JPH10133262A - Light shielding door opening/closing mechanism for film cartridge and control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To load a film cartridge, without damaging an opening/closing member or a light shielding door driving shaft, even if a light shielding door is in an erroneously opened state by stopping the light shielding door driving shaft at a loading standby position. SOLUTION: The light shielding door driving shaft 22 is stopped at a rotational position (standby position) where the rotation angle of the light shielding door driving shaft 22 standing by at the time of loading the film cartridge 10 is a little before that of the driving shaft 22 for closing the cartridge light shielding door 28. This standby position is of a position where a light shielding door opening/closing member 30 follows the driving shaft 22, to be engaged therewith, even if the film cartridge 10 is loaded in the opened state of the cartridge light shielding door 28. Even if the film cartridge 10 is pushed into a cartridge chamber, in the erroneously opened state of the light shielding door 28, the light shielding door opening/closing member 30 follows the driving shaft 22, to be engaged therewith, so that the opening/closing member 30 or the driving shaft 22 can not be damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a light-shielding door opening / closing mechanism of a film cartridge in a camera, a lab machine, a film image reproducing apparatus, etc. corresponding to a new system film and a light-shielding door opening / closing mechanism for implementing the method. About.

[0002]

2. Description of the Related Art FIG. 10 shows a film image reproducing apparatus, and is an enlarged perspective view showing a state where a film cartridge 10 is loaded in a cartridge chamber 2A of an apparatus housing 2. A lid 4 is attached to the device housing 2 via a hinge 6 so as to be freely opened and closed. A cartridge attitude holding member 4A protrudes inside the lid 4, and a claw 4B is formed on the inner upper edge.

In the cartridge chamber 2A of the apparatus housing 2, a lock lever 12 is provided rotatably about a shaft 14 as a fulcrum. The lock lever 12 is biased in the closing direction (the direction of the arrow in FIG. 10) by the biasing force of the spring 16 so that the claw 12A at the distal end is biased. An unlocking lever 18 is disposed close to the bent end 12B of the lock lever 12. The lock release lever 18 is moved downward in FIG.
When B is pressed and the lock lever 12 is rotated in the opening direction (the direction opposite to the arrow in FIG. 10), the lid 4 is unlocked and the lid 4 is opened as shown in the figure. The lock release lever 18 is driven by a driving force transmission mechanism 20 described later.

[0004] In the cartridge chamber 2A of the apparatus 2,
A light-shielding door drive shaft 22 and a spool drive shaft 24 are provided. The light-shielding door drive shaft 22 and the spool drive shaft 24 are driven by a drive force transmission mechanism 20 described later. As shown in FIG.
Has a single spool 26, a cartridge light shielding door 28, and a light shielding door opening / closing member 30. The cartridge light-shielding door 28 is connected to a light-shielding door opening / closing member 30, and is opened and closed by the turning operation of the light-shielding door opening / closing member 30.

In FIG. 10, a film cartridge 1
0 means that the film cartridge 10
Is loaded into the cartridge chamber 2A, and the cover 4 is closed.
And the spool 26 is held between the spool drive shaft 24 and the posture thereof is maintained. The claw 4B of the lid 4 is engaged with the claw 12A of the lock lever 12, whereby the lid 4 is locked in a closed state.

When the film cartridge 10 is loaded, the light-shielding door opening / closing member 30 is engaged with the light-shielding door drive shaft 22. Then, the power of the driving force transmission mechanism 20 is transmitted to the cartridge light shielding door 28 via the light shielding door drive shaft 22 and the light shielding door opening / closing member 30, whereby the cartridge light shielding door 28 is opened and closed. When the film is used, the spool 26 is rotated by the power from the driving force transmission mechanism 20. As a result, the film is fed from the film cartridge 10.

FIG. 11 shows an example of a conventional driving force transmission mechanism 20. The driving force transmission mechanism 20 shown in FIG. 1 includes a lever (first power transmission member) 32, a turning piece (second power transmission member) 34, a torsion coil spring (biasing member) 36, and the like. ing. The lever 32 has a sector gear 32
A is formed, and a motor-side gear (not shown) is meshed with the sector gear 32A. When the driving force is transmitted from the motor, the lever 32 is reciprocated in the range of θ ° in FIG.

