JP2870070B2 - Recording and playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording / reproducing apparatus such as a VTR (Video Tape Recorder) having operation means such as a so-called jog / shuttle.

[Summary of the Invention] In the present invention, in a recording / reproducing apparatus such as a VTR, a tape stabilizer is attached to each of a mounting member arranged around a rotary head drum at a position on a tape entrance side and a tape exit side with respect to the rotary head drum. Thus, the vibration of the tape around the rotary head drum including the tape exit side is reliably prevented, and the problems such as jitter and color unevenness can be completely eliminated.

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No. Sho 64-21744 discloses a tape stabilizer that attenuates vibration of a tape at a tape entrance side of a rotary head drum of a VTR. This is
More specifically, referring to FIG. 5, reference numeral 100 denotes a U-loading type VTR, and a tape stabilizer 102 is provided on a tape inlet side A of a rotary head drum 101.
This tape stabilizer 102 is a rotary head drum 101
And a guide roller 104 having a large moment of inertia rotatably supported by a mounting member (not shown) provided on the tape inlet side A around the support shaft 103 via a support shaft 103.
Disk-shaped weight 105 detachably fitted to the upper part of
It is roughly composed of

Then, when the tape 106 on the tape entrance side A is brought into contact with the guide roller 104 and the tape 106 runs, the apparent tape mass becomes extremely large due to the moment of inertia of the tape stabilizer 102 being added to the mass of the tape 106. The vibration of the tape 106 is reduced.

[Problems to be Solved by the Invention] However, in the conventional VTR 100, since the tape stabilizer 102 is provided only on the tape entrance side A, the vibration of the tape 106 on the tape exit side B of the rotary head drum 101 is prevented. There were drawbacks that could not be done.

Therefore, the present invention provides a recording / reproducing apparatus capable of completely reducing the vibration of the tape around the entire rotary head drum including the tape exit side.

[Means for Solving the Problems] In a recording / reproducing apparatus in which a tape stabilizer is mounted at a position of a tape inlet side and a tape outlet side of a mounting member arranged around a rotary head drum with respect to the rotary head drum, The tape stabilizer on the side was formed to have a larger mass than the equivalent mass of the tape stabilizer on the tape exit side.

[Effect] The reduced jitter is removed by the tape stabilizer having a large equivalent mass on the tape entrance side with respect to the rotary head drum, and the high frequency jitter is removed by the tape stabilizer having the small equivalent mass on the tape exit side. As described above, oscillation is prevented by providing a difference in the equivalent mass of the tape stabilizer between the tape entrance side and the tape exit side.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an M loading type VTR (recording / reproducing apparatus). The apparatus main body 2 of the VTR 1 includes a flat rectangular frame 10 made of synthetic resin,
It is roughly constituted by an outer casing 3 and the like that cover. A tape cassette 70 is provided at the upper center of the front surface 2a of the apparatus main body 2.
And a cassette insertion slot 4 for inserting and removing
A digital display unit 5 and the like are provided below it. Recesses 2b and 2c are formed on both sides of the front surface 2a of the apparatus main body 2, respectively. On the inner surface of this one concave portion 2b,
Operation buttons 6 for rewinding, playing, stopping, etc. are provided, and these operation buttons 6 can be seen and hidden by an operation panel 30. On the inner surface of the other concave portion 2c, there are provided a power button 7, a cassette eject button 8, and terminals 9 such as a headphone input terminal and a line input terminal.
And the like are made visible and concealable by the lid 80.

