JPS5820080A - Electronic static picture recorder and reproducer - Google Patents

Abstract

PURPOSE:To obtain a small-sized electronic static picture recorder/reproducer which records and reproduces a static picture with high quality, by recording and reproducing the video output given from a photoelectric transducer through a magnetic recording medium in the form of an analog signal. CONSTITUTION:An picture formed to an image pickup element 13 through an optical lens 11 is stored at the element 13 in the form of the electric charge by setting an image pickup reproduction selector 14 at the pickup side, operating a switch 15 to drive a shutter 12 and giving a prescribed exposure time. This image information is recorded on a magnetic drum 17 synchronously with the frequency of a clock oscillator within a control circuit 16. When the image information is reproduced, the selector 14 is switched to the reproduction side. Then the switch 15 is pushed to turn the drum 17. Then the recorded image information is repetitively reproduced in the form of a static picture from a magnetic head 24 and via the circuit 16 and a recording/reproducing circuit 19 and with addition of a synchronizing signal for TV.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic still image recording and reproducing apparatus that captures still images using electronic means.

Electronic still image recording and reproducing devices (so-called electronic cameras) are inexpensive to use, can be played back immediately, can be reproduced on a television receiver, can be recorded using a VTR, etc.
It has features such as being easy to edit and save, and is seen as a promising replacement for optical cameras in the future.

However, conventional electronic still image recording and reproducing devices
Since it is inevitable that the scale of the equipment itself will increase, it is the national treasury's responsibility to realize it at an appropriate price (Japanese Patent Application Laid-Open No. 54-136).
No. 325).

As shown in the figure, an image formed by an optical lens 1 is captured by a photoelectric conversion element 3 such as a CCD via a color separator 2, and then converted into a digital signal by an AD converter 4. It is temporarily stored in an image memory 5 such as an IC memory.

This stored signal is recorded in the magnetic recording and sickle reproducing device 6, and recorded on a magnetic tape in the magnetic recording and sickle reproducing device 6. f
km is reproduced by converting the Eirin signal outputted from the magnetic recording sickle reproducing device 6 into a digital signal using the DRWII4@4.
After scanning, this is temporarily stored in the image sensor 5jC, and then - at a speed matching the scanning speed of the electronic optical display device 8.
The signal is again converted into an analog @image signal via the DM conversion II 7 and reproduced and displayed on the electronic optical display device 8 . Na8
1, reference numeral 9 indicates a printer for displaying an image as a bartcopy, and 1G indicates a control circuit as a means for carrying out the various controls described above.

Such a conventional electronic still image recording and reproducing device has: l) In addition to the recording medium (magnetic tape in this case), there is also a buffer memory, which is a digital image memory 5 for -ImWJ.
This not only increases the cost but also increases the size of the device, which becomes an obstacle to the demand for miniaturization.

2) Since the AD converter 4 and the 9-person converter 7 are required, the price cannot be avoided. 3) The AD converter 4 and the DA converter 7 are used to AD convert the signal.
Since conversion and 0 person conversion are performed, conversion errors are accumulated and 1
There was a drawback that image quality deteriorated.0 This invention eliminates the above-mentioned drawback, and
By adopting a configuration that records and reproduces the video output from the photoelectric conversion element as an analog signal on a magnetic recording medium without using a buffer memory, we have created an electronic still image recording and reproducing device that is small, low cost, and has good image quality. This is what we are trying to provide.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the basic configuration of this embodiment. A two-dimensional image sensor 13, such as a COD, is placed on the imaging plane of an object formed by an optical lens system including a lens 11 and a shutter 12, and an image signal corresponding to the optical system is obtained, imaged, and reproduced. Set the selector 14 to “Image” and take an image.
By operating the regeneration switch 15, the control circuit 16
By operating the shutter 12 via the camera, images are captured only for a required length of time. ξ is the same as in the case of conventional film-type cameras, and the speed of movement of the subject, m * - electron 1
The time of ξ is selected to be most suitable based on the sensitivity of 3.

