JPH0574268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an imaging device that includes an imaging means for converting an optical image into an electrical signal and a recording member that is periodically driven. However, it does not matter whether the imaging means and the recording member are housed in separate casings that can be separated.

(Prior Art) Conventionally, in this type of device, portability has often been emphasized, and therefore power consumption must be suppressed as much as possible within the limited battery capacity. Therefore, it is desirable that the power switch be operated immediately before or at approximately the same time as the switch for imaging or recording. However, there are generally many mechanically movable parts within an imaging device, and it is extremely difficult to instantaneously start up such movable parts.

One of them is a recording device for recording the output of an imaging means. For example, when considering a recording member such as a rotating magnetic sheet as this recording device, the sheet is driven to rotate at a standard television cycle and is subjected to rotational speed control to achieve a predetermined rotational speed. It also receives rotational phase control at the same time. In this case, the time required for rotational speed control is usually much shorter than the time required for rotational phase control. Therefore, if the time required for rotational phase control can be shortened, the rise problem will be solved.

(Objective) It is an object of the present invention to provide an imaging device that can eliminate the drawbacks of the prior art. In particular, it is an object of the present invention to provide an imaging device that can substantially improve the rise characteristics of a recording device.

(Examples) Hereinafter, the present invention will be explained in detail based on Examples. In this embodiment, instead of controlling the phase of the mechanical movable part, the phase of the imaging means is synchronized with the phase of the mechanical movable part, thereby effectively reducing the phase error to zero.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1 is a photographing optical system, 2 is an aperture, and 3 is a shutter blade. In this embodiment, a rotary shutter such as that used in an 8 mm silver halide film movie camera is used. 4 is a shutter control circuit; 5 is a motor driven by the control circuit 4; and 6 is a FG head which detects the rotational speed of the motor 5. 7 is a PG head which detects the rotational phase of the motor 5; Further, this head 7 outputs pulses at a phase that allows the shutter to shield an imaging device, which will be described later. The _F1 terminal is a terminal that outputs a shutter speed control lock signal, and when the speed is servo locked, a high level signal is output.
8 is an imaging device as an imaging means, which converts an optical image into an electrical signal. An interline CCD is shown in FIG. 2 as an example of this imaging device.
21 is a photoelectric conversion element, 22 is a vertical shift register, and 23 is a horizontal shift register. φ ₁ is a shift pulse for transferring the charge of each photoelectric conversion element to the vertical shift register, φ ₂ is a vertical transfer pulse,
_φ3 is a horizontal transfer pulse. The vertical shift register and horizontal shift register are shielded from light.

Note that the imaging means applicable to the present invention is not limited to the device of this example, but includes all devices that convert an optical image into an electrical signal.

Returning to Figure 1, 9 is the imaging control means.
This is a CCD drive circuit that controls charge storage, transfer, etc. in the CCD 8.

10 is a signal processing circuit, and 11 is a recording signal processing circuit, both of which are timing controlled by a sequence control circuit 18. Reference numeral 14 denotes a recording medium, for example, a disk-shaped recording member, and 17 denotes a head for recording a signal on the medium 14 via a recording signal processing circuit. 13 is a motor serving as a driving means for rotationally driving the medium 14, and 12 is a drive control circuit for this motor.

15 is for detecting the rotation speed of the motor 13
The FG head 16 is a PG head for detecting the rotational phase of the motor 13. PG head media 1
It is arranged so as to output a pulse at a phase corresponding to the vertical synchronization signal of No. 4.

A motor control circuit 12 functions as a detection means, which controls the drive of the motor 13 in accordance with the output of the sequence control circuit 18, and when a servo lock for rotational speed control is activated, the terminal _F2 becomes high level. 19 is a reference clock generator; 20
is a trigger switch for starting recording and also serves as a power switch.

FIG. 3 is a timing chart showing an example of the operation timing of the imaging device shown in FIG. A detailed explanation will be given below based on FIG. 3.

First, when the switch 20 is closed at time _t1 , power is supplied to each part. The CCD 8 is driven by pulses φ ₁ to _{φ 3} from the drive circuit in synchronization with the reference pulse, and charges are accumulated, transferred, and read out in accordance with a field period of 1/60 seconds. However, since the medium 14 and rotary shutter 3 do not reach the predetermined rotational speed, no recording is performed. When the medium 14 is locked at a predetermined rotational speed at time _t2 , F
A high level signal is output from the second terminal, and the sequence control circuit 18 thereafter controls the PG head 16.
The drive circuit 9 is reset in synchronization with the output. (Times t ₃ , t ₄ , t _{5 .} . . ) As a result, instead of matching the phase of the recording medium, the phase of the imaging device is matched, and the time required for phase control is shortened to almost zero. The signals read after time _t3 are recorded on the medium 14 via the signal processing circuits 5 and 6 and the head 12.

In the above embodiments, the recording member is an example of a rotating medium for a fixed head, but it may also be a rotating head for a fixed medium. It goes without saying that the present invention can be applied to any recording member that is periodically driven, even if it is not rotationally driven.

Furthermore, in this embodiment, the imaging device is configured to include a recording member, a detection means, etc., but the imaging device herein includes all devices in which the imaging means, the recording member, the detection means, etc. are connected in relation to each other. , it does not matter whether they are housed in separate housings or not.

(Effects) As explained above, according to the present invention, there is no need to phase control the recording member that rises slowly.
The time from turning on the power to shooting can be shortened, and you will never miss a shot. Furthermore, since there is no need to perform phase control in the relative drive between the magnetic disk medium and the head, there is an advantage that jitter in low frequency components is reduced. Furthermore, since the driving of the imaging device is synchronized with the rotational phase of the recording member, the writing positions on the medium can be aligned, and skew during tracking can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the imaging device of the present invention, FIG. 2 is a schematic diagram showing an imaging device used in the imaging device of FIG. 1, and FIG. 3 is a timing example in FIG. 1. FIG. 3... Shutter blade, 4... Shutter control circuit, 5... Motor, 6, 15... FG head,
7, 16...PG head, 8...CCD, 9...drive circuit as imaging control means, 10...signal processing circuit, 13...motor as drive means,
14... Recording medium as a recording member, 12... Motor drive control circuit as a detection means, 18...
Sequence control circuit.

Claims (1)

[Scope of Claims] 1: an imaging means for imaging imaging light from a subject to obtain an electrical signal; an imaging instruction means for instructing imaging by the imaging means; a recording means for recording on a recording medium driven at a predetermined speed after performing signal processing; a detection means for detecting that the driving speed of the recording means has reached a predetermined stable state; and the imaging means. , an imaging drive means for controlling drive based on a first reference signal having a predetermined period or a second reference signal synchronized with the driving speed of the recording means; The second reference signal is used to drive the imaging means, and after the driving speed of the recording means reaches a predetermined stable state based on the output of the detection means, the second reference signal is used to drive the imaging means. An imaging device characterized by comprising: a control means for driving.