JPH0374077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an imaging device, and particularly to a device that converts a subject image into electrical information and records it on a medium or reproduces a signal recorded on a medium.

<Prior Art and Problems> Conventionally, it has been known, for example, in US Pat. No. 3,982,274, to form a television, particularly a color television, by using a so-called charge transfer device such as a CCD or a BBD as an image sensor. Furthermore, a still image is obtained by temporarily storing the image signal from the same element, then reading it out at a relatively low speed, converting it into a video signal, and recording it on a magnetic image recording medium such as a magnetic disk. The method and apparatus also include, for example
Disclosed in USP4057830.

However, such a device would be more convenient to use if it were provided with a playback function as a function other than recording.

<Object of the Invention> The present invention provides a new playback function in the above-mentioned imaging device, so that it is possible to play back not only captured and recorded images but also captured and recorded images. It is an object of the present invention to enable each function of imaging, recording and reproducing to be realized with a simple configuration and with ease of use by making it possible to use the same.

<Means for Solving the Problems> In order to achieve the above-mentioned objects, the present invention provides an imaging means for converting a target image into an image signal, a recording means for recording an image signal from the imaging means on a recording medium, and a recording means for recording the image signal on the recording medium. reproducing means for reproducing the recorded image signal;
an operation section for instructing the recording means to record the image signal; a switching means for switching between a recording mode for operating the recording means and a reproduction mode for operating the reproduction means; a recording mode of the switching means; control for causing the recording means to record the image signal in relation to the operation of the operation section when switching to the mode, and for changing the playback state of the playback means in relation to the operation of the operation section when switching to the playback mode; <Embodiment> The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing the configuration of an apparatus according to an embodiment of the present invention. Reference numeral 1 in the figure is an imaging optical system for forming an image of an object (not shown), and a solid-state imaging device 2 such as a CCD is disposed near the imaging surface of the optical system 1. A color filter 3 for detecting color information of an object is provided on the same element. Reference numeral 4 denotes a semi-transmissive mirror that is installed obliquely on the optical axis of the imaging optical system 1 and guides a portion of the object light onto a photoelectric conversion element 5 provided for detecting the amount of the object light. The working structure of the solid-state image sensor 2 and the color filter will be explained in detail with reference to FIG. 2. In the figure, the color filter 3 is placed apart from the solid-state image sensor 2 for ease of explanation; in reality, the color filter 3 is placed over the solid-state image sensor 2. be. The solid-state image sensor 2 in the figure is a so-called frame transfer type consisting of a light receiving section 2a and a storage section 2b, but in the present invention, it is not limited to the same type of element, but also an interline type and a line address type, for example. Is possible. 2c is a horizontal shift register for transferring the image signal stored in the storage section 2b to the output terminal 2e via the output diode 2d. The light-receiving section 2a is composed of many light-receiving elements made up of even smaller segments, and the image output from the solid-state image sensor having such a configuration is once transferred from the light-receiving section 2a to the storage section 2b while maintaining the arrangement relationship. Furthermore, since the image output signal is transferred one row at a time to the right in the figure by the horizontal shift register 2e, the output of each light receiving element is sequentially read out in a predetermined order. The color filter 3 is divided into section angles equal to the size of the individual light-receiving elements, and the section angle Y has spectral characteristics such that the transmission area can obtain the component Y that is the luminance signal in the standard television system. The selected color filter has a zone angle R and a zone angle B, and is a color filter selected to have spectral characteristics such that R (red) and B (blue) component signals of the above method can be obtained. In rows with odd number of squares, Y-R-Y-R
..., and in even-numbered rows, it is assumed that they are arranged as B-Y-B.... Therefore, for example, the light receiving elements a _1.1 , a _2.1 , a _{3.1 .} . . in the first row are respectively Y-R-Y...
The second row of light receiving elements a _1.2 , a _2.2 ,
a _3.2 ... will each generate a B-Y-B... signal. Returning to FIG. 1, the output of the photoelectric conversion element 5 is converted by the photometric signal processing circuit 6 into a signal that allows setting the integration time of the solid-state image sensor from the photometric amount.
Furthermore, it is input to the integral time control circuit 7. The integration time control circuit 7 receives the above signal and generates a timing pulse for controlling an appropriate integration time of the solid-state image sensor determined in accordance with the amount of photometry, and inputs it to the synchronization signal generation circuit 8. In the synchronization signal generation circuit 8,
It not only generates the readout pulse of the timing pulse signal of the integral time of the solid-state image sensor 2, but also controls the timing of the entire apparatus based on a known reference clock frequency. Details of the method of controlling the integration time based on the output of the photoelectric conversion element 5 will be described in this example and other methods in separate drawings. Reference numeral 9 denotes an image signal processing circuit that receives an image signal read out from the solid-state image sensor 2 and converts it into an NTSC signal, and an example of the configuration of this circuit is shown in FIG.

