JPH0527319A - Camera - Google Patents

Abstract

PURPOSE:To prevent a film from being unpreparedly exposed under a state that photographing is not executed by a camera by providing a rewinding instruction means. CONSTITUTION:A timer means which starts a counting action when it is detected by mode switching means 4, 7 and 8 that a mode is switched to an non-photographing mode from a photographing mode and the rewinding instruction means which starts the rewinding action of the film in a film cartridge by driving a film feeding means when the counted value of the timer means arrives at a prescribed value are provided. Besides, the rewinding instruction means which starts the rewinding action of the film in the film cartridge by driving the film feeding means when it is detected by a detection means that a photographing lens is removed from the camera main body is provided. Then, the film is rewound in the film cartridge in the case that the photographing is not executed by the camera. Therefore, the film is prevented from being unpreparedly exposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mode switching means for switching the state of a camera to either a photographing mode which enables a release or a non-photographing mode which prohibits a release. Alternatively, the present invention relates to an improvement of a camera provided with a detection means for detecting the mounting state of the photographing lens on the camera body.

[0002]

2. Description of the Related Art In a conventional camera, after the film cartridge is loaded and the first frame of the film is cued, the first film is generally taken until the photographing is finished, that is, the first film. The film was not rewound into the film cartridge until the filming from the first frame to the last frame was completed.

There is also a method in which a film taken halfway is rewound and then re-loaded to continue shooting from the unphotographed frame position of the film. Since it is rewound into the film cartridge, it is complicated to pull out the tip of the film cartridge from the inside of the film cartridge and set it in the camera at the time of reloading again. If it is different from the time of setting, coupled with the misrecognition of the number of frames when rewinding midway, it is not possible to find the position of the non-photographed frame well, and some films are wasted or double exposed. Because it is easy to cause, unless it is a person who is very familiar with the camera, it is difficult.

[0004]

Therefore, the film is usually left in that state for a long time until the filming of one film is completed. Therefore, it has the following problems.

1) In recent years, the components of the camera have been made of plastic, so that it is impossible to completely block light, and the film is exposed if left for a long time.

2) In a camera in which the taking lens can be removed, when the taking lens is removed, light from various angles other than the angle of view determined by the taking lens easily enters the inside of the camera and the mirror box Light easily leaks into the inside or other portions of the film that are shielded from light, causing the same problem as in 1) above.

In view of the above points, an object of the present invention is to provide a camera capable of preventing the film from being unintentionally exposed in the non-photographing state of the camera.

[0008]

SUMMARY OF THE INVENTION The present invention includes timer means for starting a counting operation by detecting that the photographing mode has been switched to the non-photographing mode by the mode switching means, and the timer means. When the count value of the timer means reaches a predetermined value, a rewind instruction means for driving the film feeding means to start the rewinding operation of the film into the film cartridge is provided, and the detecting means is provided with the photographing lens. Rewinding instruction means for driving the film feeding means to start the rewinding operation of the film into the film cartridge by detecting that the film has been removed from the camera body is provided.

[0009]

When the camera is in the non-photographing state, the film is rewound into the film cartridge.

[0010]

1 to 8 show a first embodiment of the present invention.

1 to 3, B is a release button, F is a finder portion, and L is a taking lens. Reference numeral 1 denotes a lens barrel, which incorporates a taking lens L and a lens driving device for driving the taking lens L to perform a focusing operation.

Reference numeral 2 denotes a film cartridge loaded in a cartridge chamber (not shown), which is a film 2a stored therein.
Has a magnetic storage unit known in U.S. Pat. No. 4,977,419, etc., and information such as photographing information is written in or read from the magnetic storage unit by a magnetic head described later. Also, the film cover used in this example.
The trench 1 has the following structure proposed in US Pat. No. 4,834,306 and the like.

