JPH0574890B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a video tape recorder (VTR) equipped with an operation control means for detecting the rotational operation state of a rotary dial plate by a rotation detection means and controlling the operation according to the rotational operation state. Regarding dial operation devices, the present invention is applied to, for example, an operation dial for variable speed playback operation that arbitrarily changes the playback speed of images. [Prior Art] In general, VTRs are becoming more multifunctional by adding functions such as variable speed playback and green screen reservation operations in addition to the normal recording and playback mode. Variable speed playback operations that arbitrarily vary the playback speed, variable speed playback operations that switch the playback speed to still image playback, 1/2 speed playback, double speed playback, etc. are known.
In addition, conventional VTRs have been designed to have multiple functions.
It is configured to operate a large number of operating members for each function, such as an up/down switch, a 10-key switch, or a rotary dial, according to a predetermined procedure. Therefore, complicated operations are required to subtly manipulate the desired scene or find editing points on the green-illustrated videotape. [Problems to be solved by the invention] Conventional VTRs with multi-functionality as described above
However, in general, there is a problem that the various operating members provided for each function have poor operability, and in particular, the operability of the operating members for variable speed playback and variable speed playback used for editing work etc. is poor. I was getting used to it. Therefore, in view of the above-mentioned problems, the present invention has been made to
The purpose of this system is to make it possible to perform operations such as subtly manipulating the target scene or finding editing points on video tapes that have already been edited with simple operations, and the playback speed of the image can be arbitrarily varied. The present invention provides a dial operating device for a video tape recorder suitable as a dial operating device for variable speed playback. [Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention detects the rotational operation state of the rotary dial board using a rotation detection means and controls the operation according to the rotational operation state. In the dial operating device for a video tape recorder, the dial operating device for a video tape recorder is provided with a motion control means, wherein a polygonal cam surface corresponding to a unit rotation angle of the rotary dial plate detected by the rotation detecting means is formed on the rotary dial plate; The present invention is characterized in that the cam roller is configured to be elastically pressed against the cam surface. [Function] In the dial operation device for a video tape recorder according to the present invention, when the rotary dial plate is rotated, the shape of the cam surface is changed by the cam roller elastically pressed against the cam surface of the rotary dial plate. A click feeling is given by the torque change according to the torque. [Embodiment] Hereinafter, an embodiment of a video tape recorder to which the present invention is applied will be described in detail with reference to the drawings. The embodiment shown in FIGS. 1 to 12 is an application of the present invention to a stationary multifunctional VTR, and as shown in the block diagram of FIG. A motor servo circuit 3 that drives the capstan motor 2, etc., a signal processing circuit 4 for video signals and audio signals, and a display drive circuit 5.
Alternatively, the system control microcomputer 7 that controls the operation of the tuner circuit 6, etc.
Operation command signals from various operation switches 10 disposed on the front panel 110 and rotation detection output signals detected by the dial encoder microcomputer 8 of the rotation operation state of the rotary dial operation device 200 are now supplied. There is. In this embodiment, the front panel 110 of the device main body 100 includes the following:
A power switch 10A, a rewind operation switch 10B for setting various modes, a playback operation switch 10C,
Fast forward operation switch 10D, stop operation switch 1
Various operation switches 10 such as 0E and a temporary stop operation switch 10F are provided. Further, the front panel 110 is formed with an insertion slot 111 for installing a tape cassette, and is also provided with a display section 112 for displaying a timer.Furthermore, the sub-panel 120 on the right side of the front is provided with the rotary dial operating device 200. It is provided. Further, the sub-panel 120 is formed to be openable and closable with its lower end as an axis and its upper end tilt forward, and is provided with a press operation button 113 provided on the front panel 110.
It is opened by pressing the button. In the portion of the front panel 110 that is closed by the sub-panel 120, various operation switches 10a, 10b, . . . for the timer set mode and timer reservation mode are provided.
Further, the front panel 110 includes an opening/closing lid 11.
An input changeover operation switch 10s is provided in the portion closed by 4. The rotary dial operating device 200 in this embodiment has an exploded perspective view shown in FIG. 4, and a cross-sectional view of the assembled state shown in FIG. Rotating shaft 2 rotatably supported by section 202
11 is integrally formed at the center, a dial plate 221 to which an outer dial operation ring 220 is locked and is rotatable about the rotation shaft 203, and a heart-shaped dial plate 221 formed on the dial plate 221. Camshaft 2 inserted into cam hole 222
and a slide plate 230 on which 31 is erected. Three through holes 204, 205, and 206 are formed in the base substrate 201, in which three optical sensors 21, 22, and 23 for optically detecting the rotational operation state of the rotary dial operating device 200 are disposed. has been done. Further, as shown in FIG. 6, the slide plate 230 is slidably locked in the radial direction passing through the bearing portion 202 by a locking protrusion 203 provided on the base substrate 201, and An elastic force is provided by a torsion coil spring 232.
The cam shaft 231 provided on the slide plate 230 is in contact with the inner surface of the heart-shaped cam hole 222, as shown in FIG. It is provided on the inner surface of the heart-shaped cam hole 222. Now, if we consider that the outer dial operating ring 220 is rotated by +θ ₁ ° and the camshaft 231 is relatively in the position shown by the broken line in FIG. 7, the camshaft 231 and the heart-shaped cam hole 222
At the point of contact with the inner surface of the outer dial operating ring 220, the component force F' of the rotational torque F of the outer dial operating ring 220 and the torsion coil spring 232 cause the slide plate 230 to
The component force F of the elastic force Fo given to is balanced. The above outer dial operation ring 22
When no rotational torque is applied to 0, the cam shaft 231 is always returned to the tip position of the heart-shaped cam hole 222 by the elastic force of the torsion coil spring 232, and the outer dial operating ring 2
The dial plate 221 provided at 20 is configured to automatically return to a predetermined rotation angle position. The dial plate 221 includes the camshaft 23.
1 is returned to the tip position of the heart-shaped cam hole 222, the base substrate 201
First and second through holes 224 and 225 are formed at positions corresponding to the first and second through holes 204 and 205, respectively. Furthermore, the inner rotary dial plate 210 includes:
As shown in FIG. 1, a polygonal, for example, dodecagonal cam surface 212 is formed on the inner peripheral wall of the cam surface 212 so that a cam roller 233 attached to the cam shaft 231 comes into contact with the cam surface 212. It's getting old. The inner rotary dial plate 210 is
Since the cam roller 233 is in contact with the cam surface 212, when the cam surface 212 is rotated, the elastic force applied to the cam shaft 231 by the torsion coil spring 232 adjusts the shape of the cam surface 212. A click feeling is given by the torque change. In this embodiment, a reflective plate 213 with a striped pattern as shown in FIG.
10 in a ring shape, and as shown in FIG. 9, a striped reflective plate 226 alternately painted in black and white is attached in a ring shape to the dial plate 221. The three optical sensors 21, 22, 23 that detect the light reflected by the respective reflecting plates 213, 226 provided on each of the dial plates 210, 221 each use a photo interrupter consisting of a light emitting diode and a photo transistor. . and,
The first and second optical sensors 21 and 22 supply detection outputs having a phase difference of 90 degrees to the dial encoder microcomputer 8, and the third optical sensor 23 supplies detection outputs having a phase difference of 90° to the dial encoder microcomputer 8. The through holes 204, 205, and 206 of the base substrate 201 are arranged so as to supply a detection output indicating that the dial encoder 221 has been rotated to the dial encoder microcomputer 8. In the embodiment, the system control microcomputer 7 and the dial encoder microcomputer 8
As shown in the flowchart of Figure 10,
When the VTR is in the playback pause mode, the dial encoder microcomputer 8 detects the rotation direction and speed of the rotary dial plate 210 and the rotation angle position of the dial plate 221 by the outer dial operation ring 220. Based on the detected output, the system control microcomputer 7 controls the operation of the motor servo circuit 3, signal processing circuit 4, display drive circuit 5, etc., and brings the rotary dial operating device 200 into a rotational operating state. It is designed to control the operation of JOG mode or SHUTTLE mode depending on the situation. That is, in this embodiment, the dial encoder microcomputer 8 operates based on the detection output from the third optical sensor 23 that detects the reflected light of the reflection plate 226 provided on the dial plate 221 in the playback pause mode state. to determine JOG mode and SHUTTLE mode, for example,
When the outer dial operating ring 220 of the rotary dial operating device 200 is rotated, the pattern of the reflecting plate 226 of the outer dial operating ring 220 is read by the optical sensors 21, 22, and 23. Based on each detection output as shown in FIG. is supplied to the computer 7. Then, the system control microcomputer 7 switches the playback speed to the rotational angular position of the outer dial operation ring 220 based on the respective speed data A and B supplied from the system control microcomputer 7. Variable speed regeneration operation control, i.e.
Controls the operation of SHUTTLE mode.