In FIG. 3, numerals 2 and 8 are the solid-state image sensor and the synchronization signal generation circuit, respectively, and the arrow 8' in the figure shows how the control signal for the integration time is input to the synchronization signal generation circuit 8. There is. The signal read out from the solid-state image sensor 2 is output via the output terminal 2e, and vertical correlation processing is performed on the luminance signal Y in the signal. For this purpose, the signal corresponding to the section angle Y in the color filter is read out via the sample and hold circuit 11, and then sent to the low-pass filter. Vessel 1
5. The signal is input to a known vertical correlation processing circuit 18 consisting of adders 16 and 17, and a luminance signal _Y0 is output.
On the other hand, since the red component R and the blue component B are obtained every 1H, in order to continuously obtain a color video signal, a sample hold circuit 19 is provided to take out a signal corresponding to the section angle RB of the color filter.
The R and B components are taken out through the R and B components, and further inputted to a known synchronization circuit 22 via a low-pass filter 20 for removing unstable high frequency components and a delay circuit 21. In this circuit, an R signal is always output from one output terminal, and a B signal is always output from the other output terminal. The thus separated luminance component Y ₀ , red component R., and blue component B are all input to a known encoder 23, and the encoder 23 outputs a so-called NTSC signal. In FIG. 1, the NTSC signal that is the output of the image signal processing circuit 9 is transmitted to the video recording signal generation circuit 10.
The signal is input to the video signal, is converted into a video signal, is energized to the magnetic head 11, and is recorded on an image recording medium 12 such as a video disk. In this example, the image recording medium 12 is a video disk, but the video disk is rotated at a predetermined speed around a rotation axis (not shown) by a motor 14 whose rotation is controlled by a motor drive circuit 13. By this, an image is recorded on a specific track. On the video disk 12, for example, about 40 track areas are provided concentrically according to the displacement of the head 11 in the radial direction of the disk 12.
The image is recorded. In order to record another image, the magnetic head 11 must be moved in the radial direction of the video disk, so a head access circuit 1 is required, which will be described in detail in the camera configuration described later.
A head access mechanism 16 is provided which is driven by 5. Reference numeral 17 denotes a video reproducing circuit for reading out an image signal once recorded on the image recording medium 12 via the magnetic head 11 and converting it back into an NTSC signal. Video recording signal generation circuit 10
The configuration of the video reproducing circuit 17 is already well known, and an example thereof is shown in FIG. Elements in FIG. 4 that are numbered the same as in FIG. 1 have the same configuration and function, and therefore their explanations will be omitted. 18,1 in the same figure
9, 20, and 21 are low-pass filters, respectively.
These are a pre-emphasis circuit, an FM modulator, and a high-pass filter, which process the luminance signal. 22 is a hand-pass filter that separates and extracts the 358MHz color sub-general transmission signal; the output of the filter is balanced-modulated by the frequency generated by the oscillator 25 and the frequency converter 23, and passed through the low-pass filter 24 to the color signal. Processed as a signal. The luminance signal and color signal processed as described above are mixed in a mixer 26, amplified in a recording amplifier 27, and supplied to the magnetic head 11 to record an image. On the other hand, during playback, the switch 28 is switched to the video playback circuit side,
The video signal read out by the magnetic head 11 is amplified by a reproducing amplifier 30, and is then amplified by a high-pass. Filter 31, limiter 32, FM demodulator 33,
It is converted into a reproduced luminance signal via a low-pass filter 34 and a de-emphasis circuit 35, while a color signal frequency band is extracted by a low-pass filter 36 and converted into a reproduced color subcarrier, and the oscillation frequency
Balanced modulation is performed by a 3.58 MHz oscillator 25 and a modulator 37, and the frequency is converted to the sum of these frequencies, and then passed through a band pass filter 38, a burst gate circuit 39, and
A continuous signal that is phase synchronized with the color burst signal is produced via the APC circuit 40. On the other hand, the output of the low-pass filter 36 is transmitted to the frequency converter 4
