JPS6096971A - Electronic still camera - Google Patents

Abstract

PURPOSE:To securely confirm whether or not the recording can be executed when a magnetic disc where 2 different frequencies are mixed and used is employed by checking the recording reproduction two times with the signal of 2 different frequencies. CONSTITUTION:A picture signal from a solid-state pickup element 3 focused by the lens 2 of an electronic still camera 1 is supplied through a modulator 4 and a recording amplifier circuit 5 to a magnetic head 6. Switches 8 and 9 are connected between the circuits 4 and 5 and between the circuit 5 and the head 6, respectively, and an oscillation circuit 10 is connected to the switch 8 and a reproduction amplifying circuit 11 of a checking circuit 18 is connected to the switch 9 so that they can be switched, respectively. 2 kinds of signals different in frequency are alternately oscillated at the circuit 10, and when the operation of the camera 1 is checked, the signals are added successively by the switch 8 to the head 6. The switches 8 and 9 are respectively controlled by controlling the control circuit 16 of the circuit 18, and the recording reproduction is checked two times by a different frequency and the confirmation whether or not the recording can be executed is securely performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an electronic still camera that prevents recording errors due to malfunctions of magnetic heads or recording circuits.

BACKGROUND TECHNOLOGY The Toyo still camera uses a disk-shaped magnetic disk as a recording medium to magnetically record still images.For example, dust in the air or magnetic powder peeled off from the surface of the magnetic disk gets stuck in the magnetic head. If this occurs, malfunctions occur, similar to when the recording circuit malfunctions, resulting in recording errors. However, conventional electronic still cameras
It is not until you play back the recorded image that you realize that there has been a recording error, which not only delays the ability to respond to malfunctions in the magnetic head or recording circuit, but also prevents the image taken at the perfect shutter opportunity from being displayed. It had drawbacks such as becoming a useless trap. In addition, in conventional Shigeko still cameras, if the travel circuit malfunctions, previously recorded signals may not be erased sufficiently when recording signals on the magnetic disk, and the previous recording surface may remain, or the image may be distorted. The recording circuit is not usable because it may not be recorded, and furthermore, it is not possible to check in advance for such malfunction of the recording circuit, which has the disadvantage of causing inconvenience to the user.

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks, and before starting photography, a check circuit is activated and the frequencies are different. Two types of No. 45 are sequentially recorded e) and the playback level is checked when played back. Malfunctions of the magnetic head or recording circuit are discovered from abnormalities in the playback level, and recording errors can be prevented before 4S. The purpose is to provide a digital still camera.

In order to achieve this object, the present invention provides a magnetic head for magnetically recording a line of signals in a still image sent via a recording amplifier circuit onto a recording medium, and a frequency control circuit for recording amplifier circuit No. 611. An oscillation circuit that supplies an oscillation signal of -14 η1A, a reproducing amplifier circuit connected to the magnetic head +iii, and a recording medium σ) on the same track.
By checking the +lT raw level of the above 4I) raw amplifier circuit of two types of oscillation signals with different permitted htj station waveforms, and sequentially recording and reproducing these 24+lLm oscillation signals of different frequencies. , first, when the oscillation signal of the first frequency is recorded and reproduced, only the oscillation signal of the first frequency exceeds the specified reproduction level, and the postscript of the recording of the excavation point εc is found. When the oscillation signal of the 2nd frequency is recorded and reproduced, the oscillation signal of the 7th frequency recorded immediately above exceeds the specified 1j raw level, and the oscillation signal of the 1st frequency recorded before that is exceeded. , recording is possible only if the playback level is below the specified playback level.
According to the present invention, an oscillation circuit connected to a recording circuit that supplies a signal related to a still image to a magnetic head is provided. , the frequencies are different. By supplying two types of oscillation signals to the magnetic head by, for example, switching an external switch, and sequentially recording and reproducing these two types of luminous intensity signals of different frequencies, the oscillation of the first frequency is first performed. When a signal is recorded and reproduced, only the oscillation signal of the first frequency exceeds the specified reproduction level, and when the recording and reproduction of the oscillation signal is recorded and reproduced as an oscillation signal of the frequency described in 2 below, The previously recorded oscillation signal of the seventh frequency is below the specified playback level, and the oscillation signal of the second frequency recorded later (
Only if the FT number exceeds the specified reproduction repeno...
Since the configuration is configured to output a recordable signal, in cases other than the above, the gear lug of the magnetic head may be clogged,
! It was immediately discovered that the I8@amplifier circuit was malfunctioning, and this made it possible to prevent recording errors due to malfunctions in the magnetic head and recording amplifier circuit. By checking the recording and playback twice with signals of λ different frequencies, it is possible to check whether the recording is recorded with a mixture of these λ frequencies (even if a flat recording medium is used, whether the recording 0f function is possible or not). 〇BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. The figure is a schematic diagram showing an embodiment of the secondary still camera of the present invention.

