JPS6113237A - Camera provided with date transfer device - Google Patents

Abstract

PURPOSE:To display date independently of the operation of a camera body by checking a battery with an IC which controls the camera body and displaying a warning accompanied with battery check by a date transfer control IC. CONSTITUTION:A camera body load such as a strobe or the like is driven by a power source battery of 6V, and 3V power source voltage is generated by an adjuster 44a to drive a camera body control IC 41a and a date transfer control IC 42a. Several 100s mA are flowed to a battery 43a at the photographing time, and several 100s muA are flowed to the IC 41a when it is used, and 2-3muA are always flowed to the IC 42a to continue time counting. A battery check circuit 60a is connected between the + terminal of the power source battery 43a and the output terminal of the adjuster 44a to check the battery; and if the battery capacity is lower than a reference value, the IC 41a detects this state and sends a signal to the IC 42a to display a warning on a display means 61a. Thus, it is easy to display the date on the rear cover of the camera, and the date is always displayed.

Description

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

[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 was done by setting. That is, the camera back cover 1 has a crystal oscillator 2 inside and a date direction control TC.
3, and use a liquid crystal display facing the back of the film to make a photo.
c: D 4, a monitor l that can be seen from the outside through the window of the camera back cover 1, a CD 5, a photography lamp 6 that irradiates light onto the back side of the film through the photography LCD 4, and a power supply battery 7.
There is also a shooting time selector switch 8 that can be pressed from the outside to switch the shooting time cyclically from 15OIO0, 200, 400 depending on the film sensitivity, and a date mode switch. The clock correction switch 9 is used to correct the G timekeeping, and the display contents on the photo LCD 4 and monitor LCD 5 are changed to year, month, day, January, date and time.

A mode changeover switch 10 is provided for cyclically switching between the date, time, minute, and photography prohibited, and the mode changeover switch 10 allows the user to switch between the LCD 4 and the monitor LC:D.
When the display mode 5 is selected, the exposure time corresponding to the film sensitivity is selected using the exposure time changeover switch 8, and the shirt taller is operated, the shooting control IC 12 on the camera body 11 side switches the shooting control IC 12 to the shirt tallerise. A signal X as shown in FIG. 2 which gives the timing of forward or backward forwarding of the date direction is outputted to the date direction forwarding control IC3, and the date direction forwarding control IC3 starts at a predetermined time from the falling edge of the signal X in the illustrated example. After the delay time to, a signal Y giving a predetermined photographing time tL is output, and the photographing lamp 6 is turned on for the time tL,
This allowed the date to be sent with appropriate exposure. The date control IC 3 has a configuration as shown in FIG. The display is switched to display the film sensitivity or the nasal passage time corresponding thereto.

This allows the photographing time to be confirmed. In addition, the third
In the figure, the same reference numerals as in FIGS. 1 and 2 indicate the same functional elements.

The monitor LCD 5 displays the date. The monitor LCD 5 is provided on the camera back cover l and can be monitored from the back. Conventionally, the date, date, hour, minute, etc. can be displayed from the area of the camera back cover. Despite having ample area to display various types of information other than date information, the display was limited to the same display as the above-mentioned imprint. Furthermore, 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]

SUMMARY OF THE INVENTION An object of the present invention is to provide a camera equipped with a date imprinting device that also displays other functions on a date display section provided on the camera back cover.

[Structure of the invention]

The present invention provides a date and time camera in which a battery check is performed by a main body control IC that controls the camera body, and a warning display accompanying the battery check is performed by a date imprint control IC that controls date imprinting. The present invention provides a camera equipped with an embedded device.

〔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. Figure 4.

It is shown in FIG.

