JPH1068990A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain space-saving by combining and arranging an improved battery with the other member at the inside of a take-up spool at a camera using the improved battery capable of being repeatedly discharged and charged. SOLUTION: As for the camera where a main battery 34 is charged by a charging circuit by having an auxiliary battery 40 such as an AA type battery or the like as a charging power source and power is supplied to the camera circuit of a film feeding motor 30 or the like from the main battery 34; the film feeding motor 30 and the main battery 34 are arranged up and down at the inside of the take-up spool 28. Then, a main battery housing case 35 surrounding the periphery of the main battery 34 is provided, so that the rotating take-up spool 28 is prevented from being brought into direct contact with the main battery 34, and also the positive electrode of the main battery 34 is made to directly abut on a printed circuit board 46, so that an armature member is eliminated. Also, the housing part of the main battery 34 is made to have a light-shielded structure by the main battery housing case 35, so that light is prevented from entering the inside of a spool chamber at the time of exchanging the main battery 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera having a power supply device capable of supplying a large capacity and a large current to a circuit such as a strobe or a film winding means using a rechargeable battery of a metal lithium series. About the camera.

[0002]

2. Description of the Related Art A conventional camera uses a manganese or lithium primary battery as a power source and a secondary battery such as a NiCd battery as a power source. Also, a power supply device for charging a secondary battery built in a camera using a solar cell has been proposed (JP-A-63-91641). However, a manganese primary battery has a low voltage, and therefore requires a plurality of batteries to obtain a high voltage, and it is difficult to obtain a large capacity current. However, there is a problem that it is not suitable for a camera which consumes a large current in recent years. on the other hand,
Lithium-based primary batteries have the advantage of being able to obtain high voltage and large capacity current, but the batteries themselves are expensive and environmental problems at the time of disposal have been pointed out. Furthermore,
Lithium-based primary batteries are sometimes more difficult to obtain in travel destinations or overseas than manganese or alkaline primary batteries. In such cases, use the camera when the batteries are exhausted. There is a problem that it is necessary to give up or to carry a spare battery in advance in order to prevent such a situation, which is complicated.

[0003] Although charging of a primary battery is generally prohibited, as described in detail in JP-A-7-130400 and JP-A-8-84619, a lithium-based primary battery is used. Even under such conditions, charging can be performed safely under certain conditions. Lithium-based batteries (especially metal lithium-based batteries) described in these publications are charged at a time rate current of about 2 μC to 5 mC when the remaining amount is within a range of 5 to 95% of the capacity. As a result, without impairing the properties of the original primary battery,
Charge and discharge can be repeated. In each of the above publications,
There is disclosed a method in which the lithium battery and the solar battery are combined and applied to a camera, and the lithium battery is charged by electric power generated by the solar battery.

[0004] In the present specification, a battery having both characteristics of a primary battery and characteristics of a secondary battery is referred to as an "improved battery".
I will call it.

[0005]

However, in a power supply device having a solar cell, the solar cell itself is expensive, and the temperature of the camera increases due to the need to expose the camera to high illuminance during charging. There was a risk of failure. Furthermore, when the secondary battery (improved battery) is rapidly consumed, the problem that the camera cannot be used has not been solved because the amount of power generated by the solar battery is small and it takes time to charge.

From this point of view, there has been proposed a power supply device having a configuration in which the improved battery is charged by an auxiliary battery such as an AA battery (see Japanese Patent Application No. 7-273050). When incorporating the improved battery into the camera, it is desirable to reduce the size of the camera by saving space and reducing the number of parts while considering the relationship with other members constituting the camera.

The present invention has been made in view of such circumstances, and has as its object to provide a small camera using a battery (improved battery) that can be repeatedly discharged and charged.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a main battery which is substantially equal to the self-discharge rate of a primary battery and which can be repeatedly discharged and charged when the remaining amount is more than a predetermined capacity. An auxiliary battery that supplies charging energy to the main battery; and a booster that boosts an output voltage of the auxiliary battery. The power is supplied to the main battery via the booster and the main battery is charged. Charging means, a film transport motor that is supplied with power from the main battery and provides motive power for transporting the film, a take-up spool for winding a film drawn from a film cartridge by the power of the film transport motor, and a strobe light A take-up spool formed in a hollow cylindrical shape, and the auxiliary power supply is provided inside the take-up spool. , Film feed motor, and at least one to the main battery of the main capacitor is characterized in that it is arranged.