The turning piece 34 has a U-shaped engaging groove 34A.
Is formed in the engaging groove 34A.
Is engaged, the turning piece 34 is turned. This turning piece 34 is urged to one side of the torsion coil spring 36,
Normally, one stopper (not shown) is used as shown in FIG.
It is positioned at one moving end position (light shielding door closing position) shown in FIG. In FIG. 11A, the lever 32
When the is rotated in the counterclockwise direction, the claw 32B is engaged with the engagement groove 34A as shown in FIG. 11B, and the rotating piece 34 is biased by the torsion coil spring 36. Begins to rotate counterclockwise against And the lever 32 is θ1
When rotated, the biasing force of the torsion coil spring 36 switches to the other moving end direction side, and the torsion coil spring 3
11 (C) by the urging force of No. 6 and the other stopper (not shown).

The lever 32 is engaged with the lock release lever 18 (third power transmission member) after the engagement with the turning piece 34 is released. This lock release lever 1
8 is driven by the rotation of the lever 32 shown in FIG. That is, the driving force transmission mechanism rotates the turning piece 34 within the range of θ1 ° of the entire turning range θ of the lever 32.
And the lock release lever 18 is driven in the remaining range of θ2 °.

[0010]

By the way, in the above-mentioned conventional film image reproducing apparatus, the film cartridge 10
When the cartridge is accommodated in the cartridge chamber 2A, the light-shielding door drive shaft 22 is on standby at one of the moving end positions of the turning pieces 34 (light-shielding door closing position). And the film cartridge 1
When 0 is accommodated in the cartridge chamber 2A, a hole (not shown) of the light shielding door opening / closing member 30 of the film cartridge 10 is engaged with the light shielding door drive shaft 22.

However, at this time, when the film cartridge 10 is loaded into the cartridge chamber 2A with the light shielding door 28 of the film cartridge 10 opened, the light shielding door driving unit which is waiting at the closed position with the opening of the opening / closing member 30 is opened. Since the position of the shaft 22 is greatly shifted, the hole of the opening / closing member 30 abuts against the light-shielding door drive shaft 22 and the opening / closing member 30
Alternatively, the light-shielding door drive shaft 22 may be damaged.

The present invention has been made in view of such circumstances, and even if the film cartridge is pushed into the cartridge chamber with the light blocking door of the film cartridge opened accidentally, the opening / closing member or the light blocking door drive shaft is damaged. It is an object of the present invention to provide a light-shielding door opening / closing mechanism and a control method for a film cartridge which allows a film cartridge to be loaded without performing.

[0013]

According to the present invention, in order to achieve the above object, a light-shielding door drive shaft is engaged with a light-shielding door opening and closing member of a film cartridge. A method for controlling a light-shielding door of a film cartridge, which opens and closes the light-shielding door by rotating the light-shielding door drive shaft to a closed position or an open position of the light-shielding door, wherein the light-shielding door drive shaft is moved to the light-shielding door when the film cartridge is loaded. The light-shielding door drive shaft is stopped at the film cartridge loading standby position set between the closing position and the opening position to receive the film cartridge, and when the film cartridge is discharged, the light-shielding door drive shaft is closed by closing the light shielding door. The film cartridge is driven to the position to discharge the film cartridge.

