JP2000347350A - Film unit equipped with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit equipped with a lens capable of shortening a charging time, and also, which is provided with a small-sized built-in stroboscopic device. SOLUTION: As a dry battery 41 loaded in a battery holder 42, a battery whose voltage is higher than that of a general alkaline/manganese dry battery(voltage of 1.5 V) is used. As for the dry battery 41, the external size is an IS AA type (R6), and as for the electric characteristics of the dry battery 41, the open circuit voltage is >=1.65 V and <=1.85 V, and a closed circuit voltage becomes >=1.5 V and <=1.65 V after a lapse of 0.1 second after the start of power supply with a load resistance of 1 Ω.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a film unit with a lens, and more particularly to a power supply for a built-in flash device.

[0002]

2. Description of the Related Art Some film units with a lens provided with a simple photographing mechanism, pre-loaded with an unexposed photographic film cartridge, and provided with a simple photographing mechanism have a strobe function. A conventional flash unit of a film unit with a lens includes a strobe light emitting unit 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 power supply voltage of 1.5 volts. Be composed.

[0003] By pressing a charging operation button provided on the front of the lens-fitted film unit, the voltage of the 1.5 volt dry battery is boosted to about 350 V, and the main capacitor is charged. Then, the main capacitor is discharged by a trigger discharge at the time of shutter release, and the strobe discharge tube emits light.

A typical flash device such as a compact camera uses a slightly special, expensive, high-voltage dry battery such as a dry battery having a voltage of 3 V as a power supply. However, in the case of a film unit with a lens, a general dry battery with a voltage of 1.5 V is conventionally used in order to provide the user with the lowest possible cost.

[0005]

However, since an inexpensive general dry battery having a low voltage of 1.5 V is used for the power supply of the strobe device, the amount of current per unit time is small and the charging time is long. Problem. As a result, it is difficult to perform flash photography continuously and quickly, a valuable photo opportunity is missed, and the convenience of the film unit with a lens is reduced.

On the other hand, it is conceivable to connect two 1.5V batteries in series. However, in this case, the storage space of the batteries is doubled, and the characteristics of the small and lightweight film unit with lens are impaired. It is a problem.
Also, when two dry batteries are used, the power supply capacity is too large, and the entire 7 to
90% or more of the electromotive force remains, which is not preferable in terms of cost.

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 has a short charging time, and has a small and low-cost strobe device.

[0008]

In order to solve the above problems, the present invention provides a circuit board on which electronic components constituting a strobe circuit are provided, and a substantially cylindrical dry battery serving as a power supply for the strobe circuit. In a film unit with a lens having a built-in strobe device including a battery holder for holding the dry battery and having an unexposed photographic film and a simple photographing device, the dry battery has a size of AA (R6). 0.1% after the start of energization at a load resistance of 1Ω, the closed circuit voltage is approximately 1.5 V or more and 1.65 V or less, and the open circuit voltage is approximately 1.65 V or more and 1.85 V or less. Further, in the case of the single 4 (R03) size, the closed circuit voltage is about 1.4 V or more and 1.55 V or less after 0.1 seconds from the start of energization when the load resistance is 1Ω, and the open circuit voltage is about 1.65 V or more. 1 .85V or less.

[0009]

FIG. 2 is an external perspective view showing a film unit with a lens according to the present invention, and FIG. 3 is an exploded perspective view thereof. The lens-fitted film unit 2 includes a unit main body 3 in which a photographic film is loaded in advance and various photographing mechanisms are incorporated, and a label 4 partially covering the unit main body 3.

A shutter button 5 and a counter window 6 are provided on the upper surface of the unit body 3, and a finder 7, a photographing lens 8, and a light source light-emitting portion 3 constituting a strobe device 15 are provided on the front surface.
0 and the like are provided. A hoisting knob 9 that is rotated from one frame to another is exposed from the rear side.

The label 4 is a strip of paper or a resin sheet having an adhesive applied to the back surface, and is attached so as to be wound around the central portion of the unit body 3. Label 4
An opening for exposing the photographing lens 8, the finder 7, the counter window 6, and the like to the outside is formed, and a method of using the film unit with lens 2 and notes on use are printed.

A unit main body 3 serving as a main body of the film unit with a lens includes a main body 13 into which a film cartridge 12 is loaded, an exposure unit 14 and a strobe device 15 mounted on a front surface of the main body 13, and a main body 13. And a front cover 16 and a rear cover 17 which are exterior covers that are assembled on the front side and the rear side so as to sandwich the cover. The front cover 16 and the rear cover 17 reduce the cost of the film unit 2 with a lens,
In order to reduce the size and weight, the overall thickness is reduced.

