CN2108350U - Recorder with tape recirculating function - Google Patents

Abstract

The utility model discloses a recorder with tape circulating function. The recorder with tape circulating function is characterized in that a tape cassette is a single disc core, and the beginning end of a tape, which is wound along the disc core can be drawn out to be connected with the finishing end of the tape to form a closed ring; a drive mechanism is not provided with mechanical operation keys, and the tape can record voice and play circularly when tightly clings to a magnetic head gap to move under the dynamic action of the drive mechanism. With the advantages of small size, simple structure, low cost, convenient operation and low failure rate, the utility model is particularly suitable for the language education of young children in families, children learning and recreation as well as for specific occasions, such as the station reporting of vehicles and ships, the narration of exhibition in guide, commodity publicity, etc.

Description

Recorder with tape recirculating function

The utility model relates to magnetic recording system, especially tape videocorder capable of circulation.

The system zero portion that the transports body of known boxlike videocorder is many, complex structure, complex operation, failure rate height, price are expensive, is not suitable for juvenile's study and specific occasion use.

The purpose of this utility model is the tape videocorder capable of circulation to the public provides that a kind of juvenile of being particularly suitable for learns, use amusement and specific occasion.

In order to achieve the above object, the utility model adopts following solution: the tape cassete of a single-deck core, and the beginning of tape can be extracted out with end and be connected to form closed loop, and when tape was close to head gap and is travelled forward, sound can write down and reset; The driving mechanism of a no mechanical operating key, be used to drive tape with constant speed to unidirectional motion; Input end is connecting the amplifier that microphone and magnetic head, output terminal are connected to loudspeaker, can carry out mechanical energy and electric energy, electric energy and magnetic energy are changed mutually, is used to make magnetic recording and playback sound; A ultrasonic oscillator that connects eraser is erased original magnetic recording signal on the tape when being used to record; The entire circuit dry cell power supply also can use interchange to power after rectification; Between circuit and power supply, insert electronic switch, discern the whole story of tape when being used to record, recorded or be in reference position when tape and cut off the electricity supply automatically.

The utility model has the advantages that: volume is small and exquisite, simple in structure, cost is low, easy and simple to handle, fault is few, is particularly suitable for the usefulness that explanation, demonstration were called out the stops, conduct a sightseeing tour, puted on display to language teaching activities of kindergarten children, juvenile's study, amusement and car and boat.

Fig. 1 is the one-piece construction synoptic diagram of tape videocorder capable of circulation.

Fig. 2 is the cut-away view of single-deck core tape cassete.

Fig. 3 is the synoptic diagram of driving mechanism.

Fig. 4 is a circuit diagram.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is the one-piece construction synoptic diagram of tape videocorder capable of circulation.Loudspeaker 2, power light 3, microphone 4 and view window 5 are equipped with in housing 1 front; The fader W of upper side mounting strap power switch, playback switch K ₁With recording initialize switch K ₂Battery case cover plate 6, AC Power supply socket 7 and earphone socket 8 are installed in the right side; Left side mounting strap door 9, tape cassete is inserted by the cassette holder doorway; The intraperitoneal bottom is that movement 11 and printed circuit board (PCB) 12 are installed in battery case 10, middle and upper part; The back side closes up four jiaos by back shroud 13 and tightens sealing with screw.

Fig. 2 is the cut-away view of single-deck core tape cassete.Tape drum is made up of being much of box sheet 14 and following box sheet 15 profile.Tape drum front end has three windows of ABC that in-line is arranged, and is convenient to switch contacts 29 erasers 30, playback head 31 and capstan 32 and stretches into; Adjacent edge end in the hole of windowing has the V-belt box detent 16 of an extrusion modling, and when tape cassete was inserted into tape drum pickup groove on the movement, the tape drum locating wheel on the movement promptly embedded v-depression chucking location; Dish core 17 is conical, the center of circle is provided with loose fit axis hole 18, last box sheet 14 is provided with the axle 19 concentric with axis hole, the lower wall core 17 that drags at tape when the box sheet closes up up and down can be around axle 19 rotations, angle between its periphery and the tape drum baseplane is 55-65 °, form the oxygon groove, tape 20 is reeled from inside to outside along the groove of dish core 17 peripheries, magnetosphere is outside, it is identical with tape 20 that one section width of splicing is extracted at top out, the mylar conductive strips 21 of surface coated with conductive material are guided into by conduction band bar 22 and to be walked around guide wheel 23 by tape drum front end window A, B, C is connected to form closed loop through the end of guide wheel 24 and tape 20; Dress is added with the pinch roller 25 that can rotate freely on the next door of guide wheel 24, and pinch roller 25 bottoms are with dish core 17 driving-belts 26 with dish core 17 bottoms, and to reduce the friction force between tape and the dish core 17, window A, B back dress post the elasticity pressure pad 27 of felt.During work, pinch roller 25, elasticity pressure pad 27 ride over tape 20 respectively on capstan 32, playback head 31, the eraser 30.The purpose that adds one section conductive strips 21 in tape 20 two ends is the whole story of being convenient to discern tape when tape 20 is done the recording use.

