JPS62193374A - Magnetic recording and reproducing device with built-in television receiver - Google Patents

Abstract

PURPOSE:To make the device small and lightweight and easy to operate by integrating a TV section and a VTR section by a case and using only one common primary side power source switch. CONSTITUTION:Load as a power source of a TV section 10 and a VTR section 11 can be supplied from the secondary side of one transformer by providing winding of a switching transformer for the TV section 10 and VTR section 11 simply, and constitution becomes simple. To make the power source of the VTR section 11 on, reset voltage and power on voltage are generated utilizing voltage supplied to the VTR section 11, and actual voltage of the VTR section 11 is controlled simultaneously by output of a system control microcomputer. Accordingly, the difference of starting voltage applied to motors and circuits at the time of power source on does not occur, and the voltage of the VTR section 11 can be risen surely without causing malfunction.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is directed to television receivers (TV) including monitor televisions and magnetic recording and reproducing devices! The present invention relates to a magnetic recording and reproducing device with a built-in television configured so that a VTR (VTR) is completely integrated therein.

Conventional technology VTRs with TVs are generally used for business purposes, such as training in companies, education in schools, product demonstrations in department stores, shops, etc., and salesmen's demonstrations. It is used for sales promotion (SP) for product explanation, etc. The biggest feature of being able to use a TV and VTR as one unit is that it is easily portable and easy to use, whereas if the TV and VTR were separate, it would not be easy to use due to cable connections, operability, etc. . For SP applications that are used in companies, schools, etc., and that are moved from room to room or carried outside, TV and V
It is better to have an integrated TR that is easier to use. Note that in the present invention, the recording function may not be necessary in terms of functionality, and the recording function may be merely a playback function. Therefore, in actual commercialization, products that are as inexpensive as possible are often required, and VTR sections are often commercialized as playback-only machines.

Also, the TV section may have only a monitor function, or it may have a part of a tuner for receiving broadcast waves, but from the purpose explained above, if it is combined with the playback function of the VTR section, , in many cases, just the function as a monitor TV is sufficient. And the CRT in the TV section
The screen size is selected from 6-inch to 14-inch depending on the purpose, but 6- to 11-inch is convenient for SP use, and 9-inch to 9-inch for other cases.
A type 14 type is considered.

Problems to be Solved by the Invention In a magnetic recording/reproducing device in which a TV and a VTR are configured in one housing, the following points are important in order to provide more useful functions and costs than using them separately. , price, operability, compactness, and portability are considered. To this end, we need to make the power supply part as simple as possible as a commonly configurable part of the TV and VTR.
In addition, it is desired that the device has good operability and is lightweight. At the same time, in the common power supply circuit, the video section includes various circuits and motor drive sections, and due to malfunction and reliability,
It is necessary for the voltages of these parts to rise synchronously with a certain time delay with respect to the turning on of the power switch.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a common power supply unit, and a single transformer is used for both the transformer method and the switching transformer method.
The TV section and the VTR section are operated in common, and the power supply sections for both the TV section and the VTR section are started and shut off by a single primary power switch.

Furthermore, the present invention shapes the rise of the DC voltage supplied to the VTR section when the power switch is turned on, supplies a reset voltage to the system control microcomputer, and creates a control voltage delayed to some extent from this reset voltage to control the system control. The device is configured to start or cut off the voltage of each circuit part of the VTR section from the output of the system control microcomputer by means of supplying it to the input of the microcomputer.

Effect: With the above structure, the number of parts can be reduced as a whole, and the cost can be reduced.

The power supply unit for the TV section and the V'['R section can be started and shut off without any problem by a single primary side power switch, and can be easily operated. Furthermore, VTR
Since the rise of the voltage supplied to the circuit is delayed for a certain period of time, there is no malfunction and reliable operation can be achieved.

Embodiment Below, one embodiment of the present invention will be explained based on the drawings.6 The overall functional explanation of the present invention will be explained based on the assumption that the VTR section is a playback-only device and the TV section is a monitor TV. FIG. 1 shows the front part of a commercialized example of the present invention. 1 is a common exterior part, 2 is a common single primary side power switch, 3 is a power-on display element, 4 is a speaker, 5 is an operation setting section mainly on the TV side, 6 is an operation button section of the VTR section, 7 is a counter of the VTR section, and 8 is a cassette insertion section.

FIG. 2 is a block diagram showing one embodiment of the present invention. In Fig. 2, 9 is a common power supply unit, 10 is a T
11 is a power supply related mechanism section of the V section; 11 is a power supply related mechanism section of the VTR section; and 12 is a power supply section composed of one unit as a whole.

Here, the feature is that the common power supply unit 9 consisting of a power transformer or a switching power supply transformer is composed of one unit, and the secondary side TV unit 10, VT
The R section 11 is designed to have a simple structure as much as possible.

FIG. 3 shows an example of a specific circuit diagram of the present invention.

The functions and operations of the present invention will be explained below based on FIG. FIG. 3 shows a switching power supply system, and the method for stabilizing the voltage is to rectify the voltage generated in a separate winding of the primary winding of the switching transformer 14 with a diode 15 and feed it back to the control section 16. Further, the FBT pulse is controlled by passing it from the separate transformer 17 to the control unit 16, so that it always wanders stably in synchronization with the horizontal synchronization frequency. This configuration is one embodiment of the present invention, and various methods such as a winding detection method, a separate transformer method, or a photocoupler method can be considered for voltage stabilization and switching frequency synchronization setting methods.

