JPH0444826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is directed to transmitting video signals, such as still image information, to a plurality of magnetic sheets that are rotated by a sheet rotation drive device provided within a camera body. The present invention relates to a still image recording camera that performs magnetic recording so that an annular recording track is formed.

[Conventional technology]

The applicant has previously developed a novel static image sensor that is capable of recording and/or reproducing required still image signals on a magnetic sheet while intermittently moving a magnetic head in the radial direction of a magnetic sheet that rotates at high speed. We are proposing an image recording camera.

The above-mentioned still image recording camera has a magnetic head brought into contact with the signal recording surface of the magnetic sheet before the magnetic sheet is rotated, and then the drive motor of the sheet rotation drive device is rotationally driven to rotate the magnetic sheet. A video signal such as a still image signal is magnetically recorded so that a required recording track is formed on the signal recording surface.

[Problem to be solved by the invention]

By the way, the magnetic head may come into contact with the magnetic sheet immediately after pressing the release operation member. For example, during the preparation time until the rotational speed of the drive shaft for rotationally driving the magnetic sheet reaches a predetermined speed, The magnetic head may be separated from the magnetic recording surface of the magnetic sheet.

If the drive motor that makes up the seat rotation drive device starts up extremely quickly,
Although it is not necessary to bring the magnetic head into contact with the magnetic sheet from the beginning of the magnetic sheet's rotation, in reality, when the drive motor starts up,
Since it takes several seconds (for example, about 2 to 3 seconds), the magnetic head is in unnecessary contact with the magnetic sheet during the time required for the rise.

Furthermore, after the drive motor has finished starting up, if the release operation member is pressed while the motor continues to rotate at a constant speed,
Although the required signal is immediately magnetically recorded on the magnetic sheet, in this case as well, the magnetic head is in unnecessary contact with the magnetic sheet while pressing the release operating member.

In this way, if the magnetic head continues to be in unnecessary contact with the magnetic sheet, the sheet-contacting surface of the magnetic head will be worn out faster, and the signal recording surface of the magnetic sheet will be worn out and damaged faster. Not.

Furthermore, if the magnetic sheet and the magnetic head are brought into contact and separated each time a video signal is recorded or reproduced, the rotational speed will be distorted in the initial state in which the magnetic head contacts the magnetic sheet, causing the video signal to be distorted. There is a risk that stable recording will not be possible.

Therefore, the present invention has been proposed with the aim of solving such problems, and it prevents the magnetic head from continuing to contact the magnetic sheet unnecessarily, and prevents the magnetic head from contacting the magnetic sheet. This is intended to prevent wear on the contact surface and prevent wear and damage on the signal recording surface of the magnetic sheet.

Furthermore, it is possible to record video signals while the magnetic sheet is constantly rotating at a constant rotational speed, thereby making it possible to record video signals with good recording and reproducing characteristics.

[Means to accomplish the task]

In order to achieve the above-mentioned object, the still image recording camera according to the present invention includes a drive motor controlled by a control circuit that rotationally drives a magnetic sheet;
A release operation member that controls the control circuit in response to a pressing operation to start the rotation of the drive motor, rotates the magnetic sheet, and captures a subject image; The camera is equipped with a video signal processing circuit and a magnetic head that sequentially record video signals so as to form an annular track, and a head adsorption mechanism that operates to bring the magnetic head and the magnetic sheet into contact with or apart from each other, and to perform the release operation. In conjunction with the pressing operation of the member, the control circuit is controlled to start the rotation of the drive motor to rotationally drive the magnetic sheet and bring the magnetic head and the magnetic sheet into contact, and the control circuit causes the drive motor to start rotating. After it is detected that the rotational speed of the magnetic sheet has reached a specified value, a control signal is output from the video signal processing circuit to the magnetic head, and the magnetic head records the video signal on the magnetic sheet. .

[Effect]

In the still image recording camera according to the present invention, the drive motor starts rotating by controlling the control circuit in conjunction with the pressing operation of the release operating member to rotate the magnetic sheet, and the magnetic head is moved to the magnetic sheet. Contact. After the magnetic head generates a magnetic sheet, the control circuit detects that the rotational speed of the drive motor that rotates the magnetic sheet has reached a specified value, and the magnetic head generates a video signal for the magnetic sheet. will be recorded.