1, it is balanced modulated with the output signal of the above APC circuit,
Furthermore, a bandpass filter 42 extracts the difference frequency between these signals to obtain the original color subcarrier. A mixer 43 mixes the luminance signal and the color subcarrier to obtain a reproduced NTSC signal. Returning to FIG. 1, 44 is a monitor signal generation circuit that receives the NTSC signal during recording and reproduction as explained in FIGS. 3 and 4, and generates a signal for forming a visible image on the monitor 45. It is. 28, 29 are
This is an interlocking switch that enables monitoring during both recording and playback.The state shown in FIG.
The NTSC signal is input to the monitor signal generation circuit 44 so that it can be monitored, and recording on the image recording medium 12 is simultaneously performed. When playing,
The switch is switched and the video playback circuit 17
The output NTSC signal of the magnetic head 1 can be input to the monitor signal generation circuit 44, and the magnetic head 1
The output of 1 is input to the video reproducing circuit 17, and the reproduced image can be monitored. 5 and 6 are diagrams respectively showing details of a monitor and a monitor signal generation circuit according to the present invention. In this example, a liquid crystal (hereinafter abbreviated as LC) matrix display device and a signal for driving the device are shown. An example of a generating circuit is shown below, but the monitor is not limited to this example, and can be a normal CRT display. Needless to say, it is possible to use a display such as an EL display or a plasma display. In FIG. 5, a is a partially cutaway view showing the structure of the LC matrix, and b is a sectional view of the same matrix. In the same figure a, 46 is a polarizing plate A, 47 is a glass substrate A, 48 is a liquid crystal seal, 49 is a vertical electrode, 50 is a horizontal electrode, 51 is a glass substrate B, and 52 is a polarizing plate B, and these are the above-mentioned. The liquid crystal is stacked in the order of vertical electrode 4.
9 and the horizontal electrode 50, as shown in b53 of the figure. In the above configuration, if external light is incident from the polarizing plate A46 side, the light passing through the polarizing plate A becomes linearly polarized light and enters the liquid crystal 53. On the other hand, on the inner surfaces of the two glass substrates A47 and B51 that sandwich the liquid crystal, alignment films (not shown) for aligning liquid crystal molecules in one direction are attached to the A and B substrates at an angle of 90 degrees from each other.
For this purpose, the encapsulated liquid crystal molecules are twisted 90 degrees between the two substrates. The linearly polarized light that has passed through the polarizing plate A has its polarization axis rotated by 90 degrees according to the alignment of the liquid crystal molecules, and reaches the polarizing plate B.
Therefore, if the polarization axis of polarizing plate B is made to match that of polarizing plate A, light will not travel downward from polarizing plate B. That is, the liquid crystal cell appears dark. Now, when a voltage is applied between specific electrodes of the transparent vertical electrode 49 and the transparent horizontal electrode 50, the liquid crystal molecules change their orientation perpendicularly to both electrodes due to the well-known electric field effect. As a result, the rotation of the polarization axis within the liquid crystal cell is eliminated, and the linearly polarized light from polarizing plate A becomes
Since the light can pass through the polarizing plate B as it is, the liquid crystal cell appears bright. As described above, depending on the presence or absence of a voltage applied between the electrodes, it is possible to form a light passage state, that is, a pattern of brightness and darkness, by selecting the electrode to which a voltage is applied in accordance with a signal. As a result, the image signal can be displayed as a visible image by converting the NTSC signal into a signal for applying voltage to the vertical and horizontal electrodes of the LC matrix display 45 using the monitor signal generation circuit 44. It is something. Next, referring to FIG. 6, a detailed configuration of the monitor signal generation circuit 44 will be explained. In the figure, 54 is a video amplifier;
It has the effect of amplifying the NTSC signal to the required level. The video signal and the synchronizing signal for scanning are separated by the amplifier and inputted to the serial/parallel converter circuit 55 and the control circuit 58, respectively.
