JP2961778B2 - 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] The present invention relates to a recording / reproducing apparatus having a chassis in which a rotating head drum, a reel base and the like are mounted in a main body of the apparatus.
In addition, since the lower edges of the different sides of the chassis are attached to the frame in the apparatus main body via at least three cushioning members mounted thereon, the left and right balance of the apparatus main body can be equalized. In addition, vibration, external shock, vibration transmission, and the like can be reliably suppressed, and more stable tape running can be obtained.

[Related Art] For example, in a VTR (Video Tape Recorder), a rotating drum having a head for recording and reproducing video signals is arranged at a slight inclination from the tape running direction, and an oblique pattern is formed on the tape while rotating. A helical scan type rotary head drum for recording is generally used, and a chassis (a so-called mechanical chassis) on which a reel base or the like to which the rotary head drum or tape cassette is mounted and driven is mounted.
It is arranged at a position closer to one side in the apparatus main body.

[Problem to be Solved by the Invention] However, in the above-mentioned conventional VTR, the so-called mechanical chassis, which is the heaviest part, is arranged at a position closer to one side in the apparatus main body. It has been pointed out that the chassis tends to vibrate in a low frequency region or the like when the rotary head drum is rotated due to the balance, which adversely affects image quality and sound quality.

Accordingly, the present invention provides a recording / reproducing apparatus capable of stabilizing the center of gravity of a set and further improving vibration characteristics.

[Means for Solving the Problems] In a recording / reproducing apparatus having a chassis in which a rotating head drum, a reel base and the like are mounted in an apparatus main body, the chassis is disposed at a substantially central portion in the apparatus main body, and The lower edges of the different sides are attached to the frame of the apparatus main body via at least three cushioning members mounted thereon.

[Operation] A chassis on which a rotating head drum, a reel base, and the like are mounted is disposed at a substantially central portion in the apparatus main body, and at least three cushioning members on which lower edges of different sides of the chassis are mounted. Since it was attached to the frame of the above device main body,
The balance between the left and right sides of the apparatus body is equalized, and the occurrence of torsion and resonance are suppressed. In addition, the transmission of shock and vibration from the outside is reliably suppressed by the at least three buffer members, and more stable tape running is obtained.

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 into each of the recesses 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 1c on the chassis 15, a rotary head drum 17 is rotatably supported via a drum mounting base (mounting member) 16, and the rotary head drum 17 on the chassis 15 is rotatable.
An inclined guide 19 and a vertical guide 20 for pulling out the tape 71 in the tape cassette 70 around the rotary head drum 17 and loading the tape 71 through a pair of slide bases (mounting members) 18, 18, etc. It is set up. 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 drawing. It is arranged. In FIGS. 2 and 3, 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 concave portion 2b of a front surface 2a of the apparatus main body 2. 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 is capable of moving an image from frame advance to slow reproduction and standard reproduction according to the speed, for any reason. 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 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.
Thereby, 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 the operation panel 30 is operated when the operation means 33 and the like are operated.
30 vibrations 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 through 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. Also,
Similar 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
A pair of magnets embedded on both sides of the recess 2c on the front surface 2a
By magnetically attaching to the 29, 29, the lid 80 stands up and the state where the concave portion 2c is closed 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 rotates about 90 ° about the axis 32, and the inner surface of the operation panel 30 where the jog dial 33a and the like are provided becomes horizontal as shown in FIG. At this time, a base 31 is provided between the front surface 2a of the apparatus main body 2 and the operation panel 30.
Since the two buffer means 37 and 42 are interposed therebetween, the vibration when the operation panel 30 is rotated forward and tilted about the shaft 32 can be reliably absorbed, and the operation panel 30 can be reliably absorbed. However, due to its weight or the like, it does not jump up as in the conventional case, but falls down smoothly. Further, when operating the jog dial 33a, the shuttle ring 33b, etc. of the operation panel 30, the vibration of the operation panel 30 is reduced by the two buffer means.
37 and 42 ensure absorption.