According to the method for controlling the light-shielding door of the film cartridge of the present invention, the light-shielding door is in the closed state because the light-shielding door drive shaft is waiting at the loading standby position before the closing position of the light-shielding door. Even if a film cartridge that has not been inserted is pushed into the cartridge chamber, the opening and closing member is smoothly fitted to the light-shielding door drive shaft. Further, in order to achieve the above object, a light shielding door opening / closing mechanism for implementing the control method of the present invention has a first engagement portion, and a first power transmission member which is rotated by power from a drive source. A light-shielding door drive shaft engaged with the light-shielding door opening / closing member of the film cartridge, and an open position and a closed position for opening and closing the light-shielding door of the film cartridge around the light-shielding door drive shaft, respectively. A second power transmission member that rotates between the first power transmission member and a second engagement portion that removably engages with the first engagement portion within a predetermined rotation range of the first power transmission member. Have
A second power transmission member to which rotational driving force is transmitted from the first engagement portion via the second engagement portion, and the second power transmission member according to a moving position of the second power transmission member A biasing member for biasing the transmission member in a bistable manner toward one of the moving ends that is the opening position of the light shielding door or the other moving end that is the closing position of the light shielding door. A door opening / closing mechanism, wherein a restricting member for restricting rotation of the second power transmitting member is formed on the first power transmitting member, and the restricting member includes a first power transmitting member and a second power transmitting member. Restricting the rotation of the second power transmission member against the urging force of the urging member in a predetermined section before the closing position of the light shielding door by a relative rotation position with respect to the power transmission member. It is characterized by. In the present invention, since the rotation of the second power transmission member is stopped in a predetermined section before the closing position of the light shielding door by the regulating member, the power source for rotating the second power transmission member is driven. Control becomes easy.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a light-shielding door opening / closing mechanism for a film cartridge according to the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, components corresponding to the above-mentioned conventional components are denoted by the same reference numerals. FIG. 1 shows a part of a film cartridge 10 and a driving force transmission mechanism 20. The driving force transmission mechanism 20 includes a motor 38, a lever 32, and a turning piece 3 as shown in FIG.
4, a torsion coil spring 36 and the like.

A rotary plate 40 is fixed to a spindle 38A of the motor 38, and a gear 40A is formed on the rotary plate 40 in the range of θ °. An intermediate gear 42 is engaged with the gear 40A, and a gear 44 fixed coaxially with the gear 42 is engaged with the sector gear 32A of the lever 32. Therefore, when the motor 38 is driven in the counterclockwise direction in FIG. 2, the driving force is transmitted to the lever 32 via the gears 40A, 42, 44, and 32A. Rotate in the range shown in FIG.

FIG. 6 is an explanatory view of the lever 32. FIG. 6 (A) is a top view, FIG. 6 (B) is a side sectional view, and FIG. 6 (C).
Is a bottom view. As shown in these figures, the lever 32
Is provided with a through hole 32C at a substantially central portion thereof.
It is supported by a shaft 46 (see FIG. 2) inserted through 2C. A cam groove 48 is formed on the surface of the lever 32. One end of the lock release lever 18 is engaged with the cam groove 48. The cam groove 48 is formed by an arc-shaped cam groove 48A indicated by a range A formed around the shaft 46 and a deformed cam groove 48B indicated by a range B. Therefore, the lock release lever 18 does not rotate in the rotation range of the lever 32 indicated by the range A, and is engaged with the cam groove 48B and rotates in the rotation range of the lever 32 indicated by the range B. At this time, when the lock release lever 18 is rotated, the end 18A presses the end 12A of the lock lever 12, so that the lid 4 is opened as shown in FIG.

In FIG. 6B, the above-mentioned claw 32B is protruded from the end of the lever 32. This nail 32B
Is engaged with the U-shaped groove 34A of the rotating piece 34 described above. The engagement operation between the claw 32B and the groove 34A will be described later. Also, in FIG. 6C, a deformed ridge 52 is formed on the bottom surface of the lever 32. FIG.
As shown in FIG. 5, a pin 54 protruding from the turning piece 34 is provided.
The operation of the projection 52 and the pin 54 will be described later.

In FIG. 6C, the lever 32
A cam 56 is formed to project from the peripheral edge of the cam. This cam 5
6 comes into contact with the pin 54 of the above-mentioned turning piece 34, and the torsion coil spring 36
In order to prevent the biasing force of the torsion coil spring 36 from reaching the rotating piece 34 during that time.
Arc-shaped cam surface 56A concentric with through-hole 32C of lever 32
have. The engagement operation between the cam 56 and the pin 54 will be described later.

FIG. 7 is an explanatory view of the turning piece 34, and FIG.
Is a top view and FIG. 7B is a side view. As shown in these drawings, the U-shaped groove 34 </ b> A and the pin 54 described above are formed in the rotating piece 34. As shown in FIG. 7 (A), the turning piece 34 has a through hole 34B substantially at the center thereof. The through-hole 34B is fitted with the light-shielding door drive shaft 22, and when the turning piece 34 is turned in the direction of arrow A in FIG. Is closed. Conversely, when the turning piece 34 is turned in the direction of arrow B in FIG.
Are turned in the opposite direction to open the cartridge light shielding door 28.

