JPH0312300B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film cassette ejecting device used in cameras, telecoms, etc.

In recent years, cameras, telecoms, etc. that use cassette-type film have become popular in order to facilitate the attachment and detachment of film. In such cameras, telecoms, etc., it is important that the cassette can be quickly and easily attached and detached. Therefore, we installed an eject device on the above cameras and telecoms, etc.
When removing a cassette held in the cassette storage chamber, a part of the cassette is protruded from the cassette storage chamber by operating an eject button to unlock the cassette, making it easy to remove the cassette. be.

However, conventional ejectors have used a dedicated spring to cause a portion of the cassette to protrude from the cassette storage chamber when the lock is released. This not only increases the number of parts and increases costs, but also complicates assembly work and requires a space for installing the spring in the cassette storage chamber.

This invention was made based on the above-mentioned circumstances, and its purpose is to allow the lock lever that holds the cassette to project the cassette out of the cassette storage chamber when the cassette is unlocked. It is therefore an object of the present invention to provide a film cassette ejecting device which eliminates the need for a special spring for ejecting the cassette.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 11.
This will be explained with reference to the figures. First, FIGS. 1 to 4 show a film cassette 1. As shown in FIG. This cassette 1
A cassette body 5, which is formed by connecting a cylindrical film supply chamber 2 and a winding chamber 3 through a wall 4, is integrally molded of synthetic resin. The cassette main body 5 has the supply chamber 2 and the winding chamber 3.
A plate-shaped bridge 6 that closes the opening at the upper end of the supply chamber 2 connects the claws 7 hanging from the four corners of the lower surface of the bridge to the supply chamber 2.
and a stepped portion 8 protruding from the outer peripheral surface of the upper end of the winding chamber 3.
It is removably connected by being elastically engaged with. An indicator label 9 indicating film performance is attached to the upper surface of the bridge 6, and an information label 10 is provided to the lower surface. Further, on the front surface of the wall 4 of the cassette main body 5, that is, on the film surface 11, a flange 12 having an L-shaped cross section is provided protruding in three directions excluding the lower end of the periphery. Furthermore, the wall 4
As shown in FIG. 8, there is a recess 13 on the upper back side of
is formed. The lower end of the wall 4 slightly protrudes from the lower end surfaces of the supply chamber 2 and the winding chamber 3. Further, as shown in FIG. 4, the winding chamber 3 has a winding shaft 3b whose lower end is rotatably fitted into a cylindrical receiving part 3a protruding from the inner bottom.
is provided. Further, 3c in the figure is a telemp.

The camera 14 into which the cassette 1 thus constructed is loaded is shown in FIGS. 5 and 6. That is, numeral 15 in the figure is a camera body having a substantially rectangular box shape. This camera body 15 includes
A cassette storage chamber 16 is formed in which a part of the upper surface thereof is opened over the entire width direction. A mask portion 18 forming a mask surface 17 is provided in a protruding manner at the center portion of the cassette storage chamber 16 in the width direction. This mask portion 18 has an engagement groove 19 formed on its upper surface and both side surfaces in which a collar 12 protruding from the film surface 11 of the cassette 1 engages, and further has an information label 10 of the cassette 1 on the upper surface. A detector 20 for detecting information is provided.

Further, a bottom groove 21 is formed in the bottom of the cassette storage chamber 16 in contact with the mask surface 17, and behind the bottom groove 21, a lock lever 22 made of an elastic material is attached to the lower end of the cassette storage chamber 16 with a stepped screw 23. The camera body 15 is supported by the camera body 15 so as to be swingable in the front-back direction of the camera body 15, and is biased rearward by a spring 24. A lock engaging portion 25 and a cassette receiving portion 26 are respectively formed at the upper and lower end portions of the lock lever 22 by bending a portion thereof at a substantially right angle. It protrudes into the groove 21. In addition, lock lever 2
The upper end of 2 is connected to an ejector button 27 provided on the upper surface of the camera body 15 so as to be slidable in the front-back direction. Therefore, by sliding the ejector button 27, the lock lever 22 can be swung. Further, the cassette storage chamber 16 is provided with a contact piece 28 which, together with the lock lever 22, constitutes a switch for the circuit of a motor (not shown) for winding the film. The above-mentioned circuit is closed by contacting the contact piece 28, and thereby the first idle winding is performed. In addition, the camera body 15
There is a lid 2 on the top surface that can be slid freely in the front and rear directions.
9 is provided, and the opening of the cassette storage chamber 16 can be closed with this lid 29.

