JP2001109048A - Cartridge chamber cover lock device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely lock a cartridge chamber cover and to surely release the lock thereof while reducing the number of parts and preventing a cost from being increased. SOLUTION: This cartridge chamber cover lock device is provided with a lock means 23 setting the cartridge chamber cover in a lock state being the open impossible state when it is displaced to a 1st or a 2nd position by power transmitted from a driving means M driving a film and setting it in a lock release state being the open possible state when it is displaced to a 3rd position, a position detection means 24 detecting that the lock means 23 is displaced to the 3rd position and a restraint means 24 including one part of the detection means 24 as the constituting element so as to restrain the lock means 23 at the 3rd position being the position of the lock release state where the cartridge chamber cover can be opened.

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 lock device for locking a lid of a camera which locks and unlocks a lid of a cartridge chamber for opening and closing a cartridge chamber in which a film cartridge is loaded.

[0002]

2. Description of the Related Art Conventionally, in a state where a film is pulled out from a film cartridge loaded in a cartridge chamber of a camera, a cartridge chamber lid is opened because a user erroneously manually operates a cartridge chamber lid opening member. Various cameras having a safety function for preventing a film being photographed from being exposed and wasting valuable photographed film have been proposed. That is, in a case where the film may be damaged if the cartridge chamber lid is opened, even if the user erroneously opens the cartridge chamber lid opening member, the unlocking of the cartridge chamber lid is disabled. Various cameras having a lock mechanism have been conventionally proposed.

For example, as a lock mechanism having a general safety function, a lock member that frictionally contacts a part of a gear that is rotated by a driving force of a feed motor that feeds a film includes a lock member of the feed motor. With the friction force by the driving force,
The feed motor moves to the lock position during the winding rotation,
There is a known structure that moves to an unlock position by rewinding rotation.

However, in the lock mechanism having the above-mentioned structure, the lock state is established only during the winding rotation of the feed motor, and the unlock state is established during the rewind rotation. When the lid is opened, the cartridge chamber lid is opened during rewinding, and the film being photographed is exposed to light, and valuable film may be wasted. In the case of a camera having a function of displaying the state of use of a film, the display may be inaccurate.

Further, in Japanese Patent Application Laid-Open No. 8-286245, a lock member brought into frictional contact with a part of a gear that is rotated by a driving force of a feeding motor is driven by a frictional force generated by the driving force of the feeding motor. The first lock position or the second lock position is determined by the winding and rewinding rotation of the feed motor, respectively.
By moving to the lock position, it will be in the locked state,
There is disclosed a cartridge chamber lid lock mechanism that is unlocked at a position intermediate between the first lock position and the second lock position. In this lock mechanism, the cartridge chamber lid is in a locked state both during the winding rotation and the rewinding rotation of the feeding motor, so that the cartridge chamber lid is erroneously opened even when the user opens the cartridge chamber lid during rewinding. Never open.

In this lock mechanism, since the feed motor is locked even during the rewind rotation of the feed motor as described above,
At the time of unlocking, it is necessary to rotate the feed motor in the winding direction by a fixed amount after the completion of rewinding, and to move the lock member to the intermediate position which is the unlocked position. Since the rotation of the feed motor is used in this manner, the winding fork also causes the fork for driving the cartridge spool to be wound and rotated, and depending on the amount of winding rotation, the film that has been rewound may come out of the cartridge again. May be lost. Therefore, this lock mechanism has a structure in which a member for transmitting the rotation of the feed motor has a certain amount of play, and the rotation force is not transmitted unless the member rotates by a certain amount. Thus, even if the winding rotation for unlocking is performed, the lock member is moved to the unlock position and the fork is not moved if the rotation amount is a certain fixed amount.

[0007]

However, even in a configuration in which the transmission mechanism for transmitting the power of the feed motor has play, if the winding mechanism rotates more than the play amount,
The fork will wind up and rotate. For this reason, even if the play amount of the transmission mechanism is designed to be small, means for surely moving the lock member to the unlock position, and further, to reduce the number of parts and reduce costs, the transmission mechanism is provided with the play mechanism. There has been a demand for a mechanism that can surely be in an unlocked state without having a lock.

Further, if a power split device for splitting the driving force of a motor as disclosed in Japanese Patent Application Laid-Open No. 9-230451 is employed for a lock mechanism of a lid of a cartridge chamber of a camera, the power split device is Has a driving unit, a detecting unit, and a locking unit, and serves as a mechanism for operating the lock member of the cartridge chamber lid by detecting the position of the detecting unit. However, this detecting means is composed of, for example, a photoreflector, and the locking means is composed of, for example, a plunger, which complicates the configuration and increases the cost.

