, the rotary head tape player according to the present invention includes:
A search drum is provided with a search magnetic head that scans in a direction along the tape running direction by contacting the subcode area of the magnetic tape pulled out from the cassette half or exposed from the cassette half. [Operation] In the invention described first above, the information in the main data area indicated by the reference numeral 11 in FIG. 5 is mainly read by the recording/reproducing magnetic head provided on the recording/reproducing drum. Further, the search drum is provided with a magnetic head that scans only subcode data along the running direction of the magnetic tape. Therefore, the subcode data of almost all the tracks can be read by the search magnetic head provided on the search drum, making it possible to perform an accurate search. Further, according to the present invention, a rotary head type tape player is constructed which includes only a search drum. Only the subcode area of the magnetic tape is read by the search drum. This is effective, for example, when a magnetic tape contains not only music information, but also a large number of computer data files together with music information. In this case, the magnetic tape is loaded, and the search magnetic head provided on the search drum is used to create an information catalog, index, etc.
It becomes possible to read the contents at high speed in a short period of time. [Example] Examples of the present invention will be described below with reference to the drawings of FIGS. 1 to 6. FIG. 1 is a plan view showing a rotary head type tape player according to a first embodiment of the present invention. In FIG. 1, reference numeral 20 indicates a cassette half. Inside this cassette half 20, there is a take-up side tape reel Ra and a supply side tape reel R on which the magnetic tape T is wound.
h is stored. The tape reel drive unit into which the cassette half 20 is loaded is provided with a take-up reel stand 21a and a supply reel stand 21b, and each reel stand 21a and 21b can drive the tape reel Ra and Rb h< It looks like this. Further, reference numerals 22a, 22b, and 22c are loading posts, and the magnetic tape T is pulled out from inside the cassette half 20 by these loading posts. code 23
is a capstan, and 24 is a pinch roller. During recording/reproducing operations, the magnetic tape T is pressed against the capstan 23 by the pinch roller 24, and the magnetic tape T is run according to the rotational speed of the capstan 23. Further, reference numeral 25 is a tape tension control device. Reference numeral 30 is a recording/reproducing drum. This recording/reproducing drum 30 is used for the main data of the magnetic tape T and the ATF.
It is mainly used to reproduce data in a portion where data has been written (indicated by reference numeral 11 in FIG. 5). As shown in FIG. 2, this recording/reproducing drum 30 consists of a fixed drum 31 and a rotating drum 32.
1 has a magnetic head 33 mounted thereon. Two magnetic heads 33 are provided at an angle of 180 degrees, or four magnetic heads are arranged at an angle of 90 degrees. Note that this magnetic head 33
The number of is not limited to two or four. The rotation axis Oa of the rotary drum 32 is inclined with respect to the vertical line of the tape running direction, as shown by α in FIG.
The magnetic heald 33 scans diagonally with respect to the tape running direction, thereby enabling recording or reproduction on the track 10. Reference numeral 40 is a search drum. This search drum 40
are arranged side by side with the recording/reproducing drum 30. Third
As shown enlarged in the figure, this search drum 40 consists of a lower guide drum 41 that is fixed, an upper guide drum 42 that is also fixed, and a rotating rotary sandwiched between both guide drums 41 and 42. It is composed of a drum 43. The rotation axis ob of this rotating drum 43 is perpendicular to the running direction of the tape T. Two search magnetic heads 44g and 44b arranged in the axial direction are mounted on the rotating drum 43. One of the magnetic heads 44a scans the lower subcode area 12a shown in FIG. 5 along the tape running direction.
The upper magnetic head 44b is connected to the upper subcode area 1.
2b is scanned. As shown in FIG. 4B, the gap 45a of the search magnetic head 44a located at the lower side is set at a constant azimuth angle θ with respect to the track direction α (same as the direction of the arrow α in FIG. 5). is formed. On the other hand, as shown in FIG. 4A, the gap 45b of the upper search magnetic head 44b is formed at an opposite azimuth angle θ to the lower magnetic head 44a with respect to the track direction α. In FIG. 5, adjacent tracks 10 extending in the α direction are recorded at opposite azimuth angles, but the above-mentioned opposite azimuth gaps 45a and 45b are formed in two ways in the recorded tracks 10. The azimuth angle of Figure 5 shows the data recording format for DAT or equivalent magnetic tape, in the opposite direction from the side that contacts the drum (same direction as Figure 2).
