JPH07319036A - Camera - Google Patents

Abstract

PURPOSE:To provide a camera having a means capable of removing dust attached to the head gap of a magnetic head using a simple construction, without providing a new dust-wiping drive mechanism. CONSTITUTION:A pad holding lever 1 which slides vertically has an upper portion curved into an L-shape, both sides of which are curved into U-shapes as shown by 1c, 1d, with the sliding portions 2a, 2b of a sliding plate 2 engaged with the insides of 1c, 1d to slide the sliding plate 2 longitudinally. A film holding pad 3 made of an elastic body is bonded to the sliding plate 2, a brush 4 serving as a dust wiping means is located at the depth of the film holding pad 3 of the sliding plate 2, and driving shafts 5a-5c project from the final gear of a reduction gear built into the speed reduction motor 5 of the brush 4, with an end portion 5c fitted into a main body hole. A drive cam 6 is coupled between the drive shafts 5a, 5b to move the sliding plate 2 both longitudinally and vertically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a camera that uses a film with a magnetic storage unit, which has a magnetic head for writing or reading information to or from the magnetic storage unit provided in the film.

[0002]

2. Description of the Related Art Conventionally, a camera that uses a film having a magnetic storage unit and is capable of writing or reading photographic information, date, or the like into or from the magnetic storage unit by a magnetic head is disclosed in US Pat. No. 4860037 is proposed. In this type of camera, as mentioned above,
In order to write and read information with the magnetic head, a pressing member for pressing the film against the magnetic head is required at a position facing the magnetic head with the film sandwiched therebetween.

[0003]

However, in the above-mentioned conventional example, dust adhering to the surface of the film or the pressure plate during the film feeding is carried along with the film and adheres to the head gap portion of the magnetic head, and the number of shots is reduced. There was a case where the output signal was lowered with each stack.

The present invention has been made to solve the above problems, and a camera having means for removing dust adhering to the head gap of a magnetic head with a simple structure without newly providing a dust wiping drive mechanism is provided. The purpose is to provide.

[0005]

In order to achieve the above object, the camera of the present invention according to claim 1, is a magnetic head for writing information to or reading information from a magnetic storage unit provided in a film during film feeding. And a pressing means for contacting the film and the magnetic head at a position facing the magnetic head, a wiping means for wiping off dust on the surface of the magnetic head, and a writing means for reading or writing information by the magnetic head The contact between the film and the magnetic head is released by the pressure contact means, or a control means for controlling the positions of the pressure contact means and the wiping means so that the wiping means and the magnetic head are in contact with each other, and
The dust wiping means is provided on the press-contact surface of the press-contact means and outside the width direction of the film, and the control means extends parallel to the surface of the magnetic head and exceeds the magnetic storage track forming portion of the film. The wiping means is moved, and the dust wiping means is operated when there is no film on the magnetic head portion.

[0006]

According to the first aspect of the present invention, the film and the magnetic head are brought into close contact with each other by the pressure contact means, and the pressure contact means is retracted by the control means except during the recording / reproduction of the magnetic signal to bring the magnetic head and the film into the pressure contact state. And the dust on the magnetic head can be removed by the wiping means.
According to the third aspect, the wiping means moves from the outside of the width of the film during wiping to wipe off dust on the magnetic head.
According to this, dust is wiped off the magnetic head when there is no film on the magnetic head.

[0007]

1 to 7 are views showing an embodiment of the present invention, and FIG. 1 is a perspective view showing a schematic structure of a main part of a camera which is an embodiment of the present invention. 2 is a perspective view showing a camera arrangement of main parts, and FIGS. 3 to 5 are sectional views of main parts showing respective operating states. 6 is an electric block diagram of the camera of FIG. 1, and FIG. 7 is a flow chart showing the operation of the camera of FIG.

In FIG. 1, reference numeral 1 is a pad holding lever.
The elongated holes a and 1b engage with the main body shafts 111a and 111b and slide up and down. Also, the upper part of the pad holding lever 1 is bent in an L shape, and both sides are 1
It is bent in a U shape like c and 1d. The sliding portions 2a and 2b of the slide plate 2 are engaged with the insides of these 1c and 1d, and the slide plate 2 slides back and forth.