〔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, mirrors 6, 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 fixed image pickup device (such as a CCD), 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, one field or one frame worth of video signals, such as still image information, forms 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 section 17,
One or more (one in this embodiment) magnetic head 18 is inserted, and a plurality of video signals are magnetically recorded on the magnetic sheet 16 by the magnetic head 18. The magnetic head 18 is inserted into the window 17 and moves in the radial direction of the magnetic sheet 16 (in this embodiment, from the inner circumferential side to the outer circumferential side) for each rotation of the magnetic sheet 16. A plurality of video signals are magnetically recorded in a ring on the top.

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 this 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 opposite thereto.

Note that the moving arm 25 is provided with a spring 3.
0 is locked at one end 30a, and this movable arm 25 is constantly pulled in the direction of arrow A in FIG. 2 about a pivot 31.

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 rotary table 20 is rotatably mounted.
This rotary table 20 and the drive shaft 24a of the drive motor 24
A belt 35a is stretched around a belt pulley 35 attached to. Note that the fixed shaft 3
As shown in FIG. 2, when the magnetic sheet jacket 13 is attached to the magnetic recording device main body 11, the tip 33a of the magnetic sheet 16 passes through the insertion hole 32 of the reinforcing member 19 attached to the center of the magnetic sheet 16. The magnetic sheet jacket 13 is designed to project upwardly, and this tip 33a is connected to the regulating plate 29.
It is adapted to abut and engage with a spacing adjustment screw 36 screwed onto the tip of the spacer.

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 guiding 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 the bottom side around the head abutting portion where the magnetic head 18 abuts against the magnetic sheet 16 (see FIG. 3). For this purpose, the sheet guide surface 3
The circumferential edge 37b of 7a is chamfered in an arc shape. Further, 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 formed by 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 all the recording tracks 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 above head slide 39 and 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
, an electromagnet 42 fixed on the head moving arm 25 between the guide pins 41a and 41b, and the head slider 39 and the head moving arm 2 so as to cover the upper part of the electromagnet 42.
5 and a plate spring 43 interposed between the spring 5 and the leaf spring 43.

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 therethrough.
This leaf spring 43 elastically pushes up the head slider 39 upward from the downward direction, and the magnetic head 1
8 to the magnetic recording surface 16a of the magnetic sheet 16.
It is elastically biased in the 9-side direction.

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
It is supported movably in the axial direction by locking pins 46a, . . . of the book.

Further, a compression spring 47 is interposed between the case cover 28 and the regulating plate 29.
Therefore, due to the elastic force of the compression spring 47, the regulating plate 29 is always held in place by each of the locking pins 46a, . . .
The guide plate 22 is elastically biased along the direction of the guide plate 22. 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 by 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 is pushed in, the jacket casing 15 passes through the center hole 48 formed in the center of the magnetic sheet jacket 13.
A fixed shaft 33 is inserted into an insertion hole 32 of a reinforcing member 19 provided at the center of rotation of the magnetic sheet 16. 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 portion 17 of the magnetic sheet jacket 13 with a predetermined distance therebetween, and are opposed to each other within the window portion 17. state.
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. At this time, the head slider 39 is lowered by the attraction action of the electromagnet 42, and therefore the head tip of the magnetic head 48 is separated from the magnetic recording surface 16a.

Next, in the first stage, when the release operating member 14a reaches the first position where it is pressed halfway, the shutter control circuit 4 is activated and the drive motor control circuit (not shown) is driven. The motor 24 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
However, when the drive motor control circuit detects that the rotation speed has been resolved and the rotation speed has reached the specified value again, the signal recording circuit 10 immediately sends a predetermined signal to the magnetic head 18. A control signal is provided. Therefore, the magnetic head 18 records the magnetic recording surface 16 of the magnetic sheet 16.
A required video signal is magnetically recorded so as to form an annular recording track on a. When magnetic recording is completed, current is supplied to the coil 42b of the electromagnet 42, and therefore the attraction action of the electromagnet 42 is started. Therefore, the head slider 39 is lowered by its adsorption action, and therefore the head tip of the magnetic head 18 is moved down onto the magnetic recording surface 16a of the magnetic sheet 16.
move away from Therefore, it is possible to prevent wear of the tape contacting surface of the head chip and the magnetic recording surface 16a.

