JP2001013639A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To naturally imprint even a background indoors or at night and to enable any person to perform daylight synchro photographing without failing. SOLUTION: When a photographing mode switching knob 10 is set to an index 'outdoors', a small diaphragm aperture 35a is inserted in a photographing optical path and the value of a photographing diaphragm becomes F13. A stroboscope charging button 9 is optionally pressed in this outdoors photographing mode. By pressing the button 9, a switch armature 40 is pressed by the button 9 and elastically deformed, so that the edge part of the armature 40 makes a pair of print pattern contacts 41 short-circuit to start the charging a stroboscopic circuit. When the knob 10 is set to an index 'indoors', a diaphragm switching plate 35 is retreated from the photographing optical path and the photographic diaphragm of a photographing lens 5 becomes an open aperture F5.6. Simultaneously, the end 35b of the plate 35 is inserted between the button 9 and the armature 40, and the armature 40 is pressed by the end 35b of the plate 35 and elastically deformed, so that the contact 41 is kept in a short- circuited state and a stroboscopic unit 23 is made to always emit light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-equipped film unit which enables daylight synchronized photography with a small aperture and constantly emits a flash with a large aperture or an open aperture.

[0002]

2. Description of the Related Art In order to make it easy for anyone to enjoy photography, a built-in unexposed photographic film is built in at the time of manufacture, eliminating the need for the user to load and rewind the film, and then submitting it to a processing agency when the shooting is completed. For example, a film unit with a lens that can receive a developed photographic film (negative) and a printed photograph has become widespread.

[0003] As such a film unit with a lens, a film unit with a built-in strobe device for photographing at night or indoors is commercially available. There is known a film unit with a built-in strobe which changes the aperture diameter of a photographing lens in conjunction with a charge switch for starting charging of a strobe device (for example, Japanese Patent Application Laid-Open No. 9-15693). Gazette).

In the film unit with a lens described in this publication, when shooting with a flash, the f-number is reduced (the diameter of the aperture opening is increased) so that the background can be naturally photographed indoors or at night, such as in the background. This makes it easier to take pictures in places.

[0005]

Recently, the number of users who use flash photography even on bright days has increased.
This daytime synchro photography is particularly effective when the subject is backlit, and the subject is brightened without being crushed.

However, in the film unit with a lens described in the above publication, when performing daylight synchro photography, the aperture becomes large even in a bright daytime, so that the exposure amount becomes excessive. The overexposed negative is
The printing time in the lab becomes longer, the cost burden of the lab increases, and the print quality deteriorates.

The present invention has been made in consideration of the above-mentioned problems, and can naturally photograph the background indoors or at night, and can perform daytime synchro photography with proper exposure without failure. It is an object to provide a film unit with a lens.

[0008]

In order to achieve the above object, a film unit with a lens according to the present invention comprises a photographing lens, a shutter mechanism, and a strobe device which emits strobe light in conjunction with the shutter mechanism. In a film unit with a lens for loading an unexposed photographic film into a unit body provided at the time of manufacture, a charge switch that is turned on to start charging the strobe device at least, and a small aperture opening of an aperture smaller than at least the open aperture are provided. An aperture switching member which is moved between a small aperture position for inserting the small aperture opening into the imaging optical path and an open aperture position for retracting the small aperture opening from the imaging optical path and keeping the charging switch on; It is provided with.

[0009] Further, an operation unit which is externally operated to move the aperture switching member between the small aperture position and the open aperture position is provided above the charging switch when the aperture switching member is in the small aperture position. , And is also used as a strobe charge button for turning on a charge switch by pressing.

[0010] A film unit with a lens for loading an unexposed photographic film at the time of manufacture into a unit body including a photographing lens, a shutter mechanism, and a strobe device that emits strobe light in conjunction with the shutter mechanism. A charging switch that is turned on at least to start charging the strobe device, and a large aperture position having two large and small aperture openings, wherein the large aperture opening is inserted into a photographing optical path and the charging switch is kept on. And an aperture switching member that is moved between a small aperture position where the small aperture opening is inserted into the photographing optical path.

