JP2006301198A - Lens-fitted film unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce the color tone of an image obtained in shooting by the color tone of a subject in shooting even in the case of inexpensive configuration. <P>SOLUTION: A photo film built in a lens-fitted photo film unit is made of a color reversal film. It is made possible to switch over a diaphragm between a small diaphragm (F22.4) and a large diaphragm (F5.6), and it is made also possible to switch over a shutter speed between a high shutter speed (1/180 s) and a low shutter speed (1/45 s). Shooting in a range from EV7.5 to EV15.5 is therefore allowed, and in daylight shooting, the color toner of a subject can be reflected in the color toner of a photograph as it is. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens-fitted photo film unit capable of adjusting an exposure amount at the time of photographing by switching an aperture value and a shutter speed.

  Generally, after taking a photographed subject image as image data, the digital camera that stores the image data in a storage medium such as a RAM housed in the camera body, or a photographic film set in the camera body is exposed to the subject light. A silver halide camera or the like for storing an image is provided.

  For example, in the case of a digital camera, for example, the image data obtained at the time of shooting or the image data stored in the above-described storage medium is displayed on a display device such as an LCD provided in the camera body, or the camera body is used as an external monitor. By connecting, by displaying the image data stored in the storage medium described above, it is possible to view an image obtained by photographing using a digital camera. In addition to this, printing using the obtained image data can be performed, and an image obtained by photographing from the printed photograph can be browsed, which is convenient.

  On the other hand, in the case of a silver halide camera, in addition to a camera that can shoot by exchanging with a new photo film after taking a number of shots corresponding to a predetermined number of frames, the photo film can be exchanged. In other words, a lens-fitted photo film unit is provided in which, after a predetermined number of times of photographing, no further photographing can be performed. Recently, the above-mentioned digital cameras have become widespread, and the demand for silver halide cameras as a whole has decreased. However, the demand for film units with lenses can be easily taken and is low, so that demand is maintained. ing.

This lens-fitted photo film unit is provided with a shutter that shields the exposure opening and retracts from a position that shields the exposure opening in accordance with the release operation of the photographer, and the subject captured from the photographing lens by retracting the shutter. The light passes through the exposure opening, and the film set at the photographing position is exposed. Recently, a lens-fitted photo film unit that can switch the exposure level has been provided (Patent Document 1).
JP 2004-85620 A

  However, when shooting with a lens-equipped film unit that can switch the exposure level according to the shooting conditions, the exposure will be insufficient if the subject's brightness is low, and the subject will be exposed to strobe light. To solve the shortage of exposure. For this reason, when a photograph is created from the exposed film, the obtained image tends to have a color tone different from the color tone at the time of shooting, and there is a problem that the reproducibility is poor. In order to solve such problems, for example, it may be possible to adjust the color tone when developing the exposed film, but advanced techniques are required to reproduce the color tone of the subject at the time of shooting. Another problem is that adjustment time is required.

  The present invention has been made in order to solve the above-described problems, and has a lens-equipped film that can reproduce the color tone of an image obtained at the time of shooting with the color tone of the subject at the time of shooting, even with an inexpensive configuration. The purpose is to provide units.

  The lens-fitted photo film unit of the present invention includes a shutter that opens an exposure opening in response to a release operation, and a diaphragm that adjusts the amount of light of the captured subject light. In a film unit with a lens that exposes an unexposed photographic film through an exposure aperture, the photographic film is a reversal film, and the aperture is between a large aperture and a small aperture. Aperture switching means for switching, a shutter speed switching means for switching the shutter speed between a high shutter speed and a low shutter speed, a shutter speed to a high shutter speed by the shutter speed switching means, and a small aperture by the aperture switching means. In the first shooting mode with an aperture, the shutter speed switching means A second shooting mode in which the shutter speed is set to a low shutter speed, the aperture switching means sets the aperture to a small aperture, the shutter speed switching means sets the shutter speed to a high shutter speed, and the aperture switching means sets the aperture to a large aperture. Shooting mode selection operation operated to select one of the fourth shooting modes in which the shutter speed is switched to a low shutter speed by the shutter speed switching unit and the aperture is set to a large aperture by the aperture switching unit. Means.

  The film sensitivity of the reversal film is ISO400.

Further, when the aperture value of the small aperture is F ₁ and the aperture value of the large aperture is F ₂ , F ₁ = 22 and F ₂ = 5.6 are satisfied.

Further, when the high shutter speed is T ₁ and the low shutter speed is T ₂ , T ₁ = 1/180 seconds and T ₂ = 1/45 seconds are satisfied.

