JP2005283920A - Lens-fitted photo film unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To turn on the powers of various built-in devices for shooting before shooting and to reliably turn off the powers after shooting. <P>SOLUTION: A power switch 32 of a low luminance automatic emission circuit is exposed in a front face of a lens-fitted photo film unit 10. This power switch 32 is pressed by a finder frame 23 to turn off the power of the low luminance automatic emission circuit when a sports finder 18 is moved to a nonuse position where it falls on a front face of a unit body 11. When the sports finder 18 is moved to an operating position where it is protruded from the upper side of the unit body 11, the power switch 32 is closed to turn on the power of the low luminance automatic emission circuit. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a film unit with a lens in which a finder that protrudes to the outside during use and various electric devices that need to be turned off when not in use.

  Various types of lens-equipped film units are manufactured and sold as simple cameras pre-loaded with photographic films. In this lens-fitted photo film unit, the photographing mechanism is simplified in order to reduce the manufacturing cost, and the aperture, shutter speed, strobe light amount, etc. are fixed. For this reason, the range of shooting conditions in which a main subject such as a person and the background thereof can be properly shot is narrow, and if the subject brightness or the distance to the subject is out of the range, the shooting image quality is degraded.

  In order to solve the above-mentioned drawbacks of the lens-fitted photo film unit, the lens-fitted photo film unit described in Patent Document 1 incorporates an automatic iris switching device that measures the brightness of the subject and switches the iris according to the measured value. . In order to further improve the operability of the lens-fitted photo film unit, a low-brightness automatic light-emitting device that automatically emits strobe light according to subject brightness, an automatic shutter speed switching device, an automatic focal length switching device, an automatic filter switching device, etc. It is also considered to incorporate.

  Patent Document 2 discloses a film unit with a lens provided with a large finder protruding outside the main body in order to improve the snap photographing function of the film unit with lens. Further, Patent Document 3 discloses a film unit with a lens that includes a lens cover and switches on / off charging of the strobe device in conjunction with opening and closing of the lens cover.

JP 09-005817 A Japanese Utility Model Publication No. 62-065633 W099 / 18477

  The automatic aperture switching device, the low-brightness automatic light emitting device, the automatic shutter speed switching device, the automatic focal length switching device, the automatic filter switching device, etc. must measure the subject before the shutter release. Must be turned on. With a general compact camera, the switches of various devices can be linked to the main switch, or the power can be automatically turned off by a timer. However, since the lens-equipped film unit cannot incorporate such a function from the viewpoint of cost, it is necessary to individually provide a power switch.

  However, forgetting to turn off the power switches of the various devices described above causes a problem that the battery is exhausted and photography cannot be performed. In addition, since the lens-equipped film unit cannot be replaced with a battery, the lens-equipped film unit with the battery exhausted cannot be used.

  In order to solve the above-described problems, the present invention provides a lens-fitted film unit that can turn on the power of various built-in photographing devices before photographing and can reliably turn off the power at the end of photographing. For the purpose.

  The lens-fitted photo film unit of the present invention includes a finder that is movable between a use position protruding outside from the outer dimensions of the main body and a non-use position stored within the outer dimensions of the main body, a battery, An electric device that operates using this battery as a power source is provided, and a power switch that switches on / off of the electric device in conjunction with the movement between the use position and the non-use position of the finder is provided. .

  Further, as the electric device, a low-brightness automatic light emitting device, an automatic aperture switching device, an automatic shutter speed switching device, an automatic focal length switching device, an automatic filter switching device, or the like was used.

  According to the lens-fitted photo film unit of the present invention, when the finder is moved to the use position for photographing, the electric device is turned on. In addition, if the viewfinder is housed in a non-use position after shooting, the power of the electric device is turned off, so that the battery is not consumed due to forgetting to turn off the power.

  A first embodiment of the present invention will be described. 1A and 1B show a lens-fitted photo film unit using a first embodiment of the present invention. As is well known, the lens-fitted photo film unit 10 is a one-time use type camera in which an unexposed photographic film is previously loaded in a unit main body 11 having a simple exposure mechanism. The unit main body 11 includes a main body base to which a film storage chamber, an exposure mechanism, a strobe device, and the like are attached, and a front cover and a rear cover that cover the main body base from the front and rear. On the front surface of the unit main body 11, a photographing lens 12, a strobe light emitting unit 13, and the like are exposed.

