JPS5891567A - Magnetic picture recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a failure of picture recording, by providing a signal displaying that picture is being in recording to a VTR unit, and also providing a means for making channel switching impossible, on a tuner unit. CONSTITUTION:A multi-throw push switch PS consists of channel changeover switches S9-S14-, has an interlocking plate 14, and when one operating button of a channel changeover switch Sn is pushed, it is moved in the horizontal direction temporarily, other channel switch pushed previously is released, and the channel changeover switch Sn pushed newly is locked. One end of the interlocking plate 14 has a hole, a locking key 15 is controlled by an electromagnet 16, and is locked or released. The electromagnet 16 grounds the neutral point, one end is connected to an electric power supply through a normally opening contact 12, then 12 is closed to release locking of the key 15. The other end of the electromagnet 16 is connected with the electric power supply through a contact 17 interlocked with a picture recording operating button, and when picture recording is being executed, the key 15 is locked. In this way, when picture is being in recording shifting of the interlocking plate 14 is inhibited, and channel switching is made impossible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a magnetic recording/reproducing apparatus, particularly for preventing failure of recording due to malfunction of a channel of a tuner unit during recording in a VTR unit.

Conventional magnetic recording and playback devices record a composite video signal from a tuner unit with one VTR unit.
Even when the VTR unit is in a recording operation state, the channels of the tuner unit can be switched freely. For this reason, there is a risk that the channel may be switched due to an erroneous operation during recording, resulting in failure in recording.

The present invention has been made to overcome the drawbacks of the conventional apparatus, and is characterized in that the tuner unit is configured to be unable to switch channels during recording operation of the VTR unit.

The embodiment shown in the drawings below? The present invention will be explained with reference to the following. FIG. 1 is an overall schematic diagram of the magnetic recording and reproducing apparatus of the present invention, in which 1 is a tuner unit, 2 is a VTR unit, 3 is a monitor TV, and 4.5 is a cable.

11 is a channel selector, 12 is an unlock switch, 13 is a power switch, and ANT is an antenna of the tuner unit 1. A channel selector 11 selects and receives a suitable broadcasting station from the broadcasting waves that have entered the antenna ANT, and provides a composite video signal to the VTR unit 2 via a cable 4. The composite video signal given to the VTR unit 2 is simultaneously recorded by the VTR unit 2 and sent to the monitor TV 3 via five cables.
monitored by.

And an example of the circuit configuration of channel selector 11?
This will be explained with reference to FIG. DI"DI6 is a diode,
DI7 to D24 are display light emitting diodes, D25 is a Zener diode, 81 to S8 are band changeover switches, 8
9-816 are channel selection switches, R1 to R8 are resistors, VR1-vR8 are potentiometers, 111
112 is a tuner varicap power terminal; 113 is a tuner varicap output voltage terminal; and 114 is a band switching voltage terminal. Channel changeover switches 89 to 816 are multiple bushing switches PS
It is made up of. In FIG. 2, the channel selection switch S9 is in the operating state, and the voltage applied to the tuner power supply terminal 112 is made constant by the resistor R9 and the Zener diode D25, and the voltage is changed to the potentiometer via the channel selection switch 89. added to volume vR1. A divided voltage of the potentiometer VR1 is generated at the tuner varicap output voltage terminal 113 via the diode D9k. Depending on the setting of the band changeover switch S1, a voltage appears at one of the band changeover voltage terminals 114, and the band of the tuner unit 1 is changed over. The voltage applied to the display power supply terminal 111 is the voltage applied to the display light emitting diode DI? , a resistor R1, and a channel changeover switch S9 are connected in series to ground, and the display light emitting diode D17 emits light to indicate that the broadcasting station corresponding to the channel changeover switch S9 is being received.