  And a strobe device that emits strobe light in response to the previous release operation, and strobe selection operation means that is operated to select whether or not to emit strobe light in conjunction with the release operation, The photographing mode selection operation means and the strobe selection operation means are provided separately.

  According to the lens-fitted photo film unit of the present invention, the shutter includes a shutter that opens the exposure aperture in response to a release operation, and a diaphragm that adjusts the amount of light of the captured subject light. In a film unit with a lens that exposes unexposed photographic film through an exposure opening with subject light whose light amount has been adjusted by the diaphragm, the photographic film is a reversal film, and the diaphragm is composed of a large diaphragm and a small diaphragm. A diaphragm switching means for switching between, a shutter speed switching means for switching the shutter speed between a high shutter speed and a low shutter speed, a shutter speed to a high shutter speed by the shutter speed switching means, and a diaphragm by the diaphragm switching means. In the first shooting mode with a small aperture, the shutter speed switching means A second shooting mode in which the shutter speed is set to a low shutter speed, the aperture switching means sets the aperture to a small aperture, the shutter speed switching means sets the shutter speed to a high shutter speed, and the aperture switching means sets the aperture to a large aperture. Shooting mode selection operation means operated to select one of the four shooting modes in which the shutter speed is changed to the low shutter speed by the shutter speed switching means and the aperture is set to the large aperture by the aperture switching means. Since the exposure amount in the multi-step shooting mode can be kept within the appropriate exposure range, the color tone of the photograph based on the captured image can be changed to the color tone of the subject image at the time of shooting with an inexpensive configuration. Can be reproduced as a high-quality photograph.

  And a strobe device that emits strobe light in response to the release operation, and strobe selection operation means that is operated to select whether or not to emit strobe light in conjunction with the release operation. Since the mode selection operation means and the strobe selection operation means are provided separately, for example, the strobe light emitted at the time of shooting is used for shadowing or the like. Can be reflected in the obtained image.

  FIG. 1 is a perspective view showing the external shape of a lens-fitted photo film unit embodying the present invention. This lens-fitted photo film unit basically uses natural light for shooting, and uses a strobe device to be described later when performing daytime synchro shooting or the like. The lens-fitted photo film unit 10 includes a unit main body 11 in which a photographing mechanism is incorporated, and a label 12 that is attached so as to be wound around the outer periphery of the unit main body 11. The label 12 has an opening for exposing each part of the unit main body 11.

  On the front surface of the unit main body 11, a photographing lens 15, a finder 16, a strobe light emitting unit 17, a strobe selecting unit 18, an exposure switching unit 19, and the like are provided. On the upper surface of the unit body 11, a release button 20, a counter display window 21, a signal opening 22 and the like are provided. A part of the winding knob 23 used for winding the film after photographing is exposed from the back of the unit main body 11.

  The strobe selection unit 18 includes an operation opening 25 provided on the front surface of the unit main body 11 and a substantially oval operation unit 26 that is movable within the operation opening 25. The operation member 26 is movable between an off position where the strobe light is not emitted as shown in FIG. 1 and an on position slid upward from the off position. Note that when the release button 20 is operated when the operation unit 26 is located at the on position, strobe light is emitted from the strobe light emitting unit 17 toward the subject. When the operation unit 26 is slid to the ON position, a part of the light guide (not shown) protrudes from the signal opening 22 provided on the upper surface of the unit body 11. This light guide is for guiding the light of the light emitting element that emits light when the strobe power reception is completed toward the outside of the unit body 11.

  The exposure switching unit 19 includes a rectangular operation opening 27 provided on the front surface of the unit main body 11 and a rectangular parallelepiped operation unit 28 that is movable within the operation opening 27. The operation portion 28 is slidably provided in the direction A or B in the drawing, and the operation opening 27 has a first position indicated by a solid line in FIG. 1, a second position indicated by a dotted line in FIG. 1, and two in FIG. It is movable between a third position indicated by a dotted line and a fourth position indicated by a one-dot chain line in FIG.

  When the operation unit 28 is in any position from the first position to the fourth position, the link pin 65c of the switching ring 65 that is pressed in the S direction in FIG. Even if the operation is received, the operation unit 28 is held so as not to move. Further, when the operation unit 28 is in the first position or the third position, the details will be described later, but when the rotation prevention piece 47a of the shutter blade 45 is brought into contact with the stopper 78 of the top member 75, In response to the impact, the operation unit 28 is held so as not to move. As a method of securely holding the operation unit 28 at each position, for example, a locking projection is provided on the exposure switching member 85 described later, and a plurality of engaging portions that engage with the locking projection are provided on the front cover 34. When the operation unit 28 is positioned at each of the first to fourth positions, it is conceivable to engage the locking protrusion with any of the plurality of engaging units.

