JPS62110654A - Mode switching device for tape recorder - Google Patents

Abstract

PURPOSE:To send out noiseless output without contact by providing a controlling circuit that receives output signals of a mode switching operating section and a mode position detecting section and outputs a motor rotation command signal and a current application command signal of LED of the mode position detecting section. CONSTITUTION:A rotary plate 26 has slits 27a, 27b, 27c, 27d, 27e, 27f and 28 and moves controlling members of a tape recorder to respective position according to specified mode corresponding to rotation of a motor 16. In a mode position detecting section 18, a phototransistor TR 30 and an LED 31 are opposite to each other with the rotary plate 26 between, and similarly, a photodiode 32 and an LED 33 are opposite to each other. Light emitted from the LED 31 passes through slits 27a-27f and irradiates the diode 32. Similarly, light emitted from a diode 33 passes through the slit 28 and irradiates the diode 32. Output of the mode switching section 14 and output signals of the mode position detecting section are inputted by a controlling circuit 23, and motor rotation command and a current application command signal of LED of the detecting section 18 are outputted.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a mode switching device for a tape recorder.

2. Description of the Related Art As a conventional mode switching device for tape recorders and video tape recorders, there is a mode switching device having a mode position detecting section using a slider as shown in FIGS. 7 and 8. In FIG. 7, reference numeral 1 indicates a mode switching operation section using operation keys, and reference numeral 2 indicates a rotation command signal that instructs the rotation/stop and rotation direction of the motor 3, which is input to the driver 4. 5 is a mode position detection section, which outputs a mode position detection signal 6.
is manually input to the control circuit 7.

Here, the operation of the mode position detection section 6 will be explained using FIG. 8, FIG. 9, and FIG. 10. A fixed flat plate 12 has conductive contacts, and a rotor 8 having sliders 8 a , 8 b , and 8 c rotates on the flat plate 12 in response to the rotation of the motor 3 . On the fixed flat plate 12, a first contact 9. is arranged from the inner circumference. Second contact 1
0. Third contacts 11a, 11b, llc, 11d, 11
e.

11f are arranged at positions corresponding to positions A, E, C, D, E, and F, respectively, and the third contact 11a111b
, 11C111d1110, 11 (are combined with a conductor to form the contact 11. Also, the positions A, B, C, D, E
, F are ETECT mode, INITIA, respectively.
Compatible with L mode, FF/REWIND mode, 5TOP mode, PLAY mode, and REVIEW mode.

FIG. 9 shows a circuit for obtaining the mode position detection signal 6 using the mode position detection section 6 shown in FIG.

The slider 8a and the contact 11 constitute a switch 13a, the slider 8b and the contact 10 constitute a switch 13b, and the slider 8
c and contact 9 constitute a switch 13c.

The switch 13C is closed regardless of the rotational position of the rotor 8, and the contact 9 has a voltage CC (logic level High).
) is set. Switch 13a and switch 1
3b opens and closes depending on the position of the rotor 8, so the mode position detection signals ea and 6b become as shown in FIG.
, F becomes High, and becomes Low at other positions. Further, the position detection signal 6b is High L when the rotor 8 is at position G between position B and position C.
ow switches, becoming High on the A side from position G and Low on the F side from position G.

When detecting each mode position using the mode position detecting section 5 configured as described above and the control circuit 7 configured with a microcomputer or the like, the operations shown in FIG. 11 are required. That is, even if the mode position detection signals ea and eb shown in FIG. 10 are input to the control circuit 7 as two-pit binary signals, the values do not correspond one-to-one to the position of the rotor 8. The position of the rotor 8 cannot be determined in an initial state such as when the power is turned on. Therefore, first move the rotor 8 to position B (
(INITIAL mode). The procedure for this operation is shown in the flowchart of FIG. In the flowchart, CCW/CW indicates that the motor 3 is rotated in the direction in which the rotor 8 rotates in the direction of the arrow CCW/CW shown in FIG. After the rotor 8 has moved to position B in this manner, the position of the rotor 8 can be detected based on the number of times the mode position detection signal 6a changes from high to low, and mode position detection is possible.

Problems to be Solved by the Invention In the mode switching device configured in this way, the sliders 8c, 8b, 8a of the rotor 8 are connected to the first contacts 9. Second contact 10. Since the third contact point 11 rotates while making contact with the third contact point 11, wear of the contact point becomes a problem, and noise such as chattering is generated due to the unevenness of the contact point.

