JPS6019372A - Vtr incorporating with camera - Google Patents

Abstract

PURPOSE:To attain small size and light weight by providing the constitution recording an effective image pickup signal of an image pickup device at a section corresponding to a part in contact with a tape, a time axis expanding circuit expanding the time axis of an output signal of the image pickup device and a display device displaying this output to give interchangeability with a conventional rotary 2-head type VTR. CONSTITUTION:A reproduced video signal appears at an output of an FM demodulating circuit 18 and the signal is fed to a reproducing terminal 15P of a recording/reproduction changeover switch 14. The time axis expansion is applied to an output of the recording/reproducing changeover switch 14. A time axis expanding circuit 19 expands the time axis of the video signal in a horizontal scanning frequency into a video signal of the normal horizontal scanning frequency. Thus, the recorded video signal or the reproduced video signal is monitored by applying an output of the time axis expansion circuit 19 to a small sized black- and-white cathode-ray tube 20. Further, an output signal of the time axis expansion circuit 19 is extracted also at a video output terminal 21. A reproduced picture of a VTR is observed by using the monitor receiver in connecting a normal monitor receiver to this video output terminal 21.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a camera-integrated VTR in which an imaging device and a VTR are mechanically integrated.

"Background technology and its problems" As one of the Vi'R for home use, magnetic tape is wound on a tape guide drum with a winding slightly larger than 1800 mm (=J, arranged at 180' square intervals). VTRs are widely used in which two rotary heads are rotated at a frame frequency, and the rotary heads alternately slide against a magnetic tape running at a predetermined speed. Although it was possible to use a portable type configuration separate from the camera, it was not possible to configure the camera into an integrated configuration.

In particular, the mechanical parts of the tape guide drum and the tape guide path associated therewith have been a factor that hinders the reduction in size and weight of VTRs.

Therefore, it is compatible with conventional rotating two-head type VTR,
V"l' that allows the device to be smaller and lighter
R is proposed to be 4. This has a magnetic tape wound approximately 300° in an Ω-shape around a tape guide tram, has one head that rotates at the field frequency, performs horizontal scanning at a horizontal scanning frequency higher than the normal frequency, and has an overscan. The output signal of the camera that performs the operation is recorded by the above-mentioned head. As a result, the diameter of the tape guide drum can be reduced, and a VTR of a small size can be realized.

However, the horizontal scanning frequency of the camera is not standard,
However, due to overscanning, it was not possible to monitor using an electronic viewfinder using a small cathode ray tube. Therefore, an optical viewfinder is used. Optical viewfinders have the disadvantage that, unlike electronic viewfinders, it is not possible to monitor the video signal output of the camera. The problem with the viewfinder is that the brightness is insufficient, there are restrictions on the mechanical arrangement, and it becomes difficult to see if the viewpoint is shifted even slightly from the optical axis. Atsu Puko.

1. Purpose of the Invention This invention is a conventional rotary 2-\nod type VTR and -ff,
A camera with a camera that performs special scanning, which is designed to be compact, light and dark, and to be compact, light and dark. The object of the present invention is to provide a device equipped with an electronic viewfinder.

In addition, this invention makes it possible to view the signal of the camera-integrated VTI3 on a normal monitor receiver, and makes it possible to view the signal of the camera-integrated VTI3 with a recording and playback function.
．． ! The purpose is to serve the public.

[Summary of the invention 1 This invention provides an imaging device and a VTR that are integrated into one,
In a VTR, the tape is wound around the tape guide drum in an Ω-shape, and the section corresponding to the part that does not come into contact with the tape within one rotation of the head corresponds to the invalid imaging section of the imaging device, and the section that does not come into contact with the tape. a time axis expansion circuit configured to record an effective imaging signal of the imaging device in a section corresponding to a portion corresponding to a portion of the image pickup device, and a time axis expansion circuit that expands the time axis of the output signal of the imaging device; The display device monitors the image signal.

Further, the present invention selectively supplies one of the output signal of the imaging device and the reproduced output signal of the VTR to the time axis expansion circuit.

Embodiment FIG. 1 shows the arrangement of rotating heads in an embodiment of the present invention. In FIG. 1, 1 indicates a tape guide tram, and the magnetic tape is 2 is wound with a winding angle θ (270° x θ x 360°). The magnetic tape 2 is wound diagonally around the circumferential surface of the tape guide drum 1 and runs in the direction of the arrow at a predetermined speed, for example, 20 mm/sec. Tape guides 3 and 4 are provided for winding the magnetic tape 2 in a predetermined relationship around the tape guide drum 1.

