JPH10293344A - Film unit having lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit having a lens capable of shortening charging time, built-in with a small and inexpensive stroboscope device. SOLUTION: A stroboscope device is composed of a circuit board 44 on which a stroboscope circuit is arranged, stroboscope light emitting parts 11a to 11b installed on this circuit board 44 and an exclusive dry battery 52 being a power source of this stroboscope device. In the exclusive dry battery 52, for example, a length is set to 50.5 mm in the same as mono 3 type dry batteries R6 and L6, and a diameter is set to 10.5 mm in the same as mono 4 type dry batteries R03 and LR03. This exclusive dry battery 52 is formed by laminating plural unit cells inside, and voltage between both electrodes is higher than 1.5 volt, and is set to, for example, about 3 volt.

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, and more particularly, to an improvement of a film unit with a lens having a built-in flash device.

[0002]

2. Description of the Related Art Some film units with a lens which are provided with a simple photographing mechanism and are loaded with an unexposed photographic film and a patrone in advance have a strobe function. Such a film unit with a lens includes a photographing mechanism such as a photographing lens and a shutter mechanism,
The electronic device includes a strobe device, a photographing mechanism and a strobe device, and a main body base on which a photographic film and a patrone are loaded, and a front cover and a rear cover that cover the front and back surfaces of the main body base.

Such a conventional strobe device includes a strobe light emitting section including a strobe discharge tube, a circuit board on which a strobe circuit for emitting the strobe light is formed, and a dry battery having a voltage of 1.5 volts as a power supply. It is composed of Then, by pressing a charge operation button provided on the front surface of the film unit with the lens, the voltage of the 1.5 volt dry battery is boosted to about 300 V and applied to the main capacitor for charging. Then, when a trigger is generated at the time of shutter release, the discharge tube emits light with the electric charge charged in the main capacitor.

As one of the performances required for the above-described strobe device for a film unit with a lens, it is required that the amount of emitted light be sufficient to obtain a proper exposure for a subject within 4 m. . This is an essential condition for proper exposure of a subject in ordinary short-range flash photography.

In order to achieve the above conditions, in a high-sensitivity type lens-fitted film unit using a photographic film having a sensitivity of ISO 800, the capacity of the main condenser of the strobe device needs to be 100 μF. Using a photographic film having a sensitivity of ISO 400,
In a normal type film unit with a lens,
In order to obtain an appropriate exposure light amount, it is necessary to use a main capacitor having a capacitance of 160 μF or more.

Due to the difference in the capacitance of the main capacitor due to the difference in the photo film sensitivity, a normal type film unit with a lens using a low-sensitivity photo film can be connected to the main capacitor in flash photography. There is a problem that the charging time is longer than that of the high sensitivity type film unit with lens.

In order to prevent the charging time of the main capacitor from being lengthened, a conventional strobe device of a film unit with a lens uses a transformer having a large number of turns or an hFE.
High-speed charging is performed using a high-value transistor. Then, in order to protect the strobe discharge tube, charging is stopped at an appropriate charging level by a voltage limiting circuit (auto-cut circuit) composed of a Zener diode or the like, and the charging voltage is limited. In addition, the power supply used to charge the main capacitor is suitable for any type of film unit with lens, considering cost and size.
AA alkaline batteries (LR6) are used.

[0008]

However, a transformer having a large number of turns, a transistor having a high hFE value, a Zener diode used for an auto-cut circuit, and the like used for quick charging as described above are all cost-effective. One of the major features of the component is that it is expensive, and it is expensive.

AA alkaline batteries, which are used as a power source for a conventional flash unit of a film unit with a lens, have an excessively large power supply capacity, so that 70 to 90% of the entire size is required even after the photographing is completed up to the final photographing frame. At present, the above electromotive force remains. It is very wasteful to use such a dry battery having a capacity larger than necessary as a power source, and it is not preferable in terms of cost.

Further, the conventional AA alkaline battery has a voltage of 1.5 volts, which is low as a power source for a strobe device, and is an obstacle to quick charging with inexpensive components.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a film unit with a lens which shortens a charging time and has a built-in small-sized and low-cost strobe device.