That is, a film passing slit and one end of which is fixed to a supply spool and wound around the supply spool, and a film which is coaxially arranged with the supply spool and regulates the radial spread of the outermost circumference of the film. And a pressing member for preventing the outermost periphery of the film from substantially contacting the inner wall of the film cartridge, and a part of the pressing member is deformed,
The pressing member is provided with a releasing portion for continuously releasing the outermost peripheral portion of the film from the regulation in the radial direction, and a guiding portion for guiding the portion of the film released from the regulation to the film passage slit, and engages with the fork. The outer circumference of the film expands due to the looseness of the film caused by the rotation of the supply spool in the film extrusion direction, so that there is no slip between the outer periphery of the film and the holding member, and a driving force in the film extrusion direction is applied to the film cartridge. It enables the extrusion of the film from the.

Hereinafter, the film cartridge in which the film can be extruded by rotating the supply spool as described above will be referred to as an extruding film cartridge.

Reference numeral 3 is an exterior cover. Reference numeral 4 denotes a barrier, which is attached to the exterior cover 3 so as to be slidable in the direction of the arrow A (see FIG. 1) or in the direction opposite to the arrow A, and a knob portion 4a thereof.
Is exposed from the slit 3b of the outer cover 3 and can be directly operated from the outside.

Reference numeral 5 denotes a magnetic head for reading or writing information such as photographing information in the magnetic storage portion of the film 2a as the film runs, and is attached to a body (not shown) or a film pressure plate (not shown). .

Reference numeral 6 is a click plate made of an elastic material, and one end 6b of the click plate is attached to the outer cover 3 and the bent portion 6a is formed.
Can be engaged with the V-shaped grooves 4b and 4c of the barrier 4, and by engaging with these, positioning is performed so that the barrier 4 does not move carelessly. At the position where the barrier 4 is retracted from the optical path of the taking lens as shown in FIG. 1, the bent portion 6a is engaged with the V-shaped groove 4b, and the barrier 4 covers the taking lens L as shown in FIG. V groove 4 in position
It is designed to engage with c.

Reference numeral 7 is a count start switch, and the contact piece 7a is in a position where it can come into contact with the end surface of the barrier 4, and the contact piece 7a does not come into contact with the barrier 4 in the state shown in FIG.
The contact piece 7a and the contact piece 7b are in a non-conductive state, and in the state shown in FIG. 2, the contact piece 7a is deformed by the end surface of the barrier 4,
The a and the contact piece 7b are electrically connected.

Reference numeral 8 is a main switch, and the contact piece 8a is in a position where it can come into contact with the end surface of the barrier 4, and in the state shown in FIG. 1, the contact piece 8a comes into contact with the end surface of the barrier 4 and is deformed. The contact piece 8b and the contact piece 8b are in a conductive state. In the state shown in FIG. 2, the contact piece 8a is not in contact with the barrier 4 and the contact piece 8a and the contact piece 8b are in a non-conductive state.

4 to 6 are views showing a film feeding gear train.

In these figures, reference numeral 11 is a film feeding motor, which is normally rotated when the film is wound (in the direction of arrow B in FIG. 5) and reversely rotated when the film is rewound (in the direction of arrow C in FIG. 6). Reference numeral 12 is a pinion gear fixed to the rotary shaft of the motor 11. A first sun gear 13 meshes with the pinion gear 12. Reference numeral 14 denotes a first planetary gear, which meshes with the first sun gear 13. 15
Connects the first sun gear 13 and the first planetary gear 14, and holds the first planetary gear 14 rotatably while generating frictional force between the first sun gear 13 and the first planetary gear 14. The first planetary gear 14 revolves around the first sun gear 13 as the center of rotation by the rotation of the first sun gear 53. The first sun gear 13, the first planetary gear 14, and the first connecting lever-1
5 constitutes a known planetary gear mechanism. Reference numeral 16 is a spool gear which meshes with the first planetary gear 14 only when the film feeding motor 11 is rotated in the normal direction. Reference numeral 17 is a film winding spool that is fixed to the spool gear 16 and moves integrally.