  When the operation unit 28 is in the first position, a small aperture and a high-speed shutter are selected, and the first shooting mode is set, for example, in sunny daytime and outdoor shooting. When the operation unit 28 is in the second position, the small aperture and the low-speed shutter are selected, and the second shooting mode is set, for example, in cloudy day and outdoor shooting. When the operation member 28 is in the third position, a large aperture and a high-speed shutter are selected, and a third shooting mode is set, for example, when shooting outdoors on a rainy day or shooting in the evening. Further, when the operation unit 28 is in the fourth position, the large aperture and the low-speed shutter are selected, and the fourth shooting mode for performing indoor shooting in a dome, a gymnasium, a bright event hall, or the like is set.

  FIG. 2 is an exploded perspective view showing the configuration of the unit main body 11. The unit main body 11 includes a main body base 31 to which the film cartridge 30 is loaded, a strobe device 32 attached to the front side of the main body base 31, and a front cover 34 and a rear cover attached to the front side and the rear side of the main body base 31. 35.

  The film cartridge 30 includes a cartridge 30a and a photographic film 30b, and is loaded at the time of manufacture as described above. As the photographic film 30b, a color reversal film having a film sensitivity of ISO400 is used. This color reversal film has the advantages of superior color (hue, tone) reproducibility, light (hardness and softness of light), and contrast compared to a color negative film. .

  The strobe device 32 includes a printed circuit board on which various electric components are attached and a strobe circuit is formed, and a strobe light emitting unit 17 including a discharge tube, a reflector, a diffusion plate, and the like. Further, the printed circuit board is turned on in conjunction with the release button 20 being pressed, and a sync switch that emits strobe light, and a metal that constitutes a charge switch that is turned on / off by the movement of the operation member 26 of the strobe selection unit 18. A contact piece or the like is attached. Although not described in detail, the synchro switch is turned on by a pressing piece 46d provided on the shutter blade 45 when a shutter blade 45 described later rotates. At this time, when the operation unit 26 of the strobe selecting unit 18 is in the on position, strobe light is emitted from the strobe light emitting unit 17 toward the subject.

  A light shielding cylinder 40 (see FIG. 3) is provided at the approximate center of the front surface of the main body base 31. A shutter charge mechanism, a shutter release mechanism, an aperture switching mechanism, a shutter speed switching mechanism, a photographing optical system, a finder optical system, and the like are incorporated around the light shielding cylinder 40.

  FIG. 3 is an exploded perspective view showing configurations of a shutter release mechanism, an aperture switching mechanism, a shutter speed switching mechanism, and a photographing optical system incorporated around the light shielding cylinder 40. A rectangular exposure opening 41 is formed in the front surface of the light shielding tube 40. On the side of the light shielding tube 40, a pin 42 for swingably supporting the shutter blade 45 and a pin 43 on which one end of a spring 49 is hung are provided. The spring 49 urges the shutter blade 45 in the direction C in FIG.

  The shutter blade 45 constituting the shutter mechanism includes a base portion 46 in which a hole 46a inserted into the pin 42 is formed, a blade portion 47 that is disposed in front of the exposure opening 41 and opens and closes the exposure opening 41, and a base. It comprises a connecting part 48 that connects the part 46 and the blade part 47. The base portion 46 is provided with a pin 46 b on which the other end of the spring 49 is hooked and a protruding portion 46 c kicked by the shutter drive lever 50. The shutter blade 45 is held in a closed position that is biased by a spring 49 and closes the exposure opening 41. Then, when the shutter drive lever 50 is rotated in the direction D in FIG. 3 by the pressing operation of the release button 20, the protruding portion 46c of the shutter blade 45 is kicked off. The shutter blade 45 kicked by the shutter drive lever 50 rotates against the bias of the spring 49 (in the direction F in FIG. 8), and after the exposure opening 41 is fully opened, the shutter blade 45 is closed by the bias of the spring 49. (In the G direction in FIG. 8). Reference numeral 47a denotes a rotation preventing piece, which comes into contact with the rotation preventing piece 47a when a stopper 78, which will be described later, is at the high speed shutter position.