Reference numeral 3 denotes a film pressing pad made of an elastic material such as rubber, which is adhered to the slide plate 2. Also,
A dust wiping means is provided on the inner side of the film pressing pad 3 of the slide plate 2. As the dust wiping means, there are a brush, a felt, a cleaning tape and the like in addition to the brush 4 shown in the figure. Reference numeral 5 denotes a reduction motor, which is mounted in a main body mounting hole (not shown) by mounting holes 5d and 5e.
a, 5b, 5c are projected, and the tip portion 5c is fitted in a body hole (not shown). A drive cam 6 is coupled between the drive shafts 5a and 5b to move the slide plate 2 back and forth and vertically. A control board 7 is coupled between the drive shafts 5b and 5c, and the rotational phase of the drive cam 6 is detected by turning on / off the pattern formed on the control board 7 and the control contact piece 8.

Reference numeral 9 denotes a pressing spring that is hooked on the protruding portion 1f of the pad holding lever 1 and the main body pin 111c, and urges the pad holding lever 1 to the pushing up side. Reference numeral 10 denotes a slide spring that is hooked on the vertically bent protrusion 1e of the pad holding lever 1 and the pin 2d of the slide plate 2, and biases the slide plate 2 toward the drive cam 6 side. At this time, the end of the sliding portion 2b of the slide plate 2 is prevented from coming off, and when it slides toward the drive cam 6, the protrusion 2c and the U-shaped end 1d of the pad holding lever 1 abut.

FIG. 2 shows a state in which the pad drive unit 101 shown in FIG. 1 is incorporated in the camera body 11. In FIG. 2, reference numeral 16 is a cartridge in which the film 15 having a transparent magnetic layer on the base surface is housed. Reference numeral 15a is a perforation on the film 15, and 17 is a cartridge spool.
And unwind. Reference numeral 11 denotes a main body, which contains a cartridge 16 and a fork (not shown) for driving the cartridge spool 17, and a cartridge chamber 11c having therein a fork drive section, a spool (not shown) for winding the film 15 fed from the cartridge 16, and It is composed of a spool chamber 11d containing the spool drive section, an outer rail 11a and an inner rail 11b formed to secure a tunnel for the film 15 to pass through, an aperture 11e of a photographing screen frame, and the like. Reference numeral 12 denotes a crimping plate, which is composed of a hole 12a for screwing into a screw hole 11f on the outer rail 11a of the main body 11 and a hole 12b for fitting a position regulation with a pin 11g on the outer rail 11a of the main body 11. It A photoreflector 13 is fixed to the crimping plate 12 to detect the perforation 15a of the known film 15. Reference numeral 14 is a magnetic head for writing photographing information or reading magnetic information on the film 15.

FIG. 3 shows a reading or writing state of magnetic information, that is, a feeding state. At this time, the drive cam 6
3a from the release surface 6a on the radial line of FIG.
A cam surface 6b that is connected to the release surface on the radially outer side in the clockwise direction.
Is retracted to a position where it does not interfere with the operation of the slide plate 2, the pad 3 is pressed by the urging force of the pressing spring 9, the film 15 is pressed against the magnetic head 14, and reliable reading and writing of information is performed.

FIG. 4 shows a photographing state, in which the drive cam 6 is rotated about 15 ° in the clockwise direction (direction A) in FIG. 3 and the slide plate 2 is pushed down by the release surface 6a.
The pressure contact by pressing the pad 3 is released, and the pad 15 is released to a position where it does not interfere with the film 15 so as not to affect the flatness of the film.

FIG. 5 shows a state in which dust adhering to the magnetic head 14 is being wiped, and the film 15 has the magnetic head 14
When it is not on the top (immediately after setting the cartridge or after the completion of winding), it rotates about 340 ° in the counterclockwise direction (B direction) in the figure from the position of the drive cam 6 in FIG.
With the slide plate 2 extended, the brush 4 is pressed by the urging force of the pressing spring 9 in this process.
Since it moves along 4, the dust attached to the head portion is wiped off. After that, when the drive cam 6 is rotated in the clockwise direction to the position shown in FIG. 3 by the urging force of the slide spring 10, the wiping ends.

FIG. 6 is an electric block diagram, in which 19 is a control unit, 20 is a battery, 21 and 22 are motor drivers, and 25 is a film feeding motor. The fork drive unit and the fork drive unit built in the main body of FIG. It is connected to the spool drive. Two
Reference numerals 3 and 24 denote switches that are turned on by operating a release button (not shown). The first-stage switch 23 is SW1, and the second-stage switch 24 is SW2. 27 is a cartridge detection switch which is turned on when the cartridge 16 is stored in the cartridge chamber 11c, 28 is a cartridge lid opening / closing switch which is turned on by closing a lid (not shown) of the cartridge chamber 11c, 29 is distance measuring, color measurement, It is another control circuit that performs shutter control and the like.

