JP3807570B2 - Camera with switchable screen size - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera device capable of switching the screen size, and in particular, a screen that can change the length of the roll film in the moving direction for each shooting frame so that the shooting screen size can be changed to a standard size and a panorama size. It relates to a camera whose size can be switched.
[0002]
[Prior art]
In recent years, a camera capable of switching between standard size and panoramic size in a single film has been put into practical use, and shooting is performed with an appropriate amount of light shielded on the upper and lower parts of a standard size frame (24 mm x 36 mm) of a 35 mm film, An apparatus that provides a panoramic photograph by enlarging this is known (Japanese Patent Laid-Open No. 5-072655, etc.). This type of panoramic picture has a drawback that the image quality is lowered because the enlargement ratio is larger than that of a standard-size frame.
[0003]
On the other hand, a camera has been proposed in which the long side of a standard size frame is extended on a film so that, for example, 24 mm × 65 mm is one panoramic size (Japanese Patent Laid-Open No. 8-106123). In such a camera, the aperture of the aperture provided behind the photographic lens can be formed in the size of a panoramic frame, and an appropriate amount of light can be shielded from the left and right sides of the aperture to perform standard size shooting. It is like that.
[0004]
[Problems to be solved by the invention]
In a camera that switches between a standard size and a panoramic size that is expanded from the standard size in the film traveling direction, the size of the aperture opening arranged behind the taking lens is formed to the size of a panoramic size frame. A mechanism for switching the screen size by providing light shielding plates that slide in a plane parallel to the aperture of the aperture on the left and right sides of the aperture is conceivable.
[0005]
However, such a mechanism requires a space for retracting the light shielding plate to the outside of the opening, and there is a problem that the lateral dimension of the camera increases.
The present invention has been made in view of such circumstances, and a screen-switchable camera that can save space for a light-shielding plate that expands and contracts an exposure opening and that can reduce the size of the camera. The purpose is to provide.
[0006]
[Means for solving the problems]
In order to achieve the above object, the present invention provides a camera capable of changing the size of a shooting frame exposed on a film. An aperture in which an opening for exposure is formed, and a light-shielding member which is movable forward and backward in at least a part of the opening for exposure, At least two light-shielding plates movable in a plane parallel to the aperture opening of the aperture With Each of the light shielding plates is arranged continuously in the moving direction so as to shield a part of the opening for exposure, and at least a part of at least two light shielding plates are overlapped to be retracted outside the opening for exposure. Is A light-shielding member, a lever that moves together with the light-shielding plate, a biasing means that biases the lever in the moving direction, and a biasing position formed on the lever corresponding to the fixed position of the light-shielding plate. A click hole having a different diameter according to the magnitude of a biasing force applied to the lever by the means, and a fixing means that fits into the click hole and fixes the lever and the light shielding plate at the fixed position. It is characterized by that.
[0007]
According to the present invention, when shooting with a screen size smaller than the exposure opening formed in the aperture, the light shielding member composed of at least two light shielding plates advances to the inside of the exposure opening, and each light shielding plate It arranges so that it may spread continuously, and covers a part of opening for exposure. On the other hand, when shooting with a screen size that is the same size as the exposure opening formed in the aperture, the light shielding member is retracted to the outside of the exposure opening. At this time, among the plurality of light shielding plates, at least two of the light shielding plates overlap each other and are retracted to the outside of the exposure opening, so that the retreat space of the light shielding member can be reduced.
[0008]
The present invention can be applied to a camera employing a focal plane shutter. By combining the aperture frame and the focal plane shutter described above, the screen size can be switched in a camera equipped with a focal plane shutter. . In addition, the present invention is particularly effective when applied to a camera in which the size of a photo frame exposed on a film can be switched between a standard size and a panorama size obtained by expanding the standard size in the film traveling direction. In this case, the aperture for the panorama size is formed in the aperture, and the left and right portions of the panorama size for the exposure opening can be shielded by the light shielding member. Further, the click hole is formed at a retracted position of the light shielding plate and a position where a part of the aperture is shielded by the light shielding plate and the exposure opening for the standard size is defined. The light shielding member having such a configuration may be provided on at least one of the left and right portions of the exposure opening.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a camera capable of switching the screen size according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a front external view of a camera using the present invention. A photographic lens 2 is detachably attached to the front center of the camera 1 body, and the focal length of the photographic lens 2 can be changed by exchanging the lenses. For example, a bayonet mount is used as the lens mount, and the lens can be removed from the camera 1 body by rotating the lens barrel 6 while pressing the attach / detach button 4.
[0010]
The camera 1 can be equipped with two types of lenses, a photographing lens having a focal length of 90 mm and a photographing lens having a focal length of 45 mm. The focal length is not limited to these.
A finder objective window 8, a daylighting window 10, and a distance meter window 12 are provided on the front surface of the camera 1, and an ISO dial 14 is rotatably disposed on the left side of the distance meter window 12. In the figure, reference numeral 16 denotes a self lamp, and reference numeral 17 denotes a sync terminal for inserting a flash sync code.
[0011]
FIG. 2 is a top external view of the camera 1. A diaphragm ring 18 and a distance ring 20 are rotatably provided on the peripheral surface of the lens barrel 6. The diaphragm is adjusted by rotating the diaphragm ring 18, and the focus is adjusted by rotating the distance ring 20. be able to.
On the upper surface of the camera 1, a release button 22, a main dial 24, a shutter speed setting dial 26, a film counter (remaining amount display portion) 28, and a hot shoe 30 are provided.
[0012]
The main dial 24 is a mode selection dial / main switch. The main switch is turned on by rotating the dial from the “OFF” position, and the shooting mode is set to the single mode (S) or the continuous shooting mode (C). ), Self-mode can be set.
The main dial 24 also serves as an exposure correction dial (flacon dial). By turning the dial while pressing the center button 24a, exposure correction of ± 2 EV can be set in 0.5 steps.
[0013]
The camera 1 has an aperture-priority automatic exposure control function. When the shutter speed setting dial 26 is set to “auto”, the shutter speed is automatically controlled based on TTL photometry. . The central button 26a of the shutter speed setting dial 26 is a setting lock / release button.
A liquid crystal display is used for the film counter 28 to display the remaining number of shootable pictures of the film. As a method of detecting the remaining amount, for example, the total number of perforations n is detected during prewinding, the number of perforations is counted for each frame feeding (in this case, for each frame rewinding), and the remaining number of perforations is counted for one frame. By dividing by the number of perforations required per unit, the remaining number of films can be grasped.
[0014]
Specifically, preliminary winding is performed immediately after the film cartridge is loaded, and the total number of perforations is detected to detect the length of the film. Each time the film is exposed by the release operation, the film is fed into the cartridge at a film feed amount (8 perforations for the standard size and 14 perforations for the panorama size) corresponding to the screen size of the shooting frame. The remaining length of the film is calculated by subtracting the film feed amount (8 or 14 perforations) from the total length (total number of perforations) of the film that can be rewound and photographed.
[0015]
The remaining film length is divided by the film feed amount for one frame (8 or 14 perforations) to obtain the number of shootable images for each screen size. The number of shootable images obtained in this way is displayed on the film counter 28. When displaying the number of images that can be shot in the panorama size, the letter “P” is simultaneously displayed at the upper left of the number displayed to clearly indicate that the remaining amount display is equivalent to the panorama size.
[0016]
Note that the film counter 28 may display only the number of images that can be shot according to the screen size to be shot next, or the screen size selected by the photographer by operating a display switching button (not shown). The number of shootable images may be displayed.
FIG. 3 is an external view of the back side of the camera 1. A finder eyepiece 32, a screen switching knob 34, and a liquid crystal display unit 36 are provided on the back of the camera 1. Reference numeral 38 denotes a film confirmation window.