A cylindrical lens barrel 51 is formed at the center of the front surface of the lens holder 50. An opening 52 is formed in the lens barrel 51, and a notch 53 is formed on the side surface of the lens barrel 51. In the lens barrel 51, a first lens 55 and a second lens 56 constituting the photographing lens 5 are housed. Between the first lens 55 and the second lens 56, an insertion space for the aperture switching plate 60 is secured, and a spacer 58 having an aperture opening (hereinafter referred to as a large aperture aperture) 58a formed in the center thereof is accommodated. . The large aperture 58a is a made of a large aperture, the aperture value F ₂ is its diameter is determined such that F ₂ = F5.6.

  A lens holding plate 61 is attached to the front surface of the lens holder 50 to hold parts such as the taking lens 5 housed in the lens barrel 51 and the switching ring 65 attached to the outer periphery of the lens barrel 51 so as not to come off.

The diaphragm switching plate 60 is a rectangular plate, and is provided at one end with a small diaphragm portion 60a large enough to block the large diaphragm opening 58a. The small diaphragm portion 60a has a smaller diameter than the large diaphragm opening 58a. A diaphragm opening (hereinafter referred to as a small diaphragm opening) 60b is formed. Small stop opening 60b is a made of a small aperture, the aperture value F ₁ is the diameter are determined such that F ₁ = F22.4 (nominal F22). Since the actual aperture value F22.4 may be used as the aperture value F22, F22 described in the claims will be described as F22.4 in the present embodiment. At the other end of the aperture switching plate 60, a hole 60c and a bent long hole 60d are formed. The hole 60c is inserted into a pin 65 formed in the vicinity of the lens barrel 51 of the lens holder 50 so that the diaphragm switching plate 60 can swing.

  The aperture switching plate 60 described above has a small aperture position (see FIG. 5) where the small aperture portion 60a is arranged on the photographing optical axis, and a large aperture that retracts the small aperture portion 60a out of the optical path and exposes the large aperture opening 58a. It is rotated between positions (see FIG. 6). When the small aperture position is reached, the photographing light passes through the small aperture opening 60b having a small diameter and the large aperture opening 58a having a large diameter. As a result, the amount of light is limited by the small aperture opening 60b having a small diameter. .

  A switching ring 65 is rotatably fitted on the outer periphery of the lens barrel 51. The switching ring 65 is a link on which a spring hooking pin 65a on which one end of the spring 70 is hung, a link pin 65b inserted into the long hole 60d of the aperture switching plate 60, and a pressing lever 85e of the exposure switching member 85. A pin 65c is provided. The other end of the spring 70 is hooked on a pin 71 formed in the lower front portion of the lens holder 50, and biases the switching ring 65 in the direction E in FIG. The switching ring 65 biased by the spring 70 is held at a predetermined position by the aperture switching plate 60 or a pressing lever 85e of an exposure switching member 85 described later. The position of the switching ring 65 when the operation unit 28 is in the first position will be described as the initial position.

  The top member 75 that functions as the shutter speed switching means includes a rotation shaft 76, a gear 77, and a stopper 78. One end of the rotating shaft 76 is rotatably assembled to a boss 80 provided on the main body base 31. The other end of the rotating shaft 76 is inserted into a guide hole 85 c provided in the exposure switching member 85. Since the rack 85a meshes with the gear 77, the top member 75 rotates in the X direction in FIG. 8 when the operation unit 28 is operated in the A direction in FIG. On the other hand, when the operation unit 28 is operated in the B direction in FIG. 1, the top member rotates in the Y direction in FIG.

The stopper 78 is positioned on the rotation locus of the rotation prevention piece 47a of the shutter blade 45 when the operation unit 28 is in the first position and the third position (see FIG. 8). At this time, when the release button 20 is operated, the shutter blade 45 is rotated, but the rotation prevention piece 47a is brought into contact with the stopper 78 during the rotation (two-dot chain line in FIG. 8), and the shutter blade 45 is moved. The rotation is stopped. Thereafter, the spring 49 is rotated to the closed position by the return force of the spring 49. Thereby, when the stopper 78 is located on the rotation locus of the rotation preventing piece 47a, the shutter speed becomes high. When this high shutter speed is set, the shutter speed T ₁ is T ₁ = 1/180 seconds. The position of the stopper at this time will be described below as a high-speed shutter position.

On the other hand, when the operation unit 28 is in the second position or the fourth position (see FIG. 9), the stopper 78 is retracted from the rotation locus of the rotation prevention piece 47a of the shutter blade 45. At this time, since the rotation prevention piece 47a of the shutter blade 45 does not contact the stopper 78 during the rotation, the shutter blade 45 is rotated in the direction F in FIG. 9 to the position of the dashed line in FIG. Then, it is rotated toward the closed position (in the G direction in FIG. 9) by the restoring force of the spring 49. Thus, when the stopper 78 is in the position retracted from the rotational locus of the rotation preventing pieces 47a, the shutter speed becomes slower shutter speed, the shutter speed T ₂ is T ₂ = 1/45 sec. Hereinafter, the position of the stopper 78 will be described as a low-speed shutter position.