Now, when the common power switch 2 is turned on, the rectifier 13
A rectified voltage of 100V or more can be obtained. This voltage is positively fed back to the base side of the switching transistor 18 via the primary winding of the switching transformer 14 and performs one-oscillation operation to perform switching. On the other hand, an FBT pulse is applied to the control unit 16 through the separator transformer 17,
The oscillation frequency is fixed to the FBT pulse.

The voltage flowing through the rectifier diode 19 connected to the first secondary winding of the switching transformer 14 is
0 is applied to the F[3T section 20 and a switching operation is performed to apply a high voltage to each section of the CRT 21 and a low voltage (about 20 V) to each section of the signal processing section 22.

In addition, the voltage of about 14V rectified by the rectifier diode 23 connected to the second secondary winding of the switching transformer 14 is used to drive the cabtan motor in the upper part of the VTRTR part, and is stabilized at 5V. The voltage is stabilized to 5V by the converter circuit 24, and is applied to the servo system controller and the video circuit through switch circuits 25 and 26. The reset voltage generating section 27 detects the rise of 5V of the output of the 5V stabilizing circuit 24, generates a reset voltage that maintains Ov for a slightly longer time than the rise of 5V, and applies it to the reset input terminal of the system control microcomputer 28.

Power-on circuit 29 that controls power-on of the microcomputer 28
uses the rise of 5V mentioned above to generate the reset voltage generator 2.
A signal further delayed than the reset voltage 7 is applied to the input terminal of the system control microcomputer 28 to turn on the power.

FIG. 4 shows the timing of the above operation, (A) shows the rising waveform of 5V, (B) shows the reset voltage waveform, and (C) shows the power-on command voltage waveform at the input terminal of the system control microcomputer 28. , (D) shows the power-on voltage waveform at the output end of the system control microcomputer 28 which is controlled by software with a certain amount of time delay in response to the control voltage shown in (C).

Also, approximately 18V is rectified by a rectifier diode 3o connected to the second secondary winding of the switching transformer 14.
The rough voltage is stabilized to +2V by the 12V stabilizing circuit 31, and used in the servo section and the audio section.

In the above configuration, by applying a reset voltage to the system control microcomputer 28 using the rise of 5V and further adding a delayed power-on control signal, the 12V stabilizing circuit 31.5V switch is connected to the output terminal of the system control microcomputer 28. The control voltage for the circuits 25 and 2G is obtained, and the configuration is such that the voltage on the upper part of the VTRTR section rises.

Further, according to the above configuration, the load as one source on the TV section 10 and the VTRTR section can be supplied from the secondary side of one transformer by simply providing the winding of the switching transformer 14 on the TV section 10 and the VTRTR section. It can be configured easily.

In addition, as a method of turning on one power source on the VTRTR section, the voltage supplied to the TR section 11 is used to generate a reset voltage and a power-on voltage, and the actual VTRTR section 1 voltage stem is Because they are controlled simultaneously by the control microcomputer output, there is no difference in the rising voltage applied to each motor and each circuit when the power is turned on.
There is no malfunction, and the voltage on the VTRTR section can be raised reliably.

An example of a specific circuit of the present invention has been explained above with reference to FIG.
According to the present invention, in an integrated TV/VTR system, the power supply circuit can be configured to be simple, inexpensive, and operationally reliable. In addition, there is only one common power switch, and in terms of operability, the autoplay function automatically starts playback as soon as a cassette is inserted, making it possible to connect the TV section and VTR.
This is superior to the separate type.

In addition, for safety reasons, the primary side of the power supply for the TV section is generally shut off.
In the VTR section, the secondary side is shut off.

In the present invention, considering operability, safety, power consumption, etc., a method of shutting off the primary side was implemented as a reliable method.

Effects of the Invention According to the present invention, the TV section and the VTR section are integrated into one housing, and the overall number of parts can be reduced, resulting in lower cost, smaller size, and less waste. Furthermore, since there is only one common primary power switch, the effect of easy operation can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view of a product of an embodiment of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is a circuit diagram showing an example of a specific embodiment of the invention, and Fig. 4 is a timing chart of the voltages of each control unit with respect to the rise of the 5V system voltage of the VTR unit. 2... Primary side power switch, 9... Common power supply section,
10...TV section, 11...VTR section, 14...switching transformer, 1G...switching stabilization control section, 17...separate transformer for frequency control, 1
8...Switching transistor, 19...TV section rectifier diode, 23°30...VTR section rectifier diode, 24...5V stabilization circuit 1, 25.26...5
v switch circuit, 27... System control microcomputer reset voltage generation section, 28... System control microcomputer, 29... System control microcomputer power-on circuit, 31... 12V stabilization circuit agent Yoshihiro Morimoto 7 Figure J Figure 2] 1L -/-11 Soj Yuuda t-1y:p 2-12 Guzo ρ1 Cloud Sange Suipuke! j--rVflff4'f'#bQelfjP1i-
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Claims (1)

[Claims] 1. A television receiver (TV section) and a magnetic recording/reproducing device (VTR section) are integrated in the same housing, the power supply circuit section of both is configured in common, and one primary A magnetic recording/reproducing device built into a television receiver configured to start or cut off power supplied from the secondary side of a transformer to loads of a TV section and a VTR section by turning only the side power switch on and off. 2. Shape the rise of the DC voltage supplied to the VTR section when the power switch is turned on, supply a reset voltage to the system control microcomputer, and create a control voltage that is delayed to some extent from this reset voltage to control the system control microcomputer. The built-in magnetic recording device of a television receiver according to claim 1, characterized in that the means for supplying to the input is configured to start or cut off the voltage of each circuit part of the VTR section from the output of the system control microcomputer. playback device.