JP2006098769A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera constituted so that the power source of a photometry circuit can be surely turned on before a photographing mode is switched, and also, the power source can be turned off after a lapse of prescribed time. <P>SOLUTION: The power switch 100 of the photometry circuit 103 is turned on with an operation of depressing the mode operation part 22, and the photographing mode is switched by a photographing mode switching mechanism 9 with the operation of rotating the part 22. The side face 22a of the mode operation part 22 is formed into a tapered shape, and the rotating operation is locked by the engagement of a locking projection 87e and a recess 93a when the part 22 is not depressed. Thus, if the user tries to rotate the mode operation part 22, the part 22 is surely depressed before the rotating operation, then, the power switch 100 is turned on. The photometry circuit 103 is turned off by a timer circuit 104 after the lapse of prescribed time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a camera provided with a photometric circuit and an exposure adjusting means for manually adjusting an exposure amount.

  Various film units with lenses pre-loaded with photographic film at the time of manufacture are on the market. For example, a lens-equipped film unit “Night & Day (trade name)” (for example, see Patent Document 1) sold by the present applicant is loaded with a high-sensitivity photographic film and photographed in a bright place such as outdoors during the daytime. The main subject such as a person while reproducing the background at an appropriate density with a daytime shooting mode (with no flash) and daytime sync mode (with flash) and a night scene or dark room as a background. There are three shooting modes including night-synchronous shooting mode corresponding to shooting with a strobe light.

  When shooting in the night-synchronous shooting mode of the above-mentioned film unit with a lens, the background of a night view or dark room is reproduced with an appropriate density, and sufficient brightness is ensured with strobe light for main subjects such as people. can do. However, there is a problem that the shadow of the main subject illuminated with the strobe light disappears, or the light source color of the background is canceled by the strobe light, so that any photograph can be seen with the same impression. there were.

In order to solve the above problems, the present applicant has filed an application for an invention of a lens-fitted photo film unit having a mode switching mechanism in which a high-sensitivity photographic film is loaded and the exposure amount can be switched in a plurality of stages. (Japanese Patent Application No. 2003-320271).
JP 2004-085620 A

  However, many users of the lens-fitted photo film unit do not have specialized knowledge about photography, and cannot select an appropriate mode based on the brightness of the subject. When such a lens-equipped film unit user uses the lens-equipped film unit described in the above-mentioned prior application, the user shoots outdoors in the mode for indoor shooting, resulting in a shooting error due to extreme overexposure. It is possible to do.

  In order to solve the problems of the prior application, it is conceivable to provide a photometric circuit in the lens-fitted photo film unit so that the mode can be switched based on the measurement result of the photometric circuit. However, it is not suitable for a lens-fitted photo film unit that requires as simple an operation as possible because it requires two operations of turning on the power of the photometry circuit and switching the mode with the mode switching mechanism when photographing. In addition, it is necessary to measure the subject brightness by the photometry circuit before the mode switching operation, but it is likely that users of the lens-fitted photo film unit cannot often follow this operation procedure.

  Furthermore, the lens-fitted film unit has a structure in which the battery cannot be replaced. For this reason, the power switch of the photometry circuit must be turned off after use so that the battery is not consumed and the photometry circuit cannot be operated.

  An object of the present invention is to provide a camera capable of turning on the photometry circuit before switching the shooting mode and turning off the photometry circuit after a lapse of a predetermined time. .

  In order to solve the above problems, a camera of the present invention includes a photometric circuit for measuring subject luminance, display means for displaying a measurement result of the photometric circuit, and a power switch for supplying power to the photometric circuit when turned on. An exposure amount adjusting means including at least a first exposure state and a second exposure state in which the exposure amount is larger than the first exposure state, and the exposure amount adjustment means is connected to the first exposure state and the first exposure state. And an operating means for turning on the power switch by a preliminary operation performed before switching between the two exposure states.

  In addition, the operating means can be operated to perform a pressing operation and a rotating operation that rotates on a surface orthogonal to the pressing direction of the pressing operation, and the rotating operation of the operating member is locked, and the operating member is pressed. The lock means is configured to release the lock when operated, the power switch is turned on by pressing the operating member, and the exposure state of the exposure amount adjusting means is switched by rotating operation.

