JP2001027792A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a satisfactory photograph in proper exposure at the appropriate density ratio of a main subject to background not only in photographing in a room and at night but also in photographing using a stroboscope outdoors and in the daytime by providing an adjusting mechanism, etc., changing exposure in accordance with a light quantity signal and a means for adjusting strobe light quantity to a subject in accordance with a subject signal. SOLUTION: When the light quantity of the subject is small, the deflection quantity of a needle 57a is small and the needle 57a is at an opposed position to the high surface of a cam surface 51b. When a shutter button 21 is half- depressed in such a state, a projection 21b presses up an interlocking lever 63. Thus, a cam plate 51 is turned counterclockwise. When the cam plate 51 is turned, an actuation pin 58 is moved upward and diaphragm plates 54 and 55 are mutually turned, so that a diaphragm aperture is formed to have a large diameter. Furthermore, when the button 21 is fully depressed, a shutter blade is opened and closed and a synchro switch is turned on to adjust the strobe light quantity to the subject and the strobe light is emitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens capable of taking a photograph having an appropriate density in any photographing environment. In particular, in a film unit with a lens capable of taking a photograph having an appropriate main subject / background density ratio when photographing a low-luminance subject, a film with a lens capable of taking an appropriate main subject / background density ratio even when a daylight strobe is used. About the unit.

[0002]

2. Description of the Related Art Various types of lens-equipped film units have been sold in which unexposed photographic films are loaded in a unit body having a simple photographing mechanism such as a photographing lens, a shutter device, a film winding device and the like at the time of manufacture. Some film units with a built-in flash unit incorporate a flash unit to enable shooting in dark places such as at night or indoors.

[0003] In a film unit with a built-in strobe, a combination of a shutter speed, an aperture value and a film sensitivity is set so as to correspond to the brightness in the daytime. It is designed so that flash photography that is appropriate for a main subject at a shooting distance of about 4 m is performed.

However, when flash photography is performed indoors or outdoors at night using a conventional film unit with a built-in flash and a lens, a main subject such as a person is overexposed, whereas the background is considerably underexposed. I can't get a satisfactory print photo. As one means for solving such a problem, Japanese Patent Application Laid-Open No. 10-33328
As disclosed in Japanese Patent No. 7, there is a method of balancing the density of the main subject and the background by using a film of ISO 600 or more and setting the f-number of the aperture to F8 or less only during flash shooting. However, in this method, the quality is not improved if no strobe is used in indoor or nighttime shooting.If the strobe is used outdoors during the daytime, the overexposure exceeds the film latitude and the print quality is greatly reduced. Had disadvantages.

In Japanese Patent Application Laid-Open No. 10-333287,
A method of changing the shutter speed in conjunction with a strobe switch is disclosed, but it is difficult to secure the accuracy of the shutter speed switching in terms of manufacturing appropriateness,
In addition, the low-speed shutter causes a reduction in image quality such as camera shake and the like, which has been a factor of reducing the sharpness of a photographic print.

In Japanese Patent Application Laid-Open No. Hei 10-260507,
A lens-equipped film unit comprising a photometric circuit for detecting the level of subject brightness with respect to a predetermined brightness, and aperture switching means for switching an aperture value according to the level of subject brightness detected by the photometric circuit is disclosed. I have. This patent application further states that it is preferable to control the presence or absence of strobe light emission in accordance with the detection result of the photometric circuit. However, in the film unit with a lens disclosed herein, underexposed photographs can be reduced as compared with the conventional film unit with a lens, but it is not possible to take a photograph in which the density of the main subject and the background is balanced. It turned out to be difficult. There is also a disadvantage that the strobe automatically emits light even in an environment where the strobe must not be used. In addition, in the case of backlit scenes outdoors during the daytime, the main subject /
Even in a scene where the background density ratio is improved, the user cannot select strobe light emission.

In a film unit with a lens disclosed in Japanese Patent Application Laid-Open No. 9-5817, a diaphragm plate having a diaphragm opening formed by measuring the quantity of light of a subject with a photoconductive element and operating an electromagnet in accordance with the photometric value. Is moved to adjust the aperture. According to this, since exposure control can be automatically performed according to the amount of light of the subject, anyone can easily shoot with an appropriate exposure amount. However, although the film unit with the lens can improve the quality of overexposure, the improvement of the main subject / background density ratio when photographing a low-luminance subject is insufficient.

[0008]

In order to solve these problems, the present inventors have made it possible for a user to select an appropriate main subject / background density ratio and whether or not to use a strobe when shooting indoors or at night. Also, a film unit with a lens which can provide a preferable photograph within appropriate exposure can be provided irrespective of the use of a strobe even during daytime outdoor shooting.