Reference numeral 18 denotes a first idler gear that always meshes with the first sun gear 13, 19 has a large gear portion 19a and a small gear portion 19b, and a large gear portion 19a meshes with the first idler gear 18 for the first idler gear 18. Two-stage gear, 20 is the first
Second idler gear that meshes with the small gear portion 19b of the two-stage gear 19, 21 is a third idler gear that meshes with the second idler gear 20, 22 is a second sun gear that meshes with the third idler gear 21, and 23 is It is a second planetary gear that meshes with the second sun gear 22. 24 is the third
This planetary gear is engaged with the second sun gear, like the second planetary gear 23. Numeral 25 connects the second sun gear 22, the second planetary gear 23, and the third planetary gear 24 with arm portions 25a and 25b, respectively, and rotatably holds each planetary gear while generating frictional force. This is a second connecting lever in which the second planetary gear 23 and the third planetary gear 24 revolve around the second sun gear 22 as a rotation center by the rotation of the second sun gear 22. . The second sun gear 62 and the second and third planetary gears 23, 24
A publicly known planetary gear mechanism is constituted by the second connecting lever 25 and the second connecting lever 25.

Numeral 26 is a fourth idler gear, which is a second idler gear of the second connecting lever 25 when the film feeding motor 11 is rotated in the normal direction.
Rotation of the sun gear 22 in the left direction meshes with the second planetary gear 23 and does not mesh with the third planetary gear 24. When the motor 11 rotates in the reverse direction, the right side of the second connecting lever 25 is rotated. It is a gear that meshes with the third planetary gear and does not mesh with the second planetary gear 23 by the rotation in the direction. 27 has a large gear portion 27a and a small gear portion 27b, the large gear portion 27a is a second two-stage gear that meshes with the fourth idler 26, and 28 has a large gear portion 28a and a small gear portion 28b. Part 2
Reference numeral 8a denotes a third two-stage gear that meshes with the small gear portion 27b of the second two-stage gear 27, 29 denotes a fork gear that meshes with the small gear portion 28b of the third two-stage gear 28, and 30 denotes the fork. A fork that rotates integrally with the gear gear 29, which causes the supply spool 2b (not shown) in the film cartridge 2 (see FIG. 3) to rotate, so that the film 2a from the inside of the film cartridge 2 is rotated. Is extruded and rolled up.

If the extruding film cartridge 2 is used, after the film is loaded into the camera, the fork 30 can be used to set the leading end of the film at a predetermined position without any troublesome work. The supply spool 2b of the cartridge 2 is rotated, the film 2a is discharged, the film 2a is extruded until it is wound around the film winding spool 17, and then the film 2a is fed by the film winding spool 17. It is possible to adopt a configuration that goes on.

In the above structure, after the film cartridge 2 is loaded in the cartridge chamber (not shown), the film feeding motor 11 (pinion gear 12) is provided as shown in FIG.
Is rotated in the direction of the arrow B (normally rotated), the first sun gear 13 is rotated clockwise, and along with this, the action of the first connecting lever 15 causes the first planetary gear 14 to move. Revolves clockwise around the first sun gear 13 as a center of rotation, and eventually meshes with the spool gear 16, the driving force of the film feeding motor 11 is transmitted to the spool gear 6, and the film winding spool -Le 57 will rotate clockwise.

Further, the driving force is supplied to the first two-stage gear 19, the second idler gear 20, through the idler gear 18 which is another gear meshing with the first sun gear 13.
It is transmitted to the second sun gear 22 via the third idler gear 21. Therefore, since the second sun gear 22 rotates counterclockwise, the second planetary gear 23 and the third planetary gear 24 rotate about the second sun gear by the action of the second connecting lever 25. As a result, the second planetary gear 23 comes into mesh with the fourth idler gear 26. Thereby, the film feeding motor 1
The driving force in the B direction of 1 is transmitted to the fourth idler gear 26 as a driving force in the counterclockwise direction, and further the second two-stage gear 2
7. The fork 30 is transmitted to the fork gear 29 through the third and second two-stage gear 28, and the fork 30 rotates clockwise.

