JPH07159876A - Display device - Google Patents

Abstract

PURPOSE:To automatically adjust the original point position of a pointer even at the exchanging time of a battery or the erroneous driving time of the pointer when a setting display and a measurement display are executed on a pointer type display device by controlling the pointer so that it is moved to a reference position based on movement information stored in a storage means when the battery is detected to be exchanged or when the drop of a power source voltage is detected. CONSTITUTION:The storage means 104 storing the angular data of the moving destination of the pointer of the moving pointer type display means 100 is provided. Then, the battery is exchanged in a state where the pointer is stopped at a position other than the original point position. In the case, driving quantity required for returning the pointer of the display means 100 to the original point position is calculated based on the data of the respective pointer positions stored in the storage means 104 by a CPU in a control circuit 105 in response to the case that a signal generated when the power source voltage becomes over the prescribed voltage after the battery is turned on or the turning-on/off of a power source interlocked with the exchanging operation of the battery by a switch is detected by a power source loading detection means 103. Then, the pointer is driven to the original point position by a driving means 101.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device using a pointer.

[0002]

2. Description of the Related Art For example, a timepiece using a step motor as a driving source of a pointer is known. The step motor used in this type of timepiece is small in size, highly reliable, and mass-produced, so that it is inexpensive, and it can be considered to be used as a drive source for a display device other than the timepiece.

In a timepiece having a plurality of hands on the same dial, during operation of the stopwatch function using a plurality of hands, due to battery replacement, driving error of the hands, or the like,
When the origin of the needle position is misaligned, conventionally it has been very troublesome to adjust the origin position (reference position) of each needle by rotating the crown or the like. However, when attempting to reset the set value and the measured value of a certain physical quantity to the origin position after replacing the battery, it is necessary to reduce the size of the parts so that the pointer can be rotated to hit the mechanical limiting member. There is a problem that it is not possible to secure the installation space for such cameras.

An object of the present invention is to provide a display device for automatically adjusting the origin position of the needle when the setting display and the weighing display are displayed on the pointer type display device even when the battery is replaced and the needle drive processing error occurs. To do.

[0005]

The present invention will be described with reference to FIG. 1, which is a claim correspondence diagram, and a display means 100 for displaying a physical quantity by a pointer moving on a scale plate and a driving means 101 for driving the pointer. An operation means 102 for changing the display of the display means 100, a power supply loading detection means 103 for detecting battery replacement or a drop in the power supply voltage, a storage means 104 for storing the moving position of the pointer, and a movement of the pointer. The control means 105 for calculating the above data and generating a pointer drive signal is provided, thereby achieving the above object.

[0006]

When the battery is replaced while the storage means 104 for storing the angle data of the needle movement destination of the movement pointer type display means 100 is provided and the needle is stopped at a position other than the origin position,
The storage means 104 responds when the power supply loading detection means 103 detects a signal generated when the power supply voltage exceeds a predetermined voltage when the battery is turned on, or a battery power output by a switch linked to the battery replacement operation. The CPU in the control circuit 105 calculates the drive amount for returning the pointer of the display means 100 to the origin position on the basis of the data of each pointer position stored in, and the driving means 101 drives it to the origin position. You can

[0007]

FIG. 2 is a top view of a camera equipped with a display device according to an embodiment. A photographic lens barrel 2 is attached to the camera body 1. A release button 3, a mode selector 4, a command dial 5, an AF mode button 6, an exposure correction mode button 7, a display 8 and the like are provided on the upper surface.

The mode selector 4 is a program automatic exposure mode P (hereinafter referred to as P-AE mode) for automatically setting exposure according to a preset program diagram,
It is a selector for selecting the automatic exposure mode A with priority on the aperture, the time mode T, and the stop mode OFF of various operations of the camera. Command dial 5 is for aperture, exposure compensation value,
It is a dial that switches the shutter speed. AF
If you turn the command dial 5 while pressing the mode button 6, the automatic focus adjustment mode (hereinafter referred to as AF mode)
Then, it is possible to set the shooting distance from the infinity position ∞ to the closest position of 0.4 m in the manual focus adjustment mode (hereinafter, referred to as MF mode). If you turn the command dial 5 while pressing the exposure compensation mode button 7, +2
The exposure correction value can be set within the range of --2. The display unit 8 includes four rotation pointer type display units, that is, a shooting frame number display unit, an exposure correction display unit, a shooting distance display unit, and a diaphragm display unit.