Next, FIG. 5 shows another modification of the pressing means used in the present invention.

In the embodiment shown in FIGS. 1 to 4, a leaf spring 43 is disposed at a lower position of the head slider 39, and the spring force of the leaf spring 43 moves the head slider 3
9 and push up the magnetic head 18 onto the magnetic sheet 16.
However, in this embodiment, the lower position of the head slider 39 is
Further, coil springs 49a and 49b are arranged around each guide pin 41a and 41b, and the head slider 39 is pushed up by the spring force of each of these coil springs 49a and 49b, and the magnetic head 18 is pressed against the magnetic sheet 16. are doing.

Also in the case of the pressing means 40a configured in this way, it is possible to achieve the same effects as the pressing means 40 shown in the above-mentioned embodiment.

Furthermore, in the embodiments shown in FIGS. 1 to 5,
The head slider 39 is made of a magnetic material, but as shown by the broken line X in FIG. It may also be made of synthetic resin or the like.

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

Furthermore, in the above embodiment, the magnetic head 18 is kept separated from the magnetic sheet 16 by attracting the electromagnet 42 during normal times, and the magnetic head 18 is moved away from the magnetic sheet 16 only when the release operation member 4a is pressed. 16, but on the contrary, two electromagnets that attract each other in conjunction with the operation of the release operating member are fixed to both sides of the horizontal lower surface of the guide plate. Alternatively, the head slider may be pulled upward by the attraction action of the electromagnet only when necessary, and the magnetic head may be pressed against the magnetic sheet.

Note that the present invention is also applicable to a camera configured such that the release operation member is pressed in conjunction with a self-timer device.

〔Effect of the invention〕

As described above, in the still image recording camera according to the present invention, the control circuit is controlled in conjunction with the pressing operation of the release operating member, and the drive motor starts rotating to drive the magnetic sheet and drive the magnetic head. When the control circuit detects that the rotational speed of the drive motor that contacts the magnetic sheet and then rotates the magnetic sheet reaches a specified value, the magnetic head records a video signal on the magnetic sheet. As a result, video signals can be recorded after the rotational speed of the magnetic head due to contact with the magnetic sheet is resolved.

Therefore, since video signals are recorded while the magnetic sheet is always rotating at a constant rotational speed, video signals with good recording characteristics can be recorded.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing a still image recording camera according to the present invention, which is incorporated into a so-called electronic camera, and FIG. 2 shows a state before a magnetic sheet jacket is attached to the electronic camera. The perspective view and FIG. 3 are enlarged cross-sectional views of essential parts 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 plate. FIG. 5 is an enlarged sectional view of a main part of another modification of the pressing means used in the present invention. 4a... Release operation member, 11... Magnetic recording device main body, 13... Magnetic sheet jacket, 16
...Magnetic sheet, 18...Magnetic recording head, 39
... Head slider, 40, 40a ... Pushing means, 42 ... Electromagnet, 43 ... Leaf spring, 49
a, 49b...Coil spring.

Claims (1)

[Scope of Claims] 1. A drive motor controlled by a control circuit that rotationally drives a magnetic sheet; and according to a pressing operation, the control circuit is controlled to start rotation of the drive motor and rotationally drive the magnetic sheet. a release operation member that captures an image of a subject; a video signal processing circuit and a magnetic head that sequentially record video signals for one field or one frame on the magnetic sheet so as to form a circular track; the magnetic head and the magnetic head; and a head adsorption mechanism that acts to bring the magnetic sheet into contact with or away from each other, and controls the control circuit in conjunction with the pressing operation of the release operating member to start the rotation of the drive motor and the magnetic sheet. driving the magnetic head and the magnetic sheet into contact with each other;
After the control circuit detects that the rotational speed of the drive motor has reached a specified value, the video signal processing circuit outputs a control signal to the magnetic head;
A still image recording camera configured to record video signals on the magnetic sheet using the magnetic head.