[0011]

FIG. 2 shows a film unit with a lens 2 in which an exterior label 4 is attached to the center of the outer wall of a unit body 3 having a built-in photographing mechanism and the like. The outer label 4 includes a hood 6 of a photographing lens 5, a finder 7
Each opening for exposing the eyepiece 7a, the counter display plate 8 and the like is provided. Further, on the front surface of the unit main body 3, in addition to the photographing lens 5 and the eyepiece 7a, a strobe charging button 9, a photographing mode switching knob 10, and a strobe light emitting section 11 are provided.

The photographing mode switching knob 10 is moved right and left along the elongated hole 12 and click-stopped at the left and right ends, respectively. On the four exterior labels corresponding to each click stop position, an index “outdoor” indicating that the mode is an outdoor shooting mode suitable for outdoor shooting in fine weather to light cloudy day, and indoor shooting suitable for indoor or nighttime shooting. Each character of the index “indoor” indicating the mode is printed. When the photographing mode switching knob 10 is set to "outdoor", the photographing aperture is set to, for example, F13, and when set to "indoor", the open diaphragm is set to, for example, F5.6.

A grip 14 is provided at a portion of the unit body 3 which is gripped by the right hand, and a shutter button 15 is provided above the grip 14. On the upper rear side of the grip 14, a hoisting knob 1 that is rotated by the right thumb is provided.
6 are provided.

In FIG. 3, the unit main body 3 comprises a main body base 21, an exposure unit 22, a strobe device 23, a rear cover 24 and a front cover 25, and these are assembled by nail engagement.

A cartridge storage chamber 21a and a film storage chamber 21b are formed on the left and right sides of the main body base 21, respectively.
And a film roll 29a in the form of a roll is drawn out and stored in advance at the time of manufacture. In the film unit 2 with a lens, the shutter speed is fixed at, for example, 1/60 second and focus adjustment is not required. Since the depth can be increased, a high-sensitivity film of, for example, ISO800 is used.

The exposure unit 22 is assembled with a shutter mechanism including shutter blades 31, a shutter charging mechanism, a winding stop mechanism, a counter display plate 8, and the like based on the dark box section 22a.
a and the eyepiece 7b. Then, a lens holding member 33 holding the taking lens 5 is attached to the front surface of the dark box 22a where the shutter blade 31 is rotated.

Between the shutter blade 31 and the lens holding member 33, a strip-shaped aperture switching plate 35 in which the photographing mode switching knob 10 is implanted is provided movably in the left-right direction. Near the one end of the aperture switching plate 35, a circular small aperture opening 35a is formed which is inserted into and removed from the imaging optical path of the optical axis L with the movement of the aperture switching plate 35. The other end 35b is tapered so as to become thinner as it goes forward.

The flash unit 23 is provided with a synchro switch 37 for transmitting a trigger signal in conjunction with a shutter mechanism.
, A circuit board 38 provided with
And a battery 39 for supplying power to the strobe circuit.

The charging of the strobe unit 23 is performed by the switch contact piece 4 attached to the outer peripheral portion of the film storage chamber 21b.
0 is elastically deformed by pressing the strobe charging button 9, comes into contact with the pair of printed pattern contacts 41 of the circuit board 38, and starts when the printed pattern contacts 41 are short-circuited.

As shown in FIG. 1A, when the photographing mode switching knob 10 is set to the index "outdoor", the small aperture 35a is inserted into the photographing optical path, and the photographing aperture is set to, for example, F1.
It becomes 3. If you press the strobe charge button 9 in this state,
The switch contact piece 40 is pressed by the flash charging button 9 to be elastically deformed, and the tip of the switch contact piece 40 short-circuits the pair of printed pattern contacts 41 to start charging the flash circuit. This strobe circuit has a printed pattern contact 4
Once 1 is short-circuited, even if the short-circuit state is subsequently released,
The charging is stopped after the main capacitor 43 has been charged to the specified charging voltage (for example, disclosed in Japanese Patent Application Laid-Open No. 7-122389).