FIG. 7 is a flow chart showing the operation of the control unit 19. Hereinafter, the first embodiment of the present invention shown in FIGS.
The operation of the embodiment will be described with reference to the flowchart of FIG. Each step in FIG. 7 is abbreviated as S.

First, the operation is started (S101), and the cartridge detection switch 27 is detected (S102). This makes it possible to detect that the cartridge 16 is loaded in the cartridge chamber 11c of the camera body. Next, the cartridge lid detection switch 28 is detected (S1
03)). In the case of Yes, the cartridge 16 is loaded in the camera body and the cartridge lid (not shown) is closed. When No, the cartridge lid is open. Then, in the case of Yes, the deceleration motor 5 is normally rotated by the motor driver 21, and the drive cam 6 is rotated about 340 ° from the film feeding state to the wiping state (from the position in FIG.
When the control contact piece 8 detects the wiping state, the deceleration motor 5 is stopped (S105). At this time, dust attached to the gap of the magnetic head 14 is wiped off by the brush 4.

Subsequently, the deceleration motor 5 is rotated in the reverse direction by the motor driver 21, and the drive cam 6 is returned from the wiping state to the film feeding state by 340 ° (from the position of FIG. 5 to the position of FIG. 3 in the clockwise direction A). (Rotating direction) (S106), when the control contact piece 8 detects the state during film feeding, the motor 5 is stopped (S107).

Next, the motor 25 drives the film feeding motor 25 in the normal direction to drive a fork and a spool (not shown) (S108). At this time, the drive of the fork is transmitted to the cartridge spool 17 in the cartridge 16, and the film 15 comes out of the cartridge 16. It is detected by the phototransistor inside the photoreflector 13 that the reflectance of the light projected from the light emitting diode (not shown) inside the photoreflector 13 changes when the film 15 passes in front of the photodetector 13 for film detection. Then, the control unit 19 detects that the film 15 has passed in front of the photo reflector 13 (S
109). Further, when the film 15 is sent out, it is wound on a spool (not shown) in the spool chamber 11d of the main body 11. The winding speed of the spool is controlled by the fork and spool drive unit so as to be higher than the film feeding speed. When the film 15 is further fed and the perforation 15a of the film 15 detected by the control unit 19 reaches the first frame, the film feeding motor 25 is stopped (S110).

Next, the deceleration motor 5 is normally rotated by the motor driver 21, and the drive cam 6 is rotated clockwise by about 15 ° (direction A) from the feeding state to the photographing state (FIG. 4) (S).
111), when the control contact piece 8 detects the photographing state, the deceleration motor 5 is stopped (S112).

Next, it is detected whether or not the switch 23 (SW1) is turned on by operating a release button (not shown) (S113). When the switch 23 (SW1) is turned on,
Before the shutter is opened, operations such as distance measurement and photometry are performed by the other control circuit 29 (S114). Further, it is detected whether a release button (not shown) is pressed and the switch 24 (SW2) is turned on (S115). Switch 24 (SW
When 2) is turned on, the shutter (not shown) is opened by the other control circuit 29 and closed after a certain time (S116).

Next, the deceleration motor 5 is rotated in the reverse direction by the motor driver 21 to return about 15 ° rotated in S111 (S11).
117). When the control contact piece 8 detects the feeding state, the deceleration motor 5 is stopped (S118).

Next, the motor driver 22 rotates the film feeding motor 25 in the forward direction to feed the film (S).
119). At the same time, the other control circuit 29 energizes the magnetic head 14 to write photographing information. The energization timing, the writing frequency, etc. at this time detect the perforation 15a of the film 15, and the controller 19 calculates the
It is transmitted to the other control circuit 29 (S120). When the perforation 15a detected by the photo reflector 13 reaches one frame (S121), the motor driver 22
Stops the film feeding motor 25 (S12
2).

Next, the drive cam is brought into the photographing state as in S111 and 112 (S123 and 124).

Next, it is checked whether or not the number of photographed frames is a predetermined value (final frame) (S125). When the number of frames is the final frame, all the photographed frames on the film 15 have already been photographed. If there is, the process proceeds to S126 to rewind the film 15. If not, the process proceeds to S113 to enter the shooting standby state.