[0017]
The screen switching knob 34 is an operation member for switching screen patterns corresponding to two types of print aspect ratios of a standard (normal) size and a panorama size. The screen switching knob 34 is rotatable about an axis 34a, and is selectively selected at any one of two stop positions corresponding to the standard (N) and panoramic (P) screen sizes. Set to
[0018]
The liquid crystal display unit 36 displays information indicating the remaining battery level, the set mode, and the like. An auto bracket mode selection switch (AEBSW) 40, an EL switch (ELSW) 41, and a midway rewind switch (MUSW) 42 are provided below the liquid crystal display unit 36.
The auto bracket mode selection switch 40 is a button for setting a shooting mode in which three images are shot continuously while changing exposures such as appropriate, under, and over. The EL button 41 is a switch for operating the backlight of the liquid crystal display unit 36 to be turned on / off.
[0019]
The back cover 44 of the camera 1 can be opened and closed via a hinge (not shown) on the right side in FIG. 3, and when the cover release lever (not shown) on the side of the camera is operated, the back cover 44 is unlocked and the film is removed. It can be loaded and replaced. The film used for the camera 1 is, for example, a well-known 35 mm film. In the cartridge chamber of the camera 1, a detection pin for detecting a camera automatic detection code (DX code) formed on the wall surface of the cartridge is used. (Shown) is provided. When the ISO dial 14 is set to “DX”, ISO sensitivity information is read based on the DX code automatically sensed through the detection pin.
[0020]
Although not shown in the figure, a battery cover is provided on the bottom surface of the camera 1 so that it can be opened and closed. By opening the battery cover, a battery for power supply can be loaded and replaced.
FIG. 4 is a plan view showing a configuration of an optical system of a finder incorporated in the camera shown in FIG. This camera 1 is a distance meter interlocking camera, and employs a daylighting type bright frame finder.
[0021]
The finder portion of the camera 1 includes a distance measuring mirror 46, a distance measuring roof prism 48, a distance measuring objective lens 50, a daylighting mirror 52, a daylighting prism 54, a reticle group 56, a target lens group 58, a convex objective lens 60, The optical system includes a prism 62, an f = 45 mm eyepiece lens group 64 (corresponding to a first eyepiece lens), an f = 90 mm eyepiece lens group 66 (corresponding to a second eyepiece lens), and the like. The prism 62 is provided with a semi-transmissive coat (half coat) 62a.
[0022]
The interlocking mechanism of the distance meter is not shown, but as is well known, a ring that advances and retreats in the direction of the optical axis in accordance with the turning operation of the distance ring 20 is provided at the rear end portion of the lens barrel 6. A lever having a roller that contacts the ring is provided, and the lever swings in the front-rear direction of the optical axis in conjunction with the forward and backward movement of the ring.
[0023]
Then, the distance measurement image is moved by moving the distance measuring objective lens 50 in the direction orthogonal to the optical axis (up and down direction in FIG. 4) by the movement of the lever, and the moving frame of the reticle group 56 is moved obliquely. The parallax correction is performed. The configuration of the reticle group 56 will be described later (FIG. 7).
Thus, by rotating the distance ring 20 of the lens barrel 6, the photographing lens 2 is moved back and forth in the optical axis direction by the helicoid, and the distance measuring objective lens 50 is moved, so that the viewfinder eyepiece 32 is moved. The degree of matching of the upper and lower images of the finder split image observed through the screen changes. Then, the photographing lens 2 is set to the in-focus position at the position where the upper and lower images match (the position where the distance meter image and the viewfinder image match).
[0024]
The two eyepiece lens groups 64 and 66 are respectively held by lens frames 68 and 70, and both the lens frames 68 and 70 are connected to each other via a connecting pin 72 so as to be rotatable. A spring 74 is provided at the connecting portion of the lens frames 68 and 70, and the lens frame 68 is urged clockwise in FIG. 4 about the connecting pin 72 by the force of the spring 74, and the lens frame 70 is connected to the connecting pin 72. It is urged counterclockwise around the center.
[0025]
Further, bosses 68a and 70a are projected from the upper portions of the lens frames 68 and 70, respectively, and the bosses 68a and 70a are guide grooves 78a of a plate 78 disposed above the eyepiece lens groups 64 and 66, respectively. , 78b (see FIG. 5). The both eyepiece lens groups 64 and 66 are movable by being regulated by a guide constituted by the bosses 68a and 70a and the guide grooves 78a and 78b.
[0026]
Although the mechanism for sliding the eyepiece lens groups 64 and 66 will be described in detail later, when the photographing lens 2 of f = 45 mm is attached, the 45-mm eyepiece lens group 64 is a prism as shown by the solid line in FIG. The 90-mm eyepiece lens group 66 is disposed between the eyepiece window 76 and the eyepiece window 76, and is retracted to a space on the left side of the 45-mm eyepiece lens group 64 and behind the target lens group 58. In the figure, the 90-mm eyepiece lens group 66 is retracted to the space behind the target lens group 58, but the retracted position of the 90-mm eyepiece lens group 66 is not limited to this. Any space behind the daylighting optical system from the daylighting window 10 to the semi-transmissive coat (halfcoat) 62a of the prism 62 may be used.
[0027]
On the other hand, when the photographing lens 2 of f = 90 mm is attached, the 90 mm eyepiece group 66 advances between the prism 62 and the eyepiece window 76 (on the viewfinder optical axis), and the 45 mm eyepiece group 64 is shown in FIG. As shown by a two-dot chain line in FIG. 4, it rotates clockwise around the connecting pin 72 and retracts to the side of the camera 1 in a bent state.
Next, a switching mechanism for the eyepiece lens group will be described.
[0028]
FIG. 5 is a plan view of the switching mechanism of the eyepiece lens group. A flat plate 78 is disposed so as to cover the prism 62 and the eyepiece lens groups 64 and 66 described in FIG. 4, and the guide groove 78a for guiding the movement of the eyepiece lens groups 64 and 66 is provided on the plate 78. 78b are formed. The guide groove 78a is formed in a substantially L shape, and the boss 68a of the lens frame 68 of the 45mm eyepiece group 64 is engaged with the guide groove 78a. On the other hand, the guide groove 78b is formed linearly, and the boss 70a of the lens frame 70 of the 90mm eyepiece group 66 is engaged with the guide groove 78b.
[0029]
Four connecting members are mainly supported on the plate 78. The first connecting member 80 is rotatably supported on the shaft 78 c of the plate 78. The first connecting member 80 has one arm portion 80a and two connecting pins 80b and 80c, and the boss 68a of the lens frame 68 is engaged with the long hole 80d of the arm portion 80a. The first connecting member 80 is formed with a spring hook pin 80e, and one end of a spring 82 is hooked on the spring hook pin 80e. The other end of the spring 82 is hooked on a spring hook pin 78 d formed on the plate 78. When the first connecting member 80 is at the position shown by the solid line in FIG. 5 (45 mm position), the spring 82 urges the first connecting member 80 counterclockwise to bring the connecting pin 72 to the left end of the guide groove 78a. The 45-mm eyepiece lens group 64 is positioned at the observation position.
[0030]
When the first connecting member 80 is rotated to the position indicated by the two-dot chain line in FIG. 5 (90 mm position), the spring 82 urges the first connecting member 80 in the clockwise direction to move the 90 mm eyepiece group 66. The 90 mm eyepiece group 66 is positioned at the observation position by pressing the boss 70a against the right end of the guide groove 78b.