That is, there is provided a photographing mechanism having a photographing lens, a fixed-speed shutter device, an aperture and a strobe device,
In a film unit with a lens loaded with an unexposed photographic film in advance, the shutter speed of the shutter device is set to T seconds, and the guide number of the strobe device is set to G (I
SO100 · m), a photometric unit that satisfies the relationship of 7.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) ≦ 12.5 and outputs a light amount signal corresponding to the object light amount A film unit with a lens, comprising an adjusting mechanism for changing an exposure amount to the film in accordance with the light amount signal.

[0010] However, in the film unit with the lens, when a strobe is used outdoors during the daytime, the main subject is recorded at an appropriate density, but the background flies white on a print or the main subject is shaded. Despite the use of a strobe light for the purpose of removing, there is a drawback that only photographs with too strong shadows can be taken.

The present invention solves the above-mentioned problems, and it is preferable that the main subject / background density ratio and the appropriate exposure be within an appropriate exposure not only when photographing indoors and at night but also when a strobe is used outdoors during the day. An object of the present invention is to provide a film unit with a lens capable of providing a photograph. That is, an object of the present invention is to provide a film unit with a lens that can provide an appropriate photograph in any photographing environment.

[0012]

The above object has been achieved by the following method.

(1) A film unit with a lens provided with a photographing mechanism having a photographing lens, a shutter device, an aperture, and a strobe device and previously loaded with an unexposed photographic film outputs a light amount signal corresponding to the light amount of the object. A lens-equipped film comprising: a photometric unit; and an adjusting mechanism for changing an exposure amount of the film according to the light amount signal, and a unit for adjusting a strobe light amount to a subject in accordance with the subject signal. unit.

(2) The device according to (1), wherein the means for adjusting the amount of strobe light includes a filter for dimming disposed on the front surface of the strobe light emitting section, and means for moving the filter. The film unit with the lens described.

(3) The means for adjusting the amount of strobe light includes an electro-optic modulation element whose light transmittance changes in accordance with an applied voltage (1).
The film unit with a lens according to 1.

(4) The strobe light amount adjusting means adjusts the strobe light amount by weakening the strobe light amount when the subject light amount is small and increasing the strobe light amount when the subject light amount is large. The film unit with a lens according to any one of (1) to (3).

(5) The shutter device has a fixed speed, and the shutter speed of the shutter device is T seconds.
When the smallest guide number when the subject light amount of the strobe device is small is G (ISO100 · m), the following relationship is established: 7.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) ≦ 12.5 The film unit with a lens according to (4), wherein the film unit is satisfied.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A film unit with a lens according to the present invention is provided with photometric means for outputting a light amount signal corresponding to a light amount of a subject, and an adjusting mechanism for changing an exposure amount to the film according to the light amount signal. It is characterized by.

As photometric means for measuring the light quantity of the subject,
Most simply, CdS (cadmium sulfide) can be used. In addition, a solar cell, a CCD, a MOS transistor, a photodiode, selenium, or the like may be used. Usually, an element that outputs a photometric result as an electric signal is easily used.

As the means for changing the amount of exposure to the film, a method of changing the aperture value, a method of adjusting the amount of light transmitted to the lens using an ND filter, or the like can be used. The change of the exposure amount is, in the simplest case, to have a two-stage adjusting means of a large exposure amount and a small exposure amount. When the aperture value is changed, the aperture plate having two types of aperture diameters can be inserted and removed, and when the amount of transmitted light is adjusted, the ND filter can be inserted and removed. In some cases, the exposure amount may be further adjusted in multiple stages, or the exposure amount may be continuously adjusted in a continuous step.

When the exposure amount is adjusted in two stages, a predetermined subject luminance to be switched is determined in advance. That is, when the brightness is higher than a predetermined subject brightness, the exposure amount is reduced, and when the brightness is lower than the predetermined brightness, the exposure amount is increased. The signal output by the photometric means is compared with the predetermined luminance in this way, and is connected to a mechanism for switching the exposure amount according to the result of the magnitude. The method of switching the aperture can be realized by a method of physically operating the aperture plate, a method of substantially changing the aperture value by changing the density of the liquid crystal, or the like. As a method of physically operating the aperture plate, as disclosed in Japanese Patent Application Laid-Open No. H10-260507, a shape memory element whose shape changes depending on the presence or absence of energization can be used.

A method of moving the aperture plate by a motor can also be used. Further, as disclosed in JP-A-9-5817, it can be moved by using an electromagnet. The electric power required to move the aperture plate can be obtained from a dry cell or secondary battery for the strobe, or a design that requires the aperture plate to be moved only when the brightness is higher than a predetermined level. You may get.