  Further, the operation member is provided with an operation portion having a substantially disk shape and a tapered side surface so that the cross section has a substantially trapezoidal shape, and the operation member is tapered when the operation member is rotated. The side surface of this was pushed and operated.

  In addition, a timer circuit is provided for measuring a certain time in response to the power switch being turned on and turning off the power of the photometry circuit when the time measurement is finished.

  Further, as the exposure amount adjusting means, an aperture switching means for switching the aperture between the large aperture and the small aperture, and a shutter speed switching means for switching the shutter speed between the low speed and the high speed were used. Moreover, these structures were used also for the film unit with a lens.

  According to the camera of the present invention, since the power supply operation to the photometry circuit and the switching operation with the exposure amount adjustment means are combined with one operation means, the operation complexity and cost increase due to the increase of the operation means Etc. does not occur. In addition, since the power switch of the photometry circuit is turned on by a preliminary operation when the exposure state is switched by the exposure amount adjusting means, the exposure state can be switched after confirming the subject brightness.

  Furthermore, since the rotation operation cannot be performed unless the operation member is pressed, the photometry circuit can be operated without fail before operating the exposure adjusting means. In addition, by devising the shape of the operation part of the operation member, the pressing operation is always performed when rotating, so that the pressing operation and the rotating operation can be performed in order without making the user aware of it. it can. Furthermore, since the power of the photometry circuit is automatically turned off by the timer circuit, the battery is not wasted.

  The appearance of a lens-fitted photo film unit embodying the present invention is shown in FIG. The lens-fitted photo film unit 2 includes a unit main body 3 in which various photographing mechanisms are incorporated, a film cartridge that is loaded when the unit main body 3 is manufactured, and a label 4 that is attached so as to be wound around the outer periphery of the unit main body 3. Consists of. The label 4 is formed with an opening for exposing each part of the unit main body 3.

  An exploded view showing the configuration of the unit body 3 is shown in FIG. The unit main body 3 includes a main body base 8 loaded with a 135 type film cartridge 7, a photographing mode switching mechanism 9 for switching a photographing mode, a printed circuit board 10 and a battery 11, and a front side and a rear side of the main body base 8. The front cover 12 and the rear cover 13 are attached to the front cover. The photographing mode switching mechanism 9 corresponds to an operation unit that switches the exposure state of the exposure amount adjustment unit.

  The film cartridge 7 includes a cartridge 7a and a photographic film 7b, and is loaded together with the battery 11 at the time of manufacture. As the photographic film 7b, for example, one having ISO 3200 film sensitivity is used.

  A light shielding cylinder 16 is provided in the center of the front surface of the main body base 8. A shutter charge mechanism, a shutter release mechanism, a film winding mechanism, a film winding mechanism, a film count mechanism, a photographing optical system, a finder optical system, and the like are incorporated around the light shielding cylinder 16. In addition, a diaphragm switching mechanism and a shutter speed switching mechanism constituting the above-described exposure amount adjusting means are also incorporated.

  On the front surface of the unit body 3, a photographing lens 19, a finder 20, a light receiving unit 21, and a mode operation unit 22 are provided. A release button 23 and a counter display window 24 are provided on the upper surface of the unit body 3, and a part of a winding knob 25 used for winding the film after photographing is exposed on the back surface.

  As shown in the cross section of FIG. 3, the light receiving unit 21 includes an opening 28 formed in the front cover 12, a transparent protective plate 29 that closes the opening 28, and a light receiving element 30 that is disposed facing the opening 28. It is composed of The light receiving element 30 is made of, for example, CdS whose resistance value changes according to the amount of received light, and is used for measuring the subject luminance. The light receiving element 30 constitutes a photometric circuit described later.

  As shown in FIG. 4, an indicator 34, which is a display means for indicating the measurement result of the subject luminance, is provided in the vicinity of the eyepiece window 33 of the finder 20 provided on the back surface of the lens-fitted photo film unit 2. As shown in a cross section in FIG. 5, the indicator 34 includes an opening 35 formed in the rear cover 13, a transparent protective plate 36 that closes the opening 35, and an LED 37 disposed facing the opening 35. ing. The LED 37 is connected to a photometry circuit, and emits light when the subject brightness is lower than a set value, and is turned off when the subject brightness is high.