The second connecting member 84 is formed in a substantially L shape and is rotatably supported by the shaft 78e of the plate 78. The distal end portion of the second connecting member 84 is formed in a U shape, and the distal end portion is engaged with the connecting pin 80 d of the first connecting member 80. Further, the second connecting member 84 is engaged with a distal end portion 94a of a sixth connecting member 94 described later, and is rotated about a shaft 78e in conjunction with the sixth connecting member 94.
[0031]
The third connecting member 86 is rotatably supported by a shaft 78f formed on the plate 78, and has two long and short arms with the shaft 78f as a fulcrum. A connecting pin 80c of the first connecting member 80 is engaged with the long hole 86a formed in the longer arm portion, and the fourth connecting member 88 is connected to the hole 86b formed in the short arm portion. The pin 88a is engaged.
[0032]
The fourth connecting member 88 has elongated holes 88b and 88c, and the connecting pins 78g and 78h of the plate 78 are inserted into the elongated holes 88b and 88c, respectively. The fourth connecting member 88 is guided by the elongated holes 88b and 88c and the connecting pins 78g and 78h and is slidable in the vertical direction in the figure. The fourth connecting member 88 is interlocked with the rotation of the third connecting member 86. Is designed to move up and down.
[0033]
Further, a lever portion 88d is formed at the center side portion of the fourth connecting member 88. The lever portion 88d engages with a 45mm / 90mm switching frame 110 of a reticle group 56, which will be described later, in accordance with lens replacement. The 45 mm / 90 mm switching frame 110 is slid.
FIG. 6 is a main part configuration diagram of the front side of the switching mechanism of the eyepiece lens group. As shown in the figure, the right side of the mount to which the photographic lens 2 is attached is connected to a fifth connecting member 91 that is movable in the vertical direction, and is rotatably connected via the fifth connecting member 91 and a pin 92. A sixth connecting member 94 is also provided.
[0034]
The fifth connecting member 91 has long holes 91a and 91b that are long in the vertical direction, and the pins 96 and 97 of the camera body are inserted into the long holes 91a and 91b, respectively. And the 5th connection member 91 can move to the up-down direction in FIG. 5 along the guide which consists of the said long holes 91a and 91b and the pins 96 and 97. As shown in FIG. A hook 91 c is formed at the lower end of the fifth connecting member 91, and a tension spring 98 is passed between the hook 91 c and the pin 96. The fifth connecting member 91 is biased upward in the figure by the spring force of the tension spring 98.
[0035]
Further, a protrusion piece 91 d is formed on the central left side of the fifth connecting member 91. On the other hand, a claw 99 that engages with the protruding piece 91d is formed on the peripheral surface of the rear end of the lens barrel of the photographing lens 2 with f = 90 mm. In the figure, the lens barrel 6 is omitted, and only the claw 99 is shown.
When the lens barrel of the photographic lens 2 of f = 90 mm is seated on the mount of the camera 1 and is tightened in the right screw direction, the claw 99 pushes down the protruding piece 91d of the fifth connecting member 91, and the fifth connecting member 91 As shown by the two-dot chain line in FIG.
[0036]
On the other hand, the claw 99 as described above is not formed on the lens barrel of the photographing lens of f = 45 mm, and when the lens barrel of f = 45 mm is attached to the mount of the camera 1, a solid line in FIG. As shown by 5, the fifth connecting member 91 moves upward.
A sixth connecting member 94 connected to the fifth connecting member 91 via a pin 92 is rotatably supported by the shaft 100 of the camera body, and interlocks with the vertical movement of the fifth connecting member 91. Then, it swings around the shaft 100. The distal end portion 94a of the sixth connecting member 94 is bent approximately 90 degrees toward the rear of the camera, and the bent distal end portion 94a is engaged with the second connecting member 84 shown in FIG.
[0037]
Next, the configuration of the reticle group will be described.
FIG. 7 is a diagram showing a configuration of reticle group 56 shown in FIG. The reticle group 56 includes a holding frame 102, a moving frame 104, a reticle plate 106, a standard / panoramic switching frame (hereinafter referred to as an NP switching frame) 108, a 45 mm / 90 mm switching frame 110, and a pressing frame in order from the bottom in the figure. 112.
[0038]
The holding frame 102 is a member that holds the moving frame 104, the reticle plate 106, and the like, and is fixed to the camera 1 body. The moving frame 104 is a member that performs automatic parallax correction according to the back-and-forth movement of the photographic lens 2, and is obliquely moved by a guide formed by the long holes 102 a and 102 b formed in the holding frame 102 and the pins 114 and 115. It is guided so as to be movable (in the diagonal direction of the screen).
[0039]
The moving frame 104 is urged diagonally right upward in FIG. 7 by a spring 118, and the lower left corner of the moving frame 104 engages with a lever 120 that moves horizontally in conjunction with the extension of the photographic lens 2. In conjunction with the movement of the lever 120, it is regulated by a guide comprising the pins 114, 115 and the long holes 102a, 102b and moves in an oblique direction in FIG.
[0040]
The reticle plate 106 includes an optical image frame defining a frame for a photographing lens with f = 45 mm, an optical image frame defining a frame for a photographing lens with f = 90 mm, an optical image frame defining a frame for a standard size, and An optical image frame defining a panoramic size frame is formed, and the reticle plate 106 is fixed to the moving frame 104 by pins 122 and 123.
[0041]
The NP switching frame 108 is guided in a diagonally upward direction in the figure by a guide composed of the long holes 108a and 108b and the pins 125 and 126, and by the vertical movement of the pin 128 engaged with the long hole 108c. Switch the reticle masking. The driving mechanism of the pin 128 will be described later (FIG. 8).
The 45 mm / 90 mm switching frame 110 is guided by a guide constituted by the long holes 110a and 110b and the pins 125 and 126, and is engaged with the lever portion 88d of the fourth connecting member 88 described in FIG. Then, the reticle shielding is switched by the movement of the lever portion 88d of the fourth connecting member 88 (the movement in the left-right direction in FIG. 7).
[0042]
The presser frame 112 sandwiches and fixes three members of the reticle plate 106, the NP switching frame 108, and the 45 mm / 90 mm switching frame 110 between the moving frame 104, and the moving frame 104 is fixed by pins 125 and 126. Mounted on. A distance measuring window 112a for observing the split image is formed in the approximate center of the holding plate 112.
[0043]
With this configuration, the 45 mm / 90 mm switching frame 110 moves according to the type of the taking lens 2 mounted on the lens mount of the camera 1, and the NP switching frame 108 moves according to the standard / panoramic screen size switching. Only the optical image frame that matches the shooting conditions is visible. Further, the moving frame 104 moves in conjunction with the operation of the distance ring 20 of the lens barrel 6, and parallax correction is performed.
[0044]
Next, the standard / panoramic screen size switching means will be described.
FIG. 8 is a diagram showing an internal configuration of the camera 1 around the screen switching knob 34. Reference numeral 130 in the drawing denotes a rotating member fixed to the shaft 34 a of the screen switching knob 34. A first standard / panoramic connecting lever (hereinafter referred to as a “first NP connecting lever”) 132 is guided by a long hole 132a and a pin 134 and is slidable in the horizontal direction (left and right in the figure) below the rotating member 130. Is provided.
[0045]
The first NP connecting lever 132 is connected to the rotating member 130 via a connecting pin 136. When the rotating member 130 is rotated about the shaft 34a by the rotation operation of the screen switching knob 34, the first NP is connected. The connecting lever 132 moves in the left-right direction in the figure.
A claw 132b formed on the bottom surface of the first NP coupling lever 132 is engaged with a second standard / panoramic coupling lever (hereinafter referred to as a second NP coupling lever) 180 of an aperture switching mechanism, which will be described later, and a screen switching knob. The operating force 34 is transmitted as the driving force of the aperture switching mechanism.