(Object of the Invention) An object of the present invention is to provide a camera cartridge lid lock device capable of securely locking or unlocking while reducing the number of parts and preventing an increase in cost. It is.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is a camera cartridge for locking and unlocking a cartridge chamber lid for opening and closing a cartridge chamber in which a film cartridge is loaded. A chamber lid locking device, wherein when the cartridge chamber lid is displaced to a first or second position by power transmission from a driving means for driving a film, the cartridge chamber lid is locked so that it cannot be opened, and the cartridge chamber lid is displaced to a third position. In this case, the lock means for unlocking the cartridge chamber lid to be openable, a position detection means for detecting that the lock means is displaced to the third position, and a part of the position detection means Locking means for locking the locking means at a third position in an unlocked state in which the cartridge chamber lid can be opened, the camera car comprising: It is an ridge chamber lid locking device.

According to another aspect of the present invention, a cartridge chamber lid for opening and closing a cartridge chamber in which a film cartridge is loaded is provided.
A cartridge chamber lid locking device for a camera for unlocking, wherein when the cartridge chamber lid is displaced to a first or second position by power transmission from a driving means for driving a film, the cartridge chamber lid is locked so that it cannot be opened. And a lock means for disengaging the cartridge chamber lid when it is displaced to the third position.
A locking means for locking at a position, and a part of the locking means as a constituent element, wherein the locking means is displaced to the third position which is an unlocked state where the cartridge chamber lid can be opened. And a lock unit for locking the cartridge chamber lid of the camera having position detecting means for detecting.

According to another aspect of the present invention, a cartridge chamber lid for opening and closing a cartridge chamber in which a film cartridge is loaded is provided.
A cartridge chamber lid locking device for releasing a lock, wherein a rotational force of a motor for driving a film in a winding direction or a rewinding direction is transmitted by frictional contact of a gear of a film feeding system, and thereby the first or second rotation is performed. At that time, the cartridge chamber lid is locked so that it cannot be opened, and the rotational force in the winding direction after the completion of film rewinding by the motor is transmitted by frictional contact of the gears of the film feeding system. The lock means is displaced to a third position which is an intermediate position between the first position and the second position, and at this time, the lock means for releasing the cartridge chamber cover to an unlocked state in which the cartridge chamber lid can be opened, and the lock means The switch means that changes state when the third position is reached, and a combination of a part of each of the lock means and the switch means; A locking means for locking the locking means in the third position, and a signal whose state has been changed from the switch means is inputted from the switch means during the driving in the winding direction which is continuously performed after the rewinding by the motor. A camera-chamber lid lock device having a control means for stopping the drive of the motor in the winding direction and causing the locking means to maintain the locking of the locking means at the third position. .

According to another aspect of the present invention, there is provided a camera for locking and unlocking a lid of a cartridge chamber for opening and closing a cartridge chamber in which a film cartridge having a film use status display portion is loaded. The cartridge chamber lid locking device according to claim 1, wherein a driving force is transmitted to a fork for driving the film and the film use state display unit, so that the cartridge is rotated to the first or second position. A lock means for setting the chamber lid to an unlocked state where the chamber lid cannot be opened, and for rotating the cartridge lid to the third position when the chamber lid is rotated to the third position; By rotating the fork in accordance with the rotation of the fork by a rotation angle within a range that does not depart from the display position of the first position, the locking means is moved to the first position. From said second position to a third position in which the cartridge chamber lid locking device for a camera which has a shape to be rotated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a front view of a camera provided with a cartridge chamber lid locking device according to a first embodiment of the present invention, and FIG. 2 is a top view showing the structure of a main part of the camera of FIG.

In these figures, 1 is a camera body, 2
Reference numeral 3 denotes a cartridge chamber lid for opening and closing the cartridge chamber. Reference numeral 3 denotes a film cartridge having a display unit for displaying a use state of the film. Reference numeral 4 denotes a cartridge chamber cover opening / closing knob, and a lever 21 is integrally formed. By sliding the cartridge chamber cover opening / closing knob 4, the cartridge chamber cover 2 can be opened and closed.

Reference numerals 11 to 19 denote film feed gear trains for transmitting the rotation of the feed motor M to the fork. The fork is integrated with the fork gear 10, and transmits the rotation of the feed motor M via the film feed gear trains 11 to 19.
Film feed gear train 11 to be transmitted to the fork gear 10
19, the lock member 23 is in frictional contact with the gear 11, and the rotation of the feed motor M is transmitted to the gear 11, so that the lock member 23 is rotated by the frictional force generated by the rotation of the gear 11. Rotate.

