JPH05323416A - Shutter unit for film unit with lens - Google Patents

Abstract

PURPOSE:To use a film unit with a lens with a stroboscope and a film unit with a lens without the stroboscope in common. CONSTITUTION:A pawl part 19 and a pressing part 20 are integrally formed on a shutter blade 17. The shutter blade 17 is attached to be freely turnable to a shutter unit 15 by a shaft 18. On the other hand, a shutter driving lever 21 kicking the pawl part 19 at the time of releasing a shutter, and turning the shutter blade 17, is provided on the shutter unit 15. The shutter blade 17 and a shutter driving lever 21 are attached, so as to set a gap H between loci formed by the top end of the pawl part 19 and the bottom end of the shutter driving lever 21 within the range of 0.5mm-0.6mm, when the shutter blade 17 is in a released position shown by the figure. Thus, each exposing time of the film unit with the lens with the stroboscope and the film unit with the lens without the stroboscope can be made almost the same proper time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter unit of a film unit with a lens (hereinafter referred to as a film unit).

[0002]

2. Description of the Related Art The applicant has provided a film unit (trade name "Sharan"). This film unit comes with an international standard (ISO 1007-1979 edition) in the unit body with a simple shooting mechanism so that users can easily purchase and enjoy photography.
The 35 mm film specified in 1. is built in beforehand. In addition, as a variation, a strobe-equipped film unit (trade name "Sharp Run Flash") is also provided, in which a strobe device is attached to the unit body so that the photograph can be taken satisfactorily indoors or at night. In this strobe-equipped film unit, when the exposure opening is fully opened, the pair of synchro contact pieces are brought into contact with each other by the shutter blades so that the strobe light is emitted.

[0003]

The film unit and the strobe-equipped film unit are sent to a developing station after the photographing is finished, and separated into a unit main body and a photographed film. The unit main body is discarded, and the photographed film is developed. From the standpoint of resource saving and environmental protection, the shooting mechanism is unitized and reused without discarding the unit body, and the unit cost is used for both the film unit and the strobe-equipped film unit. Are being made cheaper.

By the way, in the shutter mechanism of the film unit, the shutter blades are rotated against the bias of the spring, whereas in the shutter mechanism of the film unit with a strobe, the bias of the spring and the synchronizing contact piece is resisted. Since the shutter blades had to be rotated, there was a difference in the exposure time between the film unit and the strobe-equipped film unit. For this reason, when the shutter mechanism is unitized as it is, there arises a problem that it cannot be commonly used for the film unit and the strobe-equipped film unit.

The present invention has been made in view of the above circumstances.
An object of the present invention is to provide a shutter unit for a film unit that can be used as both a film unit and a film unit with a strobe, and has an exposure time of approximately the same appropriate time.

[0006]

In order to achieve the above object, in the film unit shutter unit of the present invention, the relationship between the mounting positions of the shutter drive lever and the shutter blade is determined by the shutter blade side end portion of the shutter drive lever. The gap between the path drawn by and the claw portion of the shutter blade at the open position is set to 0.5 mm to 0.6 mm.

[0007]

FIG. 8 shows a strobe-equipped lens-equipped film unit (hereinafter simply referred to as strobe-equipped film unit) incorporating a shutter unit according to the present invention. This strobe-equipped film unit 2 has a photographing mechanism. It is composed of a unit main body 3 and a paper box 4 for storing the main body 3 which is printed for decoration. Since the photo filming is performed in the state that the unit main body 3 is housed in the paper box 4, the strobe-equipped film unit 2 has a taking lens 5, a viewfinder 6, a shutter button 7, a remaining shooting number display plate 8, and a winding knob 9. , And a hole for exposing the light emitting unit 10. Furthermore, the paper box 4 is formed with a notch so that the charging knob 11 for charging can be easily pressed. The unit main body 3 is composed of a main body portion, and a front cover and a rear cover which are fixed to the front and rear by the nails,
A film with a cartridge is stored inside.

FIG. 4 shows a shutter unit of the present invention. An exposure opening 16 is formed in the center of the shutter unit 15. This exposure opening 16 is usually a shutter blade 17 made of light-shielding plastic.
Is shielded by. The shutter blade 17 is rotatably attached to the shutter unit 15 via a shaft 18. The shutter blade 17 has a claw portion 19 and a pressing portion 20.
2, the pawl portion 19 is kicked by the shutter drive lever 21 at the time of shutter release to rotate the shutter blade 17 in the shielding position, and the pressing portion 20 is as shown in FIG. Then, the synchronizing contact piece 22 is pressed and deformed, and this is brought into contact with another synchronizing contact piece 23 to cause the light emitting section 10 to emit light.