[Table] Furthermore, in the reproduction pause mode state, when the outer dial operation ring 220 is not rotated, the dial encoder microcomputer 8 determines that it is the JOS mode, and each Through hole 22
3,224 through the inner rotary dial plate 21
Speed data A, B indicating the rotational direction and rotational speed of the inner rotary dial plate 210 based on each detection output obtained by detecting the light reflected by the reflection plate 213 of 0 by the optical sensors 21 and 22.
and direction data D are supplied to the system control microcomputer 7. That is, when the inner rotary dial plate 210 is rotated, the dial encoder microcomputer 8 detects the detection output by the second optical sensor 23 at the rising change point of the detection output waveform by the first optical sensor 21. The waveform level is
As shown in FIG. 12A, if it is "H", it is determined that the inner rotary dial plate 210 has been rotated in the normal direction,
Further, as shown in FIG. 12B, if it is "L", it is determined that the inner rotary dial plate 210 has been rotated in the reverse direction. Furthermore, the dial encoder microcomputer 8 calculates the interval between rising and changing points of the detected output waveform as shown in FIG. 12C by the first optical sensor 21 when the inner rotary dial plate 210 is rotated. By using the inner rotary dial plate 2 to measure time,
10 is calculated, and the speed data A and B shown in Table 2, for example, are supplied to the system control microcomputer 7. The system control microcomputer 7 adjusts the playback speed according to the rotational direction and rotational speed of the inner rotary dial plate 210 based on each speed data A and B supplied from the system control microcomputer 8. Switchable variable speed playback operation control i.e.
Controls JOG mode operation.