Here, the gear ratio of the gear train is constructed as follows.

The peripheral speed of the film winding spool 17 is "V1", and the fork 30 is used for the film cartridge 2.
When the speed of the film 2a extruded from the film is "V2", there is a relationship of "V1>V2".

When the film 2a is extruded from the film cartridge 2 by the clockwise rotation of the fork 30, the leading end of the film is finally wound around the film winding spool 17. After that, the film 2a is wound only by rotating the film winding spool 17 by the film feeding motor 11, for the following reason.

Due to the relationship of "V1>V2", when the film 2a is wound around the film winding spool 17, the film winding spool 17 is transferred through the film 2a to the foil.
Gear 29, third two-stage gear 28, second two-stage gear 2
7 and the fourth idler gear 26 are transmitted in this order, and the counterclockwise rotation speed of the fourth idler gear 16 is faster than the clockwise rotation speed of the second planetary gear 13. This is because the idler gear 26 bounces off the second planetary gear 23, the meshing between the second planetary gear 23 and the fourth idler gear 26 is momentarily released, and the speed difference is absorbed.

Therefore, when the film 2a is wound around the film winding spool 17, the film feeding speed changes from "V2" until then to "V1". As a method of winding the film 2a around the film winding spool 17, known means (a perforation of the film 2a is hooked by a claw provided on the film winding spool, or a camera body is used). Film 2 provided in
a is pressed against the film winding spool, and the like).

Next, the operation of rewinding the film will be described.

This operation will be described with reference to FIG. 6. When the film feeding motor 11 is rotated in the direction of the arrow C, the first connecting lever 15 and the first planetary gear 14 become the first sun gear 1.
3 revolves counterclockwise about the rotation center until the end portion 15a of the first connecting lever 15 contacts the stopper 38. Therefore, the first planetary gear 14 and the spool gear 16
The mesh with is released.

At this time, the second sun gear 22 rotates in the clockwise direction, so that the second planetary gear 23 and the third planetary gear 24 are actuated by the second connecting lever 25. The gear 22 revolves clockwise around the center of rotation,
The idler gear 26 and the second planetary gear 23 are disengaged from each other, and instead, the fourth idler gear 26 and the third planetary gear 24 are engaged with each other. Therefore, the fork gear 29 rotates counterclockwise, and the fork 30 rotates the supply spool 2b in the film cartridge 2 in the reverse direction, so that the film 2a is rotated.
Are wound into the film cartridge 2.

FIG. 7 is a diagram showing a circuit block of a camera having the above structure.

In FIG. 7, 31 is a micro computer.
Control circuit having a timer inside, 35 is a film feeding drive circuit for driving the film feeding motor 11 to feed the film 2a, and 37 is a taking lens in the lens barrel 1. An AF / AE control circuit for controlling the focus of L and the operation of the exposure control shutter. 32 is a release
Switch, the release button B is pressed to turn it on, and when this switch is turned on, the camera release
Is done. Reference numeral 33 is a cartridge loading switch that is turned on when the film cartridge 2 is loaded, and 34 is a back lid switch that is turned on when the back lid is closed. These switches 33 and 34 are connected in series. When both switches are turned on, the control circuit 31 starts the cueing operation of the first frame of the film 2a.

