JP2006085014A - Lens-fitted photographic film unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the selection of an unsuitable photographing mode while suppressing excess power consumption in a lens-fitted photographic film unit which is provided with a plurality of photographing modes having respectively different exposure conditions. <P>SOLUTION: When a vibration detection switch 30 detects vibration, power is supplied to respective parts of a printed board 29. A first decision circuit 52 to which power is supplied decides a suitable photographing mode by comparing whether an output signal from a photometric sensor 16 reaches a prescribed threshold or not. A second decision circuit 54 decides whether the photographing mode decided by the first decision circuit 52 decides to coincide with a photographing mode selected by an operation member 15 or not. An LED driver 58 turns on an OK LED 17 when both the photographing modes coincide with each other in accordance with the decided result of the second decision circuit 52, and when both the photographing modes are different from each other, turns on an NG LED 18 to inform a photographer of the decided result. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a lens-fitted photo film unit having a plurality of photographing modes having different exposure conditions.

  2. Description of the Related Art A lens-equipped film unit, which is a single use type simple camera preloaded with an unexposed photographic film, is known. This lens-equipped film unit is characterized by the fact that the photographing mechanism such as the shutter mechanism and the film winding mechanism is simplified and inexpensive, and the photographing operation is simple. ing.

  In the film unit with a lens, a plurality of products corresponding to various shooting scenes such as for nighttime, for approaching, for telephoto, and for continuous shooting have been sold with the spread of the unit. Furthermore, in recent years, a mode-switchable lens-equipped film unit with a plurality of shooting modes with different exposure conditions has appeared, as known from “Night & Day (trade name)” manufactured and sold by the present applicant. ing.

  With such a lens-equipped film unit, you do not know which shooting mode should be selected when shooting a scene that is neither too bright nor too dark, such as at dusk or in a bright indoor environment. There is a problem of end up. With a film unit with a lens, even if shooting is performed in an inappropriate shooting mode, the result cannot be known until development, so that important scenes cannot be kept clean.

  As a solution to this problem, a method of measuring light from a subject with a sensor and determining an appropriate shooting mode based on the measurement result can be considered. However, since the circuit provided for the determination naturally requires electric power, there is a concern that the battery may run out if the photometry is always performed. In the lens-fitted photo film unit, the battery cannot be replaced, so the battery exhaustion becomes a fatal problem.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lens-fitted photo film unit that suppresses unnecessary power consumption and prevents an inappropriate photographing mode from being selected.

  In order to solve the above problems, a lens-fitted photo film unit according to the present invention detects a vibration applied by mode selection means for selectively selecting a plurality of shooting modes, a photometric sensor for measuring light from a subject, and the like. A vibration detection switch, a photometry determination unit that is activated in response to the vibration detection switch detecting vibration and determines an appropriate shooting mode based on a measurement result of the photometry sensor, and a determination result of the photometry determination unit And an informing means for informing the photographer.

  In addition, after determining the appropriate shooting mode, the photometric determination unit determines whether the determined shooting mode matches the shooting mode selected by the mode selection unit, and the determination result is determined. It is preferable to notify the notification means.

  The vibration detection switch includes a plate-like first terminal, a plate-like second terminal provided substantially in parallel with the first terminal at a predetermined interval, and a hammer that is swingably held. Preferably, the vibration is detected by striking the second terminal with the hammer that swings in response to the applied vibration and bringing the second terminal into contact with the first terminal.

  Furthermore, it is preferable that the unexposed photographic film loaded in advance has a film sensitivity of ISO 1600 or more.

  According to the lens-fitted photo film unit of the present invention, the incident light quantity is measured by a photometric sensor, an appropriate shooting mode is determined based on the measurement result, and the determination result is notified to the photographer. Therefore, it is possible to know an appropriate shooting mode and to select an appropriate shooting mode even in a shooting scene in which it is not clear which shooting mode should be selected. In addition, since the notifying means alerts the photographer, forgetting to operate the mode selecting means can also be prevented.

  In addition, by activating the photometric determination unit that determines the appropriate shooting mode in response to the vibration detection switch detecting vibration, for example, no photometry is performed in a neglected and unused state. Can be suppressed.

