JPH08160529A - Film loading structure for camera - Google Patents

Abstract

PURPOSE: To prevent the leading edge of film from being caught by the end face of an aperture grill at the time of initial loading. CONSTITUTION: A guiding projection 39 having an inclined surface 39a which becomes higher and higher in a film feeding direction is formed on a light shielding plate 21a for panoramic photographing, which moves into the aperture grill 15. At the time of initial loading of film, the light shielding plate 21a is moved into the aperture grill 15 so as to guide the leading edge of the film 11 to pass over the aperture grill 15 along the inclined surface 39a of the guiding projection 39 to a film take-up spool 13 side.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a film loading structure for a camera.

[0002]

2. Description of the Related Art Generally, when initially loading a film into a camera, a film cartridge is mounted in a film storage portion of the camera body, and a film front end protruding from a film cartridge's telempe (feeding opening) is pulled out. The film is loaded by setting it on a film take-up spool provided on the side opposite to the storage section and then closing the back cover of the camera.
Recently, even if the leading edge of the film is not pulled out to the film take-up spool, it is loaded into the film storage part with the leading edge of the film slightly pulled out from the film cartridge, and the leading edge of the film is in the aperture. Some cameras have a feeding mechanism that feeds the leading end of the film to a predetermined position on the take-up spool even when the back lid is closed.

[0003]

By the way, in the camera provided with the above-mentioned film feeding mechanism, when the film cartridge is set in the film storing portion at the time of loading the film, the leading end of the film pulled out from the film cartridge is stored in the film storing portion. Often located within an aperture provided between the section and the film take-up reel. Therefore, as shown in FIG. 10, when the leading end portion 100 of the film is fed to the film take-up spool side in the G direction indicated by the arrow by the feeding mechanism (not shown), the leading end portion 100 of the film is more than the aperture. The width is narrow and the film itself is curled.
As a result, the leading end portion 100 of the film may be caught on the end surface 101a of the aperture on the film take-up spool side, and the leading end portion 100 of the film may not be reliably delivered to the film take-up spool side.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to wind a film without causing the leading end of the film to be caught on the end face of the aperture on the film take-up reel side during initial loading of the film. An object of the present invention is to provide an initial film loading structure for a camera that can reliably send the film to the take-up reel side.

[0005]

In order to achieve the above object, the present invention is directed to a film tip drawn from a film cartridge loaded in a film storage portion formed in the vicinity of an aperture surface in a camera body. In a camera equipped with a film feeding mechanism that feeds a portion through the aperture surface to the film take-up spool side at the time of loading, it is possible to appear and disappear in the vicinity of the end surface on the film take-up spool side through which at least the film front end portion of the aperture surface passes. A movable member provided, a guide projection having a slope formed on the side of the movable member through which the film front end passes, and having a slope that temporarily rises along the film feeding direction, and the movable member within the aperture area during film loading. And the slant surface of the guide protrusion is moved in the passage of the film. It is characterized by a control means for advancing to Irumu surface opposed.

Further, the present invention is characterized in that the guide protrusion has a height which substantially coincides with the aperture grille surface in a direction orthogonal to the aperture surface when the guide protrusion advances into the aperture area. Further, the present invention is characterized in that the control means moves the movable member forward and backward from the aperture area in association with the open / closed state of the back cover of the camera. Further, the present invention is characterized in that the control means advances the movable member to the aperture area on condition that the loading of the film is detected and the case back is closed. Further, in the invention, the movable member is biased in a direction of retracting from the aperture area, and the control means moves the lens barrel, and the lens barrel causes the movable member to be biased. It is characterized in that it is pushed and moved in opposition to advance into the aperture area. Further, the present invention is a light-shielding frame for restricting a film exposure area used in a shooting mode with a screen aspect ratio different from that of normal shooting, and is characterized in that it can be arbitrarily advanced into the aperture. In the present invention, the movable member is a light-shielding frame for restricting a film exposure area used in a shooting mode with a screen aspect ratio different from that of normal shooting, and the control means opens and closes the back cover. The light-shielding frame is moved forward and backward from the aperture area in association with the state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the present embodiment, the film loading structure according to the present invention is applied to a compact camera having a function of switching between a standard mode and a panoramic mode as a shooting mode with a shooting area having a screen aspect ratio different from the standard mode. Will be described as an example. FIG. 1 is a perspective view showing a state where the back cover of the compact camera according to the present embodiment is opened.