According to the present invention, at least one of the auxiliary battery, the film transport motor, and the main capacitor is combined with the main battery inside the hollow cylindrical take-up spool. The main battery can be effectively stored in the space. Thereby, downsizing of the camera can be achieved. When the main battery is provided inside the take-up spool, the main battery storage case surrounding the main battery is provided, so that the rotating take-up spool can be prevented from directly contacting the main battery.

In addition, by supporting the main battery storage case on the main plate serving as a bearing for receiving a radial load and a thrust load of the take-up spool, the main battery storage case is fixed stably so as not to vibrate with respect to the central axis. be able to.
The aspect of the present invention is particularly effective when the main battery storage case is enlarged in the axial direction, for example, when a main battery and a main capacitor are combined and both are stored in the main battery storage case. .

When the main battery is configured to be replaceable, it is desirable that the main battery storage case has a light shielding structure by the main battery storage case so that light does not enter the spool chamber when the battery cover is opened. On the other hand, when it is not assumed that the main battery is replaced, at least one of the positive electrode and the negative electrode of the main battery is directly brought into contact with the printed board, so that the contact piece member can be omitted. As a result, there are advantages that the wiring resistance can be reduced, energy loss can be reduced, the number of components can be reduced, and assembly is easy.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the camera according to the present invention will be described below in detail with reference to the accompanying drawings. FIG.
1 is a front internal perspective view of a camera according to an embodiment of the present invention. As shown in FIG.
A lens barrel 12 holding a taking lens 11 is provided,
A cartridge chamber 14 for accommodating a film cartridge (not shown in FIG. 1) is formed on the right side of the lens barrel 12, and a spool chamber 16 is formed on the left side. A flash device 18 is provided at the upper part of the cartridge chamber 14, that is, at the upper right corner of the front of the camera. I have.

The cartridge chamber 14 is provided with a spool drive shaft 26 which is engaged with a spool of a film cartridge loaded in the chamber, and a detection switch (not shown) for detecting the presence or absence of the film cartridge. I have. On the other hand, the spool chamber 16 is provided with a take-up spool 28 for taking up the film sent from the film cartridge. This take-up spool 2
Numeral 8 is formed in a hollow cylindrical shape, inside which a film transport motor 30 and a main battery 34 for supplying electric power to various circuits in the camera are arranged vertically.

The rotational force of the film transport motor 30 is transmitted to a take-up spool 28 and transmitted to a spool drive shaft 26 via gear trains 32A, 32B,..., 32I, 32J shown in FIG. To be transmitted. That is, when the film transport motor 30 rotates forward,
The film is sent out from the film cartridge loaded in the film cartridge chamber 14 and is taken up on the take-up spool 28. The film transport motor 30
Is reversed, the spool drive shaft 26 of the film cartridge chamber 14 is reversed, and the film wound on the take-up spool 28 is rewound into the film cartridge. The rotation of the film transport motor 30 is controlled by the camera controller, and the film is fed one frame (winding up). When the end of the film is detected after all the frames of the film have been photographed, the film transport motor 30 is driven in reverse, and the drawn-out film is automatically rewound into the film cartridge. A film rewind lever (not shown) is provided on the back of the camera 10. By operating the film rewind lever, the film can be rewound to the film cartridge halfway before the completion of all frame shooting. It has become.

The main battery 34 is a rechargeable battery dedicated to a camera having a small self-discharge, and is an improved battery having both characteristics of a primary battery and a secondary battery. Main battery 3
Although the configuration of No. 4 will be described in detail later, for example, a battery having a self-discharge rate of 5% / year or less is used, and its voltage is 3.2 V when properly charged. The main battery 34
Is not particularly limited and may be any shape, but is generally formed in a columnar shape, for example, in the same shape as a current CR2-type battery.