FIG. 3 is a top view of the cartridge chamber lid locking device having the above-described configuration in an initial state.

The locking member 23 has projections 23 at both ends.
a, 23b, which are notches 22 of the rotating member 22.
a, 22b, the rotation of the rotating member 23 is disabled, that is, the cartridge chamber lid 2 is locked so that it cannot be opened and closed. In addition, the lock member 23 is
c, and the projections 24a provided on one of the contact pieces of the switch 24 fall into the notches 23c, so that the projections 23a, 23b of the lock member 23 become the notches 22a of the rotary member 22. , 22b are at the intermediate positions retracted from the respective positions. At this time, the rotation of the rotation member 23 is possible, and the cartridge chamber lid 2 is unlocked so that the cartridge chamber lid 2 can be opened and closed.

In the initial state, the lock member 23 is located at an intermediate position as shown in FIG. At this time, since the rotating member 22 can rotate in the X direction, the lever 2 is operated by operating the cartridge chamber cover opening / closing knob 4.
1 can also move in the X direction, and the cartridge chamber lid 2
Opens.

FIG. 4 is a top view of the feeding motor M during the winding rotation.

The gear 11 rotates in the Y direction by the winding rotation of the feed motor M, and the lock member
Also rotates in the Y direction, and the protrusion 23 a enters the notch 22 a of the rotating member 22. Thereby, the rotation of the rotating member 22 is regulated, and the lever 21 is held in the state of FIG. Therefore, even if the user performs the opening operation of the cartridge chamber lid 2 in this state, the cartridge chamber lid 2 does not open.

FIG. 5 is a top view of the feeding motor M during rewind rotation.

The operation after rewinding the film will be described below with reference to the flowchart of FIG.

When the photographing of the predetermined frame is completed, or when the rewind switch is turned ON, the microcomputer CPU drives the feed motor M in the rewind direction in step # 101. By this rewinding drive, in FIG. 5, the gear 11 rotates in the X direction opposite to the Y direction, the lock member 23 that has come into frictional contact also rotates in the X direction, and the protrusion 23 b Enter 22b. Thereby, the rotation of the rotating member 22 is restricted, and the lever 21 is held in the state of FIG. Therefore, even if the user performs the opening operation of the cartridge chamber lid 2 in this state, the cartridge chamber lid 2 does not open.

Thereafter, the microcomputer CPU proceeds to step # 10.
In step 2, it is determined whether or not the rewinding of the film and the display operation of the film use state have been completed. If it is determined that the operation has been completed, the process proceeds to step # 103, and the driving of the feeding motor M in the rewinding direction is stopped. In the following step # 104, the feed motor M is driven in the winding direction for unlocking. As a result, the lock member 23 starts rotating in the Y direction, and the protrusions 23a and 23b
When the switch 24 is rotated to an intermediate position that does not enter either of the notches 22a and 22b, the protruding portion 24a of the switch 24 falls into the notch 23c of the lock member 23, and the contact piece of the switch 24 is separated (the state shown in FIG. 3). ), Switch 24
Turns off. The microcomputer CPU determines this (switch 2
When the (OFF signal of No. 4) is detected in step # 105, the process proceeds to step # 106, and the driving of the feed motor M in the winding direction is stopped. As a result, the lock member 23 stops at the intermediate position, and the rotation member 22 can rotate in the X direction. When the user performs the opening operation of the cartridge chamber lid 2, the lever 21 also moves in the X direction. Then, the cartridge chamber lid 2 is opened.

Further, when the lock member 23 is unlocked when stopped at the intermediate position, it is necessary to prevent the lock member 23 from deviating from the intermediate position due to rattling of the gears or external vibration. Therefore, the lock member 23 is held at the intermediate position by a click force in which the protrusion 24a of the switch 24 enters the notch 23c of the lock member 23. As a result, the unlocked state is stably maintained.

The above-described embodiment will be briefly described. The lock member 23 brought into frictional contact with a part of the gear 11 in the film feeding gear train by the winding-up rotation of the feeding motor M drives the feeding motor M. It moves to the lock position in FIG. 4 by the frictional force of the force. Similarly, it moves to the lock position in FIG. 5 by the rewind rotation. Also, when unlocking,
The lock member 23 is returned from the lock position shown in FIG. 5 to the position shown in FIG. 3, which is an intermediate position between FIG. 4 and FIG.

In such a configuration, when the lock is released, the winding is rotated by a predetermined amount as described above in order to return to the intermediate position (the position shown in FIG. 3). It is structured to rotate by contact. Therefore, at this time, the fork also rotates by the same amount, so that it is necessary to minimize the winding rotation amount so as not to affect the completed film (rotation angle). The lock member 23 is shaped as shown in FIG. 3 and the like so that the angle is as small as possible.