[0023] In the present invention, an adjustable brightest aperture said photometry means is set when object luminance is low detected when the F _1, satisfy the relationship of 4.0 ≦ F ₁ ≦ 8.0 desirable. Most preferably, the relationship of 5.0 ≦ F ₁ ≦ 7.0 is satisfied.

However, in the case where the exposure amount is adjusted by the transmitted light amount of an ND filter or the like, the aperture value is specified by an aperture value that gives substantially the same exposure amount. The aperture value was determined based on the brightness required to capture the background in nighttime indoor photography and the depth of field required for a film with a lens having a fixed focus and a fixed shutter speed. In order to achieve the above object, it is desirable to use a film of ISO 1000 or more. By satisfying these requirements, a high shutter speed can be set, and a sharp picture free of camera shake and subject shake can be taken.

[0025] In the present invention, an adjustable darkest aperture said photometry means is set when a high subject luminance detected when the F _2, satisfies the relationship 12.0 ≦ F ₂ ≦ 32 It is desirable. By satisfying this requirement, even if a high-brightness subject is photographed outdoors during the daytime, the exposure to the film can be kept within an appropriate exposure range, and a high-quality photographic print can be provided. .

The film unit with a lens according to the present invention comprises:
There is a means for adjusting the amount of strobe light according to the amount of light of the subject. In the simplest case, two-stage adjustment of a small light amount strobe and a large light amount strobe is performed in accordance with the light amount of a subject. However, more steps or unauthorized adjustment may be performed.

The strobe light amount adjusting means may be any means capable of adjusting the desired strobe light amount, but a preferred means will be described.

The first means is provided with two types of main capacitors. In other words, a large-capacity main condenser for high-light strobes and a small-capacity main condenser for small-light strobes are placed in the film unit with a lens. Select automatically. With this means, two-step light amount adjustment can be performed.

Another means is to adjust the light emission amount by controlling the light emission stop timing by an electric circuit. With this means, the light amount can be adjusted at any stage.

Still another means is performed by moving a dimming filter to the front of the strobe light emitting section. Any filter may be used as the dimming filter as long as it can reduce the amount of strobe light. That is, a simple ND filter, a diffusion plate, a plate with many pores, or the like can be used.

Still another means is to mount an electro-optic modulation element whose light transmittance changes in accordance with an applied voltage on the front surface of a strobe light emitting section, and to flow an electric signal as a result of exposure adjustment to the element. This adjusts the amount of strobe light. A disc-shaped guest-host liquid crystal plate (GH liquid crystal plate) can be used as the electro-optic modulation element. The GH liquid crystal plate is formed by forming a transparent conductive film and an alignment film on a pair of transparent substrates. And a gap is filled with a GH liquid crystal in which a nematic liquid crystal and a dichroic dye are mixed. When an AC voltage is applied between the pair of transparent conductive films and an electrode is applied between the electrodes, the voltage becomes higher or lower. Changes the light transmittance. In the present embodiment, a GH liquid crystal plate having a voltage-light transmittance characteristic as shown in Table 1 was used. The light transmittance of this GH liquid crystal plate is about 2 Vr from the state where no voltage is applied.
ms, the light transmittance gradually decreases as the applied voltage increases, and saturates to the minimum light transmittance (about 10%) at about 5 Vrms. That is, the strobe light amount can be adjusted about seven times.

[0032]

[Table 1]

In the present invention, control is performed such that the exposure amount is increased and the strobe light amount is reduced when the subject light amount is small, and the exposure amount is reduced and the strobe light amount is increased when the subject light amount is large. Most ideally, the control is performed so that the increase / decrease of the exposure amount × the strobe light amount becomes constant. That is, when the exposure amount is halved, the strobe light amount is doubled. More specifically, the exposure is changed by changing the aperture by two steps, such as (small subject light quantity) F ₁ = 5.6 Gno = 5.0 (large subject light quantity) F ₂ = 11 Gno = 10.0 When the amount is reduced to 1/4, it is preferable that the amount of strobe light is also quadrupled.

Another preferred control method is to control the amount of strobe light only in accordance with the amount of light of the subject, completely independently of the control of the amount of exposure. Most ideally, the subject light amount and the strobe light amount are proportional. More specifically, when (subject light amount) LV7 Gno = 5.0 (minimum value) (subject light amount) LV14 Gno = 10.0 (maximum value), continuous between LV7 to LV14 The strobe light quantity is changed linearly and linearly. By performing such strobe light amount control, a photograph with a stable main subject / background density ratio can be taken even if there is a slight change in shooting conditions in continuous scenes.