[0046]
A reticle group 56 held by the holding frame 102 described with reference to FIG. 7 is arranged on the right side of the rotating member 130, and a reticle driving mechanism 140 is provided on the right side of the reticle group 56.
The reticle driving mechanism 140 is mainly composed of a column 142, an elevating member 144, a pin 128, and the like. Both upper and lower ends of the column 144 are supported by the holding frame 102, and the elevating member 144 is supported by the column 142 so as to be movable in the vertical direction. The pin 128 is fixed to the upper portion of the elevating member 144, and the pin 128 is engaged with the elongated hole 108c of the NP switching frame 108 of the reticle group 56 through the hole 102c of the holding frame 102 (see FIG. 7).
[0047]
Further, the elevating member 144 is biased downward in FIG. 8 by a spring 146, and a pin 148 is screwed into the lower end portion of the elevating member 144, and the tip of the pin 148 protrudes from the bottom portion of the elevating member 144. It is in a state.
The tip of the pin 148 is in contact with the right end portion of the first NP connection lever 132 by the force of the spring 146, and as the first NP connection lever 132 slides, the pin 148 moves up and down by the action of the slope portion 132 c of the first NP connection lever 132. The member 144 moves up and down. Note that the tip portion of the pin 148 is formed in a hemispherical shape, and the sliding friction with the inclined surface portion 132c and the flat portion 132d of the first NP connecting lever 132 is reduced.
[0048]
With this configuration, in the panorama setting shown by the solid line in FIG. 8, the tip of the pin 148 rides on the flat portion 132d of the first NP connection lever 132, and the elevating member 144 is positioned upward. On the other hand, when the screen switching knob 34 is rotated in the clockwise direction in FIG. 8 and set to the standard size, the first NP connecting lever 132 slides to the left and moves up and down as shown by the two-dot chain line in the figure. The pin 148 at the bottom of the member 144 descends along the slope 132c. Thus, the elevating member 144 moves downward, and the pin 128 fixed to the elevating member 144 is driven downward.
[0049]
In this way, the lifting member 144 moves up and down according to the rotation position of the screen switching knob 34, and the pin 128 fixed to the lifting member 144 is driven up and down. The driving force of the pin 128 moves the NP switching frame 108 of the reticle group 56.
Further, a metal contact plate 150 is fixed to the upper left portion of the first NP connecting lever 132 via a screw 152. The metal contact plate 150 is bent like a leaf spring, and the tip of the metal contact plate 150 is urged toward the electric circuit board 154 by its elastic force.
[0050]
Therefore, when the first NP connecting lever 132 slides in the left-right direction in the drawing in conjunction with the turning operation of the screen switching knob 34, the connection point of the metal contact plate 150 that contacts the electric circuit board 154 is switched, and the standard / panoramic The screen size setting can be detected electrically.
Next, the aperture switching mechanism will be described.
[0051]
FIG. 9 is a diagram showing the configuration of the aperture switching mechanism. An aperture frame 162 having an opening window (exposure opening) 160 for exposing a panoramic frame is disposed behind the photographic lens 2. A patrone chamber (not shown) is provided on the left side of the aperture frame 162 and a right side is provided on the right side. A spool chamber is provided. The opening window 16 is formed in a horizontally long rectangular shape of 24 mm × 65 mm, for example.
[0052]
A focal plane shutter (not shown) is provided between the photographing lens 2 and the aperture frame 162 so as to be in close contact with the aperture frame 162. This focal plane shutter is a square-type shutter in which the shutter curtain travels in the vertical direction of the screen. The front surface of the shutter curtain (the surface on the photographic lens side) has a surface treatment that has the same reflectance as the film surface. It has been subjected.
[0053]
A first light-shielding frame 164 that can move forward and backward with respect to the opening window 160 is provided on the left side of the aperture frame 162, and a second light-shielding frame that can move forward and backward with respect to the opening window 160 on the right side of the aperture frame 162. 166 and a third light shielding frame 168 are provided.
The first light-shielding frame 164 has long holes 164a and 164b, and is guided by pins 170 and 171 projecting from the long holes 164a and 164b and the aperture frame 162 so as to be slidable in the horizontal direction in the figure. .
[0054]
Similarly, the second light-shielding frame 166 is guided by pins 173 and 174 and elongated holes 166a and 166b and supported by sliding in the left-right direction, and the third light-shielding frame 168 is guided by pins 176 and 177 and elongated holes 168a and 168b and left and right. It is slidably supported in the direction.
On the upper portion of the aperture frame 162, a second NP connecting lever 180 is guided by pins 182 and 183 and elongated holes 180a and 180b, and is supported so as to be slidable in the left-right direction in the drawing. The second NP connection lever 180 is connected to the first NP connection lever 132 described with reference to FIG. 8 via the claw 132b, and moves in the left-right direction in conjunction with the movement of the first NP connection lever 132.
[0055]
The second NP connection lever 180 is formed with a click hole 180c, and the click ball is fitted into the click hole 180c by the sliding movement of the second NP connection lever 180, thereby suppressing backlash of the second NP connection lever 180. ing.
The second NP connecting lever 180 and the first light shielding frame 164 are connected by a first frame lever 186. The first frame lever 186 is rotatably supported on the shaft 187, the upper end of the first frame lever 186 is engaged with the pin 180 d of the second NP connection lever 180, and the lower end is a pin of the first light shielding frame 164. 164c is engaged.
[0056]
A hook 186 a is formed at the top end of the first frame lever 186, and a tension spring 188 is passed between the hook and the pin 162 a of the aperture frame 162. The tension spring 188 urges the first frame lever 186 in the counterclockwise direction in the drawing, and the first light shielding frame 164 has a force in a direction to advance inside the opening window 160 (standard size frame position direction). Has been added.
[0057]
The right end of the second NP connecting lever 180 is provided with an arm portion 180d extending downward by approximately 90 degrees, and the arm portion 180d is connected to the second frame lever 192 via a connecting pin 190. The second frame lever 192 is rotatably supported by a shaft 162 b provided at the upper right corner of the aperture frame 162 and is connected to the third light shielding frame 168 via a connecting pin 194.
[0058]
Further, the tip of the second frame lever 192 (the lower end in FIG. 9) is engaged with a pin 166 c projecting from the lower right corner of the second light shielding frame 166.
A hook 166d is formed at the distal end of the guide portion where the long hole 166a of the second light shielding frame 166 is formed, and a tension spring 198 is provided between the hook 166d and a pin 162c projecting from the lower left corner of the aperture frame 162. Has been passed. The second light-shielding frame 166 is urged leftward in the drawing by the tension spring 198, and both the second light-shielding frame 166 and the third light-shielding frame 168 are advanced in the opening window 160 (standard size frame position direction). Power is applied.
[0059]
Next, the operation of the aperture switching mechanism configured as described above will be described. When the screen switching knob 34 is set to the panorama side, the first NP connecting lever 132 moves to the right side in the drawing as shown by the solid line in FIG. 9, and in conjunction with this, the second NP connecting lever 180 moves the tension spring 188, It moves rightward against the urging force of 198 and stops at the position where the click ball is engaged with the click hole for the panorama.
[0060]
By this movement, the first light shielding frame 164 retracts to the outside of the opening window 160, and the second and third light shielding frames 166 and 168 overlap each other and retract to the outside of the opening window 160. In this way, an exposure opening having a panoramic field angle defined by the opening window 160 of the aperture frame 162 is defined.
Since the second and third light shielding frames 166 and 168 are retracted in this manner, the retreat space can be reduced and the lateral dimension of the camera can be reduced as compared with the case where the second light shielding frame 166 and 168 are overlapped. Can be small.