The shutter 12 is actuated by operating the imaging/reproduction switch 15, and the magnetic drum drive circuit 1 for driving the magnetic recording medium 8, the magnetic drum 17 in this embodiment.
8 is activated, and image information, which is the output of the image pickup device 13, is recorded on the magnetic drum 17 via the edge reproducing circuit 19.

The degree of protrusion of image information from the image sensor 13 is independent of the shutter speed and depends on the image information retention time of the image sensor 13, the performance of the magnetic head of the magnetic recording system, the recording density of the magnetic drum 17, and the reproduction display. This is determined by considering the performance of the television receiver 20 or VTR for silver pictures.

In general, the shutter speed for recording a still image is:
As with normal optical cameras, camera shake will occur unless the camera moves at a high speed of several tenths of a second or more.

Furthermore, in order to photograph objects that move rapidly, a shutter opening time of about a few hundredths of a second is desired.

However, the image sensor 13 used is one that can retain image information once captured for a predetermined period of time, and in the case of a two-dimensional CCD, this retention time can be approximately a fraction of a second within a range where image deterioration is not a problem in practice. It is. Therefore, regardless of the shutter speed, the data may be read and recorded on the magnetic drum 17 within this retention limit.

Regarding the magnetic recording density, in the case of current VTRs, the relative speed between the magnetic head and the magnetic tape is about several meters per second, and the diameter of the magnetic tape needs to be about 2 cm for one screen (1 frame). Become.

A plurality of images can be recorded on the magnetic drum 17 by relatively shifting the relative positions of the magnetic drum 17 and the magnetic head each time an image is captured and recorded.

For playback, the control circuit □
The magnetic drum 1 is connected to the magnetic drum 1 via the magnetic drum drive circuit 18.
7 is rotated, and the image information on the magnetic drum 17 is read out by the magnetic head and reproduced repeatedly by the television receiver 20. Since this still image signal is reproduced in accordance with the scanning speed of the television receiver 20, it can be easily recorded or edited using a VTR.

FIG. 3 shows a configuration that further embodies the embodiment shown in FIG. 2. In FIG.

The image sensor 13 and the control circuit
A circuit board 21 to which an electronic circuit such as a sse sickle regeneration circuit 19 is mounted is provided. An imaging Q reproduction selector 14 and an imaging/reproduction switch 15 are provided on one side of this circuit board 21 and connected to a control circuit 16.

The magnetic drum 17 is driven by a motor 22 via a belt 23λ, and the motor 22 is controlled by the magnetic drum drive circuit 18 shown in FIG. 2
4 is a magnetic head, which is supported on the base body 26 by a leaf spring 21C in order to stabilize the contact state with the magnetic drum 17;
This base body 26 is screwed onto a feed screw 27 for frame-by-frame feeding, and its position is moved by rotating this screw 27. The output end of the image sensor 13 is led to a terminal 28 via a recording/reproducing circuit 19, and this terminal 28 is indicated by one symbol.

By setting the imaging/playback selector 14 to the shooting mode and operating the imaging/playback switch 15 to drive the shutter 12 and give the required exposure time, *
*Information is stored as electric charge.

The data are sequentially recorded on the magnetic drum 17 via the magnetic head 24 in synchronization with the clock frequency of the oscillator.

At this time, the magnetic drum 17 drives the motor 22 in conjunction with the imaging/reproduction switch 15 to slide the magnetic head 24 onto the magnetic drum 17.

Until the imaging by the image sensor 13 is completed, the magnetic drum 1
7 at a predetermined speed.

In addition, the image information accumulated in the image sensor 1j is sent to the magnetic head 2.
The frequency of the clock sent to the magnetic drum 17 via 4 is set to 2 to match the standard of the television receiver 20.

Although not shown in the figure, the position of the magnetic head 24 is adjusted at a predetermined interval by a mechanism equivalent to the film winding mechanism, as in the case of film winding in general optical cameras, until the next photograph is taken. Let's move it.

By repeating the above operations, a large number of still images can be easily recorded on the magnetic drum 17. According to current magnetic recording technology, more than 200 screens can be recorded on the magnetic drum 17.