FIG. 3 shows the configuration of one embodiment. 10 is a microcomputer and a non-volatile memory (EEPRO
M) It is composed of peripheral parts such as 10 m and performs sequence control of the camera and various calculations, and executes a control program described later to perform display control. 3a and 3b are switches that are turned on / off in conjunction with the release button 3, and 3a is turned on when the release button 3 is half-pressed, and 3b.
Is turned on when fully pressed. 4p, 4a, and 4t are switches that are turned on / off in conjunction with the mode selector 4.
p turns on when the mode selector 4 is set to the P position, and
The a turns on when the A position is set, and the 4t turns on when the T position is set. 6a is a switch that is turned on when the AF mode button 6 is pressed, 7a is a switch that is turned on when the exposure compensation mode button 7 is pressed, and 11 is a switch that is turned on when the battery chamber cover is opened. These switches are connected to the control circuit 10.

The control circuit 10 is also connected to a pulse generator 5a for generating a pulse corresponding to the rotation direction when the command dial 5 is turned, and a drive circuit 14 for driving the film feeding motor 14M. Further, in the control circuit 10,
Step motors 15M to 18M that rotate and drive the hands of the four display portions of the display unit 8 and their drive circuits 15 to 1
8 are connected. The step motor 15M rotationally drives the pointer of the photographing frame number display section, and the step motor 16M rotationally drives the pointer of the exposure correction display section. Further, the step motor 17M rotationally drives the pointer of the photographing distance display section, and the step motor 18M rotationally drives the pointer of the aperture display section. The distance measuring device 19 detects the shooting distance to the subject and outputs the distance measuring value to the control circuit 10. Furthermore, the photometric device 20
Detects subject brightness and outputs a photometric value to the control circuit 10.

Further, when the battery is turned on at the time of battery replacement, a signal generated when the power supply voltage exceeds a predetermined voltage or a signal generated when a battery loading output by a switch linked to the battery replacement operation is detected is output. The battery replacement detection means 21 is connected. In addition, the control circuit 10 to the drive circuit 1
When the drive signal is transmitted to 4 to 18, the transmission completion signal A of the transmission signal or the drive completion signal B of the needle is transmitted to the drive circuits 14 to 18
Output to the control circuit 10.

FIG. 4 is an enlarged view of the display 8. The number-of-photographed frames display unit 31 is composed of a pointer 32, a scale plate 33, and a numerical value 34 indicating a typical number of frames, and displays the number of frames photographed on the film. Reference numeral 35 is a rotating shaft of the pointer 32. Control circuit 10
Every time the film is fed by the film feeding motor 14M, the step motor 15 is moved according to the feeding amount.
The pointer 32 is rotationally driven by M and the memory 10
The current drive amount is added to the previous drive amount θ1 stored in m to obtain the drive amount θ1 of the pointer 32 as the memory 10 m.
Remember.

The exposure correction display section 41 includes a pointer 42 and a scale plate 4.
3 and a numerical value 44 indicating the exposure correction value, and displays the exposure correction value. Reference numeral 45 is a rotating shaft of the pointer 42. The tip 42a of the pointer 42 is formed in an arc shape centering on the rotation shaft 45. The control circuit 10 receives a pulse signal from the pulse generator 5a when the switch 7a is on,
The pointer 42 is rotationally driven by the step motor 16M according to the number of input pulses and the polarity indicating the rotational direction. That is,
It is rotated by one scale (about 18 degrees) for one input pulse. At the same time, the current drive amount is added to the previous drive amount θ2 stored in the memory 10m and is stored in the memory 10m as the drive amount θ2 of the pointer 42.