In view of the above, an object of the present invention is to provide a mode switching device having an optical mode position detection section that is non-contact, does not generate noise, and consumes low power.

Means for Solving the Problems The present invention provides a motor for moving controlled members of a tape recorder to respective positions according to a predetermined mode;
A mode position detecting section consisting of at least one set of a light emitting element and a light receiving element that generates a signal corresponding to each mode, a mode switching operation section that switches to a predetermined mode, and an output signal and mode position of the mode switching operation section. This mode switching device for a tape recorder includes a control circuit that inputs an output signal from a detection section and outputs a rotation command signal for a motor and a light emission command signal for a light emitting element of a mode position detection section.

Operation The present invention performs position detection optically with the above-described configuration, so a mode position detection signal without contact and noise can be obtained, and stable position detection can be performed for a long time. Further, by controlling the light emission timing of the light emitting element of the mode position detection section, it is possible to reduce power consumption.

Embodiment FIG. 1 shows a block diagram of a mode switching device which is a first embodiment of the present invention. In FIG. 1, reference numeral 14 indicates a mode switching operation unit using operation keys, and reference numeral 16 indicates a rotation command signal that instructs the rotation/stop and rotation direction of the motor 16, which is input to the motor driver 17. Reference numeral 18 denotes a mode position detection section, and a device position detection signal 19 constituted by this section is inputted to the control circuit 20.

The control circuit 2Q is usually composed of a microprocessor, and includes an input key processing section 21 that processes signals input from the mode switching operation section 14, and a mode position processing section that detects the current mode position based on the mode position detection signal 19. A motor control unit 23 and a mode position detection unit 18 determine the rotational direction of the motor 16 from the results of the detection signal processing unit 22, the input key processing unit 21, and the mode position detection signal processing unit 22, and output the rotation command signal 15. A light emitting element 0N10FF control unit 26 that outputs an energization command signal 24 that controls energization of the light emitting element.
Consists of.

Here, the operation of the mode position detection section 18 will be explained using FIG. 2, FIG. 3, and FIG. 4. In FIG. 2, 26 is a rotating plate, which is a first S'J soto 27a.

27b, 27c, 27d, 27@, 27f and a second slit 28, fixed to the rotating shaft 29,
It rotates in response to the rotation of the motor 16. A phototransistor 3Q and a light emitting diode 31 face each other with the rotating plate 26 in between, and similarly a phototransistor 32 and a light emitting diode 33 face each other. The light emitted from the light emitting diode 31 is slit) 27a.

The photodiode 3o is irradiated through 27b, 2γc, 27d, 27s, and 27f. Similarly, light emitted from the light emitting diode 33 is irradiated onto the photodiode 32 through the slit 28.

FIG. 3 shows a circuit for obtaining mode position detection signals 19a and 1sb using the mode position detection section 18 shown in FIG.

When trying to obtain the position detection signals 19a and 19b, the light emitting element 0N10FF control unit 25 outputs the energization command signal 24.
a, 2ab are set to High, so that transistors Tr1. Both Tr2 are turned on, current flows through the light emitting diodes 31 and 33, and light is emitted. motor 16
As the rotation plate 26 rotates, the amount of light irradiated to the phototransistors 30 and 32 changes.
The mode position detection signals 19a and 19b are as shown in FIG. Slits 27a, 27b, 2A C227d
, 27e, and 27f are located on the optical axes of the light emitting diode 31 and the photodiode 30, respectively.

When set to F, the rotating plate 26 is at the positions A, B,
C.

Position detection signal 1 when located at D, E, or F
9& becomes I, ow, and becomes High at other positions. In addition, the position detection signal 19b switches between Low←-High at position G where the rotary plate 26 is between position B and position C, is Low on the A side of position G, and is High when below position G.
becomes.

When detecting each mode using the mode position detecting section 18 configured in this way and the control circuit 20 configured with a microcomputer, the operations shown in FIG. 5 are required.

That is, the mode position detection signal 19 as shown in FIG.
Even if a and 19b are input to the control circuit 20 as 2-bit binary signals, the values and the position of the rotating plate 26 do not correspond one-to-one, so in an initial state such as when the power is turned on, the rotating plate 26 Since the position cannot be determined, it is first necessary to move the rotary plate 26 to position B (INITIAL mode). The procedure for this operation is shown in the flowchart of FIG. In the flowchart, CCW/CW means that the rotary plate 2 is moved in the direction of the arrow CCW/CW shown in FIG.
6 rotates the motor 16.