For reproduction, the terminal 28 is connected to the television receiver 20 shown in FIG. 2, the magnetic head 24 is returned to the initial element position, and the imaging/reproduction selector 14 is switched to reproduction. Next, by pressing the imaging/reproducing switch 15, the magnetic drum 17 is rotated, and the image information recorded on the drum is transferred from the magnetic head 24 to the control circuit 16 and the recording/reproducing circuit 19, and then converted into 11-element information on the TV. A synchronization signal is added and sent to the television receiver 20. This allows the image information recorded on the magnetic drum 17 to be repeatedly reproduced by the television receiver 20. When the reproduction of the 11th screen is completed, the magnetic head 24 is advanced one frame and the next screen is reproduced.

A large number of still images can be reproduced by sequentially repeating the same operations. Of course, the magnetic head 24
You can also play back only the desired image in a short time by skipping the positions of the images. Wear.

This gIA Akira is characterized by the fact that it uses an image sensor with an information retention function like a COD, and records and reproduces the original signal as an analog signal on a magnetic recording medium, and the playback display is Television receivers that are widely used in general households can be used. Therefore, there is no need for an independent and significant effect as listed below and for a zero-person converter.

Therefore, it is possible to significantly reduce the price, and also to achieve miniaturization and power saving.

(2) Since still images can be viewed by directly connecting to a television receiver, one frame memory as a buffer for one display is not required. Therefore, from this aspect as well, it is possible to significantly reduce the price, downsize 8 and save power.

(3) Since MuD conversion # and Dmu conversion are not performed,
A high-quality image can be obtained without deterioration of image quality caused by these conversions.

(4) Since analog signals are recorded, the information density of the magnetic recording medium can be increased and it is economical.

(5) VT because it outputs a signal for a television receiver.
By recording in R, Ik% editing etc. can be performed.

Thus, the still image recording device of the present invention can make the image pickup unit as compact and lightweight as a general optical camera, reduce power consumption, and significantly improve portability. It has the advantage of being able to utilize a VTR.

Note that the invention of ξ is not limited to the above-mentioned embodiments, and can be implemented with various modifications without changing the gist.

In the above embodiment, the magnetic head is slid on the outer circumferential surface of the magnetic drum, but this may also be configured such that the magnetic head is slid on the inner circumferential surface of the magnetic drum.

In this case, the magnetic head side can be rotated by coupling signals using a rotary transformer or the like.

In this way, the structure can be further miniaturized.

In this case, a core feeding function is provided on the magnetic drum side.

Further, although the above embodiment uses a motor to drive the magnetic drum, this driving can also be done by other methods, such as by spring action means such as a spring.

Next, in the embodiment described above, the position of image information on the magnetic drum when writing it on the magnetic drum is determined depending on the presence or absence of the information, and recording is started from the part where no information is included. However, the recording and reproducing circuit can be simplified by creating a hole or notch in one layer of the magnetic drum that serves as an indicator, detecting this with a photoelectric sensor, etc., and aligning the writing start position. can be converted into

Further, positional information is recorded on the magnetic drum in advance, and a positional information detection head for this information is attached to the magnetic head. In this case, although the shape of the magnetic head becomes a little larger, it is possible to easily start writing image information onto the magnetic drum using only the magnetic head. Furthermore, by recording a clock mark for the CCD sensor in addition to the write start position information on the magnetic drum, a clock oscillator can be omitted, and image information can be written even when the rotation of the magnetic drum is unstable. There are benefits to doing so.

This is the CC according to the clock mark on the magnetic drum.
If the image information captured by the D@@ element is recorded point by point on the magnetic drum in a regular manner, this recording will be no different from that recorded when the magnetic drum is rotating at a predetermined speed. This is because the image will never be reproduced, and therefore this image can be reproduced. Therefore, even if the rotation of the magnetic drum does not reach the predetermined number of rotations by the time the image capturing on the COD aversive element is completed, #* information is recorded on the magnetic drum and the information is not used. This means that a small motor with minimum torque can be used. In addition,
In this case, during reproduction, it is sufficient to wait until the rotation of the magnetic drum reaches a predetermined speed.