The serial-to-parallel conversion circuit 55 converts the time-series video signal into a parallel output signal corresponding to one scanning line, synchronizes it with the horizontal synchronization signal of the control circuit 58, and outputs it via the horizontal electrode drive circuit 57 as shown in FIG. Voltages are simultaneously applied to the horizontal electrodes 50. The pulse width conversion circuit 56 functions to increase the pulse width in order to obtain a voltage application time long enough for the liquid crystal to function sufficiently. The vertical electrode scanning circuit 59 and the vertical electrode driving circuit 60 form a signal for vertical electrode scanning in response to a scanning command signal from the control circuit 58, and are used to apply a voltage to the vertical electrode 49 shown in FIG. Do it. FIG. 7 shows an example of an embodiment of a circuit in which the photoelectric conversion element 5, the photometric signal processing circuit 6, and the integration time control circuit 7 shown in FIG. 1 are integrated. In the figure, numeral 5 denotes the photoelectric conversion element described above, which is connected to the input terminal of the amplifier A, and its anode side is in contact with it. A capacitor C and a transistor _Tr1 are connected in parallel between the output terminal and the inverting input terminal of the amplifier. CP is a comparator, one input terminal of which is connected to the output terminal of the amplifier A, and the other input terminal of which divides the output voltage of the constant voltage circuit RQ by dividing resistors r ₁ and r ₂ . A constant reference voltage is supplied. V _DD indicates the power supply voltage. The operation of this circuit having various configurations is as follows. At the start of photometry, a pulse V _LR is given from the synchronization signal generation circuit 8 described in FIG.
Tr ₁ turns ON and the charge accumulated in capacitor C is discharged. Since the pulse V _LR terminates the connection in a short time, when Tr ₁ turns OFF, the capacitor C is charged at a speed determined by the time constant determined by the impedance corresponding to the brightness of the object of the photoelectric conversion element. is charged, and the output potential of amplifier A increases. When this output potential reaches the voltage value applied to the other input terminal of comparator C, comparator CP is inverted. The output of the comparator CP is converted into a timing pulse for integral time control of the solid-state image sensor 2 via the synchronizing signal generating circuit 8 shown in FIG. 1, and is used to set the integral time. On the other hand, a pulse V _LR having a slight delay after the inversion of the comparator CP is supplied to Tr ₁ to discharge the charge in the capacitor C again and return the output potential of the amplifier A to O. Since the pulse V _LR disappears in a short time, Tr ₁ turns OFF, and the capacitor C is charged again at a speed determined by the impedance corresponding to the brightness of the photoelectric conversion element 5, and the same process goes through again. Comparator C is inverted and the accumulation time is set. The integration time set in this way obviously changes depending on the brightness on the photoelectric conversion element, that is, the brightness of the object.
When the object is bright, the above impedance is low,
Since the capacitor C is quickly charged, the timing at which the comparator inverts becomes faster, and as a result, a shorter integration time is set. On the other hand, when the object is dark, the impedance is high and the capacitor C is slowly charged, so the timing at which the comparator inverts is delayed, resulting in a long integration time, and the solid-state image sensor 2 The image signal from the image sensor is kept at a proper level and is prevented from becoming saturated or becoming too small.
Note that the pulse V _LR always occurs only at the first moment when the electrophotographic device operates, and the pulse V LR
It is assumed that the synchronizing signal generating circuit 8 is configured to discharge the charges therein. Solid-state image sensor 2
The control of the integration time is not limited to the method described above; for example, the peak value in the output signal of the solid-state image sensor 2 is detected, and whether or not the peak value is within a predetermined level is determined using a window. If it is detected by a comparator and it is within a predetermined level, the integration time is determined to be set appropriately.If it is greater than the predetermined level, the integration time is shortened, and if it is less than the predetermined level, the integration time is lengthened. By repeating this control until the peak value falls within a predetermined level, an appropriate integration time can be obtained.