The film cartridge 12 comprises a plastic cartridge body 19 and a photographic film 20 housed in the cartridge body 19. The photo film cartridge 12 conforms to a standard called an advanced photo system. When not in use, the photo film 20 is entirely stored in the cartridge main body, and the photo film 20 is wound in the cartridge main body 19. By rotating the spool 21 in the film feeding direction, the photo film 20 can be fed from the cartridge body 19.

A photographing lens 8 is provided at the center of the main body base 13.
Is provided with a light-shielding tube 22 that shields the photographing optical path from to the photographic film 20. On the front side of the light-shielding tube 22, subject light transmitted through the photographing lens 8 is placed on the photographic film 2.
An opening 24 leading to zero is formed, and an aperture defining an exposure range to the photographic film 20 is formed on the back side.

On both sides of the light-shielding tube 22, a cartridge chamber 26 and a film roll chamber 27 for accommodating the cartridge body 19 and the rolled photographic film 20 at the manufacturing stage are integrally formed. ing. At the lower part of the rear cover 17, a bottom lid 28 of the cartridge chamber 26,
The film roll chamber 27 and the bottom lid 29 are formed integrally. The bottom cover 29 is opened when removing the film cartridge 12 from the used film unit 2 with lens.

A winding knob 9 is rotatably mounted on the upper part of the cartridge chamber 26. The hoisting knob 9 has a drive shaft formed on the lower surface and a cartridge main body 19.
Is engaged with the spool 21. Then, the photo film 20 is wound up by the spool 21 by being rotated counterclockwise in the drawing every time one frame is shot. Although not shown, light-shielding lids for opening and closing the film entrance of the cartridge body 19 in conjunction with opening of the bottom lid 28 when removing the film cartridge 12 from the cartridge chamber 26 are provided on the upper surface and side surfaces of the cartridge chamber 26. A light-shielding lid closing mechanism is incorporated.

The exposure unit 14 has a shutter charge mechanism, a shutter release mechanism, a film unwinding mechanism, and a film count mechanism integrally incorporated with the photographing lens 8 and the finder lens 33. Then, it is detachably attached to the front surface of the light-shielding tube 22 of the main body 13 by engaging a claw.

The rear cover 17 is detachably attached to the back of the main body 13 to shield the inside of the main body 13 from light. On the inner wall surface of the rear cover 17, a film supporting surface 17a for supporting the rear surface of the photographic film 20 behind the aperture, a passage surface 17b for forming a film passage together with the rear surface of the main body 13, and the like are formed.

The front cover 16 is formed integrally with the shutter button 5 and is detachably mounted on the front side of the main body 13. In addition, an opening 39 for exposing the light source light emitting unit 30 of the strobe device 15 to the outside is formed at a front corner of the front cover 16.

FIG. 1 is a perspective view showing a strobe device of the present invention. The strobe device 15 includes a light source light emitting unit 30, a circuit board 35, and a dry battery 41 serving as a power supply.

The light source light emitting section 30 is provided with a flash discharge tube and a reflection mirror surrounding the discharge tube, and a protector 44 is mounted on the front surface. A well-known electronic component such as a transistor, a resistor, and a capacitor is disposed on the circuit board 35. A synchro switch 46 that turns on and off in conjunction with opening and closing of a shutter blade (not shown) of the exposure unit 14 is provided. Connected.

At one end of the circuit board 35, a battery holder 42 comprising a negative contact piece 36 and a positive contact piece 47 is formed, and a dry battery 41 is mounted to supply power to the strobe circuit. The positive electrode contact piece 47 and the negative electrode contact piece 36 are entirely formed by bending a metal plate, and the positive electrode terminal 41a and the negative electrode terminal 41b of the dry battery 41 are formed.
, And hold the dry battery 41 by elasticity.

The battery 41 mounted on the battery holder 42 has a higher voltage than a conventional general alkaline-manganese dry battery (nominal voltage 1.5 V). This battery 41 is an AA type (R
6) whose electrical characteristics are that the open-circuit voltage is 1.65 V
Not less than 1.85 V and a closing voltage of 1.5 V to 1.65 V 0.1 second after the start of energization with a load resistance of 1 Ω
It has the following characteristics.