The lens-equipped film unit of the present invention has the following structure: 7.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) in order to properly balance the density ratio between the main subject and the background when using a strobe. It is preferable to satisfy the following relationship: ≦ 12.5. Here, the shutter speed of the shutter device is set to T seconds, and the guide number of the strobe device when the subject light amount is small is G (IS
O100 · m). As a result of extensive studies by the inventors, it has been found that when the above relationship is satisfied, the density ratio between the main subject irradiated with the strobe and the background where the strobe light does not reach is appropriately reproduced on the print. By combining the guide number, the shutter speed and the aperture switching method, and the strobe light amount switching method when the amount of light of the subject that satisfies this condition is small, not only in the nighttime indoors, but also in the daytime outdoor flash photography. It has been found that a print having an appropriate exposure amount for the entire print and an appropriate main subject / background density ratio can be provided.

The film unit with a lens according to the present invention comprises:
More preferably, the relationship of 9.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) ≦ 11.0 is satisfied.

The photosensitive material used in the present invention is ISO6
Color negative films of 40 or more are preferable, and ISO10
More preferably, the color negative film is 00 or more. As for the requirements for a color negative film, in addition to sensitivity, granularity, color reproducibility, and suitability for a fluorescent lamp are extremely important for the present invention. In order to improve the graininess while increasing the sensitivity, it is preferable to use high aspect ratio tabular grains having an aspect ratio of 8 or more. The color reproducibility is R
It is desirable to have a spectral sensitivity that enables faithful color reproduction based on the GB color matching function.
No. 96 realizes using the fourth color-sensitive layer,
This is a preferred means of realization. In addition, by creating a color negative film capable of reproducing colors close to such faithful color reproduction, the color of a white fluorescent lamp is not recorded in a greenish color unlike a conventional color negative film. Will be recorded. This performance is a very important property for producing a photographic print with favorable color reproduction.

The latitude of a color negative film is also important. The latitude of the color negative film used in the present invention preferably has a latitude at which an appropriate photographic print can be obtained at an exposure amount of -1 to +4, and more preferably a latitude of -2 to +5 at an exposure amount. Is to have.

The standard of the photographic film cartridge may be IX240 type or 135 type.

When the film unit with the lens of the present invention is photographed in an environment with low brightness, a strobe is used at the discretion of the user. When a strobe is used in such a shooting environment, a subject to which the strobe is illuminated and a background illuminated by a background light source to which the strobe does not reach are simultaneously photographed on the screen. Even in such a case, in order to provide a photographic print with appropriate color reproduction, use a color negative film capable of faithful color reproduction and match the color reproducibility of the color negative film loaded in the film with lens It is preferable to use a strobe device having such a spectral energy distribution. "Match" means that the strobe light color seen from the color negative film is close to the background light source color seen from the color negative film, and considering the shooting frequency distribution, a white fluorescent light is selected as the background light source color. The most preferable method is to set the spectral energy distribution of the strobe to be recorded on a color film with a color close to the light color.

[0041]

FIG. 2 shows the appearance of a film unit 11 with a lens. The film unit 11 with a lens has a finder objective window 12 and a photographing window 14 exposing a photographing lens 13 on its front surface.
A strobe light emission window 16 is provided. It is preferable to use a lens having an F-number brighter than 7, that is, a lens having an F-number ≦ 7. In this embodiment, an F number = 6.7 is used. Strobe light emission window
Below the 16, a strobe charging switch 17 is slidably provided. When the flash charging switch 17 is slid, flash charging is started.

A solar cell 18 is mounted beside the strobe charging switch 17. This solar cell 18 is a photometric unit for adjusting the aperture according to the amount of light of the subject,
The solar cell 18 connected to an analog meter (57 described later) built in the main body is, for example, of an amorphous silicon type, and generates an electromotive force according to the amount of received light. Drive the meter.

The light receiving surface of the solar cell 18 is arranged from the photographing lens 13 to the stroboscopic light emitting window 16 and from the center line of the stroboscopic light emitting window 16 (indicated by a dashed line in the drawing) to the photographing lens 13. This allows the film unit with lens 11
This prevents the finger holding the main body from blocking the light receiving surface of the solar cell 18. Also, by arranging this light receiving surface on the front of the film unit 11 with lens,
Since the light can be measured in the same direction as the direction in which the subject light enters the photographing lens 13, the quantity of the subject light is accurately measured.

A shutter button 21, a film counter window 22, and a charging completion display window 23 are provided on the upper surface of the film unit 11 with a lens.
And a finder eyepiece window (see reference numeral 26 in FIG. 3).

As shown in FIG. 3, the lens-fitted film unit 11 has a main body base 32 provided with an exposure unit 29 and a strobe device 31 at the center, and a front cover 33 which covers the front and rear thereof.
And a rear cover 34, a unit body, and a cartridge 36 and a photo film 37 drawn from the cartridge 36 and formed into a roll. It is preferable to use a photographic film 37 having an ISO sensitivity of 1000 or more. In this embodiment, the one having an ISO sensitivity of 1600 is used.