  The exposure switching member 85 is formed such that a rack 85a is formed on a top surface of a base 85b, and a guide hole 85c formed with a guide hole 85c through which one end of the rotation shaft of the top member 75 is inserted. The operating portion 28 described above and a pressing lever 85e that presses the link pin 65c provided on the switching ring 65 described above are provided. The exposure switching member 85 moves in the M direction in FIG. 3 or the N direction in FIG. In accordance with this movement, the gear 77 screwed with the rack 85a is rotated, that is, the top member 75 is rotated, and the stopper 78 is positioned on the rotation locus of the rotation prevention piece 47a of the shutter blade 45 (see FIG. 8) or to a position (see FIG. 9) retracted from the rotation locus of the rotation prevention piece 47a.

  When the exposure switching member 85 moves, the pressing lever 85e also moves. For example, when the exposure switching member 85 moves in the M direction in FIG. Press against the bias of the spring 70. Thereby, the switching ring 65 rotates in the Q direction in FIG. For example, when the operation unit 28 is operated to move the operation unit 28 from the first position to the third position or the fourth position, the switching ring 65 rotates in the Q direction in FIG. The aperture switching plate 60 is moved in the direction R in FIG. 6 by the link pin 65b, and the aperture is switched from the small aperture to the large aperture. The same applies when the operation unit 28 is moved from the second position to the third position or the fourth position. On the other hand, when the operation unit 28 is moved from the first position to the second position, or is moved from the third position to the fourth position, the aperture switching plate 60 is prevented from rotating.

  On the other hand, when the operation unit 28 is moved in the N direction in FIG. 4, the switching ring 65 rotates in the S direction in FIG. 4 by the restoring force of the spring 70. For example, when the operation unit 28 is moved from the third position to the first position or the second position, the pressing lever 85e moves in the N direction in FIG. 65 rotates in the S direction in FIG. In response to this, the diaphragm switching plate 60 moves in the T direction in FIG. 6 and the small diaphragm portion 60 a is inserted into the lens barrel 51. Thereby, the aperture is changed from a large aperture to a small aperture. The same applies when the operation unit 28 is moved from the third position to the first position or the second position.

  As described above, this lens-equipped film unit 2 uses a color reversal film having a film sensitivity of ISO400 as the photographic film 22b. In the first shooting mode, the shutter speed is 1/180 seconds and the aperture value is F22.4. In the second shooting mode, the shutter speed is 1/45 seconds and the aperture value is F22.4. In the third shooting mode, the shutter speed is 1/180 seconds and the aperture value is F5.6, and in the fourth shooting mode, the shutter speed is 1/45 seconds and the aperture value is F5.6.

For example, when an appropriate EV value based on ISO 100 is calculated in each shooting mode, EV14.5 in the first shooting mode, EV12.5 in the second shooting mode, EV10.5 in the third shooting mode, and fourth shooting. In the mode, EV is 8.5. If the latitude of the color reversal film is ± 1 EV, this lens-fitted photo film unit can perform appropriate exposure photography in the range of EV7.5 to EV15.5. Note that the appropriate EV value based on ISO 100 is “EV = log ₂ (F ² / T) −log ₂ (S) when the aperture value is F, the shutter speed is T (seconds), and the film sensitivity is S. / 100) ".

  Next, the operation of this embodiment will be described. For example, when shooting in a bright place such as outdoors during the day on a sunny day, the first shooting mode is selected. To enter the first shooting mode, the operation unit 28 is set to the first position. At this time, when the operation unit 28 is set from the second position to the first position, the pressing lever 85e moves in the N direction in FIG. 4, and therefore rotates in the Q direction in FIG. At this time, the rim pin 65b rotates, but the aperture switching plate 60 remains set at the small aperture position. On the other hand, the top member 75 is rotated in the Y direction in FIG. 8 by the operation of the operation unit 28, and the stopper 78 is held at the high-speed shutter position located on the rotation locus of the rotation prevention plate 47 a of the shutter blade 45.