Rotary heads 5A and 5B come into sliding contact with magnetic tape 2 wound around tape guide drum 1.

The rotary heads 5A and 5B operate at the regular 71-wavelength frequency-s.
It is rotated counterclockwise with ec. Although not shown in the figure, the tape guide drum 1 is composed of a fixed drum and a lower drum, and a cylindrical head disk that rotates between the two. , 5B are made to protrude.

Time t1= The heads 5A and 5B have their respective gaps extending in different directions, and are configured to suppress crosstalk components from adjacent trunks by azimuth loss during reproduction. Since the two rotary heads cannot be provided at the same position 11σ, they are provided at a position 1d spaced apart by f'+interval α. In this embodiment, the angular spacing α is χ;
is selected so that it is delayed by 1.5T. This ′l゛ is a modified 1 expressed by the following formula.
The horizontal period is β.

(fl is the standard horizontal scanning frequency in the NTSC system.) Since the rotating heads 5A and 5B need to be placed extremely close to each other, they are integrally bonded together as shown in FIG. The mutual gap distance G is set to a predetermined value.

FIG. 3 shows a conventional helical scan rotary head type VT for reproducing video signals recorded according to the present invention.
It shows R.

The magnetic tape 2 is wound around the circumferential surface of the tape guide drum 6 with a winding angle slightly larger than 180°.
Two rotating heads 7A and 7B are arranged opposite to each other with an angular interval of
are in sliding contact with the magnetic tape 2 alternately.

The directions in which the gaps of the rotary heads 7A and 7B extend coincide with those of the rotary heads 5A and 5B. The rotating heads 7A and 7B are rotated with a frame frequency,
Each reproduces one field of color video signals. The running speed of the magnetic tape 2 is assumed to be equal to the speed in one embodiment of the present invention.

FIG. 4 shows a recording pattern formed by recording a color video signal according to an embodiment of the present invention. First, the rotary head 5A comes into sliding contact with the magnetic tape 2, and one field's worth of recording signals is recorded within a winding angle of 0, thereby forming the video 1 rack 8A. During this period, no recording current is supplied to the (11) rotating head 5B. Then, in the next rotation, recording current is supplied only to the rotating head 5B during the period of the winding angle θ, so that The recording signal for the field is recorded as video 1 rack 813. This video 1 rack 8Δ, 8B is as follows:
This corresponds to the recorded pattern formed by the conventional GoR with the configuration shown in FIG. 3! 1. The length of video 1/rack 8 A in the extending direction of 813.
The angle formed by the extension line of the trunk with respect to the direction of extension of the magnetic tape 2 is set to the same value as in the conventional case. for that,
The winding angle θ is set to a predetermined value, and the diameter of the tape guide drum 1 is set to a predetermined value.

In the video 1 racks 8A and 8B, video signals for field 1 are recorded, and in addition, video signals for one and a half intervals must be recorded in the video tracks 258A and 8B. However, when the magnetic tape 2 is wound around the tape guide drum 1 over 360°, it is necessary to record horizontal sections that are an integer multiple. Therefore, it is assumed that the winding angle θ satisfies the equation of 1. - As an example, (0=300°). At this time, (N=31
5).

The operation of one embodiment of the present invention will be described with reference to FIG.

■ As mentioned above, one regular field period (nsec)
The rotating heads 5A and 5B rotate. FIG. 5 shows the time IQI+ based on the timing when one rotary head 5A comes directly to the position i corresponding to the beginning of the range of the winding angle θ. Then, while the rotating head 5A scans the range of the winding angle θ (0 to 262.5 T at time ill+)
Then, a video signal for one noise rotation (period of 262,51") from the camera and a corresponding recording signal are supplied to this 1!J1 rotation 5A as shown in FIG. 5A. ,
If the rotating heads 5Δ and 5I3 are in the same position, time +l
At ll+1, a recording signal corresponding to the image signal for the next one field is recorded from a timing not shown at 315T.

However, as already mentioned, the rotary head 5B is located at a position (1't = 1't) away from the rotary head 5Δ by an angle α. A recording signal that corresponds to the video signal of the next field is recorded from the timing that is delayed by JL.

