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    Tape cartridge with auxiliary spring biasing elements
    31.
    发明授权
    Tape cartridge with auxiliary spring biasing elements 失效
    带辅助弹簧偏移元件的带盒

    公开(公告)号：US3642288A

    公开(公告)日：1972-02-15

    申请号：US3642288D

    申请日：1969-03-10

    Applicant: IIT RES INST

    Inventor： CAMRAS MARVIN

    IPC: G11B23/07 ,  G11B23/06

    CPC classification number: G11B23/06

    Abstract: AN ENDLESS LOOP MAGNETIC TAPE CARTRIDGE COMPATIBLE WITH EXISTING PLAYERS WHICH HAVE A SINGLE LATERALLY ACTING RETENTION ROLLER, THE CARTRIDGE CONTAINING AN INDEPENDENT LONGITUDINAL BIAS ELEMENT ACTING ON THE RETENTION ROLLER AND FORWARDLY BIASING THE CARTRIDGE BY REACTION. CONTROLLED LATERAL BIAS MAY ALSO BE PROVIDED. PREFERABLY THE CARTRIDGE IS FORMED IN TWO HALVES OF CONFIGURATION TO RECEIVE AND RETAIN THE BIAS ELEMENT THEREBETWEEN.

    Improvements in or relating to Magnetic Transducer Heads.
    36.
    发明专利
    Improvements in or relating to Magnetic Transducer Heads. 未知

    公开(公告)号：GB1152722A

    公开(公告)日：1969-05-21

    申请号：GB5685968

    申请日：1966-05-02

    Applicant: IIT RES INST

    Inventor： CAMRAS MARVIN

    IPC: G11B5/127 ,  G11B5/465

    Abstract: 1,152,722. Magnetic head. IIT RESEARCH INSTITUTE. 2 May, 1966, No. 56859/68. Divided out of 1,152,721. Heading G5R. The Specification repeats the description of the magnetic head construction shown in Figs. 4-7 of Specification 1,152,721 and the claims are directed to that construction.

    Improvements in or relating to wide band transducing systems
    37.
    发明专利
    Improvements in or relating to wide band transducing systems 未知

    公开(公告)号：GB1148231A

    公开(公告)日：1969-04-10

    申请号：GB1392366

    申请日：1966-03-29

    Applicant: IIT RES INST

    Inventor： CAMRAS MARVIN

    IPC: H04N5/92 ,  H04N9/82

    Abstract: 1,148,231. Television; multiplex signalling. IIT RESEARCH INSTITUTE. 29 March, 1966, No. 13923/66. Headings H4F and H4L. In a magnetic recording system, the audio intelligence modulated signal is converted in mixer 110, Fig. 1, to an audio intelligence modulated signal having a reduced carrier frequency and a bandwidth within the effective range of the recording means, and the resulting reduced carrier frequency audio modulated signal is recorded on the same channel of the record medium as at least a component of the video signal accompanying the audio signal e.g. is recorded with the X or Z signal component of a colour television signal. Signal sources 105- 108 may comprise the circuits of a conventional colour television broadcast receiver circuit, audio signal source 108 comprising the conventional 4À5 Mc/s. frequency-modulated audio signal. The carrier wave from oscillator 111 which preferably constitutes the bias frequency source for the recording system, may operate at 5À5 Mc/s., thus causing the audio information to be conveyed by a 1 Mc/s. carrier at the output of mixer 110. For playback of the recorded signals three heads (101-103, Fig. 2, not shown) are used and the 1 Mc/s. carrier audio signal is separated by means of a tuned transformer and mixed with a 5À5 Mc/s. local carrier to provide a 4À5 Mc/s. frequency-modulated output signal which may be supplied to the sound I.F. and detector stages of a conventional colour television broadcast receiver. A delay line may be provided in the monochrome (-Y) channel. Two channel stereo sound signals may be recorded on the X and Z channels. A twochannel transducing system may be used in which the -Y signal is supplied to one recording head, and the X and Z signals and audio intelligence suitably relatively offset in frequency are supplied to the other recording head. In addition the synchronizing signals may be removed from the -Y channel and the vertical sync. recorded on a carrier having the frequency of the horizontal sync. pulses of the receiver and this carrier may be supplied to the head receiving the X and Z colour information. Alternatively the horizontal and/or vertical sync. pulses may be recorded on a separate channel in demodulated form or as amplitude- or frequency-modulated waves. In a further modified transducing system, the -Y, X, Z and related sound signal are all recorded on a single channel, the carriermodulated signals being obtained directly from an NTSC standard broadcast receiver by heterodyning. For economy a two-colour system may be recorded, e.g. X, R-Y, or I with -Y. Signals reproduced from the record medium may be converted to a carrier of broadcast frequency for coupling directly to a television receiver antenna.

    Improvements in or relating to magnetic transducer systems
    38.
    发明专利
    Improvements in or relating to magnetic transducer systems 未知

    公开(公告)号：GB1137751A

    公开(公告)日：1968-12-27

    申请号：GB332866

    申请日：1966-01-25

    Applicant: IIT RES INST

    Inventor： CAMRAS MARVIN

    IPC: H04N5/782

    Abstract: 1,137,751. Magnetic recording heads. I.T.T. RESEARCH INSTITUTE. 23 Jan., 1966, No. 3328/66. Heading G5R. In a head of the cross field type, particularly for video recording and playback, flux passes across the gap 37 through the tape 11 and also normal thereto, through ferrite member 65, returning via legs (65a, 65b), Fig. 3 (not shown), and housing 60 to the lower part of core 30. Coils 42, 43 are energized with high frequency bias currents to produce fluxes which are opposed across the gap 37 and proceed normal to the tape. The windings are given an unequal number of turns so that a residual field appears across gap 37, and the number of turns may be switched, when it is intended to run the tape in the opposite direction. Coils 40 . . . 43 can be interconnected, Fig. 5 (not shown), for recording and playback. During recording, below the resonant frequency of coil 40, most of the flux from the tape passes through core portions 31a, 32a where the core gap 46 is small. Above the resonant frequency the parallel capacitance makes coil 40 operate as a shorted winding and flux is directed through core portions 31b, 32b, so that coil 41 is effective, gap 47 having a higher reluctance than gap 46. The windings 42, 43 may be connected in series aiding with coil 41 to give increased output above the resonant frequency of coil 40. The core and windings are mounted in non-magnetic metal, such as brass blocks 51, 52 in a magnetically soft material housing 60. The housing 60 is formed with a keeper surface (60a), Fig. 1 (not shown), with an aperture (60b) through which pass the pole faces, auxiliary audio cores, (300, 301) being placed on either side of the main gap. The ferrite member 65 is hinged, Figs. 3 and 4 (not shown) to allow the tape to be removed. In a modification Fig. 7, the high frequency bias winding 157 is arranged around the whole of the upper part of the head. During recording, flux threads coils 154, 155 below their resonant frequencies, and above, flux passes through core 139 so that winding 158 is effective. In a further modification, Fig. 8, (not shown), the main windings are arranged on the two core limbs only. The audio heads may be spaced from the video head, Fig. 9 (not shown).

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