In the figure, an electronic still camera/i'i receives a video signal from a solid-state image sensor 3 focused by a lens 2.
The configuration is such that the signal is supplied to a magnetic head (B) via a modulation circuit (G) and a recording amplifier circuit (J), and is concentrically recorded from the magnetic head (G) onto a magnetic disk (7) serving as a recording medium. The solid-state image sensor jli has pixels arranged in a matrix, and signals sequentially read out from these pixels using a predetermined scanning method are added with a synchronization signal in a modulation circuit and recorded as a television signal by a 771 circuit. supplied to j.

Here, the modulation circuit da and the recording amplifier circuit ll! A switch 2 is connected between the I5 and the recording 771 circuit j and the magnetic head 6, and the switch JK is connected to the oscillation circuit 10, and the switch ? VC is 1) Raw Ang circuit //
are connected to each other so that they can be cut and sprayed. Oscillation circuit IO
generates two types of oscillation signals having different frequencies, such as fa and fb, and sequentially supplies these oscillation signals to the magnetic head B through the switch 1 when checking the operation of the electronic still camera.

1■J raw amplifier circuit//VCIf,, each band 1 wave 1ijl path/s a, /,, 2b having frequencies fa and fb in the p wave band are connected, and each band wave circuit t2a
, 7.2b are connected through waveform shaping circuits /Ja and /Jb, respectively: 'It E[E comparison circuit /4! It is connected to a, /&b. Voltage comparison circuit/ηa.

1ttb are reference voltage generation circuits/a, /, t, respectively.
b is connected to the control circuit/AVC, and the outputs of the voltage comparison circuits /ηa, /l/, b are compared based on the voltage generated in the Furuken Narita generation circuit /Sa, /, tb, The comparison result is supplied to the control circuit/6.

Here, the reproduction level of the it'll rdl1 circuit/Al'i, zeta generation amplifier circuit l/ is the minimum required 2'
If it is below a certain level, it is determined that there is an abnormality. The result of this ′-ra constant presence is ilj! I supine circuit //,
The display circuit/7 connected to 1' is lit and flooded. In addition,
The control circuit 16 has a switch f,
? (controls the operation of the dragon circuit 10).

In the case of this embodiment, the regenerative amplifier circuit/1, the band Toba circuit/
2a, /2b, waveform shaping time j! fi/J a, /J
b, jl<pressure comparison circuit lμa, / squirrel, 4: Mulberry I
The pressure generating circuit/, ta, Otori b, 1llll groaning circuit/6, display circuit/7, etc. constitute the check circuit tg.

If you want the check circuit/g to operate f, press the check button (
(not shown). As a result, the first stage of the check is started, and first, the switch J'l/1''-source 4-pin circuit io
The solid state element 3 and the modulator circuit are connected side by side, and the light +W11 is made from the recording angle circuit.

Next, the oscillation circuit i is activated by a command from the control circuit/6.

generates an oscillation signal of the first frequency fa, and this oscillation signal is recorded on the magnetic disk 7 via the magnetic head B via the switch ♂, the recording amplifier circuit ♂, and the switcher.