  1 to 3 show the appearance of the lens-fitted photo film unit. 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 pasted around the outer periphery of the unit main body 3. . The label 4 is formed with an opening for exposing each part of the unit main body 3.

  A photographing lens 5, a finder 6, a photographing mode selection unit (mode selection means) 8 are provided on the front surface of the unit main body 3, and a photometric sensor 16 that measures light from the subject is exposed. Further, a release button 9 and a counter display window 10 are provided on the upper surface of the unit body 3, and a winding knob 12 used for winding the film after photographing, an OK LED 17 and an NG LED 18 as notification means on the back surface. Is provided. The LEDs 17 and 18 may be LEDs of the same color, or may be color-coded so that the photographer can easily distinguish, for example, the OK LED 17 is green and the NG LED 18 is red.

  The photographing mode selection unit 8 includes an operation opening 14 formed on the front surface of the unit main body 3 and a substantially oval operation member 15 that is rotatable within the operation opening 14. The operation member 15 rotates between a first operation position shown in FIG. 1 and a second operation position rotated clockwise from the first operation position shown in FIG.

  When the operation member 15 is in the first operation position, the lens-fitted photo film unit 2 is in the first photographing mode with a small aperture and a high-speed shutter. When the operation member 15 is in the second operation position, the second photographing mode for the large aperture and the low-speed shutter is set.

  FIG. 4 is an exploded perspective view schematically showing the configuration of the unit main body 3. The unit main body 3 includes a main body base 23 on which a 135 type film cartridge 22 is loaded, a photometric unit (photometric determination unit) 24 attached to the front side of the main body base 23, and a mode switching mechanism 25 for switching the photographing mode. And a front cover 26 and a rear cover 27 attached to the front side and the back side of the main body base 23. The film cartridge 22 may be other types such as IX240 type or Broni type.

  The film cartridge 22 includes a cartridge 22a and a photographic film 22b, and is loaded when the unit main body 3 is manufactured as described above. The photographic film 22b is preferably loaded with a high sensitivity film having a film sensitivity of ISO 1600 or higher. Thereby, it is possible to improve descriptiveness in a dark shooting scene without using a flash device such as a strobe.

  The photometric unit 24 includes a printed circuit board 29 on which various electric components are attached to form a photometric circuit, a vibration detection switch 30 mounted on the printed circuit board 29, a battery section 33 that connects the battery 32 to the photometric circuit, and the like. It is configured. In addition to the vibration detection switch 30, the photometric sensor 16 provided in the front direction and the OK LED 17 and the NG LED 18 provided in the back direction for notifying the photographer are mounted on the printed circuit board 29. Has been.

  A light shielding cylinder 35 is provided in the center of the front surface of the main body base 23. A shutter charge mechanism, a shutter mechanism, a film winding mechanism, a film winding mechanism, a film count 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 35. Yes. As these various mechanisms and the mode switching mechanism 25, known mechanisms may be used.

  FIG. 5 is an explanatory diagram schematically showing the configuration of the vibration detection switch 30 that detects vibration applied to the lens-fitted photo film unit 2. The vibration detection switch 30 includes a plate-shaped first terminal 40, a second terminal 42, and a hammer 44 that is swingably held by a case 46 about a shaft 44a. One end of each of the first terminal 40 and the second terminal 42 is held by the case 46, and lead wires 60 and 62 extending from the one end are connected to the printed circuit board 29 and the battery 32, respectively.

  The second terminal 42 is provided substantially parallel to the first terminal 40 at a predetermined interval as shown by a solid line in the drawing. For this reason, the vibration detection switch 30 is turned off when the lens-fitted photo film unit 2 is stationary or slowly moved.

  On the other hand, when the lens-fitted photo film unit 2 is largely moved, the hammer 44 swings about the shaft 44a and strikes the second terminal 42. The second terminal 42 struck by the hammer 44 is elastically deformed and comes into contact with the first terminal 40 as indicated by a two-dot chain line in the figure, and the vibration detection switch 30 is switched from OFF to ON to detect vibration.