The photographing distance display section 51 includes a pointer 52 and a scale plate 5.
3. Numerical values and symbols indicating typical distances and AF modes 5
It consists of 4 and displays the shooting distance. 55 is a rotating shaft of the pointer 52. The symbol ∞ indicates infinity. Control circuit 1
0 is the pulse generator 5 when the switch 6a is on.
When the pulse signal is input from a, the pointer 52 is rotationally driven by the step motor 17M according to the number of input pulses and the polarity indicating the rotation direction. That is, one input pulse is rotated by one scale. For example, from AF mode to MF
To change the mode to the infinity position ∞, when the command dial 5 is rotated by one pulse while pressing the AF mode button 6, the pointer 52 rotates from the AF position to the infinity ∞ position. The control circuit 10 also rotationally drives the pointer 52, and at the same time, adds the current drive amount to the previous drive amount θ3 stored in the memory 10m to obtain the drive amount θ3 of the pointer 52.
Is stored in the memory 10m.

On the other hand, when the pointer 52 is at the AF position, that is, when the AF mode is set, when the release button 3 is pressed halfway and the switch 3a is turned on, the control circuit 10 detects the distance measuring device 19. The pointer 52 is rotationally driven to the position of the photographing distance. For example, when the distance measuring device 19 detects a shooting distance of 1 m, the pointer 52 is rotated to a scale of 1 m as shown in FIG.

The aperture display section 61 includes a pointer 62, a scale plate 63,
It is composed of numerical values / symbols 64 indicating the aperture value and the P-AE mode, and displays the aperture value. Reference numeral 65 is a rotating shaft of the pointer 62. When the pulse signal is input from the pulse generator 5a while the switch 4a is on, the control circuit 10 rotationally drives the pointer 62 by the step motor 18M according to the number of input pulses and the polarity indicating the rotation direction. That is, one input pulse is rotated by one scale. For example, from program automatic exposure mode P to aperture priority automatic exposure mode A
When the exposure mode is changed to set the aperture F22, the pointer 62 rotates from the P position to the 22 position when the mode selector 4 is set to the A position and the command dial 5 is rotated by one pulse. The control circuit 10 also has a pointer 62.
Simultaneously with the rotation of, the current drive amount is added to the previous drive amount θ4 stored in the memory 10m, and the pointer 62
It is stored in the memory 10m as the drive amount θ4 of.

On the other hand, when the mode selector 4 is at the P position, that is, when the program automatic exposure mode P is set, when the release button 3 is pressed halfway and the switch 3a is turned on, the control circuit 10 is operated by the photometric device 20. A diaphragm is obtained based on the detected subject brightness and a program diagram stored in advance on a scale 10 m,
The pointer 62 is rotationally driven to the aperture value. For example, if the diaphragm F5.6 is obtained based on the subject brightness detected by the photometric device 20 and the program diagram, FIG.
The pointer 62 is rotated to the scale of 5.6 as shown in FIG.

FIG. 6 is a flow chart showing the processing routine of the manual focus adjustment mode. The microcomputer of the control circuit 10 starts execution of this processing routine when the AF mode button 6 is operated and the switch 6a is turned on. In step S4, it is determined whether or not a pulse signal is input from the pulse generator 5a, and if a pulse signal is input, the process proceeds to step S5, and if not, the execution of the program ends. As mentioned above, the pulse generator 5
A outputs a pulse signal according to the rotation amount and the rotation direction of the command dial 5. In step S5, pointer position data for rotationally driving the pointer 52 is calculated according to the input pulse signal from the pulse generator 5a, step S6 pointer position data is created, and this driving signal is output in step S7. Then, the drive position data signal is sent from the control circuit 10 to the drive circuits 14-18. After transmitting the drive position data signal, it is confirmed in step S8 whether the drive circuit has correctly received the data. At this time, the communication completion signal A is 100
If not input within ms, it is determined that the transmission of the needle drive data has been interrupted by the interruption of another switch signal or the like to the control circuit, and the process returns to step S7 to transmit the position data again. At this time, although not described in the example,
If the transmission of the position data is not successful even if it is tried several times, the processing is ended once and the input of the next switch is waited. On the other hand, when the communication completion signal A is received, steps S11 and S12
Then, the stepping motor is driven to drive the pointer 52. At this time, when the driving of the pointer is completed in step S13, the pointer drive completion signal B is input from the drive circuits 14 to 18 to the control circuit 10, and the data of the movement destination of the pointer 52 is stored in the memory 10m in step S16. An E2PROM or the like is used as this storage means, and the data of the needle position can be held even when the battery is removed, and it is constructed on a separate IC or the same IC as the microcomputer. On the other hand, if the pointer drive completion signal B is not input within 100 ms, it is determined that the operation of the needle drive has been interrupted by the interruption of another switch signal or the like to the control circuit 10, and the updating of the position data of the pointer movement destination is prohibited. , And returns to step S2 to wait for the next switch input.