Fig. 3 is the synoptic diagram of driving mechanism.As seen from the figure, front portion on movement pedestal 28 is fixed with switch contacts 29, eraser 30, playback head 31 and capstan 32 from left to right successively, wherein switch contacts 29 is two conducting strips that are embedded in the insulating material, the face that touches exposes, when the conductive strips 21 of splicing in closed loop tape 20 move to switch contacts 29 and are close to exposure and pass through, conductive strips 21 are with two conducting strip short circuits of switch contacts 29, and the break-make of control power supply when being used to record has been recorded full or beginning with the bulletin audio tape.Postmedian both sides at magnetic head axis direction movement pedestal 28, tape drum pickup groove 33 is housed, one side of pickup groove 33 also is equipped with an elastic pressure tape drum locating wheel 34, the micromotor 35 of driving mechanism is installed in the limit end of movement pedestal 28, the rotating shaft that is with little power wheel down, by flywheel driving-belt 36 and flywheel 37 sockets.

Fig. 4 is a circuit diagram.Circuit of the present utility model adopts homemade monolithic videocorder integrated circuit, contains preposition amplification A by an inside ₁, front buffer A ₂, power amplification A ₃, automatic electric-level IC and the peripheral component of regulating ALC form.Playback switch K among the figure ₁In playback is the P position.Its course of work is: during playback, from the audio electrical signal of playback head 31 through K _1-1, C ₃, R ₁₂Coupling is from the N of IC ₁₅The pin input, signal is by A ₁Amplify the back from N ₁₃Pin output is through K _1-3, C ₂₆, by passing through C after the W dividing potential drop ₂₇N is sent in coupling ₅Pin carries out power amplification, then from N ₈Pin output is through C ₂₈Deliver to loudspeaker 2 and finish player function.At N ₁₃, N ₁₄External C between the pin ₅, R ₁₅, C ₄, R ₁₀It is negative feedback low-frequency compensation network.During recording, with playback switch K ₁Being allocated to recording is the R position, is recorded electric signal through C by what microphone 4 provided ₁, K _1-2, C ₃, R ₁₂Coupling is from the N of IC ₁₅The pin input, signal is through A ₁Amplify the back and couple directly to A by inside ₂Input end, from N ₂K is passed through in pin output _1-4After be divided into two-way, the one tunnel through C ₈, R ₇, by D ₁, D ₂Voltage multiplying rectifier, C ₁₃, R ₁₃Smothing filtering gets the ALC DC level and injects N ₁The alc circuit of pin is realized recording level control, and another road is through C ₉, C ₇, R ₆, R ₂Deliver to playback head 31 and finish sound-recording function.C wherein ₇, R ₆Be that high audio promotes network.

Recording bias current of this circuit and erasure electric current are by BG ₁, C ₁₀, C ₁₁, C ₁₂, R ₅, R ₄And B ₂The ultrasonic oscillator of forming provides.The erasure electric current is by B ₂ Secondary tap 37 output directly deliver to eraser 30; The recording bias current is through C ₆, R ₃Deliver to magnetic recording head 31.

The complete machine power supply also can use interchange to provide after rectification by dry cell E power supply.During power connection by pilot lamp 3 luminous indications.

In addition, in circuit, also installed recording initialize switch K additional ₂Automatic Electronic Switch with identification tape head and the tail.This Automatic Electronic Switch is by BG ₂Serve as, be connected in the power circuit, launch very that output terminal 39 is connected with load circuit, current collection is input end very, is connected R with the output terminal 40 of power supply ₂₂Be the biasing resistor of base stage, K ₂And after being in series, switch contacts 29 is attempted by between base stage and the ground.K during playback ₂Dial at open position BG ₂Be operated in the saturation conduction state; During recording with K ₂Dial in on-state, when one section that is connected to conductive strips 21 in the closed loop tape touch switch contacts 29 by the time because conductive strips 21 are with two conducting strip contactings of switch contacts 29, just with BG ₂Base earth, BG ₂Base stage loses bias current and is become by saturation conduction and end, and cuts off the electricity supply, and pilot lamp extinguishes, micromachine 35 stalls, thus bulletin people tape has been recorded or has been in reference position.

Claims (4)

1, a kind of tape videocorder capable of circulation mainly is made up of power supply, microphone, amplifier, loudspeaker, ultrasonic oscillator, eraser, playback head, driving mechanism and magnetic tape cassette, it is characterized in that:

A, tape cassete are dish cores, can extract out along the beginning of tape that the dish core is reeled, piece together to go into one section conductive strips that width is identical with tape, be connected to form closed loop with end again, when being close to the head gap motion under the dynamic action of tape at driving mechanism, can record and loop playback;

B, driving mechanism do not have the mechanically actuated key, give the direct transferring power of flywheel that is fixed on capstan one end by driving-belt by micromotor.

2, tape according to claim 1 videocorder capable of circulation, it is characterized in that: the dish core of described tape cassete is for conical, angle between its periphery and the baseplane is 55-65 ° and forms the oxygon groove, right corner is equipped with rotatable pinch roller in the end of front, and the adjacent edge end has the V-belt box detent of an extrusion modling.

3, tape according to claim 1 and 2 videocorder capable of circulation, it is characterized in that: the tape drum pickup groove is equipped with in the both sides above the described driving mechanism pedestal, one side of tape drum pickup groove also is equipped with the elastic pressure locating wheel, when tape drum is pushed into pickup groove, locating wheel promptly embeds under spring pressure in the V-belt box locating slot of tape drum limit end, tape cassete is fixed on the working position, and simultaneously, described pinch roller presses that tape touch capstan, the elasticity pressure pad gently presses tape to touch the slit of magnetic head.

4, according to claim 1 or 3 described tapes videocorder capable of circulation, it is characterized in that: a side of eraser also is equipped with a switch contacts above the driving mechanism pedestal, the break-make of control circuit when being used to record.

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