[0012]

In order to solve the above-mentioned problems, in the film unit with the lens according to the first aspect, the power supply of the strobe device is changed to a cylindrical type having a voltage higher than 1.5 volts. It is a dry battery of a book. In claim 2, the dry battery is composed of several stacked unit cells.

According to a third aspect of the present invention, the dry battery is provided on the back side of the strobe discharge tube in parallel with the length direction of the strobe discharge tube, and the main capacitor of the strobe device is provided below the dry battery. is there. According to a fourth aspect of the present invention, the strobe device is provided with a discharge circuit for discharging all the electric power remaining in the dry battery after the completion of photographing of all the frames of the photographic film.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a film unit with a lens according to the present invention will be described below with reference to the accompanying drawings. FIG. 2 shows Advanced Ph
1 shows an external view of a film unit 2 with a lens corresponding to an auto System (APS). The film unit 2 with a lens is a unit main body 3 in which a film cartridge is loaded in advance and various photographing mechanisms are incorporated.
And an exterior paper 4 partially covering the unit main body 3.

A shutter button 6 and a counter window 7 are provided on the upper surface of the unit body 3, and a finder 8, a photographing lens 9, a flash charging operation button 10, and a flash light emitting unit 1 are provided on the front.
1 and the like are provided. Also, a winding knob 12 that is rotated from one frame to another is exposed from the rear side. The exterior paper 4 has an adhesive applied to the back surface and is adhered so as to be wound around the central portion of the unit main body 3, and has an opening for exposing the photographing lens 9, the finder 8, the counter window 7, and the like to the outside.

As shown in FIG. 3, the unit main body 3 includes a main body base 16 into which the film cartridge 14 is loaded,
An exposure unit 17 and a strobe device 18 are attached to the front surface of the main body 16, and a front cover 19 and a rear cover 20 are attached to cover the front and back sides of the main body 16. Assembled by engagement.

The film cartridge 14 comprises a plastic cartridge body 22 and a photographic film 23 housed in the cartridge body 22. A photo film 23 is provided in the cartridge body 22.
A spool 25 to which one end is locked is rotatably incorporated. Further, a film delivery mechanism as disclosed in Japanese Patent Application Laid-Open No. 6-266053 is incorporated. AP
The S-compatible photographic film 23 has two types of large and small perforations 28 and 29 of different sizes along one side edge, which set the leading side and the rear side in the film feeding direction of each frame 30. Are alternately arranged at intervals of.

A light-shielding tube 34 is provided at the center of the main body base 16. On both sides of the light-shielding cylinder 34, a cartridge chamber 36 and a film roll chamber 37, in which the cartridge body 22 and the photographic film 23 are rolled at the manufacturing stage, are housed, respectively. Is formed.

The cartridge chamber 36 and the film roll chamber 37 have a rear cover 20 attached to the rear side of the main body base 16 and a bottom lid 39 for the cartridge chamber formed integrally with the rear cover 20 and a film roll chamber 37 for the film roll chamber. By closing the bottom cover 40, an appropriate light-shielding ability can be obtained. In addition,
The bottom covers 39 and 40 are connected to the rear cover 20 via a flexible thin portion, and the bottom cover 39 is used to move the film cartridge 1 from the lens-equipped film unit 2 after use.
Opened when taking out 4.

The hoisting knob 12 is rotatably mounted on the upper part of the cartridge chamber 36. The hoisting knob 12 has a gear formed on the outer periphery, and a drive shaft formed on the lower surface is engaged with a spool 25 of the cartridge body 22. The photo film 22 is wound up by the spool 25 by being rotated counterclockwise in the drawing every time one frame is shot. Further, the winding knob 12 is prevented from rotating in the reverse direction by the engagement of the check pawl 42 formed on the upper surface of the cartridge chamber 36 with the gear.