In FIG. 1, 1 is a camera, 3 is a camera body, and one end of a back cover 5 is attached to the back side of the camera body 3 by a hinge or the like so as to be openable and closable. A film storage portion 9 for storing a film cartridge 7 is provided on one side inside the camera body 3, and a film take-up spool 13 for winding a film 11 is provided on the other side.
The film winding spool 13 is rotationally driven by a winding motor (not shown). Four frame members 15 a, 1 are provided between the film storage unit 9 and the film winding spool 13.
A rectangular frame-shaped aperture grille 15 formed of 5b, 15c, and 15d is provided, and a rubber roller 19 as a film feeding mechanism is provided on the upper portion of the frame member 15a on the film accommodating portion 9 side, as shown in FIG. Is provided. The area surrounded by the frame members 15a to 15d corresponds to the aperture grill (opening) area. The rubber roller 19 is
When the back cover is closed, it is pressed against the portion where the film hole 11a is provided, and is driven to rotate during film loading, and the frictional force causes the film leading end 11 to be fed to the film take-up spool 13 side. In addition, film hole 1
The film 1a is formed on the upper and lower parts of the film other than the film front end 11. A switch 17 for switching between the standard mode and the panorama mode is provided near the finder 16 of the camera body 3.

In the aperture grill 15, a pair of light shielding plates 21a, 21b for shielding the upper and lower surfaces in the aperture grill region from light are provided in a retractable manner in the panorama mode. The light-shielding plates 21a and 21b are formed in an elongated plate shape having a predetermined width and are provided at an upper portion and a lower portion inside the aperture grill 15, respectively, and shield the upper and lower surfaces inside the aperture grill 15 formed in a standard mode screen size. And switch to the panorama mode screen size. This shading plate 21
As shown in FIGS. 3 and 4, a and 21b are provided with a pair of left and right shafts 23 along the longitudinal direction at their base ends integrally through a support member 25, and these shafts 23 are attached to the camera body 3. The light shielding plates 21a and 21b are pivotally supported by a bearing 27 so that they can be opened and closed. In addition, FIG.
Shows the state of the light shielding plates 21a and 21b in the panorama mode.

A projection 29 is provided on one end of each of the light shielding plates 21a and 21b so as to be engaged with a screen size switching mechanism 31. The screen size switching mechanism 31 includes a swing plate 33.
And one end engages with the swing plate 33 and the other end engages with the light shielding plate 2.
1a and 21b, a pair of sliding members 35 having projecting pieces 35a that engage with the respective projections 29, and a base end integrally formed on one sliding member 35 are provided on the screen size changeover switch 17 shown in FIG. It is constituted by the connected rod member 37. In addition, a torsion spring (not shown) is provided around the shaft 23, and biases the light shielding plates 21a and 21b in a direction in which the protrusion 29 and the protrusion 35a are always in contact with each other. With the torsion spring, in the state where the standard mode is selected by the changeover switch 17, the light shielding plates 21a, 2
As shown in FIG. 3, 1b is retracted from the aperture area and is positioned so as not to interfere with the optical path of the photographing optical system. Then, in this state, the light shielding plates 21a, 21
By pressing b against the biasing force of the torsion spring,
Independent of the position of the screen size switch 17,
It is possible to move to the aperture area (to the same position as when selecting the panorama mode). Then, in the standard mode by operating the screen size changeover switch 17, as shown in FIG. 3, the load member 37 is moved in the direction of arrow B, and the light blocking members 21a and 21b are moved to the lens barrel side of the camera body 3 ( The standard screen size is opened by opening it toward the front of the paper).

Then, in the panorama mode, as shown in FIG. 4, the rod member 37 moves in the direction of arrow C,
Aperture grill 15 with light shields 21a and 21b closed
It is located within the aperture grille area specified by and has a screen size for panorama mode. A guide protrusion 39 is integrally formed on the left side (the film take-up spool 13 side) of the upper light-shielding plate 21a on the side where the film front end portion 11 passes, and the guide protrusion 39 is shown in FIG. Thus, it is provided in the vicinity of the end surface 15e of the frame member 15b of the aperture grill 15 located on the film winding spool 13 side. Further, as shown in FIG. 5, the guide projection 39 is formed with a slope 39a that is temporarily raised along the feeding direction of the film front end 11 (direction of arrow D), and the front end b of the slope 39a is Light-shielding plates 21a, 21
When b is located in the aperture area, it is formed to have substantially the same height as the surface of the frame member 15b of the aperture grille 15. Further, as shown in FIGS. 6 and 7, the aperture grill 15 inside the camera body 3
A lens barrel 43 to which the lens system 41 is attached is disposed on the front side (the side to which the light shielding plates 21a and 21b are attached) of the lens barrel 43, and the lens barrel 43 is connected to a lens barrel feeding mechanism (not shown). Has been done.