  When the operation unit 28 is moved from the state held at the third position or the fourth position to the first position, the pressing lever 85e moves in the N direction in FIG. 6 or FIG. At this time, the switching ring 65 receives the restoring force of the spring 70 and rotates in the S direction in FIG. 6 or FIG. At this time, the link pin 65b of the switching ring 65 rotates, and reaches the bent portion of the long hole 60d of the aperture switching plate 60 during the rotation. When the link pin 65b reaches the bent portion, the aperture switching plate 60 rotates in the T direction in FIG. 6, the small aperture portion 60a of the aperture switching plate 60 is inserted into the lens barrel 51, and the aperture is reduced from the large aperture to the small aperture. Aperture is set. On the other hand, the top member 75 rotates in the Y direction in FIG. 8 by the movement of the operation unit 28 in the B direction in FIG. When the operation unit 28 is set to the first position, the stopper 78 of the top member 75 is set on the rotation locus of the rotation prevention piece 47a of the shutter blade 45. When the operation unit 28 is set from the second position to the first position, the aperture is set to the small aperture position as it is. On the other hand, when the operation unit 28 is moved from the second position to the first position, the top member rotates in the Y direction in FIG. 8, and the stopper 78 of the top member 75 rotates the rotation prevention piece 47 a of the shutter blade 45. From the position retracted from the locus, it is set on the rotation locus, that is, the high-speed shutter position.

  When the release button 9 is pressed in the first photographing mode, the shutter blade 45 rotates in the direction F in FIG. 8 from the closed position to the open position in response to this, but the rotation preventing piece 47a is the stopper 78. , The rotation is stopped, and the spring 49 moves in the G direction in FIG. The exposure opening 41 is opened and closed by the rotation of the shutter blade 45. Thereby, exposure is performed at a shutter speed of 1/180 seconds.

  While the shutter blade 45 is opened and closed as described above, the light from the subject incident on the photographing lens 5 exposes the reversal film 22b through the small aperture 60b and the large aperture 58a. In this case, the amount of light is regulated by the small aperture opening 60b having the aperture value F22.4.

  As a result, a reversal film 22b having a film sensitivity of ISO 400 is exposed at a shutter speed of 1/180 seconds and an aperture value of F22.4. In this first shooting mode, the appropriate EV value is EV14.5, Good photographing can be performed in the range of EV13.5 to EV15.5.

  On the cloudy day, when shooting outdoors during the day, the second shooting mode is selected. To enter the second shooting mode, the operation unit 28 is operated from the first position to the second position. By this operation, the pressing lever 85e moves in the M direction in FIG. At this time, since the 65c link pin 65c is pressed by the pressing lever 85e, the switching ring 65 rotates in the Q direction in FIG. As the switching ring 65 rotates, the link pin 65b rotates. However, since the position of the link pin 65b does not reach the bent portion of the elongated hole 60d of the aperture switching plate 60, the aperture switching plate 60 is As in the first shooting mode, the small aperture position is set. Further, as shown in FIG. 9, by operating the operation unit 28, the top member 75 rotates in the X direction in FIG. 8, and the stopper 78 is set at the low-speed shutter position.

  On the other hand, when the operation unit 28 is moved from the third position or from the fourth position to the second position, the switching ring 65 rotates in the S direction in FIG. As shown in FIG. 6 or FIG. 7, when the operation unit 28 is in the third position or the fourth position, when the switching ring 65 rotates in the S direction in FIG. It passes through the bent part of the long hole 60d of the plate 60. With this passage, the diaphragm switching plate 60 rotates in the T direction in FIG. 6, and the diaphragm is switched from the large diaphragm to the small diaphragm. Further, the top member 75 is rotated in the Y direction in FIG. 8 by the movement of the operation unit 28 in the M direction in FIG. 8, and the stopper 78 is set at the low speed shutter position.

  When the release button 9 is pressed in the second photographing mode, the shutter blade 45 is rotated from the closed position toward the open position in response to this. At this time, when the stopper 78 is set at the low-speed shutter position, the shutter blade 45 is rotated to the position of the one-dot chain line in FIG. The exposure opening 41 is opened and closed. As a result, exposure is performed at a shutter speed of 1/45 seconds.

  As described above, while the shutter blade 45 is opened and closed, the light from the subject incident on the photographic lens 5 exposes the photographic film 22b through the small aperture 60b and the large aperture 58a. In this case, the amount of light is regulated by the small aperture 60b having the aperture value F22.4.

  As a result, a reversal film 22b having a film sensitivity of ISO 400 is exposed at a shutter speed of 1/45 seconds and an aperture value F22.4. In this first shooting mode, the appropriate EV value is EV12.5, Good photographing can be performed in the range of EV11.5 to EV13.5.