A main battery storage case 35 surrounding the main battery 34 is provided inside the take-up spool 28. The main battery storage case 35 is formed in a cylindrical shape with an open lower surface, and a printed board on which a booster circuit 44 for charging and a charging circuit 45 for the main capacitor 36 are formed below the main battery storage case 35. 46 are provided. The main battery 34 is disposed in the main battery storage case 35 with the positive electrode facing down, and the positive electrode directly contacts the printed board 46 and is connected to an electric circuit.

On the left side of the spool chamber 16, a main capacitor 36 (not shown in FIG. 1) for accumulating electric charge for strobe light emission and an auxiliary battery 40 for supplying charging energy to the main battery 34 are arranged in front and rear. (Fig. 2
reference). That is, the main capacitor 36 has a cylindrical shape,
The axis indicating the longitudinal direction and the axis of the take-up spool 28 are arranged in parallel with each other, and the auxiliary battery 40 is arranged behind the main condenser 36 in parallel with the arrangement direction of the main condensers 36.

A battery cover 42 for an auxiliary battery is provided at the rear corner of the camera 10 so as to be openable and closable on a shaft 42A, and an auxiliary battery storage chamber formed inside the battery cover 42 for the auxiliary battery. , An auxiliary battery 40 is housed therein. And
By opening the battery cover 42 for the auxiliary battery, the auxiliary battery 40 stored in the auxiliary battery storage chamber can be taken out and replaced.

The auxiliary battery storage chamber is, for example, one AA
A manganese-based AA battery is housed as the auxiliary battery 40. The auxiliary battery 40 is not limited to an AA battery, but may be a primary battery of another form. However, manganese-based AA batteries are widely used and can be easily obtained at low cost anywhere in the world. There are advantages.

A contact member 48A for the negative electrode of the auxiliary battery 40
Is formed with a lever portion bent upward in a substantially V-shape, and an insulating member 52 is fixed to a distal end portion thereof.
A pair of upper and lower contact pieces 5 is provided above the lever portion.
A switch 56 composed of 4 and 55 is provided. When the auxiliary battery 40 is loaded, the contact piece member 48A is pushed upward in the drawing, and the lever portion is raised. Then, the contact piece 55 is pushed up via the insulating member 52 by the rise of the lever portion, and the contact pieces 54 and 55 of the switch 56 come into contact with each other, and the switch 56 is turned on. On the other hand, auxiliary battery 4
When 0 is removed, the contact piece member 48A is lowered to the lower side in the drawing, and with this movement, the lever portion is lowered, and the contact of the switch 56 is separated. Based on the ON / OFF state of the switch 56, whether or not the auxiliary battery 40 is loaded is detected. Reference numeral 60 above the switch 56 and shown by a two-dot chain line in the figure indicates a mounting space for a control circuit of the camera.

Although not shown in detail, the main battery 34 and the auxiliary battery 40 are connected to a contact piece 47, respectively.
48A, 48B, etc., it is electrically connected to an electric circuit such as the booster circuit 44, etc., from the main battery 34 to the strobe device 18, the film transport motor 30, the zoom motor 62
And so on. The power of the zoom motor 62 is transmitted to the lens barrel 12 via a power transmission mechanism (not shown). As shown in FIG. 3, the lens barrel 12 includes a first lens barrel 12A that holds the photographing lens 11.
And a second lens barrel 12B and a third lens barrel 12C that support the first lens barrel 12A movably back and forth along the optical axis,
The first and second lens barrels 1 are driven by the power of the zoom motor 62.
2A and 12B expand and contract back and forth. As a result, the position of the photographing lens 11 moves along the optical axis, and the photographing magnification can be changed.

Next, the main battery will be described. Main battery 3
4, the improved battery is used as described above. As the positive electrode active material of the improved battery, manganese dioxide is preferable, and particularly, manganese dioxide synthesized by electrolysis and manganese dioxide chemically synthesized are preferable. As a material that can be used as the negative electrode active material, lithium metal and lithium alloy (any metal that forms an alloy with lithium may be used, but Al, Mn, Sn, Mg, Cd, and In are particularly preferable, and an alloy containing Al is particularly preferable). Preferably, it is used.