FIG. 7 is a flow chart showing the processing routine of the aperture priority automatic exposure mode. The microcomputer of the control circuit 10 starts execution of this processing routine when the AF mode button 6 is operated and the switch 6a is turned on. In step S24, the pulse generator 5
It is determined whether or not the pulse signal is input from a, and if the pulse signal is input, the process proceeds to step S25, and if not, the execution of the program ends. As described above, the pulse generator 5a outputs a pulse signal according to the rotation amount and the rotation direction of the command dial 5. In step S25, the pointer 6 is responsive to the input pulse signal from the pulse generator 5a.
The pointer position data for rotationally driving 2 is calculated, and the pointer position data is created in step S26.
At 7, the drive signal is output and the drive position data signal is sent from the control circuit 10 to the drive circuits 14-18. After transmitting the drive signal, it is confirmed in step S28 whether the drive circuit has correctly received the data. At this time, if the communication completion signal A is not input within 100 ms, the control circuit is interrupted by another switch signal or the like. Thus, it is determined that the transmission of the needle drive data has been interrupted, and the process returns to step S27 and the transmission of the position data is performed again. At this time, although not described in the embodiment, if the transmission of the position data is not successful even if the transmission of the position data is tried several times, the processing is ended once and the input of the next switch is waited.
On the other hand, when the communication completion signal A is received, step S3
Proceed to steps 1 and 32 to drive the stepping motor and
To drive. At this time, when the driving of the pointer is completed in step S33, the pointer drive completion signal B is input from the drive circuits 14 to 18 to the control circuit 10.
The data of the moving destination of is stored in the memory 10m. On the other hand, if the pointer drive completion signal B is not input within 100 ms, it is determined that the operation of the needle drive has been interrupted by the interruption of another switch signal or the like to the control circuit 10, and the updating of the position data of the pointer movement destination is prohibited. , Return to step S22,
Wait for next switch input. On the other hand, when the driving of the aperture pointer is completed, the aperture setting value in the aperture priority automatic exposure mode is displayed on the aperture display section 61.

8 and 9 are flowcharts showing the release routine. The microcomputer of the control circuit 10 starts the execution of this routine when the release button 3 is half pressed and the switch 3a is turned on in step S101. In step S102, the shooting distance display unit 51
It is determined whether the pointer 52 is in the AF position and the AF mode is set. If the AF mode is set, the process proceeds to step S103. If not, it is determined that the MF mode is set and the process proceeds to step S105. move on. If the AF mode is set, the distance measuring device 19 is operated in step S103.
The shooting distance is detected by, the distance pointer position is calculated in step S104, and the process proceeds to step 106. If the MF mode is set, the processing routine of the manual focus adjustment mode of FIG. 6 has already been executed, and the command dial 5
It is assumed that the taking lens is driven to a position corresponding to the set value of the taking distance manually set by. Next, in step S106, the lens extension amount is calculated based on the distance measurement result of the distance measuring device.

In step S107, the brightness of the subject is detected by the photometric device 20, exposure calculation is performed in step S108, the process proceeds to step S109, and the mode selector 4 determines whether or not the P-AE mode is set. When the switch 4p is on and the P-AE mode is set, the process proceeds to step S114, and the photometric device 2
Exposure calculation is performed based on the subject brightness detected by 0 and a preset program diagram, the shutter speed is read in step S114, and the aperture value is calculated in step S115, and the process proceeds to step S116.

