JPH0310083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power supply device built into a camera device.

Modern camera devices extremely utilize IC circuits for arithmetic processing in various automatic exposure methods such as aperture-priority or shutter speed-priority systems, and for displaying various exposure information using elements such as liquid crystals. It's getting more and more common.

On the other hand, as a power source for camera equipment,
Small-capacity button-type batteries such as mercury batteries that are housed within the outer wall of the camera, and AA-type dry batteries that are removably installed and can withstand large amounts of power consumed by motors, strobe devices, etc., are well known.

By the way, as a power source for the IC circuit mentioned earlier,
As is well known, a small capacity power source such as the above-mentioned mercury battery or silver battery is sufficient, and an AA type power source is not required.

However, camera devices that use a built-in motor to automatically wind and rewind the film cannot be used as a power source for IC circuits for arithmetic processing or display functions in the various automatic exposure means mentioned above.
It is configured so that the power source for driving the motor or for the strobe device can be used in common. Therefore, since the voltage of the power supply may fluctuate greatly when the motor or strobe device is driven, some kind of voltage stabilization circuit is required, making the power supply means complicated.

In addition, when power supplies are shared, the frequency of power supply replacement becomes inevitable, and depending on the characteristics of the IC used, a state without a power supply may become extremely inconvenient, and there is a risk that the desired operation may not be expected. It was hot.

That is, it is possible to replace the power supply battery in a conventional camera device at any time.For example, it is possible to replace the battery even while loading film and taking pictures.
For example, if an IC circuit whose operating state changes when the power goes out is used to display the number of film frames,
When replacing the power supply, the operation of the IC circuit changes,
This creates an extremely inconvenient situation in which the desired display cannot be performed, and as a result, in conventional camera devices with a built-in power supply that share a large-capacity and small-capacity power supply, there is a problem that the IC circuits that can be used are limited. Was. Moreover, the fact that it can be replaced at any time also has the problem that if it is accidentally removed from the battery or a predetermined position, the above-mentioned IC circuit may be adversely affected.

The present invention has been made in consideration of the above points, and in order to avoid complication of the power supply means, two power supply units of small capacity and large capacity are configured, and the above-mentioned small capacity power supply, that is, the IC circuit. The present invention provides a power supply means characterized in that the power supply for the camera cannot be replaced when the camera is loaded with film, which can be considered to be in operation, and will be explained below with reference to the drawings.

FIG. 1 shows one embodiment of the power supply means according to the present invention, and is a schematic diagram of the arrangement positions of small capacity and large capacity power batteries.

In the figure, 1 is a camera main body having a film loading chamber 2, a film winding chamber 3, a back cover 4, a shutter button 5, etc.; 6 is a storage chamber for a small-capacity battery 7 provided in the camera main body 1; 8 is the camera device main body 1
10 is a first switch disposed in the film loading chamber 2 for detecting whether or not a film is loaded; 11 is a second switch for detecting the middle press state of the shutter button 5; 12 is a sprocket 13 that guides the film.
A third switch is shown which detects when the film has been fed by a predetermined amount.

In general, when attempting to obtain small-capacity and large-capacity power sources using batteries, it is necessary to take into consideration the large differences in their shapes. In invention,
As is clear from the embodiment in FIG. 1, the small-capacity power supply battery 7 is small in size and does not require a large space, so it is not shown in the camera device main body 1 near the film loading chamber 2. Since the large-capacity power supply battery 9 is provided with a battery cover that does not have a battery cover and has a large size, it is provided at the bottom of the camera device main body 1 independently from the small-capacity power supply battery 7 so that it can be attached or detached at any time. .

With the above configuration, the power supply means in the camera device according to the present invention has a small-capacity power battery and a large-capacity power battery, and there is no need to provide any voltage stabilizing circuit, It goes without saying that the battery needs to be replaced frequently, since the battery 7 has a large capacity, and as is clear from the position shown in Fig. 1, the battery 7 has a large capacity, and as is clear from the position shown in Figure 1, when the film is loaded, it Since the battery is covered by the battery, it cannot be replaced, and there is no adverse effect on the IC circuit etc. even when large capacity batteries are frequently replaced.

On the other hand, in Figure 2, figure numbers 10, 11, and
It is an electric circuit diagram showing the relationship between each switch indicated by 12, the power source batteries indicated by 7 and 9, and a load not shown.

In the figure, reference numeral 14 denotes an IC circuit which is a load (not shown in FIG. 1), which performs arithmetic processing of, for example, an exposure control circuit. Reference numeral 15 is a motor as a load, and reference numeral 16 is a display section which displays, for example, the number of film frames by the operation of the IC circuit 14.

