JP3116966B2 - Electronic still video camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic still video camera having a function of preventing erroneous erasure, in which a still video is recorded one frame at a time on a recording medium such as a floppy disk (FD) or an IC card.

[0002]

2. Description of the Related Art An electronic still video camera capable of recording and reproducing a still video signal frame by frame on a recording medium such as a floppy disk (FD) or an IC card is known.

This electronic still video camera is, for example, a 2
Using an inch floppy disk as a recording medium,
This is loaded into the camera body and a still image signal (still video signal) for one field or one frame
Is recorded for one track in synchronization with a release switch provided in the camera body.
At the time of reproduction, by specifying a recording track (corresponding to a frame number), the still video signal recorded on that track is reproduced. The reproduced still video can be immediately reproduced by, for example, a television receiver.

[0004]

In an electronic still video camera capable of recording and reproducing data in this manner, there are cases where it is desired to delete unnecessary recording tracks. In that case, the recording track to be erased is selected, and then the erase switch provided on the camera body may be operated.

[0005] However, if the data recorded on the track can be erased by operating the erase switch alone, the track can be easily erased even when the track is selected by mistake. That is, there is no function of preventing erroneous erasure.

In view of the above, the present invention has been made to solve such a conventional problem, and proposes an electronic still video camera having a function of preventing erroneous erasure.

[0007]

In order to solve the above-mentioned problems, according to the present invention, the still video data recorded on the recording medium is recorded only when both the erase switch and the release switch are simultaneously operated. It is characterized by being made erasable.

[0008]

Function As shown in FIG. 2, the release switch LSW
When operated alone, a release process is executed (steps 51, 52, 53, 54). In this example, a single erase switch (single erase switch) SES used for erasing tracks one by one is operated simultaneously with a release switch LSW and an erase switch, and a single erase process is executed (step S1). 5
1, 55, 56).

Release switch LSW and erase switch In this embodiment, an all erase switch (all erase switch) AES used when erasing all tracks.
Are operated at the same time, an all-erase erasing process is executed (steps 51, 52, 57, 58).

[0010] Even if only the erase switch (SES or AES) is operated in this way, the operation does not immediately proceed to the erase process, but the erase switch (SES or AE) is operated.
Only when both S) and the release switch LSW are simultaneously operated, the erasing process is executed. For this reason, the erroneous erasure prevention function has been significantly enhanced compared to the related art.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where an example of an electronic still video camera according to the present invention is applied to an electronic still video camera having a recording / reproducing function will be described in detail with reference to the drawings.

FIG. 1 is a system diagram of a main part showing an example of an electronic still video camera 10 according to the present invention. A subject image (optical image) 11 is formed on an image sensor 15 such as a CCD via an optical system 12, a mirror 13, and a shutter 14, and this is converted into an electric signal (image signal).

The image pickup signal is converted into a television signal form in a signal processing circuit 16 and supplied to a magnetic head 20 via a changeover switch 18 and a head drive circuit 19, so that the recording medium is a 2 inch floppy disk in this example. It is recorded as a still image of one field or one frame on a designated track of the disk 21.

At the time of reproduction, the designated floppy disk 2
While the magnetic head 20 reproduces one track, the changeover switch 18 is switched as shown by the broken line, and the reproduced still video signal is output to the video output terminal 23 via the reproduction amplifier 22. Numeral 24 denotes an erasing circuit. At the time of erasing, the changeover switch 18 is switched to the switching state shown by the solid line, and the still video signal recorded on the designated single or all tracks is erased.

The mirror 13 arranged in the optical system is developed as shown by the broken line only when the image is picked up so that the subject image is formed on the CCD 15, and the rest is in the state shown by the solid line.
Therefore, the subject image 11 reflected by the mirror 13 is reflected by the upper mirror 31 and guided to the optical viewfinder OVF. Reference numeral 32 denotes a lens system that constitutes the optical viewfinder OVF.

The light reflected by the half mirror 33 disposed on the optical path between the mirrors 13 and 31
The output controls the electric aperture and shutter aperture ratio. Therefore, this photometric output is supplied to the drive control circuit 36 of the shutter 14 and the mirror 13 in addition to the CCD drive circuit 35.