As shown in FIG. 2B, when the photographing mode switching knob 10 is set to the index "indoor", the aperture switching plate 35
Is retracted from the photographing optical path, and the photographing aperture of the photographing lens 5 becomes an open aperture, for example, F5.6. At the same time, the end 35b of the aperture switching plate 35 is inserted between the strobe charging button 9 and the switch contact 40, and the switch contact 40 is pushed by the end 35b of the aperture switching plate 35 to be elastically deformed, and the print pattern is changed. The contact 41 remains short-circuited, and the strobe unit 23 emits light at all times.

In order to take a picture with the film unit 2 with the lens constructed as described above, first, the winding knob 16 is used.
To rotate one frame of the photo film 29,
The first frame of the photo film 29 is set on the exposure frame. At the same time as the winding, a shutter charge is performed, and a winding lock mechanism operates to lock the rotation of the winding knob 16.

Next, a photographing mode is selected according to the brightness of the subject. When shooting in an environment in which the amount of light of the subject is sufficiently ensured, such as outdoor shooting during the day, the outdoor shooting mode is selected. The photographer confirms that the photographing mode switching knob 10 is located at the index “outdoor”. At this time, the diaphragm switching plate 35 is inserted into the photographing optical path, and the small diaphragm opening 35a is set behind the photographing lens 5.

After framing with the finder 7,
The shutter button 15 is pressed down. At the next moment, the shutter blade 31 opens and closes, and the subject light passes through the photographing lens 5 and the small aperture opening 35a, and the photographic film 2 set on the exposure frame.
9 is formed. In this outdoor shooting mode, the small aperture 3
Since the photographing is performed with the light beam at the center of the photographing lens 5 by 5a, an image having high sharpness can be obtained with less influence of aberration. In addition, since the depth of field is deep, shooting can be enjoyed without being conscious of the subject distance.

When the subject is backlit in the daytime outdoors, the strobe charging button 9 is depressed with the shooting mode switching knob 10 set to the index "outdoor".
Perform daylight synchro photography. Thus, the shooting aperture is F1
With the value of 3, the charging operation of the strobe circuit is started. Even after the pressing operation of the flash charging button 9 is stopped by the flash circuit, the charging operation is continued until the charging voltage of the main capacitor 43 reaches the specified charging voltage.

After confirming that the flash unit 23 has been fully charged in the charging completion display window, the photographer sets the shutter button 15
Press down. Synchro switch 3 by opening and closing shutter
7 is operated, and the strobe light is emitted from the strobe light emitting unit 11 toward the subject. Thus, the subject can be photographed brightly even in backlight shooting in which the subject becomes dark against a bright background. In the outdoor photographing mode, once the strobe light is emitted, the charging of the main capacitor 43 is not automatically started. Therefore, the strobe charge button is pressed each time.

When photographing indoors or at night, the indoor photographing mode is selected. The photographer sets the photographing mode switching knob 1
Move 0 to match the index “indoor”. As a result, the aperture switching plate 35 is retracted from the imaging optical path, and the aperture becomes F5.6 which is open. Further, since the end 35b of the aperture switching plate 35 is inserted between the flash charging button 9 and the switch contact 40, the switch contact 40 is elastically deformed and the printed pattern contact 41 is short-circuited, and the charging of the strobe unit 23 is performed. The operation will continue.

After confirming that the flash unit 23 has been fully charged, the photographer performs framing and performs shutter release.
Press to shoot. Since the shooting aperture is relatively bright at F5.6, for example, indoor illumination light is also effective, and the background is reflected without underexposure, and a more natural photograph can be taken. Immediately after the flash emission is performed simultaneously with the opening and closing of the shutter, the charging operation is started. In this indoor photographing mode, the charging operation of the strobe unit 23 is continuously performed. To stop the charging operation of the strobe unit 23, the photographing mode switching knob 10 is moved to return to the index “outdoor”.