As shown in FIG. 2, a substantially cylindrical mounting frame portion 11 is integrally formed so as to protrude substantially at the center of the frame 10 near the front. Concave portions 11a, 11b, 11c are integrally formed in the front right, left front, and rear center of the mounting frame portion 11 in the drawing. A rubber elastic member 12 is fitted to each of these times 11a to 11c. As shown in FIG. 3, a lower edge 15a of the chassis 15 is placed on the upper surface of each rubber elastic member 12 via a spacer 13. The rubber elastic member 12 and the spacer 13 constitute a buffer means (damper mechanism) 14. At a position near the concave portion 11c on the chassis 15, a rotary head drum 17 is rotatably supported via a drum mounting base (mounting member) 16, and slides around the rotary head drum 17 on the chassis 15. The tape 71 in the tape cassette 70 via a pair of slide bases (mounting members) 18
A guide 19 and a vertical guide 20 for pulling out and loading around the rotary head drum 17 are provided. In addition, a pair of reel stands 21 and 21 for mounting the tape cassette 70 are arranged on the front side of the chassis 15, and a capistan 22, a pinch roller 23 and the like are provided on the right side of the chassis 15 in the figure. It is arranged. The second and third
In the drawing, reference numeral 25 denotes a stop member for stopping a wire or the like.

The operation panel 30 stands and tilts in a range of about 90 ° in the front-rear direction via a shaft 32 on a base 31 having a protruding base end 30a side fixed to a lower portion of a recess 2b of a front surface 2a of the apparatus main body 2 via a shaft 32. It is supported so that it can rotate freely. An operation means 33 composed of a jog dial 33a and a shuttle ring 33b is rotatably supported substantially at the center of the inner surface of the operation panel 30. The jog dial 33a can freely move the image from frame advance to slow reproduction and standard reproduction in accordance with the speed, and can operate the image in the opposite direction depending on the turning direction. Also, the above shuttle ring
33b changes the reproduction speed in accordance with the size of the turned angle. By tilting the operation panel 30 forward about the axis 32 by 90 ° as shown by the dashed line in FIG. 8, the operation buttons 6 for reproducing the apparatus body 2 and the operation means 33 of the operation panel 30 Can be operated, and the operation buttons 6 and the operation means 33 can be hidden by raising the operation panel 30 as shown by the solid line in FIG.

As shown in FIGS. 4 to 7, a pinion 35 is mounted on one side of the base 31 so as to be constantly rotated by an oil damper 34 and rotate. Also, the operation panel
A fan-shaped gear 36 meshing with the pinion 35 is formed integrally with the pinion 35 at a position facing the pinion 35. The oil damper 34, the pinion 35, and the gear 36 constitute one buffering means (damper mechanism) 37.
Thus, the operation panel 30 can be smoothly tilted forward by 90 °.

As shown in FIGS. 4, 5 and 8, an inverted T-shaped projecting pin 41 projecting by a compression coil spring 40 is provided near the other side of the recess 30b formed on the back side of the base end of the operation panel 30. Is protruding. The compression coil spring 40 and the protruding pin 41 constitute another buffer means (damper mechanism) 42. When the projecting pin 41 of the buffer means 42 comes into contact with the front side of the base 31 when the operation panel 30 is tilted,
The operation panel 30 can be smoothly tilted forward by 90 °, and when the operation means 33 is operated, the operation panel 30
Vibration can be absorbed.

A pair of magnet receiving plates 38 are buried on both sides of the inner surface of the operation panel 30 on the distal end side. The pair of magnet receiving plates 38, 38
By magnetically attaching to the pair of magnets 28, 28 embedded in b, the operation panel 30 stands up and the state where the recess 2b is closed is maintained. On one side of the inner surface of the operation panel 30, operation buttons 39 such as a counter reset button are provided.

Further, as shown in FIGS. 2, 9, and 10, the slide base provided on the tape inlet side A of the rotary head drum 17 is provided.
A T-shaped tape stabilizer 50 is rotatably supported by the H-shaped tape stabilizer 60, and an H-shaped tape stabilizer 60 is mounted on the drum mounting base 16 provided on the tape outlet side B.
Is rotatably supported.

The T-shaped tape stabilizer 50 has a support shaft 51 erected on the slide base 18 and a sleeve-shaped guide rotatably supported on the support shaft 51 via a pair of oil-impregnated bearings 52, 52 in a ring shape. It is composed of a roller 53, a disk-shaped annular weight 54 fitted on the upper part of the guide roller 53, and a retaining washer 55 locked on the upper end of the support shaft 51.

