JPH02185772A - Still picture recording camera - Google Patents

Abstract

PURPOSE:To prevent the surface of a magnetic head which contacts a magnetic sheet from wearing off and the sheet from damaging by driving and rotating the magnetic sheet associatively with a 1st position of a release operation member and bringing the magnetic head and magnetic head into contact with each other associatively with a 2nd position. CONSTITUTION:When the release operation member 4a is half-pressed to reach the 1st position, a shutter control circuit 4 operates to drive a control circuit for a driving motor 24, which rotates. Then when the release operation member 4a is further pressed to reach a 2nd position, a pressing means 40 is driven. Namely, the supply of a current to the coil of the electromagnet 42 is stopped, an electromagnet 42 stops attracting operation, and a leaf spring 43 pushes up a head slider 39 to make the magnetic head 18 abut on the magnetic sheet. Then a prescribed control signal is supplied from a signal recording circuit 10 to the magnetic head 18 to record a necessary video signal. Consequently, the sheet contacting surface of the magnetic head is prevented from wearing off and the sheet is prevented from damaging.

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 annular magnetic sheets that are rotated by a sheet rotation drive device provided in a camera body. The present invention relates to a still image recording camera that performs magnetic recording by forming recording tracks.

[Conventional technology]

The applicant has previously proposed a novel static image signal that can record and/or reproduce 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 it is driven to rotate, and then the drive motor of the sheet rotation drive device is driven to rotate 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 constituting the sheet rotation drive device starts up extremely quickly, it is not necessary to bring the magnetic head into contact with the magnetic sheet from the beginning of the rotation of the magnetic sheet. Since it takes several seconds (for example, about 2 to 3 seconds) for the drive motor to start up, the magnetic head is in unnecessary contact with the magnetic sheet during the time required for the start-up.

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

In this way, if the magnetic head continues to be in unnecessary contact with the magnetic sheet, the surface of the magnetic head that faces the sheet will wear out faster, and the signal recording surface of the magnetic sheet will wear out and become more damaged. Not.

Therefore, the present invention was 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.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes a release operation member having a first position for starting rotational drive of a magnetic sheet in accordance with 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 field or one frame sequentially in a circular track;
It consists of an electromagnet and an elastic member that act to bring the magnetic head and the magnetic sheet into contact with or apart from each other, and rotates the magnetic sheet in conjunction with the first position of the release operation member, and 1, the magnetic head and the magnetic sheet are brought into contact with each other, and a video signal is recorded on the magnetic sheet.

[Effect]

In the present invention, when the release operation member is operated to the first position, the magnetic sheet is rotationally driven, and when the release operation member is operated to the second position, the magnetic head and the magnetic sheet are brought into contact with each other. The Nm stone is operated to bring the magnetic head and the magnetic sheet into contact with each other, and a video signal is recorded on the magnetic sheet.

〔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 also shows 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, and a release operating member 4, as in a normal photosensitive film camera.
A, a shutter control circuit 4 driven by the release operating member 4a, a shutter portion 5 driven to open and close by the shutter control circuit 4, a mirror 6.7, a viewfinder 8, etc. are provided. Further, as parts unique to an electronic camera, a light sensor part 9 of a solid-state image sensor (CCD etc.), a signal recording circuit 10. A magnetic recording device main body 11 and the like are provided.

The magnetic recording device main body 11 built into the camera housing 1 is
As shown in FIG. 2, a magnetic sheet jacket 13 is provided on the mounting board 12.
A jacket holder 14 that can be inserted and removed is attached to the jacket holder 14 by a hinge shaft 15a so as to be openable and closable. A disk-shaped magnetic sheet 16 is rotatably housed in a jacket housing 15 constituting the outer housing portion of the magnetic sheet jacket 13. On this sheet 16, for example, one field of still image information, etc. Alternatively, video signals for one frame are magnetically recorded to form a plurality of annular tracks. A window 17 is formed in a part of the jacket housing 15, and the magnetic sheet 16
Part of it is exposed to the outside. This window part 1
One or more (one in this embodiment) magnetic head 18 is inserted into the magnetic head 7 , 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 (from the inner circumferential direction to the outer circumferential direction in this embodiment) for each rotation of the magnetic sheet 16. A plurality of video signals are magnetically recorded in a ring shape on the top.

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

The magnetic head 18 is attached to the middle part of the moving arm 25 that constitutes the head moving operation section 23.
This magnetic head 18 has a head protruding 8 formed on a guide plate 22 for stabilizing contact with the magnetic sheet 16.
The inside of the portion 26 is viewed from a lower position. This guide board 22
A pair of height regulating pins 27, 27 are installed on the top. 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 one end 30a of a spring 30 is locked to the movable arm 25, and this movable arm 25 is connected to the pivot shaft 3.
1 is constantly being pulled in the direction of arrow A in FIG.

A fixed shaft 33 that is inserted into the insertion hole 32 of the magnetic sheet jacket 13 is disposed approximately in the center of the mounting board 12, and around this fixed shaft 33 there is a structure shown in FIGS. 2 and 4. As shown in the figure, the rotary table 20 is rotatably attached.

