JPH0337191Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention transmits video signals, such as still image information, to a plurality of magnetic sheets that are rotated by a sheet rotation drive device installed inside the camera body. The present invention relates to a still image recording camera that performs magnetic recording to form an annular recording track.

[Conventional technology]

The applicant first recorded and/or reproduced video signals such as required still image signal information on the magnetic sheet while intermittently moving the magnetic head in the radial direction of the magnetic sheet rotating at high speed. We are proposing a still image recording camera.

The still image recording camera has a magnetic head brought into contact with a signal recording surface of a magnetic sheet in advance, and then a drive motor of a sheet rotation drive device is driven to rotate the magnetic sheet.
Video signals such as still image information are magnetically recorded so that required recording tracks are formed on the signal recording surface.

[The problem that the idea aims to solve]

As for the still image recording camera mentioned above,
In order to record video signals for one field constituting one still image on a recording track of a predetermined length, recording of video signals such as still image information onto a magnetic sheet is performed while the magnetic sheet is rotated at a predetermined number of revolutions. It is necessary to do this while the rotation is being operated. In this video signal recording state, if the magnetic sheet is not rotated at a constant rotational speed and the video signal recording operation is performed while the rotational speed is disturbed, the magnetic sheet will not be rotated at a constant rotational speed. When the recorded video signal is reproduced, the magnetic head cannot accurately scan the recording track, and the video signal is reproduced with good reproduction characteristics. I end up not being able to do anything.

By the way, a drive motor used in a seat rotation drive device or the like requires several seconds, for example, about 2 to 3 seconds, from the time of startup to the start of driving at a constant rotation speed. Therefore, if the release operation member that is operated to record the video signal on the magnetic sheet is pressed, the magnetic sheet and the magnetic head will immediately come into relative sliding contact and the video signal will be recorded. Disturbances will occur in the track. As a result, it becomes impossible to record video signals with good recording and reproducing characteristics.

Therefore, the present invention aims to maintain a constant rotational speed at which no disturbance occurs in the rotational speed of the magnetic sheet after the magnetic sheet is rotated and the magnetic sheet and the magnetic head are brought into relative sliding contact. By recording the video signal after the rotational operation is performed, and by quickly separating the magnetic sheet and the magnetic head after recording the video signal for one field or one frame on the magnetic sheet. , was proposed for the purpose of providing a still image recording camera that can maintain good recording and reproducing characteristics.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a release operating member having a first position where rotational drive of a magnetic sheet is started in accordance with a release pressing operation and a second position where a subject image is captured;
A video signal processing circuit and a magnetic head for sequentially recording one field or one frame of video symbols on the magnetic sheet so as to record a circular track, and an electromagnet that acts to bring the magnetic head and the magnetic sheet into contact with each other. and an electromagnet that acts to separate the magnetic head and the magnetic sheet from each other, the magnetic sheet is rotationally driven in conjunction with the first position of the release operating member, and the magnetic sheet is rotated in conjunction with the second position. The magnetic head is brought into contact with the magnetic sheet, and a video signal is recorded on the magnetic sheet.

[Effect]

In the present invention, when the release operation member is operated,
The head adsorption mechanism is operated to bring the magnetic head into contact with the magnetic sheet, and the magnetic sheet is rotated, and then the rotational speed of the magnetic sheet decreases due to the contact between the magnetic head and the magnetic sheet. After this is resolved, the video signal is recorded on the magnetic sheet.

Further, by driving the electromagnet that acts to separate the magnetic head and the magnetic sheet from each other, the magnetic head and the magnetic sheet can be immediately separated from each other.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view schematically showing a so-called electronic camera, which is a still image recording camera according to the present invention, and FIG. 2 shows the main parts of the electronic camera and a magnetic sheet jacket attached to the camera. FIG.

As shown in FIG. 1, the camera housing 1 of the electronic camera according to the present invention includes a lens system 2, an iris mechanism 3, a release operation member 4a, and a release operation member 4a, as in a normal photosensitive film camera. a shutter control circuit 4 driven by the member 4a;
A shutter section 5, mirror sections 6 and 7, a viewfinder 8, etc., which are driven to open and close by the shutter control circuit 4, are provided. Further, as parts specific to an electronic camera, a light sensor section 9 of a solid-state image pickup device (CCD or the like), a signal recording circuit 10, a magnetic recording device main body 11, etc. are provided.