The turning piece 34 is urged toward one moving end shown in FIG. 2 or the other moving end shown in FIG. 5 by the urging force of the torsion coil spring 36 described above. , Are stably positioned at their moving end positions by respective stoppers not shown. One end of the torsion coil spring 36 is locked to the pin 54 of the turning piece 34, and the other end is locked to a fixing pin 58 on the apparatus body side.

Next, the operation of the driving force transmission mechanism 20 configured as described above will be described. The operation of the driving force transmission mechanism 20 shown in FIG. 2 to FIG. 5 is an operation of first closing the cartridge light shielding door 28 and then opening the lid 4 of the cartridge chamber 2A. The operation will be described first. First, the film is transferred to the spool 2 of the film cartridge 10.
6, the motor 38 is driven in the counterclockwise direction in the figure from the position shown in FIG. Motor 3
8 are driven by the gears 42A, 44, 46, 3
The rotation is transmitted to the lever 32 via 2A, and the lever 32 starts rotating in the counterclockwise direction in the figure. And lever 3
As shown in FIG. 3, the second claw 32B is
A, and by pushing the groove 34A, the rotating piece 34
Starts to rotate in the counterclockwise direction in FIG. At this time, the turning piece 34 turns against the urging force of the torsion coil spring 36. The biasing force causes the rotating piece 34 to return in the reverse direction (FIG. 2).
(The original position shown in FIG. 3),
As shown in FIGS. 4 and 5, the pin 54 is in contact with the ridge 52 of the lever 32 to restrict the return, so that the pin 54 smoothly rotates without returning.

When the lever 32 rotates to the position shown in FIG. 4, the biasing force of the torsion coil spring 36 switches to the other moving end direction. Therefore, the turning piece 34 is turned at a time toward the other moving end position by the urging force of the switched torsion coil spring 36. However, the pin 54 of the torsional turning piece 34 contacts the cam surface 56A of the cam 56 and stops there. Even in this state, the light shielding door 28 of the film cartridge 10 is closed, but when the lever 32 is further rotated to reach the position shown in FIG. 5, the cam 56 completely escapes from the pin 54. The spring is rotated to the other end position by the urging force of the torsion coil spring 36. The operation of the turning piece 34 causes the light-shielding door drive shaft 22 and the light-shielding door opening / closing part 30 shown in FIG. 1 to rotate in the direction of arrow A in the figure, so that the cartridge light-shielding door 28 is securely closed.

By the way, the lock release lever 18 is not rotated in the rotation range of the lever 32 shown in FIGS. During this time, one end of the lock release lever 18 is
8A, the tip 18A of the lock release lever 18 for sliding.
Is held at a position distant from the end 12A of the lock lever 12, but the pivotal movement of the lever 32 causes one end of the lock release lever 18 to move into the irregularly shaped cam groove 48B shown in FIG. By sliding, the lock release lever 18 is operated to come into contact with the end 12B of the lock lever 12, and the lock lever 12 is operated to open the lid 4.

In the above embodiment, the closing operation of the light shielding door 28 and the opening operation of the lid 4 have been described. However, if the lever 32 is rotated in the order shown in FIGS. A film feeding operation can be performed. In this case as well, the turning piece 34 turns smoothly because the return member is prevented from returning by the regulating member. The lever 32
Engages with the spool drive shaft 24 shown in FIG. 1 after the engagement with the turning piece 34 is released. And lever 32
Rotates the spool 26 via the spool drive shaft 24 in the film feeding direction. As a result, the film is sent out from the film cartridge 10.

By the way, as shown in FIG. 8, the light-shielding door drive shaft 22 has a rotation angle of 209 ° ± 4 from its reference position.
The opening / closing member 30 of the film cartridge 10 is received in the region of the rotation angle 117 ° ± 4 °, and the cartridge light shielding door 28 of the cartridge 10 is opened in the region of the rotation angle 117 ° ± 4 °.
The cartridge light-shielding door 28 of the cartridge 10 is closed in the area of 09 ° ± 4 °, and the film cartridge 10 is discharged.