A belt 35a is passed 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 insertion hole of 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 device main body 11. 32 and protrudes above the magnetic sheet jacket 13, and this tip portion 33a abuts and engages with a spacing adjustment screw 36 screwed onto the tip of the regulating plate 29. It looks like this.

Further, as shown in FIG. 3, the guide @ 22 is inserted into the window 17 of the magnetic sheet jacket 13 so that the magnetic sheet 16 inside the sheet jacket 13 is rotated in a stable state. It is intended to guide the
As shown in FIG. 4, this guide plate 22 is integrally formed with a plate-shaped horizontal portion 37 and a base end block 38 formed at its base end. A sheet guide surface 37a for guiding the sheet 16 so as to be practically parallel to its rotating surface is formed in the shape of a flat surface. This sheet guide surface 37a is formed by the magnetic head 1.
8 is for regulating the position of the sheet 16 from the lower surface side in the vicinity of the head contact portion where it contacts the magnetic sheet 16 (see Fig. 3). The edge 37b is chamfered in an arc shape. In addition, on the lower surface of the proximal block 38,
Guide surfaces 38d and 38e are formed, and the upper surfaces of the contact sliding portions 39a and 39b of the head slider 39 to which the magnetic head 18 is attached slide in opposition to each other on the guide surfaces 38d and 38e. It looks like this. These guide surfaces 38d and 38e are 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 provided so that the magnetic head 18 can track all the recording tracks between the innermost track and the outermost track of the sheet 16 for magnetic recording on the magnetic sheet 16. magnetic head 18
The opening is made to project above the sheet guide surface 37a of the guide plate 22.

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 from the innermost track to the outermost track on the magnetic sheet 16. This is for tracking operation of the magnetic head 18 so that required information can be sequentially magnetically recorded over the 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, and the head moving arm 25 is attached to the middle part of the head moving arm 25. The magnetic head 18 is integrally mounted on the head slider 39 as described above.

A pressing means 40 for bringing the magnetic head 18 into contact with the magnetic sheet 16 is arranged between the Rad slider 39 and the head moving arm 25.

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 guides the head slider 39 only in the vertical direction. Guide pins 41a, 41b and each of these guide pins 41a, 41b
and a plate spring 43 interposed between the Rad slider 39 and the head moving arm 25 so as to cover the upper part of the electromagnet 42. It is configured.

One end of the slider 39 has a through hole 44 through which a guide pin 41b is inserted, as shown in FIG. 4, and the other end has a notch 45 through which a 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 includes an iron core 42a fixed on the head moving arm 25 and a coil 4 wound around the iron core 42a.
2b, but this coil 42b includes:
Current is supplied in connection with the operation of the release operation member 4a. Further, the temporary spring 43 has a central portion protruding upward, and both ends thereof have
A through hole 43a and a notch 43b are formed. Each guide pin 41 is provided in the through hole 43a and the notch 43b.
b, 41a is inserted.

This plate 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 on the head slider 39 side. is elastically biased in the 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. The case cover 28 is formed of a rectangular sheet regulating portion 29a and a plate-shaped attachment portion 29b integrally formed on the upper surface of the regulating portion 29a, and faces the guide plate 22.
It is located on the side. Note that the regulation plate 29
As shown in the figure, it is supported movably in the axial direction by four locking pins 46a, . . . installed in the case cover 28.

Moreover, between this case cover 28 and the regulation plate 29,
A compression spring 47 is interposed.

Therefore, due to the elastic force of the compression spring 47, the regulating 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 forms a magnetic seal (16) with the sheet guiding surface 37a of the aforementioned guiding plate 22.
This is for regulating the position of the magnetic recording surface 16a at a predetermined distance from both the upper and lower 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 body 11 by a pushing operation of the jacket holder 14. When this is done, the magnetic sheet jacket 13
The fixed shaft 33 is inserted into the insertion hole 32 of the reinforcing member 19 provided at the center of rotation of the magnetic sheet 16 in the jacket housing 15 through the center hole 48 formed in the center of the magnetic sheet 16 .

At the same time, the regulating portion 29a of the regulating plate 29 and the guide plate 22
The horizontal portion 37 of the magnetic sheet jacket 13 is inserted into the window 17 of the magnetic sheet jacket 13 at a predetermined interval, and is opposed to each other within the window 17. Therefore, the magnetic recording surface 16a of the magnetic sheet 16 and the sheet guide surface 37a of the guide plate 22 are as follows.
They will face each other. In addition, at this time, the electromagnet 4
The head slider 39 is lowered by the adsorption action of the magnetic head 2, and therefore, the helad tip of the magnetic head 48 is separated from the magnetic recording surface 16a.