As shown in FIG. 2, the magnetic recording device main body 11 incorporated into the camera housing 1 is provided on a mounting board 12, and a magnetic sheet jacket 13 is inserted into and removed from the mounting board 12. A jacket holder 14 is attached to the jacket holder 14 by a hinge shaft 15a so as to be openable and closable. Jacket housing 1 constituting the outer housing portion of the magnetic sheet jacket 13
A disc-shaped magnetic sheet 16 is rotatably housed in the magnet 5, and on this sheet 16, video signals for one field or one frame, such as still image information, form a plurality of annular tracks. It is now being recorded magnetically. A window 17 is formed in a part of the jacket housing 15 so that a part of the magnetic sheet 16 is exposed to the outside. Inside this window part 17, 1
One or more (one in this embodiment) magnetic heads 18 are inserted, and a plurality of video signals are magnetically recorded on the magnetic sheet 16 by the magnetic heads 18. This magnetic head 18 is connected to the window portion 1
7 and moves in the radial direction of the magnetic sheet 16 (in this embodiment, from the inner circumferential direction to the outer circumferential direction) every rotation of the magnetic sheet 16, and a plurality of video signals are arranged annularly on the magnetic sheet 16. magnetically recorded.

Further, a magnetic sheet 1 is placed on the mounting board 12.
A sheet rotary table 20 on which a reinforcing member 19 provided at the center of rotation of the magnetic sheet 6 is placed, and a magnetic sheet 16 in a magnetic sheet jacket 13 for recording and/or reproducing still image information, for example. The magnetic head 18, a guide plate 22 for stabilizing the contact state of the magnetic head 18 with the magnetic sheet 16, and a guide plate 22 for automatically and intermittently feeding the magnetic head 18 in the radial direction of the magnetic sheet 16. A head movement operation section 23, a drive motor 24 for rotationally driving the seat rotating shaft 20, etc. are provided.

The magnetic head 18 has a head movement operation section 23.
The magnetic head 18 is attached to the middle part of the moving arm 25 that constitutes the magnetic sheet 16.
The head protrusion window 26 formed at 2 is viewed from below. A pair of height regulating pins 27, 27 are installed on the guide plate 22. These pins 27, 27 are provided so as to provide a predetermined distance between the guide plate 22 and a regulating plate 29, which will be described later, provided on the side of the case cover 28 facing thereto.

Note that a spring 30 is attached to the moving arm 25.
One end 30a is locked, and this movable arm 25 is always moved in the direction of arrow A in FIG.
being pulled in the direction.

A fixed shaft 33 that is inserted into the insertion hole 32 on the side of the magnetic sheet jacket 13 is arranged approximately at the center of the mounting board 12. As shown in the figure, the seat rotating shaft base 20 is rotatably attached. A belt 35a is stretched between the rotary table 20 and a belt pulley 35 attached to the drive shaft 24a of the drive motor 24. Note that, as shown in FIG. 2, the tip end 33a of the fixed shaft 33 is inserted into the reinforcing member 19 attached to the center of the magnetic sheet 16 when the magnetic sheet jacket 13 is attached to the magnetic recording apparatus main body 11. It is designed to pass through the hole 32 and project upward from the magnetic sheet jacket 13, but this tip 33a comes into contact with the spacing adjustment screw 36 screwed onto the tip of the regulating plate 29. It's starting to match.