[0061]
When the screen switching knob 34 is set to the standard side, the first NP connecting lever 132 moves to the left side in the drawing as shown by the two-dot chain line in FIG. At this time, the click ball is removed from the click hole 180c, and the spring force of the tension springs 188 and 189 is released. Due to this spring force, the first light shielding frame 164 slides in the right direction in the drawing and advances to the position on the left side of the opening window 160 to the position (standard position) indicated by the two-dot chain line in the drawing. The light shielding frames 166 and 168 also slide in the left direction in the figure, and advance to the position on the right side of the opening window 160 to the position (standard position) indicated by the two-dot chain line in the figure.
[0062]
At this time, the second light shielding frame 166 slides more to the left than the third light shielding frame 168, and the second light shielding frame 166 and the third light shielding frame 168 work together to shield the right side portion of the opening window 160. As described above, the first to third light shielding plates 164, 166, and 168 project to the inside of the opening window 160 of the aperture frame 162, and the right end surface of the first light shielding frame 164, the left end surface of the second light shielding frame 166, The upper and lower sides of the opening window 160 define an exposure opening for exposing a standard-size frame. The standard size frame has, for example, a horizontally long quadrilateral shape of 36 mm × 24 mm.
[0063]
The click hole 180c is provided for the standard size and for the panorama size, but the operating force can be adjusted by changing the diameter of the hole in consideration of the larger spring force during panorama. it can.
Next, the electrical configuration of the camera will be described.
FIG. 10 is a block diagram showing an outline of the electrical configuration of the camera. The camera 1 includes a power supply system including a power battery 202, a DC / DC converter 204, and a peripheral power supply circuit 206, various operation input units 208 such as a main dial, a central processing unit (CPU) 210, and the like. The operation of the camera 1 is comprehensively controlled by the CPU 210.
[0064]
The DC / DC converter 204 is controlled by the CPU 210 and converts the power supply voltage of the battery 202 to a predetermined voltage value. The output of the DC / DC converter 204 is the voltage detection circuit 212, E ² It is guided to the PROM 214, the peripheral power supply circuit 206, and the like. The voltage detection circuit 212 detects the voltage value applied from the DC / DC converter 204 and notifies the CPU 210 of the detection result.
[0065]
The peripheral power supply control circuit 206 is controlled by the CPU 210 and supplies power to the film PR (photo reflector) detection circuit 216, the charge PR detection circuit 218, and the photometry circuit 220.
The operation switch of the operation input unit 208 includes an automatic lid switch indicating the open / close state of the back cover 44, the main dial 24, AEBSW 40, ELSW 41, S1 indicating half-press of the release button, cable release, midway rewind switch 42, panorama / There are a normal switch (PNSW), a self switch, an ISO dial 14, a shutter speed setting dial 26, an exposure correction dial (flacon dial), DX detection, and the like.
[0066]
The CPU 210 controls the shutter control circuit 222, the motor control circuit 224, the EL control circuit 226, the liquid crystal panel of the liquid crystal display unit (LCD) 228 and the like based on the signal input from the operation input unit 208, and the sequence written in the E2PROM 214. Controls a series of operations required for photography according to the program. Further, the CPU 210 refers to a signal obtained from a detection system such as the film PR detection circuit 216, the charge PR detection circuit 218, and the photometry circuit 220 for these operation controls.
[0067]
The film PR detection circuit 216 includes a photo sensor that detects the perforation of the film, and the photo sensor is disposed at an appropriate position in the film conveyance path between the cartridge chamber and the spool chamber and responds to the passage of the perforation. Output a signal.
The film PR detection circuit 216 detects the passage of perforation by counting the change in the output signal of the photosensor, and detects the amount of film movement when the film is fed or rewound. Note that the output signal from the photosensor changes twice from high to low and from low to high corresponds to the passage of one perforation.
[0068]
Then, the detection result is notified from the film PR detection circuit 216 to the CPU 210, and the movement amount of the film is grasped. For example, the length of a standard size frame is 8 perforations, and the length of a panorama size frame is 14 perforations.
The charge PR detection circuit 218 optically detects the mechanical position of the shutter and checks whether or not the shutter is set at a predetermined charge position.
[0069]
The photometry circuit 220 is controlled by the CPU 210 and measures the light incident on the camera via the photographing lens 2 based on the light reception signal of the light receiving element disposed in front of the shutter curtain, and notifies the CPU 210 of the photometry result.
The shutter control circuit 222 controls the opening and closing of the shutter 230 based on the setting of the shutter speed setting dial 26 and the photometric data from the photometric circuit 220, and adjusts the light emission timing of the synchro terminal or hot shoe indicated by reference numeral 240.
[0070]
The motor control circuit 224 is supplied with power from the battery 202 and controls a film transport motor (film motor) 232 and a charge motor 234 that drives a shutter curtain of a focal plane shutter based on a control signal from the CPU 210. .
The EL control circuit 226 turns on / off the backlight (EL) 236 of the liquid crystal display unit 36 based on a control signal from the CPU 210. Note that the EL control circuit 226 and the backlight 236 are directly supplied with power from the battery 202.
[0071]
In addition, the CPU 210 controls the display of the liquid crystal display unit 36 and controls the lighting of the light-emitting diode (LED) 242 in the self-lamp and the viewfinder. Note that the power of the light emitting diode is supplied from the battery 202.
Next, the operation of the camera configured as described above will be described.
When the lens barrel of the photographic lens 2 with f = 90 mm is mounted on the mount of the camera 1, the claw 99 of the lens barrel 6 pushes down the protruding piece 91d of the fifth connecting member 91 as described in FIG. 91 moves downward as indicated by a two-dot chain line in FIG. Then, in conjunction with the downward movement of the fifth connecting member 91, the sixth connecting member 94 swings counterclockwise about the shaft 100, and the second connecting member 84 shown in FIG. Turn in the turning direction.
[0072]
Since the distal end of the arm portion of the second connecting member 84 is connected to the first connecting member 80 via the connecting pin 80b, when the second connecting member 84 rotates in the clockwise direction, the first connecting member 80 rotates clockwise. Rotate in the direction. As a result, the arm portion 80a of the first connecting member 80 moves to a position (90 mm position) indicated by a two-dot chain line in the drawing, and the 45 mm eyepiece lens group 64 and the 90 mm eyepiece lens group 66 extend along the guide grooves 78a and 78b. And slide right.
[0073]
At this time, the boss 68a of the lens frame 68 holding the 45mm eyepiece group 64 is regulated by the L-shaped guide groove 78a, bent in the forward direction of the camera, and retracted from the viewfinder optical axis. By folding and retracting in this way, the lateral dimension of the camera can be reduced as compared with the case where the both eyepiece lens groups are translated in parallel without being bent.
[0074]
On the other hand, the 90 mm eyepiece group 66 moves in the left direction in the drawing along the guide groove 78b and advances into the finder optical axis. In this way, the eyepiece lens for 90 mm can be switched.
Further, the fourth connecting member 88 shown in FIG. 5 moves downward in FIG. 5 by the lens mounting operation of f = 90 mm, and the lever portion 88d of the fourth connecting member 88 moves to 45 mm / 90 mm described in FIG. The switching frame 110 is driven. As the 45 mm / 90 mm switching frame 110 moves, a 90 mm frame 260 appears in the viewfinder as shown in FIGS. 11A and 11B, and the screen switching knob 34 is selected inside the frame 260. A frame 262 of the selected screen size is displayed.
[0075]
FIG. 11 shows an example of the field of view observed from the eyepiece when the 90 mm lens is mounted. FIG. 11A shows the panorama size at infinity, and FIG. 11B shows the panorama size near (1 m). is there.