After the rotary plate 26 has moved to position B in this manner, the position of the rotary plate 26 can be detected based on the number of times the mode position detection signal 19a changes from high to low, and mode position detection is possible.

For example, the rotary plate 2
FIG. 6 shows the timing of each signal when the motor 6 is rotated from position B to position B. When the key human power output from the mode switching operation unit 14 is received, the control circuit 2o sends an energization command signal 24a to the light emitting diode 31 and a rotation command signal 1 to the motor 16 so that the rotary plate 26 rotates in the CW force direction.
5 is output. When the motor 16 rotates and the rotating plate 26 rotates in the CW force direction, the mode position detection signal 1 is generated.
9a starts from Low at position B and becomes H between positions B and C.
High, Low at position C, High between positions C and D
, and then the position where it becomes Low is the position, so the control circuit 20 detects that the mode position detection signal 19a becomes Low, stops the motor 16, and turns off the power to the light emitting diode 310. Transition from any position to another position can be performed in a similar manner.

According to these embodiments, since position detection can be performed optically and without contact, stable detection can be performed without generating noise. In addition, it is only necessary to flow current to the light emitting diode during mode transition, and power consumption can be reduced.

In the first embodiment, the mode position detection section was configured to detect the mode position using a rotary plate 26 that rotates in accordance with the rotation of the mode switching motor, as shown in FIG. Alternatively, a slide plate may be used to detect the mode position.

FIG. 12 shows a mode position detecting section of a mode switching device according to a second embodiment of the present invention using a slide plate. In Fig. 12, 34 is a slide plate, the third buzzard ssa,
ssb, 35G, 3sd.

3se, 35f and a fourth slit 36,
Arrow A corresponds to the rotation of the mode switching motor.

Move back and forth in the direction of K. A phototransistor 37 and a light emitting diode 38 face each other with a slide plate 34 in between, and similarly a phototransistor 39 and a light emitting diode 4o
are facing each other. Light emitted from the light emitting diode 38 is irradiated onto the phototransistor 37 through the slit 36. Furthermore, the light emitted from the light emitting diode 40 passes through the slits 35a, 35b, 35c, 35d, 35e, 35.
The phototransistor 39 is irradiated through f.

It is clear that the mode position detection section having such a configuration can obtain a mode position detection signal similar to that of the mode position detection section of the first embodiment of the present invention shown in FIG.

Furthermore, in the first embodiment, a phototransistor and a light emitting diode are arranged to sandwich a rotary plate having slits, but the mode position can be determined by using a rotary plate having a surface consisting of a reflective part and a non-reflective part and a reflective photosensor. Detection may also be performed.

FIG. 13 shows a mode position detecting section of a mode switching device according to a third embodiment of the present invention using a reflective photosensor. In FIG. 13, reference numeral 41 denotes a rotating plate, which is fixed to a rotating shaft 42 that rotates in accordance with the rotation of the mode switching motor. On the non-reflection surface 44 of the rotary plate 41, a first reflection member 4sa,
4sb, 4sc.

43d, 43e, 43f and a second reflective member 4 are arranged. In addition, a first reflective photosensor 45 and a second reflective photosensor 46 are provided at positions facing the non-reflective surface 44.
are arranged. The light emitted from the light emitting diode built into the first reflective photosensor 45 is transmitted to the first reflective member 43a.

The light is reflected by ssb, 43c, 43d, 43e, and 43f and is irradiated onto a phototransistor built in the first reflective photosensor 45. Similarly, light emitted from the light emitting diode built in the reflective photosensor 46 of the tube 2 is reflected by the second reflective member 47 and irradiated onto the phototransistor built in the second reflective photosensor 46. .

It is clear that the mode position detection section having such a configuration can obtain a mode position detection signal similar to that of the mode position detection section of the first embodiment of the present invention shown in FIG. Use of this embodiment has the advantage that the mode position detecting section can be made thinner.

Furthermore, in the present invention, a switch is used in place of the second reflective member 47 on the rotary plate 41 and the second reflective photosensor 4e in the mode position detection device shown in FIG. 13 to obtain a similar position detection signal. FIG. 14 shows the mode position detection section of the mode switching device according to the fourth embodiment. In Figure 14,
A rotating plate 48 is fixed to a rotating shaft 49 that rotates in accordance with the rotation of the mode switching motor. On the non-reflection surface 60 of the rotary plate 48 are third reflective members 51 a and 51 b.
.