A conductive agent, a binder, a filler, and the like can be added to the electrode mixture. The conductive agent may be any electronic conductive material that does not cause a chemical change in the configured battery. The addition amount is not particularly limited,
It is preferably from 1 to 50% by weight, particularly preferably from 2 to 30% by weight. As the binder, a polysaccharide, a thermoplastic resin, a polymer having rubber elasticity, or a mixture thereof can be used. The amount of the binder added is not particularly limited, but is preferably 1 to 50% by weight, and particularly preferably 2 to 30% by weight.

As the filler, any fibrous material that does not cause a chemical change in the constructed battery can be used. Usually, fibers such as olefin-based polymers such as polypropylene and polyethylene, glass, and carbon are used. Although the amount of the filler is not particularly limited,
~ 30% by weight is preferred. The non-aqueous electrolyte is generally composed of a solvent and a lithium salt (anion and lithium cation) dissolved in the solvent, and comprises propylene carbonate and / or butylene carbonate and 1,2-dimethoxyethane and / or diethyl carbonate. An electrolyte containing LiCF ₃ SO ₃ , LiClO ₄ , LiBF ₄ and / or LiPF ₆ in the mixed solution of the carbonate is preferable. The amount of these electrolytes to be added to the battery is not particularly limited, but may be used in a required amount depending on the amounts of the positive electrode active material and the negative electrode active material and the size of the battery.

The volume ratio of the solvent is not particularly limited.
In the case of a mixture of propylene carbonate and / or butylene carbonate to 1,2-dimethoxyethane,
0.4 / 0.6 to 0.6 / 0.4 is preferred. The concentration of the supporting electrolyte is not particularly limited, but may be 0.1 to 1 liter of the electrolytic solution.
2-3 moles are preferred. The metal lithium-based battery having such a configuration has a self-discharge rate as small as that of a primary battery, and when discharged from a fully charged state to below a specified energy value, the function as a storage battery thereafter rapidly increases. It has the property of decreasing to With the capacity in a fully charged state as 100 as a reference, the amount of discharged energy is represented by the usage rate with respect to the total energy,
I will call it.

According to an experiment, when the discharge and the charge are repeated within a range where the depth of discharge does not exceed 5%, the deterioration of the main battery is small, the cycle life is large, and photographing of 3000 shots or more is sufficiently possible. . On the other hand, when used at a depth of discharge of 30%, the performance of the main battery as a storage battery is reduced, and the cycle life is shortened. In this case, only about 1000 shots can be repeatedly shot. The deeper the depth of discharge, the shorter the cycle life becomes.The deeper the depth of discharge, the lower the performance as a storage battery, and the smaller the electrical capacity that can be stored in the main battery by recharging. Cycle life is also reduced.

That is, it is desirable to use the main battery so as to repeatedly discharge and charge the battery within a shallow depth range. Therefore, when this improved battery is actually used, a proper depth of discharge is set in accordance with the setting of the limit of use as a camera, and management is performed so that discharge and charge are repeated so as not to exceed the range of the depth of discharge. There is a need to. FIG. 4 shows an example of the configuration of a charging circuit for charging main battery 34 with auxiliary battery 40. The charging circuit 70 includes a charging control circuit 72 and a boosting circuit 74 as shown in FIG.
The charge control circuit 72, respectively detects a voltage V _CR and the voltage V _E of the auxiliary battery 40 of the main battery 34, for example, a main battery 34
The voltage V _CR, becomes smaller than the voltage value 3.2 V of the full charge state (V _CR <3.2V), and voltage V _E of the auxiliary battery 40
When V _E ≥ 0.9 V (the cut-off voltage of the auxiliary battery 40), the booster 74 is operated to charge the main battery 34.

On the other hand, the charge control circuit 72 determines that the main battery 34 is
When fully charged (voltage V_CR= 3.2V)
 Or when the auxiliary battery 40 is exhausted and the voltage V of the auxiliary battery 40 is
_EIs V _EStops booster circuit 74 when <0.9V
Let it. Further, the charge control circuit 72 controls the remaining of the auxiliary battery 40.
In order to display the amount and the like on the liquid crystal panel 80, the auxiliary battery 4
A signal indicating a voltage of 0 is output to the display control circuit 82.