  The mode operation unit 22 has a substantially disk shape and projects forward from an operation opening 40 formed in the front cover 12. The mode operation unit 22 constitutes the photographing mode switching mechanism 9 described above. As shown in an enlarged view in FIG. 6 (A), the mode operation unit 22 has a side surface 22a that is tapered so that the cross-section is substantially trapezoidal. Therefore, many fine grooves are formed. An indicator 22b indicating the rotation position is provided on the front surface of the mode operation unit 22. In addition, around the operation opening 40 on the front surface of the front cover 12, indicators 41 a and 41 b serving as rotation targets of the mode operation unit 22 are provided.

  The index 41a is a mark representing the sun. When the mode operation unit 22 is rotated so that the index 22b is aligned with the index 41a, the lens-fitted photo film unit 2 is in the daytime shooting mode suitable for shooting outdoors in the daytime. Can be switched to. Further, as shown in FIG. 6B, the index 41b is a mark representing the moon, and when the index 22b is aligned with the index 41b, the mode can be switched to a night shooting mode suitable for shooting indoors or in a dark place.

  The daytime shooting mode corresponds to a first exposure state in which the exposure adjustment means is a small aperture and a high-speed shutter. Also, the night photographing mode corresponds to a second exposure state in which the exposure amount adjusting means is a large aperture and a low speed shutter. For example, some display may be performed in the finder 20 in the night photographing mode so that the photographer can determine the photographing mode while looking into the finder 20.

  FIG. 7 is an exploded perspective view showing a configuration 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 16. A rectangular exposure opening 44 is formed on the front surface of the light shielding tube 16. A pin 46 for swingably supporting the shutter blade 45 and a pin 48 on which one end of a spring 47 is hung are provided on the side of the light shielding cylinder 16.

  The shutter blade 45 constituting the shutter mechanism includes a base portion 51 in which a hole 51a inserted into the pin 46 is formed, a blade portion 52 that is disposed in front of the exposure opening 44 and opens and closes the exposure opening 44, and a base. It consists of the connection part 53 which connects the part 51 and the blade | wing part 52. FIG. The base 51 is provided with a pin 51b on which the other end of the spring 47 is hooked, a protrusion 51c kicked off by the shutter drive lever 54, and a speed adjustment protrusion 51d. The shutter blade 45 is held at a closed position that is biased by a spring 47 to close the exposure opening 44.

  The shutter drive lever 54 is one of the components constituting the shutter mechanism, and is rotated in the direction opposite to the arrow A in the figure by the shutter charge mechanism and set at the charge position. Then, in response to the pressing operation of the release button 23, it rotates in the direction of the arrow A toward the charge release position, and at that time, the protruding portion 51c of the shutter blade 45 is kicked off. The shutter blade 45 kicked by the shutter drive lever 54 rotates in the direction of arrow B in the figure against the bias of the spring 47, fully opens the exposure opening 44, and then returns to the closed position by the bias of the spring 47. To do. The shutter blade 45 is fully opened to fully open the exposure opening 44 and is rotatable until it reaches a moving end position that comes into contact with a stopper pin 56 a (see FIG. 8) provided on the inner surface of the lens holder 56.

  On the upper part of the lens holder 56, a pin 60 for rotatably supporting the stop lever 59 is formed. The stop lever 59 includes a boss 61 supported by the pin 60 and two arms 62 and 63 protruding from the side surface of the boss 61, and a pad 62 a is formed at the tip of one arm 62.

  The stop lever 59 is rotated between a high-speed shutter position where the pad 62a enters the movement locus of the speed adjustment protrusion 51d of the shutter blade 45 and a low-speed shutter position where the pad 62a is retracted from the movement locus.

  As shown in FIG. 8A, when the shutter release is performed when the stop lever 59 is in the high-speed shutter position, the speed adjustment protrusion 51d of the shutter blade 45 abuts the pad 62a. The rotation is prevented during the movement to the position. Thereby, the shutter blade 45 returns to the closed position in a short time. The shutter speed at this time is, for example, 1/100 second, and this is the shutter speed of the high-speed shutter in the daytime shooting mode.

  Contrary to the above, as shown in FIG. 8B, when the stop lever 59 is in the low-speed shutter position, the speed adjustment protrusion 51d rotates without contacting the pad 62a. For this reason, the shutter blade 45 rotates to the moving end position. As a result, the time until the shutter blade 45 returns to the closed position becomes longer and the shutter speed becomes slower. The shutter speed at this time is, for example, 1/45 seconds, and this is the shutter speed of the low-speed shutter in the night photographing mode.

