JPS6113238A - Camera provided with date transfer device - Google Patents

Abstract

PURPOSE:To make information transmission of battery check unnecessary by driving a camera body control IC and a date transfer control IC with the same power source and checking a battery with the date transfer control IC. CONSTITUTION:A camera body control IC 41a and a date transfer control IC 42a are driven by the same power source 43a. The power source 43a drives a camera body load such as a flash or the like with 6V, and the IC 41a and the IC 42a are driven by the voltage which is adjusted to 3V by an adjuster 44a. A large- capacity battery is used as the power source 43a to make replacement unnecessary for a long time, and 2-3muA are always flowed to the date transfer control IC 42a to continue time counting. A battery check circuit 60a is connected to the IC 42a (or the IC 41a). Thus, the battery check of the power source 43a is performed easily, and transmission of information of battery check is made unnecessary, and time counting is always continued.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a camera equipped with a date imprinting device. The present invention relates to an improvement of a camera equipped with a date imprinting device that imprints on film in response to a signal from a control section.

[Prior art]

As shown in Figures 1 and 2, in a camera equipped with the conventional date feed device as described above, the shooting time can be controlled manually using the date feed means provided on the camera back. This is done by setting, and the camera back cover l has a crystal oscillator 2, a date advance control IC 3, and a photo LCD 4 that uses a liquid crystal facing the back of the film. Monitor LCII visible through the window of lid 1
5, an imprinting lamp 6 that irradiates light onto the back side of the film through the imprinting LC 114, and a power supply battery 7, and the imprinting time is set to 15OIO0, 2QO, 400 so that it can be pressed from the outside. A shooting time changeover switch 8 that changes cyclically according to the film sensitivity, a timing correction switch 9 for correcting the timing of the date/advance control IC, and a shooting L, CD 4, and monitor Lan.
Mode selector switch 1 for cyclically switching the display contents of 5 to the year, month, date, February, date, time, 9th, hour, minute, and to a stand-alone mode such as prohibition of photography.
0 is provided, and the display mode of the LCD 4 and monitor L (D5) is selected with the mode changeover switch 10, and the exposure time corresponding to the film sensitivity is selected with the time changeover switch 8. When the shirt release operation is performed, the shooting control rc12 on the camera body side
The date direction sending control IC 3 outputs a signal X as shown in FIG. 2, which gives the date direction sending timing before or after the shirt release. A predetermined delay time t from the falling edge. Afterwards, a signal Y giving a predetermined photographing time tI is outputted, and the photographing lamp 6 is turned on for a time tL, whereby the date is advanced with proper exposure.

The date forwarding control IC 3 has a configuration as shown in FIG. The display switches to display the film sensitivity or the corresponding exposure time. This allows the photographing time to be confirmed. Note that in FIG. 3, the same reference numerals as in FIGS. 1 and 2 indicate the same functional elements.

Here, the camera body 11 is provided with a power source 13 separate from the power source battery 7 provided on the camera back cover 1, and the photographing control 1012 on the camera body 1 side is operated by the power source 13. The reason why the battery 7 is provided in the date sending device is that it is necessary to keep the clock running at all times as a power supply, so that even if the battery on the camera body side is replaced, there is no need to correct and reset the time measurement for the date 1 part. It is something. However, using a separate power supply requires extra space and cost.
The battery check circuit could no longer be shared, making it difficult to send and receive signals between the control IC on the main body side and the control IC for sending the date.

Furthermore, the monitor LCD 5 is used to display the date, and is provided on the camera back cover l so that it can be monitored from the back. Although it has a spacious area that allows various displays other than information to be displayed, it is limited to the same display as the above-mentioned imprint. In addition, the date imprint control IC uses a crystal oscillator to display the date, and although it is always in operation, it does not have any other functions.

[Purpose of the invention]

The present invention is equipped with a date imprinting device in which the main body control IC and the date imprinting IC share a common power source, and an eight-touch check is also displayed as another function display on the date display section provided on the camera back cover. The purpose is to provide cameras.

[Structure of the invention]

The present invention includes a main body control IC that controls a camera main body;
The date imprint control IC that controls date imprinting is a camera that can be driven by a common power supply, and the date imprint control IC performs a battery check and also displays a warning accompanying the battery check. The present invention provides a camera equipped with a date imprinting device characterized by the following features.

〔Example〕

First, before explaining the present invention, an example of a circuit including a control IC used for the main body or date imprinting, and a battery that performs the battery check of the present invention using the power supply for main body loads such as strobe light emission and motor drive will be explained. Shown in FIG. 4 and FIG. 5.

In FIG. 4, the main body control IC 41a and the date imprint control IC 42a are driven by a battery 43a of the same power source. The battery 43a is a 6V power supply, - the blade body control rc41a
Since both the date imprint control IC 42a and the date imprint control IC 42a are driven by 3V, a regulator 44 is provided between them to transform the voltage. The main body control IC 41a consumes a current of 100 pA each time it is used, and the date imprint control IC 42a always consumes a current of 2 to 3 gA. Further, main body loads 45a such as strobe light and motor drive are driven by a battery 43a which is the same power source. The main body load 45a consumes a current of 100 mA per shooting time, but since the battery 43a has a large capacity, it can be used for a long time without replacing the battery. Therefore, the present invention can be applied to the date imprinting control IC 42a or the date imprinting control IC.
A battery check circuit externally attached to the battery 42a performs a battery check on the battery 43a, and also displays a warning. That is, the battery check circuit 8
0a is the reference voltage from the regulator 44a and the battery 43
The date imprint control lG42b compares the terminal voltage of the battery and performs a battery check, and when the terminal voltage of the battery falls below a predetermined value, sends the signal to the display means 81a to display a warning.