As described above, the display control circuit 82 receives the signal indicating the voltage of the auxiliary battery 40 from the charge control circuit 72, the signal from the film counter indicating the remaining amount of the film, the strobe switch, the shutter button, and the self-timer. The signal from the switch etc. is added,
The required display is performed on the liquid crystal panel 80 based on these input signals. The charging control circuit 72 is supplied with driving power from the main battery 34.

Next, the boosting circuit 74 will be described. FIG. 5 is a circuit diagram showing an example of the booster circuit. As shown in the figure, the booster circuit 74 is a push-pull type, and the power source of the auxiliary battery 40 is
2, the current is converted into alternating current by the transistors Q1 and Q2 which are turned on alternately by the transistor 2, and the voltage is boosted via the transformer T.
By rectifying by 5, the DC voltage is converted to a DC voltage necessary for charging the main battery 34.

Here _, assuming that the number of turns on the primary side and the secondary side of the transformer T is n _1, n ₂ , the voltage V on the primary side of the transformer T is
₁ and the voltage V ₂ on the secondary side are expressed by the following equation (1):

[0032]

## EQU1 ## There is a relationship of V ₁ / V ₂ = n ₁ / n ₂ (1). On the other hand, the voltages V ₁ and V ₂ required on the primary side and the secondary side of the transformer T are:

[0033]

## EQU2 ## V ₁ = 0.9−V _DS = 0.7 [V] (Min) (2)

[0034]

V ₂ = 3.2 + 0.7 × 2 + 0.5 = 5.1 [V] (3) (where 0.9: final voltage of auxiliary battery 40 V _DS : saturation voltage between drain and source of transistors Q1 and Q2 3.2: The maximum voltage of the main battery 34 is 0.7 × 2: the voltage drop in the rectifier circuit 75). Therefore, the turns ratio n ₂ / n ₁ of the transformer T is

[0035]

## EQU4 ## n ₂ / n ₁ = V ₂ / V ₁と 7.3 (4) As described above, the charging circuit 70 shown in FIG. 4 transfers the charging energy of the auxiliary battery 40 to the main battery 34 every time the voltage V _CR of the main battery 34 becomes V _CR <3.2 V, and Charge. Then, when the main battery 34 is fully charged (when the voltage V _CR becomes 3.2 V), the charging operation is stopped.

After the main battery 34 is fully charged,
When the electric capacity of the main battery 34 decreases due to the use of the camera, the charging energy is transferred from the auxiliary battery 40. The electric capacity of the main battery 34 increases with the charging time, and the electric capacity of the auxiliary battery 40 decreases. Thus, the main battery 34
The energy of the auxiliary battery 40 is transferred to the main battery 34 in accordance with the energy consumption of the main battery 34, so that the main battery 34 is always kept in a state close to full charge.

By doing so, there is an advantage that the main battery 34 can be easily handled without fear of over-discharge deterioration. Further, since the main battery 34 is a lithium-based battery,
As compared with the auxiliary battery 40, a high voltage and a large current can be supplied to the camera, so that a camera requiring a large current can be supported, and the charging time of the strobe can be shortened.

Now, when the charging energy of the auxiliary battery 40 is transferred to the main battery 34 and the capacity of the auxiliary battery 40 reaches almost 0 (when the voltage of the auxiliary battery 40 reaches its final voltage 0.9V), thereafter, Unless you replace the auxiliary battery 40,
The charging energy is not supplied from the auxiliary battery 40 to the main battery 34. However, the main battery 34 has its voltage V
_{Since the CR} is maintained in a state of charge close to full charge, there is a certain amount of electricity that can be consumed (for example, an amount of electricity capable of taking 100 shots) until the voltage V _CR reaches a predetermined battery check level. doing. Therefore, the camera can be continuously used without immediately replacing the auxiliary battery 40 with a new one.

Also, when the auxiliary battery 40 is replaced, the auxiliary battery 40 may be an AA battery, and thus has an advantage that it can be easily obtained at low cost anywhere in the world.
Further, since the charging circuit 70 has the boosting circuit 74,
AA batteries that have been used in other devices can be used to some extent. In this embodiment, when the voltage V _CR of the main battery 34 falls below 3.2 V, the auxiliary battery 4
Although the zero charging energy is transferred to the main battery 34, the present invention is not limited to this, and charging may be started after the voltage of the main battery 34 reaches a predetermined voltage value (for example, 3.0 V). Alternatively, the number of shots after the state of full charge may be counted, and when the number of shots reaches a predetermined value (for example, 100 shots), the charging energy of the auxiliary battery 40 may be transferred to the main battery 34. However, in this case, the charge control circuit 72 needs to receive a signal indicating the number of shots from the camera side.