Further, the guide plate 22 is inserted into the window 17 of the magnetic sheet jacket 13, as shown in FIG.
The purpose of this guide plate 22 is to guide the rotation of 6 in a stable state.
As shown in FIG. 4, it is integrally formed with a plate-shaped horizontal portion 37 and a base end block 38 formed at its base end, and a magnetic sheet 16 is attached to the upper end surface of the horizontal portion 37 on its rotating surface. A sheet guide surface 37a for guiding the sheet so as to be substantially parallel to the sheet is formed in the shape of a flat surface. This sheet guide surface 37
A is for regulating the position of the sheet 16 from below in the vicinity of the head abutting portion where the magnetic head 18 abuts against the magnetic sheet 16 (see FIG. 3). Therefore, the sheet guide surface 3
The circumferential edge 37b of 7a is chamfered in an arc shape. Furthermore, guide surfaces 38d and 38e are formed on the lower surface of the base end block 38.
The magnetic head 18 is attached to the guide surfaces 38d and 38e.
The upper surfaces of the contact sliding portions 39a and 39b of the head slider 39 to which the head slider 39 is attached are configured to slide in opposition to each other. These guide surfaces 38d, 38
e is parallel to the sheet guide surface 37a. Further, the above-mentioned window portion 26 for protruding the magnetic head is formed through the central portion of the horizontal portion 37. This window portion 26 is connected to the magnetic sheet 16
For magnetic recording on the sheet 16, the magnetic head 18 is attached to the sheet of the guide plate 22 so that the magnetic head 18 can track the entire recording track between the innermost track and the outermost track of the sheet 16. It is opened to project onto the guide surface 37a.

Next, as described above, the head moving operation section 23 moves the magnetic head 18 intermittently in the radial direction of the magnetic sheet 16 while moving the magnetic head 18 over the magnetic sheet 16, for example from the innermost track to the outermost track. This is for tracking operation of the magnetic head 18 so that required information can be magnetically recorded sequentially over positions. In this illustrated example,
The main body is an L-shaped head moving arm 25 that is rotatably supported by a pivot 31 mounted on the mounting board 12. The magnetic head 18 is integrally attached as described above.

The head slider 39 and the head moving arm 2
5, the magnetic head 18 is connected to the magnetic sheet 16.
A pressing means 40 is arranged to abut against the. This pressing means 40 is driven in conjunction with the operation of the release operation member 4a, and in this embodiment, it includes a head slider 39 made of a magnetic material and a head slider 39 that guides the head slider 39 only in the vertical direction. Guide pins 41a, 41b
and between these guide pins 41a and 41b,
It also consists of an electromagnet 42 fixed on the head moving arm 25, and a leaf spring 43 interposed between the head slider 39 and the head moving arm 25 so as to cover the upper part of the electromagnet 42. .

One end of the head slider 39 has a through hole 44 into which a guide pin 41b is inserted, as shown in FIG.
The other end also has a notch 45 through which the guide pin 41a is inserted.

Further, each guide pin 41a, 41b is integrally planted on the head moving arm 25 at a predetermined interval. Further, the electromagnet 42 is composed of an iron core 42a fixed on the head moving arm 25 and a coil 42b wound around it. The current is supplied by the Further, the leaf spring 43 has a central portion protruding upward, and a through hole 43a and a notch 43b are formed at both ends thereof. Inside these through holes 43a and notches 43b,
Each guide pin 41b, 41a is inserted.
This leaf spring 43 is for elastically pushing up the head slider 39 upward from the bottom thereof to press the magnetic head 18 against the magnetic recording surface 16a of the magnetic sheet 16, and is always directed toward the side of the head slider 39. is elastically biased.

On the other hand, a regulating plate 29 is disposed on the case cover 28, and as shown in FIGS. 2 and 3, this regulating plate 28 is used to regulate the position of the magnetic sheet 16 from the upper surface side. Rectangular sheet regulating section 2
9a, and a plate-shaped attachment portion 29b integrally formed on the upper surface of the restriction portion 29a, and is disposed at a position on the case cover 28 side facing the guide plate 22. Note that the regulation plate 29
As shown in the figure, the four
They are supported movably in their axial directions by book locking pins 46a.

A compression spring 47 is interposed between the case cover 28 and the regulating plate 29. Therefore, due to the elastic force of this compression spring 47,
The regulation plate 29 is always elastically biased in the direction of the guide plate 22 along each of the locking pins 46a. The distal end of the mounting portion 29b protrudes to a position ahead of the guide plate 22, and the above-mentioned interval adjustment screw 36 is screwed onto the distal end.

Furthermore, a flat sheet regulating surface 29c as shown in FIG. 3 is formed on the lower end surface of the sheet regulating portion 29a constituting the regulating plate 29. As shown in FIG. This regulating surface 29c is connected to the sheet guiding surface 37a of the aforementioned guide plate 22 and the magnetic recording surface 16a of the magnetic sheet 16.
The purpose is to regulate the position of the machine at a predetermined distance from both the top and bottom sides.