Next, the film driver motor 25 is rotated in the reverse direction by the motor driver 22, and the fork (not shown) is rotated in the reverse direction so that the film 15 is fed in the direction to be stored in the cartridge 16 (S126). When the detection of the perforations 15a by the photo reflector 13 reaches the number of photographed sheets (S127), the feeding motor 25 is used for the time when the leader portion of the film 15 is completely set in the cartridge 16.
After reversing, the motor driver 22 stops the film feeding motor 25 (S128).

[0027]

Correspondence between the invention and the embodiment In the embodiment, the pressing means corresponds to a structure in which the film pressing pad 3 presses the film 15 against the magnetic head 14 by the urging force of the pressing spring 9. The dust wiping means of No. 1 corresponds to the structure of wiping the dust of the magnetic head 14 by the brush 4 of the embodiment, and further, the contact between the film and the magnetic head is released by the pressing means of the present invention, or the wiping means is used as the magnetic head. In the embodiment, the control means for controlling whether or not to make contact with the O is formed between the pattern formed on the substrate 7 and the control contact piece 8.
The rotation phase of the drive cam 6 is detected by N / OFF,
This corresponds to a configuration in which the drive and stop of the deceleration motor 5 are controlled to control the pressure contact state between the magnetic head 14 and the film 15 or the contact state between the brush 4 of the wiping means and the magnetic head 14.

The above is the correspondence relationship between each configuration of the embodiments and each configuration of the present invention, but the present invention is not limited to the configurations of these embodiments, and a configuration capable of achieving the functions shown in the claims. It goes without saying that any kind of structure may be used.

The present invention can be applied to a single-lens reflex camera, a lens shutter camera, a video camera, and optical equipment other than the camera and other devices.

[0030]

As described above, according to the first aspect of the present invention.
According to the invention, there is provided a pressure contact means for bringing the film and the magnetic head into close contact with each other, a control means for releasing the pressure contact means except when recording and reproducing a magnetic signal, and a wiping means. By defining the movement of the wiping means for wiping the magnetic head by means of 2, further according to claim 3, when the magnetic head portion has no film, it also serves as a dust wiping means of the magnetic head. It is possible to stably record and reproduce magnetic information without generating dust in the camera without newly providing a dust wiping drive mechanism.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a main part of a camera according to an embodiment of the present invention.

FIG. 2 is an overall perspective view of the main part of FIG. 1 incorporated into a camera body.

3 is a front view of the head portion of the camera of FIG. 1 during magnetic recording / reproduction.

FIG. 4 is a front view of the head portion of the camera of FIG. 1 during shooting.

5 is a front view of the head portion of the camera of FIG. 1 when wiping off dust.

FIG. 6 is an electrical block diagram of the camera of FIG.

7 is a flowchart showing an operation of the camera of FIG.

[Explanation of symbols]

 1 Pad Holding Lever 2 Slide Plate 3 Film Press Pad 4 Dust Removal Brush 5 Reduction Motor 6 Drive Cam 7 Control Board 8 Control Contact Piece 9 Push Spring 10 Slide Spring 11 Main Body 12 Crimping Plate 13 Photo Reflector 14 Magnetic Head 15 Film 16 Cartridge 17 Cartridge spool 19 Control unit 20 Battery 21,22 Motor driver 23 SW1 release switch 24 SW2 release switch 25 Feed motor 27 Cartridge detection switch 28 Cartridge lid detection switch 29 Other control circuits

Claims (3)

[Claims] 1. A magnetic head for writing or reading information to or from a magnetic storage unit provided in a film during film feeding, and a press-contact means for contacting the film and the magnetic head at a position facing the magnetic head. And a wiping means for wiping off dust on the magnetic head surface, and releasing the close contact between the film and the magnetic head by the pressure contact means except when writing or reading information by the magnetic head, or the wiping means and the magnetic head A camera comprising: a pressure contact means and a control means for controlling the positions of the wiping means so as to be in contact with each other. 2. A dust wiping means is provided on the press-contact surface of the press-contact means and outside the width direction of the film, and by the control means, in parallel with the magnetic head surface, only an amount exceeding the magnetic memory track forming portion of the film. The camera according to claim 1, wherein the wiping means is moved. 3. The camera according to claim 1, wherein the dust wiping means operates when there is no film on the magnetic head portion.