The H-shaped tape stabilizer 60 is rotatably supported by a support shaft 61 erected on the drum mounting base 16 and a pair of ring-shaped oil-impregnated bearings 62, 62 on the support shaft 61. A thick-walled sleeve-shaped guide roller 63, and a resin-made circular disk-shaped lid fitted over the guide roller 63
64, and a retaining washer 65 locked to the upper end of the support shaft 61. Then, the equivalent mass (g · se) of the T-shaped tape stabilizer 50 on the tape inlet side A.
c ² / cm) is made larger than the equivalent mass (g · sec ² / cm) of the H-shaped tape stabilizer 60 on the tape outlet side B.

When the tape cassette 70 is inserted from the cassette insertion slot 4, it is held by a cassette holder (not shown) and mounted on the pair of reel stands 21, 21 of the chassis 15. The lid 80 has buttons 81 and 82 for operating the power button 7 and the cassette eject button 8, respectively. Further, similarly to the operation panel 30, a pair of magnet receiving plates 83, 83 are embedded on both sides of the inner surface of the lid 80 on the distal end side. The pair of magnet receiving plates 83, 83 are magnetically attached to the pair of magnets 29, 29 embedded on both sides of the concave portion 2c on the front surface 2a of the apparatus main body 2, so that the lid body 80 rises and the concave portion 2c The closed state is maintained.

According to the VTR 1 of the embodiment described above, when operating the jog dial 33a, the shuttle ring 33b, etc. of the operation panel 30 rotatably supported on one side of the front surface 2a of the apparatus main body 2, first,
A pair of magnet receiving plates 38, 38 are formed by the magnetic force of the pair of magnets 28, 28 embedded in the concave portion 2b of the front surface 2a of the device body 2.
Pull the upper part of the operation panel 30 magnetically attached through the front side. As a result, the operation panel 30 moves about 90 ° about the axis 32.
The inner surface of the operation panel 30 on which the jog dial 33a and the like are provided becomes horizontal as shown in FIG. On this occasion,
A base is provided between the front surface 2a of the device main body 2 and the operation panel 30.
Since the two buffer means 37 and 42 are interposed via the 31, respectively, it is possible to reliably absorb the vibration when the operation panel 30 is rotated forward about the shaft 32 and tilted, and the operation panel 30 The 30 does not jump up due to its weight or the like, but falls down smoothly. Further, when operating the jog dial 33a, the shuttle ring 33b and the like of the operation panel 30, the vibration of the operation panel 30 can be reliably absorbed by the two buffer means 37 and 42.

Also, as shown in FIG. 2, a chassis 15 having a rotating head drum 17 and the like, which is the heaviest part of the VTR 1, is installed at approximately the center of the frame 10 of the apparatus main body 2 via three buffer means 14. The left and right balance can be equalized, and the occurrence of twisting and the like can be suppressed. Also, comparing the vibration level that greatly affects the image quality and sound quality with that of a conventional VTR in which the mechanical chassis is biased to one side, the test results shown in FIGS. 12 and 13 were obtained. 12 and 13 show the vibration level of the chassis 15 detected in the playback (PB) state near the rotary head drum 17. FIG. 12 shows that the rubber hardness of the rubber elastic member 12 of the buffer means 14 is reduced. FIG. 13 shows a case where the rubber hardness of the rubber elastic member 12 is 100 degrees. Also,
In the figure, the horizontal axis shows the frequency (Hz), and the vertical axis shows the amplitude (dB). The present case is shown by a solid line, and the conventional one is shown by a dotted line. As is clear from the comparison explanatory view of the test data, it was found that the vibration characteristics of the chassis 15 can be suppressed in any case in a low frequency (125 Hz or less) region as compared with the conventional vibration characteristics. As a result, the image quality and the sound quality can be further improved as compared with the conventional one. As described above, since adverse effects on image quality and sound quality can be reduced to a minimum, more stable tape running can be realized, and jitter components appearing as image fluctuations can be reduced as much as possible.