  In this way, by configuring the vibration detection switch 30 with the two terminals 40 and 42 and the hammer 44, vibration detection can be performed at low cost. Further, the magnitude of vibration that can be detected depends on the rigidity of the second terminal 42, and the detection accuracy can be increased by reducing this rigidity. However, if the rigidity of the second terminal 42 is too low, there is a concern that vibration may be detected in situations other than shooting such as movement, so the second terminal 42 has rigidity that is not detected by movement. It is preferable. Alternatively, the rigidity of the second terminal 42 may be increased so that detection is not performed unless a large vibration is intentionally applied.

  Further, the vibration detection switch 30 having the above configuration detects only vibrations generated in the vertical direction in the figure. The direction of vibration detected by the vibration detection switch 30 may be any of the top, bottom, left and right, front and back directions of the lens-fitted photo film unit 2, or may be attached obliquely to detect a plurality of directions. Furthermore, vibrations in all directions may be detected by providing one each in the up / down, left / right, and front / rear directions. Note that vibrations generated when the photographer operates are usually in a plurality of directions, so there is no problem even if detection is performed in only one direction.

  FIG. 6 is a block diagram schematically showing the configuration of the photometry unit 24. The photometry circuit formed on the printed circuit board 29 includes a timer circuit 50, a first determination circuit 52, a second determination circuit 54, an amplifier 56, an LED driver 58, and the like.

  The timer circuit 50 is activated by power supplied from the battery 32 when the vibration detection switch 30 detects vibration. The activated timer circuit 50 measures a predetermined time, supplies power from the battery 32 to each part of the printed circuit board 29 only during this time, and stops after a predetermined time has elapsed. Note that the timing by the timer circuit 50 may be reset every time the vibration detection switch 30 detects vibration, or the next vibration detection is performed until a predetermined time has elapsed after receiving the first vibration detection. May not be accepted.

  The amplifier 56 converts the output signal of the photometric sensor 16 into, for example, a voltage of 0 to +5 V and inputs the voltage to the first determination circuit 52.

  The first determination circuit 52 is, for example, a comparator, compares whether or not the output signal of the photometric sensor 16 reaches a predetermined threshold value, and inputs the result to the second determination circuit 54. Since the output signal of the photometric sensor 16 increases or decreases according to the amount of incident light, when the output signal of the photometric sensor 16 is not more than a predetermined threshold value, the second photographing mode of the large aperture and the low-speed shutter is appropriate. When the output signal of the photometric sensor 16 is equal to or greater than a predetermined threshold value, it can be determined that the first photographing mode of the small aperture and the high speed shutter is appropriate.

  The second determination circuit 54 is, for example, an XOR gate (exclusive OR), and whether or not the shooting mode determined by the first determination circuit 52 matches the shooting mode selected by the operation member 15. And the determination result is input to the LED driver 58.

  According to the determination result of the second determination circuit 54, the LED driver 58 lights the OK LED 17 when the two shooting modes are matched, and lights the NG LED 18 when the shooting modes are not matched.

  Here, a determination operation when the first determination circuit 52 is a comparator, the second determination circuit 54 is an XOR gate, and the operation member 15 is a switch that is turned on when the operation member 15 is in the first operation position will be described. The first determination circuit 52, which is a comparator, outputs “0” when the output signal of the photometric sensor 16 is not more than a predetermined threshold value, and outputs “1” when it is not less than the predetermined threshold value. . As described above, it is determined that the second shooting mode is appropriate when the output value is “0”, and that the first shooting mode is appropriate when the output value is “1”. However, “1” and “0” are so-called truth values, and are expressed by + 5V and 0V, for example, on the circuit.

  Further, the operation member 15 is ON when it is at the first operation position and outputs “1”, and it is OFF when it is at the second operation position and outputs “0”. That is, both the first determination circuit 52 and the operation member 15 indicate the first imaging mode when the output value is “1”, and indicate the second imaging mode when the output value is “0”.

  The second determination circuit 54, which is an XOR gate, gives “0” to the LED driver 58 when the output of the first determination circuit 52 matches the output of the operation member 15, and “1” when it does not match. Output.