The cartridge 36 and the photographic film 37 are stored in a cartridge storage chamber 32a and a film storage chamber 32b formed in the main body 32, respectively.
At the time of manufacture. Below the rear cover 34, bottom lids 34a and 34b are formed integrally to cover the bottom openings of the cartridge storage chamber 32a and the film storage chamber 32b in a light-tight manner. The bottom cover 34a is opened when the cartridge 36 in which the photographed photo film 37 has been taken in is taken out.

The winding knob 24 is connected to the cartridge storage chamber 32
The hoisting shaft, which is attached to the upper part of a and is integrally formed on the lower surface thereof, engages with the spool of the cartridge 36. By rotating the winding knob 24 for each photographing, the photographed film 37 having been photographed is wound into the cartridge 36 one frame at a time. In conjunction with the winding of one frame of the film, the shutter mechanism incorporated in the exposure unit 29 is charged for the next photographing, and when the feeding of one frame of film is completed, the winding knob is operated by the lock lever incorporated in the exposure unit 29. The rotation of 24 is locked.

The strobe device 31 includes a main condenser 39,
A circuit board 43 on which circuit components such as a synchro switch 41, a strobe light emission control switch 42, and a step-up coil are mounted; a light emitting unit 46 including a strobe discharge tube and a reflector; The light emitting section 46 is exposed to the outside through the strobe light emitting window 16. A circuit pattern is printed on the circuit board 43, and various circuit elements are attached to the front of the plane circuit board 43 on which a strobe circuit is formed.
In addition to the strobe light emission control switch 42, the charging switch contact piece 44
And a support plate 48 for supporting the strobe switch 17 in front of the
Is attached.

The charging switch contact piece 44 is a main capacitor
Strobe switch to start charging to 39
17 slides turn on / off. The synchro switch 41 sends a trigger signal to the strobe circuit to emit strobe light, and operates in synchronization with the pressing of the shutter button 21. The flash emission control switch 42 is
This is for controlling on / off of strobe light emission according to the amount of light of the subject, and is switched in conjunction with the cam plate 51.

In front of the strobe light emission window 16, an electro-optic modulation element whose light transmittance changes according to the applied voltage and adjusts the amount of light emitted from the strobe device, in this embodiment a guest-host liquid crystal plate ( GH liquid crystal plate).
The GH liquid crystal plate has a transparent conductive film and an alignment film formed on a pair of transparent substrates, the alignment film surfaces are opposed to each other, and a gap is filled with a GH liquid crystal mixed with a nematic liquid crystal and a dichroic dye. When an AC voltage is applied between the pair of transparent conductive films as electrodes, the light transmittance changes depending on the level of the voltage. It is disclosed in, for example, JP-A-10-111513. In the present embodiment, a GH liquid crystal plate having a voltage-light transmittance characteristic as shown in Table 1 was used. This G
The light transmittance of the H liquid crystal plate 104 is high (about 70%) from the state where no voltage is applied to about 2 Vrms, and the light transmittance gradually decreases as the applied voltage is increased to about 5 Vr.
It saturates to the lowest light transmittance (about 10%) in ms.

The transparent conductive films 105a and 105b of the GH liquid crystal plate 35
As shown in FIG. 5, it is connected to a strobe circuit of a strobe device. This strobe circuit includes a power supply circuit 101 and a discharge circuit 102. A well-known blocking oscillator is used for the power supply circuit 101. The blocking oscillator includes a transistor 66 for oscillation control, an oscillation transformer, and a diode 45 for half-wave rectification.

The strobe light amount adjusting circuit 103 uses a CdS 107 as a light receiving element whose resistance changes according to the luminance of the object, and is connected in series with the GH liquid crystal plate 104.
Further, a variable resistor R1 for adjusting a voltage level applied to the transparent conductive films 105a and 105b of the GH liquid crystal
4 is connected in parallel. The illuminance Lv (subject brightness) and the resistance value of CdS 107 are almost inversely proportional. For example, when the subject brightness is low, the resistance value of CdS 107 increases. When the resistance value of CdS 107 increases, the voltage applied to the transparent conductive films 105a and 105b of the GH liquid crystal plate 104 decreases. The relationship between the resistance value of CdS 107 and the voltage applied to the transparent conductive films 105a and 105b can be adjusted by the variable resistor R1.

By appropriately selecting the resistance value of the variable resistor R1, a characteristic is realized in which a high light transmittance is maintained until the object brightness reaches a certain value, and the transmittance gradually decreases after a certain value. can do.