In the present invention, the rotation angle of the light-shielding door drive shaft 22 for closing the cartridge light-shielding door 28 of the film cartridge 10 corresponds to the rotation angle of the film cartridge 1.
The rotation angle of the light-shielding door drive shaft 22 which is waiting at the time of loading 0 is stopped at the rotation position slightly before (standby position). This standby position is located at the light blocking door 2 of the cartridge.
Even when the film cartridge 10 is loaded in a state where the film cartridge 8 is opened, the light-shielding door opening / closing member 30 of the film cartridge 10 can be engaged with the light-shielding door drive shaft 22 in a position where it can be engaged. In the embodiment of the present invention, the standby position is preferably set to a rotation angle of 206 ° ± 1 ° (hereinafter referred to as B
Mode. ), The closing position when the film cartridge is discharged is a rotation angle of 212 ° ± 1 ° (hereinafter A).
Mode. ), The turning operation of the light shielding door drive shaft 22 is controlled.

An example of the turning operation of the light shielding door drive shaft 22 will be described below with reference to the flowchart of FIG. When the power is turned on (Step 101) and the eject button is operated (Step 102), the lever 32 is rotated in one direction, and the cover 4 of the cartridge chamber 2A is moved to the position shown in FIG.
Is unlocked and the lid 4 is opened (step 10).
3). Subsequently, the lever 32 is rotated in the other direction, and the light shielding door drive shaft 22 is in the B mode position (the rotation angle 2
06 ° ± 1 °), that is, as shown in FIG. 4, the pin 54 of the turning piece 34 is positioned in contact with the cam surface 56A of the cam 56 of the lever 32. When the film cartridge 10 is loaded in the cartridge chamber 2A (Step 104) and confirmed (Step 105), the lever 32 is rotated in one direction, whereby the light-shielding door drive shaft 22 is moved to the A mode position, that is, as shown in FIG. As shown in FIG.
Is rotated to a position where the lever 32 is completely disengaged from the cam 56, and the cartridge light shielding door 28 is once completely closed. When it is confirmed that the lid 4 of the cartridge chamber 2A is closed (step 106), the lever 32 is rotated in the other direction, and the light-shielding door drive shaft 22 is rotated to open the cartridge light-shielding door. (Step 107). This state is a state where the turning piece 34 is turned to one end as shown in FIG. Next, the film is fed out from the film cartridge 10 and is reproduced (step 108). When the reproduction is completed, the eject button is operated (step 109). Then, the film is wound around the film cartridge 10. When it is confirmed that the film has been caught in the film cartridge 10, the lever 32 is rotated in one direction, and the light-shielding door drive shaft 22 passes through the A-mode position, and as shown in FIG. The pin 54 is rotated to a position where it is completely removed from the cam surface 56A of the cam 56 of the lever 32 (step 110), and the lid 4 of the cartridge chamber 2A is opened. When it is confirmed that the lid 4 of the cartridge chamber 2A has been opened (step 111), the lever 32 is rotated in the other direction and returned to the A mode position, where the film cartridge 10 is discharged from the cartridge chamber 2A (step 111). Step 1
12). When it is confirmed that the film cartridge 10 has been discharged from the cartridge chamber 2A, the lever 32 is further rotated in the other direction, and the light-shielding door drive shaft 22
Is rotated in the B mode position, that is, as shown in FIG. 4, the pin 54 of the rotating piece 34 is in contact with the cam surface 56A of the cam 56 of the lever 32. Next, the cover 4 of the cartridge chamber 2A is closed (Step 114). The light-shielding door drive shaft 22 waits at this B-mode position.

The above procedure is merely an example. In the present invention, when the film cartridge 10 is received in the cartridge chamber 2A, the light-shielding door drive shaft 22 waits slightly before the closed position of the light-shielding door 28. When the film cartridge 10 is ejected from the cartridge chamber 2A, the light-shielding door drive shaft 22 is connected to the light-shielding door 28.
Other procedures may be appropriately changed as long as they are held at the closed position.

[0030]

As described above, according to the method for controlling the light-shielding door of the film cartridge according to the present invention, when the film cartridge is received in the cartridge chamber, the light-shielding door drive shaft is moved slightly before the closed position of the light-shielding door. When the film cartridge is pushed into the cartridge chamber with the light blocking door of the film cartridge opened by mistake, the light blocking door opening / closing member engages with the light blocking door drive shaft. Alternatively, there is no risk of damaging the light-shielding door drive shaft.