  On the upper surface of the unit body 11, a release button 16, a counter 17 indicating the number of shots, a sports finder 18 and the like are provided. As shown in FIG. 1 (A), the sports finder 18 is between a use position protruding on the unit body 11 and a non-use position where the sport finder 18 is laid down on the front surface of the unit body 11 as shown in FIG. 1 (B). It is pivotally supported so that it can rotate freely. On the upper surface of the unit main body 11, a pair of locking portions 19 for locking the sports finder 18 moved to the use position is provided. In addition, a locking portion 20 is provided on the front surface of the unit main body 11 to lock the sports finder 18 lying in the unused position.

  The sports finder 18 includes a rectangular finder frame 23 and a finder lens 24 fitted in the finder frame 23. As the finder lens 24, for example, a thin concave Fresnel lens formed in a substantially flat plate shape is used. Since the sports finder 18 can perform framing with the lens-fitted film unit 10 away from the face, it is suitable for shooting fast-moving sports or snap shooting for instant framing.

  A light receiving window 27 is provided on the front surface of the unit main body 11 at a position hidden by the finder frame 23 when the sports finder 18 is laid down to a non-use position. A photometric element 28 (see FIG. 2) such as CdS is incorporated in the back of the light receiving window 27. When the sports finder 18 is moved to the use position, the luminance of the subject is measured by the photometric element 28. be able to.

  Under the light receiving window 27, the power switch 32 of the low brightness automatic light emitting circuit 31 incorporated in the unit body 11 is exposed. As shown in FIG. 3, the power switch 32 is composed of a pair of elastic metal contact pieces 33 and 34 incorporated in the automatically raised light emission circuit 31, and when the sports finder 18 is laid down to a non-use position. The bent portion 33a of one metal contact piece 33 is pressed by the finder frame 23 and retracted into the unit main body 11, and the low brightness automatic light emitting circuit 31 is turned off by moving away from the other metal contact piece 34. In addition, when the sports finder 18 is moved to the use position, the low brightness automatic light emitting circuit 31 is turned on by one metal contact piece 33 being brought into contact with the other metal contact piece 34 due to elasticity and conducting. .

  FIG. 2 is a block diagram showing a configuration of the low-brightness automatic light emission circuit 31. As shown in FIG. The low brightness automatic light emission circuit 31 includes a strobe circuit unit 36 and a brightness determination circuit unit 37. The strobe circuit unit 36 includes a booster unit 38, a strobe discharge tube 39, a trigger unit 40, and a sync switch 41. The luminance determination circuit unit 37 includes a power switch 32, a photometric element 28, a received light signal processing unit 43, and a luminance level determination unit 44. Power is supplied to the strobe circuit unit 36 and the luminance determination circuit unit 37 by a battery 45 set in the lens-fitted photo film unit 10.

  When the sports finder 18 is moved to the use position and the power switch 32 is turned on, the low brightness automatic light emission circuit 31 is activated. The photometric element 28 has a resistance value that changes according to the amount of light received, and the received light signal processing unit 43 generates a photometric signal from the resistance value of the photometric element 28 that has changed according to the subject luminance and inputs the photometric signal to the luminance level determining unit 44. The brightness level determination unit 44 includes, for example, a comparator, and determines the level of subject brightness by comparing the voltage of the photometric signal input from the received light signal processing unit 43 with a preset reference voltage. When the luminance level determination unit 44 determines that the subject luminance is low, the luminance level determination unit 44 operates the boosting unit 38 of the strobe circuit unit 36.

  The booster 38 boosts the current supplied from the battery 45 for driving the strobe and charges the main capacitor for light emission and the trigger capacitor for trigger. When the release button 16 is operated after the charging is completed, the shutter mechanism 47 operates, and for example, the sync switch 41 is pressed by the shutter blade to turn it on. When the sync switch 41 is turned on, the trigger unit 40 is activated and the trigger capacitor is discharged. As a result, a trigger voltage is applied to the strobe discharge tube 39, and the main capacitor is discharged through the strobe discharge tube 39, whereby strobe light emission is performed.

  In the low-brightness automatic light emitting circuit 31, the power switch 32 is turned off when the sports finder 18 is tilted to the non-use position, so that the battery 45 is not consumed due to forgetting to turn off the power switch 32. If you do not want to use the flash even when shooting in a low-brightness environment, press the power switch 32 with your finger to turn off the low-brightness automatic light-emitting circuit 31 to stop the flash. be able to.

