EP0206895A2
Expired / Lapsed
EP
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Video tape recorder
Assignee: Sony Corp
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Filing: 1986-06-06
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Granted: —
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Expires: 2006-06-06
Abstract
Abstract A video tape recorder for recording a plurality of skewed recording tracks on a video tape (TP) include recording heads (H1, H2), an auxiliary head (H3) and an erasing head (He) mounted on a rotary body (RD) of a tape guide drum about which the tape is helically wrapped, a rotary transformer for transmitting signals to the recording heads (H1, H2), auxiliary head (H3) and erasing head (He) rotating with the rotary body (RD), an erase signal generator for generating an erasing signal to be supplied to the erasing head (He) by way of the rotary transformer, and a short circuit arrangement coupled to a signal path connected with the auxiliary head (H3) for short circuiting the latter upon applying the erasing signal from the erase signal generator to the erasing head (He) by way of the rotary transformer.
Inventors
- 👤 Masahiro Shibata
- 👤 Tatsuo Tsujibayashi
- 👤 Hiroyuki Sato
- 👤 Yoshinori Machida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:11
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/00865; G11B15/00; G11B15/02; G11B15/12; G11B15/14; G11B5/024; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/534
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
173 words
A helical scan tape recorder for recording signals in a plurality of skewed recording tracks (Tl, T2, T3,...) on a record tape (TP) comprising: recording head means (HI, H2); auxiliary head means (H3); erasing head means (He); tape guide means including a rotary body (RD) having the record tape (TP) wrapped on the periphery thereof, said rotary body carrying said recording head means, auxiliary head means and erasing head means; rotary transformer means (RTA) for transmitting signals to said recording head means, auxiliary head means and erasing head means rotating with said rotary body; and erase signal generating means (7,8) for generating an erase signal to be supplied to said erasing head means (He) by way of said rotary transformer means (RTA) ; characterized by a short circuit means (STK) coupled to a signal path connected with said auxiliary head means (H3) for short circuiting the latter upon applying said erase signal from said erase signal generating means (7,8) to said erasing head means (He) by way of said rotary transformer means (RTA).
Claim 2
Dependent Claim
173 words
A helical scan tape recorder for recording signals in a plurality of skewed recording tracks (Tl, T2, T3,...) on a record tape (TP) comprising: recording head means (HI, H2); auxiliary head means (H3); erasing head means (He); tape guide means including a rotary body (RD) having the record tape (TP) wrapped on the periphery thereof, said rotary body carrying said recording head means, auxiliary head means and erasing head means; rotary transformer means (RTA) for transmitting signals to said recording head means, auxiliary head means and erasing head means rotating with said rotary body; and erase signal generating means (7,8) for generating an erase signal to be supplied to said erasing head means (He) by way of said rotary transformer means (RTA) ; characterized by a short circuit means (STK) coupled to a signal path connected with said auxiliary head means (H3) for short circuiting the latter upon applying said erase signal from said erase signal generating means (7,8) to said erasing head means (He) by way of said rotary transformer means (RTA).
Claim 3
Dependent Claim
71 words
A helical scan tape recorder as in claim 1, wherein said recording head means includes a pair of magnetic heads (Hl, H2) secured on said rotary body (RD) at respective locations spaced apart by an angle of 180 degrees, and said erasing head means includes an erasing head (He) having a gap wide enough to erase a pair of said recording tracks (Tl, T2, T3,...)formed by said pair of magnetic heads.
Claim 4
Dependent Claim
42 words
A helical scan recorder as in claim 2, wherein said rotary transformer means (RTA) is a flat type rotary transformer having a plurality of concentric windings (Ll, L2, L3) for said magnetic heads, said auxiliary head means and said erasing head, respectively.
Claim 5
Dependent Claim
182 words
A helical scan tape recorder as in claim 1, wherein said recording head means includes first and second recording heads (Hl, H2) spaced angularly from each other on said rotary body by substantially 180 degrees and having head gaps with different azimuth angles, respectively, said first and second recording heads record and reproduce information signals in alternately arranged ones of said skewed recording tracks (Tl, T2, T3,...) during normal transport of said record tape, said auxiliary head means (H3) is arranged immediately ahead of said second recording head (H2) on said rotary body (RD) considered in respect to the direction of rotation (d) of the latter and has a head gap with an azimuth angle equal to that of said first recording head -(HI) and a gap width larger than the gap widths of said first and second recording heads (Hl, H2) so that, when the record tape (TP) is at rest, said first recording head (Hl) and said auxiliary head means (H3) can alternately reproduce information signals recorded in one of said skewed tracks recorded by said first recording head (Hl).
Claim 6
Dependent Claim
55 words
A helical scan tape recorder as in claim 4, wherein said erasing head means (He) is disposed in advance of said first recording head means (Hl) considered in respect to said direction of rotation (d) and has a gap width corresponding to the combined width of two of said skewed recording tracks (Tl, T2, T3,...).
Claim 7
Dependent Claim
134 words
A helical scan tape recorder as in claim 1, wherein said rotary transformer means (RTA) includes first and second sections (RTe, RT3) associated with said erasing head means (He) and said auxiliary head means (H3), respectively; said erase signal generating means includes oscillating means (7), gate means (8) connected between said oscillating means (7) and said first rotary transformer section (RTe) for applying an oscillating output of said oscillating means as said erase signal to said erasing head means (He) when said gate means (8) is enabled, and means for applying an erase timing control signal to said gate means (8) for enabling the latter; and said short circuit means (STK) is responsive to said erase timing control signal for short circuiting said auxiliary head means (H3) whenever said gate means (8) is enabled.
Claim 8
Dependent Claim
101 words
A helical scan tape recorder as in claim 6, wherein said second rotary transformer section (RT3) includes a primary winding connected to said auxiliary head means and a stationary secondary winding having its ends connected to output terminals (1,2); and said short circuit means include transistor means (Ql) having an emitter-collector path connected between said output terminals (1,2) for short circuiting the auxiliary head means (H3) when said transistor means (Ql) is turned on, and means (9, Q2) for turning on said transistor means (Ql) when said erase timing control signal is at a level for enabling said gate means (8).
Claim 9
Dependent Claim
75 words
A helical scan tape recorder as in claim 7, wherein said transistor means includes an NPN-type transistor (Ql); and said means for turning on said transistor means includes a PNP-type transistor (Q2) having an emitter-collector path connected between a power source (+B) and a base electrode of said NPN-type transistor (Ql), and inverting means (9) for applying an inverted version of said erase timing control signal to a base electrode of said PNP-type transistor (Q2).
References Cited (Backward Citations)
No citation records indexed.
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