Further, according to the film cartridge opening / closing mechanism for a film cartridge according to the present invention, the light blocking door drive shaft is blocked by the regulating member by preventing the turning piece from turning within a certain turning range of the lever. , The light-shielding door drive shaft can be easily controlled.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a film cartridge and a driving force transmitting mechanism in a light blocking door opening / closing mechanism of a film cartridge according to the present invention.

FIG. 2 shows a driving force transmission mechanism in the light shielding door opening / closing mechanism of the film cartridge according to the present invention, and shows a state in which the light shielding door is opened.

FIG. 3 shows a driving force transmission mechanism in the light shielding door opening / closing mechanism of the film cartridge according to the present invention, and shows a state in which the light shielding door is being closed.

FIG. 4 shows a driving force transmission mechanism in the light blocking door opening / closing mechanism of the film cartridge according to the present invention, and shows a state slightly before closing the light blocking door.

FIG. 5 shows a driving force transmission mechanism in the light shielding door opening / closing mechanism of the film cartridge according to the present invention, and shows a position where the light shielding door is closed and the lid of the cartridge chamber is unlocked.

FIG. 6 is an explanatory view of a lever constituting a driving force transmission mechanism in the light shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 7 is an explanatory view of a turning piece constituting a driving force transmission mechanism in the light blocking door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 8 is an explanatory diagram showing an opening / closing angle of the light shielding door in the light shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 9 is a flowchart showing an example of control of a light shielding door opening / closing mechanism of the film cartridge according to the present invention.

FIG. 10 is a perspective view showing a film cartridge accommodating portion of the film image reproducing apparatus to which the method for controlling the light shielding door of the film cartridge according to the present invention is applied.

11 is an explanatory diagram conceptually showing a conventional driving force transmission mechanism in the film image reproducing apparatus of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Film cartridge 20 ... Driving force transmission mechanism 22 ... Light shielding door drive shaft 28 ... Cartridge light shielding door 30 ... Light shielding door opening / closing member 32 ... Lever 32B ... Claw 34 ... Rotating piece 34A ... Engaging groove 36 ... Torsion coil spring 54 ... Pin 56 ... Cam 56A ... Cam surface

Claims (4)

[Claims] 1. A film for opening and closing the light shielding door by engaging a light shielding door driving shaft with a light shielding door opening / closing member of a film cartridge and rotating the light shielding door driving shaft to a closed position or an opened position of the light shielding door. In the method for controlling the light shielding door of a cartridge, the light shielding door driving shaft is stopped at a film cartridge loading standby position in which the light shielding door driving shaft is set between the closing position and the opening position of the light shielding door when the film cartridge is loaded. A method for controlling a light shielding door of a film cartridge, comprising: receiving a film cartridge; and driving the light shielding door drive shaft to a closed position of the light shielding door when discharging the film cartridge. 2. The loading standby position of the film cartridge is a position where the light blocking door opening / closing member of the film cartridge is engaged with the light blocking door drive shaft even if the light blocking door of the film cartridge is not closed. 2. The method for controlling a light-shielding door of a film cartridge according to claim 1. 3. The light-shielding door control of a film cartridge according to claim 2, wherein the standby position of the light-shielding door drive shaft is at a rotation angle of 4 to 8 degrees before the closing position of the light-shielding door. Method. 4. A first power transmission member having a first engagement portion and rotated by power from a drive source, and a light-shielding door drive shaft engaged with a light-shielding door opening / closing member of a film cartridge. A second power transmission member that pivots between an open position and a closed position for opening and closing the light-shielding door of the film cartridge around the light-shielding door drive shaft; A second engaging portion detachably engaging the first engaging portion within a predetermined rotation range of the transmission member, and the second engaging portion is provided via the second engaging portion from the first engaging portion. A second power transmission member to which a rotational driving force is transmitted, and one of the moving ends, which is an opening position of the light shielding door, for moving the second power transmission member in accordance with a moving position of the second power transmitting member, or A biasing member for biasing the other end of the light-shielding door in a bistable manner toward the other movable end; A light blocking door opening / closing mechanism for a film cartridge, comprising: a first power transmission member having a restriction member for restricting rotation of the second power transmission member; Due to the relative rotational position of the power transmission member and the second power transmission member, the second power transmission member is opposed to the urging force of the urging member in a predetermined section before the closing position of the light shielding door. A light blocking door opening / closing mechanism for a film cartridge, which restricts rotation of the film cartridge.