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. In addition, comparing the vibration level that greatly affects the image quality and sound quality with that of a conventional so-called VCR in which the mechanical chassis is shifted to one side, the test results shown in FIGS. 12 and 13 were obtained. Figures 12 and 13 show playback (PB)
The vibration level of the chassis 15 in the state
12 is shown in FIG. 12, and FIG.
13 shows a case where the rubber hardness of the rubber elastic member 12 is 50 degrees.
The figure shows a case where the rubber hardness of the rubber elastic member 12 is 100 degrees.
In the figure, the horizontal axis represents frequency (Hz) and the vertical axis represents amplitude (dB).
, Respectively, the present one 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 fluctuation can be reduced as much as possible.

As described above, the chassis 15 on which the rotating head drum 17, the reel base 21, and the like constituting the so-called mechanical chassis are mounted.
Is disposed at a substantially central portion in the apparatus main body 2 and the chassis 15 is attached to the mounting frame 11 of the frame 10 in the apparatus main body 2 via the three cushioning members 14. The left and right balance can be equalized, and the occurrence of torsion and resonance can be suppressed.

Further, three cushioning members as a damper mechanism are provided between the chassis 15 and the mounting frame portion 11 of the frame 10 supporting the chassis 15.
With the interposition of 14, the transmission of external shocks and vibrations can be reliably absorbed and reduced, and more stable tape running can be obtained.

Further, since the chassis 15 is installed at a substantially central portion in the apparatus main body 2, the operation panel 30 having the operation means 33 and the like and the lid 80 can be provided on both sides of the front surface 2a of the apparatus main body 2, Operability can be improved.

Furthermore, as shown in FIG.
Since the tape stabilizers 50 and 60 are arranged on the tape entrance side A and the tape exit side B of the tape 17 respectively, the vibration of the tape 71 with respect to the rotary head drum 17 is smaller than that of the conventional tape entrance side having only one tape stabilizer. Can be suppressed. FIG. 11 shows the test results of the vibration characteristics of the tape 71. In the figure, the horizontal axis is frequency (kH
z), and the vertical axis indicates the 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 illustration of this test data, the frequency 1.4k
It was found that the tape vibration can be attenuated by up to 10dB in the range of Hz. This allows
The occurrence of jitter due to unnecessary vibration caused by the tape 71 is minimized, and a sharp image can be reproduced.

According to the above-described embodiment, the case where the present invention is applied to an M-loading type VTR has been described. However, the present invention is not limited to this and can be applied to various recording / reproducing apparatuses such as a U-loading type VTR.

Further, two buffer members 14 are provided on the side of the heavy rotating head drum 17 and the chassis 15 is supported by a total of three buffer members 14. However, it is needless to say that four or more buffer members may be provided.

[Effects of the Invention] As described above, according to the recording / reproducing apparatus of the first signature,
A chassis on which a rotating head drum, a reel base, and the like are mounted is disposed at a substantially central portion in the apparatus main body, and the apparatus is arranged via at least three buffer members on which lower edges of different sides of the chassis are mounted. Since it was attached to the frame inside the main body,
The left and right balance of the device main body can be equalized, and the occurrence of torsion and resonance can be suppressed.

In addition, the plurality of cushioning members can prevent external shock,
Vibration transmission can be absorbed and suppressed reliably, and a more stable tape running can be obtained.

[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,
The figure is a sectional view along the line III-III in FIG. 2, and the figure 4 is a VTR.
5 is a rear view of the operation panel, FIG. 6 is a side view of the operation panel, FIG. 7 is a cross-sectional view of the operation panel, and FIG. 8 is a tilting operation of the operation panel. FIG. 9 is a cross-sectional view of the 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 a data comparison explanatory view of the frequency analysis result of the tape, FIG. FIG. 13 is a data comparison explanatory diagram of the vibration characteristics when the rubber hardness of the rubber elastic member is 50 degrees, and FIG. 13 is a data comparison explanatory diagram of the vibration characteristics when the rubber hardness of the rubber elastic member is 100 degrees. 1 VTR (recording / reproducing device), 2 device main unit, 10
Frame (frame body), 14 ... buffer means, 15 ... chassis,
17 ... Rotating head drum, 21 ... Reel base.

Claims (1)

(57) [Claims] 1. A recording / reproducing apparatus having a chassis in which a rotating head drum, a reel stand and the like are mounted in a main body of the apparatus, wherein the chassis is arranged at a substantially central portion in the main body of the apparatus, and different sides of the chassis are provided. A recording / reproducing apparatus, wherein the recording / reproducing apparatus is attached to a frame in the apparatus main body via at least three cushioning members on which a lower edge portion is mounted.