  Next, a second embodiment in which an automatic aperture switching mechanism is incorporated in the lens-fitted film unit 10 will be described. As shown in FIG. 4, the automatic diaphragm switching mechanism 50 includes a small-diameter hole 51a and a large-diameter hole 51b, and a diaphragm switching plate 52 that is pivotably mounted by a shaft mounting portion 52a. And a solenoid 53 for swinging 52. The aperture switching plate 52 is disposed between an open aperture hole 54 provided in the shutter mechanism of the lens-fitted photo film unit 10 and the photographing lens 55, and swings to form a small-diameter hole 51a in the aperture opening 51. One of the large-diameter holes 51b is arranged in front of the open throttle hole 54 to switch the diaphragm.

  The solenoid 53 includes a substantially cylindrical casing 56, an iron plunger 57 incorporated in the casing 56 so as to be movable along the axial direction, and the plunger 57 in the axial direction by electromagnetic force. And a coil spring 59 and a coil spring 59. The plunger 57 is integrally provided with an arm portion 57 a that protrudes from the housing 56. The arm portion 57a has a form in which two disks 57c and 57d are provided at a predetermined interval on one end side of the shaft 57b. The coil spring 59 is incorporated between the disc 57 d and the housing 56, and biases the arm portion 57 a toward the protruding direction away from the housing 56.

  As shown in FIG. 5A, on the upper part of the aperture switching plate 52, a drive pin 52b inserted between the disc 57c and the disc 57d of the arm portion 57a of the solenoid 53 is integrally provided. . The plunger 57 of the solenoid 53 when not energized protrudes from the housing 56 by the bias of the coil spring 59. In this case, the diaphragm switching plate 52 has the small diameter hole 51 a disposed in front of the open diaphragm hole 54. When the solenoid 53 is energized, the plunger 57 slides to the right in the figure by the electromagnetic force of the coil as shown in FIG. 5B, so that a part of the shaft 57b of the arm portion 57a is coil spring 59. It is drawn into the housing 56 against the urging of. Due to the movement of the arm portion 57 a, the drive pin 52 b is pushed to swing the diaphragm switching plate 52, and the large diameter hole 51 b is disposed in front of the open throttle hole 54.

  The solenoid 53 is driven by a driver 60. The driver 60 is formed of, for example, a transistor, and energizes the solenoid 53 in accordance with a drive signal transmitted by the luminance determination circuit unit 37 described in the first embodiment when the subject luminance is low. Therefore, when the sports finder 18 is moved to the non-use position, the power of the luminance determination circuit unit 37 is turned off and the solenoid 53 is not energized, so that the battery is not consumed due to forgetting to turn off the power switch. If you do not want to use the flash even when shooting in a low-brightness environment, press the power switch 32 with your finger to turn off the low-brightness automatic light-emitting circuit 31 to stop the flash. be able to.

  Next, a third embodiment in which an automatic shutter speed switching mechanism is incorporated in the lens-fitted photo film unit 10 will be described. As shown in FIG. 6, the automatic shutter speed switching mechanism 62 includes a swinging shutter blade 63, a switching ring 64 that rotates in front of the shutter blade 63, and the rotation of the switching ring 64. It comprises a swinging blade receiving member 65 and a solenoid 66. Since the solenoid 66 is the same as the solenoid 53 of the second embodiment described above, detailed description is omitted.

  The shutter blade 63 is normally biased by a spring 67 and closes the photographing opening 68 on the photographing optical path. When the shutter mechanism of the lens-fitted photo film unit 10 is actuated, the upper part 63a of the shutter blade 63 is pressed from the left to the right in the figure, and rotates in the clockwise direction in the figure around the shaft attachment hole 63b to take a photographing opening. 68 is opened.

  The switching ring 64 is a ring-shaped member that is rotatable around the photographing optical axis, and has a drive pin 64a that protrudes forward. The drive pin 64a is inserted between the two disks 66b and 66c of the arm portion 66a of the solenoid 66, and the switching ring 64 is rotated by the movement of the plunger. When the solenoid 66 is in a non-energized state, the arm portion 66a protrudes downward from the housing 66e by the bias of the coil spring 66d, and the switching ring 64 is set at the high-speed shutter position shown in the drawing. When the solenoid 66 is energized and the arm portion 66a is slid upward against the bias of the coil spring 66d, the switching ring 64 rotates counterclockwise in the drawing and is set at the low-speed shutter position. .