Next, the operation of the control circuit 31 will be described according to the flow chart of FIG. "Step 101" Cartridge loading switch 33,
It is determined whether the back cover switches 34 are both turned on,
If the film cartridge 2 is loaded into the camera by determining ON, it is determined that the back cover is closed.
Go to 2. [Step 102] The film feeding drive circuit 35 is operated to start the operation of positioning the first frame of the film 2a at the aperture portion, that is, the cueing operation. "Step 103" The magnetic head drive circuit 36 is driven to read the information written in the magnetic storage portion of the film 2a, such as the type of film, the specified number of frames, and the ISO sensitivity, by the magnetic head 5. "Step 104" The first frame of the film 2a is an aperture.
It is determined whether or not it is located at the tea portion. If the first frame has not been cued, the process returns to step 102, and it is determined that the first frame has been cued, so that the film feeding drive circuit 36 is set. The feeding of the film 2a is stopped through the process, and the process proceeds to step 105. [Step 105] It is determined whether or not the main switch 8 is ON, that is, whether the barrier 4 is in the open state (the state shown in FIG. 1). If not, the process proceeds to step 106. [Step 106] It is determined whether the count start switch 7 is ON, that is, whether the barrier 4 is in the closed state (the state shown in FIG. 2), and if it is ON, it is determined that the camera is not used and the step 107 is performed. Go to O
If not, the process returns to step 105. "Step 107" The counting operation of the internal timer is started. [Step 108] At this point, the barrier 4 is operated to be in the open state, and if the main switch 48 is turned on, the process proceeds to step 119, and if not, the process proceeds to step 109. “Step 109” The count value of the internal timer that started the counting operation in step 107 is the predetermined time T1
If the main switch 8 does not turn on even after a lapse of a predetermined time, it is determined that the camera has not been used for a long time and that it will not be used immediately thereafter. The determination is made and the process proceeds to step 110. [Step 110] The film feeding motor 11 is driven through the film feeding driving circuit 35 to start the rewinding operation of the film 2a into the film cartridge 2. [Step 111] The information indicating the film frame located in the aperture of the camera before step 110, that is, the number of filmed frames at the time of midway rewinding is recorded by the magnetic head 5 via the magnetic head drive circuit 36. Write to the magnetic storage section of. "Step 112" It is judged by a known means whether or not the rewinding of the film 2a into the film cartridge 2 is completed, and it is judged that the rewinding is completed.
Go to 3. "Step 113" The film feeding motor 11 is stopped through the film feeding driving circuit 35 to set the film 2a.
The rewinding operation into the film cartridge 2 is stopped.

Since the film 2a is completely housed in the film cartridge 2 as described above, the user forgets that the film 2a is still loaded in the camera and carelessly opens the back cover of the camera. Even if you open it, film 2
a is not exposed. Further, even if the camera is left in a bright place for a long time, the film is not exposed by the light slightly passing through the exterior cover 3 of the camera. "Step 114" The counting operation of the internal timer is stopped and the internal timer is reset. "Step 115" It is determined from the state of the main switch 8 whether or not the knob portion 4a of the barrier 4 is operated again to be in the open state, and when the switch 8 is turned on, the routine proceeds to step 116. "Step 116" The film feeding motor 11 is driven in the film extrusion direction through the film feeding drive circuit 35 to start the film winding operation. "Step 117" Information is read from the magnetic storage portion of the film 2a by the magnetic head 5 via the magnetic head drive circuit 36. That is, here, the information written in step 111, that is, the number-of-photographed frames information at the time of midway rewinding is read. "Step 118" It is possible to detect the position of the next frame of the photographed frame at the time of midway rewinding by a known means, for example, a method of counting the perforations of the film, and perform the cueing. At the moment, the film feeding motor 11 is driven through the film feeding driving circuit 35.
To stop. Then, the process proceeds to step 120.