If it is determined in step S109 that the P-AE mode is not set, the switch 4p is off, and the flow advances to step S110 to set the aperture priority automatic exposure mode A or time mode T. Judge,
By the data written in the ROM in the control circuit,
In order to execute the processing routine of the aperture priority automatic exposure mode or the time mode, the aperture value is read out, and step S111
Go to. In step 111, if the switch 4a is on, it is determined to be the aperture priority exposure mode, and step S11
2, the shutter speed is calculated from the subject brightness detected by the photometric device 20, and the process proceeds to step S113. If the switch 4t is turned on in step S111, the time mode T is determined, and the process proceeds to step S113. In the time mode T, a time mode process (not shown) is executed, the shutter curtain opens when the switch 3b is turned on by fully pressing the release button, and the shutter curtain is closed by executing the next full press again. Exposure is possible. In step S113, since the aperture needle has already been set during the manual aperture setting operation described above with reference to FIG. 7, it is determined here not to drive the aperture needle, and the process proceeds to step S116.

In step S116, the data of the driving destination position of each pointer is created, and the distance pointer 52 in the P-AE mode.
And the aperture pointer 62 are set so that only the distance pointer 52 is driven in the aperture priority exposure mode and the time mode. However, if the MF mode is determined in step S102, the distance pointer 52 has already moved to the position set during the manual distance setting operation shown in FIG. 6, so the needle operation is prohibited here. In the next step S117, a drive signal for moving each needle is transmitted from the control circuit 10 to the drive circuits 14 to 18, and the process proceeds to step 118.

In step S118, it is confirmed whether the drive circuit has correctly received the data after transmitting the drive signal. At this time, if the communication completion signal is not input within 100 ms, another switch is added to the control circuit 10. It is determined that the needle drive data communication has been interrupted due to an interruption of a signal or the like or the occurrence of noise or the like, and the process returns to step S118 and the position data is transmitted again. At this time, although not described in the embodiment, if the transmission of the position data is not successful even if the transmission of the position data is tried several times, the process is ended once, and the process proceeds to step S120 of FIG. On the other hand, when the communication completion signal A is received, the process proceeds to steps S120 and S121 in FIG. 9, the stepping motor is driven, the pointer 52 is rotationally driven to the shooting distance calculated in step S104, and the shooting distance display unit 51 shoots. The measured value of the distance is displayed, and in step S115, the pointer 62 is rotationally driven to the calculated aperture value, and P-displays on the aperture display unit 61.
Display the aperture measurement value in AE mode
Proceed to 122. When the driving of the pointer is completed in step S122, the pointer drive completion signal B is input from the drive circuits 14 to 18 to the control circuit 10, and the pointer 52 is input in step S124.
And the data of the movement destination of the pointer 62 is stored in the memory 10m. E2PROM is used for this storage means, and the data of the needle position can be held even when the battery is removed.
It is configured on a separate IC or the same IC as the microcomputer. On the other hand, if the pointer drive completion signal is not input within 100 ms, it is determined that the operation of the needle drive has been interrupted by the interruption of another switch signal or the like in the control circuit, and the updating of the position data of the pointer movement destination is prohibited. S12
Go to 5.

In step S125, the photographic lens motor and motor drive circuit (not shown) are controlled to drive the photographic lens to a position corresponding to the photographic distance detected by the distance measuring device 19 in step S106, and in step S126.
Go to. In step S126, the release button 3
Is fully pressed to determine whether the switch 3b is turned on. If the release button 3 is fully pressed, the process proceeds to step S129, and if not, the execution of the program ends. In step S129, a photographing operation is performed by a shutter control unit, an aperture control unit, and the like (not shown), and in subsequent step S130, the drive circuit 14 is controlled to wind the film by the film feeding motor 14M.

10 and 11 are flow charts showing the battery loading operation process. When the battery is loaded in step S201, the microcomputer of the control circuit 10 starts executing the battery loading processing routine. Step S20
In 2, it is confirmed that the switch 11 is switched from on to off when the battery chamber is closed, and when it is turned on, step S2 is performed.
03, the voltage detector 21 determines whether or not the control device 10 has reached an operable voltage. If the voltage is sufficient, the microcomputer in the control circuit 10 is released from the reset state, Proceed to S206. In step S202, the reset state of the control circuit 10 is maintained while the output of the switch 11 is on. Also,
If it is determined in step S203 that the output of the voltage detector is insufficient, the process ends there.