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, while the main body control IC 41a
Since both the date imprint control IC 42a and the date imprint control IC 42a are driven at 3V, a regulator 44 that generates a constant voltage of 3V is installed between them to transform the voltage. date imprint control IC42
A always consumes a current of 2 to 3 #LA. Further, main body loads 45a such as strobe light emission 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.6For example, in such a circuit, Therefore, the present invention is based on this battery 4.
3a, the battery check is performed. That is, the battery check circuit Boa compares the reference voltage from the regulator 44a and the terminal voltage of the battery 43a, and performs a battery check. is sent to the date imprint control IC 42b, and the display means 8 is sent to the date imprint control IC 42b.
1a displays a warning.

Also, in the circuit diagram shown in Figure 5, the main body control IC41
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 an AA 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 is applicable to this battery 43b.
and/or performs a battery check of 43c. In this embodiment, battery check circuit 60
The voltage is obtained from the regulator 44b which generates the reference voltage b, and the warning display is performed by the display means 81b.

In this way, as a power source for the main body control IC 41b and the date imprint control IC 42b, a power source and a separate battery 43 are used.
When using battery 44b, the reference voltage may be taken directly from this battery without passing through the constant voltage circuit 44b.

FIG. 6 shows a battery check circuit θ0 provided within or externally to the main body control 1041. Battery 43a or 43
The terminal voltage ■8 of c is a reference voltage vRff separately provided in advance.
, and is compared by the comparison circuit GOMP, and when the battery is insufficient or exhausted, the date imprint control 1. A warning signal (IBG-1) is issued to C42.

FIG. 7 shows an example of a control and functional block diagram of the present invention, in which a main body control IC 41a including a control circuit is mounted on the camera main body 22 hlla side, and a crystal crystal is mounted inside the camera back cover 1a. A vibrator 2a, a date imprint control IC 42c,
A reflection LCD 1a facing the back side of the film, a monitor LCD 2a visible from the outside through the window of the camera back cover 1a,
There is a projection lamp 6a that irradiates light onto the back surface of the film through the projection LCD 1a. The main body control 1041 and date imprint control IC 42 are driven by a common power source.

In addition to displaying dates such as year, month, and day, the monitor LCD 2a also displays
Displays such as film sensitivity ISO display, counter display, DX non-DX display, autoload completion display, autorewind completion display, etc. can be performed. In the present invention, a warning signal due to the battery check is sent from the main body control IC 41 to the date imprint control IC 42.

Since the date control IC 42 is always in an operating state, the monitor L (D2a) can display information for a long time when it receives the warning signal uBc=n regardless of the operation of the camera body.

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

In addition, as a second display example of the battery check, the battery mark of the insufficient or exhausted battery can be flashed on the monitor L (D2a as shown in Fig. 8) on the liquid crystal display.In this case, the above battery mark It 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, and the puff pastry check display will continue until the battery is replaced. It is also possible to make it blink or to make it blink for a certain period of time using a timer connected to the date imprint control H:42c.

〔Effect of the invention〕

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

In addition, since the date imprint control IC is always in an operating state, the date display can be displayed regardless of the operation of the camera body.In the present invention, the battery check display is performed using the date display section provided on the camera back cover. To display the used
It was advantageous in terms of cost, and the display format and display time could be freely chosen.

[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 1 functional block diagram of the present invention, and FIG. 8 shows a battery check circuit. A display example is shown. 1, la...Camera back cover 11, lla...Camera body unit 41...
...Body control IC42...Date imprint control ■c43...Battery 60...Battery check circuit agent Patent attorney Field 1) Parent-in-law Figure 1 2 figure 1, 7ri figure 3 12 g Q 10 6 figure 4

Claims (3)

[Claims] (1) A date imprint characterized in that a battery check is performed by a main body control IC that controls the camera body, and a warning display accompanying the battery check is performed by a date imprint control IC that controls date imprinting. Camera with equipment. (2) A camera equipped with a date imprinting device according to claim 1, wherein the warning display continues until the power source is replaced. (3) A camera equipped with a date photographing device according to claim 1, wherein the warning display is performed only for a certain period of time after a start signal is issued from the main body control IC.