  A pair of protrusions 64b are provided on the outer periphery of the switching ring 64, and the drive arm 65b of the blade receiving member 65 is sandwiched between the protrusions 64b. The blade receiving member 65 includes a bearing portion 65a that is rotatably supported in the unit main body 10, and a drive arm 65b and a blade receiving arm 65c protruding from the bearing portion 65a.

  As shown in FIG. 7A, the blade receiving arm 65c of the blade receiving member 65 is positioned within the rotation trajectory of the speed switching piece 63c of the shutter blade 63 when the switching ring 64 is in the high-speed shutter position. Yes. Therefore, when the shutter blade 63 rotates in this state, the speed switching piece 63c collides with the blade receiving arm 65c of the blade receiving member 65 and the rotation of the shutter blade 63 in the opening direction is prevented, so that the shutter speed is high. become. Further, as shown in FIG. 5B, when the switching ring 64 is in the low-speed shutter position, the blade receiving arm 65c is located outside the rotation locus of the speed switching piece 63c of the shutter blade 63. Therefore, since the speed switching piece 63c does not hit the blade receiving arm 65c, the amount of rotation of the shutter blade 63 increases and the shutter speed decreases.

  The solenoid 66 is driven by a driver 69. The driver 69 energizes the solenoid 66 in accordance with a drive signal transmitted by the luminance determination circuit unit 37 described in the first embodiment when the subject luminance is low. For this reason, when the sports finder 18 is moved to the non-use position, the power of the luminance determination circuit unit 37 is turned off and the solenoid 66 is not energized, so that the battery is not consumed due to forgetting to turn off the power switch.

  Next, a description will be given of a fourth embodiment in which an automatic filter switching mechanism is incorporated in the lens-fitted photo film unit 10. As shown in FIG. 8, the automatic filter switching mechanism 70 includes a swinging filter plate 71 and a solenoid 72. The filter plate 71 is pivotally mounted using a shaft mounting hole 71 a, and one end thereof is inserted into and removed from the front of the photographing lens 73. Since the solenoid 72 is the same as the solenoids 53 and 66 in the above embodiments, detailed description is omitted.

  The other end of the filter plate 71 is integrally provided with a drive pin 74 disposed along the optical axis direction. The drive pin 74 is inserted between the two discs 72b and 72c of the arm portion 72a of the solenoid 72. When the solenoid 72 is in a non-energized state, the arm portion 72a protrudes downward by a coil spring 72d. The filter plate 71 linked to the arm portion 72 a by the drive pin 74 is inserted in front of the photographing lens 73. When the solenoid 72 is energized, the arm portion 72a is moved upward against the bias of the coil spring 72d, and the filter plate 71 whose drive pin 74 is pressed by the arm portion 72a is swung clockwise in the figure. It is moved and retracted from the front of the taking lens 73.

  The solenoid 72 is driven by a driver 76. The driver 76 energizes the solenoid 72 in accordance with a drive signal transmitted when the luminance determination circuit unit 37 described in the first embodiment has a high subject luminance. Therefore, when the sports finder 18 is moved to the non-use position, the power of the luminance determination circuit unit 37 is turned off and the solenoid 72 is not energized, so that the battery is not consumed due to forgetting to turn off the power switch.

  As the filter plate 71, for example, an ND filter or a color filter is used. In addition, a high-sensitivity film suitable for the color temperature of illumination light indoors or at night is loaded in the lens-fitted photo film unit 10, and when photographing outdoors during the daytime, a high brightness is detected and a filter for color correction and density correction is provided. It may be inserted. Alternatively, the filter may be always inserted in front of the photographic lens, and the density and color of the filter itself may be changed according to the luminance.

  Next, a description will be given of a fifth embodiment in which an automatic focus switching mechanism is incorporated into the lens-fitted photo film unit 10. As shown in FIG. 9, the automatic focus switching mechanism 80 includes a rotatable switching ring 81, a lens holder 83 that holds a photographing lens 82, a solenoid 84, and an interlocking lever that interlocks the switching ring 81 and the solenoid 84. 85. The solenoid 84 is the same as the solenoids 53, 66, and 72 in the above embodiments, and a detailed description thereof will be omitted.

