JPH06186627A - Camera with data display function - Google Patents

Abstract

PURPOSE:To confirm the decreasing state of the number of photographing frames and the finish of rewinding at the time of rewinding a film even when a lens barrel is at a collapsible mounting position. CONSTITUTION:When the rewinding processing of the film is instructed, the lens barrel is driven to the collapsible mounting position (S602). When it is detected that the lens barrel arrives at the collapsible mounting position (S603), the rewinding of the film is started (S605). During the rewinding action, the display of the photographing frames of the film (counter) is decreased (S606). When the rewinding is finished, a timer as long as 6 seconds is started (S609). When it is detected that the back cover of a camera main body is opened in order to take out the film (S610) or it is confirmed that 6 seconds elapses (S611), the display of a liquid crystal display part is switched to the display of date (date display) from the display of the number of photographing frames (counter display) (S612).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera with a date display function having a date display function.

[0002]

2. Description of the Related Art Recently, electronic cameras have been increasingly digitized, and photographing is performed by electronic control. Further, for example, a display unit such as an LCD is provided, and various information regarding photographing is displayed here.

The information to be displayed includes a date (date) and the number of photographed frames (count value). The date is necessary, for example, for imprinting the shooting date and time on the film. The number of frames to be shot is necessary for the user to confirm the number of frames currently shot.

Conventionally, the date and the number of frames taken have been simultaneously displayed on the LCD. However, in this case, there is a possibility that the display of part of the date may be erroneously recognized as the number of shooting frames. So, when one is displayed,
The other can be hidden. As a result, the LCD panel can be downsized, the number of LCD display segments can be saved, and the cost can be reduced.

Confirmation of the number of frames to be photographed is necessary during the photographing operation. On the other hand, the date does not necessarily have to be displayed during the shooting operation. Because of this, when taking a picture, the lens barrel is extended,
When shooting is not performed, the lens barrel is lowered (it is in the retracted state). Therefore, when the lens barrel is in the retracted state, the date is displayed on the LCD, and when the lens barrel is in the extended state, the number of frames to be shot is set. It is possible to display it.

[0006]

However, in a camera in which the lens barrel is retracted in order to protect the lens barrel when the film is rewound into the cartridge after the last frame of the film has been photographed, the mirror is retracted like this. If the date is displayed on the LCD instead of the number of frames taken when the barrel is in the collapsed state, the process of sequentially decrementing the number of frames taken with the film rewinding and the completion of rewinding will be performed by the user. There was a problem that could not be confirmed.

The present invention has been made in view of the above circumstances, and it is possible to confirm the process of decrementing the number of frames taken and the completion of rewinding when the film is rewound. is there.

[0008]

A camera with a date display function according to a first aspect of the present invention is a liquid crystal display as a display means for switching and displaying the date or the number of frames photographed on a film of a subject through a photographing lens. Section 4, a feeding circuit 9 as a rewinding means for rewinding the film to the cartridge, and a signal for rewinding the film while displaying the number of frames to be photographed on the liquid crystal display section 4 before rewinding the film by the feeding circuit 9. Is output, the microcomputer 1 is provided as a control unit that switches the display of the liquid crystal display unit 4 from the number of frames to be taken to the date.

In the camera with a date display function according to a second aspect of the present invention, the microcomputer 1 has the liquid crystal display section 4 when a predetermined time set in advance has passed after the rewinding of the film by the feeding circuit 9 is completed. The display of is switched from the number of shot frames to the date.

[0010]

In the camera with a date display function according to the first aspect, after the film rewinding is started by the feeding circuit 9, the display of the liquid crystal display unit 4 is switched from the number of frames to be taken to the date. Therefore, during the film rewinding operation, it is possible to confirm the decrement of the number of frames taken and the completion of the rewinding.

In the camera with date display function according to the present invention, the display is switched from the number of frames to the date when a predetermined time has elapsed after the film has been rewound into the cartridge. Be seen. Therefore, it is possible to surely confirm the decrement of the number of frames taken during film rewinding and the completion of rewinding.

[0012]

1 is a block diagram showing the configuration of an embodiment of a camera with a date display function of the present invention.