Next, a description will be given of a state in which desired still image information is recorded using the electronic camera according to the present invention having the above-described configuration.

First, in order to record still image information, the magnetic sheet jacket 13 is loaded in a predetermined position in the jacket holder 14, and the jacket holder 14 is pushed into the magnetic recording apparatus main body 11 side. When the jacket holder 14 loaded with the magnetic sheet jacket 13 is pushed into the magnetic recording apparatus main body 11, the magnetic sheet 16 in the jacket housing 15 passes through the center hole 48 formed in the center of the jacket 13. Reinforcement member 1 provided at the center of rotation
The fixed shaft 33 is inserted into the insertion hole 32 of 9. At the same time, the regulating portion 29a of the regulating plate 29 and the horizontal portion 37 of the guide plate 22 are inserted into the window 17 of the magnetic sheet jacket 13 with a predetermined distance therebetween, and are mutually inserted into the window 17 within the window 17. They will be facing each other. Therefore, the magnetic recording surface 16a of the magnetic sheet 16 and the sheet guide surface 37a of the guide plate 22 face each other. Note that at this time, the head slider 39 is descending due to the adsorption action of the electromagnet 42.
Therefore, the head tip of the magnetic head 18 is separated from the magnetic recording surface 16a.

Next, in the first stage, when the release operation member 4a reaches the first position where it is pressed halfway, the shutter control circuit 4 operates and the drive motor control circuit is driven, and the drive motor 24 is activated by the operation of this circuit. starts rotating. After a few seconds, the drive motor 24 reaches the specified rotational speed. The motor 24 is continuously rotated while the rotational speed of the drive motor 24 is maintained at a specified value.

Then, in the second stage, when the release operation member 4a is further pressed and reaches the second position, the pressing means 40 is driven in conjunction with the pressing operation to the second position. That is, the supply of current to the coil 42b constituting the electromagnet 42 is stopped, and the electromagnet 42 stops its attraction action. Therefore, the protrusion 43c formed at the center of the leaf spring 43 moves away from the electromagnet 42 and pushes up the head slider 39 by its spring force. Therefore, the head slider 39 is guided by the guide pins 41a, 41b, and the sliding portions 39a, 39b contact the guide surfaces 38d, 38e provided on the lower surface of the guide plate 22.
is pushed up until it makes contact. Each contact sliding portion 39a, 39b of the head slider 39 is connected to the guide plate 22.
When the head tip of the magnetic head 18 provided on the head slider 39 comes into contact with the guide surfaces 38d and 38e of the magnetic sheet 16,
a. Note that at this time, the head chip contacts the magnetic recording surface 16a, causing the magnetic sheet 16 to
The rotational speed of the magnetic head 18 is disturbed, but when this disturbance is resolved and the rotational speed reaches the specified value again, a predetermined control signal is immediately supplied from the signal recording circuit 10 to the magnetic head 18. Therefore, a required video signal is magnetically recorded by the magnetic head 18 so as to form an annular recording track on the magnetic recording surface 16a of the magnetic sheet 16. When magnetic recording is completed, current is supplied to the coil 42b of the electromagnet 42, thus
The attraction action of the electromagnet 42 is started. Therefore,
The head slider 39 is lowered by its adsorption action, and the head tip of the magnetic head 18 is separated from the magnetic recording surface 16c of the magnetic sheet 16. Therefore, the tape contact surface of the head chip and the magnetic recording surface 1
6c can be prevented from wearing.

Next, FIG. 5 shows another example of the pressing means applied to the electronic camera according to the present invention.

In the example shown in FIGS. 1 to 4 above, the leaf spring 43 is arranged at the lower position of the head slider 39,
The head slider 39 is pushed up by the spring force of the leaf spring 43, and the magnetic head 18 is pressed against the magnetic sheet 16. Coil springs 49a and 49b are arranged around the pins 41a and 41b, and the spring force of these coil springs 49a and 49b pushes up the head slider 39 and presses the magnetic head 18 against the magnetic sheet 16.

Also in the case of the pressing means 40a configured in this way, the same effects as the pressing means 40 of the above-mentioned example can be achieved.