By using such a dry battery 41 having a high closed circuit voltage at a low load, the take-out voltage can be increased at the time of charging the capacitor.
Compared to a conventional alkaline-manganese dry battery having a nominal voltage of 1.5 V, the charging time can be reduced by about 30% under the same conditions. This makes it possible to quickly perform flash photography without missing a precious shutter chance. Also, since the external dimensions of the dry battery 41 are the same as the conventional AA battery, the battery storage space is not increased at all, and the lens is smaller than the case where two dry batteries are built in to increase the take-out voltage. It is possible to make the attached film unit compact and lightweight.

A dry battery 41 improved based on an alkali-manganese dry battery produces a potential difference greater than manganese dioxide in electrolytic manganese dioxide, which is a positive electrode material, in order to increase the take-out voltage without changing the external dimensions. The substance has been added. Examples of the additive include a nickel compound, silver oxide, silver peroxide and the like.

In addition, zinc-nickel dry batteries, alkaline
A manganese-lithium dry battery, a silver oxide dry battery, a lead storage battery and the like can be mentioned. The external shape of these dry batteries is preferably AA type (R6), AA type (R03), AA type (R1) or the like, which are international standards.

Hereinafter, test results showing the characteristics of the improved dry battery used in the film unit with a lens of the present invention will be described. Table 1 shows the test results of the electrical characteristics of the dry battery of the present invention and the conventional dry battery. Note that the open circuit voltage is JI
The voltage value at both ends of the dry battery was measured by a voltmeter according to S. The closed circuit voltage is a value obtained by measuring the voltage between both terminals of the battery when a constant resistance is applied to the battery. The resistance value is 1Ω, and the voltage measurement timing is 0.1
Seconds later. All test samples used were new and unused. N in the table is the number of samples.

[0028]

[Table 1]

According to Table 1, the dry battery of the film unit with the lens of the present invention has higher open circuit voltage and close circuit voltage than the conventional battery, and has a longer capacity indicating time.

Tables 2 and 3 show that, using the dry battery of the present invention and the conventional dry battery, two and 50 times of strobe light emission were performed by two types of film units with a lens, and the subsequent charging time was measured. It is a test result.

[0031]

[Table 2]

[0032]

[Table 3] * Full charge level: Full charge.

[0033]

As described above, according to the present invention, a circuit board on which electronic components constituting a strobe circuit are provided,
In a film unit with a lens including a substantially cylindrical dry battery serving as a power supply of the strobe circuit and a strobe device including a battery holder for holding the dry battery, and including an unexposed photographic film and a simple photographing device, When the dry battery is AA (R6) size, the closed circuit voltage is about 1.5 V or more after 0.1 seconds from the start of energization at a load resistance of 1Ω.
65V or less and the open circuit voltage is substantially 1.65V or more and 1.85V or less.
3) In the case of size, energization start when load resistance is 1Ω 0.1
Since the closed circuit voltage after the second is approximately 1.4 V or more and 1.55 V or less and the open circuit voltage is approximately 1.65 V or more and 1.85 V or less, the charging time is shortened. It is possible to provide a small and low-cost film unit with a lens having a built-in strobe device.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a flash device of a film unit with a lens according to the present invention.

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

FIG. 3 is an exploded perspective view of FIG. 2;

[Explanation of symbols]

 2 Film unit with lens 3 Unit main body 15 Strobe device 16 Front cover 17 Rear cover 36 Negative contact piece 30 Strobe light emitting part 41 Dry battery 51a Positive terminal 51b Negative terminal 42 Battery holder 47 Positive contact piece

Claims (1)

[Claims] 1. A strobe device comprising a circuit board on which electronic components constituting a strobe circuit are disposed, a substantially cylindrical dry battery serving as a power supply of the strobe circuit, and a battery holder for holding the dry battery. A film unit with a lens provided with an unexposed photographic film or a simple photographing device, wherein the dry battery is a AA (R6) size, the load resistance is 1 Ω, and the closing voltage is 0.1 seconds after the start of energization at a load resistance of 1Ω. Is almost 1.5V
Not less than 1.65 V and the open-circuit voltage is approximately 1.
It has a characteristic of 65 V or more and 1.85 V or less, and in the case of a AAA (R03) size, the closed circuit voltage is about 1.4 V or more and 1.55 V 0.1 seconds after the start of energization at a load resistance of 1Ω.
Or less, and the open circuit voltage is approximately 1.65 V or more.
A film unit with a lens, characterized in that the film unit has a characteristic of 85 V or less.