The shutter blade 17 is biased counterclockwise by a spring 25 shown in FIG. 2 and abuts on a stopper 26 provided on the right side of the exposure opening 16 to stop at the shielding position. A pair of positioning pins 2 are provided above the stopper 26.
7a, 27b are planted and these pins 27a, 27b
Reference symbol b locks the contact unit holding the synchronizing contact pieces 22 and 23. Above the pins 27a and 27b, an opening 29 is formed for positioning when the shutter unit 15 is incorporated into the unit body 3. Further, a shutter cover 30 is attached to the front surface of the shutter unit 15 so that the shutter blades 17 do not drop out. The shutter cover 30 is provided with a holding portion 31 for holding the taking lens 5, and a small aperture opening 32 is formed in the center of the holding portion 31 to increase the depth of focus.

At the top of the shutter unit 15, there is a shaft 3
5, 36 and a bearing 37 are formed. The remaining photographing number display plate 8, the shutter driving lever 39 and the shutter driving cam 39 having the cam arm 38 are fitted to the shaft 35, and the locking lever 40 is fitted to the shaft 36. In this state, the shutter drive cam 39 and the locking lever 40 are connected to the spring 4
1 is urged counterclockwise and clockwise, respectively, and engages via the cam arm 38.

When the shutter button 7 is pressed and the locking lever 40 is rotated counterclockwise, the shutter drive lever 21 is rotated counterclockwise by the spring 41. During this rotation, the shutter drive lever 21 kicks off the claw portion 19,
The shutter blade 17 is rotated toward the open position. At this time, since the distance from the shaft 18 is different when the shutter drive lever 21 kicks off the upper end of the claw portion 19 and when the lower end of the claw portion 19 kicks off, the initial speed when the shutter blade 17 rotates is the same. Differently, the exposure time changes. Therefore, in this embodiment, when the shutter blade 17 is rotated to the position shown in FIG. 1, the gap H between the upper end of the claw portion 19 and the locus drawn by the lower end of the shutter drive lever 21 is, for example, 0.5 mm.
The positional relationship between the shutter drive lever 21 and the claw portion 19 is set so as to be 0.6 mm to obtain an appropriate exposure time.

A shaft of a cam 42 which engages with a locking lever 40 shown in FIG. 2 is inserted through the bearing 37. A driven sprocket 43 that rotates counterclockwise when the film is wound is engaged with this shaft. When the film is wound up, the cam 42 is rotated counterclockwise by the driven sprocket 43, and the shutter drive cam 39 is rotated clockwise through the cam arm 38. As a result, the shutter drive lever 21 is returned to the charge position, and the remaining number-of-images display plate 8 is rotated by one scale.

FIG. 5 is an exploded view of the main body. An exposure chamber 51 is formed in the center of the main body 50. On both sides of the exposure chamber 51, a cartridge chamber 52 and a film chamber 53 are provided. Further, hooks 54 to 56 and a pin 57 fitted into the opening 29 are formed on the front surface of the main body 50. The hooks 54 and 55 hold the strobe unit 58, and the hook 56 and the pin 57 hold the shutter unit 15. Strobe unit 5
Reference numeral 8 includes a light emitting portion 10, a printed circuit board 61 to which electric parts such as a capacitor 60 are soldered, a charging switch 62, and a contact unit 63 holding a pair of synchro contact pieces 22 and 23.

In the strobe-equipped film unit 2 thus constructed, the charging knob 11 is pushed to charge the condenser 60 during photographing. After that, when the shutter button 7 is pressed, the locking lever 40 is rotated counterclockwise in FIG. 4, and the locking of the shutter drive cam 39 is released. As a result, the shutter drive lever 21 is moved by the spring 41 from the charge position to the position shown in FIG.
9 is kicked off and the shutter blade 17 is rotated clockwise against the bias of the spring 25. During this rotation, the pressing portion 2
0 presses the synchro contact piece 22 downward to deform it. As shown in FIG. 3, when the shutter blade 17 is rotated to a position where the exposure opening 16 is completely opened, the synchro contact piece 22 is further pressed downward and comes into contact with the synchro contact piece 23.