8, 9, and 10 are diagrams illustrating embodiments of an electrophotographic camera (hereinafter abbreviated as camera) incorporating the electrophotographic device according to the present invention as described above, and FIG. 9 is a front perspective view of the camera, FIG. 9 is a rear perspective view, and FIG. 10 is a diagram showing the internal structure of the camera. In FIG. 8, reference numeral 61 denotes a normal interchangeable lens, which is provided with adjustment parts such as a distance adjustment ring and an aperture necessary for normal photography.
62 is formed on the camera body 63 so as to be engageable with the rear end of the interchangeable lens 61. 4 is a semi-transparent mirror shown in the first diagram. Reference numeral 63a denotes a camera holding portion formed in a part of the main body, and is formed in a shape that is easy to hold by hand. 64 is a power switch for this camera. 64' is a release switch disposed coaxially with the rotation axis of the power switch. Reference numeral 65 denotes a head access device, which is composed of, for example, a liquid crystal analog display, and is used to arbitrarily specify an address of a portion of an image recording medium provided on an image recording medium to be reproduced and monitored for head access, which will be described in detail later. It is a command device, and when the button 66 is continuously pressed, the address of the recorded image is displayed sequentially from 1, for example, in a circuit described later. When the address of the desired recorded image is reached, the button 66 is pressed. When released, the head 11 accesses the image recording portion at that address, reproduces the image, and enables monitoring. Reference numeral 67 is a recording/reproduction switching button for simultaneously switching the switches 28 and 29 shown in the first figure. The functions of the head access command device 65 during playback, that is, when the recording/replay switching button is set to the PLB position shown in the figure, are as described above, but when the camera is in the image recording state, that is, When the recording/reproducing switch button 67 is set to the MTR position shown in the figure, the display becomes a surface corresponding to the address of the head, and functions as a number-of-sheets counter. Even if the button 66 is pressed at this time, the display is not affected in any way. 68 is mentioned in Figure 5.
This is an LC matrix display, and 73 is a shutter for protecting the display 68 from dirt and functional impact when it is not in use, and is shown in an open state in the figure. 69 is an optical viewfinder eyepiece, which is used to save power or for some other reason.
It can be used when it is difficult to use an LC matrix display, and the structure of the finder is well known.In the example shown in FIG. It can be arranged as a viewfinder structure of a normal single-lens reflex camera, and in this case, the photoelectric conversion element 5
As shown in FIG. 10, an auxiliary prism can be provided on one surface of an ordinary Benta-Dach prism. Reference numeral 70 designates an opening/closing lid of a cartridge chamber that accommodates a cartridge having the image recording medium that can be opened and closed around a hinge 71 fixed to a part of the main body 63; 70a is a locking member of the lid; 70b;
is a viewing window for the cartridge chamber made of transparent plastic, for example, and is useful for confirming the presence or absence of a cartridge. Reference numeral 72 denotes a shoe of the strobe device, and is provided with an electric contact 72a for exchanging signals with the camera. Reference numeral 96 in Figure 8 is a notification means such as a buzzer to notify that the solid-state image sensor is in the state of image charge integration.This makes it possible to warn the photographer of camera shake, etc., which is extremely useful for camera operation. It's convenient.