Although not shown, the cartridge chamber 36
When the film cartridge 14 is taken out of the cartridge chamber 36, a light-shielding lid closing mechanism that closes the light-shielding lid 26 in conjunction with opening of the bottom lid 39 is incorporated in the upper surface and the side surfaces of the cartridge.

The exposure unit 17 includes a well-known shutter charging mechanism, a film winding-stopping mechanism, a counter feed mechanism for moving a counter 69, and a like, similarly to a conventional lens-fitted film unit using a 135-size photographic film. In addition to a shutter driving mechanism, shutter blades, a photographing lens 9 and the like, an objective lens and an eyepiece constituting the viewfinder 8 are unitized. Further, the exposure unit 17 is provided with a sprocket (not shown) which meshes with the perforations 28 and 29 of the photographic film 23 and is driven and rotated by the transfer of the photographic film 23. The shutter charge mechanism, the film winding mechanism, It is the driving source of the counter feed mechanism.

FIG. 4 is a perspective view showing a strobe device incorporated in the film unit with a lens according to the present invention. FIG. 1 is a cross-sectional view of a film unit with a lens of the present invention in the vicinity of a strobe device. The strobe device 18 includes a circuit board 44 provided with a strobe circuit,
The strobe light emitting unit 1 mounted on the circuit board 44
1 and a dedicated dry battery 52 which is a power source of the strobe device 18.

The circuit board 44 on which the strobe circuit pattern is formed is provided with various electric components such as a main capacitor 48 constituting a strobe circuit described later, a strobe charging switch 49 and a synchro switch 50. The strobe charging switch 49 is a metal contact disposed on the back side of the strobe charging operation button 10 formed on the front surface of the front cover 19.
By pressing 0, the charging start contact pieces 49a and 49b formed on the circuit board 44 come into contact with the copper foil portions, and the flash circuit is closed to perform flash charging.

The synchro switch 50 comprises two metal switch pieces 50a and 50b.
When pressed by the swinging of the shutter blades incorporated in 7, the two switch contact pieces come into contact with each other to emit strobe light. Above the circuit board 44, a charging completion lamp 65 which lights up when the charging of the main capacitor 48 is completed.
Is provided.

The strobe light emitting section 11 is filled with an inert gas and discharges by applying a high voltage to emit strobe light.
A reflector 46 for efficiently reflecting the light emitted from the object toward the subject, a diffusion plate 11a for diffusing light from the discharge tube 45, and a holding member 11b attached to the circuit board 44 while holding these. From the light-emitting portion opening 19a formed in the upper part of the front cover 19,
The diffusion plate 11a is exposed outside.

Behind the holding member 11b of the strobe light emitting portion 11, a plus metal contact piece 5 for connecting the plus pole 52b and the minus pole 52a of the dedicated dry battery 52 to the strobe circuit.
3 and a negative metal contact piece 54 are provided, and a dedicated dry battery 52 is provided between the two metal contact pieces 53 and 54.
The strobe discharge tube 45 is sandwiched in parallel with the length direction.

The dedicated cylindrical battery 52 for supplying power to the strobe device 18 is, for example, an AA battery (R).
6, LR6), which is 50.5 mm, and the diameter is 10.5 mm, which is the same as AAA batteries (R03, LR03).
The dedicated dry battery 52 of such a size constitutes a AAA dry battery among conventional AA dry batteries 71 and AAA dry batteries 72 formed by stacking three anode pellets 71a and 72a shown in FIG. Anode pellet 72a
It is configured by connecting two sets of small batteries 72b each of which is used in series.

As described above, the dedicated dry battery 52 is constructed by connecting two sets of small batteries 72b using two anode pellets 72a used in the AAA battery 72 in series.
At a voltage of about 3 volts higher than 1.5 volts,
This is a high-voltage, small-capacity compact dry battery having the same length as the dry battery (reference numeral L in the figure) and the same diameter as the AAA battery (reference numeral R in the figure).

As shown in FIG. 1, a main capacitor 48 is mounted below the circuit board 44. As described above, the strobe device 18 in the film unit with lens 2 of the present invention is different from the conventional strobe device for a film unit with lens in that the dedicated dry battery 52 serving as a power source is provided on the upper part, and the main condenser 48 is provided on the circuit board 44. Each is laid out at the bottom.