When the reset release processing of the control circuit 10 is completed, in step S206, E2 PRO is set before the battery is loaded.
The control device 10 reads the stored pointer position data A, proceeds to step S207, calculates a drive position data signal for driving the pointer position to the origin position, and proceeds to step S208. Here, the origin position of each needle is
The shooting frame table pointer is a position indicating 0 frame, the aperture display pointer is a position indicating P, the AF display pointer is a position indicating AF, and the exposure correction display pointer is a position indicating a correction amount of 0.

In step S208, a drive position data signal is output, the drive position data signal is sent from the control circuit 10 to the drive circuits 14 to 18, and in step S209, the drive position data signal is transmitted and then the drive circuit correctly outputs the data. It is confirmed that the communication completion signal A is 10 at this time.
If the input is not made within 0 ms, it is determined that the transmission of the needle drive data has been interrupted by the interruption of another switch signal or the like to the control circuit, and the process returns to step S208 to transmit the position data again. At this time, although not described in the embodiment, if the transmission of the position data is not successful even if it is tried several times, the process may be ended once and the battery loading process may be forcibly ended. On the other hand, when the communication completion signal A is received, the process proceeds to steps S211, S212 to drive the stepping motor and drive the hands 32, 42, 52, 62. At this time, when the driving of the pointers is completed in step S213, the pointer drive completion signal B is input from the drive circuits 14 to 18 to the control circuit 10, and the pointers 32 and 4 are input in step S215.
The destination data of 2, 52, and 62 are stored in the memory 10m, and the process proceeds to step S216. On the other hand, pointer drive completion signal B
Is not input within 100 ms, the control circuit 10
It is determined that the needle driving operation has been interrupted by interruption of another switch signal or the like, updating of the position data of the pointer movement destination is prohibited, and the process returns to step S208 to retransmit the position data. In step S216, calculation for driving each pointer is performed based on the position data A indicated by the pointer before the battery is removed. Here, the origin position of each needle is determined by, for example, the shooting frame display pointer 32 to the position of the pointer position data A, the aperture display pointer 62 according to the current position of the mode selector 4, and the P-AE mode.
Position, to the position indicating the latest diaphragm setting position stored in the pointer position data A in the A and T modes, the AF display pointer 52 to the position indicating AF, and the exposure correction display pointer 32 to the position indicating the correction amount 0. is there. When the pointer driving calculation is completed, the same processing as the contents described in steps S208 to S215 is performed, and steps S217 to S224 are performed.
Then, the driving of each pointer and the storage update of the position data are executed, and the battery loading operation processing is ended.

As described above, when the battery of the camera is replaced,
When the camera information is displayed using a plurality of pointer displays, when the output signal of the battery switch 11 and the output signal of the voltage detector 21 generated when the battery is loaded are obtained, the respective display pointers 31, 41, 51, The position of 61 can be automatically reset to the origin position, and depending on the display content, it is possible to return to the position displayed before the battery was removed.

Although the present invention is applied to the display unit of the camera in the above embodiment, the present invention is not limited to the display unit of the camera. For example, a watch with a chronograph function,
It can also be applied to the instruments of automobiles, and when the battery is replaced or fails, the rotary pointer can be automatically returned to the origin position or the display position before the battery replacement. In the configuration of the above embodiment,
The shooting frame number display unit 31, the exposure correction display unit 41, the shooting distance display unit 51, and the aperture display unit 61 form the display unit 100,
The drive circuits 14, 15, 16, 17, 18 and the step motors 14M, 15M, 16M, 17M, 18M constitute the drive means 101, the mode selector 4, the AF mode button 6 and the command dial 5 constitute the operation means 102, and the control circuit 10 Is the control means 105, the switch 11 and the voltage detector 21 are the power supply loading detection means 103, and the memory 10
m constitutes the pointer position storage means 104, respectively.