The exposure section 29 has a dark box base 52 protruding forward in the shape of a rectangular tube as a base, and a finder mechanism in addition to a shutter mechanism and a winding mechanism.
An exposure frame is formed on the back surface of the dark box base 52, and limits the exposure range for one frame on the front surface of the photographic film 37 sent to the photographing position.

As shown in FIG. 4, a shutter opening 52a is formed in the front surface of the dark box base 52, and in front of the shutter opening 52a,
A shutter blade 53, a pair of aperture plates 54 and 55, and a shutter cover 56 that covers these are attached. The shutter cover 56 has a built-in shooting lens 13 and a dark box base.
On the upper surface of 52, each diaphragm plate 54,
An analog meter 57 for adjusting the amount of movement of 55 is attached. The analog meter 57 is a well-known ammeter composed of a coil and a magnet.
The swing amount of a changes. The analog meter 57
8 connected to receive current supply. When the cam plate 51 is engaged with the needle 57a, the amount of movement is determined according to the amount of deflection of the needle 57a.

The shutter blade 53 is of a well-known kicking type, and includes a blade portion 53a and a mounting portion 53b extending above the blade portion 53a. The mounting portion 53b is engaged with a pin formed on the front surface of the dark box base 52, and the pin is used as a center axis to freely rotate between a closed position for closing the shutter opening 52a and an open position for opening the opening 52a. It is attached. Mounting part 53b and dark box base 5
A spring 58 is mounted between the shutter blade 5 and the shutter blade 5.
3 is urged by the spring 58 toward the closed position.

When the shutter button 21 is depressed, the kicking portion 21a extending below the shutter button 21 suppresses the release lever 59. When the release lever 59 is suppressed, the shutter charge is released, and the kick lever 60 is attached to the mounting portion 53b.
Kicks off his head. As a result, the blade 53a rotates,
The shutter opening 52a is opened and closed. In addition, in the mounting portion 53b,
The suppression unit 53c is provided. The suppression unit 53c is for emitting a strobe light in conjunction with opening and closing of the shutter. When the shutter blade 53 reaches the fully open position, the sync switch is set.
Press 41 to turn it on.

The diaphragm plates 54 and 55 have substantially semicircular cutouts formed below the diaphragm plates 54 and 55, and are provided so as to face each other. The aperture plates 54, 55 have holes 54a, 55a formed respectively.
Is engaged with a pin provided on the dark box base 52, and is rotatably mounted. By this rotation, the diaphragm plates 54 and 55 overlap each other, so that the notch forms a diaphragm opening, and the size of the diaphragm opening is adjusted according to the degree of overlap.

The aperture plates 54 and 55 are provided with long holes 54b and 55b, respectively. The aperture plates 54 and 55 are
When the operating pin 58 provided on the cam plate 51 is pushed through b and 55b, it is interlocked with the cam plate 51. Further, the restriction plate 54c is provided on the aperture plate 54. The restricting pin 54c is for restricting the rotation of the diaphragm plate 55, and prevents the diaphragm opening from being completely closed due to an error in engagement between the diaphragm plates 54 and 55.

The cam plate 51 is for rotating the aperture plates 54 and 55. The material is made of an elastic thin plastic or the like. The cam plate 51 is rotatably supported by engaging the hole 51a with a pin 61 provided on the main body base 32. On the upper surface of the cam plate 51, a cam surface 51b is formed in a stepwise manner. When the cam plate 51 rotates clockwise as viewed from the front, the cam surface 51b contacts the needle 57a. The cam surface 51b is formed in two steps, a high surface and a low surface, and the amount of movement of the cam plate 51 changes in two stages when the needle 57a comes into contact with any of these surfaces.

Above the needle 57a, a regulating surface 62 is provided integrally with the finder frame so as to face the cam surface 51b. The regulating surface 62 regulates the rotation of the cam plate 51 which rotates while pressing the cam surface 51b against the needle 57a. Further, the regulating surface 62 presses the needle 57a pressed against the cam surface 51b with the cam surface 51b.
By pinching together with b, the position of the needle 57a is fixed.

The cam surface 51b is formed lower on the left side when viewed from the front. Therefore, when the swing amount of the needle 47a is small, the rotation amount of the cam plate 51 is small, and when the swing amount of the needle 47a is large, the rotation amount of the cam plate 51 is large. Cam plate 51
The amount of movement of the operating pin 58 also changes in accordance with the change in the amount of rotation of. Thereby, the size of the aperture opening is adjusted according to the amount of light of the subject.

The rotation of the cam plate 51 is performed in conjunction with the shutter button 21. For this reason, an interlocking lever 63 is formed at one end of the cam plate 51 and extends toward the kicking portion 21a. The interlocking lever 63 is arranged so as to engage with the protrusion 21b provided on the kicking section 21a. When the shutter button 21 is depressed, the interlocking lever 63 is
Is pushed up, and the cam plate 51 rotates clockwise. As described above, the aperture plates 54 and 55 operate with the force of pressing the shutter button 21. Therefore, a power supply for operating the diaphragm plates 54 and 55 is not required.