In FIG. 1, a microcomputer 1 which controls the control operation of the entire camera includes switches such as a main switch (MS) for starting the camera operation.
W) 21, a flash switch (SBS) 22 for selecting a flash shooting mode, and a mode switch (MOS) 23 for selecting a self-timer shooting mode.
, A half-press switch (half-press SW) 24 that is turned on by half-pressing the release button, a release switch (release SW) 25 that is turned on by fully-pressing the release button, and a lens barrel position for detecting the position of the lens barrel. A detection switch (lens barrel position detection SW) 26, a battery cover switch (power supply cover SW) 27 for identifying battery loading, a date transfer switch 28 for transferring a date on a film, and a camera body. A back cover switch 29, which is turned on and off in conjunction with the opening and closing of the back cover that is opened and closed when a film is loaded, is connected. All of the switches 21 to 29 are momentary switches except the lens barrel position detection switch 26 and the back cover switch 29, and are switches that automatically return when the user releases his hand.

The microcomputer 1 includes a liquid crystal display unit 4, a lens barrel drive circuit 5, a photometry circuit 7, a distance measurement circuit 8,
Feeding circuit 9, date imprinting circuit 10, lens driving circuit 1
1, a shutter drive circuit 12, a flash drive circuit 13, and a film frame advance detection circuit 14 are connected.

The liquid crystal display (LCD) 4 is arranged on the camera body (main body), and in the case of setting the photographing mode, the date imprinting mode, etc. according to the output signal from the microcomputer 1, Display the required information. The lens barrel drive circuit 5 is connected to a motor 6 for driving a lens barrel (not shown) that accommodates the taking lens, and drives the lens barrel at a necessary timing according to an instruction from the microcomputer 1. The photometric circuit 7 measures the brightness of the subject at a necessary timing according to an instruction from the microcomputer 1 and transfers it to the microcomputer 1. The distance measuring circuit 8 measures the distance to the subject at a necessary timing according to an instruction from the microcomputer 1 and transfers the distance measuring result to the microcomputer 1. The feeding circuit 9 winds the film by one frame in accordance with an instruction from the microcomputer 1 and rewinds the film on a cartridge (not shown). The date imprinting circuit 10 is a microcomputer 1
, The data in the microcomputer 1 is imprinted on the film surface.

The lens drive circuit 11 drives the lens in response to a command from the microcomputer 1. The shutter drive circuit 12 drives a shutter (not shown) in response to a command from the microcomputer 1. The strobe drive circuit 13 drives a strobe (not shown) in response to a command from the microcomputer 1. The film frame advance detection circuit 14 indicates that the film has been advanced one frame, or
Detects the completion of rewinding the film to the cartridge.

Further, the microcomputer 1, the liquid crystal display unit (LCD) 4, the lens barrel drive circuit 5, the photometry circuit 7, the distance measurement circuit 8, the feeding circuit 9, the date photographing circuit 10, the lens drive circuit 11, and the shutter drive. Circuit 12, strobe drive circuit 1
3. A battery 31 is connected to the film frame advance detection circuit 14, and power is supplied.

The microcomputer 1 is a one-chip microcomputer, has a ROM 2 and a RAM 3 built-in, and controls the entire sequence of the camera. Further, it also has a function of driving the liquid crystal display unit 4.

The operation of this embodiment will be described below, but it is assumed that the following are preconditions for the operation.

In this embodiment, the strobe mode is
There are five types: automatic light emission, red-eye reduction, light emission inhibition, forced light emission, and slow sync.

Further, in the date mode, "date",
It is assumed that there are five modes of “month / day / year”, “day / month / year”, “date / time / minute”, and “off”. Also, there are a selection mode and a correction mode for setting the date mode. In the selection mode, any one of the above five date modes is selected.
In correction mode, the clock data (year, month, day,
Correct the hour, minute) time setting.

In the present embodiment, the display of the date such as the year, month and day may be simply referred to as "date display", and the display of the number of filmed frames of the film may be simply referred to as "counter display".

Under the above prerequisites, the flow of the entire operation of this embodiment will be described.

FIG. 2 is a flow chart for explaining the overall operation of the embodiment of FIG. 1, and the flow chart of FIG. 2 will be described below. In this flowchart, the meaning of the steps on the flowchart is represented by the symbol “S”.