According to the camera constructed as described above, the film transport motor 30 and the main battery 34 are placed inside the hollow cylindrical take-up spool 28 up and down with their respective longitudinal axes aligned. Since the main battery 34 is disposed, the main battery 34 can be stored compactly. Thereby, space can be saved, and downsizing of the camera can be achieved. In particular, by providing the main battery storage case 35 surrounding the periphery of the main battery 34, it is possible to prevent the inner peripheral surface of the rotating take-up spool 28 from directly contacting the main battery 34.

As shown in FIG. 1, since the positive electrode of the main battery 34 is brought into direct contact with the printed board 46, the contact piece of the positive electrode can be omitted. Therefore, there are advantages that the wiring resistance can be reduced, energy loss can be reduced, and the number of components can be reduced. FIG. 6 shows another embodiment of the present invention,
A battery cover 83 for the main battery is provided on the bottom of the camera so that the main battery 34 can be easily replaced. The battery cover 83 for the main battery is formed in a disk shape and has a threaded portion formed on a peripheral surface thereof. The battery cover 83 is screwed into a circular opening 84 formed on the bottom surface of the camera to close the opening 84. It has become.

The main battery storage case 35 is formed of colored (for example, black) plastic which does not transmit light.
4 is completely surrounded. Then, even when the battery cover 83 for the main battery is removed, a light shielding structure is formed by the main battery storage case 35 and the main body member 85 so that light does not leak to the take-up spool 28. Main battery storage case 35
Is provided with a contact member 47 that contacts the negative electrode of the main battery 34, and the main battery 34 is electrically connected to the printed board 46 </ b> A via the contact member 47. Battery cover 8 for the main battery
A contact piece 87 with which the positive electrode of the main battery 34 comes in contact
A main body contact piece 88 that contacts the contact piece 87 is provided at a lower right portion of the main battery storage case 35 (see FIG. 7). The main body contact member is a printed board 46.
B and is connected to the main battery storage case 3
5 to close the battery cover 83 for the main battery, the positive electrode of the main battery 34 abuts on the contact member 87, and contacts the printed board 46 B via the contact member 87 and the main body contact member 88. It is designed to be electrically connected.

A speed reduction base plate 90 is provided above the take-up spool 28, that is, above the film transport motor 30. The deceleration base plate 90 is used for the film transport motor 3.
In addition to having a role as a holding member of No. 0 and a role of a bearing portion of a power transmission gear, it also plays a role of a bearing of the take-up spool 28 and a light blocking member for preventing light leakage. According to this configuration, there is an advantage that space can be saved, the main battery 34 can be easily replaced, and light can be prevented from entering the spool chamber 16 or the like when the main battery 34 is replaced. .

FIG. 8 shows a mode in which the main capacitor 36 and the main battery 34 are combined and arranged inside the take-up spool 28. Note that the same or similar members as those of the embodiment shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. A cylindrical storage case 92 surrounding the main battery 34 and the main capacitor 36 is provided inside the take-up spool 28, and the main capacitor 36 is located above the partition 93 and the main battery 36 is located below the partition 93. 34 are arranged. That is, the storage case 92 is configured such that the main battery storage case 35 shown in FIG. 6 is formed larger in the axial direction so that the main capacitor 36 can also be stored. The projection 94A is fitted and fixed so that the central axis does not vibrate.

The main plate 94 is provided with the rotating take-up spool 2.
In addition to the role of the bearing receiving the radial load and the thrust load of No. 8, it also plays the role of a light shielding member for preventing light leakage. With this configuration, the storage case 92 that is long in the axial direction can be stably assembled in the rotating take-up spool 28, and the main battery 34 and the main capacitor 36 can be protected. Further, the replacement of the main battery 34 is easy and the spool chamber 16 is replaced when the main battery 34 is replaced.
And the like can be prevented from entering light.

