JPS59142789A - Display device for amount of tape run - Google Patents

Abstract

PURPOSE:To make the start and end of run display coincident regardless of whether a tape runs forward or backward and to prevent a misread by moving a lighting part to a symmetrical position by a logical circuit part about the center of plural light emitting elements as an axis when the tape run is reversed. CONSTITUTION:When the tape run starts, rotation detection parts 10 and 11 for reel turntables output pulses corresponding to the rotation of the reel turntables. The display position corresponding to a run position is detected firstly. Namely, detected values (m) 1-9 in a figure are found. When the detection is completed, the run direction is judged from the state of a detection switch 12. A variable H is set to 1 when the run direction is forward or to 0 when backward. Then, one LED is specified by the contents of the detected value (m) and variable H to light on. When the run direction is reversed during said operation, the variable H which is 1 is converted into 0 and the variable H which is 0 is converted into 1. When the conversion is completed, said operation is performed again.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tape running amount display device in a magnetic recording/reproducing device capable of reversing tape running.

(Configuration of conventional example and its problems) Conventionally, to display the amount of tape travel in a magnetic recording/playback device capable of reversing tape travel, for example, when the tape is running in the forward direction, light emitting elements for display are lit sequentially from the left side, and when the tape is running in the reverse direction, the light emitting elements for display are lit sequentially from the left side. There is a configuration in which the tape is lit in the same way from the right side, but this configuration has the disadvantage that the beginning and end of the tape running display are reversed depending on whether the tape is running in the forward direction or in the reverse direction, which often causes the user to misread the tape. was there.

(Objective of the Invention) The present invention solves the above-mentioned conventional drawbacks, and has a simple structure that makes the beginning and end of the tape running display the same regardless of whether the tape is running forward or reverse, and also makes it possible to display the tape at the end. It is an object of the present invention to provide an easy-to-use tape running amount display device that can instantly follow even if a running reversal operation occurs midway.

(Structure of the Invention) The present invention provides a tape running amount display device in a magnetic recording and reproducing device capable of reversing tape running, which includes two rotation detection units for detecting the rotation of each reel stand of a tape running drive unit, and a plurality of light emitting elements. A tape travel amount display section formed by arranging the above-mentioned tape running amount display section, and a pulse having a width proportional to the rotation speed of each reel table from the rotation detection section are logically processed, and at least one of the light emitting elements is arranged.
and a tape running direction detection unit that detects the running direction of the tape, and when the tape running of the tape running drive unit is reversed, the logic circuit unit causes the plurality of The above object is achieved by configuring the lighting section to instantaneously move to a symmetrical position with the center of the light emitting element as an axis.

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

FIG. 1 is a front view showing an example of a magnetic recording/reproducing apparatus equipped with a tape running amount display device according to the present invention. In the figure, l is the magnetic recording/reproducing apparatus main body;
A plurality of light emitting diodes (hereinafter referred to as LEDs) 3a to 31
A tape running amount display section 3, a stop operation switch 4,
, fast forward operation switch 5, rewind operation switch 6, Qi 70 travel reversal operation switch 7, volume adjustment button IJ,
- Equipped with a knob 8.

FIG. 2 shows a block circuit diagram of a tape running amount display device showing an embodiment of the present invention. First and second rotation detection units 1.0 that detect rotation of each reel stand of a drive unit (not shown)
．． 11 and a tape running direction detection switch 12 which is provided in the tape running drive section and mechanically detects whether the tape is running in the forward direction or in the reverse direction. On the other hand, the output of the microcomputer 9 is d LED3a~
31 are connected with the cathode side in common, and a resistor 13 is connected between the cathode and ground. Further, the configuration is such that power is applied to the microcomputer 9 as necessary.

Next, the processing operation of the microcomputer 9 in FIG. 2 will be explained based on the flowchart shown in FIG. When a cassette tape is inserted into the cassette tape insertion slot 2, the tape drive section automatically starts playing the tape according to a program of another microcomputer (not shown). When the tape starts running, the reel stands begin to rotate, and pulses are output from the rotation detection sections 10, 11 of each reel stand in accordance with the rotation of the reel stands. From this state, the chive travel amount is detected according to the flowchart shown in FIG. In the Florchart diagram of FIG. 3, first, the display part i is detected for the running position of the tape at ■ to ■ (the detected values m of 1 to 9 shown in FIG. 4 are obtained), and in the case of the present invention, The rotation detection section lo.