In the examples shown in FIGS. 1 to 5, the head slider 39 is made of a magnetic material, but only the portion of the head slider 39 facing the electromagnet 42 is magnetic, as shown by the broken line X in FIG. Alternatively, the other head slider 39 may be formed of hard synthetic resin or the like.

Further, as another example of the configuration of the pressing means 40, a self-holding plunger may be mounted on the head moving arm 25, and this plunger may be configured to be driven in conjunction with the operation of the release operating member 4a.

Furthermore, in the above example, during normal times,
The magnetic head 18 is kept separated from the magnetic sheet 16 by attracting the electromagnet 42, and the magnetic head 18 is moved away from the magnetic sheet 16 by using the urging force of the urging member such as the leaf spring 43 only when the release operation member 4a is pressed. 18 is configured to abut against the magnetic sheet 16.

However, it is possible to use electromagnets for all of the contact and separation operations of the magnetic head 18 with respect to the magnetic sheet 16.

That is, contrary to the above-mentioned examples, instead of the urging member such as the leaf spring 43, as shown in FIG. 142b as the guide plate 22
They are placed on both sides of the horizontal lower surface of the screen.
When the release operation member 4a is operated to record one field or one frame worth of video signals on the magnetic sheet 16, the electromagnets 142a and 142b are operated to draw the head slider 39 upward and move the magnetic head 18. Press it against the magnetic sheet 16.

Further, when recording of a predetermined video signal is completed, the electromagnet 42 is caused to perform a suction operation similar to that in the above example, and the head slider 39 is pulled downward.
The magnetic head 18 is separated from the magnetic sheet 16.

[Effect of idea]

As described above, in the present invention, the release operating member is operated, the head adsorption mechanism is operated, the magnetic head is brought into contact with the magnetic sheet, and the magnetic sheet is rotationally driven. Since the video signal is recorded on the magnetic sheet after the rotation speed of the magnetic sheet due to contact with the magnetic sheet is resolved, the video signal is always kept at the rotation speed of the magnetic sheet. Since recording is performed only when the rotation operation is performed at a constant rotation speed where no disturbances occur, high-quality reproduced images can be obtained. In addition, after one field or one frame worth of video signals is recorded on the magnetic sheet, the magnetic sheet and the magnetic head are separated by the operation of the electromagnet, so the separation operation described above can be performed quickly and reliably. It is possible to guarantee excellent recording and reproducing characteristics.

[Brief explanation of the drawing]

FIG. 1 is a sectional view schematically showing a so-called electronic camera, which is a still image recording camera according to the present invention, and FIG. 2 shows the main parts of the electronic camera and a magnetic sheet jacket attached to the camera. FIG. 3 is an enlarged cross-sectional view of a main part showing the vicinity of the pressing means. FIG. 4 is an exploded perspective view showing the pressing means between the guide plate and the head moving arm. FIG. 5 is a sectional view of a main part showing another example of the pressing means. FIG. 6 is a sectional view showing a specific embodiment for bringing the magnetic sheet and the magnetic head into contact with each other. 4a... Release operation member, 11... Magnetic recording device main body, 13... Magnetic sheet jacket, 16
...Magnetic sheet, 18...Magnetic recording head, 24
... Drive motor, 39 ... Head slider, 4
0,40a...Pushing means, 42...Electromagnet,
43...Plate spring, 49a, 49b...Coil spring, 142a, 142b...Electromagnet.

Claims (1)

[Claims for Utility Model Registration] A release operating member having a first position for starting rotational drive of a magnetic sheet in response to a release pressing operation and a second position for capturing a subject image; A video signal processing circuit and a magnetic head that record video signals for one frame sequentially so as to record a circular track, an electromagnet that acts to bring the magnetic head and the magnetic sheet into contact with each other, and the magnetic head and the magnetic head. and an electromagnet that acts to separate the magnetic sheet from each other, the magnetic sheet is rotationally driven in conjunction with a first position of the release operating member, and the magnetic sheet is rotated in conjunction with a second position, and the magnetic head and the magnetic sheet are rotated in conjunction with a second position of the release operating member. A still image recording camera that records video signals on the magnetic sheet while making contact with the magnetic sheet.