In FIG. 5, which shows an example of a strobe circuit, in the strobe circuit, when the charging switch contact piece 44 is turned on, the oscillating transistor 66 conducts and the boost coil 67 operates. The main capacitor 39 and the trigger capacitor 68 are charged by the secondary current obtained from the boost coil 67, and when the main capacitor 39 reaches a specified charge level, the neon tube 69 is turned on. Synchro switch by opening shutter blade 53
When 41 is turned on, a current flows through the primary side of the trigger coil 71 due to the discharge of the trigger capacitor 68, and a high voltage is generated at the trigger electrode 72 connected to the secondary side. As a result, the electric charge stored in the main capacitor 39 is transferred to the strobe discharge tube 73.
Through the device and emit a strobe light.

The strobe light emission control switch 42 is provided on a current supply path from the trigger capacitor 68 to the trigger coil 71. When the strobe light emission control switch 42 is on, a current is supplied to the trigger coil 71 to emit strobe light. On the other hand, when the flash light emission control switch 42 is turned off, even if the synchro switch 41 is turned on, the current portion is not supplied to the trigger coil 71, so that the flash light emission is prohibited.

Hereinafter, the operation of the above configuration will be described with reference to FIG. First, as shown in FIG.
When the subject light amount is small, the amount of movement of the needle 57a is small, and the needle 57a is at a position facing the high surface of the cam surface 57b.
In this state, when the shutter button 21 is manually pushed,
21b pushes up the link lever 63. Thereby, the cam plate 5
1 rotates counterclockwise. When the cam plate 51 rotates, the operating pin 58 moves upward, and the diaphragm plates 54 and 55 rotate in a direction approaching each other to form a diaphragm opening.

The rotation of the cam plate 51 stops when the cam surface 51b contacts the needle 57a and presses the needle 57a against the regulating surface 62. Since the amount of rotation of the cam plate 51 is small, the aperture opening has a large diameter.

At this time, the needle 57a is sandwiched between the cam surface 51b and the regulating surface 62 and is fixed at that position. For this reason, the position of the hand 57a does not change even if the subject light amount changes until the shutter button 21 is fully pressed and the shutter operates. Therefore, the diameter of the aperture opening does not change during the shutter operation.

In this state, when the shutter button 21 is further depressed, the interlocking lever 63 is further suppressed by the projection 21b and elastically deforms, as shown by the two-dot chain line in FIG. This elastic deformation allows the shutter button 21 to be fully pressed. When the shutter button 21 is fully pressed, the release lever 59 is released by the suppression from the kicking section 21a, and the shutter blade 53 opens and closes.

When the shutter blade 53 opens and closes, the synchro switch 41 is turned on, and when the main capacitor 39 is charged, a strobe light is emitted. Shooting lens
The subject light incident from 13 passes through the aperture and forms an image on the photographic film 37. Since the aperture opening has a large diameter, an appropriate exposure amount can be obtained. Shutter button
When the user releases his / her hand, the kicking section 21a separates from the interlocking lever 63, and the cam plate 51 rotates counterclockwise by its own weight and returns to the initial position.

Next, when the amount of light of the subject is large, FIG.
As shown in (B), the needle 57a has a large deflection amount,
It comes to a position facing the lower surface of the cam surface 51b. In this state, when the shutter button 21 is manually pushed, the protrusion 21b pushes up the interlocking lever 63, and the cam plate 51 rotates until the cam surface 51b presses the needle 57a against the regulating surface 62. At this time, the cam plate 51
Is large, so the movement amount of the operating pin 58 also increases,
The amount of rotation of the diaphragm plates 54 and 55 also increases. For this reason, the aperture is adjusted so as to have a small diameter.

When the shutter button 21 is further pressed in this state, the interlocking lever 63 is elastically deformed as shown by a two-dot chain line in the figure, and the shutter button 21 can be fully pressed. When the shutter button 21 is fully pressed, the shutter blade 53
When the shutter opens and closes, the synchro switch 41 is turned on.The subject light incident from the photographing lens 13 passes through the aperture opening,
An image is formed on the photo film 37. Since the aperture is adjusted to a small diameter, an appropriate exposure can be obtained.

In the above example, a description has been given of an example in which a solar cell is used as the measuring means for controlling the exposure amount. However, a photoconductive element may be used instead of the solar cell. As the photoconductive element, for example, CdS or a photodiode is used.

In the above example, the cam plates have different heights.
In the above example, two cam surfaces are formed and the size of the aperture is adjusted in two steps.However, the number of steps is not limited to two. You may make it adjustable. Further, the cam surface may be formed not in a step shape but in a slope, and the size of the aperture may be adjusted steplessly.