When taking a picture, when the film is loaded and the back cover 4 is closed, the first switch 10 is turned on, and the small capacity battery 7 is supplied to the IC circuit 14 and display unit 16, and these loads are ready for operation. becomes.

Next, when the shutter button 5 is released and a photograph is taken, the film is wound in a well-known manner. At this time, switch 1, which is linked to the sprocket that guides the film,
2 is activated when a predetermined amount of film is fed, and the operation of this switch 12 is transmitted to the display section 16 via the IC circuit 14 and also to the control circuit 17.
The signal is also transmitted to stop the operation of the motor 15.

On the other hand, when the back cover 4 is closed with no film loaded, the switch 10 for detecting film loading is turned off, so the small capacity power battery 7 is connected to the IC circuit 14 and the display section 16. The structure is such that power is not wasted without being supplied to the power source.

By the way, even in the above state, when the shutter button 5 is released, the switch 11 is turned on when the shutter button 5 is pressed down, and the IC circuit 14 is turned on.
When power is supplied to the shutter button 5, etc., and the shutter button 5 is further pressed, the motor operates as in the previous case, and since there is no film in this case, the switch 12 linked to the sprocket does not operate, so for example, the control circuit 17 The internal timer circuit performs a series of operations such as stopping the operation of the motor.

However, when the shutter button 5 is released, the switch 11 is turned off.
Since the supply of the power battery 7 to the IC circuit 14 and the like is stopped, the IC circuit 14 and the display section 16 do not operate.

That is, the above-mentioned switch 11 once puts the IC circuit etc. into a ready state for operation by the release operation of the shutter button, and then returns to the initial state.As a matter of course, the above-mentioned display indicates that no film is loaded. This can be recognized by the change of the unit 16 from the ready state to the initial state.

FIG. 3 shows the main parts of another embodiment of the power supply device according to the present invention, in which a small-capacity power supply battery is arranged so that it cannot be replaced when a film is loaded. Here are some other examples.

In the figure, the parts with the same numbers as those in FIG. 1 indicate the same members, and 18 indicates a battery cover that accommodates and holds the small capacity power battery 7.

In FIG. 3, the small capacity battery 7 is connected to the battery cover 18.
As shown in the figure, the end 18 of the battery cover 18 can be replaced by opening and closing the battery cover 18.
₁ engages with the locking piece 4 ₁ of the back cover 4 of the camera device.
If the opening/closing operation is not in the open state, the opening/closing operation cannot be performed. That is, when the camera is loaded with film and ready for photography, the back cover 4 is never opened, making it impossible to replace the battery.

Although not shown in the drawings, it goes without saying that a large-capacity power supply battery is disposed at the bottom of the camera device main body 1, as in the previous embodiment.

As described above, the power supply means according to the present invention has large-capacity and small-capacity power batteries built in separately, and the small-capacity power battery is configured so that it cannot be replaced while the film is loaded. This eliminates the need for a voltage stabilization circuit, which conventionally occurred due to shared power supply, and eliminates the need for IC due to frequent or incorrect operation when replacing power batteries.
This is a means of eliminating negative effects on the circuit, and has extremely high practical value.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a camera according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram of the camera of FIG. 1, and FIG. 3 is a main part of another embodiment of the power supply device of the present invention. It is a structural diagram. 1...Camera body, 2...Film loading chamber, 3
... Film winding chamber, 4 ... Back cover, 5 ... Shutter button, 6 ... Storage chamber, 7, 9 ... Battery, 1
0, 11, 12...Switch, 14...IC circuit,
15...Motor.

Claims (1)

[Scope of Claims] 1. A large-capacity power battery used as a power source for a motor or strobe device that automatically feeds the film, and a small-capacity power battery used as a power source for the camera's IC circuit are connected to the camera device itself. a storage structure in which the large-capacity power battery is housed in the camera device in a removable manner at all times regardless of whether the back cover of the camera device is opened or closed, and the small-capacity power battery is housed in an open position of the back cover 1. A power supply device for a camera, comprising a storage control configuration that allows attachment and detachment only in the camera. 2. A power source in a camera according to claim 1, wherein the storage control structure includes a housing portion for a small-capacity power source battery that is formed near the film loading chamber and covered by the loaded film. Feeding device. 3. The storage control configuration includes a recess for accommodating a small capacity power battery, a battery cover that covers the recess, and a locking piece provided on the back cover when the back cover is in the closed position. 2. The power supply device for a camera according to claim 1, further comprising a locking end portion that fits and locks the battery cover in the closed position.