From the timing of the next 630 'I', the rotation is ＼
Recording is performed by the RAD 5A, and similar operations are repeated. The field FA recorded by the rotary head 5A and the field FB recorded by the rotating gutter 5B are 1 and the vertical synchronization signal S shown in FIG. 5B.
In one embodiment of the invention, a color video camera is driven by a vertical synchronization signal as shown in FIG. 5B. That is, the vertical deflection current of the horn video camera is as shown in FIG. 5C. In Figure 6, 9
shows the effective screen of the imaging surface of a color video camera. Vertical scanning of the image pickup tube is performed by a vertical side current shown in FIG. 5C, and its horizontal deflection is synchronized with a horizontal synchronizing signal of (-) frequency.

First, in the field FA, as shown in Figure 6A, 26 lines from the 1st line to the first half of the 263rd line
2.5 horizontal scans are performed, and then 54 horizontal scans (overscan) are performed outside the effective screen 9, as shown by broken lines. Then, in the field FB, as shown in FIG. 6B, horizontal scanning starts from the upper center of the effective screen 9, and 262.5 horizontal scans are performed up to the 579th line. Like, 63
Overscanning is performed 51 times up to line number 0. Then, as shown in FIG. 6A again, the effective screen 9
Return to the top left corner of. As understood from this Figure 6,
In the image pickup tube, interlaced scanning is performed.

The rotary head 5B may be arranged to move forward by an angle α relative to the rotary head 5A. In that case,
Recording may be performed by the rotary head 5B for a period of 262.5T, which is a timing 1.5T earlier than the timing at which recording is started by the rotary head 5A.

The above-mentioned VTR is mechanically integrated with a color video camera and has the electrical configuration shown in FIG. 7th
In the figure, 11 is an imaging section made of an image pickup tube or a solid-state imaging device, and 12 is a video amplifier. Here, it is assumed that the output of the imaging unit 11 is only a black-and-white signal (luminance signal). As described above, the imaging section 11 performs the scanning shown in FIG. 6 using the frequency f1-1' higher than the normal frequency and the vertical synchronizing signal SV shown in FIG. 5B.

The output of the video amplifier 12 is supplied to the FM modulation circuit 13 and the recording side terminal 151 of the recording/reproduction changeover switch 14 . An FM modulated video signal obtained from the FM modulation circuit 13 is supplied to the rotary heads 5A and 5B via an RF switching circuit (not shown), a recording/reproduction changeover switch 16, and a rotary transformer 17, and is then applied to the magnetic tape 2. recorded in The reproduction outputs of the rotary heads 5A and 5B are supplied to an FM demodulation circuit 18 via a rotary transformer 17, a recording/reproduction changeover switch 16, and an RF switching circuit (not shown).

A reproduced video signal appears at the output of the FM demodulation circuit 18.

This reproduced video signal is supplied to the reproduction side terminal 15P of the recording/reproduction changeover switch 14. The output of the recording/reproduction changeover switch 14 is expanded in time.

This time axis expansion circuit 19 has fH'. The video signal at the horizontal scanning frequency is time-axis expanded to a video signal at the regular horizontal scanning frequency fH.

Therefore, by supplying the output of the time axis expansion circuit 19 to the small black and white cathode ray tube 20, the recorded video signal or the reproduced video signal can be monitored. Each frequency of horizontal scanning and vertical scanning of this cathode ray tube 20 is
It is considered a normal value. The output signal of the time axis expansion circuit 19 is also output to the video output terminal 21. If a normal monitor receiver is connected to this video output terminal 21, the reproduced images of the VTR can be viewed through this monitor receiver.

FIG. 8 shows an example of the 113-axis extension circuit 19, in which recording (
(or playback) video signal is supplied. This input video signal is supplied to the input video signal 33a of the input camera isolation circuit 32 and the synchronization separation circuit 34. A horizontal synchronization signal of frequency fH' is separated by a synchronization separation circuit 34, and this horizontal synchronization signal is supplied to a PLL (phase locked loop) circuit 35. This PL, L circuit 35 generates a write clock pulse horse synchronized with the horizontal synchronizing signal.

Further, 36 is a clock pulse generation circuit that generates the read clock pulse P2. Input/output clock pulse P
1 and read clock pulse I) 20 cycles have been collected. The input terminals of variable delay paths 3γ and 38 are connected to the output terminals 33b and 33c of the input switch circuit 32. As these variable delay circuits 37 and 38, for example, CCDs can be used.