The process starts from S100. S10
When the battery is attached and the battery cover switch 27 is turned on in No. 1, the process branches to S108 to perform the date initial setting process. The date initial setting process will be described later.

At S102, the main switch (MS
When the W) 21 is detected to be turned on, the process branches to S109 to execute the main switch process (MSW process).

After the main switch processing is completed, or when the main switch 21 is not turned on, the process returns to the switch state confirmation loop of S103 to S106, and the main switch 21, the strobe switch 22, the mode switch 23, and the half-press switch 24. 1 is turned on, or the lens barrel position detection switch 26 continues to check whether the lens barrel is in the retracted position. In S106,
When it is confirmed that the lens barrel is in the retracted position, the process proceeds to S107, and the process ends.

After the above processing is completed, the main switch 21
When the main switch 21 is turned on,
The process is restarted from 100.

In S103, the flash switch 22
When it is detected that the switch is ON, the process branches to S110 to call the flash switch process. When the mode switch 23 is detected to be turned on in S104, the process branches to S111 to call the mode switch process. When it is detected in S105 that the half-push switch 24 is turned on, the process branches to S112 to call the photographing process.

The main switch process, strobe switch process, mode switch process, and photographing process will be described in detail later, but when these processes are completed, S102 to S1.
It returns to the loop of 06 and continues to confirm that each switch is turned on again.

Next, the processing of each subroutine in the flowchart of FIG. 2 will be described.

FIG. 3 shows S10 in the flow chart of FIG.
8 is a flowchart showing a date initial setting process of No. 8,
The flowchart will be described below.

When the change of the battery cover switch 27 is confirmed in S101 of FIG. 2, the process proceeds to S108 and the date initial setting process is called.

The date initial setting process starts from S120 of FIG. 3, and first in S121, the date imprinting mode is turned off. In S122, the date calendar is set to a predetermined date (in this example, January 1, 1993).
Initialize to (day). In S123, the clock is initialized to a predetermined time (0:00 in this example), and S12 is set.
At 4, the clock starts.

In S125, the liquid crystal display unit 4 is turned off, and the process returns from S126 to the flowchart of FIG.

FIG. 4 shows S10 in the flow chart of FIG.
9 is a flowchart showing a main switch process of No. 9,
The flowchart will be described below.

When it is confirmed in S102 of FIG. 2 that the main switch 21 is turned on, the process proceeds to S109 to call the main switch process shown in FIG.

The main switch process starts from S200, and first in S201, the state of the lens barrel position detection switch 26 is detected to determine whether or not the lens barrel is in the retracted position. When the lens barrel is in the retracted position, the process proceeds to S202, and the date correction mode flag is cleared. Next, S20
At 3, the microcomputer 1 drives the motor 6 through the lens barrel drive circuit 5 to extend the lens barrel to the photographing position, and S2
In step 04, the liquid crystal display unit 4 displays the shooting mode (see FIG. 12).

In S205, it is confirmed whether or not the date imprinting mode is off. If it is off, the print (PRINT) mark on the liquid crystal display unit 4 is turned off in S206, and if it is on, the print (PRINT) mark is turned on in S207. It lights up (FIG. 12). Then, it progresses to S208.

When it is determined in S201 that the lens barrel is not in the retracted position, the process proceeds to S209 and in S209.
The lens barrel drive circuit 5 drives the motor 6 to retract the lens barrel to the retracted position. Next, in S210, the date imprinting data is displayed on the liquid crystal display unit 4 (FIGS. 11 and 1).
In 3, 3 (year) 10 (month) (M) 25 (sun)
Is displayed). Then, it transfers to S208.

In S208, the process waits until the main switch 21 is turned off. When the main switch 21 is turned off, the process returns from S211 to the flowchart of FIG.

FIG. 5 shows S11 in the flow chart of FIG.
It is a flowchart showing the flash switch process of 0, and this flowchart will be described below.

When it is confirmed in S103 of FIG. 2 that the strobe switch 22 is turned on, the process proceeds to S110, and the strobe switch process shown in FIG. 5 is called.

The strobe switch process starts from S300, and first in S301, the state of the lens barrel position detection switch 26 is detected to determine whether or not the lens barrel is in the retracted position.