After the shooting of all frames is completed in this way,
If the film unit with lens 2 is submitted to a developing dealer as it is, the photographic film 29 is developed and then printed. In this printing process, since the negative density at the time of backlight photography is also within an appropriate level, the printing can be performed in almost the same printing time as the normal printing time, and the burden on the laboratory does not increase. Then, the printed print photograph and the developed negative are returned to the user.

Next, another embodiment will be described. 4 and 5, a photographing mode switching knob 5 of an aperture switching plate 50 is shown.
Reference numeral 1 also functions as the flash charging button of the above embodiment. At one end of the aperture switching plate 50, a semi-lunar large aperture aperture 50a and a circular small aperture aperture 50b are formed in parallel. The aperture switching plate 50 is provided with a shooting mode switching knob 5.
1 is slid along the long hole 52a formed in the front cover 52, so that the large aperture 50
The small aperture stop 50b is moved between the open aperture position where the “a” is inserted and the small aperture position where the small aperture 50b is inserted. The large aperture 50a has a diameter larger than the open aperture of the taking lens 5, and the small aperture 50b has the same diameter as the small aperture 35a in the above embodiment.

When the aperture switching plate 50 is at the small aperture position, the photographing mode switching knob 51 is located above the switch contact 40. When the photographing mode switching knob 51 is pressed, the diaphragm switching plate 50 is elastically deformed and the switch contact piece 40 is pressed.
To the circuit board 38 side, and the printed pattern terminal 41 is short-circuited. When the pressing operation of the photographing mode switching knob 51 is stopped, the elasticity of the switch contact piece 40 and the aperture switching plate 5 are stopped.
Due to the elasticity of 0, the switch contact piece 40 and the photographing mode switching knob 51 return to their original positions, and the short circuit of the print pattern terminal 41 is released.

When the aperture switching plate 50 is in the open aperture position, the photographing mode switching knob 51 is retracted from above the switch contact piece 40, and at the same time, the switch 53 is connected by the projection 53 formed on the lower surface of the aperture switching plate 50. The piece 40 is pushed toward the circuit board 38, and the printed pattern terminal 41 remains short-circuited by the tip of the switch contact piece 40.

In FIG. 6 showing another diaphragm switching plate, a diaphragm switching plate 55 is formed by slightly increasing the length of the diaphragm switching plate 50 so as to replace the semi-lunar large diaphragm opening 50a with a circular large diaphragm opening 50a. An aperture 55a is provided. By providing the large aperture 55a, the shooting aperture in the indoor shooting mode can be set to a different aperture from the open aperture of the shooting lens 5, thereby increasing the degree of freedom in design. For example, if the diameter of the large aperture 55a is larger than the open aperture of the taking lens 5, the aperture becomes substantially the same as the open aperture of the taking lens 5. Although the background of the subject (a range where the strobe light does not reach) is slightly darkened, an image with a deeper depth of field and higher sharpness can be taken. The small aperture 55b is the same as the small apertures 35a and 50b.

In the embodiment described above, the open aperture of the photographing lens is set to F5.6, and the F value of the small aperture (hereinafter, the small aperture).
Is F13, the shutter speed is 1/60 second, and the film sensitivity is ISO800. However, the present invention is not limited to this. For example, the open aperture is F5.6 to F8, and the small aperture is F13.
~ F27, shutter speed 1/60 sec ~ 1/120
Seconds and film sensitivity can be arbitrarily selected in each range of ISO800 to ISO3200.

Further, in the above-described embodiment, the strobe unit is used in which the charging switch is turned on once, and then charged to the specified charging voltage even if the charging switch is turned off thereafter. However, the charging operation is performed only while the strobe charging button is pressed. A strobe unit to be used may be used.

Although the flash charging button is of a pressing type, it may be of a sliding type. In this case, with the shooting aperture set to the open aperture, stop the strobe charge button from moving the charge switch in the direction in which the charge switch is turned off by the aperture switch plate, or set the charge switch regardless of the position of the flash charge button. Turn on.