  In addition, the third shooting mode is selected when shooting outdoors on a rainy day or shooting in the evening. To enter the third shooting mode, the operation unit 28 is operated to the third position. For example, when the operation unit 28 is moved from the first position or the second position to the third position, the switching ring rotates in the Q direction in FIG. 4 or FIG. During this rotation, the link pin 65b also rotates. During the rotation of the link pin 65b, it passes through the bent portion of the long hole 60d, and during this passage, the diaphragm switching plate 60 rotates in the R direction in the figure. As a result, the aperture is switched from the small aperture to the large aperture. Further, by operating the operation unit 28, the top member 75 rotates in the X direction in FIG. 8, and the stopper 78 is set on the rotation locus of the rotation prevention piece 47a of the shutter blade 45, that is, at the high-speed shutter position. Is done.

  On the other hand, when the operation unit 28 is moved from the fourth position to the third position, the rotation of the link pin 65b of the switching ring 65 stops at a position that does not reach the bent portion of the long hole 60d. Set with a large aperture. Further, the top member 75 rotates in the Y direction in FIG. 8 and is set on the rotation locus from the position retracted from the rotation locus of the rotation preventing piece 47a, that is, at the high-speed shutter position.

  When the release button 9 is pressed in the third shooting mode, the shutter blade 45 rotates in response to the closed position from the closed position to the open position. The rotation is stopped, and the opening / closing operation of returning to the closed position again by the return force of the spring 49 is performed, and the exposure opening 41 is opened / closed. Thereby, exposure is performed at a shutter speed of 1/180 seconds.

  While the shutter blade 45 is opened and closed as described above, the light from the subject incident on the photographing lens 5 gives exposure to the reversal film 22b through the large aperture 58a having an aperture value F5.6. Become.

  As a result, a reversal film 22b having a film sensitivity of ISO 400 is exposed at a shutter speed of 1/180 seconds and an aperture value of F5.6. In this third shooting mode, the appropriate EV value is EV10.5, Good photographing can be performed in the range of EV9.5 to EV11.5.

  In addition, when an operation is performed in a bright room such as a dome, a gymnasium, or an event hall, the fourth shooting mode is selected. In this case, when the operation unit 28 is operated from the first position or the second position to the fourth position, the link pin 65b passes through the bent portion of the long hole 60d, so that the aperture switching plate 60 is moved in the R direction in FIG. To turn. Thereby, the aperture is set to a large aperture. Further, by the operation of the operation unit 28, the top member 75 rotates in the X direction in FIG. 8 and is set at a position where it is retracted from the rotation trajectory of the rotation prevention piece 47a, that is, a low-speed shutter position. When the operation unit 28 is operated from the third position to the fourth position, the diaphragm switching plate 60 does not rotate, so that the diaphragm remains set at the large diaphragm position. Further, the top member 75 rotates in the X direction in FIG. 8, and the stopper 78 is set at a position where the stopper 78 is retracted from the rotation locus of the rotation preventing piece 47a, that is, a low-speed shutter position.

  When the release button 20 is pressed in the fourth photographing mode, the shutter blade 45 is rotated from the closed position toward the open position in response thereto. At this time, when the stopper 78 is set at the low-speed shutter position, the shutter blade 45 is rotated to the position indicated by the one-dot chain line in FIG. The exposure opening 41 is opened and closed. As a result, exposure is performed at a shutter speed of 1/45 seconds.

  While the shutter blade 45 is opened and closed as described above, the light from the subject incident on the photographing lens 5 gives exposure to the reversal film 22b through the large aperture 58a having an aperture value F5.6. Become.

  As a result, the reversal film 22b having a film sensitivity of ISO 400 is exposed at a shutter speed of 1/45 seconds and an aperture value of F5.6. In this fourth shooting mode, the appropriate EV value is EV8.5, Good photographing can be performed in the range of EV7.5 to EV9.5.

  When shooting using the strobe device 32 in any of the first to fourth shooting modes described above, the release button 20 is operated after operating the operation unit 26 of the strobe selection unit 18 from the off position to the on position. To do. In this case, strobe light is emitted toward the subject at the time of shooting. In this case, the strobe light eliminates the shadow generated on the subject, so-called shadow cancellation, and the contour of the subject is clearly defined with respect to the background. Used for auxiliary purposes.