When it is determined in step 108 that the main switch 8 has been turned on within the predetermined time T1, the process proceeds to step 119 as described above. "Step 119" Here, the counting operation of the internal timer is stopped and the internal timer is reset. And
Go to step 120. "Step 120" It is determined whether or not the switch 32 is turned on, and if it is turned on, it is determined that the camera is released, and the process proceeds to step 121. Otherwise, step 1
Return to 05. [Step 121] The AF / AE control circuit 37 is operated to perform a shooting operation such as an exposure operation by focusing the shooting lens L and opening / closing a shutter. "Step 122" It is determined whether there is a remaining frame of the film 2a by comparing the specified number of sheets with the number of releases, and if there is, the process proceeds to step 123. If not, that is, the photographing of the specified number of frames is completed. If so, the process proceeds to step 126. "Step 123" The film feeding drive circuit 35 is operated to start winding one frame of the film 2a. [Step 124] Information such as shutter speed, aperture value, and the like is written to the magnetic storage portion of the film 2a being wound by the magnetic head 5 via the magnetic head drive circuit 36. "Step 125" Whether or not the winding of one frame is completed is determined by a known means, for example, a method of detecting the rotation amount of a sprocket (not shown) or counting the perforation of the film by a photo sensor. If not completed, the process returns to step 123. When it is determined that the film 2a is finished, the film 2a is stopped from being fed through the film feeding drive circuit 36, and the process returns to step 120.

If it is determined in step 122 that the shooting of the specified number of frames has been completed, the process proceeds to step 126 as described above. "Step 126" Film feeding drive circuit Step 3
6 is operated to start the rewinding of the film 2a. [Step 127] Information such as shutter speed and aperture value is written into the magnetic memory portion of the film 2a being rewound by the magnetic head 5 through the magnetic head drive circuit 36. That is, the writing of information to the last frame is performed when the film is rewound. "Step 128" Whether or not the film rewinding is completed is determined by a known means, and when it is completed, a series of operations is completed.

Here, the known means in step 128 is that the film rewinding time is counted to be a predetermined time or more, and whether the film is outside the film cartridge by a photo sensor or the like. There are methods such as detection.

As a method of writing information such as the number of frames to be photographed and shutter speed at the time of rewinding on the way, there is also a method in which a film cartridge is provided with a memory and is electrically recorded. The recording method does not limit the present invention in any way.

FIGS. 9 to 11 show the second embodiment of the present invention, which is applicable to the case where a film having no magnetic memory portion is used. The same parts as those in the first embodiment are designated by the same reference numerals.

In FIG. 9, 38 is a roller which is pressed against the film 2a and is rotatably attached to a main body (not shown), which is rotated by frictional force as the film runs. Four
Reference numeral 0 denotes a pulse disk fixed to the shaft 39 fixed to the roller 3, in which the non-transparent portions 40a and the transparent portions 40b are alternately formed at a constant angle and rotate integrally with the roller 38. Is configured. Reference numeral 41 is a photosensor for detecting the non-transparent portion 40a and the transparent portion 40b of the pulse disk 40.

FIG. 10 is a diagram showing a circuit block of a camera according to the second embodiment of the present invention, in which the photosensor 41 is driven to count the bright and dark signals accompanying the rotation of the pulse disk 40, This is an encoder circuit for detecting the rotation amount of the pulse disk 40, that is, the running amount of the film 2a. Others are the same as those in the first embodiment.

In this second embodiment, the film information,
The prescribed number of frames of the film, the ISO speed, etc. are input manually, for example, or by a method such as reading DX information provided in the film cartridge 2 with an electric contact piece.

FIG. 11 is a flow chart showing the operation of the control circuit 31 shown in FIG. 10. The same parts as those in the first embodiment are designated by the same step numbers, and only different parts will be described here. . [Step 110-1] The encoder circuit 42 is driven simultaneously with the start of the rewinding of the film 2a, and the rotation amount of the pulse disk 40, that is, the feeding amount of the film 2a is counted. [Step 112] Whether or not the rewinding of the film 2a into the film cartridge 2 is completed is determined by a known means, and if it is determined to be completed, the encoder circuit 42 is used.
The film feed amount detected via the is stored.