In a state where the photographic aperture is set to a small aperture,
After performing flash photography, the charging switch will not turn on unless the flash charging button is pressed again.
Although the main condenser is not charged, the charge switch may be kept on until the strobe charge button is returned to the off position using, for example, a slide-type strobe charge button.

Although both the large and small aperture openings are circular, the present invention is not limited to this. For example, a rectangular shape corresponding to the size of a photographing screen may be used.

[0039]

As described above, according to the present invention,
When the aperture switch is inserted into and removed from the imaging optical path to change the imaging aperture, and a small aperture opening is inserted into the imaging optical path,
When the charge switch can be turned on arbitrarily and the small aperture opening is retracted from the shooting optical path, the charge switch is kept on and continuous charging is performed. Synchro shooting is possible, even for beginners, it is possible to perform daytime synchro shooting with proper exposure,
In addition, the flash device is always in an open state indoors and at night, and the strobe device is always in a light emitting state, so that not only the subject but also the background can be brightly photographed, and a more natural photograph can be taken.

Further, since the operation section of the aperture switching member is also used as a strobe charging button, the number of parts is reduced, the structure around the charging switch is simplified, and the above effects can be achieved at lower cost.

Further, when the small aperture opening is retracted from the imaging optical path, if the large aperture opening is inserted into the imaging optical path, the degree of design freedom can be increased by changing the size of the large aperture opening. it can. For example, by making the large aperture opening smaller than the open aperture of the taking lens, the depth of field becomes deeper than in the case of the open aperture, and the image quality is further improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a relationship between a photographing lens, an aperture switching plate, a strobe charging button, a switch contact, and the like at a small aperture position (A) and an open aperture position (B).

FIG. 2 is an external perspective view of a film unit with a lens.

FIG. 3 is an exploded perspective view of a unit main body.

FIG. 4 is an explanatory diagram showing an embodiment in which a photographing mode switching knob and a flash charging button are also used.

5 is a plan view showing the diaphragm switching plate of the embodiment shown in FIG. 4 from above.

FIG. 6 is a plan view showing a diaphragm switching plate provided with two large and small diaphragm apertures.

[Explanation of symbols]

 2 Film unit with lens 5 Shooting lens 9 Strobe charge button 10, 51 Shooting mode switching knob 22 Exposure unit 23 Strobe unit 35, 50, 55 Aperture switching plate 35a, 50b, 55b Small aperture aperture 40 Switch piece 41 Print pattern contact 50a , 55a Large aperture aperture

Claims (3)

[Claims] 1. A lens-equipped film unit for mounting an unexposed photographic film at the time of manufacture to a unit body including a photographing lens, a shutter mechanism, and a strobe device that emits strobe light in conjunction with the shutter mechanism. A charging switch that is turned on at least to start charging the strobe device, and a small aperture position having at least a small aperture smaller than the open aperture, and a small aperture position and a small aperture opening where the small aperture opening is inserted into a photographing optical path. A film switching unit that is retracted from the optical path and is moved between an open diaphragm position for keeping the charge switch on. 2. An operation unit externally operated to move the aperture switching member between a small aperture position and an open aperture position, the operation unit being located above the charging switch when the aperture switching member is in the small aperture position. 2. The film unit with a lens according to claim 1, wherein the flash unit is also used as a strobe charge button for turning on a charge switch when pressed. 3. A lens-equipped film unit for mounting an unexposed photographic film at the time of manufacture to a unit body including a photographing lens, a shutter mechanism, and a strobe device that emits strobe light in conjunction with the shutter mechanism. A charging switch that is turned on at least to start charging the strobe device; and a large aperture position having two large and small aperture openings, wherein the large aperture opening is inserted into a photographing optical path and the charging switch is kept on. And a diaphragm switching member that is moved between a small aperture position for inserting the small aperture opening into the photographing optical path.