Also, in the circuit diagram shown in Figure 5, the main body control [:41
b and the date imprint control IC 42b are driven by the same 3V power supply battery 43b. The battery 43b is a small capacity button type battery, but since both the main body control IC 41b and the date imprint control IC 42b consume a small amount of current, the battery 43b can be used for a long period of time.

On the other hand, the main body load 45b for strobe light emission, motor drive, etc. is driven by a separate battery 43c, which is a 3V power source. The battery 43c is a large capacity battery, and uses a AA 37S alkaline battery or the like. In this case, even if the battery 43c is replaced, there is no need to reset the date information in the date sending device. In such a circuit, the present invention performs a battery check inside the date imprint control IC 42b or externally attached to the date imprint control IC 42b. In this embodiment, the reference voltage of the battery check circuit 8ob is obtained from the regulator 44b which generates a constant voltage, and the warning display is performed by the display means 81b. In addition, when using a power source and a separate battery 43b as the power source for the main body control IC 41b and the date imprint 1 control IC 42b in this way, the power is directly supplied from this battery without passing through the constant voltage circuit 44b. A reference voltage may also be used.

FIG. 6 shows a puff pastry check circuit 6o provided inside or externally attached to the date imprint control IC 42b, and a battery 43a.
Alternatively, the terminal voltage vg of 43c is compared with a reference voltage vREF separately provided in advance by a comparison circuit GOMP, and when the battery is insufficient or exhausted, the image control IC 42 displays a warning by the monitor LCI 12a described later.

Here, the previous reference voltage v8! , is separately obtained from a lithium battery used as a reference voltage power supply, and in the circuit shown in FIG. 5, the reference 1 voltage power supply when performing a battery check of battery 43c may be battery 43b.

FIG. 7 shows an example of a control and functional block diagram of the present invention, in which the camera body unit 11a has a main body control circuit including control circuits for photometry, shutter, film feeding, etc. 41a, and the camera back cover 1a has a crystal oscillator 2a inside, a date imprint control IC 42a, an imprint LCD 1a facing the back of the film, and a monitor L (D2a) visible through the window of the camera back cover 1a. There is also an imprinting lamp 6a that irradiates light onto the back surface of the film through an embedded LCD 1a.The main body control IC 41 and the date imprinting control IC 42 are driven by a common power source 43.

In addition to displaying dates such as the year, month, and day, the monitor LCD 2a also displays
Film sensitivity ISO display, film counter display, D
Displays such as X non-DX display, autoload completion display, autorewind completion display, etc. can be performed.

In the present invention, the date control IC 42 is the date control IC 4
A battery check circuit 60 provided inside or outside the power source 43 is used to check the battery of the power source 43, and a warning signal thereof is displayed on the monitor LCD 2a.

Since the date control IC 42 is always in operation, the battery can be checked regardless of the operation or condition of the camera body.
The monitor LCQ2a can display a warning for a long time.

As a first display example of battery check, monitor L
A battery check display is performed by blinking (2Hz) the date display and film counter display on the CD2a. Once the battery check display is latched, it remains in this state until the battery is replaced and the all clear input is input. hold. Photographing is prohibited during the battery check display, and the photographing lamp 8a does not light up.

Further, as a second display embodiment of the battery check, a battery mark indicating an insufficient or exhausted battery can be flashed on the monitor LCD 2a as shown in FIG. In this case, the above battery mark can be displayed in place of the date display or film counter display, or it can be displayed on a display other than the date display or film counter display. It is possible to continue blinking until replacement is carried out, or it is possible to use a timer connected to the date imprint control IC 42 to decrement the light for a certain period of time.

〔Effect of the invention〕

The date display section provided on the camera back cover can be displayed over a considerable planar area of the camera back cover.

Furthermore, the date imprint control IC checks the battery of the drive power source and displays this on the date display section, so there is no need to transmit battery check information. Furthermore, since the date control IC is always in operation, the battery check display can be displayed in any form or for any length of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic circuit diagram of a conventional date imprinting device, FIG. 2 is an imprinting time chart in the circuit of FIG. 1, and FIG. 3 is a functional block diagram thereof. 4 and 5 are circuit diagrams to which the present invention is applied, FIG. 6 shows a battery check circuit, FIG. 7 shows a control and functional block diagram of the present invention, and FIG. 8 shows a battery check circuit. A display example is shown. 1.1a...Camera back cover 11, lla...Camera body unit 41...
...Body control IC42...Date imprint control IC. 43...Battery 60...Battery check circuit agent Patent attorney Field 1) Parent-in-law Fig. 1 Fig. 2 f, otL Fig. 3 12 B'/10 6 Fig. 4 41a 42,1 Figure 5 Figure 6

Claims (2)

[Claims] (1) A camera in which the main body control IC that controls the camera body and the date imprint control IC that controls date imprinting can be driven by a common power source, and the battery check is performed by the date imprinting control IC. A camera equipped with a date imprinting device, characterized in that a warning display accompanying a battery check is also displayed. (2) A camera equipped with a date imprinting device according to claim 1, wherein the warning display continues until the power source is replaced.