When the synchronizing contacts 22 and 23 come into contact with each other, electric power is supplied from the capacitor 60 to the light emitting section 10 to emit strobe light. After that, the shutter blades 17 rotate due to inertia to the open position shown in FIG. At this time, the shutter drive lever 21 has passed over the claw portion 19, and the shutter blade 17 has the spring 25 and the synchronizing contact piece 2.
It is urged by 2, 23 and rotated counterclockwise. Then, the shutter blade 17 comes into contact with the stopper 26 and is stopped at the blocking position, and the photographing ends. The shutter drive lever 21 is stopped from moving because the cam arm 38 contacts the cam 42.

After shooting, the winding knob 9 is rotated,
When the film is wound up, the driven sprocket 43 is rotated counterclockwise. As a result, the cam 42 moves the spring 4
The shutter drive cam 39 is rotated counterclockwise against the urging force of 1 to rotate the shutter drive cam 39 clockwise. By this rotation, the shutter drive lever 21 returns to the charge position, and the preparation for the next shooting is completed. The shutter drive lever 21 comes into contact with the claw portion 19 during the return, but is deformed upward and gets over this. Although the shutter drive lever 21 presses the pawl portion 19 when it goes over the pawl portion 19, the shutter blade 17 is prevented from rotating counterclockwise by the stopper 26, so that the exposure opening 16 is not opened.

FIG. 6 shows the result of measuring the exposure time by actually incorporating the shutter unit into seven film units with strobes 2 and changing the above-mentioned gap H from 0.3 mm to 0.8 mm. It is a thing. Further, in FIG. 7, the strobe unit 58 is removed from the main body 50 so that the shutter blade 17 in the middle of rotation does not come into contact with the synchronizing contact piece 22, the shutter unit 15 is incorporated, and the gap H is 0.3 mm to 0. The results of measuring the exposure time by changing the distance between 8 mm are shown.

From these results, the exposure time of the film unit with strobe 2 and the film unit without strobe has the smallest difference when the gap is 0.3 mm, and the exposure time is 0.5.
It was found that there was little difference between mm and 0.6 mm.
It was also found that there was too much difference in exposure time when the gap was 0.7 mm or more. By the way, in the case of the film unit 2 with a strobe and the film unit without a strobe, the shutter speed is 1/1 due to the relationship with the aperture 32.
It is desirable to make it slower than 25 mS. Therefore, the shutter unit 15 of the present invention can be commonly used for the strobe-equipped film unit 2 and the strobe-free film unit, and both can obtain an appropriate exposure time.

[0019]

As described above, in the shutter unit for the lens-fitted film unit of the present invention, the relationship between the mounting positions of the shutter drive lever and the shutter blades is represented by the locus drawn by the shutter blade side end portion of the shutter drive lever. ,
0.5mm gap between the shutter blades in the open position and the claws
Since it is set to about 0.6 mm, it can be used for each of the lens-fitted film unit and the strobe-equipped lens-fitted film unit, and any exposure time can be made to be almost the same appropriate time.

[Brief description of drawings]

FIG. 1 is a diagram showing a positional relationship between a claw portion of a shutter blade in an open position and a shutter drive lever.

FIG. 2 is a diagram showing positions of shutter blades when a shutter drive lever kicks a claw portion away.

FIG. 3 is a diagram showing positions of shutter blades when a synchronizing contact piece comes into contact with each other.

FIG. 4 is an exploded perspective view of a shutter unit.

FIG. 5 is an exploded perspective view showing a main body portion.

FIG. 6 is a diagram showing a measurement result of an exposure time of a film unit with a strobe.

FIG. 7 is a diagram showing a measurement result of an exposure time of a film unit without a strobe.

FIG. 8 is a perspective view showing an appearance of a strobe-equipped film unit.

[Explanation of symbols]

 2 Film unit with strobe 3 Unit body 15 Shutter unit 16 Exposure opening 17 Shutter blade 19 Claw 21 Shutter drive lever 32 Aperture opening

Claims (1)

[Claims] 1. A lens with a shutter drive lever that is driven by the biasing force of a spring during shutter release, and a shutter blade that has its pawl kicked by the shutter drive lever and that is rotated from a blocking position to an opening position. In the film unit shutter unit, the gap between the claw portion of the shutter blade rotated to the open position and the locus drawn by the claw portion side end portion of the shutter drive lever is set to 0.
A shutter unit for a film unit with a lens, which is characterized in that the length is set to 5 mm to 0.6 mm.