FIG. 10 is a cross-sectional view of the above-mentioned camera, in which a cartridge holding spring 74 is provided in the cartridge chamber 76, and in the closed state, the spring 74 acts to restrict the cartridge 75 to the normal position. The cartridge 75 contains an image recording medium 12 such as the video disk described above, which is in contact with the magnetic head 11 in the illustrated state. 7
7 is a cartridge positioning pin fixed to a part of the main body, and a small hole 7 provided in the cartridge.
8. A motor 14 rotates the image recording medium 12, and in this example, it is shown as a flat motor due to the structure of the camera. A small diameter pulley 80 is fixed to the shaft 79 of the motor. 83 is a rotating shaft rotatably supported by a bearing 82, and a large diameter pulley 8 is attached to the rotating shaft.
2 is permanently installed. Furthermore, 85 is a rotary table that is formed integrally with the shaft 83 and has a pin 86 that engages with a rotation hole 12a provided in the image recording medium 12. With such a structure, when the motor 14 is supplied with power controlled by the motor drive circuit 13 and rotates at a predetermined speed,
The rotary table 85 and hence the pin 86 rotate via the pulley 80, belt 81, and pulley 82, and the image recording medium 12 rotates at a constant speed, so that the magnetic head 11 records or reproduces an image. 8
Reference numerals 7, 88, and 89 are examples of the head access mechanism 16, and show the structure of a sliding member 89 having a rack 81a that meshes with a small gear 88 fixed to the shaft of a motor 87. Since the sliding member 89 is constructed integrally with the head 11, it is clear that the head moves over the image recording medium 12 by the forward and reverse rotation of the motor 87, and the motor is controlled by the head access circuit described later. Random access operation of the head is performed by rotating in response to a signal. Note that the motor 87 is preferably a pulse motor, which can be more easily controlled. Reference numeral 90 denotes a pentagonal roof prism constituting an optical finder. A small prism 92 is fixedly attached to a part of the prism, and the photoelectric conversion element 5 is disposed on the prism 92. It is assumed that the photoelectric conversion element 5 is optically arranged so that light passing through the pentagonal roof prism 90 and the small prism 92 reaches it. Reference numerals 2 and 68 denote the solid-state image pickup device and the LC matrix display device, which have already been described. 93 is a battery. FIG. 11 shows the head access circuit 15.
2 is a block diagram showing the configuration of the system. OS
Reference numeral 1 denotes a one-shot multivibrator which generates a single pulse in response to an output _I1 of a switch (not shown) configured to output a high level signal when the cartridge 75 is inserted into the camera 63. The output of OS1 is supplied as the input of OR gate OR1. The output terminal of OR1 is an AND gate
Supplied as one input of AND1. Same gate
The output of AND1 provides a reverse rotation signal B for the motor 87. Reference numerals 88, 89, and 11 are the aforementioned head access mechanisms including heads, and 94 is the same mechanism that advances in the direction of arrow B in the figure and is closed and grounded when it reaches the front of the first recording band of the image recording medium 12. It's a switch. To describe the operation of the circuit with the above configuration, the cartridge 75 is connected to the camera 63.
When inserted into , OR with the pulse generated from OS1
1 is turned ON. Since switch 94 is at high level and drive clock CP is applied to AND1, the gate output becomes high and motor 8
A reversal signal B of 7 is generated. MD is a known motor forward/reverse control circuit consisting of, for example, four transistors, and its detailed description will be omitted. When the above-mentioned signal B is input to MD, the motor 87 rotates in reverse and the head access mechanism moves in the direction of arrow B in synchronization with CP, and eventually the switch 94 is closed, so AND1 is closed and the signal B stops, and the motor 87 stops. On the other hand, the counter
Since a reset pulse is supplied to the reset terminal R of CO by OS1, the counter CO is reset.