After starting film winding in step 116, the process proceeds to step 116-1. "Step 116-1" The encoder circuit 42 is driven at the same time when the film feeding is started, and the film 2a is rolled by the roller 38.
I will count the number of feeds after passing through. [Step 118] When the film feed amount stored in step 110-1 is reached, it is determined that the next frame of the shooting frame at the time of midway rewinding can be found at the aperture of the next frame, and the film feeding drive circuit 35 is used to feed the film. Sending mode
Stop the data 11.

12 to 16 show a third embodiment of the present invention.

12 to 14, reference numeral 43 denotes a camera body of a camera in which the lens can be removed. 44a-44e
Is an electric contact piece, which comes into contact with a contact piece of a photographing lens described later, and information such as an aperture value between the camera body 43 and the photographing lens.
It is for exchanging information such as focal length. Four
Reference numeral 5 is a signal pin attached to the camera body 43 so as to be able to move forward and backward, and 46 is a compression spring, which acts between the room portion 43a provided in the camera body 43 and the flange portion 45b of the signal pin 45, and is indicated by an arrow in FIG. The signal pin 45 is biased in the E direction.

Reference numeral 47 is a switch, and the contact piece 47a is in a position where it can contact the end portion 45c of the signal pin 45, and a photographing lens described later is not attached to the camera body 43.
In this state, the contact pieces 47a and 47b are in a conductive state. 48 is a camera body 4 by a known bayonet mechanism.
A photography lens, 49a, which can be attached to and detached from No. 3
˜49e are electrical contact pieces that can contact the above-mentioned electrical contact pieces 44a to 44e. 50 is the camera body 4 of the taking lens 48
3 is a contact surface that can contact the signal pin 45 when it is attached to the connector 3.

When the taking lens 48 is attached to the camera body 43 in the above structure, the abutting surface 5 as shown in FIG.
By 0, the signal pin 45 is moved in the direction opposite to the arrow E against the biasing force of the spring 46, whereby the contact piece 47a of the switch 47 is deformed by the end face 45c, and the contact pieces 47a and 47b are not conducted. It becomes a state. That is, the switch 47 is turned off when the taking lens is attached and turned on when the taking lens is detached.

FIG. 15 is a diagram showing a circuit block of a camera according to the third embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals.

FIG. 16 is a flow chart showing the operation of the control circuit 31 shown in FIG. 15. The same parts as those in the first embodiment are designated by the same step numbers, and only different parts will be explained here. . “Step 105-A” When the switch 47 is ON, that is, when the taking lens 48 is removed from the camera body 43, the process proceeds to step 110.

Further, in step 113, the film 2
When the rewinding of a is stopped, the process proceeds to step 115-A. “Step 115-A” When the switch 47 is OFF, that is, when the taking lens 48 is attached to the camera body 43, the process proceeds to step 116.

In each of the above embodiments, according to the first and second embodiments, when the camera is left unused for a long time, the film 2a is replaced with the film cartridge 2.
Since the film is rewound inside, the user can
The film 2a is not exposed even if the back lid of the camera is opened carelessly by forgetting that is still loaded in the camera. Further, even if the camera is left in a bright place for a long time, the film is not exposed by the light slightly passing through the exterior cover 3 of the camera.

Further, in the third embodiment, the taking lens 48
Film 2a in conjunction with removal from the camera body 43 of
Since it was rewound into the film cartridge 2,
Even if the light enters the camera from various angles and leaks to a place where it should have been shielded, although slightly, the film 2a is not exposed.

Further, in any of the embodiments, when the film is rewound midway by switching the camera to the non-shooting mode, the number of shooting frames at that time is stored and the shooting is performed again. When the mode is changed, the film is cued based on the above-mentioned stored value, so that no complicated operation is required and the film is wasted or double exposure is performed. It is possible to continue shooting from the frame next to the stored frame without losing.

(Modifications) In the first to third embodiments, the camera using the extrusion type cartridge is described, but in the case of a normal film cartridge, the rewinding of the film in the middle of the film does not occur at the tip of the film. The same effect can be obtained by stopping the first frame within the range where it is wound around the film winding spool of the camera and at the position where the first frame is stored in the film cartridge.