When the screen size changeover switch 17 is in the standard mode, the lens barrel 43 is moved to the aperture grill 15 side by driving a lens barrel feeding mechanism (not shown) as shown in FIG. It is fed forward (in the direction of arrow E) away from. In the non-photographing state, the end of the lens barrel 43 moves to the vicinity of the aperture area and is stored in the camera. At this time,
As shown in FIG. 7, the light blocking plates 21a and 21b are pressed by the end of the lens barrel against the biasing force of the torsion spring, move into the aperture area, and move to the same position as when the panorama mode is selected. . When the screen size changeover switch 17 is in the panorama mode, the light blocking plates 21a and 21b are kept in the aperture area by the projection 35a regardless of the position of the lens barrel. Becomes

Further, as shown in FIG. 8, the camera body 3 has a built-in microcomputer 45 for controlling the operation of the entire camera. The microcomputer 45 includes a release switch 47, a main switch 49, a back cover switch 51, and a lens mirror. Based on signals input from the cylinder position detection switch 53, the film loading detection switch 55, and the like, a predetermined control signal is sent to the film feeding mechanism (rubber roller 19) 57 and the lens barrel feeding mechanism 5.
Output to 9 mag. The release switch 47 and the main switch 49 are the upper part of the camera body 3, the back cover switch 51 is the opening / closing part of the back cover 5, and the lens barrel position detection switch 53 is the lens barrel by the protrusion 43b provided on the lens barrel 43. When the switch 43 is in the retracted position, the push switch is turned on.
It is possible to detect the storage position in the optical axis direction of No. 3. The film loading detection switches 55 are mounted in the film storage section 9, respectively. When the main switch 49 is turned on, the lens barrel delivery mechanism 59 delivers the lens barrel 43 from the retracted state to a predetermined position in front based on a control signal from the microcomputer 45 to bring it into a photographing ready state. Further, when the release switch 47 is pressed, the microcomputer 45 outputs a control signal to an exposure adjusting mechanism, a focus adjusting mechanism, a shutter mechanism, etc. (not shown) to perform photographing. Also, the back cover switch 51
At the time of initial loading of the film, the film cartridge 7 is loaded into the film storage section 9 and
Is set on the aperture grill 15 and closed by closing the back cover 5, the film feeding mechanism (rubber roller 19) 57 is rotated and moved based on a control signal from the microcomputer 45 to move the film. The tip portion 11 is sent to the film winding spool 13 side.

Next, the initial film loading operation of the camera having the above construction will be described with reference to the flow chart shown in FIG. First, the back cover switch 51 detects whether the back cover 5 is open or closed (step S1). At this time, when the back cover 5 is closed, the back cover switch 51 is in the on state, and when it is open, the back cover switch 51 is in the off state.
When the back cover switch 51 is off in step S1 (when the back cover 5 is open), the lens barrel 43 is then stored in a predetermined storage position in the camera body 3 as shown in FIG. The lens barrel position detection switch 53 detects whether or not it is turned on (step S2). When the lens barrel 43 is not stored in the camera body 3 (see FIG. 6), the lens barrel 43 is stored (step S3). When the lens barrel 43 is stored in step S2, next, the film loading detection switch 55 detects whether the film cartridge 7 is loaded in the film storage portion 9 (step S4). In step S4, the film cartridge 7 is still in the film storage portion 9
If it has not been loaded in, the process returns to step S1.

Then, the film cartridge 7 is loaded into the film storage portion 9, the film front end portion 11 is set on the aperture grill region, and the back lid 5 is closed.
The film loading detection switch 55 is the film cartridge 7.
Is detected, and the back cover switch 51 detects opening / closing of the back cover 5 (steps S4 and S5). Steps S2, S4
In S5, the lens barrel 43 is stored in the camera body 3, the film cartridge 7 is stored in the film storage portion 9,
When the lens barrel position detection switch 53, the film loading detection switch 55, and the back cover switch 51 detect that the back cover 5 is closed, and these detection signals are input to the microcomputer 45, the microcomputer 45 Outputs a rotation driving signal to the film feeding mechanism 57 and feeds the film front end 11 to the film take-up spool 13 side by the frictional force of the rubber roller 19 which is rotationally driven to execute the initial loading (step S6). At this time, as shown in FIG.
By being sent out to the film take-up spool 13 side along a, the film front end 11 is surely initially loaded without being caught by the end surface 15e of the frame member 15b of the aperture grille 15.