When the panorama size is selected by operating the screen switching knob 34, the first NP connecting lever 132 moves to the left position shown by the solid line in FIG. 8 as described in FIG. It rides on the flat portion 132d of the 1NP connecting lever 132.
[0076]
Accordingly, the NP switching frame 108 shown in FIG. 7 is moved in the diagonally upper left direction in FIG. 7 by the pin 128 fixed to the elevating member 144, and the viewfinder has a panoramic view as shown in FIGS. 11 (a) and 11 (b). Frame 262 is displayed.
When the distance ring 20 of the lens barrel 6 is turned, the moving frame 104 is moved diagonally by the lever 120 as described with reference to FIG. 7, and the distance is increased as shown in FIGS. 11 (a) and 11 (b). At the same time, the parallax correction is automatically performed.
[0077]
On the other hand, when the standard size is selected by operating the screen switching knob 34, the first NP connecting lever 132 moves to the right side position shown by the two-dot chain line in FIG. The pin 148 descends along the slope portion 132c of the first NP connection lever 132.
Accordingly, the NP switching frame 108 shown in FIG. 7 is moved diagonally downward to the right in FIG. 7 by the pin 128 fixed to the elevating member 144, and the viewfinder is for standard use as shown in FIGS. 12 (a) and 12 (b). Frame 264 is displayed.
[0078]
FIG. 12A shows the standard size at infinity, and FIG. 12B shows the standard size close to 1 m, which is automatically linked to the turning operation of the distance ring 20 of the lens barrel 6. The point where the parallax correction is performed is the same as in the examples of FIGS. 11A and 11B.
Next, a case where the lens barrel of the photographing lens 2 with f = 45 mm is attached to the mount of the camera 1 will be described.
[0079]
The lens barrel of the photographic lens 2 with f = 45 mm does not have the claw 99 that engages with the fifth connecting member 91 shown in FIG. 6, and therefore when the lens with f = 45 mm is attached to the mount of the camera 1 As shown by the solid line in FIG. 6, the fifth connecting plate 91 moves upward.
Then, in conjunction with the ascending operation of the fifth connecting member 91, the sixth connecting member 94 swings clockwise about the shaft 100, and the second connecting member 84 shown in FIG. Turn in the direction of rotation.
[0080]
When the second connecting member 84 is rotated in the counterclockwise direction, the first connecting member 80 is rotated in the counterclockwise direction, and the arm portion 80a of the first connecting member 80 is at a position (45 mm position) indicated by a solid line in the drawing. Move to. By this operation, the 45-mm eyepiece group 64 and the 90-mm eyepiece group 66 slide to the left along the guide grooves 78a and 78b, and the 45-mm eyepiece group 64 advances into the finder optical axis and is used for 90-mm. The eyepiece group 66 translates leftward in the drawing along the guide groove 78b and retracts from the viewfinder optical axis. At this time, the 90-mm eyepiece lens group 66 is retracted to a space behind the target lens group 58. Thus, the eyepiece lens for 45 mm is switched.
[0081]
Thus, by connecting the 45-mm eyepiece group 64 and the 90-mm eyepiece group 66 in parallel and partially overlapping the slide paths of both, the movable area of the lens can be saved.
Further, the fourth connecting member 88 shown in FIG. 5 is moved upward in FIG. 5 by the lens mounting operation of f = 45 mm, and the 45 mm / 90 mm described in FIG. The switching frame 110 is driven. As the 45 mm / 90 mm switching frame 110 moves, a 45 mm frame 266 appears in the viewfinder as shown in FIGS. 13A and 13B, and the screen switching knob 34 is selected inside the frame 266. A frame 268 of the selected screen size is displayed.
[0082]
FIGS. 13 and 14 show examples of the field of view observed from the eyepiece when the 45 mm lens is mounted. FIG. 13A shows a panoramic size at infinity, and FIG. FIG. 14A shows the standard size at infinity, and FIG. 14B shows the standard size close to (0.75 m).
The point that the displayed frame is switched by the setting of the screen size by the screen switching knob 34 and the point that the automatic parallax correction is performed in conjunction with the operation of the distance ring 20 of the lens barrel 6 are shown in FIGS. This is the same as the example described.
[0083]
Next, the camera control procedure will be described.
FIG. 15 is a flowchart showing the flow of camera operation control. When the main power is turned on and the camera operation is started (step S10), hardware initialization processing is performed (step S12). ² Initial data is read from the PROM 214 (step S14). Next, a RAM capacity check (step S16) and a battery check process are executed (step S18).
[0084]
As a result of the battery check, when it is determined that the remaining amount of energy is less than the predetermined value (battery NG), the process proceeds to processing such as a warning or stop of the camera operation, and the remaining energy is determined to be greater than or equal to the predetermined value. In the case (battery OK), the liquid crystal display unit 36 is turned on (step S20), and the 5-minute timer starts counting.
[0085]
Next, the state of various input switches of the camera is read (step S22). Specifically, it is first determined whether or not the main dial 24 has changed (step S24). When the main dial 24 is operated to change the mode setting content, a mode setting process corresponding to the setting is executed (step S26). Then, after the mode setting process, the 5-minute timer is reset (step S66). In step S66, after resetting the 5-minute timer, the process returns to step S22.
[0086]
On the other hand, if there is no change in the mode setting of the main dial 24 in step S24, it is subsequently confirmed whether or not the main dial is turned off (step S28). If the main dial 24 is turned off, the process jumps to step S70. The processing after step S70 will be described later.
If the main dial 24 is ON in step S28, it is subsequently determined whether or not there is a change in the attobut switch (step S30). The automatic lid switch detects whether or not a film is loaded. When the film cartridge is loaded in the cartridge chamber, the switch is turned on. When the cartridge is not loaded, the switch is turned off.
[0087]
If there is a change in the attobut switch, the operation goes to the attobut switch processing (step S32), and processing according to the switch state is performed. In other words, when the atto-pull switch is OFF, the at-to-pick detection flag is set to 0, and a warning is displayed on the liquid crystal display unit 36 that the film is not loaded, and the camera operation such as the shutter operation is prohibited.
[0088]
On the other hand, in the case of the at-push switch ON, the at-pick detection flag is set to 1 to allow camera operation. When the automatic pig switch process in step S32 ends, the process proceeds to step S66.
If there is no change in the attobut switch in step S30, it is then determined whether or not there is a change in S1 indicating half-press of the shutter (step S34). When the release button 22 is pressed by a predetermined amount, S1 is turned ON and the process proceeds to S1 processing (step S36). In this S1 process, a series of photographing operations including photometry, shutter opening / closing, and single frame feeding are executed. When the S1 process ends, the process proceeds to step S66.
[0089]
If there is no change in S1 in step S34, it is then determined whether or not the cable release has changed (step S38). When the cable release is turned on, the process proceeds to the cable release process (step S40), and a series of photographing operations are executed in the same manner as the S1 process (step S36). Then, after executing the predetermined operation, the process proceeds to step S66.
[0090]
If there is no change in the cable release in step S38, it is then determined whether or not the ELSW 41 has changed (step S42). When the ELSW 41 is pressed, the process proceeds to ELSW processing (step S44), and the backlight on / off control of the liquid crystal is performed. That is, the backlight is turned on in response to the ON operation of the ELSW 41, and the backlight is turned off after a predetermined time has elapsed since the lighting. Note that the backlight may be turned off in response to the ELSW 41 being turned off. When the ELSW process ends, the process proceeds to step S66.