On the other hand, a cylindrical body 31 holding a lens 30 is screwed onto the front surface of the camera body 15 so as to face the mask surface 17 . This cylinder 31 and mask surface 1
A reflective mirror 32 is rotatably provided between the mirror 7 and the mirror 7. This reflecting mirror 32 is normally held at an angle of about 45 degrees, and is designed to be brought down by a release operation. When the reflecting mirror 32 is at 45 degrees, the prism 33
A viewfinder 35 provided on the rear surface of the camera body 15 is located in the optical path direction of the prism 33 via an eyepiece lens 34.

Next, the cassette storage chamber 16 of the camera body 15
The procedure for loading cassette 1 will now be explained. first,
As shown in FIG. 7, the flange 12 formed on the wall 4 of the cassette 1 is engaged with the engagement groove 19 formed on the mask portion 18 of the camera body 15, and the cassette 1 is pushed into the cassette storage chamber 16. Then, as shown in FIG. 8, the lower end of the wall 4 touches the lock lever 22.
Bottom groove 2 of the cassette receiving part 26 formed at the lower end of the
1, and the lock lever 22 rotates forward against the biasing force of the spring 24 using the step screw 23 as a fulcrum. As the lock lever 22 rotates forward, the lock engaging portion 25 comes into contact with the upper back surface of the wall 4. When the cassette 1 is further pushed in from this state, the lock lever 22 is elastically deformed so as to deflect backward. In other words, the cassette receiving portion 26 of the lock lever 22 and the lock engaging portion 2
There is a gap between 5 and 5. Therefore, as shown in FIG. 10, the lock engaging portion 25 engages with the recess 13 formed on the back surface of the wall 4, and the lower end of the wall 4 enters the bottom groove 21. Further, at this time, the lock lever 22 rotates further forward and comes into contact with the contact piece 28, so that a motor (not shown) is operated and the first idle winding is performed. The ejector button 27 slides forward of the camera body 15 in conjunction with the rotation of the lock lever 22.

That is, according to the above structure, in the cassette 1, the lock engaging portion 25 of the lock lever 22 is connected to the wall 4.
By engaging with the recess 13 of the mask part 18, the film surface 11 of the cassette 1 is securely held in the cassette storage chamber 16, and the flange 12 of the cassette 1 is engaged with the engaging part formed on the upper surface and both side surfaces of the mask part 18. Groove 1
9, it faces the mask surface 17 in a state where it is shielded from light from the outside. Furthermore, the lower end of the wall 4 enters into the bottom groove 21, thereby ensuring that the film surface 11 is shielded from light.

Next, when shooting is finished and you want to take out cassette 1 from cassette storage chamber 16, press the ejector button 27.
slide backwards. This operation rotates the lock lever 22 rearward, so that its lock engaging portion 25 is disengaged from the recess 13 on the back surface of the wall 4. When the lock engaging portion 25 is removed from the recess 13,
Since the biasing force applied to the lock lever 22 is removed, the lock lever 22, which had been elastically deformed, returns to its original state. As a result, the cassette receiving portion 26 pushes the cassette 1 up from the cassette storage chamber 16, so that a portion of the cassette 1 protrudes from the cassette storage chamber 16, so that the cassette 1 can be easily taken out.

Furthermore, when the camera 14 is not used without the cassette 1 loaded, the opening of the cassette storage chamber 16 can be closed by sliding the lid 29 provided on the top surface of the camera body 15. Dust can be prevented from entering the camera body 15 through the opening. Furthermore, when the cassette 1 is loaded in the cassette storage chamber 16, the display label 9 provided on the top surface of the bridge 6 is exposed to the outside, so the performance of the film in the cassette 1 can be easily known, making it convenient. It is.

Further, the lock engaging portion 25 of the lock lever 22
The lock lever 22 does not come into contact with the contact piece 28 until it engages with the recess 13 formed in the cassette 1. That is, there is no possibility that an accident such as a motor (not shown) being activated before the cassette 1 is completely loaded into the cassette storage chamber 16 and the film being unloaded will not occur.