If the lens barrel is not in the retracted position, the flow advances to S310 to switch the SB mode (strobe mode). S
There are five types of B mode: automatic light emission mode, red-eye reduction mode, light emission prohibition mode, forced light emission mode, and slow sync mode.
When in the red-eye reduction mode, it is in the flash off mode, when it is in the flash off mode, it is in the flash mode, when it is in the flash mode, it is in slow sync, and when it is in slow sync, it is in the auto flash mode, Switch each (Fig. 1
5). After that, the process proceeds to S311, and waits for the flash switch 22 to turn off. When the flash switch 22 is turned off, the process returns from S309 to the flowchart of FIG.

If the lens barrel is in the retracted position in S301, the process proceeds to S302. In S302, it is confirmed whether the date correction mode has already been entered.

The fact that the date correction mode has not been entered is a selection mode, and the process proceeds to S303 in which the flag A is set (set to "1") and the flash switch 22 is pressed for the first time. Be identifiable.

In step S304, a 2-second timer (built into the microcomputer 1) is started to check whether the strobe switch 22 is kept on.
After the 2-second timer is started, in S305, it is determined whether or not the strobe switch 22 is off.
If the ON state continues, the process proceeds to step S317.
5, S306 loop around.

When the timer times out in S306 (when the strobe switch 22 is turned on for 2 seconds or more), a correction mode flag is set in S307 (this flag is determined when the process proceeds to S302 again later). ). The date correction mode is entered while the correction mode flag is set. After that, the process proceeds to S308, and the left part of the liquid crystal display unit 4 is displayed blinking. After that, the process returns from S309 to the flowchart of FIG.

The date display on the liquid crystal display unit 4 is
It is displayed in three blocks, the middle part and the right part, and each block is displayed in a 2-digit decimal number (see FIG. 1).
1, see FIG. 13). The correction is performed in the order of the left part, the middle part, and the right part. When the correction mode is entered, the left part first flashes to indicate that the left part can be modified. For example, when the selection mode is "date", "year" is displayed on the left side, "month" is displayed on the middle part, and "day" is displayed on the right side. When the correction mode is entered, first, the year "Year"("93" in the case of the examples of FIGS. 11 and 13) on the left is flashed to indicate that the year can be corrected.

If it is determined in S302 that the correction mode has already been entered, the process proceeds to S312. In S312, it is confirmed whether the right part (“25” in FIGS. 11 and 13) is blinking. The fact that the right part is blinking means that all corrections have already been completed, and S3
The blinking display of the liquid crystal display unit 4 is ended in 14 and the correction mode flag is released in S315. This exits the correction mode. Then, in S316, the flash switch 22 is waited to be turned off, and when the flash switch 22 is turned off, S30
The procedure returns from 9 to the flowchart of FIG.

If the right portion is not blinking in S312, the correction digit (flashing position) is shifted. If the left part (“'93” in FIGS. 11 and 13) is blinking, it is in the middle part (“ ^M 10” in FIGS. 11 and 13), and if the middle part is blinking, the right part (FIG. 11,
It switches to "25" of FIG. After that, in S316, the strobe switch 22 is turned off, and when the strobe switch 22 is turned off, the process returns from S309 to the flowchart of FIG.

In S305, the flash switch 22
Is turned off (when the strobe switch 22 is turned on once and then turned off before two seconds elapse), the process proceeds to step S317 in the flowchart of FIG. 6, and in step S317, it is determined whether the flag A is “0” or “1”. If it is determined to be "0" (if the flash switch 22 is turned on again for 2 seconds, the flag A is reset to "0" in S321 described later), S3
Start the 5 second timer at 18, S320, S32
3, the loop of S324 is entered, and the strobe switch 22 is on standby.

If the flag A is "1" in S317 (the strobe switch 22 is turned on / off only once), the 2-second timer is started in S319, and the loop of S320, S323, and S324 is executed. It enters and waits for the next strobe switch 22 to be turned on.

In the loop of S320, S323 and S324, the strobe switch 22 is activated within 5 seconds or 2 seconds.
When is turned on again, the process proceeds to S321, the flag A is set to "0", and the date mode switching process is performed in S322.