  In this embodiment, the shutter speed switching means is constituted by the top member provided with a stopper that contacts the rotation prevention piece of the shutter blade and switches the rotation amount of the shutter blade. However, the present invention is not limited to this. The 1 stopper and the 2nd stopper are comprised from the speed switching member arrange | positioned at predetermined intervals, and the operation part can be slid between the 1st position and the 4th position. When the operation unit is at the first position, the first stopper is positioned on the rotation locus of the rotation prevention piece of the shutter blade. When the operation unit is at the third position, the second stopper is positioned on the rotation locus of the rotation prevention piece of the shutter blade. When the operation unit is in the second position and the fourth position, either the first stopper or the second stopper is retracted from the rotation locus of the rotation prevention piece of the shutter blade.

  In the present embodiment, when the operation unit 28 is moved in the M direction in FIG. 3, the link pin 65c is pressed by the pressing lever 85e, and as a result, the switching ring 65 is rotated in the Q direction in FIG. 28 is moved in the N direction in FIG. 3, the switching ring 65 is rotated in the S direction in FIG. 4 by the restoring force of the spring 70. However, the present invention is not limited to this. For example, the pressing lever 85e It is also possible to provide a groove or a hole into which the link pin 65c is inserted and rotate the switching ring 65 by moving the operation unit 28. Thereby, it is not necessary to use the spring 70, and the number of parts can be reduced.

In this embodiment, the film sensitivity of the color reversal film is ISO400, the aperture value of the small aperture is F ₁ = 22.4, and the aperture value of the large aperture is F ₂ = F5.6. However, it is necessary to limit to this. For example, the film sensitivity may be ISO200, the aperture value of the small aperture may be F ₁ = 16, and the aperture value of the large aperture may be F ₂ = F4. In this case, in the lens-fitted photo film unit, it is possible to take a picture within an appropriate exposure range of EV7.5 to EV15.5.

It is a perspective view which shows the external appearance of a film unit with a lens. It is a perspective view which decomposes | disassembles and shows the structure of the film unit with a lens. It is a perspective view which decomposes | disassembles and shows the structure of a lens-barrel vicinity. It is a front view which shows the position of the aperture switch board in the 1st imaging | photography mode. It is a front view which shows the position of the aperture switch board in the 2nd imaging | photography mode. It is a front view which shows the position of the aperture switch board in the 3rd imaging | photography mode. It is a front view which shows the position of the aperture switch board in the 4th imaging mode. It is a front view which shows the rotation position of the shutter spring at the time of 1st imaging | photography mode and 3rd imaging | photography mode. It is a front view which shows the rotational position of the shutter spring at the time of 2nd imaging mode and 4th imaging mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Film unit with a lens 18 Strobe selection part 19 Exposure switching part 20 Release button 28 Operation part 30b Reversal film 32 Strobe device 41 Exposure opening 45 Shutter blade 47a Rotation prevention piece 58a Large aperture opening 60 Aperture switching plate 60b Small aperture opening 75 top Member 78 Stopper

Claims (5)

A shutter that opens the exposure opening in response to a release operation;
An aperture that adjusts the amount of captured subject light, and
In the film unit with a lens that exposes the subject light whose light amount is adjusted by the diaphragm to an unexposed photographic film through an exposure opening when the shutter is opened.
The photographic film is a reversal film,
A diaphragm switching means for switching the diaphragm between a large diaphragm and a small diaphragm;
Shutter speed switching means for switching a shutter speed of the shutter between a high shutter speed and a low shutter speed;
The first shooting mode in which the shutter speed is switched to a high shutter speed by the shutter speed switching unit, the aperture is set to a small aperture by the aperture switching unit, the shutter speed is switched to a low shutter speed by the shutter speed switching unit, and the aperture is decreased by the aperture switching unit. The second shooting mode with an aperture, the shutter speed switching means with a high shutter speed, the third shooting mode with a large aperture with the aperture switching means, and the shutter speed switching means with a low shutter speed. A film unit with a lens, comprising: a shooting mode selection operation unit operated to select one of the fourth shooting modes in which the aperture is set to a large aperture by the aperture switching unit.   2. The film unit with a lens according to claim 1, wherein the film sensitivity of the reversal film is ISO400. Wherein F ₁ the aperture of the small aperture, said large stop aperture value is taken as _{F 2, F 1 = 22,} F 2 = 5.6 and satisfies the claim 1 or 2, wherein the lens Film unit with. The high-speed shutter speed T _1, the low speed shutter speed is taken as _{T 2, T 1 = 1/} 180 sec, T ₂ = 1/45 sec and satisfies the claims 1 to 3, wherein any Film unit with lens. A strobe device that emits strobe light in response to the release operation, and strobe selection operation means that is operated to select whether or not to emit strobe light in conjunction with the release operation. 5. The lens-fitted photo film unit according to claim 1, wherein the operating means and the strobe selection operating means are provided separately.

Images