〔Effect of the invention〕

As is clear from the description of the above embodiments, according to the present invention, when the rotary dial plate is rotated,
The cam roller that is elastically pressed against the cam surface of the rotary dial plate provides a click feeling by changing the torque according to the shape of the cam surface.
When performing operations such as subtly manipulating the target scene or pushing out editing points on a videotape that has already been painted in green, it is extremely easy to align the target editing point to the frame by rotating the rotary dial board mentioned above. And it can be done reliably,
It is possible to provide a dial operating device for a video tape recorder suitable as a dial operating device for variable speed playback that arbitrarily changes the playback speed of images,
The intended purpose can be fully achieved.

[Brief explanation of drawings]

1 to 12 show an embodiment of a video tape recorder to which the present invention is applied.
The figure is a schematic plan view showing the main part configuration of the dial operating device according to the present invention applied to this embodiment, and FIG. 2 is a block diagram showing the electrical configuration of the video tape recorder of this embodiment. 3 is an external perspective view of the video tape recorder of the above embodiment, FIG. 4 is an exploded perspective view showing the configuration of the rotary dial operating device in the above embodiment, and FIG. 5 is an exploded perspective view of the rotary dial operating device of the above embodiment. FIG. 6 is a sectional view of the main part of the operating device, FIG. 6 is a schematic plan view of the base board with the slide plate attached, which constitutes the rotary dial operating device, and FIG. 7 is the same. FIG. 8 is a schematic plan view of a dial plate attached to an outer dial operating ring constituting the rotary dial operating device, and FIG. 8 shows a code pattern of a reflector provided on the inner rotary dial plate. FIG. 9 is a schematic plan view showing a code pattern of a reflector provided on a dial plate attached to the outer dial operation ring, and FIG. This is a flowchart showing the operation of the system control microcomputer and the dial encoder microcomputer, and FIG. 11 is a flow chart showing the operation of the system control microcomputer and the dial encoder microcomputer, and FIG. is a waveform diagram showing
FIGS. 12A, 12B, and 12C are waveform diagrams showing detection outputs obtained by each optical sensor by rotating the inner rotary dial plate in the above embodiment. 1, 2... Reel motor, 3... Motor servo circuit, 7, 8... Microcomputer, 10...
... Various operation switches, 21, 22, 23 ... Optical sensor, 100 ... VTR main body, 200 ... Rotary dial operation device, 201 ... Base board, 2
DESCRIPTION OF SYMBOLS 10...Inner rotating dial plate, 211...Rotating shaft, 212...Cam surface, 213...Reflector plate, 23
0...Slide plate, 231...Camshaft, 232...
...Torsion coil spring, 233...Cam roller.

Claims (1)

[Claims] 1. In a dial operation device for a video tape recorder equipped with an operation control means for detecting the rotational operation state of a rotary dial plate by the rotation detection means and controlling the operation according to the rotational operation state, the rotation detection means detects the rotation operation state of the rotary dial plate. A video tape recorder characterized in that a polygonal cam surface corresponding to a unit rotation angle of the rotary dial plate is formed on the rotary dial plate, and a cam roller is configured to be elastically pressed against the cam surface. Dial operating device.