The date mode is "date", "month year",
There are 5 modes, "Sun / Month / Year", "Date and time", and "Off".
When "Date" is "Month Year", when "Month Year" is "Sun Month", when "Month Year" is "Date and Time", when "Date and Time" is Switch to "OFF" respectively (Fig. 1
6). After that, the process returns to S304 to start the 2-second timer (timer for determining whether to enter the correction mode). Hereinafter, the process proceeds to S305 and returns to the above-described operation from S305.

In the loop of S320, S323 and S324, when other switches (main switch 21 etc.) are turned on in S323, the process returns from S325 to the flowchart of FIG. In step S324, the flash switch 22 is not pressed for 5 seconds (S31
When the timer time of 8) or 2 seconds (S319) has elapsed, the process returns from S325 to the flowchart of FIG.

The timer is shortened to 2 seconds in S319, whereas it is lengthened to 5 seconds in S318 for the following reason. That is, when the flag A is "1" (when the strobe switch 22 has been turned on only once), the strobe switch 22 (or another switch) is turned on again to allow the user to change the mode. This is to judge whether or not the user has the intention to switch (If the mode is switched by one operation, the mode is switched immediately when the switch is inadvertently operated. So, in order to prevent this, it is necessary to perform the operation twice in 2 seconds to switch the mode.) However, since it does not require a long time to confirm this intention, a short time of 2 seconds is required. Is set. On the other hand, when the flag A is "0", it is time to switch the date mode, and therefore it is necessary to give the user a longer consideration time.

FIG. 7 shows S11 in the flow chart of FIG.
It is a flow chart which shows the mode switch processing of No. 1,
The flowchart will be described below.

When it is confirmed that the mode switch 23 is turned on also in S104 of FIG. 2, the process proceeds to S111, and the mode switch process shown in FIG. 7 is called.

The mode switch process starts from S400, and first in S401, the state of the lens barrel position detection switch 26 is read to confirm whether or not the lens barrel is in the retracted position. When the lens barrel is not in the retracted position, the process proceeds to S406 and the shooting mode is switched.

There are four shooting modes: normal shooting (cancellation) mode, forced ∞ mode, single self mode, and double self mode, and the modes are switched in sequence when the mode switch 23 is turned on (see FIG. 17). In forced mode, when you press the release button all the way down,
The shutter is operated (opened) until the full press is released.
In the single self mode, the shutter is operated when a certain time has elapsed since the release button was fully pressed. In the double self mode, the shutter is operated when a fixed time twice as long as that in the single self mode has elapsed. In the release mode, the shutter is operated from when the release button is fully pressed until a command corresponding to the photometric result is issued.

Then, the process proceeds from S406 to S407 and waits for the mode switch 23 to turn off. When the mode switch 23 is turned off, the process returns from S405 to the flowchart of FIG.

When it is determined in S401 that the lens barrel is in the retracted position, the process proceeds to S402. In S402, it is confirmed whether or not the correction mode has already been entered (when the strobe switch 22 is turned on for 2 seconds or more in the retracted state, S3 in FIG.
The correction mode is set in 07, and after the correction on the right side is finished, S3
The correction mode is canceled at 15.) When the correction mode is not entered, the process proceeds to S404 and waits for the mode switch 23 to be turned off. When the mode switch 23 is turned off, S40
Returning to the flowchart of FIG.

If the correction mode is entered in S402, the clock data is shifted in S403. Left part, middle part,
1 in the data (“year”, “month”, “day”, “hour” or “minute”) of the block that is flashing at that time in the right part
(Or -1) is added. For example, when the display mode is year, month, day and the left "year" is set to 1994 and is blinking, the year "94" is switched to "95" and blinking is displayed. Then, in S404, it is confirmed that the mode switch 23 is off, and the process returns from S405 to the flowchart of FIG.

Next, the details of the shooting processing subroutine of S112 of FIG. 2 will be described with reference to the flowcharts of FIGS. This process starts from S500, and in S501, it is determined whether or not the lens barrel housing the taking lens is in the retracted position. When the lens barrel is in the retracted position, the lens barrel position detection switch 26 is on. At this time, shooting is prohibited. Therefore, at this time, the process proceeds to S521, the photographing process is ended, and the process returns to the flowchart of FIG.