Through the above process, preparation for image recording is completed. Reference numeral 95 denotes a switch that generates a signal corresponding to the recording and reproduction state in conjunction with the recording/reproduction changeover switch 67, and is connected to the MTR side in this state. OS2 has release button 6
This is a one-shot multivibrator that generates a pulse when 4' is pressed, and the output of OS2 is supplied as one input of OR gate OR2.
DD is a decoder driver that decodes the count value of the counter CO and generates a signal for driving the display device 65. With the above configuration, when the release button 64' is pressed, _I2 becomes high level, a pulse is generated from OS2, and the gate OR
2 opens, one pulse enters the counter CO,
At the same time as the counter becomes ``1'', the forward rotation signal F is input to the motor forward/reverse control circuit MD, the motor rotates by a predetermined amount, and the head 11 turns F.
direction, and the first recording will be made. Needless to say, the "1" state is displayed on the display 65 at this time. OS4 is a one-shot multivibrator that generates a pulse only at the moment when switch 95 is switched to the image recording state, and the output of OS4 is inverted by inverter V and input to AND gate AND4. Therefore, after the switch 95 is switched to MTR, the output of inverter V is at low level for a very short time and AND4 is closed, but after the above-mentioned time has passed, the output of inverter V is at high level. Therefore, from the above explanation, it is clear that release button 6
Every time 4' is pressed, it receives a pulse from OR2 and becomes open, and a pulse is input to the up-down counter U/DCO and held there. However, in the image recording state, U/DCO is in an up-count state via the flip-flop FF. As described above, if the release button 64' is pressed to record an image,
As the heads are sequentially accessed, the display 65
The number of recorded images is displayed. If you want to play back the image that was recorded midway, switch the recording/playback switch button 67 to the PLB side, and the switch 65 will turn on.
Connected to the PLB side. When this state is reached, the reset terminal R of the flip-flop FF becomes high level, U/DCO is switched to the downcant level, and OR gate OR1 is opened, and as mentioned above, the head reaches just before the first image recording band. be returned. On the other hand, OS3 is a one-shot match vibrator that generates a pulse when switch 95 is switched to the PLB side.
The output of OS3 becomes the reset input for counter CO and puts CO into the reset state. At the same time, display 6
5 is also reset. _I3 is an input terminal that becomes high level when the button 66 is pressed. Same button 6
While holding down 6, the AND gate AND2 is
The clock opens in synchronization with the clock CP, and at the same time the AND gate AND3 opens and the OR2 also opens, so the counter CO counts the number of clocks generated while the button 66 continues to be pressed, and the head access mechanism moves in the direction of the arrow F. As a result, when the desired image number is reached and the button 66 is released, the OR2 is closed at that position, the head stops on the corresponding image recording band, and the image is ready for playback. Regeneration is performed according to the operations already described. Even if the release 64' is pressed in the image reproduction state, the gate OR2 will be in the open state.
The image head is accessed. This makes it possible to realize a function equivalent to one-frame forwarding. On the other hand, in this state, AND4 is kept open and U/DCO
receives an access pulse in down count mode and holds a count obtained by subtracting the address of the reproduced image from the original number of recording strokes. Next, in order to record an image again, when switch 95 is switched to the MTR side again, AND6 is activated only while OS4 generates a pulse.
transmits a pulse to the U/DCO in synchronization with the clock CP, and the count held in that state is 0.
Drive U/DCO so that That is, a clock is generated from the AND gate AND5 until it closes in response to a borrow signal from the U/DCO, and accordingly, the head access mechanism is accessed in the F direction and the counter advances the count. At this time, the number of pulses generated from AND5 is
U/DCO with switch 95 switched to MTR
Since it matches the count held in
When this process is completed, the contents of the counter CO and the position of the head 11 will correspond to the number of strokes that have already been recorded, and when recording an image next time, a new one will be created through the same process as above. The counter CO and head access mechanism are controlled according to the number of strokes to be recorded. When image recording is performed in this manner and the counter CO reaches a full state, that is, a state in which no more images can be recorded on the image recording medium 12, a carry C is generated from the counter CO, which is latched by the latch circuit L, and the same signal is generated. The latch signal opens the gate OR1, resets the head access mechanism to the initial position, and connects the resistor r ₃ , transistor Tr ₂ ,
By providing a warning circuit consisting of
It is also possible to inform the user that all images have been recorded on the image recording medium 12. In the same figure
r ₄ , r ₅ , and r ₆ are resistors for receiving the power supply voltage V ₀ and ensuring a high level state or a low level state in the circuit. It should be noted that if it is determined that an image is no longer needed when playing back and monitoring the image, it is quite possible to erase the image so that it can be re-recorded using known methods such as installing an erasing head. . As described above, the electrophotographic device of this embodiment provides new functions such as electronic monitoring of images to be recorded and instant playback of recorded images that cannot be obtained with conventional cameras, in a compact camera form. Not only is it possible, but unlike general VTR systems, which tend to be large,
In terms of operability, it also has the advantage that it feels less strange than a normal camera.