Variable delay circuits 37 and 38 receive write clock pulse I
] 1 to input the input video signal, and the read clock pulse P2 to input the distorted video signal to i.
7'c-out operation is performed. These variable delay circuits 37
and 38 are supplied to input terminals 40b and 40c of an output switch circuit 39, respectively. The output terminal 40a of this output switch circuit 39 is derived as the output terminal 41 of the time 11tl+expansion circuit 19. The input switch output switch circuit 39 is connected to the switch control circuit 42.
controlled by In synchronization with this switch control, the variable delay circuits 37 and 38 output the write clock pulse P1.
and one of the read clock pulses P2 is selected as the clock pulse.

The input switch circuit 32 and the output switch circuit 39 are controlled so that a video signal is supplied to one of the variable delay circuits and taken out. In the states of the switch circuits 32 and 39 shown in FIG. 8, a video signal is output to the variable delay circuit 37 by the write clock pulse Pl, and a video signal is output from the variable delay circuit 38 by the read clock pulse l)2. Ru.

FIG. 9A is an image taken at the horizontal scanning frequency f11'.
As mentioned above, the 12 interval of 262.5T is the valid imaging signal, and the remaining interval within -5ec is the invalid (over-0 barscan) interval. . This human-powered image 1β1.1 is inserted into one of the variable delay circuits 37 and 38, and when read out, as shown in FIG. 9B, the normal horizontal scanning frequency and vertical scanning frequency are adjusted. converted to a video signal.

Note that the above explanation has been made regarding the case where the output of the imaging section 11 is only black and white, but the same is true even in the case of a color video signal if only the luminance signal is focused on. Alternatively, a color monitor image may be obtained by expanding the color video signal on the time axis.

"Application Example" The present invention can also be applied to the case of recording a color video signal of a PAL system other than the NTSC system.

However, the present invention can also be applied to cases where liquid crystal is used as a display device.

"Effects of the Invention" According to the present invention, in order to reduce the size and weight of the VTR, an electronic viewfinder is provided which can monitor the video signal output of the camera even when the camera is equipped with a special scanning method. A camera-integrated VTR can be realized. Therefore, all of the problems that occur when using an optical viewfinder, such as inability to monitor video signal output, insufficient brightness, mechanical layout constraints, and difficulty in viewing, can all be solved. This invention can display the date and time, battery check, aperture, white balance, dew condensation alarm, etc. in the viewfinder. Further, according to the present invention, the reproduction output of a VTR can be reproduced by a normal monitor receiver, and a camera-integrated VTR having not only a recording function but also a reproduction function can be realized.

[Brief explanation of drawings]

1 and 2 are a route map and a front view showing the arrangement of a rotary head and a specific configuration of two rotary heads according to an embodiment of the present invention, and FIG. 3 is a two-head rotary VTR for playback.
FIG. 4 is a route map used to explain the recording pattern of an embodiment of the present invention; FIG. 5 is a time chart used to explain the recording operation of an embodiment of the present invention;
FIG. 6 is a route diagram used to explain beam scanning in an embodiment of the invention, FIG. 7 is a block diagram of an embodiment of the invention, and FIGS. 8 and 9 are diagrams of an embodiment of the invention. FIG. 3 is a block diagram of a section and a waveform diagram used for explaining its operation. 1...Tape guide drum, 2...Magnetic tape, 5A, 5B...Rotating head, 8
A, 813... Hideo track, 11...
. . . Imaging unit, 14. 16 . . . Recording/playback selector switch, 19 . . . Time axis expansion circuit, 2
0......Cathode ray tube.

Claims (1)

[Claims] (1) An imaging device and a VTR are provided integrally, and the above-mentioned VT
R means that the tape is wound around the tape guide drum in an Ω shape, and a section corresponding to a portion that does not come into contact with the tape within one rotation of the head corresponds to an invalid imaging section of the imaging device, and also makes contact with the tape. a time axis expansion circuit for expanding the time axis of the output signal of the imaging device; and displaying the output of the time axis expansion circuit. A camera-integrated VTR characterized by having a display device (2) An imaging device and a VTR are integrally provided, and a tape is wound in an Ω shape around a tape guide drum.
A configuration is provided in which a section corresponding to a portion that does not come into contact with the tape during rotation corresponds to an invalid imaging section of the imaging device, and an effective imaging signal of the imaging device is recorded in a section that corresponds to a portion that comes into contact with the tape. a selection means for selecting one of the output signal of the imaging device and the reproduced output signal of the VTR; a time axis extension circuit configured to extend the time axis of the output signal of the selection means; A camera-integrated VTR9 characterized by comprising a display device for displaying the output of an expansion circuit.