  The interlocking lever 85 is pivotally mounted using a shaft mounting hole 85a. A drive pin 85b provided at one end is provided on the arm portion 84a of the solenoid 84, and an action pin 85c provided on the other end. The switching ring 81 is inserted into the long hole 81a. The lens holder 83 is movable along the optical axis direction by a guide shaft 83 b supported in the lens-fitted photo film unit 10, and is urged to the rear of the photographing optical axis by a spring 86.

  As shown in the figure, when the solenoid 84 is in a non-energized state, the arm portion 84a protrudes upward by the bias of the coil spring 84b, and the lens holder 83 is moved by the inclined portion 81b provided on the front surface of the switching ring 81. The contact shaft 83a is pressed. As a result, the photographing lens 82 is moved forward along the photographing optical axis, so that the focus position of the lens is set to the near side.

  When the solenoid 84 is energized, the arm portion 84a is moved downward against the bias of the coil spring 84b, and the interlocking lever 85 rotates counterclockwise in the drawing and the switching ring 81 rotates clockwise. . As a result, the inclined portion 81b of the switching ring 81 and the contact shaft 83a do not come into contact with each other, so that the photographing lens 82 moves rearward of the photographing optical axis by the bias of the spring 86, and the focus position of the lens is set on the far side. Is done.

  The solenoid 84 is driven by a driver 88. The driver 88 is driven by an autofocus circuit 89 that measures the subject distance. The autofocus circuit 89 is turned on / off by the power switch 90 having the same configuration as that of the power switch 32 described in the first embodiment. Therefore, when the sports finder 18 is set at the non-use position, the solenoid 84 is The battery is not energized, and the battery is not consumed due to forgetting to turn off the power switch.

  In each of the above embodiments, each device or mechanism is incorporated into the lens-fitted photo film unit one by one. However, the mechanisms may be appropriately combined and incorporated into the lens-fitted photo film unit, or all mechanisms may be incorporated.

It is a perspective view which shows the external appearance shape of the film unit with a lens. It is a block diagram which shows the structure of a low-intensity automatic light emission circuit. It is an external appearance perspective view which shows the structure of a power switch. It is a perspective view which shows the structure of an automatic aperture switching mechanism. It is explanatory drawing which shows the operation state of an automatic aperture switching mechanism. It is a perspective view which shows the structure of an automatic shutter speed switching mechanism. It is explanatory drawing which shows the operation state of an automatic shutter speed switching mechanism. It is a perspective view which shows the structure of an automatic filter switching mechanism. It is a perspective view which shows the structure of an automatic focal distance switching mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Film unit with a lens 11 Unit main body 17 Light receiving window 18 Sports finder 31 Low brightness automatic light emission circuit 32 Power switch 36 Strobe circuit part 37 Brightness judgment circuit part 50 Automatic aperture switching mechanism 60 Automatic shutter speed switching mechanism 70 Automatic filter switching mechanism 80 Automatic Focal length switching mechanism

Claims (6)

A viewfinder, a battery, and an electric power source that operates using the battery as a power source. The viewfinder is movable between a use position protruding outside from the outer dimensions of the main body and a non-use position stored in the outer dimensions of the main body. In a film unit with a lens provided with a device,
A film unit with a lens, comprising a power switch for switching on / off the power supply of the electric device in conjunction with the movement of the finder between a use position and a non-use position.   2. The lens-equipped film unit according to claim 1, wherein the electric device is a low-brightness automatic light-emitting device that measures the brightness of a subject and automatically causes the strobe device to emit light when the luminance is low.   2. The lens-fitted photo film unit according to claim 1, wherein the electric device is an automatic aperture switching device that automatically switches the aperture by measuring the luminance of a subject.   2. The lens-fitted photo film unit according to claim 1, wherein the electric device is an automatic shutter speed switching device that automatically switches a shutter speed by measuring a luminance of a subject.   The film unit with a lens according to claim 1, wherein the electrical device is an automatic focal length switching device that automatically switches a focal length by measuring a distance to a subject.   2. The lens-fitted photo film unit according to claim 1, wherein the electric device is an automatic filter switching device that measures the luminance of a subject and switches a filter in a photographing optical path.

Images