When the recording of the oscillation signal of the first frequency fa is completed, the switch switches to the reproduction amplifier circuit ti 1llll VCl
, 7J, the generation of the oscillation signal just recorded is repeated once. At this point, the control circuit /l is determined to be 1 abnormality if the specified reproduction level is not obtained from the comparison result of di, pressure ratio 1 bite circuit Aa, and )3 is set to 44
Only when the r raw level is obtained is JJJ, proceed to the check λ stage. Amplifier circuit! Next, output the oscillation signal of the second frequency fb from the oscillation circuit lO, and use the same track used in the first step to check the magnetic disk? Write the IC (-).

Table 1: Switch the switch to the reproduction circuit l/1 law, and generate the oscillation signal I+1 of the second frequency fb, which was written just before vc, f≠.

In this case, the IIHI control circuit/6 determines whether the specified playback level is determined from the comparison result of the comparison circuit 141).
! ), as in the first stage of the check, please check
Let's do one.

Also, even if the specified playback level is achieved, E to F:
From the comparison results of E comparison circuit /// and a, it is determined that the oscillation signal of the first frequency fa of t'+iJ circular τI2 is the specified
For Ichijimaai who has been born 1 [) above the raw level, 74 is given. That is, in the check λ stage, only the signal recorded immediately before is checked to see if the normal 111 raw level is iσ, and at the same time, due to an abnormality in the recording 771 circuit j, etc., inconvenience No. 46 remains unerased. It is also checked to see if it has been played.

In this way, the check circuit /g checks for clogging of the gap of the magnetic head B and malfunction of the recording amplifier circuit // by the λ-stage check operation, and if any abnormality is found, the display circuits t7Vc, W4 The normal display is lit, and if there is no 4°4 constant, the good display is lit to show that recording is possible.

As explained above, there are two types of oscillation circuits connected to the magnetic head 6Vc and the oscillator circuit lO connected to the fte8 a/g circuit j that supplies signals related to still images. By making it possible to supply the oscillation signal of the first frequency to the magnetic head B, and generating four signals of these two different frequencies (110th order), the first frequency ? If the oscillation signal of the oscillation signal fa is generated (11), only the oscillation signal of the first frequency fa exceeds the specified reproduction level, and the frequency f1 of the recording and reproduction of the oscillation signal is゜I recorded and reproduced the name of my partner.'' The first frequency FA recorded on 11J is at the specified 11J raw level, and the second frequency FB recorded later is included. Since the groove is configured to output a recordable signal only when the oscillation signal exceeds the specified playback level, in other cases than the above, the 1m head gap may be clogged or the recording amplifier circuit may be damaged. It is immediately clear that a malfunction has occurred in the magnetic head or the recording amplifier circuit, and thereby it is possible to prevent recording errors due to malfunctions in the magnetic head or the recording amplifier circuit.

Also, this 5[J different frequency signals - Fatty Circular U
By checking the playback, even when using a recorded magnetic disk on which the above two frequencies are mixed, it is possible to check whether recording is possible or not, and accidental check failures can be avoided. ! +' (deleted.

The explanatory diagram of the cylinder C1i with one nail is a schematic configuration diagram showing one embodiment of the 11L child still camera of the present invention.

/...electronic still camera, j...recording amplifier circuit,...magnetic head, 7...magnetic disk, 10...
Oscillation circuit, l/...ijL raw amplifier circuit 7g...
Check circuit,.

patent applicant

Claims (1)

[Claims] a magnetic head that magnetically records signals related to methyl images sent through a recording amplifier circuit on a recording medium;
An oscillation circuit that supplies two types of oscillation signals with different frequencies to the recording amplifier circuit, a reproduction amplifier circuit connected to the magnetic head, and the frequencies recorded sequentially on the same track of the recording medium are different. 2 Check the reproduction level of the oscillation signal of Okinawa by the reproduction amplifier circuit, and
By sequentially recording and reproducing oscillation signals of different frequencies, if the oscillation signal of the first frequency is recorded and reproduced first, only the oscillation signal of the first frequency exceeds the specified reproduction level. , and Postscript 2 of recording and reproducing the oscillation signal
When recording and reproducing an oscillation signal with a frequency of
Recording is possible only if the second frequency oscillation signal recorded on the second frequency exceeds the specified playback level, and the first frequency oscillation signal recorded previously is below the specified playback level. An electronic still camera that includes a check circuit that outputs a signal.