  As shown in FIG. 7, a lens holder 56 is attached in front of the light shielding tube 16. In the center of the front surface of the lens holder 56, a cylindrical lens barrel 66 is formed. An opening 67 is formed in the lens barrel 66, and a notch 68 is formed on the side surface of the lens barrel 66. In the lens barrel 66, a first lens 70 and a second lens 71 constituting the photographing lens 19 are housed. Between the first lens 70 and the second lens 71, a spacer 74 that secures an insertion space for the large diaphragm plate 72 and the diaphragm switching plate 73 is housed. On the front surface of the lens holder 56, a lens pressing plate 76 that holds the components such as the photographing lens 19 housed in the lens barrel 66 and the switching ring 75 attached to the outer periphery of the lens barrel 66 is attached.

  The large aperture plate 72, the aperture switching plate 73, the spacer 74, the switching ring 75, etc. constitute an aperture switching mechanism. The large diaphragm plate 72 is made of a thin circular plate, and has a large-diameter large diaphragm opening 72a at the center. The large aperture 72a is a large aperture in the night photographing mode, and the diameter thereof is determined so that the aperture value is, for example, F4.0.

  The diaphragm switching plate 73 is made of a substantially L-shaped thin plate, and is provided with a small diaphragm portion 73a having a size for closing the large diaphragm opening 72a at one end, and a small-diameter small diaphragm opening 73b formed in the small diaphragm portion 73a. Yes. The small aperture 73b is a small aperture in the daytime shooting mode, and its diameter is determined so that the aperture value is, for example, F18. At the other end of the diaphragm switching plate 73, a hole 73c and a bent long hole 73d are formed. The hole 73c is inserted into a pin 78 formed in the vicinity of the lens barrel 66 of the lens holder 56 so that the diaphragm switching plate 73 can swing.

  The aperture switching plate 73 has a small aperture position at which the small aperture portion 73a is arranged on the photographing optical axis, and a large aperture portion 72a that retracts the small aperture portion 73a from the notch 68 to the outside of the lens barrel 66 and exposes the large aperture aperture 72a. It is rotated between the aperture position. At the small stop position, the photographic light passes through the large stop opening 72a and the small stop opening 73b, and as a result, the amount of light is limited by the small stop opening 73b having a small diameter.

  A switching ring 75 is rotatably fitted on the outer periphery of the lens barrel 66. The switching ring 75 has a pair of clamping pins that sandwich a spring latching pin 75a on which one end of the spring 81 is hung, a link pin 75b inserted into the elongated hole 73d of the aperture switching plate 73, and an arm 63 of the stop lever 59. 75c and a follower pin 75d projecting to the back side are provided.

  The other end of the spring 81 is hooked on a pin 84 formed in the lower front portion of the lens holder 56, and urges the switching ring 75 in the direction of arrow C in the figure. Note that the switching ring 75 biased by the spring 81 is held at a predetermined position by the diaphragm switching plate 73.

  The photographing mode switching mechanism 9 includes a switching lever 88 c that rotates coaxially in conjunction with the rotation operation of the mode operation unit 22. FIG. 9A shows the state of the switching ring 75 in the daytime shooting mode. When the mode operation unit 22 is in the daytime shooting mode position, the switching lever 88 c does not contact the driven pin 75 d of the switching ring 75. Therefore, the switching ring 75 is held at the initial position by the spring 81 and the aperture switching plate 73.

  When the switching ring 75 is in the initial position, the small aperture portion 73a of the aperture switching plate 73 is inserted into the lens barrel 66 by the link pin 75b. As a result, the small stop portion 73a closes the large stop opening 72a and enters a small stop state. The pair of clamping pins 75c holds the stop lever 59 at the high-speed shutter position.

  As shown in FIG. 9B, when the mode operation unit 22 is rotated from the daytime shooting mode to the position of the nighttime shooting mode, the switching lever 88c moves the driven pin 75d against the bias of the spring 81. By pressing from below, the switching ring 75 is rotated counterclockwise in the figure. By the rotation of the switching ring 75, the diaphragm switching plate 73 pressed by the link pin 75b is rotated in the clockwise direction in the drawing, and the small diaphragm 73a is retracted from the optical axis to be in a large diaphragm state. The pair of clamping pins 75c sets the stop lever 59 at the low shutter speed position.