[0060]

As described above, according to the present invention,
By detecting that the photographing mode has been switched to the non-photographing mode by the mode switching means, the timer means for starting the counting operation and the count value of the timer means reaching a predetermined value, Rewinding instruction means for driving the film feeding means to start the rewinding operation of the film into the film cartridge is provided, and the detection means detects that the taking lens is removed from the camera body. Thus, the rewinding instruction means for driving the film feeding means to start the rewinding operation of the film into the film cartridge is provided, and when the camera is in the non-photographing state, the film is loaded into the film cartridge. I try to rewind it. Therefore, it is possible to prevent the film from being exposed carelessly when the camera is in the non-shooting state.

[Brief description of drawings]

FIG. 1 is a front view of a camera according to a first embodiment of the present invention when a barrier is opened.

FIG. 2 is a front view of the camera according to the second embodiment of the present invention when the barrier is closed.

FIG. 3 is a perspective view showing an internal configuration of a main part of the camera of the first embodiment of the present invention.

FIG. 4 is a perspective view showing a film feeding system of the camera of the first embodiment of the present invention.

5 is a plan view showing a state of film winding of the film feeding system of FIG. 4. FIG.

FIG. 6 is a plan view showing a state of film rewinding of the film feeding system of FIG.

FIG. 7 is a circuit block diagram of the camera of the first embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the control circuit of FIG.

FIG. 9 is a perspective view showing an internal configuration of a main part of a camera according to a second embodiment of the present invention.

FIG. 10 is a circuit block diagram of a camera according to a second embodiment of the present invention.

11 is a flowchart showing the operation of the control circuit of FIG.
It is

FIG. 12 is a perspective view of a camera according to a third embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a state of the camera body side when the taking lens is removed as shown in FIG.

FIG. 14 is a cross-sectional view showing a state in which the taking lens is attached to the camera body from the state of FIG.

FIG. 15 is a circuit block diagram of a camera according to a third embodiment of the present invention.

16 is a flowchart showing the operation of the control circuit of FIG.
It is

[Explanation of sign]

4 barriers 5 magnetic head 7 Count start switch 8 main switch 11 Film feeding motor 31 Control circuit 35 Film feeding drive circuit 38 Roller 40 pulse disk 41 Photo sensor 42 Encoder circuit 45 signal pin 47 switch 48 shooting lens

Claims (4)

[Claims] 1. A mode switching means for switching the state of the camera to a photographing mode which enables a release or a non-photographing mode which prohibits a release, and film feeding. In the camera provided with the film feeding means, the film feeding means drives the film feeding means by switching from the photographing mode to the non-photographing mode by the mode switching means. A camera provided with rewinding instruction means for starting a rewinding operation to the inside. 2. A mode switching means for switching the state of the camera to a photographing mode which enables the release or a non-photographing mode which prohibits the release, and film feeding. In a camera provided with a film feeding means for carrying out, a timer means for starting a counting operation by detecting that the photographing mode is switched to the non-photographing mode by the mode switching means, A camera provided with rewinding instruction means for driving the film feeding means to start the rewinding operation of the film into the film cartridge when the count value of the timer means reaches a predetermined value. . 3. A camera comprising a film feeding means for feeding a film and a detection means for detecting a mounting state of the photographing lens in the camera body, wherein the photographing lens is detached from the camera body by the detection means. A camera provided with rewinding instruction means for driving the film feeding means to start the rewinding operation of the film into the film cartridge when it is detected that the film is fed. 4. A storage means for recording the number of frames to be taken when the film is rewound midway, and when the shooting mode is switched or a shooting lens is attached, the film feeding means is driven to store the memory. 4. A camera according to claim 1, 2 or 3, further comprising a feed control means for performing a cueing operation based on the number of photographed frames stored in the means.