Further, as an example of the diaphragm plate, an example is described in which two diaphragm plates are overlapped to form a diaphragm opening. In addition, for example, a diaphragm plate having a plurality of different diaphragm openings is used. The aperture value may be adjusted by moving the aperture plate.

The standard of the photographic film cartridge may be IX240 type or 135 type.

Table 2 shows the specifications of the film with lens 1.

Specifications of the film with lens 1

[Table 2]

The photographic film is disclosed in Japanese Patent Application No. 10-11119.
As described in No. 6, there was used one provided with a fourth photosensitive emulsion layer having sensitivity to light near 520 nm between a green photosensitive emulsion layer and a red photosensitive emulsion layer.

Table 3 shows the change of the luminance range and the strobe guide number which can be photographed by the film unit with the lens.

[0081]

[Table 3]

As can be seen from Table 3, the film with the lens of the present invention can be photographed in a wide exposure range from LV6 to LV16 when the strobe is not used or when the background does not reach the strobe light. Further, in flash photography, it is possible to photograph a main subject of 5 m even in darkness. When flash photography is performed with a background of LV6 or higher, a print of an appropriate main subject and a background density ratio can be obtained. The value of LV6 or more is almost satisfied in a normal lighting environment, and it can be seen that the film unit with a lens of the present invention can take a photograph of an appropriate density in any photographing environment.

When a flash is used during daytime shooting with an LV of 11 or more, a sufficient daylight synchronization effect can be obtained because the amount of strobe light is increased, and an appropriate main subject / background density ratio can be obtained even in backlight. This makes it possible to take a beautiful picture without any unpleasant contrast on the face or the like.

[0084]

By using the film unit with a lens of the present invention, all of the following items which could not be achieved by the conventional film unit with a lens can be realized.

The background is drawn on the print at an appropriate density under all the photographing conditions of LV6 to LV16. -Provide a photograph having an appropriate main subject / background density ratio, especially in a low luminance range such as indoors or at night. • Let the user choose whether to use a strobe.・ Provides beautiful pictures with an appropriate main subject / background density ratio even during stroboscopic photography outdoors during the day.

As described above, a satisfactory photograph can be provided in any photographing environment in response to the user's request.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an operation state of an aperture adjustment mechanism.

FIG. 2 is an overall perspective view of a lens-fitted film unit having a built-in aperture adjusting mechanism of FIG. 1;

FIG. 3 is an exploded perspective view of the lens-fitted film unit of FIG. 1;

FIG. 4 is an exploded perspective view showing a main part of an aperture adjustment mechanism.

FIG. 5 is a circuit diagram showing a strobe circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Film unit 1 with a lens 16 ... Strobe light emission window and GH liquid crystal plate 18 ... Solar cell 21 ... Shutter button 42 ... Strobe light emission control switch 51 ... Cam plate 54, 55 ... Aperture plate 57 ... Analog meter 57a ... Needle 101 ... Power supply Circuit 102 Discharge circuit 103 Strobe light amount adjustment circuit 106 Photometry window 104 GH liquid crystal plate 107 CdS R1 Variable resistor 108 Oscillation transformer

Claims (5)

[Claims] 1. A photometric unit that includes a photographing mechanism having a photographing lens, a shutter device, an aperture, and a strobe device, and outputs a light amount signal corresponding to a light amount of a subject in a lens-equipped film unit in which an unexposed photographic film is loaded in advance. A film unit with a lens, comprising: an adjusting mechanism for changing an exposure amount of the film in accordance with the light amount signal; and a means for adjusting a strobe light amount to the object in accordance with the object signal. . 2. A stabilizing device according to claim 1, wherein said strobe light amount adjusting means includes a dimming filter disposed on a front surface of said strobe light emitting section.
2. The film unit with a lens according to claim 1, further comprising: means for moving the filter. 3. A lens with a lens according to claim 1, wherein said means for adjusting the amount of strobe light includes an electro-optic modulation element whose light transmittance changes according to an applied voltage. Film unit. 4. The strobe light amount adjusting means adjusts the strobe light amount by weakening the strobe light amount when the subject light amount is small and increasing the strobe light amount when the subject light amount is large. The lens-equipped film unit according to claim 1. 5. The apparatus according to claim 1, wherein the shutter device has a fixed speed.
When the shutter speed of the shutter device is T seconds and the smallest guide number when the amount of light of the subject of the strobe device is small is G (ISO100 · m), 7.0 ≦ log ₂ (G ² ) + log ₂ The lens-equipped film unit according to claim 4, wherein the following relationship is satisfied: (1 / T) ≤12.5.