  As shown in FIGS. 10 and 11A, the photographing mode switching mechanism 9 includes an operation member 87 in which the mode operation unit 22 is integrally provided, a switching member 88 connected to the operation member 87, and an operation member. 87 and a spring 89 that is inserted between the switching member 88 and biases the operating member 87 forward. The operation member 87 is integrally provided with a flange 87 a that abuts on the inner wall surface 12 a of the front cover 12 and a drive shaft 87 c that is provided with a rectangular fitting piece 87 b fitted to the switching member 88 at the rear end. Yes. The flange 87a is integrally provided with a projecting portion 87d projecting in the radial direction. The projecting portion 87d is integrally formed with a semispherical lock projection 87e projecting forward. ing.

  The inner wall surface 12a of the front cover 12 is provided with stop pins 92a and 92b that come into contact with the protruding portion 87d and prevent rotation when the operation member 87 is set in the daytime shooting mode and the nighttime shooting mode. ing. Further, in the vicinity of the stop pins 92a and 92b, recesses 93a and 93b are formed to which the lock protrusions 87e are engaged when the operation member 87 is set in the daytime shooting mode and the nighttime shooting mode. The operation member 87 cannot be rotated in a normal state because the lock projection 87e is engaged with the recess 93a or 93b by the bias of the spring 89. The lock protrusion 87e, the recesses 93a and 93b, and the spring 89 function as a lock unit that locks the rotation operation of the operation member 87.

  In order to rotate the operation member 87, it is necessary to perform a pressing operation to push the mode operation unit 22 into the unit main body 3 to release the engagement between the lock protrusion 87e and the recess 93a or 93b. Since the mode operation portion 22 of the operation member 87 has a large tapered side surface 22a, when the mode operation portion 22 is pinched with a finger to rotate, the mode operation portion 22 is pressed by the inclination of the side surface 22a. The Thereby, the pressing operation of the mode operation unit 22 is surely performed by a preliminary operation of pinching the mode operation unit 22 to perform the rotation operation. Accordingly, the pressing operation can be performed before the rotation operation without making the user aware of it, so that a complicated feeling due to an increase in the operation does not occur.

  The switching member 88 has a substantially disc shape, and a front surface includes a driven shaft 88b formed with a rectangular recess 88a into which the fitting piece 87b of the operation member 87 is fitted, and a switching that protrudes in the horizontal direction. The lever 88c is integrally formed. A support shaft 88d is integrally formed on the back surface of the switching member 88. The support shaft 88d is a guide plate 96 (see FIG. 2) attached to the main body base 8 so as to be disposed in front of the printed circuit board 10. It is inserted into the recess 96a and is rotatably supported.

  Clearances are formed between the rear end of the drive shaft 87c of the operation member 87 and the tip of the driven shaft 88b of the switching member 88, and between the tip of the fitting piece 87b and the bottom surface of the recess 88a. . As shown in FIG. 11B, these gaps are provided in order to secure a movement allowance when the mode operation unit 22 is pressed.

  As described above, the switching lever 88c provided on the switching member 88 presses the driven pin 75d of the switching ring 75 from below when the daytime shooting mode is switched to the nighttime shooting mode. Thereby, the switching ring 75 is rotated in the direction opposite to the arrow C direction against the bias of the spring 81.

  Behind the flange 87a of the operation member 87, the tip portions of a pair of metal contact pieces 99a and 99b attached to the printed circuit board 10 are arranged. These metal contact pieces 99a and 99b constitute a power switch 100 of a photometric circuit provided on the printed circuit board 10. Since the operation member 87 is always pressed when the mode operation unit 22 is rotated, the flange 87a presses the tip of one metal contact piece 99a so as to contact the tip of the other metal contact piece 99b. As a result, the power switch 100 is turned on to supply power to the photometry circuit.

  A printed circuit board 10 shown in FIG. 2 has a circuit formed by attaching a large number of electrical components together with the light receiving element 30, the LED 37, and the power switch 100. FIG. 12 is a block diagram illustrating a configuration of the printed circuit board 10. The printed circuit board 10 is provided with a photometry circuit 103 and a timer circuit 104. The photometry circuit 103 determines, for example, the level of the subject brightness from the light receiving element 30, the amplifying unit 105 that amplifies the output signal of the light receiving element 30, and the amplified signal, and the brightness is lower than a preset value. In some cases, the LED 37 includes a determination unit 106 that emits light.