Note that the present invention may be configured as shown in FIGS. 12 and 13. That is, in this embodiment, the cassette storage chamber 16 opens at the rear surface of the camera body 15, and this opening is opened and closed by the rear cover 40. And cassette storage room 1
A lock lever 22 is pivotally attached to the bottom of the lock lever 22 at its distal end where a cassette receiving portion 26 is formed by a step screw 23, and a lock engaging portion 25 is provided in the middle. Further, the camera body 1 is attached to the rear end of the lock lever 22 protruding from the cassette storage chamber 16.
5 is connected to an ejector button 27 that is slidably provided along the vertical direction of the rear surface. In addition,
The lock lever 22 locks the cassette receiving part 2 by a leaf spring 42 provided on the inner bottom surface of the cassette storage chamber 16.
The end portion on the 6 side is biased toward the inner bottom surface.

On the other hand, as shown in FIG. 13, the cassette 1 has a groove portion 41 and a lock engaging portion 25 on the bottom surface of the supply chamber 2 that engage with the cassette receiving portion 26 of the lock lever 22.
A recessed portion 13 is formed in which the holder is engaged.

Even in such a configuration, if the ejector button 27 is slid in the direction of the arrow after opening the rear cover 40, the biasing force of the lock lever 22 is released and the lock lever 22 is elastically deformed, so that the cassette 1 can be held in place by the cassette receiver 26. can be made to protrude from the cassette storage chamber 16.

Furthermore, although the above embodiments have been described with reference to the case where the present invention is applied to a camera, it goes without saying that the present invention can be applied to any optical device other than a camera that uses a cassette-type film, such as a telephoto camera.

As described above, the present invention provides a lock lever made of an elastic material, which has a lock engaging part at one end and a cassette receiving part at the other end, in the cassette storage chamber, so that the lock lever is provided with a lock lever made of an elastic material and has a lock engaging part at one end and a cassette receiving part at the other end. When the cassette receiving part is pressed and the lock lever is elastically deformed, the lock engaging part engages with the recess formed in the cassette and holds the cassette in the storage chamber. When the lock engaging portion is removed, the lock lever returns to its original position, and the cassette is pressed against the cassette receiving portion and protrudes from the cassette storage chamber. In other words, since the lock lever allows the cassette to protrude from the cassette storage chamber, there is no need for a dedicated spring for this purpose as in the past, which reduces costs by reducing the number of parts and simplifies assembly work. At the same time, the configuration can be simplified.

[Brief explanation of the drawing]

1 to 11 show an embodiment of the present invention, FIG. 1 is an exploded perspective view of the cassette, FIG. 2 is a perspective view of the cassette as seen from the top, and FIG. 3 is a bottom view of the cassette. FIG. 4 is a sectional view of the winding chamber, FIG. 5 is a perspective view of the camera, and FIG. 6 is a perspective view of the camera.
The figures are also cross-sectional views, Fig. 7 is a perspective view when loading a cassette into the cassette storage chamber, Fig. 8 is a cross-sectional view when the cassette is loaded until it hits the cassette receiver of the lock lever, and Fig. 9 is a sectional view of the cassette. FIG. 10 is a sectional view of the same, FIG. 11 is a perspective view of the camera with no cassette loaded, and FIG. 12 is a sectional view of the camera showing another embodiment of the invention. , FIG. 13 is a perspective view of the cassette as seen from the bottom side. DESCRIPTION OF SYMBOLS 1...Cassette, 13...Recessed part, 16...Cassette storage chamber, 22...Lock lever, 25...Lock engaging part, 26...Cassette receiving part, 28... Contact piece.

Claims (1)

[Scope of Claims] 1. A lock lever made of an elastic material having a lock engaging portion at one end and a cassette receiving portion at the other end is provided in the cassette storage chamber in which the cassette is loaded, and the lock lever is provided in the cassette storage chamber in which the cassette is loaded. The lock lever is elastically deformed by pressing the cassette receiving part, so that the lock engaging part engages with a recess formed in the cassette to hold the cassette in the cassette storage chamber. A device for ejecting film cassettes. 2. A film cassette ejector according to claim 1, characterized in that a contact piece that together with a lock lever constitutes a switch is provided in the cassette storage chamber, and the lock lever comes into contact with the contact piece when the lock lever holds the cassette. Device.