Although the winding rotation amount at the time of unlocking is small as described above, the fact that the lock member 23 has been moved to the intermediate position can be detected by the switch 24. The control of the minute rotation can be surely performed, and the lock member 23 is moved to the position shown in FIG.
Can be stopped at the intermediate position shown in FIG.

In the unlocked state, it is necessary to keep the lock member 23 stopped at the intermediate position. Therefore, when the lock member 23 rotates to the neutral position,
The protruding portion 24 a formed on one contact piece of the switch 24 falls into the notch 23 c of the lock member 23. That is, the locking of the lock member 23 is constituted by one contact piece of the switch 24 and the cutout 23 c of the lock member 23. Thereby, the unlocked state is stably maintained at the time of unlocking. Therefore, the lock member does not deviate from the intermediate position due to rattling of the gear, external vibration, or the like.

As described above, even if a play mechanism is not added to the mechanism for transmitting the rotation of the feed motor M to the lock member 23, it is possible to control the minute winding rotation at the time of unlocking. As a result, the apparatus is simpler than in the related art, and the cost can be prevented from increasing.

Further, the means for locking the lock member 23 at the intermediate position includes a part of the components of the switch 24 which is a means for detecting that the lock member 23 has moved (displaced) to the intermediate position, and the lock member. 23, the cut-out portion 23c is provided integrally with the cut-out portion 23.
The apparatus can be simplified and the cost can be reduced.

Further, the lock member 23 can be moved to the intermediate position by a minute winding rotation amount as described above, and this minute rotation amount is a range which does not affect the display of the rewinded film and the film use status. Since the rotation amount is within the range, even if the lock member 23 is moved to the intermediate position, there is no adverse effect on the photographic film.

(Second Embodiment) FIG. 7 is a view showing a cartridge chamber lid locking device according to a second embodiment of the present invention, and a portion having the same function as that of the first embodiment described above. Are denoted by the same reference numerals.

One contact piece of the switch 24 is the lock member 2
3 and an insulator 31 and a lock member 23.
A spring 32 for pressing the switch 24 and a holding plate 33 for holding the spring are provided. The lock member 23 is made of metal, the lock member 23 rotates, and the insulator 3
No electrical signal is detected when the switch 24 rides on 1. When the protrusions 23a and 23b of the lock member 23 rotate to an intermediate position that does not enter either of the cutouts 22a and 22b of the rotating member 22, the protrusion 2
The switch 24 sends a signal to the microcomputer CPU that controls the feed motor M, as in the first embodiment, when 4a falls into the notch 23c of the lock member 23.
As a result, the rotation of the feed motor M stops, and the lock member 23 stops at the intermediate position.

As described above, in both the first embodiment and the second embodiment, the mechanism composed of the lock member 23 and the switch 24 has a function of sending an electric signal to the feed motor, It has a holding function of holding the lock member 23 at the intermediate position by force. Therefore, it is effective in reducing the number of parts.

Further, since the minute rotation of the gear 11 can be controlled by using the electric switch, after the rewinding of the film and the displaying operation of the film use state are completed, the gear 11 is wound up for releasing the lock. The amount is extremely small, and even if the winding rotation is transmitted to the fork gear 10, the amount of rotation of the fork gear 10 is minutely controlled so as not to affect the film that has been rewound and the display of the film use status. If you do, no problem will occur. Further, in this structure, it is not necessary to insert a play mechanism between the film feeding gear trains 11 to 19 for transmitting the driving force of the feeding motor M.

As described above, the cartridge chamber lid locking mechanism can be constructed by adding only a few components to the film feeding system, which is effective in reducing costs.

[0040]

As described above, according to the present invention,
An object of the present invention is to provide a camera cartridge lid locking device capable of securely locking or unlocking while reducing the number of components and preventing an increase in cost.

[Brief description of the drawings]

FIG. 1 is a front view showing a camera provided with a cartridge chamber lid locking device according to a first embodiment of the present invention.

FIG. 2 is a top view showing a structure of a main part of the camera of FIG. 1;

FIG. 3 is a top view showing the cartridge chamber lid locking device in an initial state according to the first embodiment of the present invention.

FIG. 4 is a top view showing the cartridge chamber lid locking device at the time of winding-up rotation of the feed motor in the first embodiment of the present invention.

FIG. 5 is a top view showing the cartridge chamber lid locking device during the rewind rotation of the feed motor according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of a main part in the first embodiment of the present invention.