  The timer circuit 104 is, for example, a CR timer that combines a capacitor and a resistor. The timer circuit 104 stores a charge in the capacitor when the power switch 100 is turned on, and causes the photometry circuit 103 to perform photometry using the stored charge. When all the charges in the capacitor are used, the power of the photometry circuit 103 is turned off, so that the battery 11 is not consumed wastefully.

  Next, the operation of the above embodiment will be described. The user visually confirms the brightness of the subject when taking a picture, and pinches the mode operation unit 22 with his / her finger to switch the shooting mode of the lens-fitted photo film unit 2. The mode operation unit 22 has a side surface 22a formed in a tapered shape, and further, as shown in FIGS. 10 and 11A, the rotation operation is locked by the engagement of the lock protrusion 87e and the recess 93a. Even if the user is not conscious, the pressing operation is always performed before the rotating operation. As shown in FIG. 11B, when the mode operation unit 22 is pressed, the lock protrusion 87e is detached from the recess 93a, and the metal contact piece 99a of the power switch 100 is pressed by the flange 87a. The metal contact piece 99a is elastically deformed to contact the other metal contact piece 99b, and the power switch 100 is turned on.

  As shown in FIG. 12, when the power switch 100 is turned on, power is supplied from the battery 11 to the timer circuit 104. The timer circuit 104 charges the capacitor constituting the CR timer while the power switch 100 is on, and supplies power to the photometry circuit 103 from this capacitor.

  As shown in FIG. 3, the light receiving element 30 receives subject light through the protection plate 29 and inputs a detection signal having a current value corresponding to the amount of received light to the amplification unit 105. The amplification unit 105 amplifies the input detection signal and inputs the detection signal to the determination unit 106. The determination unit 106 determines the subject brightness from the input signal. When the subject brightness is lower than a preset value, the LED 37 of the indicator 34 shown in FIGS. Inform the user that the shooting environment is suitable for the camera. When all the charges of the capacitor of the timer circuit 104 are used, the power supply to the photometry circuit 103 is stopped, so that the battery 11 is not wasted.

  The user who confirms the display of the indicator 34 rotates the mode operation unit 22 while pressing the mode operation unit 22 and rotates it clockwise in FIG. 2 to align the index 22b with the index 41b. By the rotation operation of the mode operation unit 22, the switching member 88 connected to the operation member 87 rotates together, and the switching lever 88c presses the driven pin 75d from below, and the switching is performed as shown in FIG. 9B. The ring 75 is rotated counterclockwise. In conjunction with the rotation of the switching ring 75, the aperture switching plate 73 is rotated to the large aperture position, the small aperture 73a is retracted from the optical path of the photographic lens 19, and the amount of light is regulated by the large aperture 72a. It becomes like this. Further, the stop lever 59 is set at a low-speed shutter position.

  When shooting is performed by pressing the release button 23 in this night shooting mode, the shutter blade 45 is not in contact with the pad 62a because the stop lever 59 is at the low-speed shutter position as shown in FIG. 8B. It rotates and returns to the closed position after reaching the moving end position. Further, while the shutter blade 45 is opened and closed in this way, the light from the subject incident on the photographing lens 19 exposes the photographic film through the large aperture 72a without passing through the small aperture 73b. .

  In the night shooting mode, a photographic film 7b having a film sensitivity of ISO 3200 is exposed at a shutter speed of 1/45 seconds and an aperture value of F4.0, so that a good shooting suitable for the subject brightness can be performed by increasing the exposure amount. Can do. Further, since no strobe is used, it is possible to take a picture utilizing available light such as indoor lighting, and for example, it is possible to obtain a photographic image having a sense of unity in the brightness and hue of the background and the main subject. Further, by not using the strobe light, there are effects such as no red eye is generated and no dark shadow is generated by the strobe light.

  On the contrary, when the subject brightness is high, the photometry circuit 103 notifies the user that the shooting environment is suitable for the daytime shooting mode without causing the indicator 34 to emit light. As shown in FIG. 9A, when the mode operation unit 22 is rotated from the night shooting mode to the day shooting mode, the switching ring 75 released from the pressing by the switching lever 88c is initialized by the bias of the spring 81. Rotate to position. When the switching ring 75 reaches the initial position, the aperture switching plate 73 is set to the small aperture position, and the stop lever 59 is set to the high-speed shutter position.