Next, in the first stage, when the release operation member 14a reaches the first position where it is pressed halfway, the shutter control circuit 4
works, and the drive motor control circuit (not shown in the figure) is driven.
The drive motor 24 starts rotating due to the operation of this circuit. 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 IT magnet 42 is stopped, and the electromagnet 42 stops its attracting 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 due to its spring force. Therefore, the head slider 39 is guided by the guide pins 41a and 41b while being guided by the guide surfaces 38d and 38e provided on the lower surface of the guide plate 22.
The contact sliding portions 39a and 39b are pushed up until they come into contact with each other. each contact sliding portion 39a of the head slider 39;
When the magnetic head 39b comes into contact with the guide surfaces 38d and 38e of the guide plate 22, the magnetic head 1 provided on the head slider 39
The Herad chip 8 is attached to the magnetic recording surface 16 of the magnetic sheet 16.
a. Note that at this time, the rotational speed of the magnetic sheet 16 is degraded due to the contact of the head chip with the magnetic recording surface 16a, but when this degradation is resolved and the rotational speed reaches the specified value again, the signal recording circuit 10 immediately A predetermined control signal is supplied from the magnetic head 18 to the magnetic head 18 . Therefore, the magnetic recording surface 1 of the magnetic sheet 16 is
When 6M1 recording is completed, in which a required video signal is magnetically recorded to form an annular recording track on 6a, current is supplied to coil 42b of electromagnet 42, and therefore the attraction action of electromagnet 42 is started. Therefore, the head slider 39 is lowered by its adsorption action, and therefore, the herad tip of the magnetic head 18 separates from the magnetic recording surface 16a of the magnetic sheet 16. Follow.

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 above, a leaf spring 43 is disposed at a lower position of the head slider 39, and the spring force of the leaf spring 43 pushes up the head slider 39 to move the magnetic head 18 onto the magnetic sheet 16. However, in this embodiment, coil springs 49a and 49b are arranged at the lower position of the head slider 39 and around each of the guide pins 4]a and 41b. The head slider 39 is pushed up by the spring force of the coil springs 49a and 49b, and the magnetic head 1B is pressed against the magnetic sheet 16.

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.

Further, in the embodiments shown in FIGS. 1 to 5, the head slider 39 is made of a magnetic material, but the head slider 39 is partially damaged in FIG.
As shown by sX, a magnetic material may be embedded only in the portion of the head slider 39 facing the electromagnet 42, and the other portions of the hent slider 390 may be formed of hard synthetic resin or the like.

Furthermore, as another configuration example of the pressing means 40, a self-holding plunger is fixed on the head moving arm 25, and this plunger is configured to be driven in conjunction with the operation of the release operation member 4a. Good too.

Furthermore, in the above embodiment, the magnetic head 18 is kept separated from the magnetic sheet 16 by attracting the magnet 42 during normal times, and the magnetic head 18 is moved only when the release operation member 4a is pressed. Although it is configured to be brought into contact with the magnetic sheet 16, on the contrary, two electromagnets that attract each other in conjunction with the operation of the release operating member are fixed to the horizontal lower screen side positions of the guide plate. It may be configured such that the head slider is pulled upward by the attraction action of the electromagnet only when necessary, and the magnetic head is 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.

[Effects of the Invention] As described above, the present invention rotates the magnetic sheet in relation to the operation of moving the release operation member to the first position, and rotates the magnetic sheet in connection with the operation of moving the release operation member to the second position. In connection with this, the pressing means that brings the magnetic head into contact with the magnetic sheet is pressed to record the video signal, so the contact between the magnetic head and the magnetic sheet is made only when the release operation member is moved the most. In addition, since the magnetic head and the magnetic sheet are brought into contact with each other while the magnetic sheet is already being rotated, the start-up when recording a video signal on the magnetic sheet is quick, and the video signal can be recorded quickly. It can be carried out. Further, since the magnetic head and the magnetic sheet come into contact only when the release operating member is operated, there is no need to unnecessarily bring the magnetic head into contact with the magnetic sheet.

Therefore, it is possible to avoid unnecessarily bringing the magnetic head into contact with the magnetic sheet, thereby preventing wear on the contact surface of the magnetic head with the magnetic sheet, and preventing wear or damage on the magnetic sheet. It is possible to maintain good magnetic recording or reproduction over a long period of time.

[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 installed in a so-called electronic camera, and FIG. 2 is a perspective view showing the electronic camera before a magnetic sheet jacket is attached. The third figure is an enlarged cross-sectional view of the 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 plate. FIG. 5 is an enlarged sectional view of a main part of another modification of the pressing means used in the present invention. a... Release operation member 1... Magnetic recording device main body 3... Magnetic sheet jacket 6... Magnetic sheet 8... Magnetic recording head 39... Head slider 40.40a... Pushing means 42... Electromagnet 43... Temporary spring

Claims (1)

[Scope of Claims] A release operation 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; It consists of a video signal processing circuit and a magnetic head that record signals in a sequential manner to record annular tracks, and an electromagnet and an elastic member that act to bring the magnetic head and the magnetic sheet into contact with or apart from each other, and the release operation The magnetic sheet is rotated in conjunction with the first position of the member, and the magnetic head and the magnetic sheet are brought into contact with each other in conjunction with the second position, and a video signal is recorded on the magnetic sheet. Still image recording camera.