The display device is detected by logically determining the ratio of the pulse widths outputted from 11. This detection typically takes several seconds.

When the detection of the display position is completed, it is determined whether the tape is running in the forward direction or in the reverse direction based on the state of the tape running direction detection switch 12. If the tape runs in the positive direction, the program
The program advances from ■ to ■ and sets the variable H to 1, and if the tape is running in the opposite direction, the program advances from ■ to ■ to ■ and sets the variable H to 0. After that, the content shown in FIG.
Specify one LED and turn it on (■ to ■). In Figure 4, for example) if l = 1 and m = 3, the LED
3 c will be lit. If there is no reversal operation, the above operation proceeds in steps 1 to 2 to 3, and the same process as above is repeated again. On the other hand, if the tape running direction is reversed due to the end of the tape or the operation of the tape running reversal operation switch 7 during the above operation, the program progresses from ■ to ■ and if the variable H is 1, it becomes 0 (■ to 0 ~ ■) Convert and variable H
If is O, convert it to 1 (■~0~■). When the conversion of the variable H is completed, a new chive travel amount display can be performed immediately after the tape travel reversal operation to turn on the p LED i, again in the same way as above, depending on the detected value m of the display position and the contents of the variable H. It is possible.

Further, FIG. 5 shows the display of the LEDs 3a to 31 when the tape running is reversed. In the present invention, for example, if 30 LEDs are initially lit as shown in Figure (a), then when the tape is reversed, 3 LEDs in the center as shown in Figure 9(b) are turned on.
The LEDs 3g located symmetrically with respect to the axis e are lit because the display is performed according to the contents of FIG. 4.

Further, in the present invention, only one point is lit, but the same effect can be achieved even if, for example, all the points from the beginning of the tape to the tape running position are lit.

(Effects of the Invention) In the present invention, in which the amount of tape travel is displayed using a plurality of LEDs, the tape travel distance can be displayed at the beginning of the tape winding or when the tape winding drive unit is operating in either the forward direction or the reverse direction. Since the relative position of the tape running relative to the final position is displayed correctly, the user can confirm the amount of tape running at a glance. In addition, when the tape is running in one direction and the direction is reversed, the tape running position is detected again at the reversed position, which prevents a blank state from occurring. This greatly improves usability for users.

[Brief explanation of drawings]

FIG. 1 is a front view showing an example of a magnetic recording/reproducing apparatus equipped with a tape running amount display device according to the present invention, FIG. 2 is a block diagram of a tape running amount display device showing an embodiment of the present invention, and FIG. 3 4 is a flow chart showing the processing operation of the logic circuit section in the take 0 travel amount display device of the present invention, FIG. It is a figure which shows the example of a display in the tape running amount display apparatus of this invention. ■...Magnetic recording and reproducing device main body, 2...Cassette Q7
0 insertion slot, 3... tape travel amount display section, 3a to 31.
... LED (light emitting diode), 4... Operation switch for stopping, 5... Operation switch for fast forwarding, 6... Operation switch for rewinding, 7... Operation switch for reversing tape running, 8... Volume adjustment volume knob, 9.Logic circuit section (microcomputer), 10.11.Rotation detection section, 12.
... Tape running direction detection switch, 13... Resistor. Figure 1 2U! J Figure 3

Claims (1)

[Scope of Claims] A tape travel amount display device in a magnetic recording and reproducing device capable of reversing tape travel, comprising two rotation detection units for detecting full rotation of each tape travel drive unit, and a plurality of light emitting elements arranged. a tape travel amount display section formed by a tape running amount display section; and a logic circuit that logically processes a width of 7 yars proportional to the rotational speed of each reel stand from the rotation detection section and lights up at least one of the light emitting elements. and the tape that detects the running direction of the tape. a running direction detection section, and when the tape running of the tape running drive section is reversed, the logic circuit section
A tape running amount display device for a magnetic recording/reproducing machine, characterized in that a lighting section is instantaneously moved to a symmetrical position with respect to the middle flame of the plurality of light emitting elements.