FIG. 7 is a top view showing an initial state of a cartridge chamber lid locking device provided in a camera according to a second embodiment of the present invention.

[Explanation of symbols]

 2 Cartridge chamber lid 3 Film cartridge 4 Cartridge release knob 10 Fork gear 11 to 19 Film feeding gear train 21 Lever 22 Rotating member 22a, 22b Notch portion 23 Lock member 23a, 23b Projection portion 23c Cutout portion 24 Switch 24a Projection portion 31 Insulator 32 Spring 33 Holding plate M Feed motor CPU Microcomputer

Claims (8)

[Claims] An apparatus for locking and unlocking a lid of a cartridge chamber for opening and closing a cartridge chamber in which a film cartridge is loaded, wherein the first lid is driven by power transmitted from a driving means for driving the film. Or a lock means for setting the cartridge chamber lid to an unlockable lock state when displaced to the second position, and setting the cartridge chamber lid to an unlockable state for opening the cartridge chamber lid when displaced to the third position; A third position detecting means for detecting that the locking means has been displaced to the third position; and a third unlocked state which includes a part of the position detecting means as a component and is capable of opening the cartridge chamber lid. Locking means for locking the locking means at a position. 2. A cartridge chamber lid locking device for a camera for locking and unlocking a cartridge chamber lid for opening and closing a cartridge chamber in which a film cartridge is loaded, wherein a first power is transmitted by a driving means for driving a film. Or a lock means for setting the cartridge chamber lid to an unlockable lock state when displaced to the second position, and setting the cartridge chamber lid to an unlockable state for opening the cartridge chamber lid when displaced to the third position; A third locking means for locking the locking means in the third position, and a third unlocking state including a part of the locking means as a constituent element, wherein the locking means is in an unlocked state in which a cartridge chamber lid can be opened. And a position detecting means for detecting that the cartridge has been displaced to the position of (1). 3. The apparatus according to claim 1, further comprising control means for controlling the driving means based on a detection signal from the position detecting means. 4. The apparatus according to claim 1, wherein the control unit is configured to perform a winding operation that is performed after the rewinding operation of the driving unit is completed.
When a detection signal is input from the position detecting means, the winding drive of the driving means is stopped, and the locking means maintains the locking of the locking means at the third position. 4. The locking device according to claim 3, wherein the cartridge chamber lid is locked. 5. The method according to claim 1, wherein the position detecting means is configured to detect when the locking means is displaced to the first or second position and when the third means is located between the first position and the second position. 5. A device according to claim 1, wherein said switch means changes its state when it is displaced to said position. 6. The apparatus according to claim 1, wherein said lock means is brought into frictional contact with a gear of a film feeding system, and is displaced to a first, second or third position by frictional force of said drive means. 6. A device for locking a cartridge chamber lid of a camera according to any one of claims 5 to 5. 7. A cartridge chamber lid locking device for locking and unlocking a cartridge chamber lid for opening and closing a cartridge chamber in which a film cartridge is loaded, wherein a rotating force of a motor for driving the film in a winding direction or a rewinding direction. Is transferred to the first or second position by the frictional contact of the gear of the film feeding system,
At this time, the cartridge chamber lid is locked so that it cannot be opened, and the rotational force in the winding direction after the completion of film rewinding by the motor is transmitted by frictional contact of the gears of the film feeding system, so that the first Locking means for displacing to a third position which is an intermediate position between the position and the second position, in which case the cartridge chamber lid is brought into an unlocked state in which the cartridge chamber lid can be opened, and the locking means is moved to the third position. A switch means that changes state upon reaching, a combination of a part of the lock means and a part of the switch means, a lock means for locking the lock means at the third position, and an end of rewinding by the motor. During the subsequent driving in the winding direction, a signal whose state has been changed is input from the switch means, thereby driving the motor in the winding direction. The stop, camera cartridge chamber lid lock apparatus characterized by a control means for maintaining the engagement with the third position of the locking means to the locking means. 8. A cartridge chamber lid lock device for a camera for locking and unlocking a cartridge chamber lid for opening and closing a cartridge chamber in which a film cartridge having a film usage status display portion is loaded, wherein the film and the film usage status are provided. When the driving force is transmitted to the fork for driving the display unit, the cartridge chamber lid is locked so as not to be opened when the cartridge is rotated to the first or second position, and is rotated to the third position. A locking means for releasing the cartridge chamber cover when the apparatus is in operation, and for unlocking the fork by a rotation angle within a range in which the film use state display section does not separate from a predetermined display position. , The lock means is shaped to rotate from the first or second position to the third position. A cartridge chamber lid locking device for a camera.