FIG. A portion designated by reference numeral 13 in the center of the track 10 is a portion in which main data is written, and portions 14a and 14b on both sides thereof are portions in which ATF data is written. and 15
Portions a and 15b are subcode writing portions, and these portions are located in subcode areas 12a and 12b. Next, the operation will be explained. In FIG. 1, when the cassette half 20 is loaded,
The magnetic tape T is pulled out by the loading posts 22a, 22b, and 22C and wound around the recording/reproducing drum 30 and the search drum 40. In the recording/reproducing operation, the magnetic tape T is sent out by the capstan 23, and as the rotating drum 32 of the recording/reproducing drum 30 rotates, the recording/reproducing magnetic head 33 moves the magnetic tape T in the α direction shown in FIG. scan. In the recording operation, recording is performed sequentially on tracks indicated by reference numeral 10. In the reproducing operation, the recording/reproducing magnetic head 33 sequentially scans the track 10, thereby performing the reproducing operation. Next, in the search operation, the magnetic tape T is FF or REW.
It is sent at high speed in the direction. Then, the rotary drum 43 of the search drum 40 rotates, the search magnetic head 44a scans the subcode area 12a of the magnetic tape T, and the magnetic head 44b scans the subcode area 12b along the tape running direction. Data in subcode writing portions 15a and 15b of track 10 is read. Subcode writing parts 15a and 15b
In addition to the parity, "start ID", "1st track number data", "time code", etc. are recorded as data. It is also possible to record various other data. The search drum 40 reads each of the above-mentioned data, and uses this to locate the beginning of a song or information. FIG. 6 shows a second embodiment of the invention. In this embodiment, only a mechanism for loading the cassette half 20 and driving the tape reels Ra and Rb, and a search drum 40 are provided. Also, in this case,
The loading amount of the loading posts 51a and 51b is small. In this device, information only in subcode areas 12a and 12b is read at high speed by search magnetic heads 44a and 44b provided on a search drum 40. Subcode writing portions 15a and 15 of each track 10
By recording catalogs, indexes, data indicating contents, etc. in B, even if the amount of information files is large, catalogs can be recorded quickly and quickly by using the tape player shown in Figure 6. can be read out. Note that the above embodiment is based on a DA in which music information is recorded.
It can be applied not only to T-type magnetic tapes but also to DAT-type magnetic tapes when data for various computers is recorded, or to devices that use magnetic tapes such as 8+om VTRs and VHS compact cassettes. It is. However, this is limited to when using an information recording format that includes a subcode area. (Effects of the Invention) As described above, according to the present invention, high-speed search can be performed with high precision and reliability.Furthermore, since the subcode of each track can be read by the search operation, the subcode can be recorded as a subcode. It is also possible to increase the content.Furthermore, a tape player equipped with only a search drum can read the recorded content of a magnetic tape at high speed in a short time. If both are installed, it becomes possible to simultaneously read data for the computer and read the catalog of the next tape to be read, making it possible to construct a device with increased versatility.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a rotary head type tape player according to a first embodiment of the present invention, FIG. 2 is a front view showing the drum and tape position, FIG. 3 is a front view of the search drum, and FIGS. Figure 4B is an enlarged view showing the azimuth angle of the head.
6 is a plan view showing a rotary head tape player according to a second embodiment of the present invention, and FIG. 7 is a plan view showing a high-speed search operation in a conventional rotary head tape player. FIG. T...Magnetic tape, 10...Track, 12a, 1
2b...Subcode area, 20...Cassette half, 30...Recording/playback drum, 31...Fixed drum, 32...Rotating drum, 33...Magnetic head for recording/playback, 40 ...Search drum, 41.42...
Guide drum, 43...rotating drum, 44a, 44b
...Magnetic head for searching. Figure 1 Figure 7 10 Procedural Amendments) November 21, 1985 Director General of the Patent Office Yoshi 1) Moon Yi Kari'-1
Display of the case 1986 Patent Application No. 227793 2 Name of the invention Rotating head tape player 3 Person making the amendment Relationship to the case Patent applicant address 1-7 Yukitani Otsuka-cho, Ota-ku, Tokyo 8 Details of the amendment From "However,..." on page 3, line 8 to "...this will not be possible" on page 4, lines 1 and 2.
Correct the sentences up to the following. "However, in conventional rotating head type DATs, the magnetic tape is wound around the rotating drum at an angle of about 9
0 degrees, and the rotating drum has a magnetic head of about 180 degrees.
Since the magnetic heads are arranged at an angle of 100 degrees, there are parts that the magnetic head hits and parts that it does not hit when the rotating drum rotates in high-speed search mode. In FIG. 7, hatched areas indicate areas that are contacted by the magnetic head during high-speed search, and other areas indicate areas that are not touched by the head during high-speed search. As described above, in conventional devices, there is a fairly large area that cannot be scanned by the magnetic head during high-speed search. ”

Claims (1)

[Claims] 1. A recording/reproducing drum having a recording/reproducing magnetic head that contacts the magnetic tape pulled out from the cassette half and scans at an angle with respect to the tape running direction, and a magnetic tape sub. A rotary head type tape player 2 comprising a search drum having a magnetic head for searching that contacts a code area and scans in the direction along the tape running direction; A rotary head type tape player comprising a search drum having a search magnetic head that contacts a subcode area of a magnetic tape and scans in a direction along the tape running direction.