51c, 61d, 51e, and 51f are arranged, and a third reflective photosensor 52 is arranged at a position facing the non-reflection surface 60. Further, a gear 63 is attached to the rotating shaft 49, and a switch 54 is connected to ○N10F via a transmission member 55.
F is given.

FIG. 16 shows a circuit for obtaining mode position detection signals tsea and tseb using the mode position detection device shown in FIG. 14. When trying to obtain the position detection signals 56a and 56b, the energization command signal 6 is set to High by the light emitting element 0N10FF control unit 26, as in the first embodiment.
Therefore, the transistor Tr3 is turned on, and current flows through the light emitting diode 52a built in the reflective photosensor 52, which emits light. Third reflecting members 51a, 51b, 51C, 51d emit light from the light emitting diode 52a.

The light reflected by 51e and slf is irradiated onto the phototransistor s2b. Furthermore, the switch 64 opens and closes as the mode switching motor rotates. Therefore, the mode position detection signals s6a and tseb obtained by the mode position detection section shown in FIG. 14 and FIG. 16 become as shown in FIG. 16, and the same signals as explained in the first embodiment are obtained. It will be done. This device has the advantage that the size of the rotating plate can be reduced, and the number of transistors and optical sensors can be reduced or eliminated, resulting in cost reduction.

It goes without saying that this device can also be used in Abunlute-type calibration devices in addition to those described above.As explained in detail, the present invention is non-contact and eliminates contact wear. Furthermore, the present invention provides a mode switching device that can perform stable mode position detection for a long period of time without worrying about the generation of noise, and further achieves low power consumption.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention;
The figure is a perspective view of the main parts showing the configuration of the mode position detection unit shown in Figure 1, Figure 3 is its circuit diagram, Figure 4 is an operation waveform diagram, and Figure 5 is a flowchart for explaining the position detection operation. ,
Figure 6 is an operating waveform diagram, Figure 7 is a block diagram of a conventional mode switching device, Figure 8 is a top view of the main parts, Figure 9 is its circuit diagram, Figure 10 is an operating waveform diagram, and Figure 11. 8 is a flowchart for explaining the position detection operation using the mode position detection unit shown in FIG. 8, FIG. 12 is a perspective view showing the configuration of the second part of the present invention, and FIG. 15 is a circuit diagram of the mode position detecting section shown in FIG. 14, and FIG. 16 is an explanatory diagram of its operation. 6...Mode position detection section, ea, sb...
・Mode position detection signal, 8...Rotor, 8a,
8b, 8c...Slider, 9...First contact, 10...Second contact, 11a, 11b,
11c, 11d, 11e. 11f...Third contact, 15...Rotation command signal, 18...Mode position detection unit, 1sa, 19
b...Mode position detection signal, 24...
Energization command signal, 27a, 2γb, 2γc, 27d, 27
e, 27f...first slit, 28...
・Second slit, 30.32...Phototransistor, 31.33...Light emitting diode, 3
5a, 35b, 35c. 35, :1-71'es f...Third slit, 36...Fourth slit, 37.39.
...Phototransistor, 38.40...
- Light emitting diode, 43a. 43b, 43C, 43d, 43e, 43f--
-...-first reflective member, 44... non-reflective surface,
46...First reflective photosensor, 46...
...Second reflective type 7 sensor, 47...Second
reflective member, 51a. 61b, 51C, 61d, 519.51 f=-...-
Third reflective member, 62... Reflective photosensor, 64... Switch, 56a, ssb...
...mode position detection signal, 67... energization command signal. Name of agent: Patent attorney Toshio Nakao and 1 other person
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Claims (2)

[Claims] (1) Mode position detection consisting of a motor for moving the controlled member of the tape recorder to each position according to a predetermined mode, and at least one set of a light emitting element and a light receiving element that generate a signal corresponding to the mode. a mode switching operation section for switching to a predetermined mode; an output signal of the mode switching operation section and an output signal of the mode position detection section are input, and a rotation command signal of the motor and a mode switching operation section of the mode position detection section are input. A tape recorder mode switching device consisting of a control circuit that outputs an energization command signal for a light emitting element. (2) A mode switching device for a tape recorder according to claim 1, wherein the energization command signal for the light emitting element output from the control circuit is controlled in accordance with the rotation command signal of the motor. .