As described above, the switch signal and the voltage detector of the voltage detector generated when the battery is reloaded even after the battery is replaced in the state where the photographing information and the setting information of the camera are displayed by the rotation pointer. In response to the detection, the pointer position can be automatically reset to the origin position, and depending on the display content, it is possible to return to the position that was displayed before the battery was removed, making it difficult for the camera user to display the pointer. It is not necessary to align the pointers. Also, without adding a mechanical limiting member when returning the pointer to the origin position,
It is possible to downsize the camera.

[0032]

According to the present invention, the pointer is moved by the driving means in response to the operation of the operating means, the movement information of the pointer is stored in the storage means, and the power source detecting means replaces the battery or lowers the power source voltage. When is detected, the drive means controls the movement of the pointer to the reference position based on the movement information stored in the storage means, so that it is not necessary to perform the troublesome position adjustment of the pointer display.

[Brief description of drawings]

FIG. 1 is a claim correspondence diagram.

FIG. 2 is a top view of a camera including a display device according to an embodiment.

FIG. 3 is a block diagram showing a configuration of an embodiment.

FIG. 4 is an enlarged view of a display device according to an embodiment.

FIG. 5 is a diagram showing a display example of a display device according to an embodiment.

FIG. 6 is a flowchart showing a processing routine of a manual focus adjustment mode.

FIG. 7 is a flowchart showing a processing routine of an aperture priority automatic exposure mode.

FIG. 8 is a flowchart showing a release routine.

FIG. 9 is a flowchart showing a release routine.

FIG. 10 is a flowchart showing a battery loading operation routine.

FIG. 11 is a flowchart showing a battery loading operation routine.

[Explanation of symbols]

 1 camera body 2 taking lens barrel 3 release button 3a, 3b switch 4 mode selector 4p, 4a, 4t switch 5 command dial 5a pulse generator 6 AF mode button 6a switch 7 exposure compensation mode button 7a switch 8 indicator 10 control circuit 10m memory 11 battery cover switch 14-18 drive circuit 14M film feeding motor 15M-18M step motor 19 distance measuring device 20 photometric device 21 voltage detector 31 frame number display section 32, 42, 52, 62 pointer 33, 43, 53 , 63 Scale plate 34, 44 Numerical value 35, 45, 55, 65 Rotating shaft 54, 64 Numerical value / symbol 100, 100A, 100B Display means 101 Driving means 102 Operating means 103 Battery loading detecting means 104 Storage means 105 Control means

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Daiki Tsukahara 3 2-3 Marunouchi, Chiyoda-ku, Tokyo Inside Nikon Corporation

Claims (3)

[Claims] 1. A display unit for displaying a physical quantity by a pointer moving on a scale plate, a display driving unit for driving the pointer, an operating unit for changing a display value of the display driving unit, a battery replacement or A power source detecting unit that detects a decrease in the power source voltage, the pointer is moved by the driving unit according to the operation of the operating unit, and movement information of the pointer is stored in the storage unit, and the power source detecting unit, And a control means for controlling movement of the pointer to the reference position by the driving means on the basis of movement information stored in the storage means when battery replacement or a decrease in power supply voltage is detected. Display device. 2. A display means for displaying a physical quantity by a pointer moving on a scale plate, a display driving means for driving the pointer, an operating means for changing a display value of the display driving means, a battery replacement or A power source detecting unit that detects a decrease in the power source voltage, the pointer is moved by the driving unit according to the operation of the operating unit, and movement information of the pointer is stored in the storage unit, and the power source detecting unit, When battery replacement or a drop in power supply voltage is detected, the drive means controls the movement of the pointer to a position corresponding to the stored movement information based on the rotation amount stored in the storage means. A display device comprising: 3. A display means for displaying a physical quantity by a pointer moving on a scale plate, a display driving means for driving the pointer, an operating means for changing a display value of the display driving means, a battery replacement or A power source detecting unit that detects a decrease in the power source voltage, the pointer is moved by the driving unit according to the operation of the operating unit, and movement information of the pointer is stored in the storage unit, and the power source detecting unit, When battery replacement or a drop in the power supply voltage is detected, the drive means controls the movement of the pointer to a predetermined reference position based on the movement information stored in the storage means, and then the drive means. And a control means for controlling movement to a position corresponding to the stored movement information.