Further, as shown in FIG. 2, since the tape stabilizers 50 and 60 are disposed on the tape entrance side A and the tape exit side B of the rotary head drum 17, respectively, one tape stabilizer is provided only on the conventional tape entrance side. Vibration of the tape 71 with respect to the rotary head drum 17 can be suppressed as compared with the case of the above. FIG. 11 shows the test results of the vibration characteristics of the tape 71. In the figure, the horizontal axis indicates frequency (kHz), and the vertical axis indicates amplitude (dB). The present case is indicated by a solid line, and the conventional one is indicated by a dotted line. As is clear from the comparison explanatory diagram of the test data, it was found that the tape vibration can be attenuated to a maximum of 10 dB in the frequency range of 1.4 kHz as compared with the conventional one. Thereby, the vibration of the tape 71 around the entire rotary head drum 17 including the tape outlet side B can be reliably prevented, and the problem such as color unevenness can be completely eliminated. It is possible to minimize the occurrence of jitters due to vibration and to reproduce sharp images.

According to the above-described embodiment, the case where the present invention is applied to an M-loading type VTR has been described.

Further, a T-shaped tape stabilizer 50 and an H-shaped tape stabilizer 60 may be directly attached to the chassis 15. Further, the T-shaped tape stabilizer 50 is attached to the tape inlet side A of the rotary head drum 17, and the tape outlet side B The H-shaped tape stabilizer 60 is provided in each of the above, but the H-shaped tape stabilizer is provided on the tape inlet side A,
Needless to say, various design changes are possible, such as providing a T-shaped tape stabilizer on the tape exit side B.

[Effects of the Invention] As described above, according to the recording / reproducing apparatus of the present invention, the tape stabilizer is provided at the position on the tape entrance side and the tape exit side of the mounting member arranged around the rotary head drum with respect to the rotary head drum. Since each was attached,
Each of the tape stabilizers can reliably prevent the tape from vibrating around the entire rotary head drum including the tape exit side. As a result, problems such as jitter and color unevenness can be completely solved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a VTR showing one embodiment of the present invention, and FIG.
The figure is a plan view of the resin frame used in the VTR,
FIG. 4 is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a plan view of the operation panel of the VTR, FIG. 5 is a rear view of the operation panel,
6 is a side view of the operation panel, FIG. 7 is a cross-sectional view of the operation panel, FIG. 8 is an explanatory view showing a tilting operation of the operation panel, and FIG. 9 is a cross-sectional view of a tape stabilizer on the tape entrance side. , Fig. 10 is a cross-sectional view of the tape stabilizer on the tape exit side, Fig. 11 is an explanatory diagram of data comparison of the frequency analysis result of the tape, and Fig. 12 is data of vibration characteristics when the rubber elastic member has a rubber hardness of 50 degrees FIG. 13 is an explanatory diagram for comparison, FIG. 13 is an explanatory diagram for comparing data of vibration characteristics when the rubber hardness of the rubber elastic member is 100 degrees, FIG. 14 is a schematic plan view of a conventional VTR, and FIG. FIG. 1 VTR (recording / reproducing device), 16 drum mounting base, 17 rotating head drum, 18 slide base,
50, 60: Tape stabilizer, A: Tape entry side, B: Tape exit side.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-36456 (JP, A) JP-A-64-21744 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G11B 15/665 G11B 15/61

Claims (1)

(57) [Claims] 1. A recording / reproducing apparatus in which a tape stabilizer is mounted at a position of a tape inlet side and a tape outlet side of a mounting member disposed around a rotary head drum with respect to the rotary head drum, respectively. Is formed to have a mass larger than the equivalent mass of the tape stabilizer on the tape exit side.