Next, what about the multiple bushing switches PS of the channel changeover switches 89 to 816 and the locking means that prevents channel changeover? It is shown in Figure 3. There is an interlocking plate 14 in the multi-channel switch PS, and the channel switching switch 7chi S9~
When any of the operation buttons 816 is pressed, it temporarily moves sideways, cancels the previously pressed channel changeover switch, and presses a new button. This interlocking plate 14
A hole is drilled in one end of the hole. Reference numeral 15 denotes a locking key, and an electromagnet 1 for inserting and removing the locking key 15 into the hole of the interlocking plate 14.
6 are arranged. The middle point of the coil of this electromagnet 16 is grounded, and the end of the coil that is energized in the direction of ejecting the locking key 15 from the hole is connected to a power source through the normally open contact of the lock release switch 12, and the locking key 15 is connected to the power source through the normally open contact of the lock release switch 12. The other end of the coil, which is excited in the direction of insertion, is the normally closed contact of the lock release switch 12 and the normally open contact of the lock switch 817. Connect in series to power supply. The locking switch 817 is linked to a recording operation button (not shown) of the VTR unit 2, and is configured to close when the recording operation button is set to the recording operation state.

A detailed explanation thread of the present invention consisting of the above structure,
Tuner unit l power supply 1 switch 131 ON
And press any channel changeover switch to select any broadcast? Set to reception state. Next, the VTR unit 2pr is placed in a recording operation state. By setting the recording operation state, the locking switch 817 is closed, and the electromagnet 16 is inserted into the hole of the locking key 15 in the interlocking plate 14 to prevent the interlocking plate 15 from moving laterally, and the subsequent channel changeover switch is suppression? Not allowed.

As a result, it becomes impossible to change the channel of the tuner unit (l) while the VTR unit 2 is recording, and there is a possibility that the channel may be changed due to an erroneous operation during recording. It can be prevented.

Lock release switch 12 to change channel 2?
The electromagnet 16 may be energized in the direction in which the locking key 15 is moved out of the hole.

Is this invention a tuner unit using a microcomputer using a dedicated IC as shown in Figure 4? Another applied example will be shown. Fourth
In the figure, vcct is the IC power supply terminal, and vcc2 is the tuner varicap power supply terminal.

Vout is the tuner varicap output voltage terminal.

SE is the sensor electrode, 81B is the lock switch and I
This is a normally closed contact inserted between the C power supply terminal vcc1 and the IC. There is a lock switch 81 on the IC maikoi.
A program is built in that allows the sensor electrode SE to switch channels arbitrarily when the lock switch 818 is closed, and prohibits the channel switching function by the sensor electrode SE when the lock switch 818 is open. This locking switch 818i may be opened and closed in conjunction with the recording operation of the VTR unit 2.

As can be easily understood from the above explanation.

The signal indicating that the VTR unit 2 is in the recording operation state may be not only an electrical signal but also a mechanical signal.
The means for disabling channel switching of the tuner unit 1 may be either mechanical or electrical.

As is clear from the above explanation, according to the present invention, V
If the TR unit is in the recording operation state, the tuner unit cannot switch channels, so there is no risk of recording failure due to channel switching due to erroneous operation of the tuner unit during recording.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of the magnetic recording and reproducing apparatus of the present invention, and FIG.
Is the diagram an example of a channel selector circuit configuration? FIG. 3 is a diagram showing a multiple bush switch and a σ lock means for disabling channel switching, and FIG. 4 is a diagram showing another embodiment of the present invention. l...Tuner unit, 2...VTR unit. 11...Channel selector, 12...Lock release switch, 89-816...Channel changeover switch, PS...-Multiple push switch, 14...Interlocking plate, 15...Lock key, 16 ...Electromagnet, S1
7. S18...Lock switch.

Claims (1)

[Claims] 1. A VTla unit comprising means for generating a signal indicating that it is in a recording operation state, and a channel? What is claimed is: 1. A magnetic recording and reproducing device comprising: a tuner unit having means for disabling switching; 2. Is there a way to disable the channel switching? 2. The magnetic recording and reproducing apparatus according to claim 1, wherein said tuner unit is provided with a switch for releasing the switchable state.