  The LED driver 58 lights the OK LED 17 when the output value of the second determination circuit 54 is “0”, and lights the NG LED 18 when the output value is “1”. As described above, the lens-fitted photo film unit 2 notifies the photographer whether or not an appropriate shooting mode has been selected.

  Note that the configuration of the photometric circuit formed on the printed circuit board 29 is not limited to the above, but by configuring the photometric circuit with logic as described above, the change in the output signal of the photometric sensor 16 and the photographer's The switching of the operation member 15 can be reflected on the LEDs 17 and 18 in real time, and the power consumption can be suppressed.

  As described above, according to the lens-fitted photo film unit 2 of the present embodiment, it is possible to notify the photographer whether or not an appropriate shooting mode is selected, so that the photographer knows the appropriate shooting mode in advance. It is possible to select an appropriate shooting mode even in a shooting scene in which it is not known which shooting mode should be selected. Further, since the LEDs 17 and 18 provided on the back surface prompt the photographer to pay attention, forgetting to operate the operation member 15 can be prevented.

  In addition, since the photometry circuit formed on the printed circuit board 29 is activated by detecting the vibration of the vibration detection switch 30, it suppresses unnecessary power consumption when carrying the lens unit without impairing the operability of the lens-fitted photo film unit 2. Can do.

  In the present embodiment, the LED is used as the notification means. However, the present invention is not limited to this. For example, other light emitting components such as a small light bulb may be used, or a display device such as a liquid crystal panel may be used. Also good. Furthermore, you may make it alert | report with a voice by providing a speaker.

  In the present embodiment, the second determination circuit 54 determines whether or not the shooting mode determined by the first determination circuit 52 matches the shooting mode selected by the operation member 15 (mode switching lever 84). Thus, it is notified whether or not an appropriate shooting mode is selected. For example, the determination result of the first determination circuit is input to the LED driver 58 to notify the shooting mode to be operated. It may be.

It is an external appearance perspective view which shows the state of the 1st imaging | photography mode of a film unit with a lens. It is an external appearance perspective view which shows the state of the 2nd imaging | photography mode of a film unit with a lens. It is the top view seen from the back direction which shows the composition of the film unit with a lens roughly. It is a disassembled perspective view which shows the structure of the film unit with a lens. It is explanatory drawing which shows the structure of a vibration detection switch roughly. It is a block diagram which shows the structure of a photometry unit roughly.

Explanation of symbols

2 Film unit with lens 5 Shooting lens 8 Shooting mode selection section (mode selection means)
16 Photometric sensor 17 OK LED (notification means)
18 NG LED (notification means)
22 Film Patrone 22b Photo Film 24 Photometric Unit (Metering Determination Unit)
30 Vibration detection switch 40 1st terminal 42 2nd terminal 44 Hammer

Claims (4)

In a film unit with a lens that has multiple shooting modes with different exposure conditions,
Mode selection means for selectively selecting the plurality of shooting modes;
A photometric sensor for measuring light from the subject;
A vibration detection switch for detecting the applied vibration;
The vibration detection switch is activated in response to detection of vibration, and a photometric determination unit that determines an appropriate shooting mode based on the measurement result of the photometric sensor,
A film unit with a lens, comprising: a notifying unit for notifying a photographer of a determination result of the photometric determination unit.   After determining an appropriate shooting mode, the photometric determination unit determines whether or not the determined shooting mode matches the shooting mode selected by the mode selection unit, and notifies the determination result of the notification. 2. The lens-fitted photo film unit according to claim 1, wherein the means is informed. The vibration detection switch includes a plate-like first terminal, a plate-like second terminal provided substantially parallel to the first terminal at a predetermined interval, and a hammer that is swingably held. ,
3. The vibration is detected by the hammer that swings in response to the applied vibration hits the second terminal, and the second terminal and the first terminal come into contact with each other. Film unit with lens as described. The film unit with a lens according to any one of claims 1 to 3, wherein an unexposed photographic film having a film sensitivity of ISO 1600 or more is loaded in advance.

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