FIG. 5 is a circuit diagram of such a strobe device 18. As shown in FIG. The strobe circuit of the strobe device 18 includes a transformer 61 for boosting, a strobe charging switch 49, a main capacitor 48, a synchro switch 50 which is turned on in conjunction with a shutter release, a trigger capacitor 62,
Diode 63, charge completion lamp 65, strobe discharge tube 45, battery discharge circuit 64, and dedicated dry battery 52 described above.
And so on.

The battery discharge circuit 64 includes a resistor 65
And a counter interlock switch 66 that operates in conjunction with the counter 69. The counter interlock switch 66 is turned on in conjunction with the display of the counter 69 displaying “E” indicating the completion of image capturing of all image frames. Thus, when the photographing of all the photographing frames of the film unit with lens 2 is completed, a current flows through the battery discharging circuit 64 and is consumed by the resistor 65 until the electromotive force of the dedicated dry battery 52 disappears.

The operation of the lens-fitted film unit having the above configuration will be described. In manufacturing the flash unit 18 in the film unit 2 with lens of the present invention, the power supply of the flash unit 18 is set to a voltage of 1.5 volts, which is the voltage of the AA battery, which is the power supply of the conventional flash unit for the film unit with lens. High, for example, 2
By using the dedicated dry battery 52 having twice the electromotive force of 3 volts, even if an inexpensive one having a small number of turns is used for the transformer 61, the voltage is sufficiently increased to a voltage required for charging the main capacitor 48. It is possible.

Also, by using a large-diameter discharge tube, which is cheaper than the conventional one, as the strobe discharge tube 45, the withstand voltage value becomes higher than that of the conventional strobe discharge tube, so that the conventional strobe device for a film unit with a lens is used. The power supply limiting circuit (auto-cut circuit) for protecting the strobe discharge tube, which is incorporated in the device, can be omitted, and it is not necessary to use an expensive zener diode or the like.

By using the inexpensive large-diameter strobe discharge tube 45 as described above, the space behind the strobe light emitting section 11 in which the main condenser is conventionally arranged is reduced, but the lens of the present invention is used. In the attached film unit 2, the dedicated dry cell 52 having a smaller diameter than the conventional AA dry cell is disposed behind the strobe light emitting unit 11, and the main condenser 48 is disposed below the dedicated dry cell 52, so that the strobe device 18 becomes smaller than before. . In addition, because of the small-diameter dedicated battery, the depth of the reflector 46 can be made long, which contributes to an increase in luminous efficiency.

As described above, by using the dedicated dry battery 52 having a smaller voltage and a higher voltage as the power source for the strobe device 18, the transformer 61 and the strobe discharge tube 4 can be used.
5, or a transistor or the like that is less expensive than the conventional one can be used, and a power supply limiting circuit (auto cut-off circuit) that requires an expensive zener diode or the like can be omitted. Can also be significantly reduced. Although the dedicated dry battery 52 is not commercially available, the cost can be reduced to a level that is not much different from the conventionally used AA dry battery by introducing it into a mass-produced film unit with a lens.

Next, when performing flash photography using the lens-fitted film unit 2 of the present invention, first, the user presses the flash charging operation button 10. Then, the flash charging switch 49 is turned on, and the voltage of 3 volts of the dedicated dry battery 52 is boosted by the transformer 61 or the like,
Charging of the main capacitor 48 and the trigger capacitor 62 is started. When the main capacitor 48 is sufficiently charged, the charging completion lamp 65 is turned on to prompt the user to stop pressing the flash charging operation button 10 and turn off the flash charging switch 49.