Reference numeral 40 denotes a control circuit (microcomputer) provided for controlling the entire system of the electronic still video camera 10, and from now on, a recording amplifier 17, a reproducing amplifier 22, an erasing circuit 24, a changeover switch 1
8. Appropriate mode control signals are supplied to the CCD drive circuit 35 and the drive control circuit 36, respectively. In addition, it is also supplied to a control circuit 41 so that the head drive circuit 19 is controlled based on the output and the disk drive circuit 42 is controlled.

According to the present invention, in addition to the above configuration, the following configuration is further added. That is, in the present invention, a release switch LSW, a shift dial switch TSW for designating a recording track or a reproduction track,
In addition, an erase switch is provided. The erase switch is provided with a single erase switch SES for erasing one track and an all erase switch AES for erasing all tracks, all of which are input to the mode control circuit 40. I have.

PSW is a reproduction switch, which is controlled so as to enter the reproduction mode only when operated. Therefore, the regeneration switch PSW is also associated with the mode control circuit 40. Reference numeral 45 denotes an erasure indicator (such as an LED) that lights only when erasing.

FIG. 2 shows the structure of the electronic still video camera 10. Reference numeral 60 denotes a camera body, 61 denotes a lens barrel, and an optical viewfinder OV is provided on the camera body 60 side.
F is attached, and a release switch LSW is provided on the right hand grip side of the camera body 60. 6
Reference numeral 2 denotes a display unit constituted by an LCD or the like, on which the number of used sheets (the number of used tracks), a shutter speed, and the like are displayed. In this example, a shift dial switch TSW is arranged near the display unit 62.

FIG. 3 is a rear view of FIG. 2, wherein 65 is an opening / closing lid for storing the floppy disk 21, and 66 is an opening / closing lid for an erase switch. When the cover 66 is opened, a single erase switch S
In addition to the EW, an all-erase switch AES, a reproduction switch PSW, and the like are provided, and an indicator light 45 for displaying the operation state of the switch is provided in proximity to the switch. Therefore, when the indicator light 45 is on, it can be visually recognized that the switches are correctly operated.

Now, an example of the erasing operation of the electronic still video camera 10 thus configured will be described in detail with reference to FIG.

As shown in FIG. 1, since the camera body 60 is provided with a plurality of switches including the release switch LSW, when the program shown in FIG. 4 is started, the operation state of the switches is recognized. .

First, in this embodiment, the operating states of the single erase switch SES, the all erase switch AES, and the release switch LSW are checked (steps 51, 52, 53). Release processing is performed (step 54), and a still video image is captured.

Next, when the single erase switch SES and the release switch LSW are simultaneously operated, the single erase process is executed (step 51, step 51).
55, 56). Therefore, even if the single erase switch SES is operated alone, the erase process is not performed.
Thereby, an erroneous erasure prevention function operates.

Similarly, the all-erase processing is performed only when the all-erase switch AES and the release switch LSW are simultaneously operated (steps 52, 57, 52).
58). In this case, the erase mode is not set even if only the all-erase switch AES is operated, so that the erroneous erasure is prevented.

In the case of single erase processing,
It is necessary to previously select a track to be erased using the shift dial switch TSW. In this case, for example, the track selection processing may be performed while setting the reproduction mode and watching the reproduced still video image. When an electronic viewfinder is used as the viewfinder, the reproduced image can be confirmed by the viewfinder, so that the erasing process becomes very simple.

[0028]

As described above, according to the electronic still video camera of the present invention, the still video signal is erased only when the erase switch and the release switch are simultaneously operated. It is.

According to this, in addition to the feature that erroneous erasure processing can be reliably avoided, in this embodiment, the release switch is also used as a switch for preventing erroneous erasure, so that the switch can be effectively used. .

[Brief description of the drawings]

FIG. 1 is a system diagram showing an example of an electronic still video camera according to the present invention.

FIG. 2 is a plan view showing an outline of an electronic still video camera.

FIG. 3 is a rear view of the electronic still video camera.

FIG. 4 is a flowchart illustrating an example of an erasing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Electronic still video camera 15 CCD which is an image sensor 17 Recording amplifier 20 Magnetic head 21 Floppy disk 22 Reproduction amplifier 40 Mode control circuit LSW Release switch SES Single erase switch AES All erase switch PSW Reproduction switch TSW Shift dial switch 45 Indicator light

Claims (1)

(57) [Claims] 1. An erasure prevention function characterized in that a still video signal recorded on a recording medium can be erased only when both an erase switch and a release switch are simultaneously operated. Electronic still video camera.