[0091]
If there is no change in ELSW in step S42, then it is determined whether or not MUSW 42 has changed (step S46). When the MUSW 42 is pressed, the process proceeds to the MUSW process (step S48), and the film is forcibly rewound. When the MUSW process ends, the process proceeds to step S66.
If there is no change in MUSW in step S46, then it is determined whether or not AEBSW 40 has changed (step S50). When the AEBSW 40 is pressed, the process proceeds to AEBSW processing (step S52), and the auto bracket mode is set. When the AEBSW process ends, the process proceeds to step S66.
[0092]
If there is no change in AEBSW in step S50, then it is determined whether or not there is a change in PNSW (step S54). When the PNSW is pressed, the process proceeds to PNSW processing (step S56). Although details of the PNSW process will be described later (FIG. 17), various processes corresponding to the selected screen size are performed.
If there is no change in the PNSW in step S54, then it is determined whether or not there is a change in the flat control dial (step S58). When the flap control dial is turned, the process shifts to the dial control processing (step S60), and the selected flag control shift amount is set. When the FLA dial process is completed, the process proceeds to step S66.
[0093]
If there is no change in the flat control dial in step S58, it is then determined whether or not the shutter speed setting dial (SS dial) 26 has changed (step S62). When the SS dial is operated, the process proceeds to SS dial processing (step S64), and the selected shutter speed is set. When the SS dial process ends, the process proceeds to step S66, and after resetting the 5-minute timer, the process returns to step S22.
[0094]
If there is no change in the SS dial in step S62, then the 5-minute timer count is checked to determine whether 5 minutes have passed (step S68). If less than 5 minutes, the process proceeds to step S22. Return. On the other hand, if it is confirmed in step S68 that 5 minutes have elapsed, or if the main dial is turned off in step S28 described above, the start switch a is turned off (step S70) and then restarted. The condition set is performed (step S72).
[0095]
The start switch a means S1, cable release switch, MUSW, and ELSW. In step S70, it is confirmed that all these switches are off, and then the process proceeds to step S72.
The activation conditions set in step S72 are the activation conditions when the main dial 24 is activated from the OFF state: the main dial 24 ON, the automatic lid switch ON, and the MUSW 42 OFF, and the activation from the standby state. In addition to the above three conditions, the activation condition is that any one of S1, the cable release switch, the MUSW 42, and the ELSW 41 is ON (the activation switch a is ON).
[0096]
When the activation condition setting is completed in step S72, the EL and LCD are turned off (step S74), and the control operation is stopped (step S76).
FIG. 16 shows the flow of activation processing from the stopped state in step S76 shown in FIG.
For restart from the stop state, all switch states are read (step S80), and it is determined whether or not the start condition set in step S72 of FIG. 15 is satisfied (step S82).
[0097]
When the main dial 24OFF is received and the stop state is entered in step S28 shown in FIG. 15, it is determined whether or not the activation condition from the main dial OFF is satisfied. On the other hand, when the main dial is turned on and the stop state is reached after 5 minutes, it is determined whether or not the activation condition from standby is satisfied.
If the corresponding activation condition is satisfied, the LCD is turned on (step S84), the 5-minute timer is started, and the process returns to step S22 shown in FIG. On the other hand, if the corresponding activation condition is not satisfied in step S82, the process returns to step S70 shown in FIG. 15, and the stopped state is maintained (step S76).
[0098]
Subsequently, a subroutine of the PNSW process shown in FIG. 15 will be described.
FIG. 17 is a flowchart showing the flow of the PNSW process. When the PNSW process is started (step S100), first, it is determined whether or not the PNSW corresponding to the screen switching knob 34 is in a neutral state, that is, an incomplete setting state between the panorama setting position and the standard setting position. (Step S102). When the PNSW is in a neutral state, “P” blinks on the liquid crystal display unit 36 to give a warning that the screen size setting has not been established (step S104), and the process returns to the main routine of FIG. 15 (step S104). S116).
[0099]
If the PNSW is not in the neutral state in step S102, then the screen size selected and set by PNSW is determined (step S106). When the panorama size is selected (when the standard size is switched to the panorama size), it is determined whether or not the remaining amount of the film at the standard size (normal) before switching is “1” (step S108). If the normal film remaining amount is one, it is determined that panorama shooting cannot be performed, and “1” is displayed blinking on the film counter 28 (step S110), and a warning that panorama shooting is not possible is displayed. The process returns to the main routine of FIG. 15 (step S116).
[0100]
In step S108, panorama shooting is possible if the normal remaining film amount is 2 or more, and an “N → P switching process” to be described later is executed (step S112). Thereafter, the process returns to the main routine of FIG. 15 (step S116).
When the PNSW is set to the standard size side in step S106 (that is, when the panorama is switched to normal), a “P → N switching process” described later is executed (step S114). Thereafter, the process returns to the main routine of FIG. 15 (step S116).
[0101]
FIG. 18 shows a subroutine for screen size switching processing.
When the screen size switching process starts (step S120), first, it is determined whether the PNSW is set to the panorama side or the standard side (step S122). If it is set to the panorama side (corresponding to the N → P switching process shown in step S112 of FIG. 17), “6” is set in the photoreflector register (PRreg) (step S124). Since the signal change of the film PR detection circuit 216 corresponds to one perforation passage in two times, “6” is a value corresponding to three perforations.
[0102]
Thereafter, counting of the safety timer is started (step S126), and rewinding driving of the film motor 232 is started (step S128). The safety timer is set to time up in 90 seconds, for example.
During the film rewinding operation, the CPU 210 of the camera monitors the change in the signal state from the film PR detection circuit 216 (step S130), and subtracts 1 from the value of PRreg for each change (step S132). The processes in steps S130 and S132 are repeated until the value becomes 0 (step S134).
[0103]
However, if the state does not change in step S130, it is confirmed whether or not the safety timer has reached time-up (step S136). If the time has not yet expired, the process returns to step S130. The process proceeds to step S138.
When the safety timer expires in step S136, or when the film is fed for three perforations and the value of PRreg becomes "0", the film motor 232 is turned off and the film transport is ended (step S138). Then, after exciting both poles of the motor 232 and applying a brake (step S140), the motor 232 is deenergized (step S142). Thereafter, the safety timer is reset (step S144), and the process returns to the main routine of FIG. 15 (step S146).
[0104]
Next, the case where the standard side is set in step S122 will be described. When PNSW is set to the normal side, this corresponds to the “P → N switching process” shown in step S114 of FIG. 17, and in this case, PRreg is set to 10 (step S150). “10” is a value corresponding to 5 perforations.
Thereafter, counting of the safety timer is started (step S152), and the feed driving of the film motor 232 is started (step S154).
[0105]
During the film feeding operation, the CPU 110 of the camera monitors the change in the signal state from the film PR detection circuit 216 (step S156), and subtracts 1 from the value of PRreg for each change (step S158). The processes of steps S156 and S158 are repeated until becomes 0 (step S160).
However, if the state does not change in step S156, it is checked whether or not the safety timer has reached time-up (step S162). If the time has not yet expired, the process returns to step S156, and when the time is up, The process proceeds to step S164.
[0106]
When the safety timer expires in step S164, or when the film is wound on the take-up reel by 5 perforations and the value of PRreg becomes “0” (step S160), the film motor 232 is turned off and the film is conveyed. Is finished (step S164). Then, after applying the brakes by exciting both poles of the motor 232 (step S166), the power supply to the motor 232 is cut off (step S168).
[0107]
Thereafter, PRreg is set to “4” (step S170), the safety timer is reset (step S172), and the process proceeds to step S126. The processing from step S126 to step S148 is as described above, and the film is rewound by two perforations.