At the time of such charging, the dedicated dry cell 5
Since the voltage of 2 is higher than the conventional 1.5 volts, for example, 3 volts, which is twice as large, the charging of the main capacitor 48 is performed very quickly in a shorter time than in the conventional case, and it is possible to quickly respond to a photo opportunity. . As shown in FIG. 6, by using the dedicated dry battery 52 having a high voltage, the main capacitor can be charged to a high voltage in a short time as compared with a conventional flash device using a 1.5 volt dry battery. Become. In addition, by using a large-diameter strobe discharge tube having a high withstand voltage, a power supply limiting circuit (auto-cut circuit) is not required, and the charging level of the main capacitor can be sufficiently increased.

When the photographing of all the photographed frames is completed and the photographic film 23 is wound up into the cartridge body 22 to the rear end, the display of the counter 69 changes to "E" indicating the completion of photographing of all the photographed frames, and The interlock switch 66 is turned on. As a result, a current flows through the battery discharge circuit 64 and is consumed by the resistor 65 until the electromotive force remaining in the dedicated dry battery 52 disappears.

As described above, the electromotive force remaining in the dedicated dry battery 52 is consumed in conjunction with the completion of the photographing of all the photographed frames, thereby preventing unauthorized refilling of the photo film. Since the dedicated dry battery 52 is of a special size and is not generally available on the market, if the dedicated dry battery 52 cannot be used, the use of the strobe device becomes impossible, and irregular refilling of which the quality is not guaranteed cannot be substantially prevented. Since the capacity of the dedicated battery 52 is smaller than that of the conventional AA battery, 70 to 90% of the electromotive force of the entire battery is maintained even after the completion of the shooting of all the frames, like the battery of the conventional flash device. There is no waste that remains.

In each of the above embodiments, the APS-compatible film unit with a lens has been described as an example. However, the present invention can be applied to a film unit with a lens for loading a 135-size photographic film cartridge. It is possible. Further, the size of the dry battery is not limited to the above-described embodiment, and a dry battery of any size can be used.

Further, in the strobe device of the above-described embodiment, a type in which the strobe charging operation button 10 is continuously pressed until the charging is completed has been described. Of course, if the strobe charging operation button is pressed only once, the charging is completed. The present invention can be similarly applied to a one-push type strobe device that automatically charges up to one charge.

[0043]

As described above, according to the film unit with the lens of the present invention, the power supply of the strobe device is
Since a single cylindrical battery having a voltage higher than 1.5 volts is used, the charging time can be shortened, and a small and low-cost film unit with a built-in strobe device can be provided. .

[Brief description of the drawings]

FIG. 1 is a sectional view of the vicinity of a flash device in a film unit with a lens according to the present invention.

FIG. 2 is a perspective view showing the appearance of a film unit with a lens according to the present invention.

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

FIG. 4 is an external perspective view showing a strobe device.

FIG. 5 is a circuit diagram showing an example of a strobe circuit.

FIG. 6 is a graph showing the relationship between the charging time of a strobe device and the charging voltage of a capacitor in a film unit with a lens according to the present invention and a conventional lens unit.

FIG. 7 is an explanatory view showing an internal structure of a dry battery used in the present invention and a conventional film unit with a lens.

[Explanation of symbols]

 2 Film unit with lens 3 Unit body 18 Strobe device 19 Front cover 20 Rear cover 44 Circuit board 48 Main condenser 52 Dedicated dry cell

Claims (4)

[Claims] 1. A simple photographing mechanism containing an unexposed photographic film and having a photographing lens, a shutter device, etc., a circuit board on which a circuit pattern is formed, a main capacitor,
A lens unit including a strobe discharge tube and a strobe device including a power supply, wherein the power supply is a single cylindrical dry battery having a voltage higher than 1.5 volts. With film unit. 2. The film unit with a lens according to claim 1, wherein the dry battery comprises a number of unit cells stacked. 3. The dry battery is provided on a back side of the strobe discharge tube in parallel with a length direction of the strobe discharge tube,
The film unit with a lens according to claim 1, wherein the main capacitor is provided below the dry battery. 4. The strobe device according to claim 1, further comprising a discharge circuit for discharging all the electric power remaining in the dry battery after the photographing of all the frames of the photographic film is completed. 3. The film unit with a lens according to any one of 3.