Further, a modified embodiment based on this purpose using a small motor with low torque is shown in FIG. 4(1)(b). In FIG. 4(a), a delay circuit 31 such as a timer is inserted between the imaging/reproduction switch 15 and the control circuit 16, and in FIG. is provided, and the output of the rotation speed detection circuit 33 of the magnetic drum 17 is applied to one input terminal thereof.

In FIG. 4(a) 1C, after the imaging/playback switch 15 is turned on and the magnetic drum 11 begins to rotate, the control circuit 16 is started after a predetermined time has elapsed by the delay circuit 31; In this case, the control circuit 16 is started after the rotational speed inspection circuit 32 checks whether the magnetic drum 17 has reached a predetermined rotational speed. Note that in FIG. 4 (aHb), the same parts as in FIG. 2 are indicated by the same reference numerals, and explanations thereof are omitted.

The recording medium is not necessarily limited to this, and other recording media such as magnetic sheets can be used, and magnetic tape can also be used if some inconvenience is tolerated. Furthermore, although the case where a COD is used as the image pickup device has been mainly described, other devices may be used in place of this as long as they can hold mf&information for a predetermined period of time.

As described above, according to the present invention, by adopting a configuration in which the video output from the photoelectric conversion element is recorded as an analog signal on a magnetic recording medium and reproduced without using an AD, DA converter, or buffer memory, It is possible to provide an electronic static recording and reproducing device that is small and inexpensive and has good image quality.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of an example of a conventional electronic still image recording and reproducing device, FIG. 2 is a block diagram showing a schematic configuration of an embodiment of the present invention, and FIG. is a configuration diagram embodying the same example, Figure 184 (am)
(b) shows different embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Optical lens 2-- Color separator 3... Light/electron conversion element 4--Mu D converter 5-- Image memory 6... Magnetic recording/reproducing device 7--D converter
8...Electronic optical display device 9...Printer
10--Control circuit 11-Lens 12
・-Shutter 13...Photographing element 14-・Photographing 11 playback selector 15...Imaging/playback switch 16
--Control circuit 17--Magnetic drum 18--Magnetic drum drive circuit 19--Kikama reproducing circuit 2 G-
・TV receiver 21・-Circuit board W 22-・・・
Motor 23... Belt 24... Magnetic head 25... Leaf spring 26... Base 27...
Feed screw 28, one terminal 31-...delay circuit
32-...Rotation speed detection circuit Fig. 1 Fig. 2 Fig. 3 Fig. 4 (a)

Claims (1)

[Scope of Claims] (1) An optical lens system that fixes the image of a subject at a predetermined position, and an optical lens system that senses the optical image obtained by this lens system and captures a still image of one screen. An ms element having a function of retaining this information for a predetermined period of time, a magnetic recording medium on which analog recording is performed by the output of this image sensor, and a recording of the output and reproduction from this on the magnetic recording medium. 4 I
An electronic still image recording and reproducing device. (22) The electronic still image recording and reproducing apparatus according to claim 1, characterized in that a magnetic drum is used as the magnetic recording medium. An electronic still image recording and reproducing device according to claim 1, characterized in that: 14) A defective portion indicating an image recording start position is provided in the magnetic recording medium, and the image recording start position is detected by a sensor. 3. A static reproducing apparatus according to any one of claims 1 to 3. (5) Claims 1 to 3 are characterized in that data indicating an image recording start position is magnetically recorded on a magnetic recording medium by approximately 6ζ, and an auxiliary head for detecting this data is attached to the magnetic head. The electronic still image recording/reproducing device 0(6) according to any one of the above, characterized in that clock data for continuous output of signals of the V11 element is memorized and recorded on a magnetic recording medium, and a clock oscillator is omitted. An electronic stationary 11ii*le sickle reproducing device according to any one of claims 1 to 5. (7) The electronic static stop-me recording device according to claim fl1g, wherein the shutter function is operated after the rotational speed of the magnetic drum reaches a predetermined speed.