In the above embodiment, the case where one of the film transport motor 30 and the main condenser 36 and the main battery 34 are combined and disposed in the take-up spool 28 has been described. , The auxiliary battery 40, the film transport motor 30, and the main capacitor 36 may be combined with the main battery 34 and disposed in the take-up spool 28.

However, when the auxiliary battery 40 is combined with the main battery 34, the auxiliary battery 4 which is more frequently replaced than the main battery 34, such as disposing the main battery behind the auxiliary battery 40.
It is desirable to take care so that 0 can be easily attached and detached.

[0048]

As described above, according to the camera of the present invention, at least one of the auxiliary battery, the film transport motor, and the main condenser is combined with the main battery and provided inside the take-up spool. The arrangement is advantageous in that space can be saved and the camera can be downsized.

Since the main battery storage case is provided in the take-up spool and the main battery is stored in the case, the main battery can be protected without the rotating take-up spool coming into direct contact with the main battery. it can. In addition, by supporting the main battery storage case on the main plate receiving the radial load and the thrust load of the take-up spool, the center axis of the main battery storage case can be fixed stably so as not to vibrate. This is effective when the storage case becomes large in the axial direction.

Further, by forming the light shielding structure by the main battery storage case, the main battery can be replaced so that light does not leak. On the other hand, when it is not assumed that the main battery needs to be replaced, at least one of the positive electrode and the negative electrode of the main battery is directly in contact with the printed circuit board, so that the connecting piece can be omitted, thereby reducing energy loss. There is an advantage that the number of parts can be reduced as well as possible.

[Brief description of the drawings]

FIG. 1 is a front internal perspective view of a camera according to an embodiment of the present invention.

FIG. 2 is a top internal perspective view of the camera shown in FIG. 1;

FIG. 3 is a cross-sectional view used to explain the configuration of a lens barrel.

FIG. 4 is a block diagram including a charging circuit for charging a main battery with an auxiliary battery.

FIG. 5 is a circuit diagram illustrating an example of a booster circuit.

FIG. 6 is a main part configuration diagram showing another embodiment of the present invention.

FIG. 7 is an enlarged view of a main part showing a configuration of a contact piece abutting on a positive electrode of a main battery.

FIG. 8 is a main part configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Camera 14 ... Cartridge chamber 16 ... Spool chamber 18 ... Strobe device 28 ... Take-up spool 30 ... Film transport motor 34 ... Main battery 35 ... Main battery storage case 36 ... Main capacitor 40 ... Auxiliary batteries 44, 74 ... Booster circuit 46, 46A, 46B Printed board 70 Charging circuit 72 Charging control circuit 82 Display control circuit 83 Battery cover for main battery 90 Deceleration base plate 92 Storage case 94 Base plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akio Omiya 1-324 Uetake-cho, Omiya-shi, Saitama Fuji Photo Optical Machine Co., Ltd.

Claims (5)

[Claims] A main battery capable of repeatedly discharging and charging when the self-discharge rate of the primary battery is substantially equal to and a remaining amount is equal to or more than a predetermined capacity; an auxiliary battery for supplying charging energy to the main battery; Charging means for supplying power to the main battery via the boosting means to charge the main battery, and for transporting a film supplied with power from the main battery; A film transport motor that provides power to drive the film, a take-up spool that winds up a film drawn from a film cartridge by the power of the film transport motor, and a main capacitor that stores electric charge for strobe light emission. The take-up spool is formed in a hollow cylindrical shape, and the auxiliary battery, the film transport motor, and the main condenser are provided inside the take-up spool. Camera, characterized in that Chino least one and said main battery is disposed. 2. The camera according to claim 1, wherein a main battery storage case surrounding the main battery is provided inside the take-up spool. 3. The camera according to claim 2, wherein the main battery storage case is supported by a main plate serving as a bearing that receives a radial load and a thrust load of the winding spool. 4. A light-shielding structure for the main battery storage chamber by the main battery storage case so as to prevent light from entering the spool chamber when the battery lid is opened. 3. The camera according to claim 2, wherein: 5. The camera according to claim 1, wherein a positive electrode or a negative electrode of the main battery is directly in contact with and electrically connected to a printed board on which the booster circuit is formed.