When it is determined in S501 that the lens barrel position detection switch 26 is off (when the lens barrel is in the extended position), the process proceeds to S502, and the display on the liquid crystal display unit 4 is shown in FIG. The state in which the number of frames to be shot is displayed is switched to the state in which the date shown in FIG. 11 is displayed.

Next, in S503, the photometric processing is executed. That is, the microcomputer 1 controls the photometric circuit 7 to execute the photometric processing. At this time, the photometric circuit 7
Calculates the brightness of the subject from the amount of light input to the built-in light receiving element, and calculates the opening time of the shutter (not shown). At the same time, it is determined whether or not the brightness is low, and whether or not stroboscopic light emission is necessary. Now, when the automatic light emission mode is set, it is determined whether or not the strobe is caused to emit light according to the brightness. When the light emission prohibition mode is set, strobe light emission is prohibited regardless of the brightness. When the forced light emission mode is set, the flash is emitted regardless of the brightness.

Next, in S504, distance measurement processing is executed. At this time, the microcomputer 1 controls the distance measuring circuit 8 to execute the distance measuring process. The distance measuring result is output from the distance measuring circuit 8 to the microcomputer 1.

In S505, it is determined whether or not it is determined in S503 that strobe light emission is required. When it is determined that the strobe light emission is necessary, the process proceeds to S522, and it is determined whether or not the charging of the strobe light is completed. If charging is not completed, strobe light cannot be emitted. Therefore, at this time, the process proceeds to S523 and waits until the halfway press switch 24 is turned off (the release button is opened),
When the half-push switch 24 is turned off, the process proceeds to S524, and the display on the liquid crystal display unit 4 is switched from the date display state shown in FIG. 11 to the shot frame number display state shown in FIG. 12, and the shooting process ends.

When the charging of the strobe has already been completed, the process proceeds from S522 to S506. Even if it is determined in S505 that the strobe light need not be emitted, the process proceeds to S506. In S506, it is determined whether the release switch 25 has been turned on.

When the release switch 25 is off, the routine proceeds to S525, where it is judged if the half-push switch 24 is on. When the half-push switch 24 is in the ON state, the process returns to S506, and a process of determining whether or not the release switch 25 is ON is performed.

That is, by pressing a release button (not shown) halfway, after S502, S506 and S
The process of 525 is repeated. As described above, in this state, the date display shown in FIG. 11 is made on the liquid crystal display unit 4 by the process of S502. When the lens barrel is extended, the process of S204 in FIG.
The display of the number of frames taken is shown on the liquid crystal display unit 4 as shown in FIG. 12, but the user changes the display to the date display as shown in FIG. 11 by pressing the release button halfway. be able to. As a result, the user can confirm the date on which the imprinting is performed.

After the confirmation as described above, if the half-push switch 24 is turned off (the half-push state of the release button is released), the process proceeds to S526, and the liquid crystal display unit 4 displays the date display shown in FIG. The state is switched to the display state of the number of captured frames shown in FIG. Then, the photographing process is ended.

In S506, the release switch 25
When it is determined that is turned on, the process proceeds to S507, and the display of the liquid crystal display unit 4 is switched from the date display state shown in FIG. 11 to the shooting frame number display state shown in FIG.

Next, in S508, it is determined whether or not the self mode is set. If the self mode is set, the process proceeds to S509 and waits for 10 seconds. If the self mode is not set, the process of S509 is skipped.

Next, in S510, lens drive processing is performed. At this time, the microcomputer 1 controls the lens drive circuit 11 to move the photographing lens to a predetermined position. Next, in step S511, the shutter opening / closing operation is performed, and if it is necessary to use the strobe at the same time, the strobe is driven. That is, at this time, the microcomputer 1 controls the shutter drive circuit 12 to operate the shutter for a predetermined time. This operation time (opening time) is calculated by the process of S503. At this time, the microcomputer 1 also controls the strobe drive circuit 13 to cause the strobe to emit light as necessary.

Although not shown in the flow chart, the charging of the strobe is started after the strobe is emitted, and is stopped when the charging is completed.

Next, in S512, lens restoration processing is executed. That is, at this time, the microcomputer 1 controls the lens driving circuit 11 to return the photographing lens to the original position.