When the film front end 11 is initially loaded in step S6, the film front end 11 is wound by the film winding spool 13. Then, when the main switch 49 is turned on, the microcomputer 45 outputs a control signal to the lens barrel extension mechanism 59 to extend the lens barrel 43, and holds the lens barrel 43 in a photographable state (steps S7, S).
8). In the image-capable state, the light-shielding plates 21a and 21b can be moved by operating the changeover switch 17 to arbitrarily select the standard mode or the panoramic mode.
Then, when the photographer presses the release switch 47, photographing is performed. As described above, in this embodiment, at the initial loading of the film, the film front end portion 11
Is sent out to the film take-up spool 13 side through the frame member 15b of the aperture grill 15 along the slope 39a of the guide projection 39 formed on the light shielding plate 21a, so that the end surface 15 of the frame member 15b of the aperture grill 15 is
It is possible to prevent being caught by e.

In the above embodiment, the case where the present invention is applied to the compact camera with the panorama mode function has been described as an example, but the invention is also applicable to the camera with only the standard mode function without the panorama mode function. You can
In this case, one of the light shielding plates 21a as in the above embodiment
A movable member that operates like the above is provided in the camera body 3 so as to be retractable in the aperture grill 15, and the movable member is provided with the guide projection 39 having the same inclined surface 39a as described above. It is possible to reliably prevent the leading end of the film from being caught on the grill.

[0018]

As described above, according to the present invention, the movable member is moved into the aperture grill at the time of initial film loading, and the film front end portion is moved along the slope of the guide projection formed on the movable member. Since the film can be guided to the spool side of the film through the grill, the initial loading can be reliably performed without the leading end of the film being caught on the end face of the aperture grill.

[Brief description of drawings]

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

FIG. 2 is a front view of relevant parts showing the light shielding member and the aperture grille shown in FIG.

FIG. 3 is a perspective view showing a light blocking member in an opened state.

FIG. 4 is a perspective view showing a light shielding member in a closed state.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a sectional side view showing the lens barrel in a drawn-out state.

FIG. 7 is a sectional side view showing the lens barrel in a stored state.

FIG. 8 is a schematic block configuration diagram showing a control system of the camera.

FIG. 9 is a flowchart showing an operation process at the time of initial film loading.

FIG. 10 is an explanatory diagram showing a state of the leading end portion of the film during conventional initial film loading.

[Explanation of symbols]

 1 camera 3 camera body 7 film cartridge 9 film storage part 11 film tip part 13 film take-up spool 15 aperture grille 15a, 15b, 15c, 15d frame material 19 sprockets 21a, 21b shading plate (movable member) 39 guide protrusion 39a slope

Claims (7)

[Claims] 1. A film take-up spool side which passes a leading end of a film, which is pulled out from a film cartridge loaded in a film accommodating portion formed in the vicinity of an aperture surface in a camera body, on the aperture surface at the time of loading. In a camera provided with a film feeding mechanism for feeding the film to a device, a movable member provided so as to be retractable in the vicinity of an end surface on the film take-up spool side through which at least the film front end of the aperture surface passes, and the film front end of the movable member A guide protrusion having a slope formed on the side through which the film is raised for a while along the feeding direction of the film, and the movable member is moved into the aperture area at the time of film loading, and the slope of the guide protrusion is formed in the passage of the film. Control means for advancing so as to face the film surface, A film loading structure for a camera, comprising: 2. The film loading structure for a camera according to claim 1, wherein the guide protrusion has a height that substantially coincides with the aperture grille surface in a direction orthogonal to the aperture surface when advancing into the aperture area. 3. The film loading structure for a camera according to claim 1, wherein the control means moves the movable member forward and backward from the aperture area in association with an open / closed state of a back lid of the camera. 4. A film loading structure for a camera according to claim 1, wherein said control means advances said movable member to an aperture area on condition that said film loading is detected and said back cover is closed. 5. The movable member is biased in a direction of retracting from the aperture area, and the control means is
4. The film loading structure for a camera according to claim 3, wherein the lens barrel is moved, and the movable member is pushed and moved against the biasing force by the lens barrel to advance into the aperture area. 6. The movable member is a light-shielding frame for restricting a film exposure area used in a shooting mode with a screen aspect ratio different from that of normal shooting, and can be arbitrarily advanced into the aperture. The film loading structure of the camera described in 1. 7. The movable member is a light-shielding frame for restricting a film exposure area used in a shooting mode with a screen aspect ratio different from that of normal shooting, and the control means is an open / closed state of the back cover. 7. The film loading structure for a camera according to claim 6, wherein the light-shielding frame is moved back and forth from the aperture area in conjunction with.