In this way, even when switching from panorama to standard, film positioning is always performed in one direction (film rewinding direction), and the effects of transport errors due to backlash of the film driving force transmission mechanism and detection errors of the perforation detection means Is avoiding.
[0108]
Next, a single frame feeding process after shooting will be described.
FIG. 19 shows a subroutine for one frame feeding (one frame rewinding). When the film exposure is performed and the one-frame feeding process is started (step S180), it is first determined whether the PNSW is set to panorama / standard (step S182). If PNSW is set to the panorama side, “28” is set to PRreg (step S184). “28” is a value corresponding to 14 perforations.
[0109]
On the other hand, if PNSW is set to the normal side in step S182, PRreg is set to “16”. “16” is a value corresponding to 8 perforations.
Thereafter, counting of the safety timer is started (step S188), and rewinding driving of the film motor 232 is started (step S190).
[0110]
During the film feeding operation, the CPU 110 of the camera monitors the change in the signal state from the film PR detection circuit 216 (step S192), and subtracts 1 from the value of PRreg for each change (step S194). Steps S192 and S194 are repeated until becomes 0 (step S196).
However, if the state does not change in step S192, it is checked whether or not the safety timer has reached the time-up (step S198). If the time has not yet expired, the process returns to step S192. Proceed to step S200.
[0111]
If the safety timer expires in step S198, or if the film is transported by a predetermined amount in step S196 and the value of PRreg becomes "0", the film motor 232 is turned off and the film transport is terminated (step S200). Then, after exciting both poles of the motor 232 and applying a brake (step S202), the power supply to the motor 232 is cut off (step S204). Thereafter, the safety timer is reset (step S206), and the process returns to the main routine of FIG. 15 (step S208).
[0112]
Next, processing when the remaining film amount becomes 0 after shooting in panorama will be described.
As shown in FIG. 20, when the film feeding process is executed after performing panoramic film exposure (step S220), it is determined whether the remaining film amount is 1 or less in terms of standard size (step S222). . If the normal film remaining amount is 1 or less, it is determined that panoramic photography cannot be performed, and the process proceeds to processing step S110 shown in FIG. That is, “1” blinks on the film counter 28 to warn that panoramic photography is impossible.
[0113]
On the other hand, even if the remaining number in the panorama is 0, if it is determined in step S222 that shooting at the standard size is possible, even if the panorama is set, the standard size one frame is automatically rewound. A process is executed (step S224) to effectively use the film.
In the above-described embodiment, the prewinding camera is described as an example in which the preliminary winding is performed immediately after the film cartridge is loaded, and the film is stored in the cartridge every time one frame is shot. The present invention can also be applied to a camera that sends out a film from a cartridge.
[0114]
In the above-described embodiment, the example in which the present invention is applied to a standard / panorama switching camera that can be switched between a standard size and a panorama size obtained by expanding the standard size in the film traveling direction has been described. The present invention can also be applied to a camera that defines the panorama size by shielding the upper and lower portions of the image, and a camera that can be switched between full size and half size.
[0115]
【The invention's effect】
As described above, according to the camera capable of switching the screen size according to the present invention, the light shielding member that covers at least a part of the exposure opening and expands / contracts the opening area is configured by a plurality of light shielding plates, and at least two light shieldings are performed. Since the portions of the plates are overlapped with each other and retracted to the outside of the exposure opening, the retracting space for the light shielding member can be reduced. Thereby, size reduction of a camera can be achieved.
[0116]
In addition, the present invention is particularly effective when applied to a camera in which the size of a photo frame exposed on a film can be switched between a standard size and a panorama size obtained by expanding the standard size in the film traveling direction.
In other words, a panoramic size exposure opening is formed in the aperture, and the left and right sides of the panorama size exposure opening can be shielded by the light shielding member, thereby retracting the light shielding member in the film traveling direction (lateral direction of the camera). Space can be reduced and the lateral dimensions of the camera can be reduced.
[Brief description of the drawings]
FIG. 1 is a front external view of a camera according to an embodiment of the present invention.
FIG. 2 is a top view of the camera shown in FIG.
3 is an external view of the rear side of the camera shown in FIG.
4 is a plan view showing a configuration of an optical system of a finder incorporated in the camera shown in FIG.
FIG. 5 is a plan view of an eyepiece lens group switching mechanism;
FIG. 6 is a main part configuration diagram of the front side of the switching mechanism of the eyepiece lens group.
7 is a diagram showing a configuration of reticle group 56 shown in FIG. 4;
FIG. 8 is a main part configuration diagram inside the camera shown in FIG. 1;
FIG. 9 is a configuration diagram of an aperture switching mechanism.
FIG. 10 is a block diagram showing an outline of the electrical configuration of the camera.
FIGS. 11A and 11B are diagrams illustrating an example of a visual field observed from an eyepiece when a 90 mm lens is mounted, where FIG. 11A illustrates a panorama size at infinity, and FIG. 11B illustrates a panorama size close view; Illustration
FIGS. 12A and 12B are diagrams showing an example of a field of view observed from an eyepiece when a 90 mm lens is mounted, FIG. 12A is a diagram showing a state of a standard size at infinity, and FIG. Illustration
FIGS. 13A and 13B are diagrams illustrating an example of a visual field observed from an eyepiece when a 45 mm lens is mounted, FIG. 13A is a diagram illustrating a state of panoramic size at infinity, and FIG. Illustration
FIGS. 14A and 14B are diagrams illustrating an example of a visual field observed from an eyepiece when a 45 mm lens is mounted, FIG. 14A is a diagram illustrating a state of infinity of a standard size, and FIG. Illustration
FIG. 15 is a flowchart showing the flow of camera operation control.
FIG. 16 is a flowchart showing a flow of activation processing from a stopped state;
17 is a flowchart showing the flow of the PNSW process shown in FIG.
FIG. 18 is a flowchart showing a subroutine for screen size switching processing;
FIG. 19 is a flowchart showing a subroutine for frame advance.
FIG. 20 is a flowchart used for explaining the process of remaining amount 0 after panoramic shooting.
[Explanation of symbols]
1 ... Camera
2 ... Lens
34 ... Screen switching knob
132 ... 1st NP connecting lever
160 ... Open window (opening for exposure)
162 ... Aperture frame
164 ... 1st shading frame
166 ... Second light shielding frame
168 ... Third light shielding frame
180 ... 2nd NP connecting lever

Claims (3)

In a camera that can change the size of the shot frame exposed on the film,
An aperture in which an opening for exposure is formed;
A light-shielding member that is movable in and out of at least a part of the opening for exposure, and includes at least two light-shielding plates that are movable in a plane parallel to the aperture surface of the aperture; And a light shielding member configured to shield a part of the opening for exposure and to overlap a part of at least two light shielding plates and to retreat outside the opening for exposure ,
A lever that moves with the shading plate;
Urging means for urging the lever in the moving direction;
A click hole formed on the lever corresponding to a fixed position of the light shielding plate, and having a different diameter depending on the urging force applied to the lever by the urging means,
A fixing means that fits into the click hole and fixes the lever and the light shielding plate at the fixed position;
Screen size switchable camera, characterized in that it comprises a.   2. The camera capable of switching the screen size according to claim 1, further comprising a focal plane shutter. A camera capable of switching between a standard size and a panorama size obtained by extending the standard size in the film traveling direction, for the size of a shooting frame exposed on the film,
The aperture for the panorama size is formed in the aperture, and the light shielding member is disposed so as to shield at least one of the left and right portions of the panorama size exposure opening ,
The click hole is formed at a retracted position of the light shielding plate and a position where a part of the aperture is shielded by the light shielding plate to define the exposure opening for the standard size. Item 1 or 2 screen size switchable camera.

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