In S513, a date imprinting process is executed. That is, the date imprint switch 28
When a command for imprinting a date (date) is issued by operating the, the microcomputer 1 causes the date data obtained as a result of timing by the built-in clock device (this date data is displayed on the liquid crystal display unit 4). Is output to the date imprinting circuit 10 and imprinted on the film.

In this embodiment, the date is imprinted before the film is wound by one frame, but during the film winding (feeding), for example, a plurality of LEDs (not shown) are used. It is also possible to imprint the date in a dot pattern by illuminating.

Next, in S514, it is determined whether or not the number of frames to be photographed n has reached the final number of frames (n = 37 in the case of this embodiment, since it is a film of 36 frames). To be judged. If it is determined that the final frame has not been reached yet, the flow advances to S515 to execute the film winding process. That is, at this time, the microcomputer 1 controls the feeding circuit 9 to wind the film.

In S516, it is determined whether or not the film has reached the trailing end. If it is determined that the film has not reached the trailing end, the flow proceeds to S517 to determine whether or not the winding of one frame is completed. Is determined. If the winding of one frame has not been completed yet, the process returns to S516, and it is determined whether or not the end has been reached. S516 and S
The microcomputer 1 determines whether or not the film has reached the end and whether or not the winding of one frame is completed in 517 according to the detection result of the film frame feed detection circuit 14. To do.

When the winding of one frame is completed, S51
In step 8, the value of n is incremented by 1. As a result, the number of shooting frames displayed on the liquid crystal display unit 4 (see FIG.
36) will also be incremented.

Next, in S519, the half-press switch 24 is pressed.
Waits until the shutter button is turned off (waits until the release button is released), and when the half-push switch 24 is turned off, the photographing process ends.

When it is determined in step S514 that the last frame has been shot, or in step S516,
When it is determined that the end portion of the film has been reached during the film winding operation, the process proceeds to S520, and the film rewinding process is executed. Then, when the film rewinding process is completed, the photographing process is ended.

Next, the details of the rewinding process subroutine in S520 of FIG. 9 will be described with reference to the flowchart of FIG. This process starts from S601, and the lens barrel is driven to the retracted position in S602.
At this time, the microcomputer 1 controls the lens barrel drive circuit 5 to drive the motor 6 to move the lens barrel to a position where it is sunk into the main body. In S603, it is determined whether or not the lens barrel has reached the retracted position, and when the lens barrel position detection switch 26 is turned on by sinking to a predetermined position (up to the retracted position), the process proceeds to S604. Movement is stopped. That is, the microcomputer 1 controls the lens barrel drive circuit 5 to stop the movement of the lens barrel.

Next, in S605, film rewinding is started. At this time, the microcomputer 1 controls the feeding circuit 9 to rewind the film in the direction of accommodating it in the cartridge. In S606, the number of shot frames is decremented and the value is displayed on the liquid crystal display unit 4. The process of S606 is repeated until it is determined in S607 that the rewinding is completed.

That is, the microcomputer 1 monitors the rewinding state of the film from the output of the film frame advance detection circuit 14, and decrements the value of the number of frames taken by 1 each time the film is rewound by one frame. Then, the number of shot frames is displayed on the liquid crystal display unit 4. When the film is completely accommodated in the cartridge (when the film cannot be wound in the opposite direction), S607
From S to S608, as shown in FIG. 14, the letter E of the alphabet is displayed blinking at the shooting frame number display position. By the above display, the user can know that the rewinding is correctly performed by sequentially decrementing the number of shooting frames by one during the film rewinding operation, and the display is changed to E. You can know that the rewinding of the film is completed.

Next, in S609, a timer for 6 seconds is started. That is, the microcomputer 1 starts the built-in timer and determines whether the back cover switch 29 is turned on in S610 or whether the 6-second timer is up in S611. Back cover switch 29
When is turned on, the back cover (not shown) of the camera body was opened to replace the film, so proceed to S612,
The display on the liquid crystal display unit 4 is switched from the frame number display state (blinking display state of the letter E) shown in FIG. 14 to the date display state shown in FIG.