  When the release button 23 is pressed in this daytime shooting mode, the shutter blade 45 is rotated from the closed position toward the open position in response to this, and an opening / closing operation for returning to the closed position is performed again. Is done. At this time, the shutter blade 45 returns to the closed position before the speed adjusting projection 51d contacts the pad 62a and reaches the moving end position. Thereby, exposure is performed at a shutter speed of 1/100 second faster than the night photographing mode.

  While the shutter blade 45 is opened and closed as described above, light from the subject incident on the photographing lens 19 exposes the photographic film 7b through the small aperture 73b and the large aperture 72a. In this case, the amount of light is regulated by the small aperture 73b having the aperture value F18. As a result, it is possible to perform good photographing suitable for high subject brightness.

  In the above embodiment, the lens-equipped film unit having the daytime photographing mode and the nighttime photographing mode has been described as an example, but the present invention can also be used for a lens-equipped film unit having a large number of photographing modes. Further, although the film unit with a lens has been described as an example, the present invention can also be applied to a camera capable of replacing a photographic film.

It is a perspective view which shows the external appearance shape of the film unit with a lens which implemented this invention. It is a disassembled perspective view which shows the structure of a unit main body. It is sectional drawing which shows the structure of a light-receiving part. It is a perspective view which shows the external appearance shape of an indicator. It is sectional drawing which shows the structure of an indicator. It is explanatory drawing which shows the operation position of two places of a mode operation part. It is a disassembled perspective view which shows structures, such as a shutter release mechanism, an aperture switching mechanism, and a shutter speed switching mechanism. It is a front view which shows operation | movement of a shutter speed switching mechanism. It is a front view which shows operation | movement of an aperture switch mechanism. It is a disassembled perspective view which shows the structure of an imaging | photography mode switching mechanism. It is sectional drawing which shows operation | movement of an imaging | photography mode switching mechanism. It is a block diagram which shows the structure of the circuit provided in the printed circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Film unit with a lens 9 Shooting mode switching mechanism 10 Printed circuit board 11 Battery 21 Light receiving part 22 Mode operation part 22a Side face 30 Light receiving element 34 Indicator 37 LED
45 Shutter blade 59 Stop lever 72 Large aperture plate 73 Aperture switching plate 75 Switching ring 87 Operating member 88 Switching member 87e Lock projection 89 Spring 93a, 93b Recess 100 Power switch 103 Photometric circuit 104 Timer circuit

Claims (7)

A photometric circuit for measuring subject brightness;
Display means for displaying the measurement result of the photometric circuit;
A power switch for supplying power to the photometry circuit when turned on;
An exposure amount adjusting means comprising at least a first exposure state and a second exposure state in which the exposure amount is larger than the first exposure state;
An operation means for switching the exposure state of the exposure amount adjusting means and for turning on the power switch by a preliminary operation performed before the switching of the exposure state. The operating means is an operation member capable of performing a pressing operation and a rotating operation that rotates on a surface orthogonal to the pressing direction of the pressing operation;
Locking means for locking the rotation operation of the operation member and releasing the lock when the operation member is pressed;
2. The camera according to claim 1, wherein a power switch is turned on by a pressing operation of the operation member, and an exposure state of the exposure amount adjusting means is switched by a rotation operation.   The operation member is provided with an operation part having a substantially disk shape and a tapered side surface so that the cross section is substantially trapezoidal. When the operation member is rotated using the operation part, the side surface is pressed. The camera according to claim 2, wherein the camera is pressed and operated.   4. A timer circuit is provided, which measures a predetermined time in response to the power switch being turned on, and stops power supply to the photometry circuit when the time is finished. Or listed camera.   5. An aperture switching unit for switching the aperture between a small aperture in a first exposure state and a large aperture in a second exposure state as the exposure amount adjusting unit. Any camera listed.   6. The shutter speed switching means for switching the shutter speed between a high speed which is a first exposure state and a low speed which is a second exposure state as the exposure amount adjusting means. Any camera listed. The camera according to any one of claims 1 to 6, wherein the camera is a lens-fitted photo film unit in which a photographic film and a battery are loaded in advance at the time of manufacture.

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