In the embodiment described above, the imaging means for converting a target image into an image signal is composed of an optical system 1, a color filter 3, and a solid-state image sensor 2.

Further, in this embodiment, a recording means for recording an image signal from the image pickup means on a recording medium is shown in FIG. 410. Further, in this embodiment, a reproducing means for reproducing image signals recorded on the recording medium is composed of a head 11 and a video reproducing circuit 17.

Further, in this embodiment, the operation section for instructing the recording means to record the image signal is shown in FIGS. 8 and 9.
The release switch 64' shown in the figure is used.

In this embodiment, a switch 67 shown in FIG. 9 is used as a switching means for switching between a recording mode for operating the recording means and a reproduction mode for operating the reproducing means.

Further, in this embodiment, when switching the switching means to the recording mode, the image signal is recorded by the recording means in connection with the operation of the operation section, and when switching to the playback mode, the image signal is caused to be recorded by the operation of the operation section. Relatedly, control means for changing the reproduction state of the reproduction means are AND2, AND3, OR2, and the like shown in FIG.
It consisted of OS2, motor 87, etc.

<Effects of the Invention> According to the present invention, since it has a playback function in addition to the function of capturing and recording, not only can captured and recorded images be played back at home, but also when switching to playback mode, the recording means Since the image reproduced by the reproduction means is changed in connection with the operation of the operation section for instructing recording of the image signal, the operation section for recording can also be used for reproduction, This allows both recording and reproducing functions to be realized with a simple configuration and ease of use.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of the electrophotographic apparatus of the present invention, FIG. 2 is a configuration diagram of the solid-state image sensor and color filter of FIG. 1, and FIG. 3 is an implementation of the image signal processing circuit of FIG. 1. 4 is a circuit diagram showing an embodiment of the video playback circuit and video recording signal generation circuit of FIG. 1; FIGS. 5a and 5b are block diagrams showing the structure of the monitor; FIG. 7 is a block diagram showing one embodiment of the monitor signal generation circuit, and FIG.
A circuit diagram showing one embodiment of the photoelectric conversion element 5, the photometric signal processing circuit 6, and the integration time control circuit 7 shown in FIG.
The figure is a front perspective view of the external appearance of an electrophotographic camera incorporating an electrophotographic device according to the present invention, FIG. 9 is a rear perspective view of the camera of FIG. 8, and FIG. 10 is an internal configuration of the camera of FIG. FIG. 11 is a circuit diagram showing the structure of the head access circuit shown in FIG. 1.

Claims (1)

[Scope of Claims] 1. Imaging means for converting a target image into an image signal; Recording means for recording the image signal from the imaging means on a recording medium; Reproducing means for reproducing the image signal recorded on the recording medium; an operation section for instructing the recording means to record the image signal; a switching means for switching between a recording mode for operating the recording means and a reproduction mode for operating the reproduction means; a switch to the recording mode of the switching means; When switching to the operation section, the image signal is recorded by the recording means in connection with the operation of the operation section, and when switching to the reproduction mode, the image reproduced by the reproduction means is changed in connection with the operation of the operation section. An imaging device comprising a control means.