Even when it is determined in S611 that 6 seconds have elapsed before the back cover switch 29 is turned on, the process proceeds to S612, and this display switching is executed. Then, in S613, the rewinding process ends, and the process returns to the flowchart of FIG.

In the above embodiment, the position of the lens barrel is detected by the lens barrel position detection switch 26, and when the lens barrel is in the extended position, the state mode is set to the operating state mode and the state is set to the depressed position. Although the non-operation mode was set at a certain time, the state mode of the camera is not limited to this. It is also possible to provide a barrier that can be opened and closed, and set the operation mode when the barrier is in a position that allows light to enter the photographing lens, and the non-operation mode when it is in a prohibited position.

Further, an operation switch for operating the power supply on or off is provided, and when the power supply is turned on by operating this operation switch, the state mode is set to the operation mode, and when the power supply is turned off, It is also possible to set the non-operation mode.

When the film is set on the camera,
The present invention can be applied to a prewind type camera in which the film is wound up from the cartridge and the film is rewound by one frame each time one frame is photographed.

[0095]

As described above, according to the camera with date display function of the first aspect, after the rewinding of the film by the rewinding means is started, the display of the display means is switched from the number of photographed frames to the date. Therefore, it is possible to confirm the decrement state of the number of frames taken when the film is rewound and the completion of rewinding.

According to the camera with date display function of the second aspect, the display of the display means is switched from the number of frames to the date when a predetermined time has elapsed after the rewinding of the film is completed. Therefore, it is possible to surely confirm the decrement state of the number of frames taken when the film is rewound and the completion of rewinding.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a camera with a date display function of the present invention.

FIG. 2 is a flowchart illustrating the operation of the embodiment of FIG.

FIG. 3 is a flowchart showing a detailed process of a subroutine of a date initial setting process in S108 of FIG.

FIG. 4 is a main switch (M
It is a flow chart which shows detailed processing of a subroutine of S) processing.

5 is a flash switch (SBS) of S110 of FIG.
8 is a flowchart showing more detailed processing of a processing subroutine.

FIG. 6 is a flowchart following on from FIG.

FIG. 7 shows a mode switch (MO
It is a flow chart which shows detailed processing of a subroutine of S) processing.

FIG. 8 is a flowchart showing more detailed processing of a shooting processing subroutine in S112 of FIG.

9 is a flowchart following FIG.

FIG. 10 is a flowchart showing more detailed processing of a rewinding processing subroutine in S520 of FIG.

11 is a diagram showing an example of date display on the liquid crystal display unit 4 of FIG.

12 is a diagram showing an example of display of the number of captured frames on the liquid crystal display unit 4 of FIG.

13 is a diagram showing an example of a date correction display on the liquid crystal display unit 4 of FIG.

14 is a diagram showing an example of a film rewinding completion display on the liquid crystal display unit 4 of FIG.

15 is a diagram illustrating a display example of strobe mode switching on the liquid crystal display unit 4 of FIG.

16 is a diagram illustrating a display example of date mode switching on the liquid crystal display unit 4 of FIG.

FIG. 17 is a diagram illustrating a display example of shooting mode switching on the liquid crystal display unit 4 of FIG. 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microcomputer 4 Liquid crystal display section 5 Lens barrel drive circuit 7 Photometry circuit 8 Distance measurement circuit 9 Feed circuit 10 Date image pickup circuit 11 Lens drive circuit 12 Shutter drive circuit 13 Strobe drive circuit 14 Film frame advance detection circuit 21 Main switch 22 Strobe switch 23 Mode switch 24 Half-press switch 25 Release switch 26 Lens barrel position detection switch 27 Battery cover switch 28 Date imprinting switch 29 Back cover switch 31 Battery

Claims (2)

[Claims] 1. A display unit for switching and displaying the date or the number of frames photographed on a film of a subject through a photographing lens, a rewinding unit for rewinding the film to a cartridge, and a film for rewinding the film by the rewinding unit. Before rewinding, the display means displays the number of frames taken, and when a signal for rewinding the film is output, the display means is switched from the number of frames taken to the date. A camera with a date display function. 2. The control means switches the display of the display means from the number of photographed frames to the date when a preset predetermined time has elapsed after the rewinding of the film by the rewinding means is completed. The camera with a date display function according to claim 1, wherein the camera has a date display function.